General Description
The MAX8863T/S/R and MAX8864T/S/R low-dropout linear
regulators operate from a +2.5V to +6.5V input range and
deliver up to 120mA. A PMOS pass transistor allows the
low, 80μA supply current to remain independent of load,
making these devices ideal for battery-operated portable
equipment such as cellular phones, cordless phones, and
modems.
The devices feature Dual Mode™ operation: their output
voltage is preset (at 3.15V for the T versions, 2.84V for
the S versions, or 2.80V for the R versions) or can be
adjusted with an external resistor divider. Other features
include low-power shutdown, short-circuit protection, thermal
shutdown protection, and reverse battery protection. The
MAX8864 also includes an auto-discharge function, which
actively discharges the output voltage to ground when the
device is placed in shutdown mode. Both devices come in
a miniature 5-pin SOT23 package.
Applications
●Cordless Telephones
●PCS Telephones
●Cellular Telephones
●PCMCIA Cards
●Modems
●Hand-Held Instruments
●Palmtop Computers
● Electronic Planners
Benets and Features
●Low Cost
● Low, 55mV Dropout Voltage at 50mA IOUT
● Low, 68μA No-Load Supply Current
Low, 80μA Operating Supply Current (even in
dropout)
● Low, 350μVRMS Output Noise
●Miniature External Components
● Thermal Overload Protection
●Output Current Limit
● Reverse Battery Protection
● Dual Mode Operation: Fixed or Adjustable
(1.25V to 6.5V) Output
●Low-Power Shutdown
19-0466; Rev 6; 5/16
Dual Mode is a trademark of Maxim Integrated Products, Inc.
*Alternate marking information: CY_ _ = MAX8863T,
CZ_ _ = MAX8863S, DA_ _ = MAX8864T, DB_ _ = MAX8864S
+Denotes a lead(Pb)-free/RoHS-compliant package.
PART TEMP RANGE PIN-PACKAGE
MAX8863TEUK+T -40°C to +85°C 5 SOT23
MAX8863TMUK/PR3+T -55°C to +125°C 5 SOT23
MAX8863SEUK+T -40°C to +85°C 5 SOT23
MAX8863REUK+T -40°C to +85°C 5 SOT23
MAX8864TEUK+T -40°C to +85°C 5 SOT23
MAX8864SEUK+T -40°C to +85°C 5 SOT23
MAX8864REUK+T -40°C to +85°C 5 SOT23
MAX8863
MAX8864
OUT
GND SET
IN
SHDN
COUT
1µF
CIN
1µF
BATTERY
OUTPUT
VOLTAGE
SOT23
TOP VIEW
GND
OUT
IN
1
+
5SET
SHDN
MAX8863
MAX8864
2
34
MAX8863T/S/R,
MAX8864T/S/R
Low-Dropout, 120mA Linear Regulators
Typical Operating Circuit Pin Conguration
Ordering Information
VIN to GND ................................................................. -7V to +7V
Output Short-Circuit Duration ........................................... Infinite
SET to GND ............................................................-0.3V to +7V
SHDN to GND ............................................................-7V to +7V
SHDN to IN ..............................................................-7V to +0.3V
OUT to GND ...............................................-0.3V to (VIN + 0.3V)
Continuous Power Dissipation (multilayer board, TA = +70°C)
SOT23 (3.9mW/°C above +70°C) ............................312.6mW
Operating Temperature Range ........................... -40°C to +85°C
Operating Temperature
Range (MAX8863TMUK/PR3+).................... -55°C to +125°C
Junction Temperature ...................................................... +150°C
Storage Temperature Range ............................ -65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
Soldering Temperature (reflow) .......................................+260°C
SOT23
Junction-to-Ambient Thermal Resistance (θJA) .....255.9°C/W
Junction-to-Case Thermal Resistance (θJC) ...............81°C/W
