Datasheet

11
LT1931/LT1931A
1931fa
U
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
U
V
IN
V
IN
5V
V
SS
SW
L1
10µH
GND
R2
1k
LT1931
NFB
SHDN
R
SS
15k
R3
16.2k
R1
1Ω
R4
2.7k
C8
1000pF
C1
4.7µF
16V
C
SS
68nF
C3
1µF
35V
C4
1µF
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
4.7µF
25V
32
D3
C6
4.7µF
25V
32
1
D2
1
1931 TA09
C5
4.7µF
25V
V
OUT1
–21.6V
48mA*
COM
V
OUT2
–65V
20mA*
C2
1µF
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)