LTC3728 Linear Technology, LTC3728 Datasheet - Page 32

• Manufacturer Part Number: LTC3728
• Description: 2-Phase Synchronous Step-Down Switching Regulator
• Manufacturer: Linear Technology

LTC3728
RELATED PARTS
PART NUMBER
LTC1530
LTC1628/LTC1628-PG/ 2-Phase, Dual Output Synchronous Step-Down
LTC1628-SYNC
LTC1629/
LTC1629-PG
LTC1702
LTC1703
LTC1708-PG
LT1709/
LT1709-8
LTC1735
LTC1736
LTC1778
LTC1929/
LTC1929-PG
LTC3711
LTC3729
No R
32
TYPICAL APPLICATIO
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
[phone]
OPEN
90°
90°
DESCRIPTION
High Power Step-Down Synchronous DC/DC Controller
in SO-8
DC/DC Controller
20A to 200A PolyPhase
No R
Controller
No R
Controller with 5-Bit Mobile VID Control
2-Phase, Dual Synchronous Controller with Mobile VID
High Efficiency, 2-Phase Synchronous Step-Down
Switching Regulators with 5-Bit VID
High Efficiency Synchronous Step-Down
Switching Regulator
High Efficiency Synchronous Controller with 5-Bit Mobile Output Fault Protection, 24-Pin SSOP,
VID Control
No R
Controller
2-Phase Synchronous Controllers
No R
Controller with Digital 5-Bit Interface
20A to 200A, 550kHz PolyPhase Synchronous Controller Expandable from 2-Phase to 12-Phase, Uses all Surface Mount
●
PHASMD
CLKOUT
PLLIN
FAX: [phone]
SENSE
SENSE
SENSE
SENSE
LTC3729
LTC3728
U1
U2
2-Phase Dual Synchronous Step-Down
2-Phase Dual Synchronous Step-Down
Current Mode Synchronous Step-Down
Current Mode Synchronous Step-Down
TG1
TG2
TG1
TG2
0°
180°
90°
270°
U
TM
●
Figure 14. Multioutput PolyPhase Application
Synchronous Controllers
www.linear.com
I
I
I
I
1
2
3
4
BUCK: 2.5V/15A
BUCK: 2.5V/15A
BUCK: 1.5V/15A
BUCK: 1.8V/15A
I
IN
2.5V
1.5V
1.8V
3728 F14
O
O
O
/30A
/15A
/15A
COMMENTS
High Efficiency 5V to 3.3V Conversion at Up to 15A
Reduces C
Expandable from 2-Phase to 12-Phase, Uses All
Surface Mount Components, No Heat Sink, V
550kHz, No Sense Resistor
Mobile Pentium
V
3.5V ≤ V
1.3V ≤ V
Accurate Current Sharing, 3.5V ≤ V
Output Fault Protection, 16-Pin SSOP
3.5V ≤ V
I
Up to 42A, Uses All Surface Mount Components,
No Heat Sinks, 3.5V ≤ V
Up to 97% Efficiency, Ideal for Pentium III Processors,
0.925V ≤ V
Components, V
Up to 97% Efficiency, 4V ≤ V
3.5V ≤ V
OUT
IN
C
IN
≤ 7V
up to 20A
12V
IN
OUT
IN
IN
IN
IN
≤ 36V, VID Sets V
≤ 36V
OUT
≤ 36V, I
≤ 3.5V, Current Mode Ensures
and C
*INPUT RIPPLE CURRENT CANCELLATION
INCREASES THE RIPPLE FREQUENCY AND
REDUCES THE RMS INPUT RIPPLE CURRENT
THUS, SAVING INPUT CAPACITORS
≤ 2V, 4V ≤ V
IN
®
I
III Processors, 550kHz,
up to 36V
IN
OUT
I
I
I
I
*
1
2
3
4
OUT
, Power Good Output Signal, Synchronizable,
up to 20A, 0.8V ≤ V
IN
≤ 36V
IN
OUT1
IN
≤ 36V, I
≤ 36V, 0.8V ≤ V
© LINEAR TECHNOLOGY CORPORATION 2006
, PGOOD
IN
≤ 36V
www.DataSheet4U.com
OUT
LT 0406 REV B • PRINTED IN USA
up to 20A
OUT
IN
up to 36V
OUT
≤ 5V
≤ (0.9)(V
IN
),
3728fb