LT1931/LT1931A
U
TYPICAL APPLICATIO S
SLIC Power Supply with –21.6V and –65V Outputs, Uses Soft-Start
L1
10µH
R1
1Ω
V
IN
5V
C1
C2
1µF
35V
4.7µF
16V
V
IN
SW
D1
R
SS
15k
3
2
1
LT1931
SHDN
COM
C5
4.7µF
25V
NFB
V
SS
GND
V
OUT1
–21.6V
48mA*
R2
1k
R3
16.2k
C3
1µF
35V
C8
1000pF
C
SS
68nF
R4
2.7k
D2
D3
3
2
1
C6
4.7µF
25V
*TOTAL OUTPUT POWER NOT TO EXCEED 1.3W
C1 TO C7: X5R OR X7R
D1, D2: BAV99 OR EQUIVALENT
L1: SUMIDA CR43-100
C4
1µF
35V
3
2
1
C7
4.7µF
25V
V
OUT2
–65V
1931 TA09
20mA*
U
PACKAGE DESCRIPTIO
S5 Package
5-Lead Plastic TSOT-23
(Reference LTC DWG # 05-08-1635)
0.62
MAX
0.95
REF
2.90 BSC
(NOTE 4)
1.22 REF
1.50 – 1.75
(NOTE 4)
2.80 BSC
1.4 MIN
3.85 MAX 2.62 REF
PIN ONE
RECOMMENDED SOLDER PAD LAYOUT
PER IPC CALCULATOR
0.30 – 0.45 TYP
5 PLCS (NOTE 3)
0.95 BSC
0.80 – 0.90
0.20 BSC
DATUM ‘A’
0.01 – 0.10
1.00 MAX
0.30 – 0.50 REF
1.90 BSC
0.09 – 0.20
(NOTE 3)
NOTE:
S5 TSOT-23 0302 REV B
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
1931fa
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-
tationthattheinterconnectionofitscircuitsasdescribedhereinwillnotinfringeonexistingpatentrights.
11
Linear [ Linear ]
