LTC3891 Series

Low IQ, 60V Synchronous Step-Down Controller

Manufacturer: Analog Devices Inc./Maxim Integrated

Catalog

Low IQ, 60V Synchronous Step-Down Controller

Part	Output Phases	Voltage - Supply (Vcc/Vdd) [Max]	Voltage - Supply (Vcc/Vdd) [Min]	Control Features	Supplier Device Package	Duty Cycle (Max) [Max]	Topology	Output Configuration	Number of Outputs	Mounting Type	Package / Case	Output Type	Frequency - Switching [Min]	Frequency - Switching [Max]	Operating Temperature [Min]	Operating Temperature [Max]	Function	Package / Case
Analog Devices Inc./Maxim Integrated LTC3891IUDC#PBF	1	60 V	4 V	Current Limit Enable Frequency Control Power Good Soft Start Tracking	20-QFN (3x4)	99 %	Buck	Positive	1	Surface Mount	20-WFQFN Exposed Pad	Transistor Driver	105 kHz 350 kHz	535 kHz 835 kHz	-40 C	125 °C	Step-Down
Analog Devices Inc./Maxim Integrated LTC3891HUDC#PBF	1	60 V	4 V	Current Limit Enable Frequency Control Power Good Soft Start Tracking	20-QFN (3x4)	99 %	Buck	Positive	1	Surface Mount	20-WFQFN Exposed Pad	Transistor Driver	105 kHz 350 kHz	535 kHz 835 kHz	-40 °C	150 °C	Step-Down
Analog Devices Inc./Maxim Integrated LTC3891EUDC#PBF	1	60 V	4 V	Current Limit Enable Frequency Control Power Good Soft Start Tracking	20-QFN (3x4)	99 %	Buck	Positive	1	Surface Mount	20-WFQFN Exposed Pad	Transistor Driver	105 kHz 350 kHz	535 kHz 835 kHz	-40 C	125 °C	Step-Down
Analog Devices Inc./Maxim Integrated LTC3891MPUDC#PBF	1	60 V	4 V	Current Limit Enable Frequency Control Power Good Soft Start Tracking	20-QFN (3x4)	99 %	Buck	Positive	1	Surface Mount	20-WFQFN Exposed Pad	Transistor Driver	105 kHz 350 kHz	535 kHz 835 kHz	-55 °C	150 °C	Step-Down
Analog Devices Inc./Maxim Integrated LTC3891MPFE#PBF	1	60 V	4 V	Current Limit Enable Frequency Control Power Good Soft Start Tracking	20-TSSOP-EP	99 %	Buck	Positive	1	Surface Mount	20-TSSOP Exposed Pad	Transistor Driver	105 kHz 350 kHz	535 kHz 835 kHz	-55 °C	150 °C	Step-Down	0.173 " 4.4 mm
Analog Devices Inc./Maxim Integrated LTC3891EUDC#TRPBF	1	60 V	4 V	Current Limit Enable Frequency Control Power Good Soft Start Tracking	20-QFN (3x4)	99 %	Buck	Positive	1	Surface Mount	20-WFQFN Exposed Pad	Transistor Driver	105 kHz 350 kHz	535 kHz 835 kHz	-40 C	125 °C	Step-Down
Analog Devices Inc./Maxim Integrated LTC3891IFE#TRPBF	1	60 V	4 V	Current Limit Enable Frequency Control Power Good Soft Start Tracking	20-TSSOP-EP	99 %	Buck	Positive	1	Surface Mount	20-TSSOP Exposed Pad	Transistor Driver	105 kHz 350 kHz	535 kHz 835 kHz	-40 C	125 °C	Step-Down	0.173 " 4.4 mm
Analog Devices Inc./Maxim Integrated LTC3891IFE#PBF	1	60 V	4 V	Current Limit Enable Frequency Control Power Good Soft Start Tracking	20-TSSOP-EP	99 %	Buck	Positive	1	Surface Mount	20-TSSOP Exposed Pad	Transistor Driver	105 kHz 350 kHz	535 kHz 835 kHz	-40 C	125 °C	Step-Down	0.173 " 4.4 mm
Analog Devices Inc./Maxim Integrated LTC3891MPFE#TRPBF	1	60 V	4 V	Current Limit Enable Frequency Control Power Good Soft Start Tracking	20-TSSOP-EP	99 %	Buck	Positive	1	Surface Mount	20-TSSOP Exposed Pad	Transistor Driver	105 kHz 350 kHz	535 kHz 835 kHz	-55 °C	150 °C	Step-Down	0.173 " 4.4 mm
Analog Devices Inc./Maxim Integrated LTC3891HFE#TRPBF	1	60 V	4 V	Current Limit Enable Frequency Control Power Good Soft Start Tracking	20-TSSOP-EP	99 %	Buck	Positive	1	Surface Mount	20-TSSOP Exposed Pad	Transistor Driver	105 kHz 350 kHz	535 kHz 835 kHz	-40 °C	150 °C	Step-Down	0.173 " 4.4 mm

Catalog

Low IQ, 60V Synchronous Step-Down Controller

Description

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