Datasheet

LTC3646/LTC3646-1
28
36461fa
For more information www.linear.com/LTC3646
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
[phone]
●
FAX: [phone]
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www.linear.com
 LINEAR TECHNOLOGY CORPORATION 2012
LT 0713 REV A • PRINTED IN USA
relaTeD parTs
Typical applicaTion
PART
NUMBER DESCRIPTION COMMENTS
LTC3642 45V Input Capable with 60V Transient Protection, 50mA, Synchronous
Micropower Step-Down DC/DC Converter with I
Q
= 12µA
V
IN(MIN)
= 4.5V, V
IN(MAX)
= 45V, 60V Transient, V
OUT(MIN)
= 0.8V,
I
Q
= 12µA, I
SD
< 1µA, 3mm × 3mm DFN-8, MSOP-8E Packages
LTC3631 45V Input Capable with 60V Transient Protection, 100mA, Synchronous
Micropower Step-Down DC/DC Converter with I
Q
= 12µA
V
IN(MIN)
= 4.5V, V
IN(MAX)
= 45V, 60V Transient, V
OUT(MIN)
= 0.8V,
I
Q
= 12µA, I
SD
<1µA, 3mm × 3mm DFN-8, MSOP-8E Packages
LTC3632 50V Input Capable with 60V Transient Protection, 20mA, Synchronous
Micropower Step-Down DC/DC Converter with I
Q
= 12µA
V
IN(MIN)
= 4.5V, V
IN(MAX)
= 45V, 60V Transient, V
OUT(MIN)
= 0.8V,
I
Q
= 12µA, I
SD
<1µA, 3mm × 3mm DFN-8, MSOP-8E Packages
LTC3601 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
LTC3603 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
LT3991 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
LT3682 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
LT3689 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 36V with Transient Protection to 60V, 2A (I
OUT
), 2.4MHz, High
Efficiency Step-Down DC/DC Converter with Burst Mode Operation
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
LT3980 58V with Transient Protection to 80V, 2A (I
OUT
), 2.4MHz, High
Efficiency Step-Down DC/DC Converter with Burst Mode Operation
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
LT8610/
LT8611
42V, 2.5A, 96% Efficiency, 2.2MHz Synchronous Micropower
Step-Down DC/DC Converter with I
Q
= 2.5µA
V
IN
= 3.4V to 42V, V
OUT(MIN)
= 0.97V, I
Q
= 2.5µA, I
SD
<1µA,
MSOP-16E Package
Efficiency
LOAD CURRENT (A)
0.001
EFFICIENCY (%)
0.1 1
3646 TA04b
0
0.01
100
10
20
30
40
50
60
70
80
90
Burst Mode OPERATION
FORCED CONTINUOUS
PVIN
SVIN
RUN
INTV
CC
PGOOD
ITH
RT
MODE/SYNC
EXTV
CC
BOOST
SW
V
ON
V
FB
+
–
SWITCH
CONTROL
LTC3646
100k
2Ω
L1
47µH
SGND PGND
0.1µF
487k
22µF
0.6V
180k
R
COMP
402k
10.7k
3646 TA04a
C
OUT
33µF
V
OUT
28V
4.7µF
C
COMP
220pF
V
IN
40V
2.2µF
L1: WÜRTH WE-TPC-744-066-470
D1: DFLS 1200