LTC3728LXCUH#TR Linear Technology, LTC3728LXCUH#TR Datasheet - Page 36

• Manufacturer Part Number: LTC3728LXCUH#TR
• Description: IC CTRLR SW REG 2-PH SYNC 32-QFN
• Manufacturer: Linear Technology
• Series: PolyPhase®r
• Type: Step-Down (Buck)r

Specifications of LTC3728LXCUH#TR

• Internal Switch(s): No
• Synchronous Rectifier: Yes
• Number Of Outputs: 2
• Voltage - Output: 0.8 ~ 7 V
• Current - Output: 3A
• Frequency - Switching: 250kHz ~ 550kHz
• Voltage - Input: 4.5 ~ 28 V
• Operating Temperature: 0°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 32-QFN
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Power - Output: -

LTC3728L/LTC3728LX
TYPICAL APPLICATION
RELATED PARTS
PART NUMBER
LTC1628/LTC1628-PG/
LTC1628-SYNC
LTC1629/LTC1629-PG
LTC1702A
LTC1708-PG
LT1709/
LT1709-8
LTC1735
LTC1736
LTC1778/LTC1778-1
LTC1929/
LTC1929-PG
LTC3708
LTC3711
LTC3728
LTC3729
LTC3731
PolyPhase is a registered trademark of Linear Technology Corporation. No R
36
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
No R
Controller
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 Dual 180° Phased Controllers, V
20A to 200A, 550kHz PolyPhase Synchronous Controller
3- to 12-Phase Step-Down Synchronous Controller
●
PHASMD
CLKOUT
PLLIN
FAX: [phone]
LTC3728LX
SENSE
SENSE
SENSE
LTC3728L/
LTC3729
U1
U2
2-Phase Dual Synchronous Step-Down
Current Mode Synchronous Step-Down
Current Mode 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
SENSE
2.5V
1.5V
1.8V
3728 F14
O
O
O
is a trademark of Linear Technology Corporation.
/30A
/15A
/15A
C
COMMENTS
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
3.5V ≤ V
1.3V ≤ V
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 III Processors,
0.925V ≤ V
5mm × 5mm QFN, SSOP-28
Expandable from 2-Phase to 12-Phase, Uses All Surface Mount
Components, V
60A to 240A Output Current, 0.6V ≤ V
IN
OUT
12V
Up to 20A
IN
IN
IN
OUT
IN
IN
≤ 36V, I
≤ 36V, VID Sets V
≤ 36V
OUT
*INPUT RIPPLE CURRENT CANCELLATION
≤ 3.5V, Current Mode Ensures Accurate Current
INCREASES THE RIPPLE FREQUENCY AND
REDUCES THE RMS INPUT RIPPLE CURRENT
THUS, SAVING INPUT CAPACITORS
and C
I
≤ 2V, 4V ≤ V
IN
IN
I
I
I
I
*
1
2
3
4
IN
Up to 36V
OUT
OUT
≤ 36V
SENSE
, Power Good Output Signal, Synchronizable,
Up to 20A, 0.8V ≤ V
, Up/Down Tracking, Synchronizable
IN
OUT1
IN
IN
≤ 36V, I
© LINEAR TECHNOLOGY CORPORATION 2002
≤ 36V, 0.8V ≤ V
Up to 36V
IN
, PGOOD
3.5V to 35V, 99% Duty Cycle,
OUT
OUT
LT 0909 REV E • PRINTED IN USA
Up to 20A
≤ 6V, 4.5V ≤ V
OUT
OUT
≤ 5V
IN
≤ 36V
≤ (0.9)(V
IN
≤ 32V
IN
),
3728lxfe