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LM1086

SNVS039J –JUNE 2000–REVISED APRIL 2015

LM1086 1.5-A Low Dropout Positive Regulators

1 Features 3 Description

The LM1086 is a regulator with a maximum dropout

1• Available in 1.8-V, 2.5-V, 3.3-V, 5-V and of 1.5 V at 1.5 A of load current. The device has the

Adjustable Versions same pin-out as TI's industry standard LM317.

• Current Limiting and Thermal Protection Two resistors are required to set the output voltage of

• Output Current 1.5 A the adjustable output voltage version of the LM1086.

• Line Regulation 0.015% (Typical) Fixed output voltage versions integrate the adjust

• Load Regulation 0.1% (Typical) resistors.

The LM1086 circuit includes a zener trimmed

2 Applications bandgap reference, current limiting, and thermal

shutdown.

• High-Efficiency Linear Regulators

• Battery Chargers Refer to LM1084 for the 5-A version, and the LM1085

for the 3-A version.

• Post Regulation for Switching Supplies

• Constant Current Regulators Device Information(1)

• Microprocessor Supplies PART NUMBER PACKAGE BODY SIZE (NOM)

WSON (8) 4 mm × 4 mm

LM1086 DDPAK/TO-263 (3) 10.18 mm × 8.41 mm

TO-220 (3) 14.986 mm × 10.16 mm

(1) For all available packages, see the orderable addendum at

the end of the datasheet.

Typical Application

An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,

intellectual property matters and other important disclaimers. PRODUCTION DATA.

LM1086

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Table of Contents

7.4 Device Functional Modes........................................ 11

1 Features.................................................................. 18 Application and Implementation ........................ 13

2 Applications ........................................................... 18.1 Application Information............................................ 13

3 Description............................................................. 18.2 Typical Applications ................................................ 13

4 Revision History..................................................... 29 Power Supply Recommendations...................... 18

5 Pin Configuration and Functions......................... 310 Layout................................................................... 18

6 Specifications......................................................... 410.1 Layout Guidelines ................................................. 18

6.1 Absolute Maximum Ratings ...................................... 410.2 Layout Example .................................................... 18

6.2 ESD Ratings ............................................................ 410.3 Thermal Considerations........................................ 19

6.3 Recommended Operating Conditions....................... 411 Device and Documentation Support................. 21

6.4 Thermal Information.................................................. 511.1 Development Support ........................................... 21

6.5 Electrical Characteristics........................................... 511.2 Trademarks........................................................... 21

6.6 Typical Characteristics.............................................. 711.3 Electrostatic Discharge Caution............................ 21

7 Detailed Description.............................................. 911.4 Glossary................................................................ 21

7.1 Overview................................................................... 912 Mechanical, Packaging, and Orderable

7.2 Functional Block Diagram......................................... 9Information ........................................................... 21

7.3 Feature Description................................................. 10

4 Revision History

Changes from Revision I (August 2014) to Revision J Page

• Added 8-pin WSON pinout drawing and associated device information................................................................................ 3

Changes from Revision H (May 2013) to Revision I Page

• Added ESD Ratings table, Feature Description section, Device Functional Modes,Application and Implementation

section, Power Supply Recommendations section, Layout section, Device and Documentation Support section, and

Mechanical, Packaging, and Orderable Information section ................................................................................................. 4

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VIN

N/C

VOUT

ADJ/GND

N/C

VOUT

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5 Pin Configuration and Functions

8-Pin WSON

Package NGN

Top View

3-Pin TO-220

Package NDE

Top View

3-Pin DDPAK/TO-263

Package KTT

Top View

Pin Functions

NUMBER I/O DESCRIPTION

NAME KTT/NDE NGN

Adjust pin for the adjustable output voltage version. Ground pin for the fixed

ADJ/GND 1 1 –– output voltage versions.

VOUT 2, TAB 6, 7, 8, PAD O Output voltage pin for the regulator.

VIN 3 2 I Input voltage pin for the regulator.

N/C 3, 4, 5 –– No Connection

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6 Specifications

6.1 Absolute Maximum Ratings

over operating free-air temperature range (unless otherwise noted) (1)(2)

MIN MAX UNIT

LM1086-ADJ 29 V

LM1086-1.8 27 V

Maximum Input to Output Voltage Differential LM1086-2.5 27 V

LM1086-3.3 27 V

LM1086-5.0 25 V

Power Dissipation(3) Internally Limited

Junction Temperature (TJ)(4) 150 °C

Lead Temperature 260, to 10 sec °C

Storage temperature, Tstg –65 150 °C

(1) Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings

only, which do not imply functional operation of the device at these or any other conditions beyond those indicated under Recommended

Operating Conditions. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.

(2) If Military/Aerospace specified devices are required, please contact the Texas Instruments Sales Office/Distributors for availability and

specifications.

(3) Power dissipation is kept in a safe range by current limiting circuitry. Refer to Overload Recovery in Application and Implementation. The

value θJA for the WSON package is specifically dependent on PCB trace area, trace material, and the number of thermal vias. For

improved thermal resistance and power dissipation for the WSON package, refer to Application Note AN-1187 (literature number

SNOA401).

(4) The maximum power dissipation is a function of TJ(MAX) ,θJA, and TA. The maximum allowable power dissipation at any ambient

temperature is PD= (TJ(MAX)–T A)/θJA. All numbers apply for packages soldered directly into a PC board. Refer to Thermal

Considerations

6.2 ESD Ratings VALUE UNIT

V(ESD) Electrostatic discharge Human-body model (HBM), per ANSI/ESDA/JEDEC JS-001(1) ±2000 V

(1) JEDEC document JEP155 states that 500-V HBM allows safe manufacturing with a standard ESD control process.

