MIC5239
Low Quiescent Current 500mA µCap
LDO Regulator
General Description
The MIC5239 is a low quiescent current, µCap low-dropout
regulator. With a maximum operating input voltage of 30V
and a quiescent current of 23µA, it is ideal for supplying
keep-alive power in systems with high voltage batteries.
Capable of 500mA output, the MIC5239 has a dropout
voltage of only 350mV. It can provide high output current
for applications such as USB.
As a µCap LDO, the MIC5239 is stable with either a
ceramic or a tantalum output capacitor. It only requires a
3.3µF output capacitor for stability.
The MIC5239 includes a logic compatible enable input and
an undervoltage error flag indicator. Other features of the
MIC5239 include thermal shutdown, current limit, overvolt-
age shutdown, reverse-leakage protection, and reverse-
battery protection.
Available in the thermally enhanced SOIC-8, MSOP-8 and
SOT-223, the MIC5239 comes in fixed 1.5V, 1.8V, 2.5V,
3.0V, 3.3V and 5.0V, and adjustable voltages. For other
output voltages, contact Micrel.
All support documentation can be found on Micrel’s web
site at: www.micrel.com.
Features
•
•
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•
•
•
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Ultra-low quiescent current (I
Q
= 23µA @I
O
= 100µA)
Continuous 500mA output current
Wide input range: 2.3V to 30V
Low dropout voltage: 350mV @500mA
±1.0% initial output accuracy
Stable with ceramic or tantalum output capacitor
Logic compatible enable input
Low output voltage error flag indicator
Overcurrent protection
Thermal shutdown
Reverse-leakage protection
Reverse-battery protection
High-power SOIC-8, MSOP-8 and SOT-223 packages
Applications
•
USB power supply
•
Keep-alive supply in notebook and portable personal
computers
•
Logic supply from high voltage batteries
•
Automotive electronics
•
Battery-powered systems
___________________________________________________________________________________________________________
40
35
I
OUT
= 1mA
I
OUT
= 100µA
Typical Application
V
IN
30V
MIC5239
IN
OUT
EN
FLG
GND
V
OUT
3.0V/100µA
I
GND
= 23µA
30
25
20
15
I
OUT
= 10µA
9
14
Regulator with Low I
O
and Low I
Q
10
4
19
24
29
Ground Current vs. Input Voltage
MLF and
MicroLeadFrame
is a registered trademark of Amkor Technologies
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (
408
) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
December 2007
M9999-121007
MICREL [ MICREL SEMICONDUCTOR ]
