Datasheet > US3027CW

US3027CW

更新时间： 2024-01-03 11:20:52

品牌	Logo	应用领域
UNISEM		控制器
页数	文件大小	规格书
8页	68K
描述
5 BIT PROGRAMMABLE SYNCHRONOUS BUCK PLUS TRIPPLE LDO CONTROLLER

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中文翻译

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数据手册

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US3027CW 数据手册

US3027

5 BIT PROGRAMMABLE SYNCHRONOUS BUCK

PLUS TRIPPLE LDO CONTROLLER

PRELIMINARY DATASHEET

FEATURES

DESCRIPTION

Designed to meet VRM 9.0 specification for

next generation micrprocessors

The US3027 controller IC is specifically designed to meet

VRM 9.0 specification for next generation microproces-

sor applications requiring multiple on board regulators .

The US3027 provides a single chip controller IC for

the Vcore , 3LDO controllers, one with the auto-

matic select pin that connects to the TYPE DETECT

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

for GTL+ and the other for the 1.8V chip set regula-

tor as required for the next generation PC applica-

tions. The US3027 is designed to use either Bipolar

transistors for Vout3(1.5V) and Vout4(1.8V) or if Vaux

pin is connected to 12V, then MOSFETs can also be

used as external pass elements. No external resis-

tor divider is necessary 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 application circuit ,will provide well in ex-

cess of 20A of output current for an on- board DC/DC

converter while automatically providing the right output

voltage via the 5 bit internal DAC .The US3027 also fea-

tures, loss less current sensing for both switcher by

using the Rds-on of the high side Power MOSFET

as the sensing resistor, an output under voltage

shutdown that detects short circuit condition for the

linear outputs and latches the system off, and a

Power Good window comparator that switches its open

collector output low when any one of the outputs is out-

side of a pre programmed window.

On board 5 bit DAC programs the output

voltage from 1.075V to 1.850V in 25mV steps

Linear regulator controller on board for 1.8V

Provides Single Chip Solution for Vcore,

GTL+ ,AGP Bus, and 1.8V

Automatic Voltage Selection for AGP slot

Vddq supply

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

AMD K7 Low Cost Solution

TYPICAL APPLICATION

3.3V

LINEAR

CONTROL

SWITCHER

CONTROL

Vout1

Vout4

Vout2

US3027

LINEAR

CONTROL

LINEAR

CONTROL

Vout3

3027app3-1.0

PACKAGE ORDER INFORMATION

Ta (°C)

Device

US3027CW

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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与US3027CW相关器件

型号	品牌	获取价格	描述	数据表
US3027M	UNISEM	获取价格	5 Bit Programmable Synchronous Buck Controller with 3 LDO Controllers
US3033	UNISEM	获取价格	PWM SWITCHER & LINEAR CONTROLLER IC
US3033CS	UNISEM	获取价格	PWM SWITCHER & LINEAR CONTROLLER IC
US3034	UNISEM	获取价格	8 PIN PWM SWITCHER CONTROLLER IC
US3034CS	UNISEM	获取价格	8 PIN PWM SWITCHER CONTROLLER IC
US3036	UNISEM	获取价格	8 PIN PWM SWITCHER CONTROLLER IC
US3036CS	UNISEM	获取价格	8 PIN PWM SWITCHER CONTROLLER IC
US3075	UTC	获取价格	POWER DISTRIBUTION SWITCH
US3075 US3375	UTC	获取价格	Power Distribution Swi...
US3075_15	UTC	获取价格	POWER DISTRIBUTION SWITCH

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