LTC3630
TYPICAL APPLICATION
4.5V to 65V Input to 3.3V Output, 1.5A Regulator
V
X
22ꢀF
SYNC/MODE INTV
CC
C
PGOOD
PV
VCC
IN
IN
D1
C
1ꢀF
R
OSC
PV
105k
RT
BOOST
C
ITH
L1
33ꢀH
R
BST
0.22ꢀF
ITH
1nF
LTC3603
4.32k
V
*
IN
ITH
V
SW
LTC3630
SW
SW
IN
4.5V TO 65V
C
IN
R1
4.7ꢀF
V
L1
FB
200k
2.2ꢀH
R1
V
3.3V
1.5A
OUT
RUN
V
FB
105k
RUN
SW
PGND
PGND
R2
102k
I
SS
SET
TRACK/SS
PGND
R2
475k
C
V
PRG1
V
PRG2
FBO
FB
C
OUT
10pF
100ꢀF
GND
3630 TA06
C
: MURATA GCM32DR72A225KA64L
C
: TDK C3225X5ROJ107M
OUT
IN
C1: TDK CGA6P1X7R1C226M
L1: COILCRAFT MSS1048T-333
L2: VISHAY IHLP-2525CZ-01
*WHEN V > 15V, LTC3630 SWITCHES AND V IS REGULATED TO 15V; WHEN
IN
X
V
IN
< 15V, LTC3630 OPERATES IN DROPOUT AND V FOLLOWS V
X
IN
RELATED PARTS
PART NUMBER DESCRIPTION
COMMENTS
LTC3642
LTC3631
LTC3632
LTC3103
LTC3104
LT3970
45V (Transient to 60V) 50mA Synchronous Step-Down
DC/DC Converter
V : 4.5V to 45V, V
= 0.8V, I = 12ꢀA, I = 3ꢀA,
IN
OUT(MIN) Q SD
3 × 3 DFN-8, MSOP-8
45V (Transient to 60V) 100mA Synchronous Step-Down
DC/DC Converter
V : 4.5V to 45V, V
= 0.8V, I = 12ꢀA, I = 3ꢀA,
Q SD
IN
OUT(MIN)
3 × 3 DFN-8, MSOP-8
50V (Transient to 60V) 20mA Synchronous Step-Down
DC/DC Converter
V : 4.5V to 50V, V
= 0.8V, I = 12ꢀA, I = 3ꢀA,
Q SD
IN
OUT(MIN)
3 × 3 DFN-8, MSOP-8
15V, 300mA Synchronous Step-Down DC/DC Converter
with Ultralow Quiescent Current
V : 2.5V to 15V, V
= 0.6V, I = 1.8ꢀA, I = 1ꢀA,
Q SD
IN
OUT(MIN)
3 × 3 DFN-10, MSOP-10E
15V, 300mA Synchronous Step-Down DC/DC Converter
with Ultralow Quiescent Current and 10mA LDO
V : 2.5V to 15V, V
= 0.6V, I = 2.6ꢀA, I = 1ꢀA,
Q SD
IN
OUT(MIN)
4 × 3 DFN-14, MSOP-16E
40V, 350mA, 2.2MHz High Efficiency Micropower Step-Down V : 4.2V to 40V, V
= 1.21V, I = 2.5ꢀA, I < 1ꢀA,
Q SD
IN
OUT(MIN)
DC/DC Converter with I = 2.5ꢀA
3 × 2 DFN-10, MSOP-10
Q
LT3990
62V, 350mA, 2.2MHz High Efficiency Micropower Step-Down V : 4.2V to 62V, V
= 1.21V, I = 2.5ꢀA, I < 1ꢀA,
Q SD
IN
OUT(MIN)
DC/DC Converter with I = 2.5ꢀA
3 × 3 DFN-10, MSOP-16E
V : 4.3V to 38V, V = 1.19V, I = 2.8ꢀA, I < 1ꢀA,
OUT(MIN) Q SD
Q
LT3971
38V, 1.2A, 2.2MHz High Efficiency Micropower Step-Down
IN
DC/DC Converter with I = 2.8ꢀA
3 × 3 DFN-10, MSOP-10E
V : 4.3V to 55V, V = 1.19V, I = 2.8ꢀA, I < 1ꢀA,
OUT(MIN) Q SD
Q
LT3991
55V, 1.2A, 2.2MHz High Efficiency Micropower Step-Down
DC/DC Converter with I = 2.8ꢀA
IN
3 × 3 DFN-10, MSOP-10E
Q
LT3682
36V, 60V
, 1A, 2.2MHz High Efficiency Micropower
V : 3.6V to 36V, V
= 0.8V, I = 75ꢀA, I < 1ꢀA,
OUT(MIN) Q SD
MAX
IN
Step-Down DC/DC Converter
3 × 3 DFN-12
LTC3891
Low I , 60V Synchronous Step-Down Controller
V : 4V to 60V, V
= 0.8V, I = 50ꢀA, I = 14ꢀA,
Q
IN
OUT(MIN) Q SD
3 × 4 QFN-20, TSSOP-20E
3630fb
LT 0612 REV B • PRINTED IN USA
LinearTechnology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
26
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Linear Systems [ Linear Systems ]
