LTC3637
26
3637fa
For more information www.linear.com/LTC3637
LINEAR TECHNOLOGY CORPORATION 2013
LT 0514 • PRINTED IN USA
(408) 432-1900
●
FAX: (408) 434-0507
●
www.linear.com/LTC3637
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
PART NUMBER DESCRIPTION COMMENTS
LTC3639 150V, 100mA Synchronous Step-Down Regulator V
IN
: 4V to 150V, V
OUT(MIN)
= 0.8V, I
Q
= 12µA, I
SD
= 1.4µA,
MSOP-16(12)E
LTC3630A 76V, 500mA Synchronous Step-Down DC/DC Converter V
IN
: 4V to 76V, V
OUT(MIN)
= 0.8V, I
Q
= 12µA, I
SD
= 3µA,
3 × 5 DFN-16, MSOP-16(12)E
LTC3642 45V (Transient to 60V) 50mA Synchronous Step-Down
DC/DC Converter
V
IN
: 4.5V to 45V, V
OUT(MIN)
= 0.8V, I
Q
= 12µA, I
SD
= 3µA,
3 × 3 DFN-8, MSOP-8
LTC3631 45V (Transient to 60V) 100mA Synchronous Step-Down
DC/DC Converter
V
IN
: 4.5V to 45V, V
OUT(MIN)
= 0.8V, I
Q
= 12µA, I
SD
= 3µA,
3 × 3 DFN-8, MSOP-8
LTC3632 50V (Transient to 60V) 20mA Synchronous Step-Down
DC/DC Converter
V
IN
: 4.5V to 50V, V
OUT(MIN)
= 0.8V, I
Q
= 12µA, I
SD
= 3µA,
3 × 3 DFN-8, MSOP-8
LT
®
3990 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,
3 × 3 DFN-10, MSOP-16E
LTC3891 Low I
Q
, 60V Synchronous Step-Down Regulator V
IN
: 4V to 60V, V
OUT(MIN)
= 0.8V, I
Q
= 50µA, I
SD
= 14µA,
3 × 4 QFN-20, TSSOP-20E
RELATED PARTS
TYPICAL APPLICATION
5.5V to 76V Input to 5V Output, 1A Step-Down Regulator Efficiency vs Load Current
SW
V
IN
5.5V TO 76V
LTC3637
L1
5.2µH
C
OUT
47µF
C
IN
: TDK CGA6N3X7R2A225K
C
OUT
: MURATA GCM32ER70J476KE19L
D1: VISHAY SS2H10
L1: COILCRAFT MSS1038T-522
3637 TA07a
C
IN
2.2µF
V
OUT
5V
1A
GND
V
FB
SS
V
PRG1
RUN
D1
V
PRG2
OVLO
I
SET
FBO
V
IN
LOAD CURRENT (mA)
30
EFFICIENCY (%)
90
100
20
10
80
50
70
60
40
0.1 10 100 1000
0
1
V
IN
= 12V
V
IN
= 24V
V
IN
= 70V
V
OUT
= 5V
