Datasheet > US3021MCW

US3021MCW

更新时间： 2024-09-23 22:17:07

品牌	Logo	应用领域
UNISEM		控制器
页数	文件大小	规格书
8页	64K
描述
5 BIT PROGRAMMABLE SYNCHRONOUS BUCK PLUS TRIPPLE LDO CONTROLLER

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US3021MCW 数据手册

US3021M

5 BIT PROGRAMMABLE SYNCHRONOUS BUCK

PLUS TRIPPLE LDO CONTROLLER

PRELIMINARY DATASHEET

FEATURES

DESCRIPTION

Provides Single Chip Solution for Vcore,

GTL+ ,AGP Bus, and 1.8V

The US3021M controller IC is specifically designed to

meet Intel specification for next generation micropro-

cessor applications requiring multiple on board regula-

tors . The US3021M provides a single chip control-

ler IC for the Vcore , 3LDO controllers, one with the

automatic select pin that connects to the TYPE DE-

TECT pin of the AGP slot for the AGP Vddq supply,

one for GTL+ and the other for the 1.8V chip set

regulator as required for the next generation PC

applications. The US3021M uses N ch MOSFET as

pass transistor for Vout2(Vddq), Vout3(1.5V) and

Vout4(1.8V). No external resistor divider is neces-

sary for any of the regulators. The switching regulator

feature a patented topology that in combination with a

few external components as shown in the typical appli-

cation circuit ,will provide well in excess of 20A of out-

put current for an on- board DC/DC converter while auto-

matically providing the right output voltage via the 5 bit

internal DAC .The US3021M also features, loss less cur-

rent sensing for both switcher by using the Rds-on

of the high side Power MOSFET as the sensing re-

sistor, an output under voltage shutdown that de-

tects short circuit condition for the linear outputs

and latches the system off, and a Power Good win-

dow comparator that switches its open collector output

low when any one of the outputs is outside of a pre pro-

grammed window.

Automatic Voltage Selection for AGP slot

Vddq supply

Linear regulator controller on board for 1.8V

Designed to meet Intel Latest VRM specifica-

tion for next generation micrprocessors

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 for all

outputs

Synchronous operation allows maximum

efficiency

Patented architecture allows fixed frequency

operation as well as 100% duty cycle during

dynamic load

Minimum part count

Soft Start

High current totem pole driver for direct

driving of the external Power MOSFET

Power Good function Monitors all Outputs

OVP Circuitry Protects the Switcher Output

and generates a Fault output

APPLICATIONS

Total Power Soloution for Next Generation Intel

Processor application

TYPICAL APPLICATION

3.3V

LINEAR

CONTROL

SWITCHER

CONTROL

Vout1

Vout2

US3021M

LINEAR

CONTROL

Vout3

Vout4

3021Mapp3-1.1

PACKAGE ORDER INFORMATION

Ta (°C)

Device

US3021MCW

Package

28 pin Plastic SOIC WB

0 TO 70

Rev. 1.3

12/8/00

4-1

12 3 4 5 6 7 8

中文翻译

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