LT8705 datasheet(24/24 Pages) LINER

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LT3840

3840fa

For more information www.linear.com/LT3840



LINEAR TECHNOLOGY CORPORATION 2014

LT 0814 REV A • PRINTED IN USA

LinearTechnology Corporation

1630 McCarthy Blvd., Milpitas, CA 95035-7417

(408)432-1900 ● FAX: (408) 434-0507 ● www.linear.com/LT3840

relaTeD parTs

Typical applicaTion

PART NUMBER DESCRIPTION

COMMENTS

LT3845A

60V, Low IQ, Single Output Synchronous Step-Down

DC/DC Controller

Synchronizable Fixed Frequency 100kHz to 600kHz, 4V ≤ VIN ≤ 60V,

1.23V ≤ VOUT ≤ 36V, IQ = 120µA, TSSOP-16 Package

LT3844

60V, Low IQ, Single Output Step-Down DC/DC Controller

Synchronizable Fixed Frequency 50kHz to 600kHz, 4V ≤ VIN ≤ 60V,

1.23V ≤ VOUT ≤ 36V, IQ = 120µA, TSSOP-16 Package

LTC3864

60V, Low IQ, Step-Down DC/DC Controller 100% Duty

Cycle Capability

Selectable Fixed Frequency 200kHz to 600kHz, 3.5V ≤ VIN ≤ 60V,

0.8V ≤ VOUT ≤ VIN, IQ = 40µA, MSOP-10E Package

LTC3891

60V, Low IQ, Synchronous Step-Down DC/DC Controller

Phase-Lockable Fixed Frequency 50kHz to 900kHz, 4V ≤ VIN ≤ 60V,

0.8V ≤ VOUT ≤ 24V, IQ = 50µA

LTC3890/

LTC3890-1/

LTC3890-2

60V, Low IQ, Dual 2-Phase Synchronous Step-Down

DC/DC Controller

Phase-Lockable Fixed Frequency 50kHz to 900kHz, 4V ≤ VIN ≤ 60V,

0.8V ≤ VOUT ≤ 24V, IQ = 50µA

LTC3859A

Low IQ, Triple Output Buck/Buck/Boost Synchronous

DC/DC Controller

All Outputs Remain in Regulation Through Cold Crank, 2.5V ≤ VIN ≤ 38V,

VOUT(BUCKS) Up to 24V, VOUT(BOOST) Up to 60V, IQ = 27µA

LT8705

30V VIN and VOUT Synchronous 4-Switch Buck-Boost

Controller

Synchronizable Fixed Frequency 100kHz to 400kHz, 2.8V ≤ VIN ≤ 80V,

1.3V ≤ VOUT ≤ 30V, Four Regulation Loops

Inverting Application, 24V Input to –15V, 10A

ICOMP

ICTRL

IMON

AUXSW2

AUXSW1

AUXBST

LT3840

3840 TA05

INTVCC

BOOST

SENSE+

SENSE–

GND

VIN

18V TO 36V

TK/SS

33nF

100pF

AUXVIN

UVLO

OVLO

1µF

4.7µF

1N4448

1µF

L1, 15µH

M1: INFINEON, BSC160N10NS3

M2: INFINEON, BSC070N1ONS3

L1: WÜRTH, 7443631500

L2: COILCRAFT, ME3220-333KL

D1: DIODES INC. PDS5100H

L2, 33µH

CIN

68µF

×2

80.6k

10k

110k

39.2k

7.68k

470pF

SYNC

MODE

RSENSE

49.9k

VOUT

–15V

2200pF

COUT2

330µF

×2

VOUT

–15V

10A

COUT1

10µF

×2

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