Datasheet

32
LTC3728
3728fc
PART NUMBER DESCRIPTION COMMENTS
LTC1530 High Power Step-Down Synchronous DC/DC Controller High Efficiency 5V to 3.3V Conversion at Up to 15A
in SO-8
LTC1628/LTC1628-PG/ 2-Phase, Dual Output Synchronous Step-Down Reduces C
IN
and C
OUT
, Power Good Output Signal, Synchronizable,
LTC1628-SYNC DC/DC Controller 3.5V V
IN
36V, I
OUT
up to 20A, 0.8V V
OUT
5V
LTC1629/ 20A to 200A PolyPhase
TM
Synchronous Controllers Expandable from 2-Phase to 12-Phase, Uses All
LTC1629-PG Surface Mount Components, No Heat Sink, V
IN
up to 36V
LTC1702 No R
SENSE
2-Phase Dual Synchronous Step-Down 550kHz, No Sense Resistor
Controller
LTC1703 No R
SENSE
2-Phase Dual Synchronous Step-Down Mobile Pentium
®
III Processors, 550kHz,
Controller with 5-Bit Mobile VID Control V
IN
7V
LTC1708-PG 2-Phase, Dual Synchronous Controller with Mobile VID 3.5V V
IN
36V, VID Sets V
OUT1
, PGOOD
LT1709/ High Efficiency, 2-Phase Synchronous Step-Down 1.3V V
OUT
3.5V, Current Mode Ensures
LT1709-8 Switching Regulators with 5-Bit VID Accurate Current Sharing, 3.5V V
IN
36V
LTC1735 High Efficiency Synchronous Step-Down Output Fault Protection, 16-Pin SSOP
Switching Regulator
LTC1736 High Efficiency Synchronous Controller with 5-Bit Mobile Output Fault Protection, 24-Pin SSOP,
VID Control 3.5V V
IN
36V
LTC1778 No R
SENSE
Current Mode Synchronous Step-Down Up to 97% Efficiency, 4V V
IN
36V, 0.8V V
OUT
(0.9)(V
IN
),
Controller I
OUT
up to 20A
LTC1929/ 2-Phase Synchronous Controllers Up to 42A, Uses All Surface Mount Components,
LTC1929-PG No Heat Sinks, 3.5V V
IN
36V
LTC3711 No R
SENSE
Current Mode Synchronous Step-Down Up to 97% Efficiency, Ideal for Pentium III Processors,
Controller with Digital 5-Bit Interface 0.925V V
OUT
2V, 4V V
IN
36V, I
OUT
up to 20A
LTC3729 20A to 200A, 550kHz PolyPhase Synchronous Controller Expandable from 2-Phase to 12-Phase, Uses all Surface Mount
Components, V
IN
up to 36V
No R
SENSE
and PolyPhase are trademarks of Linear Technology Corporation. Pentium is a registered trademark of Intel Corporation.
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900
FAX: (408) 434-0507
www.linear.com
© LINEAR TECHNOLOGY CORPORATION 2006
LT 0406 REV C • PRINTED IN USA
RELATED PARTS
U
TYPICAL APPLICATIO
Figure 14. Multioutput PolyPhase Application
PHASMD
CLKOUT
TG1
TG2
0°
I
1
I
3
I
2
I
4
90°
OPEN
180°
U1
LTC3729
BUCK: 2.5V/15A
BUCK: 2.5V/15A
PLLIN
TG1
TG2
90°
90°
270°
U2
LTC3728
BUCK: 1.5V/15A
2.5V
O
/30A
C
IN
I
IN
12V
IN
*INPUT RIPPLE CURRENT CANCELLATION
INCREASES THE RIPPLE FREQUENCY AND
REDUCES THE RMS INPUT RIPPLE CURRENT
THUS, SAVING INPUT CAPACITORS
I
IN
*
1.5V
O
/15A
1.8V
O
/15A
3728 F14
BUCK: 1.8V/15A
I
1
I
2
I
3
I
4