LT1304 查看數據表（PDF） - Linear Technology

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LT1304

Micropower DC/DC Converters with Low-Battery Detector Active in Shutdown

Linear Technology 

LT1304/LT1304-3.3/LT1304-5

U

OPERATIO

Figure 12 shows overall energy conversion efficiency,

assuming availability of 6.5WH of battery energy. This

efficiency approximates the electrical efficiency at load

current levels from 1mA to 10mA, but drops severely at

load currents above 10mA (load power above 50mW). The

moral of the story is this: if your system needs 5V at more

than 40mA to 50mA, consider using a NiCd battery (1/10

the internal impedance) instead of a AA cell alkaline

battery.

100

90

80

70

60

50

40

30

20

10

0

1

10

LOAD CURRENT (mA)

100 200

1304 F12

Figure 12. Overall System Efficiency Including Battery Efficiency

vs Load Current. Internal Impedance of Alkaline AA Cells

Accounts for Rapid Drop in Efficiency at Higher Load Current

TYPICAL APPLICATIONS

Super BurstTM Low IQ DC/DC Converter

IQ ≈ 10µA

33µH**

MBR0530

2N3906

+

2 CELLS

100µF

200k

47k

VIN

LBO

SW

LBI

LT1304

FB

SHDN

ILIM

GND

0.01µF

3.83M*

5V

100mA

+

1.21M*

220µF

47k

22k

*1% METAL FILM

**SUMIDA CD54-330

1304 TA03

Super Burst Efficiency

90

80

VIN = 3V

70

VIN = 2V

60

50

40

0.01

0.1

1.0

10

LOAD CURRENT (mA)

100

1304 TA04

10

Super Burst is a trademark of Linear Technology Corporation.

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