LTC1148 View Datasheet(PDF) - Linear Technology

Part Name

Description

Manufacturer

LTC1148

High Efficiency Synchronous Step-Down Switching Regulators

Linear Technology 

LTC1148

LTC1148-3.3/LTC1148-5

TYPICAL APPLICATION

VIN

10V TO 18V

1N4148

220Ω

+

2N3906

20k 220Ω

2N2222

470nF

MUR110

VN2222LL

N-CH

D1

IRFZ44 1N5818

CIN

2700µF

35V

×2

+ 1µF

CT

820pF

CC

3300pF

RC

510Ω

1 P-DRIVE N-DRIVE 14

2 NC

NC 13

LTC1148HV-5

3 VIN

PGND 12

*L

33µH

4

CT

SGND 11

5

10

INTVCC SHUTDOWN

SHUTDOWN

6 ITH

7 SENSE–

NC 9

SENSE+ 8

100Ω

1000pF

100Ω

*COILTRONICS CTX33-10-KM

22k

**DALE LVR-3-0.01

N-CH

IRFZ44

+

RSENSE**

0.01Ω

COUT

2200µF

16V

×3

VOUT

5V/8A

LTC1148 • F18

Figure 18. All N-Channel 5V/8A High Efficiency Regulator

(Burst Mode Operation Suppressed)

100

VIN = 10V

90

VIN = 14V

80

70

60

0.1

1

LOAD CURRENT (A)

10

LTC1148 • F19

Figure 19. All N-Channel 5V/8A Efficiency

For additional high efficiency application

circuits, see Application Notes 54, 58 and 66

RELATED PARTS

PART NUMBER

LTC1142

LTC1143

LTC1147

LTC1149

LTC1159

LTC1174

LTC1265

LTC1435A

LTC1538-AUX

DESCRIPTION

Dual High Efficiency Synchronous Step-Down Switching Regulator

Dual High Efficiency Step-Down Switching Regulator Controller

High Efficiency Step-Down Switching Regulator Controller

High Efficiency Synchronous Step-Down Switching Regulator

High Efficiency Synchronous Step-Down Switching Regulator

High Efficiency Step-Down and Inverting DC/DC Converter

1.2A, High Efficiency Step-Down DC/DC Converter

High Efficiency Low Noise Synchronous Step-Down Switching Regulator

Dual High Efficiency, Low Noise, Synchronous Step-Down

Switching Regulator

COMMENTS

Dual LTC1148

Nonsynchronous Dual Output

Nonsynchronous Equivalent to LTC1148, 8-Pin

VIN < 48V, Standard Threshold MOSFETs

VIN < 40V, Logic Level MOSFETs

Nonsynchronous 8-Pin Internal Switch

Nonsynchronous Internal Switch

Synchronous N-Channel, Constant Frequency

Auxiliary Linear Regulator, 5V Standby in Shutdown

20 Linear Technology Corporation

1630 McCarthy Blvd., Milpitas, CA 95035-7417

(408)432-1900q FAX:(408)434-0507 q www.linear-tech.com

114835fc LT/GP 1098 2K REV C • PRINTED IN USA

© LINEAR TECHNOLOGY CORPORATION 1993

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