LT3645
24
3645f
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900
●
FAX: (408) 434-0507
●
www.linear.com
© LINEAR TECHNOLOGY CORPORATION 2011
LT 0511 • PRINTED IN USA
RELATED PARTS
TYPICAL APPLICATION
PART NUMBER DESCRIPTION COMMENTS
LT3694 36V, 70V Transient Protection, 2.6A, 2.5MHz
High Effi ciency Step-Down DC/DC Converter
with Dual LDO Controllers
V
IN
: 3.6V to 36V, Transient to 70V, V
OUT(MIN)
= 0.75V, I
Q
= 1mA, I
SD
< 1µA,
4mm × 5mm QFN-28, TSSOP-20E
LT3509 36V, 60V Transient Protection, Dual 700mA,
2.2MHz High Effi ciency Step-Down DC/DC
Converter
V
IN
: 3.6V to 36V, Transient to 60V, V
OUT(MIN)
= 0.8V, I
Q
= 1.9mA, I
SD
< 1µA,
3mm × 4mm DFN-14, MSOP-16E
LT3689 36V, 60V Transient Protection, 800mA, 2.2MHz
High Effi ciency MicroPower Step-Down DC/DC
Converter with POR Reset and Watchdog Timer
V
IN
: 3.6V to 36V, Transient to 60V, V
OUT(MIN)
= 0.8V, I
Q
= 75µA, I
SD
< 1µA,
3mm × 3mm QFN-16
LT3682 36V, 60VMax, 1A, 2.2MHz High Effi ciency
Micropower Step-Down DC/DC Converter
V
IN
: 3.6V to 36V, Transient to 60V, V
OUT(MIN)
= 0.8V, I
Q
= 75µA, I
SD
< 1µA,
3mm × 3mm QFN-12
LT3970 40V, 350mA (I
OUT
), 2.2MHz, High Effi ciency
Step-Down DC/DC Converter with Only 2.5µA of
Quiescent Current
V
IN
: 4.2V to 40V, V
OUT(MIN)
= 1.21V, I
Q
= 2.5µA, I
SD
< 1µA, 3mm × 3mm DFN-10,
MSOP-10
LT3990 62V, 350mA (I
OUT
), 2.2MHz, High Effi ciency
Step-Down DC/DC Converter with Only 2.5µA of
Quiescent Current
V
IN
: 4.2V to 40V, V
OUT(MIN)
= 1.21V, I
Q
= 2.5µA, I
SD
< 1µA, 3mm × 3mm DFN-10,
MSOP-10
LT3791 38V, 1.2A, 2.2MHz High Effi ciency MicroPower
Step-Down DC/DC Converter with I
Q
= 2.8µA
V
IN
: 4.3V to 38V, V
OUT(MIN)
= 1.2V, I
Q
= 2.8mA, I
SD
< 1µA, 3mm × 3mm DFN-10,
MSOP-10E
LT3991 55V, 1.2A, 2.2MHz High Effi ciency MicroPower
Step-Down DC/DC Converter with I
Q
= 2.8µA
V
IN
: 4.3V to 55V, V
OUT(MIN)
= 1.2V, I
Q
= 2.8mA, I
SD
< 1µA, 3mm × 3mm DFN-10,
MSOP-10E
LT3480 36V with Transient Protection to 60V, 2A (I
OUT
),
2.4MHz, High Effi ciency Step-Down DC/DC
Converter with Burst Mode
®
Operation
V
IN
: 3.6V to 38V, V
OUT(MIN)
= 0.78V, I
Q
= 70µA, I
SD
< 1µA, 3mm × 3mm DFN-10,
MSOP-10E
LT3685 36V with Transient Protection to 60V, 2A (I
OUT
),
2.4MHz, High Effi ciency Step-Down DC/DC
Converter
V
IN
: 3.6V to 38V, V
OUT(MIN)
= 0.78V, I
Q
= 70µA, I
SD
< 1µA, 3mm × 3mm DFN-10,
MSOP-10E
1.8V Step-Down Converter with 0.8V Logic Rail
1µF
3645 TA07
PGOOD
12V
GND
SW
DA
FB
FB2
EN2
V
CC2
V
IN
EN/UVLO
NPG
OUT2
10µF
1.8V
500mA
0.8V
200mA
ALTERNATE
POWER SOURCE
3V
4.7µH
MBRM140
12.4k
10k
BOOST
LT3645
2.2µF
0.1µF
+
–
V
ON OFF
0.1µF