6.3 Recommended Operating Conditions MIN MAX UNIT

JUNCTION TEMPERATURE RANGE (TJ)(1)

Control Section 0 125 °C

"C" Grade Output Section 0 150 °C

Control Section −40 125 °C

"I" Grade Output Section −40 150 °C

(1) The maximum power dissipation is a function of TJ(MAX) ,θJA, and TA. The maximum allowable power dissipation at any ambient

temperature is PD= (TJ(MAX)–T A)/θJA. All numbers apply for packages soldered directly into a PC board. Refer to Thermal

Considerations.

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6.4 Thermal Information LM1086

THERMAL METRIC(1) KTT NDE NGN UNIT

3 PINS 3 PINS 8 PINS

RθJA Junction-to-ambient thermal resistance 40.8 23.0 35.9

RθJC(top) Junction-to-case (top) thermal resistance 42.3 16.1 24.2

RθJB Junction-to-board thermal resistance 23.3 4.5 13.2 °C/W

ψJT Junction-to-top characterization parameter 10.2 2.4 0.2

ψJB Junction-to-board characterization parameter 22.3 2.5 13.3

RθJC(bot) Junction-to-case (bottom) thermal resistance: Control 1.5/4.0 1.5/4.0 2.9

Section/Output Section

(1) For more information about traditional and new thermal metrics, see the IC Package Thermal Metrics application report, SPRA953.

6.5 Electrical Characteristics

Typicals and limits appearing in normal type apply for TJ= 25°C unless specified otherwise.

TJover the entire range for

operation (see

TJ= 25°C Recommended Operating

PARAMETER TEST CONDITIONS UNIT

Conditions)

MIN TYP MAX MIN(1) TYP(2) MAX (1)

LM1086-ADJ, IOUT = 10 mA,

Reference VIN −VOUT = 3 V, 10 mA ≤

VREF 1.238 1.250 1.262 1.225 1.250 1.270 V

Voltage IOUT ≤IFULL LOAD, 1.5 V ≤VIN

−VOUT ≤15 V(3)

VOUT Output Voltage(3) LM1086-1.8, IOUT = 0 mA, VIN

= 5 V, 0 ≤IOUT ≤IFULL LOAD, 1.782 1.8 1.818 1.764 1.8 1.836 V

3.3 V ≤VIN ≤18 V

LM1086-2.5, IOUT = 0 mA, VIN

= 5 V, 0 ≤IOUT ≤IFULL LOAD, 2.475 2.50 2.525 2.450 2.50 2.55 V

4.0 V ≤VIN ≤18 V

LM1086-3.3, IOUT = 0 mA, VIN

= 5 V, 0 ≤IOUT ≤IFULL LOAD, 3.267 3.300 3.333 3.235 3.300 3.365 V

4.75 V ≤VIN ≤18 V

LM1086-5.0, IOUT = 0 mA, VIN

= 8 V, 0 ≤IOUT ≤IFULL LOAD, 4.950 5.000 5.050 4.900 5.000 5.100 V

6.5 V ≤VIN ≤20 V

LM1086-ADJ, IOUT =10 mA, 0.015% 0.2% 0.035% 0.2%

1.5 V ≤(VIN - VOUT)≤15 V

LM1086-1.8, IOUT = 0 mA, 3.3 0.3 6 0.6 6 mV

V≤VIN ≤18 V

Line LM1086-2.5, IOUT = 0 mA, 4.0

ΔVOUT 0.3 6 0.6 6 mV

Regulation(4) V≤VIN ≤18 V

LM1086-3.3, IOUT = 0 mA, 4.5 0.5 10 1.0 10 mV

V≤VIN ≤18 V

LM1086-5.0, IOUT = 0 mA, 6.5 0.5 10 1.0 10 mV

V≤VIN ≤20 V

(1) All limits are specified by testing or statistical analysis.

(2) Typical Values represent the most likely parametric norm.

(3) IFULL LOAD is defined in the current limit curves. The IFULL LOAD Curve defines current limit as a function of input-to-output voltage. Note

that 15W power dissipation for the LM1086 is only achievable over a limited range of input-to-output voltage.

(4) Load and line regulation are measured at constant junction temperature, and are specified up to the maximum power dissipation of

15W. Power dissipation is determined by the input/output differential and the output current. Ensured maximum power dissipation will

not be available over the full input/output range.

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Electrical Characteristics (continued)

Typicals and limits appearing in normal type apply for TJ= 25°C unless specified otherwise.

TJover the entire range for

operation (see

TJ= 25°C Recommended Operating

PARAMETER TEST CONDITIONS UNIT

Conditions)

MIN TYP MAX MIN(1) TYP(2) MAX (1)

