MIC5239 Datasheet, PDF (1/12 Pages) Micrel Semiconductor – Low Quiescent Current 500mA UCap LDO Regulator

MIC5239
Micrel
MIC5239
Low Quiescent Current 500mA µCap LDO Regulator
Advance Information
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, load-dump protection, reverse leakage pro-
tections, and reverse battery protection.
Available in the thermally enhanced SOIC-8, MSOP-8 and
SOT-223, the MIC5239 comes in fixed 3.0V and adjustable
voltages. For other output voltages, contact Micrel.
Features
• Ultra-low quiescent current (I_Q = 23µA @I_O = 100µA)
• Continuious 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
Typical Application
MIC5239
V_IN
IN OUT
30V
EN FLG
GND
V_OUT
3.0V/100µA
I_GND = 23µA
Regulator with Low I_O and Low I_Q
40
35
I_OUT = 1mA
30
25
I_OUT = 100µA
20
15 ^IOUT ^{= 10µA}
104 _{9 14 19 24 29}
INPUT VOLTAGE (V)
Ground Current vs. Input Voltage
Micrel, Inc. • 1849 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 [phone] • fax + 1 [phone] • http://www.micrel.com
January 2002
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MIC5239