US3018CW Datasheet

IC型號：
US3018CW
PDF描述：
5 BIT PROGRAMMABLE SYNCHRONOUS BUCK PLUS LDO CONTROLLER AND ...
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111.00KB
PDF頁數(shù)：
17頁
芯片廠家：
UNISEM

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US3018

5 BIT PROGRAMMABLE SYNCHRONOUS BUCK PLUS

LDO CONTROLLER AND 200mA LDO ON BOARD

FEATURES

Provides Single Chip Solution for Vcore, GTL+

& Clock Supply

200 mA On board LDO regulator

Designed to meet the latest Intel specification

for Pentium II鈩?/div>

On board DAC programs the output voltage

from 1.3V to 3.5V

Linear regulator controller on board for 1.5V

GTL+ supply

Loss less Short Circuit Protection with HICCUP

Synchronous operation allows maximum effi-

ciency

Patented architecture allows fixed frequency

operation as well as 100% duty cycle during

dynamic load

Soft Start

High current totem pole driver for direct driv-

ing of the external Power MOSFET

Power Good function Monitors all Outputs

OVP Circuitry Protects the Switcher Output and

generates a Fault signal

Thermal Shutdown

Logic Level Enable Input

DESCRIPTION

PRELIMINARY DATASHEET

APPLICATIONS

Total Power Soloution for Pentium II processor

application

The US3018 controller IC is specifically designed to meet

Intel specification for Pentium II鈩?microprocessor ap-

plications as well as the next generation of P6 family

processors.

The US3018 provides a single chip con-

troller IC for the Vcore , LDO controller for GTL+

and an internal 200mA regulator for clock supply

which are required for the Pentium II applications.

These devices feature a patented topology that in com-

bination with a few external components as shown in

the typical application circuit ,will provide in excess of

18A of output current for an on- board DC/DC converter

while automatically providing the right output voltage via

the 5 bit internal DAC. The US3018 also features,

loss

less current sensing for both switchers by using the

Rds-on of the high side Power MOSFET as the sens-

ing resistor, internal current limiting for the clock

supply,

a Power Good window comparator that switches

its open collector output low when any one of the out-

puts is outside of a pre programmed window. Other fea-

tures of the device are ; Undervoltage lockout for both

5V and 12V supplies, an external programmable soft

start function , programming the oscillator frequency via

an external resistor, OVP circuitry for both switcher out-

puts and an internal thermal shutdown.

TYPICAL APPLICATION

US3018

SWITCHER1

CONTROL

Vout1

3.3V

LINEAR

CONTROL

LINEAR

REGULATOR

3018app3-1.1

Vout2

Vout3

Notes: Pentium II is trade mark of Intel Corp.

PACKAGE ORDER INFORMATION

Ta (擄C)

0 TO 70

Rev. 1.4

12/8/00

Device

US3018CW

Package

24 pin Plastic SOIC WB

4-1

型號

版本

描述

廠商

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US3018CW Datasheet

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