MIC2937A/29371/29372
Micrel
MIC2937A/29371/29372
750mA Low-Dropout Voltage Regulator
General Description
Features
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High output voltage accuracy
Guaranteed 750mA output
Low quiescent current
The MIC2937A family are “bulletproof” efficient voltage
regulators with very low dropout voltage (typically 40mV at
light loads and 300mV at 500mA), and very low quiescent
current(160µAtypical).ThequiescentcurrentoftheMIC2937A
increases only slightly in dropout, thus prolonging battery life.
Key MIC2937A features include protection against reversed
battery,fold-backcurrentlimiting,andautomotive“loaddump”
protection (60V positive transient).
Low dropout voltage
Extremely tight load and line regulation
Very low temperature coefficient
Current and thermal limiting
Input can withstand –20V reverse battery and +60V
positive transients
The MIC2937 is available in several configurations. The
MIC2937A-xx devices are three pin fixed voltage regulators
with 3.3V, 5V, and 12V outputs available. The MIC29371 is a
fixed regulator offering logic compatible ON/OFF switching
input and an error flag output. This flag may also be used as
a power-on reset signal. A logic-compatible shutdown input is
provided on the adjustable MIC29372, which enables the
regulator to be switched on and off.
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Error flag warns of output dropout
Logic-controlled electronic shutdown
Output programmable from 1.24V to 26V(MIC29372)
Available in TO-220, TO-263, TO-220-5, and TO-263-5
packages.
Applications
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Battery Powered Equipment
Cellular Telephones
Laptop, Notebook, and Palmtop Computers
PCMCIA VCC and VPP Regulation/Switching
Bar Code Scanners
Automotive Electronics
SMPS Post-Regulator/ DC to DC Modules
High Efficiency Linear Power Supplies
Pin Configuration
1
2 3 4 5
INPUT GROUND OUTPUT
TO-263-5 Package
(MIC29371/29372BU)
TO-263 Package
(MIC2937A-xxBU)
Five Lead Package Pin Functions:
MIC29371 MIC29372
1) Error
2) Input
3) Ground
4) Output
5) Shutdown Output
Adjust
1
2
3
1
2 3 4 5
Shutdown
Ground
Input
Front View
INPUT GROUND OUTPUT
TO-220 Package
(MIC2937A-xxBT)
TO-220-5 Package
(MIC29371/29372BT)
The TAB is Ground on the TO-220 and TO-263 packages.
3-18
October 1999