LTC3828 Datasheet, PDF (32/32 Pages) Linear Technology – Dual 2-Phase Step-Down Controller with Tracking

LTC3828
TYPICAL APPLICATIO
OPEN
0°
PHASMD TG1
180°
U1 ^TG2
LTC3729
90°
CLKOUT
90°
TG1
270°
U2 ^TG2
LTC3828
90°
PLLIN
I_IN
I₁
BUCK: 2.5V/15A
BUCK: 2.5V/15A
I₂
I₃
BUCK: 1.5V/15A
BUCK: 1.8V/15A
I₄
12V_IN
C_IN
I_IN*
2.5V_O/30A
I₁
I₂
1.5V_O/15A
1.8V_O/15A
3828 F16
I₃
I₄
*INPUT RIPPLE CURRENT CANCELLATION
INCREASES THE RIPPLE FREQUENCY AND
REDUCES THE RMS INPUT RIPPLE CURRENT
THUS, SAVING INPUT CAPACITORS
Figure 16. Multioutput PolyPhase Application
RELATED PARTS
PART NUMBER
DESCRIPTION
COMMENTS
LTC1628/LTC1628-PG/
LTC1628-SYNC
LTC1629/
LTC1629-PG
LTC1702A
2-Phase, Dual Output Synchronous Step-Down
DC/DC Controller
20A to 200A PolyPhase^TM Synchronous Controllers
No R_SENSE 2-Phase Dual Synchronous Step-Down
Controller
Reduces C_IN and C_OUT, Power Good Output Signal, Synchronizable,
3.5V ≤ V_IN ≤ 36V, I_OUT up to 20A, 0.8V ≤ V_OUT ≤ 5V
Expandable from 2-Phase to 12-Phase, Uses All
Surface Mount Components, No Heat Sink, V_IN up to 36V
550kHz, No Sense Resistor
LTC1708-PG
LT1709/
LT1709-8
LTC1735
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
3.5V ≤ V_IN ≤ 36V, VID Sets V_OUT1, PGOOD
1.3V ≤ V_OUT ≤ 3.5V, Current Mode Ensures
Accurate Current Sharing, 3.5V ≤ V_IN ≤ 36V
Output Fault Protection, 16-Pin SSOP
LTC1778/LTC1778-1
LTC1929/
LTC1929-PG
LTC3708
LTC3711
LTC3728
No R_SENSE Current Mode Synchronous Step-Down
Controllers
2-Phase Synchronous Controllers
Dual, 2-Phase, DC/DC Controller with Output Tracking
No R_SENSE Current Mode Synchronous Step-Down
Controller with Digital 5-Bit Interface
Dual, 550kHz, 2-Phase Synchronous Step-Down
Controller
Up to 97% Efficiency, 4V ≤ V_IN ≤ 36V, 0.8V ≤ V_OUT ≤ (0.9)(V_IN),
I_OUT up to 20A
Up to 42A, Uses All Surface Mount Components,
No Heat Sinks, 3.5V ≤ V_IN ≤ 36V
Current Mode, No R_SENSE, Up/Down Tracking, Synchronizable
Up to 97% Efficiency, Ideal for Pentium^® III Processors,
0.925V ≤ V_OUT ≤ 2V, 4V ≤ V_IN ≤ 36V, I_OUT up to 20A
Dual 180° Phased Controllers, V_IN 3.5V to 35V, 99% Duty Cycle,
5x5QFN, SSOP-28
LTC3729
LTC3731
LTC3770
20A to 200A, 550kHz PolyPhase Synchronous Controller
3- to 12-Phase Step-Down Synchronous Controller
Fast, No R_SENSE Step-Down Synchronous Controller
with Margining, Tracking, PLL
Expandable from 2-Phase to 12-Phase, Uses all Surface Mount
Components, V_IN up to 36V
60A to 240A Output Current, 0.6V ≤ V_OUT ≤ 6V, 4.5V ≤ V_IN ≤ 32V
± 0.67% 0.6V Reference Voltage; Programmable Margining; True
Current Mode; 4V ≤ V_IN ≤ 32V
No R_SENSE and PolyPhase are trademarks of Linear Technology Corporation. Pentium is a registered trademark of Intel Corporation.
32 Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
[phone] ^● FAX: [phone] ^● www.linear.com
3828f
LT/TP 0405 500 • PRINTED IN USA
© LINEAR TECHNOLOGY CORPORATION 2005