MIC49500

5A Dual Supply, Low Voltage,

High Bandwidth LDO

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

November 2005

M9999-110805

(408) 955-1690

General Description

The MIC49500 is an ultra-high-bandwidth, low-

dropout, 5.0A voltage regulator ideal for powering

core voltages of low-voltage microprocessors. The

MIC49500 implements a dual supply configuration

allowing for very low output impedance and very fast

transient response.

The MIC49500 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 6V and the bias supply requires between

3V and 6V for proper operation. The MIC49500 can

regulate to an output voltage as low as 0.7V, making it

an ideal product for low-voltage to low-voltage

conversion.

The MIC49500 requires a minimum of output

capacitance for stability, working optimally with any

type of capacitor, including small ceramic capacitors.

Available in fixed output voltages from 0.9V to 1.8V

and adjustable output voltages down to 0.7V, the

MIC49500 comes in both 7-pin S-Pak and TO-263

packages. The MIC49500 is rated to the full operating

temperature range of -40°C to 125°C junction

temperature.

Features

• Input voltage range:

–

–

• Stable with 10µF ceramic output capacitor

• +1.0% initial output tolerance

temperature

• Adjustable output voltage down to 0.7V

• Ultra Fast Transient Response (Up to 10MHz

bandwidth)

• Excellent line and load regulation specifications

• Logic controlled shutdown option

• Thermal shutdown and current limit protection

• Thin 7-pin S-Pak package

• TO-263 7-pin package

range

Applications

• ASIC Core Voltage Regulator

• PLD/FPGA Core Power Supply

• Linear Point-of-Load Conversion

• High Speed Post-Regulator

Typical Application

IN

BIAS

OUT

ADJ

GND

MIC49500WR

V

C

Ceramic

V

V

C

Ceramic

C

Ceramic

R1

R2

Low Voltage,

Fast Transient Response Regulator

Load Transient

Time (10µs/div)

5A

0A