LTC3646-1_15 Datasheet, PDF (28/28 Pages) Linear Technology – 40V, 1A Synchronous Step-Down Converter

LTC3646/LTC3646-1
TYPICAL APPLICATION
28V Output at 500kHz Operating Frequency
D1: DFLS 1200
V_IN
40V
2Ω
PVIN
SVIN
RUN
BOOST
LTC3646
100k
22µF
INTV_CC
SW
PGOOD
ITH
2.2µF
4.7µF
R_COMP
402k
180k
C_COMP
220pF
RT
SWITCH ^VON
MODE/SYNC ^CONTROL
EXTV_CC
0.6V
+ – _VFB
SGND
PGND
L1: WÜRTH WE-TPC-744-066-470
0.1µF
L1
47µH
V_OUT
28V
C_OUT
33µF
487k
10.7k
3646 TA04a
100
90
80
70
60
50
40
30
20
10
0
0.001
Efficiency
Burst Mode OPERATION
FORCED CONTINUOUS
0.01
0.1
1
LOAD CURRENT (A)
3646 TA04b
RELATED PARTS
PART
NUMBER DESCRIPTION
COMMENTS
LTC3642
LTC3631
LTC3632
LTC3601
LTC3603
LT3991
LT3682
LT3689
45V Input Capable with 60V Transient Protection, 50mA, Synchronous V_IN(MIN) = 4.5V, V_IN(MAX) = 45V, 60V Transient, V_OUT(MIN) = 0.8V,
Micropower Step-Down DC/DC Converter with I_Q = 12µA
I_Q = 12µA, I_SD < 1µA, 3mm × 3mm DFN-8, MSOP-8E Packages
45V Input Capable with 60V Transient Protection, 100mA, Synchronous V_IN(MIN) = 4.5V, V_IN(MAX) = 45V, 60V Transient, V_OUT(MIN) = 0.8V,
Micropower Step-Down DC/DC Converter with I_Q = 12µA
I_Q = 12µA, I_SD <1µA, 3mm × 3mm DFN-8, MSOP-8E Packages
50V Input Capable with 60V Transient Protection, 20mA, Synchronous V_IN(MIN) = 4.5V, V_IN(MAX) = 45V, 60V Transient, V_OUT(MIN) = 0.8V,
Micropower Step-Down DC/DC Converter with I_Q = 12µA
I_Q = 12µA, I_SD <1µA, 3mm × 3mm DFN-8, MSOP-8E Packages
15V, 1.5A (I_OUT), 4MHz, Synchronous Step-Down DC/DC Converter
V_IN(MIN) = 4.5V, V_IN(MAX) = 15V, V_OUT(MIN) = 0.6V, I_Q = 300µA,
I_SD <1µA, 4mm × 4mm QFN-20, MSOP-16E Packages
15V, 2.5A (I_OUT), 3MHz, Synchronous Step-Down DC/DC Converter
V_IN(MIN) = 4.5V, V_IN(MAX) = 15V, V_OUT(MIN) = 0.6V, I_Q = 75µA,
I_SD <1µA, 4mm × 4mm QFN-20, MSOP-16E Packages
55V, 1.2A, 2.2MHz High Efficiency Micropower Step-Down DC/DC
Converter with I_Q = 2.8µA
V_IN(MIN) = 4.3V, V_IN(MAX) = 38V, V_OUT(MIN) = 1.2V, I_Q = 2.8µA,
I_SD <1µA, 3mm × 3mm DFN-10, MSOP-10E Packages
36V, 60V_MAX, 1A, 2.2MHz High Efficiency Micropower Step-Down
DC/DC Converter
V_IN(MIN) = 3.6V, V_IN(MAX) = 36V, V_OUT(MIN) = 0.8V, I_Q = 75µA,
I_SD <1µA, 3mm × 3mm DFN-12 Package
36V, 60V Transient Protection, 800mA, 2.2MHz High Efficiency
Micropower Step-Down DC/DC Converter with POR Reset and
Watchdog Timer
V_IN(MIN) = 3.6V, V_IN(MAX) = 36V, Transient to 60V, V_OUT(MIN) = 0.8V,
I_Q = 75µA, I_SD <1µA, 3mm × 3mm QFN-16 Package
LT3480
LT3980
LT8610/
LT8611
36V with Transient Protection to 60V, 2A (I_OUT), 2.4MHz, High
Efficiency Step-Down DC/DC Converter with Burst Mode Operation
58V with Transient Protection to 80V, 2A (I_OUT), 2.4MHz, High
Efficiency Step-Down DC/DC Converter with Burst Mode Operation
42V, 2.5A, 96% Efficiency, 2.2MHz Synchronous Micropower
Step-Down DC/DC Converter with I_Q = 2.5µA
V_IN(MIN) = 3.6V, V_IN(MAX) = 36V, Transient to 60V, V_OUT(MIN) = 0.78V,
I_Q = 70µA, I_SD <1µA, 3mm × 3mm DFN-10, MSOP-10E Packages
V_IN(MIN) = 3.6V, V_IN(MAX) = 58V, Transient to 80V, V_OUT(MIN) = 0.78V,
I_Q = 85µA, I_SD <1µA, 3mm × 4mm DFN-16, MSOP-16E Packages
V_IN = 3.4V to 42V, V_OUT(MIN) = 0.97V, I_Q = 2.5µA, I_SD <1µA,
MSOP-16E Package
28 Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 950_Fo3_r5_m-7_o4_re1_i7_{nformation www.linear.com/LTC3646}
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36461fb
LT 0314 REV B • PRINTED IN USA
 LINEAR TECHNOLOGY CORPORATION 2012