LT1940 데이터 시트보기 (PDF) - Linear Technology

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LT1940

Dual Monolithic 1.4A, 1.1MHz Step-Down Switching Regulator

Linear Technology 

LT1940/LT1940L

TYPICAL APPLICATIO S

VIN

4.7V TO 14V

3.3V and 1.8V Outputs with Sequencing

C3

4.7µF

D3

VIN

D4

BOOST1 BOOST2

OUT1

1.8V

1.4A

L1

2.2µH

10.0k

0.1µF

D1

LT1940

SW1

SW2

FB1

FB2

0.1µF

L2

3.3µH

D2

16.5k

C1

22µF

22.6k 20k

220pF

VC1

VC2

RUN/SS1

PG1

RUN/SS2

PG2

1nF

GND

15k

10.0k

330pF

100k

OUT2

3.3V

1A

(1.4A FOR VIN > 5V)

C2

10µF

VIN

2V/DIV

VOUT1

2V/DIV

VOUT2

2V/DIV

POWER GOOD

2V/DIV

C1: TAIYO YUDEN JMK316BJ226ML

C2: TAIYO YUDEN JMK316BJ106ML

C3: TAIYO YUDEN EMK316BJ475ML

D1, D2: MICROSEMI UPS120

D3, D4: CENTRAL CMDSH-3

L1: SUMIDA CR43-2R2

L2: SUMIDA CR43-3R3

POWER

1940 TA01 GOOD

Start-Up Waveforms

50µs/DIV

1940 TA01b

OUT1

3.3V

1.2A

C1 +

100µF

6.3V

5V/3.3V with Tantalum Output Capacitors

VIN

7V TO 25V

D3

L1

3.3µH

C3

4.7µF

0.1µF

VIN

BOOST1 BOOST2

LT1940

SW1

SW2

0.1µF

D4

L2

4.7µH

OUT2

5V

1.2A

D1

D2

16.5k

FB1

FB2

30.1k

10.0k 10.0k

220pF

100k

VC1

VC2

PG1

PG2

RUN/SS1 RUN/SS2

1nF

GND

1nF

20k

10.0k

100pF

100k

+ C2

47µF

10V

3V3

GOOD

C1: AVX TPSC107M010R0150

C2: AVX TPSC476M010R0350

C3: TAIYO YUDEN TMK325BJ475ML

D1, D2: MICROSEMI UPS140 OR ON SEMI MBRM140

D3, D4: CENTRAL CMDSH-3

L1: SUMIDA CDRH4D28-3R3

L2: SUMIDA CDRH4D28-4R7

5 GOOD

1940 TA03

1940fa

17

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