MIC5238
Micrel
MIC5238
Ultra-Low Quiescent Current, 150mA
µ
Cap LDO Regulator
General Description
The MIC5238 is an ultra-low voltage output, 150mA LDO
regulator. Designed to operate in a single supply or dual
supply mode, the MIC5238 consumes only 23µA of bias
current, improving efficiency. When operating in the dual
supply mode, the efficiency greatly improves as the higher
voltage supply is only required to supply the 23µA bias
current while the output and base drive comes off of the much
lower input supply voltage.
As a
µCap
regulator, the MIC5238 operates with a 2.2µF
ceramic capacitor on the output, offering a smaller overall
solution. It also incorporates a logic-level enable pin that
allows the MIC5238 to be put into a zero off-current mode
when disabled.
The MIC5238 is fully protected with current limit and thermal
shutdown. It is offered in the IttyBitty™ SOT-23-5 package
with an operating junction temperature range of
–40°C to +125°C.
Features
•
•
•
•
•
•
•
•
•
•
•
•
•
•
Ultra-low input voltage range: 1.5V to 6V
Ultra-low output voltage: 1.1V minimum output voltage
Low dropout voltage: 310mV at 150mA
High output accuracy:
±2.0%
over temperature
µCap:
stable with ceramic or tantalum capacitors
Excellent line and load regulation specifications
Zero shutdown current
Reverse leakage protection
Thermal shutdown and current limit protection
IttyBitty™ SOT-23-5 package
PDAs and pocket PCs
Cellular phones
Battery powered systems
Low power microprocessor power supplies
Applications
Ordering Information
Part Number
MIC5238-1.1BM5
MIC5238-1.3BM5
MIC5238-1.1BD5
MIC5238-1.3BD5
Marking
L411
L413
N411
N413
Voltage*
1.1V
1.3V
1.1V
1.3V
Junction Temp. Range
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
Package*
SOT-23-5
SOT-23-5
TSOT-23-5
TSOT-23-5
* For other voltages and package option contact the factory
Typical Application
MIC5238-1.0BM5
V
IN
=1.5V
EN
OFF
ON
1
5
C
IN
2
3
4
1.0V
C
OUT
=2.2µF
ceramic
V
BIAS
=2.5V
C
BIAS
Ultra-Low Voltage Application
IttyBitty is a trademark of Micrel, Inc.
Micrel, Inc. • 1849 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 944-0970 • http://www.micrel.com
August 2003
1
MIC5238
MIC5238
Micrel
Pin Configuration
EN GND IN
3
2
1
EN GND IN
3
2
1
L4xx
4
5
4
N4xx
5
BIAS
OUT
BIAS
OUT
SOT-23-5 (M5)
TSOT-23-5 (D5)
Pin Description
SOT-23-5
1
2
3
4
5
Pin Name
IN
GND
EN
BIAS
OUT
Pin Function
Supply Input
Ground
Enable (Input): Logic low = shutdown; logic high = enable. Do no leave
open.
BiasSupply Input
Regulator Output
MIC5238
2
August 2003
MIC5238
Micrel
Absolute Maximum Ratings
(Note 1)
Input Supply Voltage ........................................ –0.3V to 7V
BIAS Supply Voltage ........................................ –0.3V to 7V
Enable Input Voltage ........................................ –0.3V to 7V
Power Dissipation .................................... Internally Limited
Junction Temperature .............................. –40°C to +125°C
Storage Temperature ............................... –65°C to +150°C
ESD Rating, >1.5µA HBM,
Note 3
Operating Ratings
(Note 2)
Input Supply Voltage .......................................... 1.5V to 6V
BIAS Supply Voltage .......................................... 2.3V to 6V
Enable Input Voltage ............................................. 0V to 6V
Junction Temperature (T
J
) ....................... –40°C to +125°C
Package Thermal Resistance
SOT-23-5
(θ
JA
) .................................................. 235°C/W
Electrical Characteristics
(Note 4)
T
A
= 25°C with V
IN
= V
OUT
+ 1V; V
BIAS
= 3.3V; I
OUT
= 100µA; V
EN
= 2V,
Bold
values indicate –40°C < T
J
< +125°C; unless otherwise specified.
