MIC5350
Dual 300mA/500mA LDO
in 2mm x 2mm Thin MLF®
ULDO is a trademark of Micrel, Inc
MLF and MicroLeadFrame are registered trademarks of Amkor Technology, Inc.
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
June 2010 M9999-060410
General Description
The MIC5350 is a tiny Dual Ultra Low-Dropout (ULDO™)
linear regulator ideally suited for portable electronics due
to its low output noise. The MIC5350 integrates two high-
performance; 300mA (VOUT1) and 500mA (VOUT2) ULDOs™
into a tiny 2mm x 2mm leadless Thin MLF® package,
which provides exceptional thermal characteristics.
The MIC5350 is designed to be stable with small ceramic
output capacitors thereby reducing required board space
and component cost. The combination of extremely low-
drop-out voltage, low output noise and exceptional thermal
package characteristics makes it ideal for powering RF
and noise-sensitive circuitry, cellular phone camera
modules, imaging sensors for digital still cameras, PDAs,
MP3 players and WebCam applications.
The MIC5350 ULDO™ is available in fixed-output voltages
in the tiny 8-pin 2mm x 2mm leadless Thin MLF® package
which occupies less than half the board area of a single
SOT23-6 package. Additional voltage options are
available. For more information, contact Micrel marketing.
Data sheets and support documentation can be found on
Micrel’s web site at www.micrel.com.
Features
• 2.6V to 5.5V input voltage range
• Ultra-low dropout voltage: 75mV @ 300mA and 125mV
@ 500mA
• Ultra-low output noise: 30µVRMS
• ±2% initial output accuracy
• Tiny 8-pin 2mm x 2mm Thin MLF® leadless package
• Excellent Load/Line transient response
• Fast start-up time: 30µs
• µCap stable with 2.2µF ceramic capacitors
• Thermal shutdown protection
• Low quiescent current: 130µA with both outputs at
maximum load
• Current-limit protection
Applications
• Mobile phones
• PDAs
• GPS receivers
• Portable electronics
• Portable media players
• Digital still and video cameras
_________________________________________________________________________________________________________________________
Typical Application
RF Power Supply Circuit
Micrel, Inc. MIC5350
June 2010 2 M9999-060410
Block Diagram
Micrel, Inc. MIC5350
June 2010 3 M9999-060410
Ordering Information
Voltage(V)
Part Number Manufacturing
Part Number Marking VOUT1 V
OUT2
Junction Temperature
Range Package
MIC5350-2.8/1.8YMT MIC5350-MGYMT FMG 2.8V 1.8V –40°C to +125°C 8-Pin 2x2 TMLF®
MIC5350-2.8/2.8YMT MIC5350-MMYMT FMM 2.8V 2.8V –40°C to +125°C 8-Pin 2x2 TMLF®
MIC5350-3.0/1.8YMT MIC5350-PGYMT FPG 3.0V 1.8V –40°C to +125°C 8-Pin 2x2 TMLF®
MIC5350-3.3/1.8YMT MIC5350-SGYMT FSG 3.3V 1.8V –40°C to +125°C 8-Pin 2x2 TMLF®
MIC5350-3.3/2.8YMT MIC5350-SMYMT FSM 3.3V 2.8V –40°C to +125°C 8-Pin 2x2 TMLF®
Notes
1. Pin 1 identifier= “▲”.
2. For other voltage options contact Micrel Marketing.
3. Thin MLF® is a GREEN RoHS compliant package. Lead finish is NiPdAu, Mold compound is Halogen Free.
Pin Configuration
8-Pin 2mm x 2mm TMLF (MT)
TOP VIEW
Pin Description
Pin Number Pin Name Pin Function
1 VIN Supply Input.
2 GND Ground.
3 BYP
Reference Bypass: Connect external 0.1µF to GND to reduce output noise.
May be left open when bypass capacitor is not required.
4 EN2
Enable Input (regulator 2). Active High Input. Logic High = On; Logic Low = Off;
Do not leave floating.
5 EN1
Enable Input (regulator 1). Active High Input. Logic High = On; Logic Low = Off;
Do not leave floating.
6 NC Not internally connected.
7 VOUT2 Regulator Output – LDO2 (500mA output).
8 VOUT1 Regulator Output – LDO1 (300mA output).
EPAD HS Pad Heatsink Pad internally connected to ground.
