LTC3728LCGN-PBF Datasheet, PDF (38/38 Pages) Linear Technology – Dual, 550kHz, 2-Phase Synchronous Regulators

LTC3728L/LTC3728LX
Typical Application
OPEN
0°
PHASMD TG1
180°
U1 ^TG2
LTC3729
90°
CLKOUT
90°
TG1
270°
U2 TG2
LTC3728L/
90° ^LTC3728LX
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
3728 F14
I₃
I₄
*INPUT RIPPLE CURRENT CANCELLATION
INCREASES THE RIPPLE FREQUENCY AND
REDUCES THE RMS INPUT RIPPLE CURRENT
THUS, SAVING INPUT CAPACITORS
Figure 14. Multioutput PolyPhase^® Application
Related Parts
PART NUMBER
DESCRIPTION
COMMENTS
LTC3880/LTC3880-1 Dual Output PolyPhase Step-Down DC/DC Controller with
Digital Power System Management
I²C/PMBus Interface with EEPROM and 16-Bit ADC
V_IN Up to 24V, 0.5V ≤ V_OUT ≤ 5.5V, Analog Control Loop
LTC3869/LTC3869-2 Dual Output, 2-Phase Synchronous Step-Down DC/DC Controller, PLL Fixed 250kHz to 750kHz Frequency, 4V ≤ V_IN ≤ 38V,
with Accurate Current Share
0.6V ≤ V_OUT ≤ 12.5V
LTC3855
Dual Output, 2-Phase, Synchronous Step-Down DC/DC Controller PLL Fixed Frequency 250kHz to 770kHz, 4.5V ≤ V_IN ≤ 38V,
with Differential Amplifier and DCR Temperature Compensation 0.8V ≤ V_OUT ≤ 12V
LTC3838
Dual, Multiphase, Controlled On-Time, High Frequency
Synchronous Step-Down Controller with Differential Amplifier
Up to 2MHz Operating Frequency, 4V ≤ V_IN ≤ 38V,
0.8V ≤ V_OUT ≤ 5.5V, 3mm × 4mm QFN-20, TSSOP-20E
LTC3860
Dual, Multiphase, Synchronous Step-Down DC/DC Controller with Operates with Power Blocks, DRMOS Devices or
Differential Amplifier and Three-State Output Drive
External Drivers/MOSFETs, 3V ≤ V_IN ≤ 24V, t_ON(MIN) = 20ns
LTC3850/LTC3850-1/ Dual Output, 2-Phase Synchronous Step-Down DC/DC Controller, PLL Fixed 250kHz to 780kHz Frequency, 4V ≤ V_IN ≤ 30V,
LTC3850-2
R_SENSE or DCR Current Sensing
0.8V ≤ V_OUT ≤ 5.25V
LTC3856
Single Output 2-Channel Synchronous Step-Down DC/DC
PLL Fixed 250kHz to 770kHz Frequency, 4.5V ≤ V_IN ≤ 38V,
Controller with Differential Amplifier and Up to 12-Phase Operation 0.8V ≤ V_OUT ≤ 5V
LTC3829
Single Output 3-Channel Synchronous Step-Down DC/DC
Phase-Lockable Fixed 250kHz to 770kHz Frequency,
Controller with Differential Amplifier and Up to 6-Phase Operation 4.5V ≤ V_IN ≤ 38V, 0.8V ≤ V_OUT ≤ 5V
LTC3853
Triple Output, Multiphase Synchronous Step-Down DC/DC
Controller, R_SENSE or DCR Current Sensing and Tracking
PLL Fixed 250kHz to 750kHz Frequency, 4V ≤ V_IN ≤ 24V,
V_OUT3 Up to 13.5V
38 Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
[phone] ^● FAX: [phone] ^● www.linear.com
3728lxff
LT 1211 REV F • PRINTED IN USA
 LINEAR TECHNOLOGY CORPORATION 2002