1

LT1300

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Up to 220mA Output Current at 5V from 2V Supply

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Supply Voltage as Low as 1.8V

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Up to 88% Efficiency

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Small Inductor –10

µH

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120

µA Quiescent Current

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Shutdown to 10

µA

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Programmable 3.3V or 5V Output

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s

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Uses Inexpensive Surface Mount Inductors

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8-Lead DIP or SOIC Package

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Palmtop Computers

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Portable Instruments

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Bar-Code Scanners

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DC/DC Converter Module Replacements

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Battery Backup Supplies

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Personal Digital Assistants

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PCMCIA Cards

The LT1300 is a micropower step-up DC/DC converter that

utilizes Burst Mode™ operation. The device can deliver 5V

or 3.3V from a two-cell battery input. It features program-

mable 5V or 3.3V output via a logic-controlled input, no-

load quiescent current of 120

µAandashutdownpinwhich

reduces supply current to 10

µA.Theon-chippowerswitch

has a low 170mV saturation voltage at a switch current of

1A, a four-fold reduction over prior designs. A 155kHz

internal oscillator allows the use of extremely small sur-

face mount inductors and capacitors. Operation is guaran-

teed at 1.8V input. This allows more energy to be extracted

be used to program peak switch current with a single

resistor allowing the use of less expensive and smaller

inductors and capacitors in lighter load applications. The

LT1300 is available in an 8-lead SOIC package, minimizing

board space requirements. For a 5V/12V Selectable Out-

put Converter see the LT1301. For increased output cur-

rent see the LT1302.

FEATURES

Micropower High Efficiency

3.3/5V Step-Up DC/DC Converter

Two-Cell to 3.3V/5V Step-Up Converter

5V Output Efficiency

L1 = COILCRAFT DO1608-103

OR SUMIDA CD54-100

C1 = AVX TPSD107M010R0100

OR SANYO OS-CON 16SA100M

D1 = MBRS130LT3

OR 1N5817

C1

100µF

5V/3.3V

OUTPUT

+

+

L1

10µH

D1

C1

100µF

2

×

AA

CELL

SW

PGND

GND

SENSE

LT1300

SELECT

LT1300 TA1

5V/3.3V

SELECT

SHDN

SHUTDOWN

N/C

2

67

4

5

81

3

LOAD CURRENT (mA)

10

100

500

LT1300 TA2

1

74

76

78

80

82

90

84

86

88

Burst Mode is a trademark of Linear Technology Corporation.