11

LT1931/LT1931A

1931fa

PACKAGE DESCRIPTIO

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.

SLIC Power Supply with – 21.6V and – 65V Outputs, Uses Soft-Start

TYPICAL APPLICATIO S

5V

SW

L1

10

µH

GND

R2

1k

LT1931

NFB

SHDN

15k

R3

16.2k

R1

1

Ω

R4

2.7k

C8

1000pF

C1

4.7

µF

16V

68nF

C3

1

µF

35V

C4

1

µF

35V

*TOTAL OUTPUT POWER NOT TO EXCEED 1.3W

C1 TO C7: X5R OR X7R

D1, D2: BAV99 OR EQUIVALENT

L1: SUMIDA CR43-100

C7

4.7

µF

25V

32

D3

C6

4.7

µF

25V

32

1

D2

1

1931 TA09

C5

4.7

µF

25V

–21.6V

48mA*

COM

– 65V

20mA*

C2

1

µF

35V

32

D1

1

1.50 – 1.75

(NOTE 4)

2.80 BSC

0.30 – 0.45 TYP

5 PLCS (NOTE 3)

DATUM ‘A’

0.09 – 0.20

(NOTE 3)

S5 TSOT-23 0302 REV B

PIN ONE

2.90 BSC

(NOTE 4)

0.95 BSC

1.90 BSC

0.80 – 0.90

1.00 MAX

0.01 – 0.10

0.20 BSC

0.30 – 0.50 REF

NOTE:

1. DIMENSIONS ARE IN MILLIMETERS

2. DRAWING NOT TO SCALE

3. DIMENSIONS ARE INCLUSIVE OF PLATING

4. DIMENSIONS ARE EXCLUSIVE OF MOLD FLASH AND METAL BURR

5. MOLD FLASH SHALL NOT EXCEED 0.254mm

6. JEDEC PACKAGE REFERENCE IS MO-193

3.85 MAX

0.62

MAX

0.95

REF

RECOMMENDED SOLDER PAD LAYOUT

PER IPC CALCULATOR

1.4 MIN

2.62 REF

1.22 REF

S5 Package

5-Lead Plastic TSOT-23

(Reference LTC DWG # 05-08-1635)