MIC5357
High Performance, Low Noise Dual
500mA ULDO™
General Description
The MIC5357 is a tiny Dual Ultra Low Dropout (ULDO™)
linear regulator ideally suited for portable electronics due
to its low output noise. The MIC5357 provides two
independently controlled high performance 500mA LDOs
with typical dropout voltage of 130mV at rated load. In
addition, the MIC5357 provides a bypass pin to reduce the
output noise.
The MIC5357 is designed to be stable with small ceramic
output capacitors thereby reducing required board space
and component cost. The combination of extremely low
dropout 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 MIC5357 ULDO™ is available in fixed output voltages
in the small 8-pin ePad MSOP 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: 130mV @ 500mA
Ultra low output noise: 51µV
RMS
±2% initial output accuracy
Small 8-pin ePad MSOP package
Excellent Load/Line transient response
Fast start up time: 38µs
µCap stable with 2.2µF ceramic capacitors
Thermal shutdown protection
Low quiescent current: 160µA with both outputs at
maximum load
•
Current-limit protection
Applications
•
•
•
•
•
•
Battery-Powered Applications
PDAs
GPS receivers
Portable electronics
Portable media players
Digital still and video cameras
_________________________________________________________________________________________________________________________
Typical Application
RF Power Supply Circuit
ULDO is a trademark of Micrel, 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
January 2011
M9999-011311
Micrel, Inc.
MIC5357
Block Diagram
January 2011
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M9999-011311
Micrel, Inc.
MIC5357
Ordering Information
Part Number
(1)
MIC5357-3.3/2.8YMME
MIC5357-3.3/1.8YMME
MIC5357-2.8/1.8YMME
MIC5357-1.8/1.5YMME
Notes
1.
For other voltage options contact Micrel Marketing.
Manufacturing Part
Number
MIC5357-SMYMME
MIC5357-SGYMME
MIC5357-MGYMME
MIC5357-GFYMME
Marking
57SM
57SG
57MG
57GF
Voltage(V)
V
OUT1
3.3V
3.3V
2.8V
1.8V
V
OUT2
2.8V
1.8V
1.8V
1.5V
Junction Temperature
Range
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
Package
8-Pin ePAD MSOP
8-Pin ePAD MSOP
8-Pin ePAD MSOP
8-Pin ePAD MSOP
Pin Configuration
8-Pin ePAD MSOP (MME)
TOP VIEW
Pin Description
Pin Number
1
2
3
4
5
6
7
8
ePAD
Pin Name
VIN
GND
BYP
EN2
EN1
NC
VOUT2
VOUT1
HS Pad
Pin Function
Supply Input.
Ground.
Reference Bypass: Connect external 0.1µF to GND to reduce output noise.
May be left open when bypass capacitor is not required.
Enable Input (regulator 2). Active High Input. Logic High = On; Logic Low = Off;
Do not leave floating.
Enable Input (regulator 1). Active High Input. Logic High = On; Logic Low = Off;
Do not leave floating.
Not internally connected.
Regulator Output – LDO2.
Regulator Output – LDO1.
Heatsink Pad internally connected to ground.
January 2011
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Micrel, Inc.
MIC5357
Absolute Maximum Ratings
(1)
Supply Voltage (V
IN
) ........................................
−0.3V
to
+6V
Enable Input Voltage (V
EN1
, V
EN2
).....................−0.3V to V
IN
Power Dissipation ..................................Internally Limited
(3)
Lead Temperature (soldering, 3sec) .......................... 260°C
Storage Temperature (T
S
).........................−65°C to
+150°C
ESD Rating
(4)
................................................................. 2kV
Operating Ratings
(2)
Supply Voltage (V
IN
)..................................... +2.6V to +5.5V
Enable Input Voltage (V
EN1
, V
EN2
) .......................... 0V to V
IN
Junction Temperature ............................... –40°C to +125°C
Junction Thermal Resistance
8-Pin ePAD MSOP (θ
JA
) .................................64.4°C/W
Electrical Characteristics
(5)
V
IN
= V
EN1
= V
EN2
= V
OUT
+ 1.0V; higher of the two regulator outputs, I
OUTLDO1
= I
OUTLDO2
= 100µA; C
OUT1
= C
OUT2
= 2.2µF; C
BYP
= 0.1µF;
T
J
= 25°C,
bold
values indicate –40°C
≤
T
J
≤
+125°C, unless noted.
Parameter
Output Voltage Accuracy
Line Regulation
Load Regulation
Conditions
Variation from nominal V
OUT
Variation from nominal V
OUT
; –40°C to +125°C
V
IN
= V
OUT
+ 1V to 5.5V; I
OUT
= 100µA
I
OUT1&2
=100µA to 500mA
I
OUT1,2
= 100µA
(6)
Min.
-2.0
-3.0
Typ.
Max.