Micrel, Inc. MIC5350
June 2010 4 M9999-060410
Absolute Maximum Ratings(1)
Supply Voltage (VIN)........................................ −0.3V to +6V
Enable Input Voltage (VEN1 , VEN2).....................−0.3V to VIN
Power Dissipation ..................................Internally Limited(3)
Lead Temperature (soldering, 3sec).......................... 260°C
Storage Temperature (TS).........................−65°C to +150°C
ESD Rating(4) ................................................................. 2kV
Operating Ratings(2)
Supply Voltage (VIN)..................................... +2.6V to +5.5V
Enable Input Voltage (VEN1, VEN2) .......................... 0V to VIN
Junction Temperature ............................... –40°C to +125°C
Junction Thermal Resistance
8-Pin 2mm x 2mm Thin MLF® (θJA) ...................90°C/W
Electrical Characteristics(5)
VIN = VEN1 = VEN2 = VOUT + 1.0V; higher of the two regulator outputs, IOUTLDO1 = IOUTLDO2 = 100µA; COUT1 = COUT2 = 2.2µF; CBYP = 0.1µF;
TJ = 25°C, bold values indicate –40°C ≤ TJ ≤ +125°C, unless noted.
Parameter Conditions Min. Typ. Max. Units
Variation from nominal VOUT -2.0 +2.0
Output Voltage Accuracy Variation from nominal VOUT; –40°C to +125°C -3.0 +3.0 %
Line Regulation VIN = VOUT + 1V to 5.5V; IOUT = 100µA 0.05 0.3
0.6 %/V
Load Regulation IOUT1, 2 = 100µA to 300mA
IOUT2 =100µA to 500mA 0.5
0.7
2.0
2.5 %
Dropout Voltage(6)
IOUT1, 2 = 100µA
IOUT1, 2 = 50mA
IOUT1, 2 = 300mA
IOUT2 = 500mA
0.1
12
75
125
50
200
300
mV
Ground Current
VEN1 ≥ 1.2V; VEN2 ≤ 0.2V; IOUT = 0mA to 300mA
VEN1 ≤ 0.2V; VEN2 ≥ 1.2V; IOUT2 = 0mA to 500mA
VEN1 = VEN2 = 1.2V; IOUT1 = 300mA, IOUT2 = 500mA
95
95
130
175
175
240
µA
Ground Current in Shutdown VEN1 = VEN2 = 0V 0.01 2 µA
Ripple Rejection f = 1kHz; COUT = 2.2µF; CBYP = 0.1µF
f = 20kHz; COUT = 2.2µF; CBYP = 0.1µF 50
35 dB
VOUT1 = 0V 350 560 850
Current Limit
VOUT2 = 0V 550 950 1500 mA
Output Voltage Noise COUT = 2.2µF; CBYP = 0.1µF; 10Hz to 100kHz 30 µVRMS
Enable Inputs (EN1 / EN2)
Logic Low 0.2
Enable Input Voltage Logic High 1.2
V
VIL ≤ 0.2V 0.01
Enable Input Current VIH ≥ 1.2V 0.01 µA
Turn-on Time (See Timing Diagram)
Turn-on Time (LDO1 and 2) COUT = 2.2µF; CBYP = 0.01µF 30 100 µs
Notes:
1. Exceeding the absolute maximum rating may damage the device.
2. The device is not guaranteed to function outside its operating rating.
3. The maximum allowable power dissipation of any TA (ambient temperature) is PD(max) = (TJ(max) – TA) / θJA. Exceeding the maximum allowable
power dissipation will result in excessive die temperature, and the regulator will go into thermal shutdown.
4. Devices are ESD sensitive. Handling precautions recommended. Human body model 1.5kΩ in series with 100pF.
5. Specification for packaged product only.
6. Dropout voltage is defined as the input-to-output differential at which the output voltage drops 2% below its nominal VOUT. For outputs below
2.6V, the dropout voltage is the input-to-output differential with the minimum input voltage 2.6V.
Micrel, Inc. MIC5350
Typical Characteristics
Ground Current
vs. Output Current
80
85
90
95
100
0 100 200 300 400 500
OUTPUT CURRENT (mA)
Ground Current
vs. Temperature
90
95
100
105
110
115
120
125
130
135
140
-40 -20 0 20 40 60 80 100 120 140
TEMPERATURE (°C)
Output Voltage
vs. Input Voltage
1.4
1.6
1.8
2
2.2
2.4
2.6
2.8
3
3.2
3.4
3.6
2.533.544.555.5
INPUT VOLTAGE (V)
GROUND CURRENT (μA)
I
OUT1
= 300mA and I
OUT2
= 500mA
100μA
GROUND CURRENT (μA)
OUTPUT VOLTAGE (V)
300mA
I
OUT1
= 300mA
V
OUT2
= 2.8V
V
IN
= 4.3V
V
OUT1
= 3.3V
C
IN
= C
OUT
= 2.2µF
I
OUT2
= 500mA
Output Voltage
vs. Input Voltage
1.4
1.6
1.8
2
2.2
2.4
2.6
2.8
3
2.533.544.555.5
INPUT VOLTAGE (V)
Current Limit
vs. Input Voltage
400
500
600
700
800
900
1000
2.5 3 3.5 4 4.5 5 5.5
Input Voltage(V)
Dropout Voltage vs.