LM1086-ADJ, (VIN-V OUT )=3 0.1% 0.3% 0.2% 0.4%

V, 10 mA ≤IOUT ≤IFULL LOAD

LM1086-1.8, 2.5, VIN = 5 V, 0 3 12 6 20 mV

≤IOUT ≤IFULL LOAD

Load

ΔVOUT Regulation(4) LM1086-3.3, VIN = 5 V, 0 ≤3 15 7 25 mV

IOUT ≤IFULL LOAD

LM1086-5.0, VIN = 8 V, 0 ≤5 20 10 35 mV

IOUT ≤IFULL LOAD

LM1086-ADJ, 1.8, 2.5, 3.3, 5,

Dropout ΔVREF,ΔVOUT = 1%, IOUT = 1.3 1.5 V

Voltage(5) 1.5A

LM1086-ADJ, VIN −VOUT = 5 1.50 2.7 A

V, VIN −VOUT = 25 V 0.05 0.15

ILIMIT Current Limit LM1086-1.8,2.5, 3.3, VIN = 8 1.5 2.7 A

LM1086-5.0, VIN = 10 V 1.5 2.7 A

Minimum Load LM1086-ADJ, VIN −VOUT = 25 5.0 10.0 mA

Current(6) V

LM1086-1.8, 2.5, VIN ≤18 V 5.0 10.0 mA

Quiescent LM1086-3.3, VIN ≤18 V 5.0 10.0 mA

Current LM1086-5.0, VIN ≤20 V 5.0 10.0 mA

Thermal TA= 25°C, 30ms Pulse 0.008 0.04 %/W

Regulation fRIPPLE = 120 Hz, COUT = 25

µF Tantalum, IOUT = 1.5 A dB

LM1086-ADJ, CADJ = 25 µF,

(VIN−VO) = 3 V 60 75

Ripple Rejection LM1086-1.8, 2.5, VIN = 6 V 60 72 dB

LM1086-3.3, VIN= 6.3 V 60 72 dB

LM1086-5.0 VIN = 8 V 60 68 dB

Adjust Pin LM1086 55 120 µA

Current

Adjust Pin 10 mA ≤IOUT ≤IFULL LOAD, 1.5 0.2 5 µA

Current Change V ≤(VIN−VOUT)≤15 V

Temperature 0.5%

Stability

Long Term TA= 125°C, 1000 Hrs 0.3% 1.0%

Stability

RMS Noise 10 Hz ≤f≤10 kHz 0.003%

(% of VOUT)

(5) Dropout voltage is specified over the full output current range of the device.

(6) The minimum output current required to maintain regulation.

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6.6 Typical Characteristics

Figure 2. Short-Circuit Current vs Input/Output Difference

Figure 1. Dropout Voltage vs Output Current

Figure 4. Percent Change in Output Voltage vs

Figure 3. Load Regulation vs Temperature Temperature

Figure 5. Adjust Pin Current vs Temperature Figure 6. Maximum Power Dissipation vs Temperature

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Typical Characteristics (continued)

Figure 8. Ripple Rejection vs Output Current (LM1086-

Figure 7. Ripple Rejection vs Frequency (LM1086-ADJ) ADJ)

Figure 10. Ripple Rejection vs Output Current (LM1086-5)

Figure 9. Ripple Rejection vs Frequency (LM1086-5)

Figure 11. Line Transient Response Figure 12. Load Transient Response

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7 Detailed Description

7.1 Overview

A basic functional diagram for the LM1086-ADJ (excluding protection circuitry) is shown in Figure 13. The

topology is basically that of the LM317 except for the pass transistor. Instead of a Darlingtion NPN with its two

diode voltage drop, the LM1086 uses a single NPN. This results in a lower dropout voltage. The structure of the

pass transistor is also known as a quasi LDO. The advantage of a quasi LDO over a PNP LDO is its inherently

lower quiescent current. The LM1086 is specified to provide a minimum dropout voltage of 1.5V over

temperature, at full load.

Figure 13. Basic Functional Block Diagram

7.2 Functional Block Diagram

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7.3 Feature Description

7.3.1 Ripple Rejection

Ripple rejection is a function of the open loop gain within the feed-back loop (refer to Figure 13 and Figure 16).

The LM1086 exhibits 75dB of ripple rejection (typ.). When adjusted for voltages higher than VREF, the ripple

rejection decreases as function of adjustment gain: (1+R1/R2) or VO/VREF. Therefore a 5-V adjustment decreases

ripple rejection by a factor of four (−12dB); Output ripple increases as adjustment voltage increases.

However, the adjustable version allows this degradation of ripple rejection to be compensated. The adjust

terminal can be bypassed to ground with a capacitor (CADJ). The impedance of the CADJ should be equal to or

less than R1 at the desired ripple frequency. This bypass capacitor prevents ripple from being amplified as the

output voltage is increased.

1/(2π*fRIPPLE*CADJ)≤R1(1)

7.3.2 Load Regulation

The LM1086 regulates the voltage that appears between its output and ground pins, or between its output and

adjust pins. In some cases, line resistances can introduce errors to the voltage across the load. To obtain the

best load regulation, a few precautions are needed.

Figure 14 shows a typical application using a fixed output regulator. Rt1 and Rt2 are the line resistances. VLOAD

is less than the VOUT by the sum of the voltage drops along the line resistances. In this case, the load regulation

seen at the RLOAD would be degraded from the data sheet specification. To improve this, the load should be tied

directly to the output terminal on the positive side and directly tied to the ground terminal on the negative side.

Figure 14. Typical Application Using Fixed Output Regulator

When the adjustable regulator is used (Figure 15), the best performance is obtained with the positive side of the

resistor R1 tied directly to the output terminal of the regulator rather than near the load. This eliminates line drops

from appearing effectively in series with the reference and degrading regulation. For example, a 5V regulator with

0.05-Ωresistance between the regulator and load will have a load regulation due to line resistance of 0.05 Ω× IL.

If R1 (=125 Ω) is connected near the load the effective line resistance will be 0.05 Ω(1 + R2/R1) or in this case,

it is 4 times worse. In addition, the ground side of the resistor R2 can be returned near the ground of the load to

provide remote ground sensing and improve load regulation.

