US3021BCW ETC-unknow, US3021BCW Datasheet

US3021BCW

Manufacturer Part Number

US3021BCW

Description

Manufacturer

ETC-unknow

Datasheet

1.US3021BCW.pdf (8 pages)

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FEATURES

TYPICAL APPLICATION

PACKAGE ORDER INFORMATION

FEATURES

TYPICAL APPLICATION

PACKAGE ORDER INFORMATION

Rev. 1.4

12/8/00

APPLICATIONS

Total Power Soloution for Next Generation Intel

Processor application

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 1.8V

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

Vout2

Vout3

3.3V

Ta ( C)

0 TO 70

5 BIT PROGRAMMABLE SYNCHRONOUS BUCK

US3021B

CONTROL

LINEAR

US3021BCW

Device

PLUS TRIPPLE LDO CONTROLLER

SWITCHER

CONTROL

LINEAR

DESCRIPTION

The US3021B controller IC is specifically designed to

meet Intel specification for next generation micropro-

cessor applications requiring multiple on board regula-

tors . The US3021B 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 US3021B typically uses Bipolar

transistors for Vout3(1.5V) and Vout4(1.8V) however

if Vaux pin is connected to 12V, then MOSFETs can

also be used as external pass elements. No exter-

nal resistor divider is necessary for any of the regu-

lators. The switching regulator feature a patented topol-

ogy that in combination with a few external components

as shown in the typical application circuit ,will provide

well in excess 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 US3021B

also features, 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 condi-

tion 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 out-

puts is outside of a pre programmed window.

28 pin Plastic SOIC WB

3021Bapp3-1.1

Package

PRELIMINARY DATASHEET

Vout1

Vout4

US3021B

4-1

Related parts for US3021BCW

US3021BCW Summary of contents

Page 1

... 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. LINEAR CONTROL SWITCHER CONTROL US3021B LINEAR LINEAR CONTROL CONTROL 3021Bapp3-1.1 Device US3021BCW 28 pin Plastic SOIC WB US3021B PRELIMINARY DATASHEET Vout1 Vout4 Package 4-1 ...

Page 2

US3021B ABSOLUTE MAXIMUM RATINGS ABSOLUTE MAXIMUM RATINGS V5 supply Voltage ........................................... 7V V12 Supply Voltage ............................................ 20V Storage Temperature Range ................................. -65 TO 150 C Operating Junction Temperature Range .......... 0 TO 125 C PACKAGE INFORMATION PACKAGE INFORMATION 28 PIN ...

Page 3

Error Comparator Section Input bias current Input Offset Voltage Delay to Output Current Limit Section C.S Threshold Set Current C.S Comp Offset Voltage Hiccup Duty Cycle Output Drivers Section Rise Time Fall Time Dead band Time Between High side and ...

Page 4

US3021B Note 1: Vs refers to the set point voltage given in Table ...

Page 5

Pin Description PIN# PIN SYMBOL This pin is internally connected to the undervoltage and overvoltage comparators sensing 22 Vsen1 the Vcore status. It must be connected directly to the Vcore supply. This pin provides the feedback for the AGP linear ...

Page 6

US3021B BLOCK DIAGRAM BLOCK DIAGRAM V12 Enable V5 UVLO SD Vsen1 PGood Vsen3 Vsen4 Fix Vaux Drive4 R 1.26V 3R Drive3 Select R 3R Drive2 Vsen2 Figure 1 - Simplified block diagram of the US3021. 4-6 1.17Vset Over Vset Enable ...

Page 7

TYPICAL APPLICATION TYPICAL APPLICATION (Dual Layout with HIP6021) 12V Type Detect R15 R5 3.3Vin C6 Q2 Vout2 1.5V / 3.3V C13 Q4 Vout3 1.5V C18 Q5 Vout4 1.8V C19 Figure 2 - Typical application of US3021B ...

Page 8

US3021B US3021M Application Parts List Dual Layout with HIP6021 Ref Desig Description Q1 MOSFET Q2 MOSFET Q3 MOSFET with Schottky Q4,5 Transistor L1 Inductor L2 Inductor C1 Capacitor, Electrolytic C2,3 Capacitor, Electrolytic C4 Capacitor, Ceramic C5 Capacitor, Ceramic C6,18 Capacitor, ...

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