1

LT1302/LT1302-5

Micropower

High Output Current

Step-Up Adjustable and

Fixed 5V DC/DC Converters

Figure 1. 2-Cell to 5V/600mA DC/DC Converter

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FEATURE

DESCRIPTIO

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5V at 600mA or 12V at 120mA from 2-Cell Supply

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200

µA Quiescent Current

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Logic Controlled Shutdown to 15

µA

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Burst Mode

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Current Mode Operation for Excellent

Line and Load Transient Response

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Available in 8-Lead SO or PDIP

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Operates with Supply Voltage as Low as 2V

The LT

converters that maintain high efficiency over a wide

range of output current. They operate from a supply

voltage as low as 2V and feature automatic shifting

between Burst Mode operation at light load, and current

mode operation at heavy load.

The internal low loss NPN power switch can handle

current in excess of 2A and switch at frequencies up to

400kHz. Quiescent current is just 200

µA and can be

further reduced to 15

µA in shutdown.

Available in 8-pin PDIP or 8-pin SO packaging, the LT1302/

LT1302-5 have the highest switch current rating of any

similarly packaged switching regulators presently on the

market.

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APPLICATI

, LTC and LT are registered trademarks of Linear Technology Corporation.

Burst Mode is a trademark of Linear Technology Corporation.

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Notebook and Palmtop Computers

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Portable Instruments

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Personal Digital Assistants

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Cellular Telephones

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Flash Memory

APPLICATI

TYPICAL

+

NC

C3

0.1

µF

SHUTDOWN

SW

PGND

SHDN

SENSE

GND

2

20k

0.01

µF

C1

100

µF

D1

+

C2

100

µF

L1

10

µH

2 CELLS

LT1302 • F01

C1 = C2 = SANYO OS-CON

L1 = COILTRONICS CTX10-3

COILCRAFT DO3316-103

OUTPUT

5V

600mA

1

8

7

65

3

4

D1 = MOTOROLA MBRS130LT3

LT1302-5

LOAD CURRENT (mA)

1

78

80

82

84

86

10

100

1000

LT1302 • TA02

76

74

72

70

88

90

2-Cell to 5V Converter Efficiency