ltc3728legn-trpbf Linear Technology Corporation, ltc3728legn-trpbf Datasheet - Page 36

• Manufacturer Part Number: ltc3728legn-trpbf
• Description: Dual, 550khz, 2-phase Synchronous Step-down Switching Regulator
• Manufacturer: Linear Technology Corporation

LTC3728
TYPICAL APPLICATION
RELATED PARTS
PART NUMBER
LTC1350
LTC1628/LTC1628-PG/
LTC1628-SYNC
LTC1629/
LTC1629-PG
LTC1702
LTC1703
LTC1708-PG
LT1709/LT1709-8
LTC1735
LTC1736
LTC1778
LTC1929/LTC1929-PG 2-Phase Synchronous Controllers
LTC3711
LTC3729
No R
36
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
2-Phase, Dual Output Synchronous
Step-Down DC/DC Controller
20A to 200A PolyPhase™ Synchronous
Controllers
No R
Step-Down Controller
No R
Down Controller with 5-Bit Mobile VID Control
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
Step-Down Controller
No R
Down Controller with Digital 5-Bit Interface
20A to 200A, 550kHz PolyPhase Synchronous
Controller
●
PHASMD
CLKOUT
PLLIN
FAX: [phone]
SENSE
SENSE
SENSE
SENSE
LTC3729
LTC3728
U1
U2
2-Phase Dual Synchronous
2-Phase Dual Synchronous Step-
Current Mode Synchronous
Current Mode Synchronous Step-
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
Up to 42A, Uses All Surface Mount Components, No Heat Sinks, 3.5V ≤ V
COMMENTS
High Effi ciency 5V to 3.3V Conversion at Up to 15A
Reduces C
3.5V ≤ V
Expandable from 2-Phase to 12-Phase, Uses All Surface Mount Components,
No Heat Sink, V
550kHz, No Sense Resistor
Mobile Pentium
3.5V ≤ V
1.3V ≤ V
≤ 36V
Output Fault Protection, 16-Pin SSOP
Output Fault Protection, 24-Pin SSOP , 3.5V ≤ V
Up to 97% Effi ciency, 4V ≤ V
Up to 97% Effi ciency, Ideal for Pentium III Proccessors, 0.925V ≤ V
4V ≤ V
Expandable from 2-Phase to 12-Phase, Uses all Surface Mount Components,
V
IN
up to 36V
2.5V
1.5V
1.8V
3728 F14
IN
O
O
O
IN
IN
OUT
≤ 36V, I
/30A
/15A
/15A
IN
≤ 36V, I
≤ 36V, VID Sets V
C
≤ 3.5V, Current Mode Ensures Accurate Current Sharing, 3.5V ≤ V
and C
IN
IN
®
OUT
III Processors, 550kHz, V
12V
up to 36V
OUT
OUT
up to 20A
IN
, Power Good Output Signal, Synchronizable,
up to 20A, 0.8V ≤ V
*INPUT RIPPLE CURRENT CANCELLATION
INCREASES THE RIPPLE FREQUENCY AND
REDUCES THE RMS INPUT RIPPLE CURRENT
THUS, SAVING INPUT CAPACITORS
I
OUT1
IN
IN
I
I
I
I
*
1
2
3
4
≤ 36V, 0.8V ≤ V
, PGOOD
OUT
IN
© LINEAR TECHNOLOGY CORPORATION 2006
≤ 7V
≤ 5V
OUT
IN
≤ 36V
≤ (0.9)(V
LT 0807 REV D • PRINTED IN USA
IN
), I
OUT
OUT
up to 20A
≤ 2V,
IN
≤ 36V
3728fd
IN