LTC3829 Series

3-Phase, Single Output Synchronous Step-Down DC/DC Controller with Diffamp

Catalog

3-Phase, Single Output Synchronous Step-Down DC/DC Controller with Diffamp

Part	Output Configuration	Output Phases	Duty Cycle (Max) [Max]	Operating Temperature [Min]	Operating Temperature [Max]	Topology	Voltage - Supply (Vcc/Vdd) [Max]	Voltage - Supply (Vcc/Vdd) [Min]	Frequency - Switching [Max]	Frequency - Switching [Min]	Control Features	Number of Outputs	Output Type	Package / Case	Function	Mounting Type	Supplier Device Package
Analog Devices LTC3829EUHF#PBF	Positive	3	94 %	-40 °C	125 ¯C	Buck	38 V	4.5 V	770 kHz	250 kHz	Current Limit Enable Frequency Control Power Good Soft Start Tracking	3	Transistor Driver	38-WFQFN Exposed Pad	Step-Down	Surface Mount
Analog Devices LTC3829IUHF#PBF	Positive	3	94 %	-40 °C	125 ¯C	Buck	38 V	4.5 V	770 kHz	250 kHz	Current Limit Enable Frequency Control Power Good Soft Start Tracking	3	Transistor Driver	38-WFQFN Exposed Pad	Step-Down	Surface Mount
Analog Devices LTC3829EUHF#TRPBF	Positive	3	94 %	-40 °C	125 ¯C	Buck	38 V	4.5 V	770 kHz	250 kHz	Current Limit Enable Frequency Control Power Good Soft Start Tracking	3	Transistor Driver	38-WFQFN Exposed Pad	Step-Down	Surface Mount
Analog Devices LTC3829EFE#PBF	Positive	3	94 %	-40 °C	125 ¯C	Buck	38 V	4.5 V	770 kHz	250 kHz	Current Limit Enable Frequency Control Power Good Soft Start Tracking	3	Transistor Driver	38-TFSOP	Step-Down	Surface Mount	38-TSSOP-EP
Analog Devices LTC3829IFE#WTRPBF	Positive	3	94 %	-40 °C	125 ¯C	Buck	38 V	4.5 V	770 kHz	250 kHz	Current Limit Enable Frequency Control Power Good Soft Start Tracking	3	Transistor Driver	38-TFSOP	Step-Down	Surface Mount	38-TSSOP-EP
Analog Devices LTC3829IFE#TRPBF	Positive	3	94 %	-40 °C	125 ¯C	Buck	38 V	4.5 V	770 kHz	250 kHz	Current Limit Enable Frequency Control Power Good Soft Start Tracking	3	Transistor Driver	38-TFSOP	Step-Down	Surface Mount	38-TSSOP-EP

Catalog

3-Phase, Single Output Synchronous Step-Down DC/DC Controller with Diffamp

Key Features

• Optional Nonlinear Control for Fast Response

• ±0.75%, 0.6V Reference Accuracy

• PWM, Stage Shedding™or Burst Mode®Operation

• High Efficiency: Up to 95%

• RSENSEor DCR Current Sensing

• Programmable DCR Temperature Compensation

• Phase-Lockable Fixed Frequency: 250kHz to 770kHz

• True Remote Sense Differential Amplifier

• Programmable Active Voltage Positioning (AVP)

• Triple N-Channel MOSFET Synchronous Drive

• Wide VINRange: 4.5V to 38V Operation

• VOUTRange: 0.6V to 5V without Diffamp

• VOUTRange: 0.6V to 3.3V with Diffamp

• Clock Input and Output for 6-Phase Operation

• Adjustable Soft-Start or VOUTTracking

• 38-Pin (5mm × 7mm) QFN and FE Packages

• AEC-Q100 Qualified for Automotive Applications

Description

The LTC3829 is a high performance 3-phase single output synchronous step-down DC/DC switching controller that drives all N-channel synchronous power MOSFET stages. A constant frequency current mode architecture allows a phase-lockable frequency of up to 770kHz. Power loss and noise due to ESR of the input capacitors are minimized by operating the three controller output stages out of phase.The LTC3829 can be configured for 6-phase operation, has DCR temperature compensation, and output foldback current limiting. This device features a precision 0.6V reference and a power good indicator.Light load efficiency is optimized by using a choice of output Stage Shedding or Burst Mode operation. A differential amplifier provides true remote sensing of the output voltage at the point of load.The LTC3829 is available in both low profile 38-pin 5mm × 7mm QFN and Exposed Pad FE packages.ApplicationsNotebook and Palmtop ComputersTelecom SystemsDC Power Distribution Systems