MIC2920 Datasheet, PDF (1/12 Pages) Micrel Semiconductor – 400mA Low-Dropout Voltage Regulator

MIC2920A/29201/29202/29204
Micrel, Inc.
MIC2920A/29201/29202/29204
400mA Low-Dropout Voltage Regulator
General Description
The MIC2920A family are “bulletproof,” efficient voltage regu-
lators with very low dropout voltage (typically 40mV at light
loads and 370mV at 250mA), and very low quiescent current
(140µA typical). The quiescent current of the MIC2920A in-
creases only slightly in dropout, prolonging battery life. Key
MIC2920A features include protection against reversed bat-
tery, fold-back current limiting, and automotive “load dump”
protection (60V positive transient).
The MIC2920 is available in several configurations. The
MIC2920A-x.x devices are three pin fixed voltage regulators
available in 3.3V, 4.85V, 5V, and 12V outputs. The MIC29201
is a fixed regulator offering a logic compatible ON/OFF (shut-
down) 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 MIC29202 which allows
the regulator to be switched on and off. The MIC29204 8-pin
SOIC adjustable regulator includes both shutdown and error
flag pins and may be pin-strapped for 5V output or programmed
from 1.24V to 26V using two external resistors.
Features
• High output voltage accuracy
• Guaranteed 400mA output
• Low quiescent current
• Low dropout voltage
• Extremely tight load and line regulation
• Very low temperature coefficient
• Current and thermal limiting
• Input withstands –20V reverse battery and
60V positive transients
• Error flag warns of output dropout
• Logic-controlled electronic shutdown
• Output programmable from 1.24V to 26V
(MIC29202/MIC29204)
• Available in TO-220-3, TO-220-5, and surface-mount
TO-263-5, SOT-223, and SO-8 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-regulators
• Voltage reference
• High-efficiency linear power supplies
Pin Configuration
TAB
OUTPUT 1
8 INPUT
TAB
TAB
SENSE 2
7 NC
SHUTDOWN 3
6 NC
GROUND 4
5 ERROR
1
2
3
MIC29201-3.3BM (SOIC-8)
OUTPUT 1
8 INPUT
SENSE 2
7 ADJUST
SHUTDOWN 3
6 5V TAP
INPUT
OUTPUT
GROUND
MIC2920A-x.xBS
(SOT-223)
TAB
GROUND 4
5 ERROR
MIC29204BM (SOIC-8)
5-Lead Package Pinouts
MIC29201 MIC29202
1) Error
Adjust
2) Input
Shutdown
3) Ground
Ground
4) Output
Input
5) Shutdown Output
12345
MIC29201/29202BU
(TO-263-5)
12 3
IN OU T
GND
MIC2920A-xxBT
(TO-220)
1 2 34 5
MIC29201/29202BT
(TO-220-5)
Tab is Ground on SOT-223, 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
February 2005
1
M9999-021505