MIC5319

500mA µCap Ultra-Low Dropout

High PSRR LDO Regulator

MLF and MicroLeadFrame are registered trademarks of Amkor Technology, Inc.

General Description

The MIC5319 is a high-performance, 500mA LDO

regulator, offering extremely high PSRR and very-low

noise while consuming low ground current.

Ideal for battery-operated applications, the MIC5319

features 1% accuracy, extremely low-dropout voltage

(200mV @ 500mA), and low ground current at light load

(typically 90µA). Equipped with a logic-compatible enable

pin, the MIC5319 can be put into a zero-off-mode current

state, drawing no current when disabled.

The MIC5319 is a µCap design operating with very-small

ceramic output capacitors for stability, thereby reducing

required board space and component cost.

The MIC5319 is available in fixed-output voltages and

adjustable output voltages in the super-compact 2mm x

2mm MLF

Data sheets and support documentation can be found on

Micrel’s web site at www.micrel.com.

Features

• Ultra-low dropout voltage 200mV @ 500mA

• Input voltage range: 2.5 to 5.5V

• Stable with ceramic output capacitor

• Low output noise: 40µVrms

• Low quiescent current of 90µA total

• High PSRR, up to 70dB @1kHz

• Fast turn-on-time: 40µs typical

• High-output accuracy:

− ±1.0% initial accuracy

− ±2.0% over temperature

• Thermal-shutdown protection

• Current-limit protection

• Logic-controlled Enable

• Thin SOT-23-5 package, 500mA peak

Applications

• Cellular phones

• PDAs

• Fiber optic modules

• Portable electronics

• Notebook PCs

• Audio Codec power supplies

Typical Application

May 2010

M9999-052510