(Note 1)
(VIN = +3.6V, VGND = 0V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) (Note 2)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Input Voltage (Note 3) VIN 2.5 6.5 V
Output Voltage VOUT 0mA ≤ IOUT ≤
50mA, SET = GND
MAX886_T 3.05 3.15 3.25
VMAX886_S 2.75 2.84 2.93
MAX886_R 2.70 2.80 2.88
Adjustable Output Voltage
Range (Note 4) VOUT VSET 6.5 V
Maximum Output Current 120 mA
Current Limit (Note 5) ILIM 280 mA
Ground Pin Current IQSET = GND ILOAD = 0mA 68 150 µA
ILOAD = 50mA 80
Dropout Voltage (Note 6) IOUT = 1mA 1.1 mV
IOUT = 50mA 55 120
Line Regulation ∆VLNR VIN = 2.5V to 6.5V, SET tied to OUT,
IOUT = 1mA -0.15 0 +0.15 %/V
Load Regulation ∆VLDR IOUT = 0mA to
50mA
SET = GND 0.011 0.040 %/mA
SET tied to OUT 0.006
Output Voltage Noise 10Hz to 1MHz COUT = 1µF 350 µVRMS
COUT = 100µF 220
SHUTDOWN
SHDN Input Threshold VIH 2.0 V
VIL 0.4
MAX8863T/S/R,
MAX8864T/S/R
Low-Dropout, 120mA Linear Regulators
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Note 1: Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a four-layer
board. For detailed information on package thermal considerations, refer to www.maximintegrated.com/thermal-tutorial.
Absolute Maximum Ratings
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these
or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect
device reliability.
Package Thermal Characteristics
Electrical Characteristics
(VIN = +3.6V, VGND = 0V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) (Note 2)
Note 2: Limits are 100% production tested at TA = +25°C. Limits over the operating temperature range are guaranteed through cor-
relation using Statistical Quality Control (SQC) Methods.
Note 3: Guaranteed by line regulation test.
Note 4: Adjustable mode only.
Note 5: Not tested. For design purposes, the current limit should be considered 120mA minimum to 420mA maximum.
Note 6: The dropout voltage is defined as (VIN - VOUT) when VOUT is 100mV below the value of VOUT for VIN = VOUT +2V.
(VIN = +3.6V, CIN = 1μF, COUT = 1μF, TA = +25°C, MAX886_T, unless otherwise noted.)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
SHDN Input Bias Current ISHDN VSHDN = VIN
TA = +25°C 0 100 nA
TA = TMAX 0.05
Shutdown Supply Current IQSHDN VOUT = 0V TA = +25°C 0.0001 1µA
TA = TMAX 0.02
Shutdown Discharge Resistance
(MAX8864) 300 Ω
SET INPUT
Set Reference Voltage
(Note 4) VSET VIN = 2.5V to 6.5V,
IOUT = 1mA
TA = +25°C 1.225 1.25 1.275
V
E temp range 1.215 1.25 1.285
M temp range 1.205 1.25 1.285
Set Input Leakage Current
(Note 4) ISET VSET = 1.3V TA = +25°C 0.015 2.5 nA
TA = TMAX 0.5
THERMAL PROTECTION
Thermal Shutdown Temperature TSHDN 170 °C
Thermal Shutdown Hysteresis ∆TSHDN 20 °C
100
50
0 20 60 100
SUPPLY CURRENT
vs. LOAD CURRENT
60
90
MAX8863/4-02
LOAD CURRENT (mA)
SUPPLY CURRENT (µA)
40 80
10 30 7050 90
80
70
95
55
85
75
65
0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
0 1 2 4 6
OUTPUT VOLTAGE
vs. INPUT VOLTAGE
MAX8863/4-03
INPUT VOLTAGE (V)
OUTPUT VOLTAGE (V)
3 5
NO LOAD
3.00
3.05
3.10
3.15
3.20
3.25
3.30
0 20 60 100
OUTPUT VOLTAGE
vs. LOAD CURRENT
MAX8863/4-01
LOAD CURRENT (mA)
OUTPUT VOLTAGE (V)
40 8010 30 7050 90
MAX8863T/S/R,
MAX8864T/S/R
Low-Dropout, 120mA Linear Regulators
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Electrical Characteristics (continued)
Typical Operating Characteristics
(VIN = +3.6V, CIN = 1μF, COUT = 1μF, TA = +25°C, MAX886_T, unless otherwise noted.)
