LTC3731HUH#PBF

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Analog Devices Inc./Maxim Integrated

SWITCHING VOLTAGE REGULATORS 3-PHASE, 600KHZ, SYNC BUCK SW REG CNTR

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LTC3731HUH#PBF

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Analog Devices Inc./Maxim Integrated

SWITCHING VOLTAGE REGULATORS 3-PHASE, 600KHZ, SYNC BUCK SW REG CNTR

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Description Specifications Series Pricing CAD Documents

Description

General part information

LTC3731 Series

The LTC3731 is a PolyPhase®synchronous step-down switching regulator controller that drives all N-channel external power MOSFET stages in a phase-lockable fixed frequency architecture. The 3-phase controller drives its output stages with 120° phase separation at frequencies of up to 600kHz per phase to minimize the RMS current losses in both the input and output filter capacitors. The 3-phase technique effectively triples the fundamental frequency, improving transient response while operating each controller at an optimal frequency for efficiency and ease of thermal design. 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 both the high and low side of the output voltage at the point of load. The precision reference supports output voltages from 0.6V to 6V.Soft-start and a defeatable, timed short-circuit shutdown protect the MOSFETs and the load. Current foldback provides protection for the external MOSFETs under short-circuit or overload conditions.ApplicationsDesktop Computers and ServersHigh Performance Notebook ComputersHigh Output Current DC/DC Power Supplies

Technical Specifications

Parameters and characteristics for this part

Specification	LTC3731HUH#PBF

Clock Sync	No
Control Features	Power Good, Enable, Phase Control, Soft Start
Duty Cycle (Max)	98.5 %
Frequency - Switching (Max)	680 kHz
Frequency - Switching (Min)	225 kHz
Function	Step-Down
Mounting Type	Surface Mount
Number of Outputs	3
Operating Temperature (Max)	140 °C
Operating Temperature (Min)	-40 °C
Output Configuration	Positive
Output Phases	3
Output Type	Transistor Driver
Package / Case	32-WFQFN Exposed Pad
Package Length	5 mm
Package Name	32-QFN
Package Width	5 mm
Synchronous Rectifier	Yes
Topology	Buck
Voltage - Supply (Vcc/Vdd) Maximum	7 V
Voltage - Supply (Vcc/Vdd) Minimum	3.8 V

LTC3731 Series

3-Phase, 600kHz, Synchronous Buck Switching Regulator Controller

Part	Topology	Function	Output Type	Output Configuration	Frequency - Switching (Max)	Frequency - Switching (Min)	Output Phases	Control Features	Operating Temperature (Max)	Operating Temperature (Min)	Clock Sync	Package Width	Package Name	Package Length	Mounting Type	Synchronous Rectifier	Package / Case	Voltage - Supply (Vcc/Vdd) Maximum	Voltage - Supply (Vcc/Vdd) Minimum	Duty Cycle (Max)	Number of Outputs
Analog Devices Inc./Maxim Integrated LTC3731IUH#TRPBF	Buck	Step-Down	Transistor Driver	Positive	680 kHz	225 kHz	3	Enable Phase Control Power Good Soft Start	85 °C	-40 °C	No	5 mm	32-QFN	5 mm	Surface Mount	Yes	32-WFQFN Exposed Pad	7 V	3.8 V	98.5 %	3
Analog Devices Inc./Maxim Integrated LTC3731CG#TRPBF	Buck	Step-Down	Transistor Driver	Positive	680 kHz	225 kHz	3	Enable Phase Control Power Good Soft Start	70 °C	0 °C	No	5.3 mm	36-SSOP	0.209 in	Surface Mount	Yes		7 V	3.8 V	98.5 %	3
Analog Devices Inc./Maxim Integrated LTC3731CUH#PBF	Buck	Step-Down	Transistor Driver	Positive	680 kHz	225 kHz	3	Enable Phase Control Power Good Soft Start	70 °C	0 °C	No	5 mm	32-QFN	5 mm	Surface Mount	Yes	32-WFQFN Exposed Pad	7 V	3.8 V	98.5 %	3
Analog Devices Inc./Maxim Integrated LTC3731HUH#PBF	Buck	Step-Down	Transistor Driver	Positive	680 kHz	225 kHz	3	Enable Phase Control Power Good Soft Start	140 °C	-40 °C	No	5 mm	32-QFN	5 mm	Surface Mount	Yes	32-WFQFN Exposed Pad	7 V	3.8 V	98.5 %	3
Analog Devices Inc./Maxim Integrated LTC3731IG#TRPBF	Buck	Step-Down	Transistor Driver	Positive	680 kHz	225 kHz	3	Enable Phase Control Power Good Soft Start	85 °C	-40 °C	No	5.3 mm	36-SSOP	0.209 in	Surface Mount	Yes		7 V	3.8 V	98.5 %	3
Analog Devices Inc./Maxim Integrated LTC3731IUH#PBF	Buck	Step-Down	Transistor Driver	Positive	680 kHz	225 kHz	3	Enable Phase Control Power Good Soft Start	85 °C	-40 °C	No	5 mm	32-QFN	5 mm	Surface Mount	Yes	32-WFQFN Exposed Pad	7 V	3.8 V	98.5 %	3
Analog Devices Inc./Maxim Integrated LTC3731HUH#PBF	Buck	Step-Down	Transistor Driver	Positive	680 kHz	225 kHz	3	Enable Phase Control Power Good Soft Start	140 °C	-40 °C	No	5 mm	32-QFN	5 mm	Surface Mount	Yes	32-WFQFN Exposed Pad	7 V	3.8 V	98.5 %	3
Analog Devices Inc./Maxim Integrated LTC3731IG#PBF	Buck	Step-Down	Transistor Driver	Positive	680 kHz	225 kHz	3	Enable Phase Control Power Good Soft Start	85 °C	-40 °C	No	5.3 mm	36-SSOP	0.209 in	Surface Mount	Yes		7 V	3.8 V	98.5 %	3
Analog Devices Inc./Maxim Integrated LTC3731CG#PBF	Buck	Step-Down	Transistor Driver	Positive	680 kHz	225 kHz	3	Enable Phase Control Power Good Soft Start	70 °C	0 °C	No	5.3 mm	36-SSOP	0.209 in	Surface Mount	Yes		7 V	3.8 V	98.5 %	3
Analog Devices Inc./Maxim Integrated LTC3731HUH#TRPBF	Buck	Step-Down	Transistor Driver	Positive	680 kHz	225 kHz	3	Enable Phase Control Power Good Soft Start	140 °C	-40 °C	No	5 mm	32-QFN	5 mm	Surface Mount	Yes	32-WFQFN Exposed Pad	7 V	3.8 V	98.5 %	3

Pricing

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CAD

3D models and CAD resources for this part

Documents

Technical documentation and resources

LTC3731HUH#PBF | Datasheet

R384 Reliability Data