LTC3891HFE#PBF

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Analog Devices

LOW IQ, 60V SYNCHRONOUS STEP-DOWN CONTROLLER

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LTC3891HFE#PBF

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Analog Devices

LOW IQ, 60V SYNCHRONOUS STEP-DOWN CONTROLLER

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DocumentsDatasheet R526 Reliability Data

Specifications Pricing Series Description Documents

Technical Specifications

Parameters and characteristics for this part

Specification	LTC3891HFE#PBF

Clock Sync	False
Control Features	Power Good, Soft Start, Tracking, Frequency Control, Enable, Current Limit
Duty Cycle (Max) [Max]	99 %
Frequency - Switching [Max]	535 kHz, 835 kHz
Frequency - Switching [Min]	350 kHz, 105 kHz
Function	Step-Down
Mounting Type	Surface Mount
Number of Outputs	1
Operating Temperature [Max]	150 °C
Operating Temperature [Min]	-40 °C
Output Configuration	Positive
Output Phases	1
Output Type	Transistor Driver
Package / Case [custom]	4.4 mm, 0.173 in
Package / Case [custom]	Exposed Pad
Package / Case [custom]	20-TSSOP
Supplier Device Package	20-TSSOP-EP
Synchronous Rectifier	True
Topology	Buck
Voltage - Supply (Vcc/Vdd) [Max]	60 V
Voltage - Supply (Vcc/Vdd) [Min]	4 V

LTC3891 Series

Low IQ, 60V Synchronous Step-Down Controller

Part	Output Configuration	Supplier Device Package	Mounting Type	Topology	Operating Temperature [Min]	Operating Temperature [Max]	Frequency - Switching [Max]	Frequency - Switching [Min]	Voltage - Supply (Vcc/Vdd) [Max]	Voltage - Supply (Vcc/Vdd) [Min]	Function	Output Phases	Number of Outputs	Control Features	Package / Case	Output Type	Duty Cycle (Max) [Max]	Package / Case [custom]	Package / Case [custom]	Package / Case [custom]
Analog Devices LTC3891EUDC#TRPBF	Positive	20-QFN (3x4)	Surface Mount	Buck	-40 °C	125 ¯C	535 kHz 835 kHz	105 kHz 350 kHz	60 V	4 V	Step-Down	1	1	Current Limit Enable Frequency Control Power Good Soft Start Tracking	20-WFQFN Exposed Pad	Transistor Driver	99 %
Analog Devices LTC3891IFE#PBF	Positive	20-TSSOP-EP	Surface Mount	Buck	-40 °C	125 ¯C	535 kHz 835 kHz	105 kHz 350 kHz	60 V	4 V	Step-Down	1	1	Current Limit Enable Frequency Control Power Good Soft Start Tracking		Transistor Driver	99 %	0.173 in 4.4 mm	Exposed Pad	20-TSSOP
Analog Devices LTC3891MPUDC#TRPBF	Positive	20-QFN (3x4)	Surface Mount	Buck	-55 °C	150 °C	535 kHz 835 kHz	105 kHz 350 kHz	60 V	4 V	Step-Down	1	1	Current Limit Enable Frequency Control Power Good Soft Start Tracking	20-WFQFN Exposed Pad	Transistor Driver	99 %
Analog Devices LTC3891IUDC#TRPBF	Positive	20-QFN (3x4)	Surface Mount	Buck	-40 °C	125 ¯C	535 kHz 835 kHz	105 kHz 350 kHz	60 V	4 V	Step-Down	1	1	Current Limit Enable Frequency Control Power Good Soft Start Tracking	20-WFQFN Exposed Pad	Transistor Driver	99 %
Analog Devices LTC3891HFE#PBF	Positive	20-TSSOP-EP	Surface Mount	Buck	-40 °C	150 °C	535 kHz 835 kHz	105 kHz 350 kHz	60 V	4 V	Step-Down	1	1	Current Limit Enable Frequency Control Power Good Soft Start Tracking		Transistor Driver	99 %	0.173 in 4.4 mm	Exposed Pad	20-TSSOP
Analog Devices LTC3891HUDC#TRPBF	Positive	20-QFN (3x4)	Surface Mount	Buck	-40 °C	150 °C	535 kHz 835 kHz	105 kHz 350 kHz	60 V	4 V	Step-Down	1	1	Current Limit Enable Frequency Control Power Good Soft Start Tracking	20-WFQFN Exposed Pad	Transistor Driver	99 %

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	$ 14.03
		10	$ 9.96
		25	$ 8.92
		100	$ 7.75
		250	$ 7.18
		500	$ 6.84
		1000	$ 6.66

Description

General part information

LTC3891 Series

The LTC3891 is a high performance step-down switching regulator DC/DC controller that drives an all N-channel synchronous power MOSFET stage. A constant frequency current mode architecture allows a phase-lockable frequency of up to 750kHz.The 50μA no-load quiescent current extends operating run time in battery-powered systems. OPTI-LOOP®compensation allows the transient response to be optimized over a wide range of output capacitance and ESR values. The LTC3891 features a precision 0.8V reference and power good output indicator. A wide 4V to 60V input supply range encompasses a wide range of intermediate bus voltages and battery chemistries. The output voltage of the LTC3891 can be programmed between 0.8V to 24V.The TRACK/SS pin ramps the output voltages during start-up. Current foldback limits MOSFET heat dissipation during short-circuit conditions. The PLLIN/MODE pin selects among Burst Mode operation, pulse-skipping mode, or continuous conduction mode at light loads.ApplicationsAutomotive Always-On SystemsBattery Powered Digital DevicesDistributed DC Power Systems