0
10
20
30
40
50
60
70
80
90
0 1 2 4 6
SUPPLY CURRENT
vs. INPUT VOLTAGE
MAX8863/4-04
INPUT VOLTAGE (V)
3 5
SUPPLY CURRENT (µA)
ILOAD = 0mA
ILOAD = 50mA
3.00
3.05
3.10
3.15
3.20
3.25
3.30
0 20-20 60
100
OUTPUT VOLTAGE
vs. TEMPERATURE
MAX8863/4-05
TEMPERATURE (°C)
OUTPUT VOLTAGE (V)
40-40 80
ILOAD = 50mA
0
10
20
30
40
50
60
70
80
90
100
100806040200-20-40
SUPPLY CURRENT
vs. TEMPERATURE
MAX8863/4-06
TEMPERATURE (°C)
SUPPLY CURRENT (µA)
ILOAD = 50mA
0
20
40
60
80
100
120
140
0 20 60 100
DROPOUT VOLTAGE
vs. LOAD CURRENT
MAX8863/4-07
LOAD CURRENT (mA)
DROPOUT VOLTAGE (mV)
40 8010 30 7050 90
TA = +85°C
TA = +25°C
TA = -40°C
1 10
MAX8863/4-08
FREQUENCY (kHz)
PSRR (dB)
70
60
50
40
30
20
10
0
100
1000
0.10.01
VOUT = 3.15V
RL = 100W
COUT = 10µF
COUT = 1µF
POWER-SUPPLY REJECTION RATIO
vs. FREQUENCY
10
0.01
0.1 10 1001 1000
OUTPUT SPECTRAL NOISE DENSITY
vs. FREQUENCY
0.10
MAX8863/64-8A
FREQUENCY (kHz)
OUTPUT SPECTRAL NOISE DENSITY (µV/÷Hz)
1
RL = 50Ω
COUT = 1µF
COUT = 100F
1000
0.01
0 50 60 70 80 9010 20 30 40 100
REGION OF STABLE COUT ESR
vs. LOAD CURRENT
0.1
MAX8863/64-8B
LOAD CURRENT (mA)
COUT ESR (Ω)
1
10
100
INTERNAL FEEDBACK
STABLE REGION
COUT = 1µF
EXTERNAL FEEDBACK
ILOAD = 50mA, VOUT IS AC COUPLED
OUTPUT NOISE DC TO 1MHz
VOUT
1ms/div
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MAX8863T/S/R,
MAX8864T/S/R
Low-Dropout, 120mA Linear Regulators
Typical Operating Characteristics (continued)
(VIN = +3.6V, CIN = 1μF, COUT = 1μF, TA = +25°C, MAX886_T, unless otherwise noted.)
ILOAD = 50mA, VOUT IS AC COUPLED
LINE TRANSIENT
3.16V
VOUT 3.15V
3.14V
4.6V
3.6V
VIN
50µs/div
ILOAD = 0mA to 50mA, CIN = 10µF, VOUT IS AC COUPLED
LOAD TRANSIENT
3.16V
VOUT 3.15V
3.14V
ILOAD
10µs/div
VIN = VOUT + 0.2V, ILOAD = 0mA to 50mA, CIN = 10µF,
VOUT IS AC COUPLED
LOAD TRANSIENT
ILOAD
3.16V
VOUT 3.15V
3.14V
10µs/div
VIN = VOUT + 0.1V, ILOAD = 0mA to 50mA, CIN = 10µF,
VOUT IS AC COUPLED
LOAD TRANSIENT
0mA
50mA
10µs/div
3.16V
VOUT 3.15V
3.14V
ILOAD
NO LOAD
MAX8864 SHUTDOWN (NO LOAD)
0V
VSHDN
4V
VOUT
0V
2V
2V
500µs/div
ILOAD = 50mA
MAX8864 SHUTDOWN
0V
VSHDN
VOUT
4V
2V
0V
2V
200µs/div
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MAX8863T/S/R,
MAX8864T/S/R
Low-Dropout, 120mA Linear Regulators
Typical Operating Characteristics (continued)
Detailed Description
The MAX8863/MAX8864 are low-dropout, low-quiescent-
current linear regulators designed primarily for battery-
powered applications. They supply an adjustable 1.25V
to 6.5V output or a preselected 2.80V (MAX886_R),
2.84V (MAX886_S), or 3.15V (MAX886_T) output for load
currents up to 120mA. As illustrated in Figure 1, these
devices consist of a 1.25V reference, error amplifier,
MOSFET driver, P-channel pass transistor, Dual Mode™
comparator, and internal feedback voltage divider.