Figure 15. Best Load Regulation Using Adjustable Output Regulator

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Feature Description (continued)

7.3.3 Overload Recovery

Overload recovery refers to regulator's ability to recover from a short circuited output. A key factor in the recovery

process is the current limiting used to protect the output from drawing too much power. The current limiting circuit

reduces the output current as the input to output differential increases. Refer to short circuit curve in the Typical

Characteristics section.

During normal start-up, the input to output differential is small since the output follows the input. But, if the output

is shorted, then the recovery involves a large input to output differential. Sometimes during this condition the

current limiting circuit is slow in recovering. If the limited current is too low to develop a voltage at the output, the

voltage will stabilize at a lower level. Under these conditions it may be necessary to recycle the power of the

regulator in order to get the smaller differential voltage and thus adequate start up conditions. Refer to Typical

Characteristics section for the short circuit current vs. input differential voltage.

7.4 Device Functional Modes

7.4.1 Output Voltage

The LM1086 adjustable version develops a 1.25-V reference voltage, (VREF), between the output and the adjust

terminal. As shown in Figure 16, this voltage is applied across resistor R1 to generate a constant current I1. This

constant current then flows through R2. The resulting voltage drop across R2 adds to the reference voltage to

sets the desired output voltage.

The current IADJ from the adjustment terminal introduces an output error . But since it is small (120uA max), it

becomes negligible when R1 is in the 100 Ωrange.

For fixed voltage devices, R1 and R2 are integrated inside the devices.

Figure 16. Basic Adjustable Regulator

7.4.2 Stability Consideration

Stability consideration primarily concerns the phase response of the feedback loop. In order for stable operation,

the loop must maintain negative feedback. The LM1086 requires a certain amount series resistance with

capacitive loads. This series resistance introduces a zero within the loop to increase phase margin and thus

increase stability. The equivalent series resistance (ESR) of solid tantalum or aluminum electrolytic capacitors is

used to provide the appropriate zero (approximately 500 kHz).

Aluminum electrolytics are less expensive than tantalums, but their ESR varies exponentially at cold

temperatures; therefore requiring close examination when choosing the desired transient response over

temperature. Tantalums are a convenient choice because their ESR varies less than 2:1 over temperature.

The recommended load/decoupling capacitance is a 10 uF tantalum or a 50 uF aluminum. These values will

assure stability for the majority of applications.

The adjustable versions allows an additional capacitor to be used at the ADJ pin to increase ripple rejection. If

this is done the output capacitor should be increased to 22uF for tantalum or to 150 uF for aluminum.

Capacitors other than tantalum or aluminum can be used at the adjust pin and the input pin. A 10 uF capacitor is

a reasonable value at the input. See Ripple Rejection section regarding the value for the adjust pin capacitor.

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Device Functional Modes (continued)

It is desirable to have large output capacitance for applications that entail large changes in load current

(microprocessors for example). The higher the capacitance, the larger the available charge per demand. It is also

desirable to provide low ESR to reduce the change in output voltage:

ΔV = ΔI x ESR (2)

It is common practice to use several tantalum and ceramic capacitors in parallel to reduce this change in the

output voltage by reducing the overall ESR.

Output capacitance can be increased indefinitely to improve transient response and stability.

7.4.3 Protection Diodes

Under normal operation, the LM1086 regulator does not need any protection diode. With the adjustable device,

the internal resistance between the adjustment and output terminals limits the current. No diode is needed to

divert the current around the regulator even with a capacitor on the adjustment terminal. The adjust pin can take

a transient signal of ±25 V with respect to the output voltage without damaging the device.

When an output capacitor is connected to a regulator and the input is shorted, the output capacitor will discharge

into the output of the regulator. The discharge current depends on the value of the capacitor, the output voltage

of the regulator, and rate of decrease of VIN. In the LM1086 regulator, the internal diode between the output and

input pins can withstand microsecond surge currents of 10 A to 20 A. With an extremely large output capacitor

(≥1000 µf), and with input instantaneously shorted to ground, the regulator could be damaged. In this case, an

external diode is recommended between the output and input pins to protect the regulator, shown in Figure 17.

Figure 17. Regulator with Protection Diode

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8 Application and Implementation

NOTE

Information in the following applications sections is not part of the TI component

specification, and TI does not warrant its accuracy or completeness. TI’s customers are

responsible for determining suitability of components for their purposes. Customers should

validate and test their design implementation to confirm system functionality.

8.1 Application Information

The LM1086 is versatile in its applications, including uses in programmable output regulation and local on-card

regulation. Or, by connecting a fixed resistor between the ADJUST and OUTPUT terminals, the LM1086 can

function as a precision current regulator. An optional output capacitor can be added to improve transient

response. The ADJUST terminal can be bypassed to achieve very high ripple-rejection ratios, which are difficult

to achieve with standard three-terminal regulators. Please note, in the following applications, if ADJ is mentioned,

it makes use of the adjustable version of the part, however, if GND is mentioned, it is the fixed voltage version of

the part.

8.2 Typical Applications

8.2.1 1.2-V to 15-V Adjustable Regulator

This part can be used as a simple low drop out regulator to enable a variety of output voltages needed for

demanding applications. By using an adjustable R2 resistor a variety of output voltages can be made possible as

shown in Figure 18 based on the LM1086-ADJ.

Figure 18. 1.2-V to 15-V Adjustable Regulator

8.2.1.1 Design Requirements

The device component count is very minimal, employing two resistors as part of a voltage divider circuit and an

output capacitor for load regulation.

8.2.1.2 Detailed Design Procedure

The voltage divider for this part is set based on the equation shown in Figure 18, where R1 is the upper feedback

resistor R2 is the lower feedback resistor.