+2.0
+3.0
0.3
0.6
2.5
50
300
175
175
240
2
Units
%
%/V
%
mV
0.05
0.7
0.1
12
130
95
95
160
0.01
70
45
550
550
950
950
51
Dropout Voltage
I
OUT1,2
= 50mA
I
OUT1,2
= 500mA
V
EN1
≥
1.2V; V
EN2
≤
0.2V; I
OUT
= 0mA to 500mA
Ground Current
Ground Current in Shutdown
Ripple Rejection
Current Limit
Output Voltage Noise
Enable Inputs (EN1 / EN2)
Enable Input Voltage
Enable Input Current
V
EN1
≤
0.2V; V
EN2
≥
1.2V; I
OUT2
= 0mA to 500mA
V
EN1
= V
EN2
≥
1.2V; I
OUT1
= 500mA, I
OUT2
= 500mA
V
EN1
= V
EN2
= 0V
f = 1kHz; C
OUT
= 2.2µF; C
BYP
= 0.1µF
f = 20kHz; C
OUT
= 2.2µF; C
BYP
= 0.1µF
V
OUT1
= 0V
V
OUT2
= 0V
C
OUT
= 2.2µF; C
BYP
= 0.1µF; 10Hz to 100kHz
Logic Low
Logic High
V
IL
≤
0.2V
V
IH
≥
1.2V
C
OUT
= 2.2µF; C
BYP
= 0.1µF
1.2
µA
µA
dB
1300
1300
mA
µV
RMS
0.2
0.01
0.01
38
100
V
µA
Turn-on Time (See Timing Diagram)
Turn-on Time (LDO1 and 2)
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 T
A
(ambient temperature) is P
D(max)
= (T
J(max)
– T
A
) /
θ
JA
. 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 V
OUT
. For outputs below
2.6V, the dropout voltage is the input-to-output differential with the minimum input voltage 2.6V.
µs
January 2011
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M9999-011311
Micrel, Inc.
MIC5357
Typical Characteristics
Ground Current
vs. Output Current (V
OUT1
)
100
100
Ground Current
vs. Output Current (V
OUT2
)
180
170
Ground Current vs.
Temperature(Dual Outputs)
I
OUT1
=500mA , I
OUT2
=500mA
GROUND CURRENT (μA)
GROUND CURRENT (μA)
GROUND CURRENT (μA)
160
150
140
130
120
110
100
90
80
70
I
OUT1
=500mA
95
95
90
90
85
V
IN
=4.3V
V
OUT1
=3.3V
C
IN
=C
OUT
=2.2μF
85
V
IN
=4.3V
V
OUT2
=2.8V
C
IN
=C
OUT
=2.2μF
80
0
50 100 150 200 250 300 350 400 450 500
80
-40 -20
0
20
40
60
80 100 120
0
50 100 150 200 250 300 350 400 450 500
OUTPUT CURRENT (mA)
TEMPERATURE (°C)
OUTPUT CURRENT (mA)
Output Voltage
vs. Input Voltage
3.6
3.5
Output Voltage
vs. Input Voltage
3
3.6
3.5
3.4
3.3
3.2
3.1
3
2.9
2.8
2.7
2.6
2.5
0
Output Voltage
vs. Output Current
OUTPUT VOLTAGE (V)
OUTPUT VOLTAGE (V)
3.4
3.3
3.2
3.1
3
2.9
2.8
2.7
2.6
2.5
OUTPUT VOLTAGE (V)
100μA
2.9
2.8
100μA
V
OUT1
V
IN
=4.3V
C
IN
=C
OUT
=2.2μF
V
OUT2
500mA
V
OUT1
=3.3V
C
IN
=C
OUT
=2.2μF
2.7
2.6
2.5
500mA
V
OUT2
=2.8V
C
IN
=C
OUT
=2.2μF
100
200
300
400
500
2.5
3
3.5
4
4.5
5
5.5
2.5
3
3.5
4
4.5
5
5.5
INPUT VOLTAGE (V)
INPUT VOLTAGE (V)
OUTPUT CURRENT (mA)
Dropout Voltage
vs. Temperature
150
C
IN
=C
OUT
=2.2μF
Dropout Voltage
vs. Output Current
1200
120
Current Limit
vs. Input Voltage
1150
V
OUT2
=2.8V
DROPOUT VOLTAGE (mV)
DROPOUT VOLTAGE (mV)
CURRENT LIMIT (mA)
135
120
105
90
75
60
45
30
15
0
500mA
300mA
105
90
75
60
45
30
15
0
0
100
200
V
OUT1
=3.3V
C
IN
=C
OUT
=2.2μF
`
1100
1050
1000
950
900
850
800
C
IN
=C
OUT
=2.2μF
V
OUT1
=3.3V
150mA
50mA
-40
-20
0
20
40
60
80
100
120
300
400
500
2.5
3
3.5
4
4.5
5
5.5
TEMPERATURE (°C)
OUTPUT CURRENT (mA)
INPUT VOLTAGE (V)
Power Supply Rejection Ratio
-90
-80
-70
-60
100µA
150mA
300mA
500mA
Output Noise
Spectral Density
10
1
dB
-50
-40
-30
V
EN1
=V
IN
=4.74V
-20
V
OUT1
=3.3V
C
OUT1
=2.2µF
NOISE (uV/√Hz)
0.1
V
IN
=4.7V
V
OUT2
=1.8V
C
IN
-C
OUT
=2.2
µ
F/6.3V
IL=250mA
Noise Output (10Hz to
100Khz)=51.16µVrms
10
100
1000
10000
100000 1000000
0.01
-10
C
BY P
=0.1µA
0
10
100
1000
10000
100000
0.001
FREQUENCY(Hz)
FREQUENCY (Hz)
January 2011
5
M9999-011311
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