The 1.25V bandgap reference is connected to the error
amplifier’s inverting input. The error amplifier compares
this reference with the selected feedback voltage and
amplifies the difference. The MOSFET driver reads the
error signal and applies the appropriate drive to the
P-channel pass transistor. If the feedback voltage is lower
than the reference, the pass-transistor gate is pulled
lower, allowing more current to pass and increasing the
output voltage. If the feedback voltage is too high, the
pass-transistor gate is pulled up, allowing less current to
pass to the output.
The output voltage is fed back through either an internal
resistor voltage divider connected to the OUT pin, or an
external resistor network connected to the SET pin. The
Dual Mode comparator examines the SET voltage and
selects the feedback path. If SET is below 60mV, internal
feedback is used and the output voltage is regulated to
the preset output voltage. Additional blocks include a
current limiter, reverse battery protection, thermal sensor,
and shutdown logic.
Figure 1. Functional Diagram
PIN NAME FUNCTION
1SHDN Active-Low Shutdown Input. A logic low reduces the supply current to 0.1nA. On the MAX8864, a logic low also
causes the output voltage to discharge to GND. Connect to IN for normal operation.
2GND Ground. This pin also functions as a heatsink. Solder to large pads or the circuit board ground plane to
maximize thermal dissipation.
3IN Regulator Input. Supply voltage can range from +2.5V to +6.5V. Bypass with 1µF to GND (see Capacitor
Selection and Regulator Stability).
4 OUT Regulator Output. Fixed or adjustable from +1.25V to +6.5V. Sources up to 120mA. Bypass with a 1µF,
< 0.2Ω typical ESR capacitor to GND.
5 SET
Feedback Input for Setting the Output Voltage. Connect to GND to set the output voltage to the preset
2.80V (MAX886_R), 2.84V (MAX886_S), or 3.15V (MAX886_T). Connect to an external resistor-divider for
adjustable-output operation.
SHUTDOWN
LOGIC
ERROR
AMP
1.25V
REF
P
N
*
OUT
SET
DUAL-MODE
COMPARATOR 60mV
* AUTO-DISCHARGE, MAX8864 ONLY
GND
IN
SHDN
MAX8863
MAX8864
MOS DRIVER
WITH ILIMIT
THERMAL
SENSOR
REVERSE
BATTERY
PROTECTION
MAX8863T/S/R,
MAX8864T/S/R
Low-Dropout, 120mA Linear Regulators
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Pin Description
Internal p-Channel Pass Transistor
The MAX8863/MAX8864 feature a 1.1Ω typical pMOSFET
pass transistor. This provides several advantages over
similar designs using PNP pass transistors, including
longer battery life.
The pMOSFET requires no base drive current, which
reduces quiescent current considerably. PNP-based
regulators waste considerable amounts of current in
dropout when the pass transistor saturates. They also
use high base-drive currents under large loads. The
MAX8863/MAX8864 do not suffer from these problems,
and consume only 80μA of quiescent current, whether in
dropout, light load, or heavy load applications (see Typical
Operating Characteristics).
Output Voltage Selection
The MAX8863/MAX8864 feature Dual Mode operation:
they operate in either a preset voltage mode or an adjustable
mode.
In preset voltage mode, internal, trimmed feedback resistors
set the MAX886_R output to 2.80V, the MAX886_S output
to 2.84V, and the MAX886_T output to 3.15V. Select this
mode by connecting SET to ground.
