MIC5235
Micrel
MIC5235
Ultra-Low Quiescent Current, 150 mA
µ
Cap LDO Regulator
Final Information
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
µCap
LDO design, the MIC5235 is stable with either
ceramic or tantalum output capacitor. It only requires a 2.2µF
capacitor for stability.
Features of the MIC5235 includes enable input, thermal
shutdown, current limit, reverse battery protection, and
reverse leakage protection.
Available in 3.0V and adjustable output voltage verisons, the
MIC5235 is offered in the IttyBitty™ SOT-23-5 package with
a junction temperature range of –40°C to +125°C.
Features
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Wide input voltage range: 2.3V to 24V
Ultra low ground current: 18µA
Low dropout voltage of 310mV at 150mA
High output accuracy of
±2.0%
over temperature
µCap:
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
IttyBitty SOT-23-5 package
USB power supply
Cellular phones
Keep-alive supply in notebook and portable computers
Logic supply for high-voltage batteries
Automotive electronics
Battery powered systems
Applications
Ordering Information
Part Number
MIC5235-3.0BM5
MIC5235BM5
Marking
L230
L2AA
Voltage
3.0V
ADJ.
Junction Temp. Range*
–40°C to +125°C
–40°C to +125°C
Package
SOT-23-5
SOT-23-5
Typical Application
40
GROUND CURRENT (µA)
35
30
25
20
15
10
4
I
OUT
= 10µA
9
14
19
INPUT VOLTAGE (V)
24
I
OUT
= 1mA
V
IN
C
IN
=1.0µF
OFF ON
MIC5235BM5
1
2
3
4
5
V
OUT
=1.8V
R
1
R
2
C
OUT
=2.2µF
ceramic
I
GND
=18µA
I
OUT
= 100µA
EN
Ultra-Low Current Adjustable Regulator Application
Ground Current vs. Input Voltage
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
January 2002
1
MIC5235
MIC5235
Micrel
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
(θ
JA
) .................................................. 235°C/W
Electrical Characteristics
T
A
= 25°C with V
IN
= V
OUT
+ 1V; I
OUT
= 100µA ,
Bold
values indicate –40°C < T
J
< +125°C; unless otherwise specified.
Parameter
Output Voltage Accuracy
Line Regulation
Load Regulation
Dropout Voltage
Condition
Variation from nominal V
OUT
V
IN
= V
OUT
+ 1V to 24V
Load = 100µA to 150mA
I
OUT
= 100µA
I
OUT
= 50mA
I
OUT
= 100mA
I
OUT
= 150mA
Ground Current
I
OUT
= 100µA
I
OUT
= 50mA
I
OUT
= 100mA
I
OUT
= 150mA
Ground Current in Shutdown
Short Circuit Current
Output Leakage,
Reverse Polarity Input
Enable Input
Input Low Voltage
Input High Voltage
Enable Input Current
Regulator OFF
Regulator ON
V
EN
= 0.6V; Regulator OFF
V
EN
= 2.0V; Regulator ON
V
EN
= 24V; Regulator ON
2.0
–1.0
0.01
0.1
0.5
1.0
1.0
2.5
0.6
V
V
µA
µA
µA
V
EN
≤
0.6V; V
IN
= 24V
V
OUT
= 0V
Load = 500Ω; V
IN
= –15V
Min
–1.0
–2.0
0.04
0.25
50
230
270
310
18
0.35
1
2
0.1
350
–0.1
1
300
400
400
450
450
500
30
35
0.7
2
4
1
500
Typ
Max
+1.0
+2.0
Units
%
%
%
%
mV
mV
mV
mV
mV
mV
mV
µA
µA
mA
mA
mA
µA
mA
µA
Note 1.
Note 2.
Note 3.
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.
January 2002
3
MIC5235
MIC5235
Micrel
Typical Characteristics (MIC5235-3.0BM5)
Power Supply
Rejection Ratio
70
60
50
DROPOUT VOLTAGE (mV)
300
250
200
150
100
50
0
0
20 40 60 80 100 120 140 160
OUTPUT CURRENT (mA)
DROPOUT VOLTAGE (mV)
I
LOAD
= 150mA
350
Dropout Voltage
vs. Output Current
500
Dropout Voltage
vs. Temperature
450 I
OUT
= 150mA
400
350
300
250
200
150
100
50
0
-40 -20 0 20 40 60 80 100 120
TEMPERATURE (°C)
PSRR (dB)
40
30
20
10
0
0.01
0.1
1
10
100
FREQUENCY (Hz)
1000
Dropout
Characteristics
3.5
GROUND CURRENT (µA)
Ground Pin Current
vs. Output Current
3000
2500
2000
1500
1000
500
0
0
20 40 60 80 100 120 140 160
OUTPUT CURRENT (mA)
V
IN
= 4V
GROUND CURRENT (µA)
Ground Pin Current
vs. Output Current
30
28
26
24
22
20
18
16
14
12
10
0
100 200 300 400 500
OUTPUT CURRENT (µA)
V
IN
= 24V
OUTPUT VOLTAGE (V)
3
I
LOAD
= 100µA
2.5 I
LOAD
= 75mA
2
1.5
1
0.5
0
0 0.5 1 1.5 2 2.5 3 3.5 4
INPUT VOLTAGE (V)
I
LOAD
= 150mA
V
IN
= 12V
V
IN
= 4V
80
Ground Pin Current
vs. Temperature
GROUND CURRENT (µA)
GROUND CURRENT (µA)
75
70
65
60
55
50
45
40
-40 -20 0
GROUND CURRENT (mA)
I
LOAD
= 10mA
700
680
660
640
620
600
580
560
540
520
500
Ground Pin Current
vs. Temperature
I
LOAD
= 75mA
2.5
2.4
2.3
2.2
2.1
2
1.9
1.8
1.7
1.6
Ground Pin Current
vs. Temperature
I
LOAD
= 150mA
20 40 60 80 100 120
-40 -20 0
20 40 60 80 100 120
TEMPERATURE (°C)
TEMPERATURE (°C)
1.5
-40 -20 0 20 40 60 80 100 120
TEMPERATURE (°C)
Ground Pin Current
vs. Input Voltage
GROUND CURRENT (µA)
100
90
80
70
60
50 I
OUT
= 1mA
40
30
20
10
0
1.5
I
OUT
= 10mA
Ground Pin Current
vs. Input Voltage
GROUND CURRENT (µA)
GROUND CURRENT (µA)
2.4
2.2
2
1.8
1.6
1.4
1.2
1
0.8
0.6
0.4
1.5
40
I
OUT
=150mA
35
30
25
20
15
10
4
Ground Pin Current
vs. Input Voltage
I
OUT
= 1mA
I
OUT
= 100µA
I
OUT
= 100µA
I
OUT
= 75mA
I
OUT
= 10µA
2
2.5
3
3.5
INPUT VOLTAGE (V)
4
I
OUT
= 10µA
9
14
19
INPUT VOLTAGE (V)
24
2
2.5
3
3.5
INPUT VOLTAGE (V)
4
MIC5235
4
January 2002
微控制器 MCU
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