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LT1172/HV

100kHz, 5A, 2.5A and 1.25A High Efficiency Switching Regulators

Linear Technology 

LT1170/LT1171/LT1172

TYPICAL APPLICATIO

Positive Current Boosted Buck Converter

+

C5*

100µF

VIN

28V

470Ω

2W

C3

0.47µF

R6

470Ω

C6

VIN

D2

0.002µF

1: N

VSW

LT1170

R7

R2

N ≈ 0.25

1k

FB

1.24k

D1

GND

VC

VIN

7

2

R3

680Ω

C4

0.01µF

6

LM308

R5

3

5k

C1

4

0.33µF

8

200pF

R4

1.24k

VOUT

R1 +

5V, 10A

5k

C2

5000µF

* REQUIRED IF INPUT LEADS ≥ 2"

1170/1/2 TA18

RELATED PARTS

PART NUMBER

LT1070/LT1071/LT1072

LT1074/LT1076

LT1082

LT1268/LT1268B

LT1269/LT1271

LT1270/LT1270A

LT1370

LT1371

LT1372/LT1377

LT1373

LT1374

LT1375/LT1376

LT1425

LT1507

LT1533

DESCRIPTION

5A/2.5A/1.25A High Efficiency Switching Regulators

5.5A/2A Step-Down Switching Regulators

1A, High Voltage, High Efficiency Switching Regulator

7.5A, 150kHz Switching Regulators

4A High Efficiency Switching Regulators

8A and 10A High Efficiency Switching Regulators

500kHz High Efficiency 6A Switching Regulator

500kHz High Efficiency 3A Switching Regulator

500kHz and 1MHz High Efficiency 1.5A Switching Regulators

250kHz Low Supply Current High Efficiency 1.5A Switching Regulator

4A, 500kHz Step-Down Switching Regulator

1.5A, 500kHz Step-Down Switching Regulators

Isolated Flyback Switching Regulator

500kHz Monolithic Buck Mode Switching Regulator

Ultralow Noise 1A Switching Regulator

COMMENTS

40kHz, VIN to 60V, VSW to 75V

100kHz, Also for Positive-to-Negative Conversion

VIN to 75V, VSW to 100V, Telecom

VIN to 30V, VSW to 60V

100kHz/60kHz, VIN to 30V, VSW to 60V

60kHz, VIN to 30V, VSW to 60V

High Power Boost, Flyback, SEPIC

Good for Boost, Flyback, Inverting, SEPIC

Directly Regulates ±VOUT

Low 1mA Quiescent Current

Synchronizable, VIN to 25V

Up to 1.25A Out from an SO-8

6W Output, ±5% Regulation,

No Optocoupler Needed

1.5A Switch, Good for 5V to 3.3V

Push-Pull, <100µVP-P Output Noise

20 Linear Technology Corporation

1630 McCarthy Blvd., Milpitas, CA 95035-7417q (408)432-1900

FAX: (408) 434-0507q TELEX: 499-3977 q www.linear-tech.com

117012fe LT/TP 1299 2K REV E • PRINTED IN USA

© LINEAR TECHNOLOGY CORPORATION 1991

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