In adjustable mode, select an output between 1.25V and
6.5V using two external resistors connected as a voltage
divider to SET (Figure 2). The output voltage is set by the
following equation:
VOUT = VSET (1 + R1 / R2)
where VSET = 1.25V. To simplify resistor selection:
OUT
SET
V
R1 R2 1
V
= −
Choose R2 = 100kΩ to optimize power consumption,
accuracy, and high-frequency power-supply rejection. The
total current through the external resistive feedback and
load resistors should not be less than 10μA. Since the
VSET tolerance is typically less than ±25mV, the output can
be set using fixed resistors instead of trim pots. Connect
a 10pF to 25pF capacitor across R1 to compensate for
layout-induced parasitic capacitances.
In preset voltage mode, impedances between SET and
ground should be less than 100kΩ. Otherwise, spurious
conditions could cause the voltage at SET to exceed the
60mV Dual Mode threshold.
Shutdown
A low input on the SHDN pin shuts down the MAX8863/
MAX8864. In shutdown mode, the pass transistor, control
circuit, reference, and all biases are turned off, reducing
the supply current to typically 0.1nA. Connect SHDN to
IN for normal operation. The MAX8864 output voltage is
actively discharged to ground when the part is placed in
shutdown (see Typical Operating Characteristics).
Current Limit
The MAX8863/MAX8864 include a current limiter that
monitors and controls the pass transistor’s gate voltage,
estimating the output current and limiting it to about
280mA. For design purposes, the current limit should be
considered 120mA (min) to 420mA (max). The output can
be shorted to ground for an indefinite time period without
damaging the part.
Thermal Overload Protection
Thermal overload protection limits total power dissipation
in the MAX8863/MAX8864. When the junction temperature
exceeds TJ = +170°C, the thermal sensor sends a signal
to the shutdown logic, turning off the pass transistor and
allowing the IC to cool. The thermal sensor will turn the
pass transistor on again after the IC’s junction temperature
typically cools by 20°C, resulting in a pulsed output during
continuous thermal overload conditions.
Thermal overload protection is designed to protect the
MAX8863/MAX8864 in the event of fault conditions.
Stressing the device with high load currents and high
input-output differential voltages (which result in die
temperatures above +125°C) may cause a momentary
overshoot (2% to 8% for 200ms) when the load is
completely removed. This can be remedied by raising the
minimum load current from 0μA (+125°C) to 100μA (+150°C).
For continuous operation, do not exceed the absolute
maximum junction temperature rating of TJ = +150°C.
Figure 2. Adjustable Output Using External Feedback
Resistors
MAX8863
MAX8864
OUT
SET
GND
IN
SHDN
COUT
1µF
CIN
1µF
BATTERY
OUTPUT
VOLTAGE
R1 20pF
R2
RL
MAX8863T/S/R,
MAX8864T/S/R
Low-Dropout, 120mA Linear Regulators
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Operating Region and Power Dissipation
Maximum power dissipation of the MAX8863/MAX8864
depends on the thermal resistance of the case and circuit
board, the temperature difference between the die junction
and ambient air, and the rate of air flow. The power
dissipation across the device is P = IOUT (VIN - VOUT).
The resulting maximum power dissipation is:
PMAX = (TJ - TA) / θJA
where (TJ - TA) is the temperature difference between the
MAX8863/MAX8864 die junction and the surrounding air,
and θJA is the thermal resistance of the chosen package
to the surrounding air.
The GND pin of the MAX8863/MAX8864 performs the
dual function of providing an electrical connection to
ground and channeling heat away. Connect the GND pin
to ground using a large pad or ground plane.
Reverse Battery Protection
The MAX8863/MAX8864 have a unique protection
scheme that limits the reverse supply current to less than
1mA when either VIN or VSHDN falls below ground. The
circuitry monitors the polarity of these two pins,
disconnecting the internal circuitry and parasitic diodes
when the battery is reversed. This feature prevents the
device from overheating and damaging the battery.
VIN > 5.5V Minimum Load Current
When operating the MAX8863/MAX8864 with an input
voltage above 5.5V, a minimum load current of 20μA is
required to maintain regulation in preset voltage mode.