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Typical Applications (continued)

8.2.1.3 Application Curve

8.2.2 Adjustable at 5 V

The application shown in Figure 19 outlines a simple 5-V output application made possible by the LM1086-ADJ.

This application can provide 1.5 A at high efficiencies and very low drop-out.

Figure 19. Adjustable at 5 V

8.2.3 5-V Regulator with Shutdown

A variation of the 5-V output regulator application with shutdown control is shown in Figure 20 based on the

LM1086-ADJ. It uses a simple NPN transistor on the ADJ pin to block or sink the current on the ADJ pin. If the

TTL logic is pulled high, the NPN transistor is activated and the part is disabled, outputting approximately 1.25 V.

If the TTL logic is pulled low, the NPN transistor is unbiased and the regulator functions normally.

Figure 20. 5-V Regulator with Shutdown

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Typical Applications (continued)

8.2.4 Battery Charger

The LM1086-ADJ can be used as a battery charger to regulate the charging current required by the battery bank

as shown in Figure 21. In this application the LM1086 acts as a constant voltage, constant current part by

sensing the voltage potential across the battery and compensating it to the current voltage. To maintain this

voltage, the regulator delivers the maximum charging current required to charge the battery. As the battery

approaches the fully charged state, the potential drop across the sense resistor, RSreduces and the regulator

throttles back the current to maintain the float voltage of the battery.

Figure 21. Battery Charger

8.2.5 Adjustable Fixed Regulator

A simple adjustable, fixed range output regulator can be made possible by placing a variable resistor on the

ground of the device as shown in Figure 22 based on the fixed output voltage LM1086-5.0. The GND pin has a

small quiescent current of 5 mA typical. Increasing the resistance on the GND pin increases the voltage potential

across the resistor. This potential is then mirrored on to the output to increase the total output voltage by the

potential drop across the GND resistor.

Figure 22. Adjustable Fixed Regulator

8.2.6 Regulator With Reference

A fixed output voltage version of the LM1086-5.0 can be employed to provide an output rail and a reference rail

at the same time as shown in Figure 23. This simple application makes use of a reference diode, the LM136-5,

to regulate the GND voltage to a fixed 5 V based on the quiescent current generated by the GND pin. This

voltage is then added onto the output to generate a total of 10 V out.

Figure 23. Regulator With Reference

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Typical Applications (continued)

8.2.7 High Current Lamp Driver Protection

A simple constant current source with protection can be designed by controlling the impedance between the

lamp and ground. The LM1086-ADJ shown in Figure 24 makes use of an external TTL or CMOS input to drive

the NPN transistor. This pulls the output of the regulator to a few tenths of a volt and puts the part into current

limit. Releasing the logic will reduce the current flow across the lamp into the normal operating current thereby

protecting the lamp during startup.

Figure 24. High Current Lamp Driver Protection

8.2.8 Battery Backup Regulated Supply

A regulated battery backup supply can be generated by using two fixed output voltage versions of the part as

shown in Figure 25. The top regulator supplies the Line voltage during normal operation, however when the input

is not available, the second regulator derives power from the battery backup and regulates it to 5 V based on the

LM1086-5.0. The diodes prevent the rails from back feeding into the supply and batteries.

Figure 25. Battery Backup Regulated Supply

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Typical Applications (continued)

8.2.9 Ripple Rejection Enhancement

A very simple ripple rejection circuit is shown in Figure 26 using the LM1086-ADJ. The capacitor C1 smooths out

the ripple on the output by cleaning up the feedback path and preventing excess noise from feeding back into the

regulator. Please remember XC1 should be approximately equal to R1 at the ripple frequency.

Figure 26. Ripple Rejection Enhancement

8.2.10 Automatic Light Control

A common street light control or automatic light control circuit is designed in Figure 27 based on the LM1086-

ADJ. The photo transistor conducts in the presence of light and grounds the ADJ pin preventing the lamp from

turning on. However, in the absence of light, the LM1086 regulates the voltage to 1.25 V between OUT and ADJ,

ensuring the lamp remains on.

Figure 27. Automatic Light Control

8.2.11 Remote Sensing

Remote sensing is a method of compensating the output voltage to a very precise degree by sensing the output

and feeding it back through the feedback. The circuit implementing this is shown in Figure 28 using the LM1086-

ADJ. The output of the regulator is fed into a voltage follower to avoid any loading effects and the output of the

op-amp is injected into the top of the feedback resistor network. This has the effect of modulating the voltage to a

precise degree without additional loading on the output.

Figure 28. Remote Sensing

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9 Power Supply Recommendations

The linear regulator input supply should be well regulated and kept at a voltage level such that the maximum

input to output voltage differential allowed by the device is not exceeded. The minimum dropout voltage (VIN –

VOUT) should be met with extra headroom when possible in order to keep the output well regulated. A 10 μF or

higher capacitor should be placed at the input to bypass noise.

10 Layout

10.1 Layout Guidelines

For the best overall performance, some layout guidelines should be followed. Place all circuit components on the

same side of the circuit board and as near as practical to the respective linear regulator pins connections. Traces

should be kept short and wide to reduce the amount of parasitic elements into the system. The actual width and

thickness of traces will depend on the current carrying capability and heat dissipation required by the end

system. An array of plated vias can be placed on the pad area underneath the TAB to conduct heat to any inner

plane areas or to a bottom-side copper plane.

