ltc3728legn-1-tr Linear Technology Corporation, ltc3728legn-1-tr Datasheet - Page 32

• Manufacturer Part Number: ltc3728legn-1-tr
• Description: Dual, 550khz, 2-phase Synchronous Regulator
• Manufacturer: Linear Technology Corporation

LTC3728L-1
TYPICAL APPLICATION
RELATED PARTS
PART NUMBER
LTC1628/LTC1628-PG/
LTC1628-SYNC
LTC1629/
LTC1629-PG
LTC1708-PG
LT1709/
LT1709-8
LTC1735
LTC1736
LTC1778/LTC1778-1
LTC1929/
LTC1929-PG
LTC3708
LTC3711
LTC3728
LTC3729
LTC3731
LTC3802
No R
32
SENSE
and PolyPhase are trademarks of Linear Technology Corporation.
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
[phone]
OPEN
90°
90°
DESCRIPTION
2-Phase, Dual Output Synchronous Step-Down
DC/DC Controller
20A to 200A PolyPhase™ Synchronous Controllers
2-Phase, Dual Synchronous Controller with Mobile VID
High Effi ciency, 2-Phase Synchronous Step-Down
Switching Regulators with 5-Bit VID
High Effi ciency Synchronous Step-Down
Switching Regulator
High Effi ciency Synchronous Controller with 5-Bit Mobile
VID Control
No R
Controllers
2-Phase Synchronous Controllers
Dual, 2-Phase, DC/DC Controller with Output Tracking
No R
Controller with Digital 5-Bit Interface
Dual, 550kHz, 2-Phase Synchronous Step-Down
Controller
20A to 200A, 550kHz PolyPhase Synchronous Controller Expandable from 2-Phase to 12-Phase, Uses all Surface Mount
3- to 12-Phase Step-Down Synchronous Controller
No R
Controller
●
PHASMD
CLKOUT
PLLIN
FAX: [phone]
SENSE
SENSE
SENSE
LTC3728L-1
LTC3729
U1
U2
Current Mode Synchronous Step-Down
Current Mode Synchronous Step-Down
2-Phase Dual Synchronous Step-Down
TG1
TG2
TG1
TG2
0°
180°
90°
270°
●
Figure 14. Multioutput PolyPhase Application
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
3728L1 F14
O
O
O
/30A
/15A
/15A
COMMENTS
Reduces C
3.5V ≤ V
Expandable from 2-Phase to 12-Phase, Uses All
Surface Mount Components, No Heat Sink, V
3.5V ≤ V
1.3V ≤ V
Accurate Current Sharing, 3.5V ≤ V
Output Fault Protection, 16-Pin SSOP
Output Fault Protection, 24-Pin SSOP ,
3.5V ≤ V
Up to 97% Effi ciency, 4V ≤ V
I
Up to 42A, Uses All Surface Mount Components,
No Heat Sinks, 3.5V ≤ V
Current Mode, No R
Up to 97% Effi ciency, Ideal for Pentium
0.925V ≤ V
Dual 180° Phased Controllers, V
5x5QFN, SSOP-28
Components, V
60A to 240A Output Current, 0.6V ≤ V
330kHz to 750kHz, No Sense Resistor, Output Voltage Tracking,
Synchronizable for 4-Phase Operation
OUT
C
IN
up to 20A
12V
IN
IN
OUT
IN
IN
IN
≤ 36V, I
≤ 36V, VID Sets V
≤ 36V
OUT
≤ 3.5V, Current Mode Ensures
and C
*INPUT RIPPLE CURRENT CANCELLATION
≤ 2V, 4V ≤ V
INCREASES THE RIPPLE FREQUENCY AND
REDUCES THE RMS INPUT RIPPLE CURRENT
THUS, SAVING INPUT CAPACITORS
IN
I
up to 36V
IN
OUT
OUT
I
I
I
I
*
1
2
3
4
SENSE
, Power Good Output Signal, Synchronizable,
up to 20A, 0.8V ≤ V
IN
, Up/Down Tracking, Synchronizable
≤ 36V
IN
OUT1
IN
≤ 36V, I
≤ 36V, 0.8V ≤ V
IN
© LINEAR TECHNOLOGY CORPORATION 2005
, PGOOD
3.5V to 35V, 99% Duty Cycle,
IN
OUT
≤ 36V
OUT
®
III Processors,
up to 20A
≤ 6V, 4.5V ≤ V
OUT
LT 0708 REV C • PRINTED IN USA
IN
≤ 5V
OUT
up to 36V
≤ (0.9)(V
IN
≤ 32V
IN
),
3728l1fc