August 2003
1
MIC5235
MIC5235
Micrel
MIC5235
Ultra-Low Quiescent Current, 150mA
Cap LDO Regulator
General Description
The MIC5235 is a 150mA highly accurate, low dropout
regulator with high input voltage and ultra-low ground current.
This combination of high voltage and low ground current
makes the MIC5235 ideal for USB and portable electronics
applications, using 1-cell, 2-cell or 3-cell Li-Ion battery inputs.
A
Cap LDO design, the MIC5235 is stable with either
ceramic or tantalum output capacitor. It only requires a 2.2
F
capacitor for stability.
Features of the MIC5235 includes enable input, thermal
shutdown, current limit, reverse battery protection, and
reverse leakage protection.
Available in fixed and adjustable output voltage versions, the
MIC5235 is offered in the IttyBittyTM SOT-23-5 package with
a junction temperature range of 40
C to +125
C.
Micrel, Inc. 1849 Fortune Drive San Jose, CA 95131 USA tel + 1 (408) 944-0800 fax + 1 (408) 944-0970 http://www.micrel.com
IttyBitty is a trademark of Micrel, Inc.
Features
Wide input voltage range: 2.3V to 24V
Ultra low ground current: 18
A
Low dropout voltage: 310mV at 150mA
High output accuracy:
2.0% over temperature
Cap: stable with ceramic or tantalum capacitors
Excellent line and load regulation specifications
Zero shutdown current
Reverse battery protection
Reverse leakage protection
Thermal shutdown and current limit protection
IttyBittyTM SOT-23-5 package
Applications
USB power supply
Cellular phones
Keep-alive supply in notebook and portable computers
Logic supply for high-voltage batteries
Automotive electronics
Battery powered systems
Typical Application
1
5
2
3
4
C
OUT
=2.2
F
ceramic
I
GND
=18
A
C
IN
=1.0
F
EN
MIC5235BM5
V
IN
V
OUT
=1.8V
R
1
R
2
OFF ON
Ultra-Low Current Adjustable Regulator Application
Ordering Information
Part Number
Marking
Voltage
Junction Temp. Range
Package
MIC5235-1.5BM5
L215
1.5V
40
C to +125
C
SOT-23-5
MIC5235-1.8BM5
L218
1.8V
40
C to +125
C
SOT-23-5
MIC5235-2.5BM5
L225
2.5V
40
C to +125
C
SOT-23-5
MIC5235-2.7BM5
L227
2.7V
40
C to +125
C
SOT-23-5
MIC5235-3.0BM5
L230
3.0V
40
C to +125
C
SOT-23-5
MIC5235-3.3BM5
L233
3.3V
40
C to +125
C
SOT-23-5
MIC5235-5.0BM5
L250
5.0V
40
C to +125
C
SOT-23-5
MIC5235BM5
L2AA
ADJ.
40
C to +125
C
SOT-23-5
Ground Current vs. Input Voltage
10
15
20
25
30
35
40
4
9
14
19
24
GROUND CURRENT (
A)
INPUT VOLTAGE (V)
I
OUT
= 10
A
I
OUT
= 1mA
I
OUT
= 100
A
August 2003
3
MIC5235
MIC5235
Micrel
Electrical Characteristics
(Note 4)
T
A
= 25
C with V
IN
= V
OUT
+ 1V; I
OUT
= 100
A , Bold values indicate 40
C < T
J
< +125
C; unless otherwise specified.
Parameter
Condition
Min.
Typ.
Max.
Units
Output Voltage Accuracy
Variation from nominal V
OUT
1.0
+1.0
%
2.0
+2.0
%
Line Regulation
V
IN
= V
OUT
+ 1V to 24V
0.04
%
Load Regulation
Load = 100
A to 150mA
0.25
1
%
Dropout Voltage
I
OUT
= 100
A
50
mV
I
OUT
= 50mA
230
300
mV
400
mV
I
OUT
= 100mA
270
400
mV
450
mV
I
OUT
= 150mA
310
450
mV
500
mV
Ground Current
I
OUT
= 100
A
18
30
A
35
A
I
OUT
= 50mA
0.35
0.7
mA
I
OUT
= 100mA
1
2
mA
I
OUT
= 150mA
2
4
mA
Ground Current in Shutdown
V
EN
0.6V; V
IN
= 24V
0.1
1
A
Short Circuit Current
V
OUT
= 0V
350
500
mA
Output Leakage,
Load = 500
; V
IN
= 15V
0.1
A
Reverse Polarity Input
Enable Input
Input Low Voltage
Regulator OFF
0.6
V
Input High Voltage
Regulator ON
2.0
V
Enable Input Current
V
EN
= 0.6V; Regulator OFF
1.0
0.01
1.0
A
V
EN
= 2.0V; Regulator ON
0.1
1.0
A
V
EN
= 24V; Regulator ON
0.5
2.5
A
Note 1.