Parameter
Output Voltage Accuracy
Line Regulation
Input Line Regulation
Load Regulation
Dropout Voltage
Condition
Variation from nominal V
OUT
V
BIAS
= 2.3V to 6V,
Note 5
V
IN
= (V
OUT
+ 1V) to 6V
Load = 100µA to 150mA
I
OUT
= 100µA
I
OUT
= 50mA
I
OUT
= 100mA
I
OUT
= 150mA
BIAS Current,
Note 6
Input Current,
Pin 1
I
OUT
= 100µA
I
OUT
= 100µA
I
OUT
= 50mA,
Note 7
I
OUT
= 100mA
I
OUT
= 150mA
V
EN
≤
0.2V; V
IN
= 6V; V
BIAS
= 6V
V
EN
= 0V; V
IN
= 6V; V
BIAS
= 6V
Short Circuit Current
Reverse Leakage
Enable Input
Input Low Voltage
Input High Voltage
Enable Input Current
Note 1.
Note 2.
Note 3.
Note 4.
Note 5.
Note 6.
Note 7.
Min.
–1.5
–2
Typ.
Max.
+1.5
+2
Units
%
%
%
%
0.25
0.04
0.7
50
230
270
310
23
7
0.35
1
2
1.5
0.5
350
5
0.5
1
300
400
%
mV
mV
mV
mV
mV
mV
mV
µA
µA
mA
mA
mA
µA
µA
450
500
20
2.5
5
Ground Current in Shutdown
V
OUT
= 0V
V
IN
= 0V; V
EN
= 0V; V
OUT
= nom V
OUT
Regulator OFF
Regulator ON
V
EN
= 0.2V; Regulator OFF
V
EN
= 2.0V; Regulator ON
2.0
–1.0
500
mA
µA
0.2
V
V
µA
µA
0.01
0.1
1.0
1.0
Exceeding the absolute maximum rating may damage the device.
The device is not guaranteed to function outside its operating rating.
Devices are ESD sensitive. Handling precautions recommended. Human body model, 1.5k in series with 100pF.
Specification for packaged product only.
Line regulation measures a change in output voltage due to a change in the bias voltage.
Current measured from bias input to ground.
Current differential between output current and main input current at rated load current.
August 2003
3
MIC5238
MIC5238
Micrel
Typical Characteristics
80
70
60
PSRR (dB)
PSRR
150mA Load
OUTPUT VOLTAGE (V)
1.2
1.1
1
0.9
0.8
0.7
0.6
0.5
Output Voltage
vs. V
BIAS
100µA
150mA
OUTPUT VOLTAGE (V)
1.15
1.1
1.05
1
0.95
0.9
0.85
Output Voltage
vs. V
IN
100µA
150mA
50
40
30
C
OUT
= 2.2µF ceramic
V
IN
= 2.1V
10 V
= 1.1V
OUT
20
0
10
100 1k 10k 100k 1M 10M
FREQUENCY (Hz)
0.4
1.2 1.7 2.2 2.7 3.2 3.7 4.2 4.7 5.2
INPUT BIAS (V)
0.8
1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 1.9 2 2.1
INPUT V
IN
(V)
400
DROPOUT VOLTAGE (mV)
Dropout Voltage
vs. Load
V
IN
= V
OUT
+ 1
GROUND CURRENT (µA)
1800
1600
1400
1200
1000
800
600
400
200
0
0
Ground Current (V
IN
)
vs. Output Current
V
IN
GROUND CURRENT (mA)
V
IN
= V
OUT
+ 1
2.0
Ground Current (V
IN
)
