LTC1876 Ver la hoja de datos (PDF) - Linear Technology

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LTC1876

High Efficiency, 2-Phase, Dual Synchronous Step-Down Switching Controller and Step-Up Regulator

Linear Technology 

LTC1876

W

FUNCTIONAL DIAGRA

FREQSET

PGOOD

VSEC

0.18µA

R6

FCB

R5

3.3VOUT

1.19V

1M

OSCILLATOR

WINDOW

COMPARATOR

4.5V –

+

DUPLICATE FOR SECOND

CONTROLLER CHANNEL

BOOST

CLK1

CLK2

VOSENSE1

VOSENSE2

BINH

DROP

OUT

DET

SQ

RQ

BOT FCB

TOP ON

TG

TOP

SW

RUN/SS1

SWITCH

LOGIC

INTVCC

BG

BOT

0.55V

+B

–

SHDN

PGND

+

FCB

–

0.8V

VREF

I1

I2

–

– ++ –

+

0.86V

3mV

4(VFB)

INTVCC

30k SENSE+

30k SENSE–

VIN

VIN

EXTVCC

INTVCC

+5V

SGND

4.8V +

–

STBYMD

5V

LDO

REG

INTERNAL

SUPPLY

SLOPE

COMP

1.2µA

6V

45k

SHDN

RST

4(VFB)

45k

2.4V

EA

OV

VFB

0.80V

0.86V

RUN

SOFT

START

VOSENSE

ITH

RUN/SS

INTVCC

VIN

DB

CB

+

D1

RSENSE

DSEC

R2

R1

CC

CC2

RC

CIN

COUT

CSEC

CSS

BOOST

REGULATOR

AUXSD

AUXVIN

L3

1.26V

VREF

AUXVFB

EAAUX

+

–

R7

R8

A1AUX

–

CC +

RC

Σ

RAMP

GENERATOR

RQ

SQ

1.2MHz

OSCILLATOR

OSCAUX

D5

AUXSW

AUXPGND

AUXVOUT

+

COUTAUX

1876 FD/F02

VOUT

Figure 2

1876fa

10

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