MIC5235
Ultra-Low Quiescent Current, 150mA
µCap
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 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 fixed and adjustable output voltage versions,
®
the MIC5235 is offered in the IttyBitty SOT-23-5 package
with a junction temperature range of –40°C to +125°C.
Features
•
•
•
•
•
•
•
•
•
•
•
•
Wide input voltage range: 2.3V to 24V
Ultra low ground current: 18µA
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 battery protection
Reverse leakage protection
Thermal shutdown and current limit protection
IttyBitty
®
SOT-23-5 package
Adjustable output from 1.24V-20V
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
40
GROUND CURRENT (µA)
V
IN
C
IN
=1.0µF
EN
MIC5235BM5
1
2
3
4
5
V
OUT
=1.8V
R
1
R
2
C
OUT
=2.2µF
ceramic
I
GND
=18µA
35
30
25
20
15
10
49
I
OUT
= 10µA
14
19
INPUT VOLTAGE (V)
24
I
OUT
= 1mA
I
OUT
= 100µA
Ultra-Low Current Adjustable Regulator Application
Ground Current vs. Input Voltage
IttyBitty is a registered 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
May 2008
M9999-051508
Micrel, Inc.
MIC5235
Absolute Maximum Ratings
(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
(3)
Operating Ratings
(2)
Input Supply Voltage ......................................... 2.3V to 24V
Enable Input Voltage............................................ 0V to 24V
Junction Thermal....................................... –40°C to +125°C
Package Thermal Resistance
SOT-23-5 (θ
JA
).................................................235°C/W
Electrical Characteristics
(4)
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
Condition
Min
Typ
Max
Units
Output Voltage Accuracy
Line Regulation
Load Regulation
Dropout Voltage
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
–1.0
–2.0
0.04
0.25
50
230
270
310
1.22
1.24
18
0.35
1
2
0.1
350
–0.1
+1.0
+2.0
1
300
400
400
450
450
500
1.25
30
35
0.7
2
4
1
500
%
%
%
%
mV
mV
mV
mV
mV
mV
mV
V
µA
µA
mA
mA
mA
µA
mA
µA
Reference Voltage
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
V
EN
≤
0.6V; V
IN
= 24V
V
OUT
= 0V
Load = 500Ω; V
IN
= –15V
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
0.6
V
V
µA
µA
µA
–1.0
0.01
0.1
0.5
1.0
1.0
2.5
Notes:
1. Exceeding the absolute maximum rating may damage the device.
2. The device is not guaranteed to function outside its operating rating.
3. Devices are ESD sensitive. Handling precautions recommended. Human body model, 1.5k in series with 100pF.
4. Specification for packaged product only.
May 2008
3
M9999-051508
嵌入式系统
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