vs. V
IN
Supply
350
300
250
200
150
100
50
0
0
1.1V
1.8 150mA
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
0
25 50 75 100 125 150
OUTPUT CURRENT (A)
25 50 75 100 125 150
OUTPUT CURRENT (mA)
0.5
1.0
1.5
V
IN
SUPPLY (V)
2.0
30
GROUND CURRENT (µA)
25
20
15
10
5
0
0
Ground Current (V
BIAS
)
vs. Output Current
V
BIAS
GROUND CURRENT (µA)
V
IN
= V
OUT
+ 1
Ground Current (V
BIAS
)
vs. Input Voltage
30
25
20
15
10
5
0
0
0.5
1
1.5
2
2.5
3
I
LOAD
= 150mA
GROUND CURRENT (µA)
7
6
5
4
3
2
1
0
0
Shutdown Current of
V
IN
No Load
25 50 75 100 125 150
OUTPUT CURRENT (mA)
0.5
1
1.5
2
INPUT VOLTAGE (V)
ENABLE (V)
Shutdown Current of V
BIAS
20
GROUND CURRENT (mA)
GROUND CURRENT (mA)
Shutdown Current
V
BIAS
+ V Tied
IN
V
IN
GROUNF CURRENT (µA)
30
No Load
25
20
15
10
5
0
0
0.5
1
1.5
ENABLE (V)
2
10
9
8
7
6
5
4
3
2
1
Ground Current (V
IN
)
vs Temperature
1.1V
100µA
18 No Load
16
14
12
10
8
6
4
2
0
0
0.5
1
1.5
ENABLE (V)
2
0
-40 -20 0 20 40 60 80 100 120
TEMPERATURE (°C)
MIC5238
4
August 2003
MIC5238
Micrel
V
IN
GROUND CURRENT (mA)
V
IN
GROUND CURRENT (mA)
1.4
1.2
1
0.8
0.6
0.4
0.2
0
-40 -20 0 20 40 60 80 100 120
TEMPERATURE (°C)
1.8
1.6
1.4
1.2
1
0.8
0.6
0.4
-40 -20 0 20 40 60 80 100 120
TEMPERATURE (°C)
V
IN
GROUND CURRENT (µA)
1.1V
1.8 75mA
1.6
2
V
IN
Ground Current
vs. Temperature
2.4
V
IN
Ground Current
vs. Temperature
40
V
BIAS
1.1V
2.2 150mA
2
Ground Current
vs. Temperature
1.1V
35 100µA
30
25
20
15
10
5
0
-40 -20 0 20 40 60 80 100 120
TEMPERATURE (°C)
V
BIAS
Ground Current
vs. Temperature
40
V
IN
GROUND CURRENT (µA)
V
BIAS
Ground Current
vs. Temperature
40
V
IN
GROUND CURRENT (µA)
OUTPUT VOLTAGE (V)
35
30
25
20
15
10
5
1.1V
75mA
35
30
25
20
15
10
5
1.1V
150mA
1.1025
Output Voltage
vs. Temperature
1.1V
1.1020 100µA
1.1015
1.1010
1.1005
1.1000
1.0995
1.0990
1.0985
1.0980
1.0975
-40 -20 0 20 40 60 80 100 120
TEMPERATURE (°C)
0
-40 -20 0 20 40 60 80 100 120
TEMPERATURE (°C)
0
-40 -20 0 20 40 60 80 100 120
TEMPERATURE (°C)
500
450
LOAD CURRENT (mA)
Short Circuit Current
vs. Temperature
DROPOUT VOLTAGE (mV)
500
450
400
350
300
250
200
150
100
50
Dropout Voltage
vs. Temperature
Load = 150mA
400
350
300
250
200
150
100
50
0
-40 -20 0 20 40 60 80 100 120
TEMPERATURE (°C)
0
-40 -20 0 20 40 60 80 100 120
TEMPERATURE (°C)
August 2003
5
MIC5238
PCB设计