10.2 Layout Example

Figure 29. Layout Example

Product Folder Links: LM1086

LM1086

www.ti.com

SNVS039J –JUNE 2000–REVISED APRIL 2015

10.3 Thermal Considerations

ICs heats up when in operation, and power consumption is one factor in how hot it gets. The other factor is how

well the heat is dissipated. Heat dissipation is predictable by knowing the thermal resistance between the IC and

ambient (θJA). Thermal resistance has units of temperature per power (C/W). The higher the thermal resistance,

the hotter the IC.

The LM1086 specifies the thermal resistance for each package as junction to case (θJC). In order to get the total

resistance to ambient (θJA), two other thermal resistance must be added, one for case to heat-sink (θCH) and one

for heatsink to ambient (θHA). The junction temperature can be predicted as follows:

TJ= TA+ PD(θJC +θCH +θHA)=TA+ PDθJA

where

• TJis junction temperature

• TAis ambient temperature

• PDis the power consumption of the device (3)

Device power consumption is calculated as follows:

IIN = IL+ IG(4)

PD= (VIN−VOUT) IL+ VINIG(5)

Figure 30 shows the voltages and currents which are present in the circuit.

Figure 30. Power Dissipation Diagram

Once the devices power is determined, the maximum allowable (θJA (max)) is calculated as:

θJA (max) = TR(max)/PD= TJ(max) −TA(max)/PD

The LM1086 has different temperature specifications for two different sections of the IC: the control section and

the output section. The Thermal Information table shows the junction to case thermal resistances for each of

these sections, while the maximum junction temperatures (TJ(max)) for each section is listed in the Absolute

Maximum Ratings section of the datasheet. TJ(max) is 125°C for the control section, while TJ(max) is 150°C for the

output section.

θJA (max) should be calculated separately for each section as follows:

θJA (max, CONTROL SECTION) = (125°C - TA(max))/PD(6)

θJA (max, OUTPUT SECTION) = (150°C - TA(max))/PD(7)

The required heat sink is determined by calculating its required thermal resistance (θHA (max)).

θHA (max) =θJA (max) −(θJC +θCH) (8)

(θHA (max)) should also be calculated twice as follows:

(θHA (max)) = θJA (max, CONTROL SECTION) - (θJC (CONTROL SECTION) + θCH) (9)

(θHA (max)) = θJA(max, OUTPUT SECTION) - (θJC (OUTPUT SECTION) + θCH) (10)

If thermal compound is used, θCH can be estimated at 0.2 C/W. If the case is soldered to the heat sink, then a

θCH can be estimated as 0 C/W.

After, θHA (max) is calculated for each section, choose the lower of the two θHA (max) values to determine the

appropriate heat sink.

Product Folder Links: LM1086

LM1086

SNVS039J –JUNE 2000–REVISED APRIL 2015

www.ti.com

Thermal Considerations (continued)

If PC board copper is going to be used as a heat sink, then Figure 31 can be used to determine the appropriate

area (size) of copper foil required.

Figure 31. Heat Sink Thermal Resistance vs Area

Product Folder Links: LM1086

LM1086

www.ti.com

SNVS039J –JUNE 2000–REVISED APRIL 2015

11 Device and Documentation Support

11.1 Development Support

For additional information, see Texas Instruments' E2E community resources at http://e2e.ti.com.

11.2 Trademarks

All trademarks are the property of their respective owners.

11.3 Electrostatic Discharge Caution

These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam

during storage or handling to prevent electrostatic damage to the MOS gates.

11.4 Glossary

SLYZ022 —TI Glossary.

This glossary lists and explains terms, acronyms, and definitions.

12 Mechanical, Packaging, and Orderable Information

The following pages include mechanical, packaging, and orderable information. This information is the most

current data available for the designated devices. This data is subject to change without notice and revision of

this document. For browser-based versions of this data sheet, refer to the left-hand navigation.

Product Folder Links: LM1086

PACKAGE OPTION ADDENDUM

www.ti.com 29-Jun-2017

Addendum-Page 1

PACKAGING INFORMATION

Orderable Device Status

(1)

Package Type Package

Drawing Pins Package

Qty Eco Plan

(2)

Lead/Ball Finish

(6)

MSL Peak Temp

(3)

Op Temp (°C) Device Marking

(4/5)

