MIC29302A

3A Fast-Response LDO Regulator

Super ßeta PNP is a registered trademark of Micrel, Inc.

General Description

The MIC29302A is a high-current, low-cost, low-dropout

voltage regulator which uses Micrel's proprietary Super

βeta PNP

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: 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 lost-regulator for switching supply

_________________________________________________________________________________________________________________________

Typical Application

⎟

⎠

⎞

⎜

⎝

⎛

+

×

=

1

R2

R1

1.242

Dropout Voltage

vs. Output Current

0

100

200

300

400

500

0.0

0.5

1.0

1.5

2.0

2.5

3.0

OUTPUT CURRENT (A)

MIC29302A Adjustable Output Regulator

August 2011

M9999-080411-A