LT1020 データシートの表示（PDF） - Linear Technology

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LT1020

Micropower Regulator and Comparator

Linear Technology 

LT1020

TYPICAL APPLICATI

S

50mA Battery Charger and Regulator

+

+

10µF

10µF 51k

VIN*

2N2905

6

* VIN MUST BE GREATER THAN THE

BATTERY VOLTAGE PLUS 1.3V

20k

220k

8

43

VIN

2

VOUT

LT1020

7

2.5V

1M

11

FB

1M

9

0.001µF

10µF

5V

10µF

6V

BATTERY

3.9Ω

1020 TA21

Switching Preregulator for Wide Input Voltage Range

7.5V TO 30V

VIN

100µF

3.3M

TO

VREF

(PIN4)

1.8M

2N3904

2N3904

1M

1k

30k

2N3906

10k

100k

LT1020

COMPARATOR

6

MAINTAINS LOW IQ (< 100µA)

FOR ALL INPUT VOLTAGES

SWITCHER EFFICIENCY = 85%

POST REGULATOR EFFICIENCY = 82%

2M

OVERALL EFFICIENCY = 70%

SWITCHING REGULATOR OUTPUT =

2.5 × (1 + RA/RB). FOR A CLEAN OUTPUT

FROM THE LINEAR REGULATOR SET TO VOUT + 1.2V

2N2222

SWITCHING

REGULATOR

OUTPUT

4mH

2M

8

30k

POST REGULATOR

3 VIN

LT1020 VOUT 2

VREF

FB

4

11

VOUT

5V

100mA

22µF

RA

7

1.5M

RB

1M

0.001µF

30k

100µF

0.01µF 220k

220k

1020 TA22

14

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