LT1020(RevC) 데이터 시트보기 (PDF) - Linear Technology

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LT1020
(Rev.:RevC)

Micropower Regulator and Comparator

Linear Technology 

TYPICAL APPLICATIO S

Battery Backup Regulator

BATTERY

INPUT

3

VIN

LT1020

GND

9

2

VOUT

11

FB

INTERNAL PARASITIC

DIODES OF LT1020

VIN

VOUT

0.001µF

VOUT

5V

+

1M

2

VOUT

10µF

LT1020

3

VIN

11

FB

GND

50k

9

1020 TA13

MAIN

POWER

INPUT

1M

5V Regulator with Shutdown

VIN > 5.2V

IQ = 40µA

3

VIN

LT1020

2

VOUT

GND FB

9

11 100k

0.001µF

*TRANSISTOR USED BECAUSE OF LOW LEAKAGE

CHARACTERISTICS. TO TURN OFF THE OUTPUT

OF THE LT1020, FORCE FB (PIN 11) > 2.5V

+

1M

5V

10µF

NC

500k 2N3904*

1020 TA14

1M

LOGIC INPUT

Turn-Off at Dropout

R1

R2

1.5M

1M

VIN

8

3

2

VOUT

VOUT*

LT1020

0.001µF 1M

9

5

6

1M

DROP-

11

FB

OUT REF

1M

7 13 4

1.5M

0.047µF

*VOUT TURNS OFF AT DROPOUT.

VOUT TURN ON WHEN:

VIN × R2 = 2.5V

R1 + R2

10µF

1020 TA15

Current Limited 1 Amp Regulator

2.2k

0.5Ω*

VIN

3

VIN

LT1020

GND

9

VOUT 2

11

FB

0.22µF

270Ω

MJE2955

100k

2N3906*

VOUT

5V, 1A

220µF†

1020 TA16

100k

*SETS CURRENT LIMIT BUT INCREASES

DROPOUT VOLTAGE BY 0.5V

†MUST HAVE LOW ESR. SEVERAL 100µF

CAPACITORS CAN BE PARALLELED

LT1020

sn1020 1020fcs

11

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