16
LTC1649
1649fa LT/TP 0501 REV A 2K • PRINTED IN USA
LINEAR TECHNOLOGY CORPORATION 1998
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900
●
FAX: (408) 434-0507
●
www.linear-tech.com
TYPICAL APPLICATIO
U
SSTL Logic Termination Supply
V
CC
V
OUT
= 0.45V
IN
AT ±5A
= 1.48V AT V
IN
= 3.3V
I
MAX
SHDN
1µF
CERAMIC
G2
FBNC
V
IN
V
IN
3.3V
C
+
LTC1649
P
VCC2
P
VCC1
G1
I
FB
COMP
SS C
–
GND CP
OUT
1µF
CERAMIC
10µF
MBR0530
0.1µF
0.01µF
7.5k
L
EXT
1.5µH
220pF
10µF
CERAMIC
0.1µF
MBR0530
22Ω
Q1
1/2
Si9802
1500µF
SHDN
1649 TA04
+
+
1500µF
+
Q2
1/2
Si9802
R1
18.2k
R2
15k
+
–
+
–
10k
10k
10k
4.7k
2200pF
50pF
1/2 LT1211
1/2 LT1211
Si9802 = SILICONIX
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PART NUMBER DESCRIPTION COMMENTS
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IN
and C
OUT
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IN
to Two Output Voltages Using 5V Logic
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Supply, >90% Efficiency