Temperature
0
20
40
60
80
100
120
140
160
180
-40 -20 0 20 40 60 80 100 120
TEMPERATURE (°C)
June 2010 5 M9999-060410
OUTPUT VOLTAGE (V)
500mA
100μA
DROPOUT VOLTAGE (mV)
V
OUT2
= 500mA
V
OUT2
Current Limit (mA)
V
OUT1, 2
= 300mA
V
OUT1
V
OUT2
= 2.8V
C
IN
= C
OUT
= 2.2µF
V
OUT1, 2
= 150mA
Dropout Voltage vs.
Output Current
0
20
40
60
80
100
120
140
0 50 100 150 200 250 300 350 400 450 500
DROPOUT VOLTAGE (mV)
OUTPUT CURRENT (mA)
V
OUT2
= 2.8V
V
EN1
= 0.0V
Output Voltage vs.
Output Current
2.4
2.6
2.8
3
3.2
3.4
3.6
0 50 100 150 200 250 300 350 400 450 500
OUTPUT VOLTAGE (V)
OUTPUT CURRENT (mA)
V
OUT1
V
OUT2
V
IN
= 4.3V
C
IN
= C
OUT
= 2.2μF
Output Noise Spectral Density
0.001
0.01
0.1
1
10
10 100 1,000 10,000 100,000 1,000,000 10,000,000
NOISE μV/√Hz
FREQUENCY (Hz)
V
IN
= 4.5V
C
OUT
= 2.2μF
V
OUT1
= 2.8V
I
LOAD
= 75mA
Micrel, Inc. MIC5350
June 2010 6 M9999-060410
Typical Characteristics (Continued)
Power Supply
Rejection Ratio
-100
-90
-80
-70
-60
-50
-40
-30
-20
-10
0
10 100 1,000 10,000 100,000 1,000,000 10,000,000
PSRR (dB)
FREQUENCY (Hz)
10 0 u A
500mA
300mA
V
IN
= 3.8V
V
OUT2
= 3.3V
C
OUT
= 2.2μF
C
BYP
= 0.1μF
Micrel, Inc. MIC5350
June 2010 7 M9999-060410
Functional Characteristics
Micrel, Inc. MIC5350
June 2010 8 M9999-060410
Applications Information
Enable/Shutdown
The MIC5350 comes with dual active-high enable pins
that allow each regulator to be enabled independently.
Forcing both enable pins low disables the regulators and
sends it into a “zero” off-mode-current state. In this state,
current consumed by the regulator goes nearly to zero.
Forcing the enable pin high enables the output voltage.
The active-high enable pin uses CMOS technology and
the enable pin cannot be left floating; a floating enable
pin may cause an indeterminate state on the output.
Input Capacitor
The MIC5350 is a high-performance, high-bandwidth
device. Therefore, it requires a well-bypassed input
supply for optimal performance. A 2.2µF capacitor is
required from the input to ground to provide stability.
Low-ESR ceramic capacitors provide optimal
performance at a minimum of space. Additional high-
frequency capacitors, such as small-valued NPO
dielectric-type capacitors, help filter out high-frequency
noise and are good practice in any RF-based circuit.
Output Capacitor
The MIC5350 requires an output capacitor of 2.2µF or
greater to maintain stability. The design is optimized for
use with low-ESR ceramic chip capacitors. High-ESR
capacitors may cause high-frequency oscillation. The
output capacitor can be increased, but performance has
been optimized for a 2.2µF ceramic output capacitor and
does not improve significantly with larger capacitance.
X7R/X5R dielectric-type ceramic capacitors are
recommended because of their superior temperature
performance. X7R-type capacitors change capacitance
by 15% over their operating temperature range and are
the most stable type of ceramic capacitors. Z5U and
Y5V dielectric capacitors change value by as much as
50% and 60%, respectively, over their operating
temperature ranges. To use a ceramic-chip capacitor
with Y5V dielectric, the value must be much higher than
an X7R ceramic capacitor to ensure the same minimum
capacitance over the equivalent operating temperature
range.
Bypass Capacitor
A capacitor can be placed from the noise bypass pin-to-
ground to reduce output voltage noise. The capacitor
bypasses the internal reference. A 0.1µF capacitor is
recommended for applications that require low-noise
outputs. The bypass capacitor can be increased, further
reducing noise and improving PSRR. Turn-on time
increases slightly with respect to bypass capacitance.
A unique, quick-start circuit allows the MIC5350 to drive
a large capacitor on the bypass pin without significantly
slowing turn-on time.
