1

LT1308A/LT1308B

1308abfa

High Current, Micropower

Single Cell, 600kHz

DC/DC Converters

■

Fixed Frequency Operation: 600kHz

■

Automatic Burst Mode

Light Load (LT1308A)

■

μA (Max)

■

Improved Accuracy Low-Battery Detector

Reference: 200mV

±2%

The LT

step-up DC/DC converters that operate over a 1V to 10V

input voltage range. They are improved versions of the

LT1308 and are recommended for use in new designs. The

LT1308A features automatic shifting to power saving

Burst Mode operation at light loads and consumes just

140

μA at no load. The LT1308B features continuous

switching at light loads and operates at a quiescent current

of 2.5mA. Both devices consume less than 1

μA in

shutdown.

Low-battery detector accuracy is significantly tighter than

the LT1308. The 200mV reference is specified at

±2% at

room and

±3% over temperature. The shutdown pin

enables the device when it is tied to a 1V or higher source

and the switch voltage rating has been increased to 36V,

enabling higher output voltage applications.

The LT1308A/LT1308B are available in the 8-lead SO and

the 14-lead TSSOP packages.

Figure 1. LT1308B Single Li-Ion Cell to 5V/1A DC/DC Converter

Converter Efficiency

SW

FB

LT1308B

L1

4.7

μH

D1

LBO

LBI

47k

R2

100k

R1*

309k

5V

1A

100pF

1308A/B F01a

C1

47

μF

C2

220

μF

Li-Ion

CELL

GND

SHDN

SHUTDOWN

C1: AVX TAJC476M010

C2: AVX TPSD227M006

D1: IR 10BQ015

+

+

L1: MURATA LQH6C4R7

LOAD CURRENT (mA)

1

95

90

85

80

75

70

65

60

55

50

10

100

1000

1308A/B F01b

APPLICATIO S

FEATURES

TYPICAL APPLICATIO

DESCRIPTIO

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

Mode is a registered trademark of Linear Technology Corporation. All other trademarks are

the property of their respective owners.