AIC1580/L

Simple PWM Power Regulator with Shutdown

Analog Integrations Corporation

4F, 9, Industry E. 9th Rd, Science Based Industrial Park, Hsinchu Taiwan, ROC

www.analog.com.tw

DS-1580-00

Sep 5, 00

TEL: 886-3-5772500

FAX: 886-3-5772510

1

FEATURES

Operation Voltage up to 15V.

Simple Voltage-Mode PWM Control.

Fast Transient Response.

2V and 1.3V

± 2% Feedback Voltage Reference

Option.

Adjustable Current Limit without External Sense

Resistors.

200KHz Free-Running Oscillator.

Short-Circuit Protection with Low Short Circuit

Output Current.

Low Shutdown Current

Built-in Soft Start.

APPLICATIONS

High-Power 5V to 3.xV DC/DC Regulators.

Low-Voltage Distributed Power Supplies.

DESCRIPTION

The AIC1580 is a high-power, high-efficiency

voltage-mode switching regulator controller for

motherboard V

I/O

power supply applications.

Designed to drive a N-channel MOSFET in a

standard buck topology, the AIC1580 features a

high voltage CMOS output driver, short-circuit

protection, and 8-pin package.

An external 4-bit Digital-to-Analog Converter

(DAC) can be used along with the AIC1580 to

adjust the output voltage from 2.0V to 3.5V in

0.1V increments. Table 1 on the following page

specifies the corresponding output voltage for

16 combinations of DAC inputs as in the typical

application circuit.

The 200KHz switching frequency allows for

using

small

external

components

while

maintaining high conversion efficiency. The

11MHz bandwidth and 6V/

µS slew rate of the

error

amplifier

ensures

high

converter

bandwidth and fast transient response.

The AIC1580 provides adjustable overcurrent

and short-circuit protections by sensing the

output current across the on resistance of the

external N-channel MOSFET rather than an

external low value sense resistor.

The AIC1580L provides lower reference voltage

(1.30V) than the default (2.00V, AIC1580) for

lower V