LTC3728EUH#TR Linear Technology, LTC3728EUH#TR Datasheet - Page 36

• Manufacturer Part Number: LTC3728EUH#TR
• Description: IC SW REG SYNC STP-DN DUAL 32QFN
• Manufacturer: Linear Technology
• Series: PolyPhase®r
• Type: Step-Down (Buck)r

Specifications of LTC3728EUH#TR

• Internal Switch(s): No
• Synchronous Rectifier: Yes
• Number Of Outputs: 2
• Voltage - Output: 0.8 ~ 5.5 V
• Current - Output: 3A
• Frequency - Switching: 250kHz ~ 550kHz
• Voltage - Input: 3.5 ~ 36 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 32-QFN
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Power - Output: -
• Other names: LTC3728EUHTR

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
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
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
No R
Step-Down Controller
No R
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
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 Step-Down
Current Mode Synchronous
Current Mode Synchronous Step-Down
TG1
TG2
TG1
TG2
2-Phase Dual Synchronous
0°
180°
90°
270°
®
●
Synchronous Controllers Expandable from 2-Phase to 12-Phase, Uses All Surface Mount
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
COMMENTS
High Effi ciency 5V to 3.3V Conversion at Up to 15A
Reduces C
3.5V ≤ V
Components, No Heat Sink, V
550kHz, No Sense Resistor
Mobile Pentium III Processors, 550kHz, V
3.5V ≤ V
1.3V ≤ V
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
Up to 97% Effi ciency, Ideal for Pentium III Processors, 0.925V ≤ V
4V ≤ V
Expandable from 2-Phase to 12-Phase, Uses All Surface Mount
Components, V
2.5V
1.5V
1.8V
3728 F14
OUT
O
O
O
Up to 20A
is a trademark of Linear Technology Corporation.
/30A
/15A
/15A
IN
C
IN
IN
OUT
IN
IN
≤ 36V, I
IN
IN
≤ 36V, I
≤ 36V, VID Sets V
≤ 36V
≤ 36V
≤ 3.5V, Current Mode Ensures Accurate Current Sharing,
and C
12V
IN
OUT
IN
Up to 36V
OUT
OUT
Up to 20A
*INPUT RIPPLE CURRENT CANCELLATION
INCREASES THE RIPPLE FREQUENCY AND
REDUCES THE RMS INPUT RIPPLE CURRENT
THUS, SAVING INPUT CAPACITORS
, Power Good Output Signal, Synchronizable,
Up to 20A, 0.8V ≤ V
I
IN
I
I
I
I
*
1
2
3
4
OUT1
IN
IN
≤ 36V, 0.8V ≤ V
Up to 36V
, PGOOD
© LINEAR TECHNOLOGY CORPORATION 2006
IN
OUT
≤ 7V
OUT
≤ 5V
IN
≤ 36V
LT 0909 REV G • PRINTED IN USA
≤ (0.9)(V
IN
),
OUT
≤ 2V,
3728fg