LT1940 Ver la hoja de datos (PDF) - Linear Technology

Número de pieza

componentes Descripción

Fabricante

LT1940

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

Linear Technology 

TYPICAL APPLICATIO S

TFT LCD Supply

19V REGULATED

INPUT +

22µF

4.7µF

D3

VIN

BOOST2 BOOST1

L2

4.7µH

5V

1.2A

30.1k

0.1µF

D1

LT1940

SW2

SW1

FB2

FB1

D4B

22Ω

D4A

D6

0.1µF 0.022µF L1

15µH

D2

100k

10k

10µF

220pF

VC2

VC1

10k

PG2

PG1

1.5nF

RUN/SS2 RUN/SS1

1nF

GND

1nF

10.7k

20k

10µF

1nF 220pF

D1, D2: ON SEMI MBRM140T3

D3: CENTRAL CMPD914

D4, D5: BAT-54S

D6, D7: 6.2V ZENER

L1: SUMIDA CDRH4D28-4R7

L2: SUMIDA CDRH5D28-150

LT1940/LT1940L

25V

3mA

C10

1µF

D5B 22Ω

13V

300mA

D5A

22Ω

D7

1µF

–5V

3mA

1µF

1940 TA08

PACKAGE DESCRIPTIO

FE Package

16-Lead Plastic TSSOP (4.4mm)

(Reference LTC DWG # 05-08-1663)

Exposed Pad Variation BA

2.74

(.108)

4.90 – 5.10*

(.193 – .201)

2.74

(.108)

16 1514 13 12 1110 9

6.60 ±0.10

4.50 ±0.10

SEE NOTE 4

2.74

(.108)

0.45 ±0.05

1.05 ±0.10

0.65 BSC

RECOMMENDED SOLDER PAD LAYOUT

4.30 – 4.50*

(.169 – .177)

0° – 8°

2.74 6.40

(.108) BSC

12345678

1.10

(.0433)

MAX

0.09 – 0.20

(.0036 – .0079)

0.45 – 0.75

(.018 – .030)

NOTE:

1. CONTROLLING DIMENSION: MILLIMETERS

2.

DIMENSIONS

ARE

IN

MILLIMETERS

(INCHES)

3. DRAWING NOT TO SCALE

0.65

(.0256)

BSC

0.195 – 0.30

(.0077 – .0118)

0.05 – 0.15

(.002 – .006)

FE16 (BA) TSSOP 0203

4. RECOMMENDED MINIMUM PCB METAL SIZE

FOR EXPOSED PAD ATTACHMENT

*DIMENSIONS DO NOT INCLUDE MOLD FLASH. MOLD FLASH

SHALL NOT EXCEED 0.150mm (.006") PER SIDE

Information furnished by Linear Technology Corporation is believed to be accurate and reliable.

However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-

tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.

1940fa

19

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