LT8471 View Datasheet(PDF) - Linear Technology

Part Name

Description

View to exact match

LT8471

Dual Multitopology DC/DC Converters with 2A Switches and Synchronization

Linear Technology 

LT8471

Block Diagram

R3A

R3B

2.15V

250k

2.15V

250k

SS1

SR22

S

Q

R

50mV

SR21

S

Q

R

+

–

VIN2

UVLO

CSS1

SS2

SOFT-

START

VC1

50mV +

–

CSS2

VIN1

SYNC

SOFT-

START

INTERNAL

SUPPLY

REG

SYNC

BLOCK

VC2

2.15V

VOLTAGE

REFS

UVLO

1.215V

0.789V

–0.788V

RT

RT

FB2

RPG2

PG2

GND

ADJUSTABLE

OSCILLATOR

OSC

OSC

+

0.789V –

PGOOD

DET.

0.73V

+

–

–0.788V

–0.727V

OSC

FREQUENCY

FOLDBACK

FB1

RPG1

PG1

+

0.789V –

PGOOD

DET.

0.73V

+

–

–0.788V

–0.727V

OSC

FREQUENCY

FOLDBACK

1.37V

OV/UV

+

1.215V –

+

0.5V –

OV/UV

LOGIC

SKYHOOK

DISABLE

0.5V

VIN1

DRIVER

PEAK

DETECT

SHOUT

DSH

C3

Q3

C2

Q3 SWITCH CONTROL

AND COMPENSATION

SHOUT-C2

VOLTAGE COMPARE

CURRENT LIMIT

CONTROLLER

VC2

–

A32

+

COMPARATOR

SR12

R

Q

S

A43

40mV 80mΩ

VIN2

DRIVER

C2

Q2

A42

RSENSE2

RAMP

E2

GENERATOR

VC1

–

A31

+

COMPARATOR

SR11

R

Q

S

VIN1

DRIVER

C1

Q1

A41

RSENSE1

RAMP

GENERATOR

E1

C3

L3

VCC

CVCC

VOUT2

C2

R2A

L2

R2B

D2

L1

D1

VOUT1

R1A

C1

R1B

8

For more information www.linear.com/8471

8471 BD

8471fc

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