LT8705MPFE#PBF datasheet(44/44 Pages) LINER

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LT8705

8705fe

For more information www.linear.com/LT8705



LINEAR TECHNOLOGY CORPORATION 2013

LT 0615 REV E • PRINTED IN USA

relaTeD parTs

Typical applicaTion

PART NUMBER DESCRIPTION

COMMENTS

LT3791-1

60V High Efficiency (Up to 98%) Synchronous 4-Switch

Buck-Boost DC/DC Controller

4.7V ≤ VIN ≤ 60V, 1.2V ≤ 60V, Regulates VOUT, IOUT or IIN, TSSOP-38

LTC3789

High Efficiency (Up to 98%) Synchronous 4-Switch

Buck-Boost DC/DC Controller

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

LT3758

High Input Voltage, Boost, Flyback, SEPIC and Inverting

Controller

5.5V ≤ VIN ≤ 100V, Positive or Negative VOUT, 3mm × 3mm DFN-10

or MSOP-10E

LTC3115-1

40V, 2A Synchronous Buck-Boost DC/DC Converter

2.7V ≤ VIN ≤ 40V, 2.7V ≤ VOUT ≤ 40V, 4mm × 5mm DFN-16, TSSOP-20

LTM4609

High Efficiency Buck-Boost DC/DC µModule Regulator

4.5V ≤ VIN ≤ 36V, 0.8V ≤ VOUT ≤ 34V, 15mm × 15mm × 2.8mm

12V Output Converter Accepts 4V to 80V Input (5.5V Minimum to Start)

8705 TA03a

CSPOUT

CSNOUT

EXTVCC

FBOUT

INTVCC

GATEVCC

SRVO_FBIN

SRVO_FBOUT

SRVO_IIN

SRVO_IOUT

IMON_IN

IMON_OUT

SYNC

CLKOUT

202kHz

16.5k

CSNIN

TG1 BOOST1

0.22µF

TO DIODE

DB1

TO DIODE

DB2

×2

SW1 BG1 CSP

CSN

LT8705

GND BG2 SW2 BOOST2

VOUT

12V

5.0A (VIN ≥ 5.5V)

4.5A (VIN ≥ 5.0V)

4.0A (VIN ≥ 4.5V)

3.5A (VIN ≥ 4.0V)

VIN

4V TO 80V

(INCREASED

VOUT RIPPLE

FOR VIN > 60V)

TG2

CSPIN

VIN

SHDN

SWEN

LDO33

MODE

FBIN

10nF

220pF

215k

38.3k

20k

1µF

4.7µF

11.3k

CIN1: 220µF, 100V

CIN2: 4.7µF, 100V, TDK C4532X7S2A475M

COUT1A, COUT1B: 22µF, 25V, TDK C4532X7R1E226M

COUT2: 100µF, 16V, SANYO OS-CON 16SA100M

COUT3: 470µF, 16V

DB1, DB2: CENTRAL SEMI CMMR1U-02-LTE

L1: 15µH, WURTH 7443631500

M1, M2: FAIRCHILD FDMS86101

M3, M4: FAIRCHILD FDMS7692

*2 FROM TG1 TO EACH SEPARATE M1 GATE

102k

CIN1

CIN2

×6

COUT1A

×2

DB1

DB2

4.7µF

22nF

BOOST1

100k

4.7µF

COUT1B

×3

COUT2

×2

COUT3

×3

BOOST2

26.1k

15µH

×2

1nF

LOAD CURRENT (A)

8705 TA03c

100

VIN = 60V

VIN = 40V

VIN = 20V

VIN = 12V

VIN = 5V

VOUT

200mV/DIV

VIN

20V/DIV

10ms/DIV

ILOAD = 2A

8705 TA03c

Efficiency vs Output Current

Input Transient (4V to 80V)

LinearTechnology Corporation

1630 McCarthy Blvd., Milpitas, CA 95035-7417

(408)432-1900 ● FAX: (408) 434-0507 ● www.linear.com/LT8705

LT8705MPFE#PBF Datasheet(PDF) 44 Page - Linear Technology

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