Linear Technology LT8611, Manual

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LT8611
26
8611fa
For more information www.linear.com/LT8611
 LINEAR TECHNOLOGY CORPORATION 2012
LT 0117 REV A • PRINTED IN USA
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900
●
FAX : (408) 434-0507
●
www.linear.com/LT8611
RELATED PARTS
TYPICAL APPLICATION
Coincident Tracking Step-Downs Each with 2A Output Current Limit
PART NUMBER DESCRIPTION COMMENTS
LT8610 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
LT3690 36V with 60V Transient Protection, 4A, 92% Efficiency, 1.5MHz
Synchronous Micropower Step-Down DC/DC Converter with I
Q
= 70µA
V
IN
: 3.9V to 36V, V
OUT(MIN)
= 0.985V, I
Q
= 70µA,
I
SD
< 1µA, 4mm × 6mm QFN-26 Package
LT3971 38V, 1.2A, 2.2MHz High Efficiency Micropower Step-Down DC/DC
Converter with I
Q
= 2.8µA
V
IN
: 4.2V to 38V, V
OUT(MIN)
= 1.21V, I
Q
= 2.8µA,
I
SD
< 1µA, 3mm × 3mm DFN-10 and MSOP-10E Packages
LT3991 55V, 1.2A, 2.2MHz High Efficiency Micropower Step-Down DC/DC
Converter with I
Q
= 2.8µA
V
IN
: 4.2V to 55V, V
OUT(MIN)
= 1.21V, I
Q
= 2.8µA,
I
SD
< 1µA, 3mm
×
3mm DFN-10 and MSOP-10E Packages
LT3970 40V, 350mA, 2.2MHz High Efficiency Micropower Step-Down DC/DC
Converter with I
Q
= 2.5µA
V
IN
: 4.2V to 40V, V
OUT(MIN)
= 1.21V, I
Q
= 2.5µA,
I
SD
< 1µA, 3mm × 2mm DFN-10 and MSOP-10 Packages
LT3990 62V, 350mA, 2.2MHz High Efficiency MicroPower Step-Down DC/DC
Converter with I
Q
= 2.5µA
V
IN
: 4.2V to 62V, V
OUT(MIN)
= 1.21V, I
Q
= 2.5µA,
I
SD
< 1µA, 3mm × 3mm DFN-10 and MSOP-6E Packages
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
: 3.6V to 36V, Transient to 60V, V
OUT(MIN)
= 0.78V,
I
Q
= 70µA, I
SD
< 1µA, 3mm × 3mm DFN-10 and
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
: 3.6V to 58V, Transient to 80V, V
OUT(MIN)
= 0.78V,
I
Q
= 85µA, I
SD
< 1µA, 3mm × 4mm DFN-16 and
MSOP-16E Packages
BST V
IN
EN/UV
SYNC
IMON
ICTRL
INTV
CC
TR/SS
RT
SW
LT8611
GND
ISP
ISN
BIAS
PG
FB
0.1µF
47µF
V
IN
3.8V TO 42V
1µF
0.1µF
5.6µH
0.025Ω
88.7k
f = 500kHz
PGND
10µF ON OFF
1µF
232k
10pF
97.6k
16.5k
20k
BST V
IN
EN/UV
SYNC
IMON
ICTRL
INTV
CC
TR/SS
RT
SW
LT8611
GND
ISP
ISN
BIAS
PG
FB
8611 TA12
0.1µF
V
OUT
1.8V
2A
V
OUT
3.3V
2A
68µF
1µF
5.6µH
0.025Ω
88.7k
f = 500kHz
PGND
10µF
ON OFF
1µF
80.6k
4.7pF
93.1k