LTC3856IUH#PBF

Active

Analog Devices Inc./Maxim Integrated

2-PHASE SYNCHRONOUS STEP-DOWN DC/DC CONTROLLER WITH DIFFAMP

LTC3856IUH#PBF

Active

Analog Devices Inc./Maxim Integrated

2-PHASE SYNCHRONOUS STEP-DOWN DC/DC CONTROLLER WITH DIFFAMP

Description Specifications Series Pricing CAD Documents

Description

General part information

LTC3856 Series

The LTC3856 is a single output, dual channel PolyPhase synchronous step-down DC/DC controller that drives all N-channel power MOSFET stages. This device includes a high speed differential amplifier for remote output voltage sense. Power loss and supply noise are minimized by operating the two controller output stages out-of-phase and up to 12-phase operation can be achieved.The LTC3856 monitors the output current by sensing the voltage drop across the output inductor (DCR) or by using a sense resistor. DCR temperature compensation maintains an accurate current sense threshold over a broad temperature range. A constant-frequency, current mode architecture allows a phase-lockable frequency of up to 770kHz.A wide 4.5V to 38V input supply range encompasses most intermediate bus voltages and battery chemistries. Burst Mode operation, continuous or Stage Shedding modes are supported. A TK/SS pin shared by both channels ramps the output voltage during start-up.ApplicationsTelecom and Datacom SystemsIndustrial and Medical InstrumentsDC Power Distribution SystemsComputer Systems

Technical Specifications

Parameters and characteristics for this part

Specification	LTC3856IUH#PBF

Clock Sync	No
Control Features	Enable, Current Limit, Soft Start, Tracking, Phase Control, Power Good, Frequency Control
Duty Cycle (Max)	94 %
Frequency - Switching (Max)	770 kHz
Frequency - Switching (Min)	250 kHz
Function	Step-Down
Mounting Type	Surface Mount
Number of Outputs	2
Operating Temperature (Max)	125 °C
Operating Temperature (Min)	-40 °C
Output Configuration	Positive
Output Phases	2
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	38 V
Voltage - Supply (Vcc/Vdd) Minimum	4.5 V

LTC3856 Series

Part	Frequency - Switching (Min)	Frequency - Switching (Max)	Output Configuration	Operating Temperature (Max)	Operating Temperature (Min)	Voltage - Supply (Vcc/Vdd) Maximum	Voltage - Supply (Vcc/Vdd) Minimum	Topology	Number of Outputs	Output Type	Function	Duty Cycle (Max)	Mounting Type	Synchronous Rectifier	Package / Case	Clock Sync	Package Width	Package Name	Package Length	Output Phases	Control Features	Package Features
Analog Devices Inc./Maxim Integrated LTC3856IUH#PBF	250 kHz	770 kHz	Positive	125 °C	-40 °C	38 V	4.5 V	Buck	2	Transistor Driver	Step-Down	94 %	Surface Mount	Yes	32-WFQFN Exposed Pad	No	5 mm	32-QFN	5 mm	2	Current Limit Enable Frequency Control Phase Control Power Good Soft Start Tracking
Analog Devices Inc./Maxim Integrated LTC3856EUH#TRPBF	250 kHz	770 kHz	Positive	125 °C	-40 °C	38 V	4.5 V	Buck	2	Transistor Driver	Step-Down	94 %	Surface Mount	Yes	32-WFQFN Exposed Pad	No	5 mm	32-QFN	5 mm	2	Current Limit Enable Frequency Control Phase Control Power Good Soft Start Tracking
Analog Devices Inc./Maxim Integrated LTC3856EUH#PBF	250 kHz	770 kHz	Positive	125 °C	-40 °C	38 V	4.5 V	Buck	2	Transistor Driver	Step-Down	94 %	Surface Mount	Yes	32-WFQFN Exposed Pad	No	5 mm	32-QFN	5 mm	2	Current Limit Enable Frequency Control Phase Control Power Good Soft Start Tracking
Analog Devices Inc./Maxim Integrated LTC3856IFE#PBF	250 kHz	770 kHz	Positive	125 °C	-40 °C	38 V	4.5 V	Buck	2	Transistor Driver	Step-Down	94 %	Surface Mount	Yes		No	4.4 mm	38-TFSOP 38-TSSOP-EP	0.173 in	2	Current Limit Enable Frequency Control Phase Control Power Good Soft Start Tracking	Exposed Pad
Analog Devices Inc./Maxim Integrated LTC3856IFE#TRPBF	250 kHz	770 kHz	Positive	125 °C	-40 °C	38 V	4.5 V	Buck	2	Transistor Driver	Step-Down	94 %	Surface Mount	Yes		No	4.4 mm	38-TFSOP 38-TSSOP-EP	0.173 in	2	Current Limit Enable Frequency Control Phase Control Power Good Soft Start Tracking	Exposed Pad
Analog Devices Inc./Maxim Integrated LTC3856EFE#PBF	250 kHz	770 kHz	Positive	125 °C	-40 °C	38 V	4.5 V	Buck	2	Transistor Driver	Step-Down	94 %	Surface Mount	Yes		No	4.4 mm	38-TFSOP 38-TSSOP-EP	0.173 in	2	Current Limit Enable Frequency Control Phase Control Power Good Soft Start Tracking	Exposed Pad
Analog Devices Inc./Maxim Integrated LTC3856IUH#TRPBF	250 kHz	770 kHz	Positive	125 °C	-40 °C	38 V	4.5 V	Buck	2	Transistor Driver	Step-Down	94 %	Surface Mount	Yes	32-WFQFN Exposed Pad	No	5 mm	32-QFN	5 mm	2	Current Limit Enable Frequency Control Phase Control Power Good Soft Start Tracking
Analog Devices Inc./Maxim Integrated LTC3856EFE#TRPBF	250 kHz	770 kHz	Positive	125 °C	-40 °C	38 V	4.5 V	Buck	2	Transistor Driver	Step-Down	94 %	Surface Mount	Yes		No	4.4 mm	38-TFSOP 38-TSSOP-EP	0.173 in	2	Current Limit Enable Frequency Control Phase Control Power Good Soft Start Tracking	Exposed Pad

Pricing

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CAD

3D models and CAD resources for this part

Documents

Technical documentation and resources

LTC3856IUH#PBF | Datasheet

R526 Reliability Data