LT3973/LT3973-3.3/LT3973-5
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For more information www.linear.com/LT3973
LINEAR TECHNOLOGY CORPORATION 2011
LT 0315 REV B • PRINTED IN USA
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900
●
FAX: (408) 434-0507
●
www.linear.com/LT3973
RELATED PARTS
PART NUMBER DESCRIPTION COMMENTS
LT3970/LT3970-
3.3/LT3970-5
40V, 350mA, 2.2MHz High Efficiency Micropower Step-Down DC/DC
Converter with I
Q
= 2.5µA
V
IN
= 4.2V to 40V, V
OUT(MIN)
= 1.21V, I
Q
= 2.5µA, I
SD
< 1µA,
3mm × 2mm DFN-10, MSOP-10
LT3990 62V, 350mA, 2.2MHz High Efficiency Micropower Step-Down DC/DC
Converter with I
Q
= 2.5µA
V
IN
= 4.2V to 62V, V
OUT(MIN)
= 1.21V, I
Q
= 2.5µA, I
SD
< 1µA,
3mm × 3mm DFN-16, MSOP-16E
LT3971 38V, 1.2A, 2.2MHz High Efficiency Micropower Step-Down DC/DC
Converter with I
Q
= 2.8µA
V
IN
= 4.3V to 38V, V
OUT(MIN)
= 1.2V, I
Q
= 2.8µA, I
SD
< 1µA,
3mm × 3mm DFN-10, MSOPE-10
LT3991 55V, 1.2A, 2.2MHz High Efficiency Micropower Step-Down DC/DC
Converter with I
Q
= 2.8µA
V
IN
= 4.3V to 55V, V
OUT(MIN)
= 1.2V, I
Q
= 2.8µA, I
SD
< 1µA,
3mm × 3mm DFN-10, MSOPE-10
LT3682 36V, 60V
MAX
, 1A, 2.2MHz High Efficiency Micropower Step-Down
DC/DC Converter
V
IN
= 3.6V to 36V, V
OUT(MIN)
= 0.8V, I
Q
= 75µA, I
SD
< 1µA,
3mm × 3mm DFN-12
TYPICAL APPLICATION
1.21V Step-Down Converter
V
IN
BOOST
LT3973
SWEN/UVLO
BD
PG
RT
C3
0.47µF
C2
47µF
C1
4.7µF
V
IN
4.2V TO 25V
V
OUT
1.21V
750mA
340k
f = 400kHz
L1
10µH
FB
OUT
GND
OFF ON
3973 TA10