MIC5236 Low Quiescent Current µCap LDO Regulator0 pages

July 2005 1 MIC5236
MIC5236 Micrel, Inc.
MIC5236
Low Quiescent Current ìCap LDO Regulator
General Description
The MIC5236 is a low quiescent current, ìCap low-dropout
regulator. With a maximum operating input voltage of 30V and
a quiescent current of 20ìA, it is ideal for supplying keep-alive
power in systems with high-voltage batteries.
Capable of 150mA output, the MIC5236 has a dropout voltage
of only 300mV. It can also survive an input transient of
–20V to +60V.
As a ìCap LDO, the MIC5236 is stable with either a ceramic
or a tantalum output capacitor. It only requires a 1.0ìF output
capacitor for stability.
The MIC5236 includes a logic compatible enable input and
an undervoltage error flag indicator. Other features of the
MIC5236 include thermal shutdown, current-limit, overvoltage
shutdown, load-dump protection, reverse leakage protections,
and reverse battery protection.
Available in the thermally enhanced SOIC-8 and MSOP-8, the
MIC5236 comes in fixed 2.5V, 3.0V, 3.3V, 5.0V, and adjustable
voltages. For other output voltages, contact Micrel.
Typical Application
IGND = 20ìA
VOUT
3.0V/100ìA
VIN
30V
IN
MIC5236
EN
OUT
GND
ERR
Regulator with Low IO and Low IQ
Features
• Ultra-low quiescent current (IQ = 20ìA @IO = 100ìA)
• Wide input range: 2.3V to 30V
• Low dropout:
230mV @50mA;
300mV @150mA
• Fixed 2.5V, 3.0V, 3.3V, 5.0V, and Adjustable outputs
• ±1.0% initial output accuracy
• Stable with ceramic or tantalum output capacitor
• Load dump protection: –20V to +60V input transient
survivability
• Logic compatible enable input
• Low output flag indicator
• Overcurrent protection
• Thermal shutdown
• Reverse-leakage protection
• Reverse-battery protection
• High-power SOIC-8 and MSOP-8
Applications
• Keep-alive supply in notebook and
portable personal computers
• Logic supply from high-voltage batteries
• Automotive electronics
• Battery-powered systems
Micrel, Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
COUT
VOUT
3.0V/150mA
VIN
5V
VERR
IN
MIC5236
EN
47k
OUT
GND
ERR
Regulator with Error Output
VOUT
3.0V/150mA
VIN
5V
IN
R1
R2
MIC5236
EN
OUT
GND
ADJ
Regulator with Adjustable Output