LTC3855IFE#PBF

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Analog Devices

DUAL, MULTIPHASE SYNCHRONOUS DC/DC CONTROLLER WITH DIFFERENTIAL REMOTE SENSE

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LTC3855IFE#PBF

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Analog Devices

DUAL, MULTIPHASE SYNCHRONOUS DC/DC CONTROLLER WITH DIFFERENTIAL REMOTE SENSE

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DocumentsDatasheet R526 Reliability Data

Specifications Pricing Series Description Documents

Technical Specifications

Parameters and characteristics for this part

Specification	LTC3855IFE#PBF

Clock Sync	False
Control Features	Tracking, Soft Start, Current Limit, Enable, Phase Control, Power Good, Frequency Control
Duty Cycle (Max)	95 %
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	38-TFSOP
Supplier Device Package	38-TSSOP-EP
Synchronous Rectifier	True
Topology	Buck
Voltage - Supply (Vcc/Vdd) [Max]	38 V
Voltage - Supply (Vcc/Vdd) [Min]	4.5 V

LTC3855 Series

Part	Function	Frequency - Switching [Max]	Frequency - Switching [Min]	Package / Case	Output Phases	Duty Cycle (Max)	Output Type	Topology	Mounting Type	Supplier Device Package	Number of Outputs	Output Configuration	Voltage - Supply (Vcc/Vdd) [Max]	Voltage - Supply (Vcc/Vdd) [Min]	Control Features	Operating Temperature [Min]	Operating Temperature [Max]
Analog Devices LTC3855IUJ	Step-Down	770 kHz	250 kHz	40-WFQFN Exposed Pad	2	95 %	Transistor Driver	Buck	Surface Mount	40-QFN (6x6)	2	Positive	38 V	4.5 V	Current Limit Enable Frequency Control Phase Control Power Good Soft Start Tracking	-40 °C	125 ¯C
Analog Devices LTC3855EFE#TRPBF	Step-Down	770 kHz	250 kHz	38-TFSOP	2	95 %	Transistor Driver	Buck	Surface Mount	38-TSSOP-EP	2	Positive	38 V	4.5 V	Current Limit Enable Frequency Control Phase Control Power Good Soft Start Tracking	-40 °C	85 °C
Analog Devices LTC3855EUJ#TRPBF	Step-Down	770 kHz	250 kHz	40-WFQFN Exposed Pad	2	95 %	Transistor Driver	Buck	Surface Mount	40-QFN (6x6)	2	Positive	38 V	4.5 V	Current Limit Enable Frequency Control Phase Control Power Good Soft Start Tracking	-40 °C	85 °C
Analog Devices LTC3855EUJ#PBF	Step-Down	770 kHz	250 kHz	40-WFQFN Exposed Pad	2	95 %	Transistor Driver	Buck	Surface Mount	40-QFN (6x6)	2	Positive	38 V	4.5 V	Current Limit Enable Frequency Control Phase Control Power Good Soft Start Tracking	-40 °C	85 °C
Analog Devices LTC3855IFE#PBF	Step-Down	770 kHz	250 kHz	38-TFSOP	2	95 %	Transistor Driver	Buck	Surface Mount	38-TSSOP-EP	2	Positive	38 V	4.5 V	Current Limit Enable Frequency Control Phase Control Power Good Soft Start Tracking	-40 °C	125 ¯C

Pricing

Prices provided here are for design reference only. For realtime values and availability, please visit the distributors directly

Distributor	Package	Quantity	$

Digikey	Tube	1	$ 12.57
		10	$ 8.87
		25	$ 7.91
		100	$ 6.85
		250	$ 6.33
		500	$ 6.01
		1000	$ 5.79

Description

General part information

LTC3855 Series

The LTC3855 is a dual PolyPhase®current mode synchronous step-down switching regulator controller that drives all N-channel power MOSFET stages. It includes a high speed differential remote sense amplifier. The maximum current sense voltage is programmable for either 30mV, 50mV or 75mV, allowing the use of either the inductor DCR or a discrete sense resistor as the sensing element.The LTC3855 features a precision 0.6V reference and can produce output voltages up to 12.5V. A wide 4.5V to 38V input supply range encompasses most intermediate bus voltages and battery chemistries. Power loss and supply noise are minimized by operating the two controller output stages out of phase. Burst Mode®operation, continuous or pulse-skipping modes are supported.The LTC3855 can be configured for up to 12-phase operation, has DCR temperature compensation, two power good signals and two current limit set pins. The LTC3855 is available in low profile 40-pin 6mm × 6mm QFN and 38-lead exposed pad FE packages.ApplicationsComputer SystemsTelecom SystemsIndustrial and Medical InstrumentsDC Power Distribution Systems