Datasheet

LT8612
22
8612fa
For more information www.linear.com/LT8612
 LINEAR TECHNOLOGY CORPORATION 2013
LT 0917 REV A • PRINTED IN USA
www.linear.com/LT8612
RELATED PARTS
TYPICAL APPLICATION
3.3V and 1.8V with Ratio Tracking Ultralow I
Q
2.5V, 3.3V Step-Down with LDO
PART NUMBER DESCRIPTION COMMENTS
LT8611 42V, 2.5A, 96% Efficiency, 2.2MHz Synchronous Micropower Step-Down
DC/DC Converter with I
Q
= 2.5µA and Input/Output Current Limit/Monitor
V
IN
: 3.4V to 42V, V
OUT(MIN)
= 0.97V, I
Q
= 2.5µA,
I
SD
< 1µA, 3mm × 5mm QFN-24 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 T
ransient 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
BSTV
IN
EN/UV
SYNC
PG
INTV
CC
TR/SS
RT
SW
LT8612
GND
PGND
BIAS
FB
0.1µF
V
OUT1
3.3V
6A
4.7µF
V
IN
3.9V TO 42V
1µF
10nF
4.7pF
5.6µH
232k
97.6k
f
SW
= 500kHz
88.7k
BSTV
IN
EN/UV
SYNC
PG
INTV
CC
TR/SS
RT
SW
LT8612
GND
PGND
BIAS
8612 TA08
FB
0.1µF
V
OUT2
1.8V
6A
4.7µF
1µF
4.7pF
3.3µH
80.6k
24.3k
93.1k
f
SW
= 500kHz
88.7k
10k
47µF×2
1210
47µF×2
1210
BSTV
IN
EN/UV
SYNC
PG
INTV
CC
TR/SS
RT
SW
LT8612
GND
PGND
BIAS
8612 TA10
FB
0.1µF
V
OUT1
3.3V
6A
4.7µF
V
IN
3.9V TO 27V
1µF
10nF
4.7pF
1.8µH
1M
412k
2.2µF
V
OUT2
2.5V
20mA
f
SW
= 2MHz
18.2k
47µF×2
1210
IN
LT3008-2.5
SHDN
OUT
SENSE
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