AIC1571 AIC [Analog Intergrations Corporation], AIC1571 Datasheet

AIC1571

Manufacturer Part Number

AIC1571

Description

5-bit DAC, Synchronous PWM Power Regulator with Dual Linear Controllers

Manufacturer

AIC [Analog Intergrations Corporation]

Datasheet

1.AIC1571.pdf (18 pages)

Available stocks

Company

Part Number

Manufacturer

Quantity

Price

Company:

Bonase Electronics (HK) Co., Limited

Part Number:

AIC1571CS

Manufacturer:

REVOXRIFA

Quantity:

25 543

Current page: 1 of 18
Download datasheet (458Kb)

Analog Integrations Corporation

DS-1571-00 Oct 9, 00

FEATURES

APPLICATIONS

Provides 3 Regulated Voltages for Microproces-

sor Core, Clock and GTL Power.

Simple Voltage-Mode PWM Control.

Dual N-Channel MOSFET Synchronous Driver.

Operates from +3.3V, +5V and +12V Inputs.

Fast Transient Response.

Full 0% to 100% Duty Ratios.

±1.0% Output Voltage for VCORE and ±2.0%

Output Voltage Reference for VCLK and VGTL.

TTL Compatible 5-bit Digital-to-Analog Core Out-

put Voltage Selection. Range from 1.3V to 3.5V.

Adjustable Current Limit without External Sense

Resistor.

Microprocessor Core Voltage Protection against

Shorted MOSFET.

Power Good Output Voltage Monitor.

Over-Voltage and Over-Current Fault Monitors.

200KHz Free-Running Oscillator Programmable

up to 350KHz.

Full Motherboard Power Regulation for Comput-

ers.

Power Integrations for 3 Output Power System.

0.1V Steps from 2.1V to 3.5V.

0.05V Steps from 1.3V to 2.05V.

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

TEL: 886-3-5772500

Regulator with Dual Linear Controllers

5-bit DAC, Synchronous PWM Power

FAX: 886-3-5772510

The AIC1571 combines a synchronous voltage

mode controller with two linear controllers as well

as the monitoring and protection functions in this

chip. The PWM controller regulates the microproc-

essor core voltage with a synchronous rectified

buck converter. One linear controller regulates

power for the GTL bus and the other linear con-

troller provides power for the clock driver circuit or

memory (1.8V)

An integrated 5 bit D/A converter that adjusts the

core PWM output voltage from 2.1V to 3.5V in 0.1V

increments and from 1.3V to 2.05V in 0.05V incre-

ments. The linear regulator uses an internal driver

device to provide 2.5V±2.5%. The linear controller

drives with an external N-channel MOSEFET to

provide 1.5V±2.5%.

This chip monitors all the output voltages. Power

Good signal is issued when the core voltage is

within ±10% of the DAC setting and the other levels

are above their under-voltage levels. Over-voltage

protection for the core output uses the lower N-

channel MOSFET to prevent output voltage above

115% of the DAC setting.

The PWM over-current function monitors the out-

put current by using the voltage drop across the

upper MOSFET’s R

current sensing resistor

DESCRIPTION

DS(on)

, eliminating the need for a

www.analog.com.tw

AIC1571

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