MIC5233
High Input Voltage
Low IQ
µCap
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
μCap
LDO design, the MIC5233 is stable with either
ceramic or tantalum output capacitor. It only requires a
2.2μF capacitor for stability.
Features of the MIC5233 include enable input, thermal
shutdown, current limit, reverse battery protection, and
reverse leakage protection.
Available in fixed and adjustable output voltage versions,
the MIC5233 is offered in the IttyBitty® SOT-23-5 package
with a junction temperature range of –40°C to +125°C.
Data sheets and support documentation can be found on
Micrel’s web site at www.micrel.com.
Features
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Wide input voltage range: 2.3V to 36V
Ultra low ground current: 18μA
Low dropout voltage of 270mV at 100mA
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
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
V
IN
C
IN
=1.0µF
OFF
ON
MIC5233BM5
1
2
3
4
5
V
OUT
R
1
R
2
C
OUT
=2.2µF
ceramic
I
GND
=18µA
EN
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
September 2009
M9999-092109
Micrel, Inc.
MIC5233
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, Note 3
Operating Ratings
(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
(θ
JA
)
...........................................................................
235°C/W
Electrical Characteristics
(4)
T
A
= 25°C with V
IN
= V
OUT
+ 1V; I
OUT
= 100µA; V
EN
≥
2V;
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 36V
I
OUT
= 100µA to 100mA
I
OUT
= 100µA
I
OUT
= 50mA
I
OUT
= 100mA
Ground Current
I
OUT
= 100µA
I
OUT
= 50mA
I
OUT
= 100mA
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
VEN = 0.6V; Regulator OFF
VEN = 2.0V; Regulator ON
VEN = 36V; Regulator ON
Start-Up Time
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, 1.5kΩ in series with 100pF.
4. Specification for packaged product only.
Min
–1.0
–2.0
Typ
Max
+1.0
+2.0
Units
%
%
%
%
mV
mV
mV
mV
mV
µA
µA
mA
mA
µA
mA
µA
0.04
0.25
50
230
270
18
0.25
1
0.1
190
–0.1
0.5
1
300
400
400
450
30
35
0.70
2
1
350
V
EN
≤
0.6V; V
IN
= 36V
V
OUT
= 0V
Load = 500Ω; V
IN
= –15V
0.6
2.0
–1.0
0.01
0.1
0.5
1.7
1.0
1.0
2.5
7
V
V
µA
µA
µA
msec
Guaranteed by design
September 2009
3
M9999-092109
嵌入式系统
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