Exceeding the absolute maximum rating may damage the device.
Note 2.
The device is not guaranteed to function outside its operating rating.
Note 3.
Devices are ESD sensitive. Handling precautions recommended. Human body model, 1.5k in series with 100pF.
Note 4.
Specification for packaged product only.
Absolute Maximum Ratings
(Note 1)
Input Supply Voltage ....................................... 20V to 38V
Enable Input Voltage ...................................... 0.3V to 38V
Power Dissipation .................................... Internally Limited
Junction Temperature .............................. 40
C to +125
C
Storage Temperature ............................... 65
C to +150
C
ESD Rating, Note 3
Operating Ratings
(Note 2)
Input Supply Voltage ........................................ 2.3V to 24V
Enable Input Voltage ........................................... 0V to 24V
Junction Temperature (T
J
) ....................... 40
C to +125
C
Package Thermal Resistance
SOT-23-5
(
JA
) .................................................. 235
C/W
MIC5235
Micrel
MIC5235
4
August 2003
Typical Characteristics
0
10
20
30
40
50
60
70
0.01
0.1
1
10
100
1000
PSRR (dB)
FREQUENCY (kHz)
Power Supply
Rejection Ratio
I
LOAD
= 150mA
0
50
100
150
200
250
300
350
0
20 40 60 80 100 120 140 160
DROPOUT VOLTAGE (mV)
OUTPUT CURRENT (mA)
Dropout Voltage
vs. Output Current
0
50
100
150
200
250
300
350
400
450
500
-40 -20 0
20 40 60 80 100 120
DROPOUT VOLTAGE (mV)
TEMPERATURE (
C)
Dropout Voltage
vs. Temperature
I
OUT
= 150mA
0
0.5
1
1.5
2
2.5
3
3.5
0 0.5 1 1.5 2 2.5 3 3.5 4
OUTPUT VOLTAGE (V)
INPUT VOLTAGE (V)
Dropout
Characteristics
I
LOAD
= 100
A
I
LOAD
= 75mA
I
LOAD
= 150mA
0
500
1000
1500
2000
2500
3000
0
20 40 60 80 100 120 140 160
GROUND CURRENT (
A)
OUTPUT CURRENT (mA)
Ground Pin Current
vs. Output Current
V
IN
= 4V
10
12
14
16
18
20
22
24
26
28
30
0
100
200
300
400
500
GROUND CURRENT (
A)
OUTPUT CURRENT (
A)
Ground Pin Current
vs. Output Current
V
IN
= 24V
V
IN
= 12V
V
IN
= 4V
40
45
50
55
60
65
70
75
80
-40 -20
0
20 40 60 80 100 120
GROUND CURRENT (
A)
TEMPERATURE (
C)
Ground Pin Current
vs. Temperature
I
LOAD
= 10mA
500
520
540
560
580
600
620
640
660
680
700
-40 -20
0
20 40 60 80 100 120
GROUND CURRENT (
A)
TEMPERATURE (
C)
Ground Pin Current
vs. Temperature
I
LOAD
= 75mA
1.5
1.6
1.7
1.8
1.9
2
2.1
2.2
2.3
2.4
2.5
-40 -20 0
20 40 60 80 100 120
GROUND CURRENT (mA)
TEMPERATURE (
C)
Ground Pin Current
vs. Temperature
I
LOAD
= 150mA
0
10
20
30
40
50
60
70
80
90
100
1.5
2
2.5
3
3.5
4
GROUND CURRENT (
A)
INPUT VOLTAGE (V)
Ground Pin Current
vs. Input Voltage
I
OUT
= 10mA
I
OUT
= 1mA
I
OUT
= 100
A
I
OUT
= 10
A
0.4
0.6
0.8
1
1.2
1.4
1.6
1.8
2
2.2
2.4
1.5
2
2.5
3
3.5
4
GROUND CURRENT (
A)
INPUT VOLTAGE (V)
Ground Pin Current
vs. Input Voltage
I
OUT
=150mA
I
OUT
= 75mA
10
15
20
25
30
35
40
4
9
14
19
24
GROUND CURRENT (
A)
INPUT VOLTAGE (V)
Ground Pin Current
vs. Input Voltage
I
OUT
= 10
A
I
OUT
= 1mA
I
OUT
= 100
A
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