When setting the output with external resistors, the
minimum current through the external feedback resistors
and load must be 30μA.
Applications Information
Capacitor Selection and Regulator Stability
Normally, use a 1μF capacitor on the input and a 1μF
capacitor on the output of the MAX8863/MAX8864.
Larger input capacitor values and lower ESR provide
better supply-noise rejection and transient response. A
higher-value input capacitor (10μF) may be necessary
if large, fast transients are anticipated and the device is
located several inches from the power source. Improve
load-transient response, stability, and power-supply rejection
by using large output capacitors. For stable operation
over the full temperature range, with load currents up to
120mA, a minimum of 1μF is recommended.
Noise
The MAX8863/MAX8864 exhibit 350μVRMS noise during
normal operation. When using the MAX8863/MAX8864
in applications that include analog-to-digital converters
of greater than 12 bits, consider the ADC’s power-supply
rejection specifications (see the Output Noise DC to
1MHz photo in the Typical Operating Characteristics).
Power-Supply Rejection and Operation
from Sources Other than Batteries
The MAX8863/MAX8864 are designed to deliver low
dropout voltages and low quiescent currents in battery-
powered systems. Power-supply rejection is 62dB at low
frequencies and rolls off above 300Hz. As the frequency
increases above 20kHz, the output capacitor is the major
contributor to the rejection of power-supply noise (see
the Power-Supply Rejection Ratio vs. Ripple Frequency
graph in the Typical Operating Characteristics).
When operating from sources other than batteries,
improve supply-noise rejection and transient response by
increasing the values of the input and output capacitors,
and using passive filtering techniques (see the supply
and load-transient responses in the Typical Operating
Characteristics).
Load Transient Considerations
The MAX8863/MAX8864 load-transient response
graphs (see Typical Operating Characteristics) show two
components of the output response: a DC shift of the
output voltage due to the different load currents, and the
transient response. Typical overshoot for step changes in
the load current from 0mA to 50mA is 12mV. Increasing
the output capacitor’s value and decreasing its ESR
attenuates transient spikes.
MAX8863T/S/R,
MAX8864T/S/R
Low-Dropout, 120mA Linear Regulators
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Input-Output (Dropout) Voltage
A regulator’s minimum input-output voltage differential
(or dropout voltage) determines the lowest usable supply
voltage. In battery-powered systems, this will determine the
useful end-of-life battery voltage. Because the MAX8863/
MAX8864 use a pMOSFET pass transistor, their dropout
voltage is a function of RDS(ON) multiplied by the load
current (see Electrical Characteristics). PACKAGE
TYPE
PACKAGE
CODE
OUTLINE
NO.
LAND
PATTERN NO.
5 SOT23 U5+1 21-0057 90-0174
MAX8863T/S/R,
MAX8864T/S/R
Low-Dropout, 120mA Linear Regulators
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Package Information
For the latest package outline information and land patterns
(footprints), go to www.maximintegrated.com/packages. Note
that a “+”, “#”, or “-” in the package code indicates RoHS status
only. Package drawings may show a different suffix character, but
the drawing pertains to the package regardless of RoHS status.
REVISION
NUMBER
REVISION
DATE DESCRIPTION PAGES
CHANGED
3 5/11 Added lead-free designation and updated continuous power dissipation and
θJA specs 1, 2
4 7/12 Corrected units for TOC 7 4
5 4/13 Updated Ordering Information and Electrical Characteristics tables 1, 3
6 5/16 Updating Ordering Information table 1
Maxim Integrated cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim Integrated product. No circuit patent licenses
are implied. Maxim Integrated reserves the right to change the circuitry and specications without notice at any time. The parametric values (min and max limits)
shown in the Electrical Characteristics table are guaranteed. Other parametric values quoted in this data sheet are provided for guidance.
Maxim Integrated and the Maxim Integrated logo are trademarks of Maxim Integrated Products, Inc. © 2016 Maxim Integrated Products, Inc.
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MAX8863T/S/R,
MAX8864T/S/R
Low-Dropout, 120mA Linear Regulators
Revision History
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim Integrated’s website at www.maximintegrated.com.
