Datasheet

LT3640
24
3640f
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
[phone]
●
FAX: [phone]
●
www.linear.com
 LINEAR TECHNOLOGY CORPORATION 2010
LT 0510 • PRINTED IN USA
relaTeD parTs
Typical applicaTion
2MHz 3.3V/0.8A and 0.8V/1.2A Buck Regulators
3640 TA05
SYNC
WDE
PGOOD
1nF
1nF
1.5nF
1.5nF
32.4k
V
OUT2
0.8V/1.2A
V
OUT1
3.3V/0.8A
22µF
RST1
RST2
WDO
WDI FB2
CWDT CPOR RT GND SS2 SS1
SW2
SW1EN/UVLO V
IN
SW
LT3640
BST
V
IN2
FB1
0.47µH
49.9k
16.5k
80.6k
49.9k
3.3µH
0.22µF
DA
22µF
4.7µF
V
IN
4V TO 35V
EN2
PART NUMBER DESCRIPTION COMMENTS
LT3689 36V, 60V Transient Protection, 800mA, 2.2MHz High Efficiency
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 Package
LT3686 37V, 55V
MAX
, 1.2A, 2.5MHz High Efficiency Step-Down DC/DC
Converter
V
IN
: 3.6V to 37V, Transient to 55V, V
OUT(MIN)
= 1.21V, I
Q
= 1.1mA,
I
SD
< 1µA, 3mm × 3mm DFN-10 Package
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 Package
LT3971 38V, 1.2A (I
OUT
), 2MHz, High Efficiency Step-Down DC/DC
Converter with Only 2.8µA of Quiescent Current
V
IN
: 4.2V to 38V, V
OUT(MIN)
= 1.2V, I
Q
= 2.8µA, I
SD
< 1µA, 3mm × 3mm
DFN-10, MSOP-10E Packages
LT3991 55V, 1.2A (I
OUT
), 2MHz, High Efficiency Step-Down DC/DC
Converter with Only 2.8µA of Quiescent Current
V
IN
: 4.2V to 55V, V
OUT(MIN)
= 1.2V, I
Q
= 2.8µA, I
SD
< 1µA, 3mm × 3mm
DFN-10, MSOP-10E Packages