MIC29302A_14 Datasheet, PDF (1/18 Pages) Micrel Semiconductor – 3A Fast-Response LDO Regulator

MIC29302A
3A Fast-Response LDO Regulator
General Description
The MIC29302A is a high-current, low-cost, low-dropout
voltage regulator that uses Micrel's proprietary Super βeta
PNP^® process with a PNP pass element. The 3A LDO
regulator features 450mV (full load) dropout voltage and
very low ground current. Designed for high-current loads,
these devices also find applications in lower current, low-
dropout critical systems, where their dropout voltages and
ground current values are important attributes.
Along with a total accuracy of ±2% (over temperature, line,
and load regulation) the regulator features very fast
transient recovery from input voltage surges and output
load current changes.
The MIC29302A has an adjustable output that can be set
by two external resistors to a voltage between 1.24V and
15V. In addition, the device is fully protected against
overcurrent faults, reversed input polarity, reversed lead
insertion, and overtemperature operation. A TTL logic
enable (EN) pin is available in the MIC29302A to
shutdown the regulator. When not used, the device can be
set to continuous operation by connecting EN to the input
(IN). The MIC29302A is available in the standard and 5-pin
TO-263 and TO-252 packages with an operating junction
temperature range of −40°C to +125°C.
Datasheets and support documentation can be found on
Micrel’s website at: www.micrel.com.
Features
• High-current capability
− 3A over full temperature range
• Low-dropout voltage of 450mV at full load
• Low ground current
• Accurate 1% guaranteed tolerance
• Extremely fast transient response
• Zero-current shutdown mode
• Error flag signals output out-of-regulation
• Adjustable output voltage
• Packages: TO-263-5L and TO-252-5L
Applications
• Processor peripheral and I/O supplies
• High-efficiency “green” computer systems
• Automotive electronics
• High-efficiency linear lower supplies
• Battery-powered equipment
• PC add-in cards
• High-efficiency post-regulator for switching supply
_________________________________________________________________________________________________________________________
Typical Application
V_OUT
= 1.242 ×  ^R1 + 1
 ^R2 
Dropout Voltage
vs. Output Current
500
400 ^{VIN = 3.3V}
VADJ = 0V
300
TA = 25ºC
200
100
0
0.0
0.5
1.0
1.5
2.0
2.5
3.0
OUTPUT CURRENT (A)
Super ßeta PNP is a registered trademark of Micrel, Inc.
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel [phone] • fax + 1 [phone] • http://www.micrel.com
October 3, 2014
Revision 2.0