LT3645 查看數據表（PDF） - Linear Technology
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LT3645 Datasheet PDF : 24 Pages
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LT3645
TYPICAL APPLICATION
1.8V Step-Down Converter with 0.8V Logic Rail
12V
ON OFF
BOOST
VIN
SW
1μF
LT3645
DA
EN/UVLO
FB
0.1μF
4.7μH
MBRM140
12.4k
10μF
10k
1.8V
500mA
PGOOD
EN2
NPG
VCC2
OUT2
FB2
GND
2.2μF
3645 TA07
0.8V
200mA
+
0.1μF V 3V
–
ALTERNATE
POWER SOURCE
RELATED PARTS
PART NUMBER DESCRIPTION
COMMENTS
LT3694
36V, 70V Transient Protection, 2.6A, 2.5MHz
High Efficiency Step-Down DC/DC Converter
with Dual LDO Controllers
VIN: 3.6V to 36V, Transient to 70V, VOUT(MIN) = 0.75V, IQ = 1mA, ISD < 1μA,
4mm × 5mm QFN-28, TSSOP-20E
LT3509
36V, 60V Transient Protection, Dual 700mA,
2.2MHz High Efficiency Step-Down DC/DC
Converter
VIN: 3.6V to 36V, Transient to 60V, VOUT(MIN) = 0.8V, IQ = 1.9mA, ISD < 1μA,
3mm × 4mm DFN-14, MSOP-16E
LT3689
36V, 60V Transient Protection, 800mA, 2.2MHz VIN: 3.6V to 36V, Transient to 60V, VOUT(MIN) = 0.8V, IQ = 75μA, ISD < 1μA,
High Efficiency MicroPower Step-Down DC/DC 3mm × 3mm QFN-16
Converter with POR Reset and Watchdog Timer
LT3682
36V, 60VMax, 1A, 2.2MHz High Efficiency
Micropower Step-Down DC/DC Converter
VIN: 3.6V to 36V, Transient to 60V, VOUT(MIN) = 0.8V, IQ = 75μA, ISD < 1μA,
3mm × 3mm QFN-12
LT3970
40V, 350mA (IOUT), 2.2MHz, High Efficiency
VIN: 4.2V to 40V, VOUT(MIN) = 1.21V, IQ = 2.5μA, ISD < 1μA, 3mm × 3mm DFN-10,
Step-Down DC/DC Converter with Only 2.5μA of MSOP-10
Quiescent Current
LT3990
62V, 350mA (IOUT), 2.2MHz, High Efficiency
VIN: 4.2V to 40V, VOUT(MIN) = 1.21V, IQ = 2.5μA, ISD < 1μA, 3mm × 3mm DFN-10,
Step-Down DC/DC Converter with Only 2.5μA of MSOP-10
Quiescent Current
LT3791
LT3991
LT3480
38V, 1.2A, 2.2MHz High Efficiency MicroPower
Step-Down DC/DC Converter with IQ = 2.8μA
55V, 1.2A, 2.2MHz High Efficiency MicroPower
Step-Down DC/DC Converter with IQ = 2.8μA
36V with Transient Protection to 60V, 2A (IOUT),
2.4MHz, High Efficiency Step-Down DC/DC
Converter with Burst Mode® Operation
VIN: 4.3V to 38V, VOUT(MIN) = 1.2V, IQ = 2.8mA, ISD < 1μA, 3mm × 3mm DFN-10,
MSOP-10E
VIN: 4.3V to 55V, VOUT(MIN) = 1.2V, IQ = 2.8mA, ISD < 1μA, 3mm × 3mm DFN-10,
MSOP-10E
VIN: 3.6V to 38V, VOUT(MIN) = 0.78V, IQ = 70μA, ISD < 1μA, 3mm × 3mm DFN-10,
MSOP-10E
LT3685
36V with Transient Protection to 60V, 2A (IOUT), VIN: 3.6V to 38V, VOUT(MIN) = 0.78V, IQ = 70μA, ISD < 1μA, 3mm × 3mm DFN-10,
2.4MHz, High Efficiency Step-Down DC/DC
MSOP-10E
Converter
24 Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900 ● FAX: (408) 434-0507 ● www.linear.com
3645f
LT 0511 • PRINTED IN USA
© LINEAR TECHNOLOGY CORPORATION 2011
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