US3021BCW Ver la hoja de datos (PDF) - Unisem

Número de pieza

componentes Descripción

Lista de partido

US3021BCW

5 BIT PROGRAMMABLE SYNCHRONOUS BUCK PLUS TRIPPLE LDO CONTROLLER

Unisem 

US3021B

BLOCK DIAGRAM

V12

V5

SD

Vsen1

PGood

Vsen3

Vsen4

Fix

Vaux

Drive4

Drive3

Select

Drive2

Vsen2

Enable

UVLO

R

1.26V

3R

1.17Vset

V12

Over

Voltage

Vset

Enable

1.1Vset

PWM

+

Control

V12

Slope

Comp

Osc

0.9Vset

Enable

Soft

Start &

Fault

Logic

Over

Current

200uA

Vset

1.5V

3.3V

R

3R

5Bit

DAC

Fb

UGate

LGate

Phase

OCSet

PGnd

Gnd

Fault / Rt

SS

VID0

VID1

VID2

VID3

VID4

3021Bblk1-1.4

Figure 1 - Simplified block diagram of the US3021.

4-6

Rev. 1.4

12/8/00

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