RT8857 데이터 시트보기 (PDF) - Richtek Technology

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RT8857

4/3/2/1-Phase PWM Controller with Embedded Drivers for CPU Core Power Supply

Richtek Technology 

RT8857/A

Function Block Diagram

RT

COMP

FB

OFS

Modulator

Waveform

Generator

-

+EA

Offset

+

OV

-

+

150mV

VOUT

QR1/QR2

Transient

Response

Enhancement

SS/EN

EN/VTT

OV

OC

VIDOFF

POR

+

-

+

850mV

Soft Start

and

Fault

Logic

VIDSEL

VID7 to VID0

FBRTN

ADJ

IMAX/

IMAXPSI

IMONFB

GND

VID

Table

Generator

-

+

OC

-

Load Current

Monitor

IMON

POR

Power-On

Reset

5V

Regulator

MOSFET

+

Driver

-

+

MOSFET

-

OE

Driver

+

-

OE

+

-

OE

I_SEN1 CH1

-

Current

SENSE

I_SEN2 CH2

-

Current

SENSE

AVG

CH3

-

I_SEN3 Current

SENSE

-

Temperature

Monitor

I_SEN4 CH4

Current

SENSE

TSEN

VCC12

VCC5

BOOT1

UGATE1

PHASE1

LGATE1

BOOT2

UGATE2

PHASE2

LGATE2

PWM3

PWM4

PSI

ISP1

ISN1

ISP2

ISN2

ISP3

ISN3

ISP4

ISN4

VRHOT

www.richtek.com

14

DS8857/A-01 April 2011

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