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MIC5249-1.5YMM

300mA µCap LDO with Programmable Power-On Reset Delay

Micrel 

MIC5249

300mA µCap LDO with

Programmable Power-On Reset Delay

General Description

The MIC5249 is an efficient, precise 300mA CMOS

voltage regulator with power on reset (POR) delay which

can be implemented via an external capacitor. It offers 1%

initial accuracy, extremely low dropout voltage (typically

400mV @ 300mA), and low ground current (typically

85mA) over load.

Designed specifically for noise-critical applications in hand-

held or battery-powered devices, the MIC5249 comes

equipped with a noise reduction feature to filter the output

noise via an external capacitor. Other features of the

MIC5249 include a logic-compatible enable pin, current

limit, thermal shutdown, ultra-fast transient response, and

an active clamp to speed up device turnoff.

The MIC5249 also works with low-ESR ceramic

capacitors, reducing the amount of board space necessary

for power applications, critical in hand-held wireless

devices.

The MIC5249 is available in the MSOP-8 package.

Data sheets and support documentation can be found on

Micrel’s web site at: www.micrel.com.

Features

• 300mA output current

• High PSRR: 65dB@120Hz

• Stable with ceramic output capacitor

• Power-on-Reset (POR) output with adjustable delay

time

• High output accuracy:

− ±1.0% initial accuracy

− ±3.0% over temperature

• Low dropout voltage of 340mV @ 300mA

• Low quiescent current: 85µA

• Zero current shutdown mode

• Thermal-shutdown and current-limit protection

• Tiny MSOP-8 package

Applications

• Cellular phones

• PDAs

• Fiber optic modules

Typical Application

Ultra-Low Noise Application

Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com

March 2012

1

M9999-030812

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