MIC49150

1.5A Low Voltage LDO Regulator

w/Dual Input Voltages

Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (

November 2006

1

M9999-111306

General Description

The MIC49150 is a high-bandwidth, low-dropout, 1.5A volt-

age regulator ideal for powering core voltages of low-

power microprocessors. The MIC49150 implements a dual

supply configuration allowing for very low output

impedance and very fast transient response.

The MIC49150 requires a bias input supply and a main

input supply, allowing for ultra-low input voltages on the

main supply rail. The input supply operates from 1.4V to

6.5V and the bias supply requires between 3V and 6.5V

for proper operation. The MIC49150 offers fixed output

voltages from 0.9V to 1.8V and adjustable output voltages

down to 0.9V.

The MIC49150 requires a minimum of output capacitance

for stability, working optimally with small ceramic

capacitors.

The MIC49150 is available in an 8-pin power MSOP pack-

age and a 5-pin S-Pak. Its operating temperature range is

–40°C to +125°C.

Data sheets and support documentation can be found on

Micrel’s web site at www.micrel.com.

Features

• Input Voltage Range:

–

–

• Stable with 1µF ceramic capacitor

• ±1% initial tolerance

over temperature

• Adjustable output voltage down to 0.9V

• Ultra fast transient response (Up to 10MHz bandwidth)

• Excellent line and load regulation specifications

• Logic controlled shutdown option

• Thermal shutdown and current limit protection

• Power MSOP-8 and S-Pak packages

• Junction temperature range: –40°C to 125°C

Applications

• Graphics processors

• PC add-in cards

• Microprocessor core voltage supply

• Low voltage digital ICs

• High efficiency linear power supplies

• SMPS post regulators

Typical Application

MIC49150BR

GND

Ceramic

BIAS

IN

OUT

Ceramic

ADJ

Ceramic

R1

R2

Low Voltage,

Fast Transient Response Regulator