No-Load Stability
Unlike many other voltage regulators, the MIC5350 will
remain stable with no load. This is especially important
in CMOS RAM keep-alive applications.
Thermal Considerations
The MIC5350 is designed to provide 300mA of
continuous current for VOUT1 and 500mA for VOUT2 in a
very small package. Maximum ambient operating
temperature can be calculated based on the output
current and the voltage drop across the part. Given that
the input voltage is 3.3V, the output voltage is 2.8V for
VOUT1, 2.8V for VOUT2 and the output current 300mA and
500mA respectively. The actual power dissipation of the
regulator circuit can be determined using the equation:
PD = (VIN – VOUT1) IOUT1 + (VIN – VOUT2) IOUT2+ VIN
IGND
Because this device is CMOS and the ground current is
typically <100µA over the load range, the power
dissipation contributed by the ground current is < 1%
and can be ignored for this calculation.
PD = (3.3V – 2.8V) × 300mA + (3.3V -2.8) ×
500mA
PD = 0.4W
To determine the maximum ambient operating
temperature of the package, use the junction-to-ambient
thermal resistance of the device and the following basic
equation:
PD(MAX) =
TJ(MAX) - TA
JA
⎝
⎛
TJ(max) = 125°C, the maximum junction temperature of
the die θJA thermal resistance = 90°C/W.
Micrel, Inc. MIC5350
June 2010 9 M9999-060410
Thermal Resistance
Substituting PD for PD(max) and solving for the ambient
operating temperature will give the maximum operating
conditions for the regulator circuit. The junction-to-
ambient thermal resistance for the minimum footprint is
90°C/W.
The maximum power dissipation must not be exceeded
for proper operation.
For example, when operating the MIC5350-MMYMT at
an input voltage of 3.3V with 300mA on VOUT1 and
500mA on VOUT2 and a minimum footprint layout, the
maximum ambient operating temperature TA can be
determined as follows:
0.4W = (125°C – TA)/(90°C/W)
TA = 89°C
Therefore, a 2.8V/2.8V application with 300mA and
500mA output currents can accept an ambient operating
temperature of 89°C in a 2mm x 2mm Thin MLF®
package. For a full discussion of heat sinking and
thermal effects on voltage regulators, refer to the
“Regulator Thermals” section of Micrel’s Designing with
Low-Dropout Voltage Regulators handbook. This
information can be found on Micrel's website at:
http://www.micrel.com/_PDF/other/LDOBk_ds.pdf
Micrel, Inc. MIC5350
June 2010 10 M9999-060410
Typical Application Schematic
Bill of Materials
Item Part Number Manufacturer Description Qty.
C1 C1608X5R0J106M TDK(1) Capacitor, 10µF Ceramic, 6.3V, X5R, Size 0603 1
C2 VJ0603Y104KXQ Vishay(2) Capacitor, 0.1µF Ceramic, 10V, X7R, Size 0603 1
C3, C4 C1608X5R0J225M TDK(1) Capacitor, 2.2µF Ceramic, 6.3V, X5R, Size 0603 2
R1, R2 CRCW06031002FKEYE3 Vishay(2) Resistor, 10kΩ, 1%, 1/16W, Size 0603 2
U1 MIC5350-XXYML Micrel, Inc.(3) Dual 300mA/500mA LDO, 2mm x 2mm Thin MLF® 1
Notes:
1. TDK: www.tdk.com.
2. Vishay Tel: www.vishay.com.
3. Micrel, Inc.: www.micrel.com.
Micrel, Inc. MIC5350
June 2010 11 M9999-060410
PCB Layout Recommendations
TOP LAYER
BOTTOM LAYER
Micrel, Inc. MIC5350
Package Information
8-Pin 2mm x 2mm TMLF (MT)
MICREL, INC. 2180 FORTUNE DRIVE SAN JOSE, CA 95131 USA
TEL +1 (408) 944-0800 FAX +1 (408) 474-1000 WEB http://www.micrel.com
The information furnished by Micrel in this data sheet is believed to be accurate and reliable. However, no responsibility is assumed by Micrel for its
use. Micrel reserves the right to change circuitry and specifications at any time without notification to the customer.
Micrel Products are not designed or authorized for use as components in life support appliances, devices or systems where malfunction of a product
reasonably be expected to result in personal injury. Life support devices or systems are devices or systems that (a) are intended for surgical impla
into the body or (b) support or sustain life, and whose failure to perform can be reasonably expected to result in a significant injury to the user. A
Purchaser’s use or sale of Micrel Products for use in life support appliances, devices or systems is a Purchaser’s own risk and Purchaser agrees to fully
indemnify Micrel for any damages resulting from such use or sale.
can nt
© 2010 Micrel, Incorporated.
June 2010 12 M9999-060410
