LTC3728L-1
32
3728l1fc
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900
●
FAX: (408) 434-0507
●
www.linear.com
© LINEAR TECHNOLOGY CORPORATION 2005
LT 0708 REV C • PRINTED IN USA
RELATED PARTS
TYPICAL APPLICATION
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
LTC3728L-1
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
3728L1 F14
BUCK: 1.8V/15A
I
1
I
2
I
3
I
4
PART NUMBER DESCRIPTION COMMENTS
LTC1628/LTC1628-PG/
LTC1628-SYNC
2-Phase, Dual Output Synchronous Step-Down
DC/DC Controller
Reduces C
IN
and C
OUT
, Power Good Output Signal, Synchronizable,
3.5V ≤ V
IN
≤ 36V, I
OUT
up to 20A, 0.8V ≤ V
OUT
≤ 5V
LTC1629/
LTC1629-PG
20A to 200A PolyPhase™ Synchronous Controllers Expandable from 2-Phase to 12-Phase, Uses All
Surface Mount Components, No Heat Sink, V
IN
up to 36V
LTC1708-PG 2-Phase, Dual Synchronous Controller with Mobile VID 3.5V ≤ V
IN
≤ 36V, VID Sets V
OUT1
, PGOOD
LT1709/
LT1709-8
High Effi ciency, 2-Phase Synchronous Step-Down
Switching Regulators with 5-Bit VID
1.3V ≤ V
OUT
≤ 3.5V, Current Mode Ensures
Accurate Current Sharing, 3.5V ≤ V
IN
≤ 36V
LTC1735 High Effi ciency Synchronous Step-Down
Switching Regulator
Output Fault Protection, 16-Pin SSOP
LTC1736 High Effi ciency Synchronous Controller with 5-Bit Mobile
VID Control
Output Fault Protection, 24-Pin SSOP,
3.5V ≤ V
IN
≤ 36V
LTC1778/LTC1778-1 No R
SENSE
Current Mode Synchronous Step-Down
Controllers
Up to 97% Effi ciency, 4V ≤ V
IN
≤ 36V, 0.8V ≤ V
OUT
≤ (0.9)(V
IN
),
I
OUT
up to 20A
LTC1929/
LTC1929-PG
2-Phase Synchronous Controllers Up to 42A, Uses All Surface Mount Components,
No Heat Sinks, 3.5V ≤ V
IN
≤ 36V
LTC3708 Dual, 2-Phase, DC/DC Controller with Output Tracking Current Mode, No R
SENSE
, Up/Down Tracking, Synchronizable
LTC3711 No R
SENSE
Current Mode Synchronous Step-Down
Controller with Digital 5-Bit Interface
Up to 97% Effi ciency, Ideal for Pentium
®
III Processors,
0.925V ≤ V
OUT
≤ 2V, 4V ≤ V
IN
≤ 36V, I
OUT
up to 20A
LTC3728 Dual, 550kHz, 2-Phase Synchronous Step-Down
Controller
Dual 180° Phased Controllers, V
IN
3.5V to 35V, 99% Duty Cycle,
5x5QFN, SSOP-28
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
LTC3731 3- to 12-Phase Step-Down Synchronous Controller 60A to 240A Output Current, 0.6V ≤ V
OUT
≤ 6V, 4.5V ≤ V
IN
≤ 32V
LTC3802 No R
SENSE
2-Phase Dual Synchronous Step-Down
Controller
330kHz to 750kHz, No Sense Resistor, Output Voltage Tracking,
Synchronizable for 4-Phase Operation
No R
SENSE
and PolyPhase are trademarks of Linear Technology Corporation.
