LT8551 datasheet(32/32 Pages) AD

32 / 32 page

LT8551

Rev 0



ANALOG DEVICES, INC. 2019

06/19

www.analog.com

RELATED PARTS

TYPICAL APPLICATION

PART NUMBER

DESCRIPTION

COMMENTS

LTC3786

38V Low IQ Synchronous Boost Controller 4.5V (Down to 2.5V After Start-Up) ≤ VIN ≤ 38V, VOUT Up to 60V, 50kHz to 900kHz Fixed

Operating Frequency, 3mm×3mm QFN-32, MSOP-16E

LTC3769

60V Low IQ Synchronous Boost Controller 4.5V (Down to 2.3V After Start-up) ≤ VIN≤ 60V, VOUT up to 60V, 50kHz to 900kHz Fixed

Operating Frequency, 4mm×4mm QFN-24, TSSOP-20

LT8550

4-Phase Buck DC/DC Expander

VIN up to 80V, 18 Distinct Phases, 125KHz to 1MHz, Supports Bidirectional Current Flow,

7mm×8mm QFN-52

48V/12.5A Step-Up Expander System

VIN

REG

VIN

INTVCC

POWER STAGE 1

REG

GND

MODE

8551 TA05

ISP

ISN

1nF

COUT8,

COUT9

68µF

63V

COUT2

4.7µF

CIN7

150µF

100V

CIN2

4.7µF

464k 7.87k

1nF

100pF

10µF

0.22µF

1nF

SENSE–

SENSE+

EXTVCC

BOOST

CIN1

4.7µF

×3

+ C

IN6

150µF

100V

0.22µF

1nF

10nF

COUT6,

COUT7

68µF

63V

COUT1

4.7µF

×5

POWER STAGE 2

POWER STAGE 3

POWER STAGE 4

ENOUT

CLK1

TGSR TGSH

BGSH

TGSL

VIN

SHDN

REGIS

REGDRV

REG

PHS1

PHS2

VCC

PHS3

SYNC

ILIM

RT/MS

IAMPP

IAMPN

CLK2

TGBUF

BGBUF

ITH

ILIM

RUN

PLLIN/MODE

VFB

PGOOD

47k

10nF

47k

30.1k

1nF

47pF

4.7µF

10µH

RS2

10µH

RS1

15k

15nF

100pF

10nF

VBIAS

FREQ

GND

1µF

100V

1µF

100V

39k

LT8551

LTC3769

PINS FOR

POWER

STAGES 2,3,4

13k

160k

2.2µF

1nF

LT8551 PINS NOT SHOWN

IN THIS CIRCUIT:

BST2, BST3, BST4

TG2, TG3, TG4,

SW2, SW3, SW4,

BG2, BG3, BG4,

ISP2, ISP3, ISP4,

ISN2, ISN3, ISN4

VIN

5V TO

55V

VIN

VOUT

48V/12.5A

VOUT FOLLOWS VIN

WHEN VIN > 48V

REGSNS

INTVCC

OVMODE

12.1k

BST1

SW1

ISN1

ISP1

BG1

TG1

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