LT8705 datasheet(44/44 Pages) LINER

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LTC7812

7812fc

For more information www.linear.com/LTC7812

LT 0517 REV C • PRINTED IN USA

www.linear.com/LTC7812

RELATED PARTS

TYPICAL APPLICATION

PART NUMBER DESCRIPTION

COMMENTS

LTM4609

36VIN, 34VOUT, Buck-Boost µModule Regulator

4.5V ≤ VIN ≤ 36V, 0.8V ≤ VOUT ≤ 34V, Up to 4A, 15mm × 15mm LGA and

BGA Packages

LTM8056

58VIN, 48VOUT, Buck-Boost µModule Regulator

5V ≤ VIN ≤ 58V, 1.2V ≤ VOUT ≤ 48V, Up to 5.4A, 15mm × 15mm × 4.92mm

BGA Package

LTC3789

High Efficiency Synchronous 4-Switch Buck-Boost

Controller

4V ≤ VIN ≤ 38V, 0.8V ≤ VOUT ≤ 38V, 4mm × 5mm QFN-28, SSOP-28

LT3790

60V 4-Switch Synchronous Buck-Boost Controller

4.7V ≤ VIN ≤ 60V, 1.2V ≤ VOUT ≤ 60V, TSSOP-38

LT8705

80V VIN and VOUT Synchronous 4-Switch Buck-Boost

DC/DC Controller

2.8V ≤ VIN ≤ 80V, 1.3V ≤ VOUT ≤ 80V, Regulates VOUT, IOUT, VIN, IIN, 5mm

× 7mm QFN-38, Modified TSSOP Package for High Voltage

LTC3786

Low IQ Synchronous Step-Up DC/DC Controller

4.5V (Down to 2.5V after Start-Up) ≤ VIN ≤ 38V, VOUT Up to 60V, IQ = 55µA

PLL Fixed Frequency 50kHz to 900kHz, 3mm × 3mm QFN-16, MSOP-16E

LTC3787

Low IQ, Multiphase, Dual Channel Single Output

Synchronous Step-Up DC/DC Controller

4.5V (Down to 2.5V after Start-Up) ≤ VIN ≤ 38V, VOUT up to 60V, PLL Fixed

Frequency 50kHz to 900kHz, IQ = 135µA

LTC3891

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

with 99% Duty Cycle

PLL Fixed Frequency 50kHz to 900kHz, 4V ≤ VIN ≤ 60V, 0.8V ≤ VOUT ≤ 24V,

IQ = 50µA

LTC3899

60V, Triple Output, Buck/Buck/Boost Synchronous

Controller with 29µA Burst Mode IQ

4.5V (Down to 2.2V after Start-Up) ≤ VIN ≤ 60V, VOUT Up to 60V, Buck

VOUT Range: 0.8V to 60V, Boost VOUT Up to 60V

LTC3859AL

38V, Low IQ, Triple Output, Buck/Buck/Boost Synchronous

Controller with 28µA Burst Mode IQ

4.5V (Down to 2.5V after Start-Up) ≤ VIN ≤ 38V, VOUT Up to 60V, Buck

VOUT Range: 0.8V to 24V, Boost VOUT Up to 60V

LTC3892/

LTC3892-1

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

Controller with 29µA Burst Mode IQ

4.5V ≤ VIN ≤ 60V, 0.8V ≤ VOUT ≤ 0.99VIN, 5mm × 5mm QFN-32,

TSSOP-28 Packages

Low EMI, Wide Input Range Pass-Through Cascaded Boost+Buck Regulator

VIN

5V TO 38V

DOWN TO

2.5V AFTER

START-UP

CIN1

33µF

CIN2,3

6.8µF

1000pF

CB2

0.1µF

4.7µF

DB1

DB2

CB1

0.1µF

VOUT

10V TO 16V*

8A**

VMID, 10V***

RSENSE2

RSENSE1

L2, 1µH

MBOT2

MTOP2

MTOP1

MBOT1

L1, 4.7µH

RB1

499k

RA1

26.1k

FREQ

INTVCC

VFB2

RUN1

4.75k

4.7nF

CSS2

0.01µF

CSS1

0.1µF

100pF

EXTVCC

PGOOD1

OV2

SS2

ITH1

SGND

7812 TA02

RUN2

ITH2

SENSE2–

SENSE2+

VFB1

PGND

VBIAS

TG2

SW2 BOOST2

BG2

BG1

BOOST1 SW1

TG1

SENSE1+ SENSE1–

PLLIN/MODE

TRACK/SS1

LTC7812

6.8nF

820pF

CMID1,2,3,4

6.8µF

COUT3

47µF

COUT1,2

22µF

CMID5

33µF

RB2

499k

RA2

68.1k

INTVCC

PGOOD1

OV2

MTOP1, MTOP2, MBOT1, MBOT2: INFINEON BSC027N04LS

L1: WURTH 7443320470

L2: WURTH 7443320100

CIN1, CMID5: KEMET T521X336M050ATE075

COUT3: KEMET T521V476M020ATE055

DB1, DB2: CENTRAL SEMI CMDSH-4E

**WHEN VIN < 8V, MAXIMUM LOAD CURRENT AVAILABLE IS REDUCED

***VMID = 10V WHEN VIN < 10V

VMID FOLLOWS VIN WHEN VIN > 10V

*VOUT = 10V WHEN VIN < 10V

VOUT = 16V WHEN VIN > 16V

VOUT FOLLOWS VIN WHEN VIN IS 10V TO 16V

LT8705 Datasheet(PDF) 44 Page - Linear Technology

LT8705 Datasheet(HTML) 44 Page - Linear Technology

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