LTC3775 View Datasheet(PDF) - Linear Technology

Part Name

Description

Manufacturer

LTC3775

High Frequency Synchronous Step-Down Voltage Mode DC/DC Controller

Linear Technology 

TYPICAL APPLICATIONS

8V to 36V Input, 2.5V/10A Output at 500kHz

LTC3775

R4

43.2k

R5

10k

CB

0.1μF

RILIMB

133k

DB

CVCC

4.7μF

CSS

0.01μF

RSET

39.2k

C3

1500pF

C2

330pF

R3

390Ω

RA RB

10k 3.16k

R2

C1 15k

2200pF

COUT: SANYO 4TPD330M

DB: CMDSH4E

L1: TOKO FDA1254-1R2M

QB,QT: INFINEON BSZ097N04LS

BOOST VIN ILIMT

ILIMB

SENSE

INTVCC

TG

LTC3775

SS

SW

FREQ

BG

RUN/SHDN

FB

PGND

MODE/SYNC

COMP

SGND

RILIMT

464Ω RSENSE

0.003Ω

CF

220pF

+ CIN1

330μF

35V

VIN

8V TO 36V

QT

L1

1.2μH

+

QB

COUT

330μF

4V

s3

VOUT

2.5V

10A

3775 TA03

Efficiency and Power Loss

vs Load Current

100

5

VIN = 12V

90 VOUT = 2.5V

CONTINUOUS MODE

80 SW FREQ = 500kHz

4

70

60

3

50

EFFICIENCY

40

2

30

POWER LOSS

20

1

10

0

0.01

0.1

1

LOAD CURRENT (A)

0

10

3775 TA03b

VOUT(AC)

100mV/DIV

Load Step

IL

10A/DIV

VIN = 12V

50μs/DIV

VOUT = 2.5V

LOAD = 0A TO 10A TO 0A

MODE = 0V

SW FREQ = 500kHz

Start-Up

VOUT

1V/DIV

IL

5A/DIV

SWITCHOVER

FROM PULSE-

SKIPPING TO

CONTINUOUS

MODE

VSS

1V/DIV

3775 TA03c

VIN = 12V

VOUT = 2.5V

CSS = 0.01μF

2ms/DIV

MODE = 0V

SW FREQ = 500kHz

3775 TA03d

3775fa

29

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