20

LT1339

©LINEAR TECHNOLOGY CORPORATION 1997

1339fa LT/TP 0299 2K REV A • PRINTED IN THE USA

48V to 5V 50A DC/DC Converter with Input Supply Start-Up Protection

RELATED PARTS

PART NUMBER

DESCRIPTION

COMMENTS

LT1158

Half-Bridge N-Channel MOSFET Driver

Current Limit Protection, 100% of Duty Cycle

LT1160

Half-Bridge N-Channel MOSFET Driver

Up to 60V Input Supply, No Shoot-Through

LT1162

Dual Half-Bridge N-Channel MOSFET Driver

LT1336

Half-Bridge N-Channel MOSFET Driver

Smooth Operation at High Duty Cycle (95% to 100%)

LTC

High Power Step-Down Switching Regulator Controller

Excellent for 5V to 3.xV Up to 50A

LTC1435A

High Efficiency, Low Noise Current Mode Step-Down DC/DC Converter

Drives Synchronous N-Channel MOSFETs

LTC1438

Dual High Efficiency, Low Noise Synchronous Step-Down Controller

Tight 1% Reference

LT1680

High Power DC/DC Current Mode Step-Up Controller

High Side Current Sense, Up to 60V Input

SYNC

CT

SL/ADJ

SS

SGND

TG

TS

BG

PGND

PHASE

RUN/SHDN

12V

47

µF

IRFZ44

× 2

IRFZ44

× 4

L1

40

µH

5V AT 50A

1k

3k

LT1339

+

CBST

1

µF

+

2200

µF

6.3V,

× 4

+

22k

51k

10k

CT

2200pF

0.1

µF

1339 TA01

D1 = IR30BQ060

× 8

Q1, Q3 = FMMT619; Q2, Q4 = FMMT720

L1 = Kool M

Kool M

µ IS A REGISTERED TRADEMARK OF MAGNETICS, INC.

1

µF

DBST

IN5819

Q1

Q2

Q3

Q4

D2

MBR0520

D4

IN914

D1

0.002

Ω

1500

µF

63V,

× 6

+

48V

1.2k

D3

MMSZ4684

10k

50mA

48V to 5V Efficiency

OUTPUT CURRENT (AMPS)

0

100

95

90

85

80

75

70

65

60

55

50

40

LT1339 • TA02

10

20

30

50

Linear Technology Corporation

1630 McCarthy Blvd., Milpitas, CA 95035-7417