Samples

LM1086CS-2.5/NOPB ACTIVE DDPAK/

TO-263 KTT 3 45 Pb-Free (RoHS

Exempt) CU SN Level-3-245C-168 HR 0 to 125 LM1086

CS-2.5

LM1086CS-3.3/NOPB ACTIVE DDPAK/

TO-263 KTT 3 45 Pb-Free (RoHS

Exempt) CU SN Level-3-245C-168 HR 0 to 125 LM1086

CS-3.3

LM1086CS-5.0/NOPB ACTIVE DDPAK/

TO-263 KTT 3 45 Pb-Free (RoHS

Exempt) CU SN Level-3-245C-168 HR 0 to 125 LM1086

CS-5.0

LM1086CS-ADJ NRND DDPAK/

TO-263 KTT 3 45 TBD Call TI Call TI LM1086

CS-ADJ

LM1086CS-ADJ/NOPB ACTIVE DDPAK/

TO-263 KTT 3 45 Pb-Free (RoHS

Exempt) CU SN Level-3-245C-168 HR 0 to 125 LM1086

CS-ADJ

LM1086CSX-2.5/NOPB ACTIVE DDPAK/

TO-263 KTT 3 500 Pb-Free (RoHS

Exempt) CU SN Level-3-245C-168 HR 0 to 125 LM1086

CS-2.5

LM1086CSX-3.3/NOPB ACTIVE DDPAK/

TO-263 KTT 3 500 Pb-Free (RoHS

Exempt) CU SN Level-3-245C-168 HR 0 to 125 LM1086

CS-3.3

LM1086CSX-ADJ/NOPB ACTIVE DDPAK/

TO-263 KTT 3 500 Pb-Free (RoHS

Exempt) CU SN Level-3-245C-168 HR 0 to 125 LM1086

CS-ADJ

LM1086CT-3.3/NOPB ACTIVE TO-220 NDE 3 45 Green (RoHS

& no Sb/Br) CU SN Level-1-NA-UNLIM 0 to 125 LM1086

CT-3.3

LM1086CT-5.0/NOPB ACTIVE TO-220 NDE 3 45 Green (RoHS

& no Sb/Br) CU SN Level-1-NA-UNLIM 0 to 125 LM1086

CT-5.0

LM1086CT-ADJ/NOPB ACTIVE TO-220 NDE 3 45 Green (RoHS

& no Sb/Br) CU SN Level-1-NA-UNLIM 0 to 125 LM1086

CT-ADJ

LM1086ILD-3.3/NOPB ACTIVE WSON NGN 8 1000 Green (RoHS

& no Sb/Br) CU SN Level-3-260C-168 HR -40 to 125 1086I33

LM1086IS-1.8/NOPB ACTIVE DDPAK/

TO-263 KTT 3 45 Pb-Free (RoHS

Exempt) CU SN Level-3-245C-168 HR -40 to 125 LM1086

IS-1.8

LM1086IS-3.3 NRND DDPAK/

TO-263 KTT 3 45 TBD Call TI Call TI -40 to 125 LM1086

IS-3.3

LM1086IS-3.3/NOPB ACTIVE DDPAK/

TO-263 KTT 3 45 Pb-Free (RoHS

Exempt) CU SN Level-3-245C-168 HR -40 to 125 LM1086

IS-3.3

LM1086IS-5.0 ACTIVE DDPAK/

TO-263 KTT 3 45 TBD Call TI Call TI -40 to 125 LM1086

IS-5.0

LM1086IS-5.0/NOPB ACTIVE DDPAK/

TO-263 KTT 3 45 Pb-Free (RoHS

Exempt) CU SN Level-3-245C-168 HR -40 to 125 LM1086

IS-5.0

PACKAGE OPTION ADDENDUM

www.ti.com 29-Jun-2017

Addendum-Page 2

Orderable Device Status

(1)

Package Type Package

Drawing Pins Package

Qty Eco Plan

(2)

Lead/Ball Finish

(6)

MSL Peak Temp

(3)

Op Temp (°C) Device Marking

(4/5)

Samples

LM1086IS-ADJ/NOPB ACTIVE DDPAK/

TO-263 KTT 3 45 Pb-Free (RoHS

Exempt) CU SN Level-3-245C-168 HR -40 to 125 LM1086

IS-ADJ

LM1086ISX-1.8/NOPB ACTIVE DDPAK/

TO-263 KTT 3 500 Pb-Free (RoHS

Exempt) CU SN Level-3-245C-168 HR -40 to 125 LM1086

IS-1.8

LM1086ISX-3.3/NOPB ACTIVE DDPAK/

TO-263 KTT 3 500 Pb-Free (RoHS

Exempt) CU SN Level-3-245C-168 HR -40 to 125 LM1086

IS-3.3

LM1086ISX-5.0/NOPB ACTIVE DDPAK/

TO-263 KTT 3 500 Pb-Free (RoHS

Exempt) CU SN Level-3-245C-168 HR -40 to 125 LM1086

IS-5.0

LM1086ISX-ADJ/NOPB ACTIVE DDPAK/

TO-263 KTT 3 500 Pb-Free (RoHS

Exempt) CU SN Level-3-245C-168 HR -40 to 125 LM1086

IS-ADJ

LM1086IT-3.3/NOPB ACTIVE TO-220 NDE 3 45 Green (RoHS

& no Sb/Br) CU SN Level-1-NA-UNLIM -40 to 125 LM1086

IT-3.3

LM1086IT-5.0/NOPB ACTIVE TO-220 NDE 3 45 Green (RoHS

& no Sb/Br) CU SN Level-1-NA-UNLIM -40 to 125 LM1086

IT-5.0

LM1086IT-ADJ/NOPB ACTIVE TO-220 NDE 3 45 Green (RoHS

& no Sb/Br) CU SN Level-1-NA-UNLIM -40 to 125 LM1086

IT-ADJ

(1) The marketing status values are defined as follows:

ACTIVE: Product device recommended for new designs.

LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect.

NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design.

PREVIEW: Device has been announced but is not in production. Samples may or may not be available.

OBSOLETE: TI has discontinued the production of the device.

(2) RoHS: TI defines "RoHS" to mean semiconductor products that are compliant with the current EU RoHS requirements for all 10 RoHS substances, including the requirement that RoHS substance

do not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, "RoHS" products are suitable for use in specified lead-free processes. TI may

reference these types of products as "Pb-Free".

RoHS Exempt: TI defines "RoHS Exempt" to mean products that contain lead but are compliant with EU RoHS pursuant to a specific EU RoHS exemption.

Green: TI defines "Green" to mean the content of Chlorine (Cl) and Bromine (Br) based flame retardants meet JS709B low halogen requirements of <=1000ppm threshold. Antimony trioxide based

flame retardants must also meet the <=1000ppm threshold requirement.

(3) MSL, Peak Temp. - The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder temperature.

(4) There may be additional marking, which relates to the logo, the lot trace code information, or the environmental category on the device.

(5) Multiple Device Markings will be inside parentheses. Only one Device Marking contained in parentheses and separated by a "~" will appear on a device. If a line is indented then it is a continuation

of the previous line and the two combined represent the entire Device Marking for that device.

