MIC29302A
3A Fast-Response LDO Regulator
General Description
The MIC29302A is a high-current, low-cost, low-dropout
voltage regulator which 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 voltage
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 which can be
set by two external resistors to a voltage between 1.24V to
15V. In addition, the device is fully protected against over
current 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.
Data sheets and support documentation can be found on
Micrel’s web site at:
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 lost-regulator for switching supply
_________________________________________________________________________________________________________________________
Typical Application
500
Dropout Voltage
vs. Output Current
V
IN
= 3.3V
V
ADJ
= 0V
T
A
= 25ºC
DROPOUT VOLTAGE (mV)
400
300
200
V
OUT
⎛
R1
⎞
=
1.242
× ⎜
+
1
⎟
⎝
R2
⎠
100
0
0.0
0.5
1.0
1.5
2.0
2.5
3.0
OUTPUT CURRENT (A)
MIC29302A Adjustable Output Regulator
Super ßeta PNP is a registered trademark of Micrel, Inc.
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 •
http://www.micrel.com
August 2011
M9999-080411-A
MICREL [ MICREL SEMICONDUCTOR ]
