LTC1709EG-85 查看數據表（PDF） - Linear Technology

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产品描述 (功能)

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LTC1709EG-85

2-Phase, 5-Bit VID, Current Mode, High Efficiency, Synchronous Step-Down Switching Regulator

Linear Technology 

W

FU CTIO AL DIAGRA

LTC1709-85

PLLIN

fIN

50k

RLP PLLFLTR

CLP

PHASE DET

OSCILLATOR

CLK1

CLK2

TO SECOND

CHANNEL

PGOOD

VOS–

VOS+

0.86V

EAIN

0.74V

A1

–

+

DIFFOUT

3V

0.18µA

FCB

4.5V –

+

+

FCB

–

VIN

VIN

EXTVCC

INTVCC

5V

+

SGND

0.80V

4.8V +

–

VREF

5V

LDO

REG

INTERNAL

SUPPLY

ATTENIN 10k

ATTENOUT

R1

DUPLICATE FOR SECOND

CONTROLLER CHANNEL

INTVCC

VIN

BOOST

DB

DROP

OUT

DET

SQ

RQ

0.55V + B

–

BOT FCB

TOP ON

TG

TOP

SW

SWITCH

LOGIC

INTVCC

BG

BOT

PGND

SHDN

CB

+

D1

CIN

COUT

RSENSE

I1

–+

0.86V

4(VFB)

SLOPE

COMP

45k

– I2

+

45k

2.4V

INTVCC

30k SENSE+

30k SENSE–

1.2µA

6V

SHDN

RST

4(VFB)

EA

OV

VFB

0.80V

0.86V

RUN

SOFT

START

5-BIT VID DECODER

TYPICAL ALL

VID PINS

40k

EAIN

ITH

RUN/SS

CC

CC2 RC

CSS

VOUT

VID25mV VID0 VID1 VID2 VID3

VBIAS

170985 FBD

170985f

9

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