PACKAGE OPTION ADDENDUM

www.ti.com 29-Jun-2017

Addendum-Page 3

(6) Lead/Ball Finish - Orderable Devices may have multiple material finish options. Finish options are separated by a vertical ruled line. Lead/Ball Finish values may wrap to two lines if the finish

value exceeds the maximum column width.

Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is provided. TI bases its knowledge and belief on information

provided by third parties, and makes no representation or warranty as to the accuracy of such information. Efforts are underway to better integrate information from third parties. TI has taken and

continues to take reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on incoming materials and chemicals.

TI and TI suppliers consider certain information to be proprietary, and thus CAS numbers and other limited information may not be available for release.

In no event shall TI's liability arising out of such information exceed the total purchase price of the TI part(s) at issue in this document sold by TI to Customer on an annual basis.

TAPE AND REEL INFORMATION

*All dimensions are nominal

Device Package

Type Package

Drawing Pins SPQ Reel

Diameter

(mm)

Reel

Width

W1 (mm)

(mm) B0

(mm) K0

(mm) P1

(mm) W

(mm) Pin1

Quadrant

LM1086CSX-2.5/NOPB DDPAK/

TO-263 KTT 3 500 330.0 24.4 10.75 14.85 5.0 16.0 24.0 Q2

LM1086CSX-3.3/NOPB DDPAK/

TO-263 KTT 3 500 330.0 24.4 10.75 14.85 5.0 16.0 24.0 Q2

LM1086CSX-ADJ/NOPB DDPAK/

TO-263 KTT 3 500 330.0 24.4 10.75 14.85 5.0 16.0 24.0 Q2

LM1086ILD-3.3/NOPB WSON NGN 8 1000 178.0 12.4 4.3 4.3 1.3 8.0 12.0 Q1

LM1086ISX-1.8/NOPB DDPAK/

TO-263 KTT 3 500 330.0 24.4 10.75 14.85 5.0 16.0 24.0 Q2

LM1086ISX-3.3/NOPB DDPAK/

TO-263 KTT 3 500 330.0 24.4 10.75 14.85 5.0 16.0 24.0 Q2

LM1086ISX-5.0/NOPB DDPAK/

TO-263 KTT 3 500 330.0 24.4 10.75 14.85 5.0 16.0 24.0 Q2

LM1086ISX-ADJ/NOPB DDPAK/

TO-263 KTT 3 500 330.0 24.4 10.75 14.85 5.0 16.0 24.0 Q2

PACKAGE MATERIALS INFORMATION

www.ti.com 20-Sep-2016

Pack Materials-Page 1

*All dimensions are nominal

Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm)

LM1086CSX-2.5/NOPB DDPAK/TO-263 KTT 3 500 367.0 367.0 45.0

LM1086CSX-3.3/NOPB DDPAK/TO-263 KTT 3 500 367.0 367.0 45.0

LM1086CSX-ADJ/NOPB DDPAK/TO-263 KTT 3 500 367.0 367.0 45.0

LM1086ILD-3.3/NOPB WSON NGN 8 1000 210.0 185.0 35.0

LM1086ISX-1.8/NOPB DDPAK/TO-263 KTT 3 500 367.0 367.0 45.0

LM1086ISX-3.3/NOPB DDPAK/TO-263 KTT 3 500 367.0 367.0 45.0

LM1086ISX-5.0/NOPB DDPAK/TO-263 KTT 3 500 367.0 367.0 45.0

LM1086ISX-ADJ/NOPB DDPAK/TO-263 KTT 3 500 367.0 367.0 45.0

PACKAGE MATERIALS INFORMATION

www.ti.com 20-Sep-2016

Pack Materials-Page 2

MECHANICAL DATA

NDE0003B

www.ti.com

MECHANICAL DATA

KTT0003B

www.ti.com

BOTTOM SIDE OF PACKAGE

TS3B (Rev F)

MECHANICAL DATA

NGN0008A

www.ti.com

LDC08A (Rev B)

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Click to View Pricing, Inventory, Delivery & Lifecycle Information:

Texas Instruments:

LM1086CS-2.5 LM1086CS-2.5/NOPB LM1086CS-3.3 LM1086CS-3.3/NOPB LM1086CS-5.0 LM1086CS-5.0/NOPB

LM1086CS-ADJ LM1086CS-ADJ/NOPB LM1086CSX-2.5 LM1086CSX-2.5/NOPB LM1086CSX-3.3 LM1086CSX-

3.3/NOPB LM1086CSX-ADJ LM1086CSX-ADJ/NOPB LM1086CT-3.3 LM1086CT-3.3/NOPB LM1086CT-5.0

LM1086CT-5.0/NOPB LM1086CT-ADJ LM1086CT-ADJ/NOPB LM1086ILD-3.3 LM1086ILD-3.3/NOPB LM1086IS-1.8

LM1086IS-1.8/NOPB LM1086IS-3.3 LM1086IS-3.3/NOPB LM1086IS-5.0 LM1086IS-5.0/NOPB LM1086IS-ADJ

LM1086IS-ADJ/NOPB LM1086ISX-1.8/NOPB LM1086ISX-3.3 LM1086ISX-3.3/NOPB LM1086ISX-5.0 LM1086ISX-

5.0/NOPB LM1086ISX-ADJ LM1086ISX-ADJ/NOPB LM1086IT-3.3 LM1086IT-3.3/NOPB LM1086IT-5.0 LM1086IT-

5.0/NOPB LM1086IT-ADJ LM1086IT-ADJ/NOPB