MIC2937 Datasheet, PDF (1/12 Pages) Micrel Semiconductor – 750mA Low-Dropout Voltage Regulator

MIC2937A/29371/29372
Micrel, Inc.
MIC2937A/29371/29372
750mA Low-Dropout Voltage Regulator
General Description
The MIC2937A family are “bulletproof” efficient voltage regu-
lators with very low dropout voltage (typically 40mV at light
loads and 300mV at 500mA), and very low quiescent current
(160µA typical). The quiescent current of the MIC2937A in-
creases only slightly in dropout, thus prolonging battery life.
Key MIC2937A features include protection against reversed
battery, fold-back current limiting, and automotive “load dump”
protection (60V positive transient).
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.
Features
• High output voltage accuracy
• Guaranteed 750mA output
• Low quiescent current
• 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 posi-
tive transients
• 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
• Battery Powered Equipment
• Cellular Telephones
• Laptop, Notebook, and Palmtop Computers
• PCMCIA V_CC and V_PP Regulation/Switching
• Bar Code Scanners
• Automotive Electronics
• SMPS Post-Regulator/ DC to DC Modules
• High Efficiency Linear Power Supplies
Pin Configuration
123
INPUT GROUND OUTPUT
TO-263 Package
(MIC2937A-xxBU/WU)
1 2345
TO-263-5 Package
(MIC29371/29372BU/WU)
Five Lead Package Pin Functions:
MIC29371 MIC29372
1) Error
Adjust
2) Input
Shutdown
3) Ground Ground
4) Output
Input
5) Shutdown Output
123
INPUT GROUND OUTPUT
1 2345
TO-220 Package
(MIC2937A-xxBT/WT)
TO-220-5 Package
(MIC29371/29372BT/WT)
The TAB is Ground on the TO-220 and TO-263 packages.
Micrel, Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 [phone] • fax + 1 [phone] • http://www.micrel.com
May 2006
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MIC2937A/29371/29372