August 2003
1
MIC5233
MIC5233
Micrel
MIC5233
High Input Voltage, Low IQ
Cap LDO Regulator
General Description
The MIC5233 is a 100mA 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 MIC5233 ideal for multi-cell Li-Ion battery
systems.
A
Cap LDO design, the MIC5233 is stable with either
ceramic or tantalum output capacitor. It only requires a 2.2
F
capacitor for stability.
Features of the MIC5233 include enable input, thermal shut-
down, current limit, reverse battery protection, and
reverse leakage protection.
Available in fixed and adjustable output voltage versions, the
MIC5233 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 36V
Ultra low ground current: 18
A
Low dropout voltage of 270mV at 100mA
High output accuracy of
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
Keep-alive supply in notebook and portable computers
USB power supply
Logic supply for high-voltage batteries
Automotive electronics
Battery powered systems
3-4 cell Li-Ion battery input range
Typical Application
1
5
2
3
4
C
OUT
=2.2
F
ceramic
I
GND
=18
A
C
IN
=1.0
F
EN
MIC5233BM5
V
IN
V
OUT
R
1
R
2
OFF ON
Ultra-Low Current Adjustable Regulator Application
Ordering Information
Part Number
Marking
Voltage
Junction Temp. Range
Package
MIC5233-1.8BM5
L318
1.8V
40
C to +125
C
SOT-23-5
MIC5233-2.5BM5
L325
2.5V
40
C to +125
C
SOT-23-5
MIC5233-3.0BM5
L330
3.0V
40
C to +125
C
SOT-23-5
MIC5233-3.3BM5
L333
3.3V
40
C to +125
C
SOT-23-5
MIC5233-5.0BM5
L350
5.0V
40
C to +125
C
SOT-23-5
MIC5233BM5
L3AA
ADJ.
40
C to +125
C
SOT-23-5
10
15
20
25
30
35
40
4
8 12 16 20 24 28 32 36 40
GROUND CURRENT (
A)
INPUT VOLTAGE (V)
I
OUT
= 10
A
I
OUT
= 1mA
I
OUT
= 100
A
Ground Current vs. Input Voltage
August 2003
3
MIC5233
MIC5233
Micrel
Electrical Characteristics
(Note 4)
T
A
= 25
C with V
IN
= V
OUT
+ 1V; I
OUT
= 100
A; V
EN
2V; 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 36V
0.04
0.5
%
Load Regulation
I
OUT
= 100
A to 100mA
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
Ground Current
I
OUT
= 100
A
18
30
A
35
A
I
OUT
= 50mA
0.35
0.70
mA
I
OUT
= 100mA
1
2
mA
Ground Current in Shutdown
V
EN
0.6V; V
IN
= 36V
0.1
1
A
Short Circuit Current
V
OUT
= 0V
190
350
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
= 36V; 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 36V
Enable Input Voltage ........................................... 0V to 36V
Junction Temperature (T
J
) ....................... 40
C to +125
C
Package Thermal Resistance
SOT-23-5
(
JA
) .................................................. 235
C/W
MIC5233
Micrel
MIC5233
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
OUT
= 100mA
0
50
100
150
200
250
300
350
0
20
40
60
80
100
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
= 100mA
0.0
0.5
1.0
1.5
2.0
2.5
3.0
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
= 50mA
I
LOAD
= 100mA
0
100
200
300
400
500
600
700
800
900
1000
0 10 20 30 40 50 60 70 80 90100
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
V
IN
= 36V
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
200
220
240
260
280
300
320
340
360
380
400
-40 -20
0
20 40 60 80 100 120
GROUND CURRENT (
A)
TEMPERATURE (
C)
Ground Pin Current
vs. Temperature
I
LOAD
= 50mA
0.80
0.85
0.90
0.95
1.00
1.05
1.10
1.15
1.20
-40 -20
0
20 40 60 80 100 120
GROUND CURRENT (mA)
TEMPERATURE (
C)
Ground Pin Current
vs. Temperature
I
LOAD
= 100mA
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
= 10
A
I
OUT
= 1mA
I
OUT
= 100
A
I
OUT
= 10
A
200
300
400
500
600
700
800
900
1000
1100
1200
1.5
2
2.5
3
3.5
4
GROUND CURRENT (
A)
INPUT VOLTAGE (V)
Ground Pin Current
vs. Input Voltage
I
OUT
=100mA
I
OUT
= 50mA
10
15
20
25
30
35
40
4
8 12 16 20 24 28 32 36 40
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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