LTC3865IUH-1#PBF

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Analog Devices Inc./Maxim Integrated

DUAL, 2-PHASE SYNCHRONOUS DC/DC CONTROLLER WITH PIN SELECTABLE OUTPUTS

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LTC3865IUH-1#PBF

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Analog Devices Inc./Maxim Integrated

DUAL, 2-PHASE SYNCHRONOUS DC/DC CONTROLLER WITH PIN SELECTABLE OUTPUTS

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Description Specifications Series Pricing CAD Documents

Description

General part information

LTC3865LTC3865-1 Series

The LTC3865/LTC3865-1 are high performance dual synchronous step-down DC/DC switching regulator controllers that drive all N-channel synchronous power MOSFET stages. A constant frequency current mode architecture allows a phase-lockable frequency of up to 770kHz. Power loss and noise are minimized by operating the two controller output stages out of phase.OPTI-LOOP®compensation allows the transient response to be optimized over a wide range of output capacitance and ESR values. Independent track/soft-start pins for each controller ramp the output voltage during start-up. Current foldback limits MOSFET heat dissipation during short-circuit conditions. The MODE/PLLIN pin selects among Burst Mode®operation, pulse-skipping mode, and continuous inductor current mode. The output voltages can be precisely programmed by pin strapping or external resistors.The LTC3865/LTC3865-1 are available in low profile (5mm × 5mm) 32-pin QFN and 38-Lead thermally enhanced TSSOP packages.ApplicationsDC Power Distribution Systems

Technical Specifications

Parameters and characteristics for this part

Specification	LTC3865IUH-1#PBF

Clock Sync	No
Control Features	Power Good, Soft Start, Frequency Control, Current Limit, Enable, Tracking
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	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

LTC3865LTC3865-1 Series

Dual, 2-Phase Synchronous DC/DC Controller with Pin Selectable Outputs

Part	Output Configuration	Output Type	Package Name	Control Features	Mounting Type	Clock Sync	Operating Temperature (Max)	Operating Temperature (Min)	Output Phases	Voltage - Supply (Vcc/Vdd) Maximum	Voltage - Supply (Vcc/Vdd) Minimum	Function	Frequency - Switching (Min)	Frequency - Switching (Max)	Duty Cycle (Max)	Synchronous Rectifier	Package Width	Package Features	Package Length	Topology	Number of Outputs	Package / Case
Analog Devices Inc./Maxim Integrated LTC3865IFE#PBF	Positive	Transistor Driver	38-TFSOP 38-TSSOP-EP	Current Limit Enable Frequency Control Power Good Soft Start Tracking	Surface Mount	No	125 °C	-40 °C	2	38 V	4.5 V	Step-Down	250 kHz	770 kHz	95 %	Yes	4.4 mm	Exposed Pad	0.173 in	Buck	2
Analog Devices Inc./Maxim Integrated LTC3865IUH#PBF	Positive	Transistor Driver	32-QFN	Current Limit Enable Frequency Control Power Good Soft Start Tracking	Surface Mount	No	125 °C	-40 °C	2	38 V	4.5 V	Step-Down	250 kHz	770 kHz	95 %	Yes	5 mm		5 mm	Buck	2	32-WFQFN Exposed Pad
Analog Devices Inc./Maxim Integrated LTC3865IUH#TRPBF	Positive	Transistor Driver	32-QFN	Current Limit Enable Frequency Control Power Good Soft Start Tracking	Surface Mount	No	125 °C	-40 °C	2	38 V	4.5 V	Step-Down	250 kHz	770 kHz	95 %	Yes	5 mm		5 mm	Buck	2	32-WFQFN Exposed Pad
Analog Devices Inc./Maxim Integrated LTC3865IUH-1#TRPBF	Positive	Transistor Driver	32-QFN	Current Limit Enable Frequency Control Power Good Soft Start Tracking	Surface Mount	No	125 °C	-40 °C	2	38 V	4.5 V	Step-Down	250 kHz	770 kHz	95 %	Yes	5 mm		5 mm	Buck	2	32-WFQFN Exposed Pad
Analog Devices Inc./Maxim Integrated LTC3865EFE#PBF	Positive	Transistor Driver	38-TFSOP 38-TSSOP-EP	Current Limit Enable Frequency Control Power Good Soft Start Tracking	Surface Mount	No	125 °C	-40 °C	2	38 V	4.5 V	Step-Down	250 kHz	770 kHz	95 %	Yes	4.4 mm	Exposed Pad	0.173 in	Buck	2
Analog Devices Inc./Maxim Integrated LTC3865IUH-1#PBF	Positive	Transistor Driver	32-QFN	Current Limit Enable Frequency Control Power Good Soft Start Tracking	Surface Mount	No	125 °C	-40 °C	2	38 V	4.5 V	Step-Down	250 kHz	770 kHz	95 %	Yes	5 mm		5 mm	Buck	2	32-WFQFN Exposed Pad
Analog Devices Inc./Maxim Integrated LTC3865EUH#PBF	Positive	Transistor Driver	32-QFN	Current Limit Enable Frequency Control Power Good Soft Start Tracking	Surface Mount	No	125 °C	-40 °C	2	38 V	4.5 V	Step-Down	250 kHz	770 kHz	95 %	Yes	5 mm		5 mm	Buck	2	32-WFQFN Exposed Pad
Analog Devices Inc./Maxim Integrated LTC3865EUH#TRPBF	Positive	Transistor Driver	32-QFN	Current Limit Enable Frequency Control Power Good Soft Start Tracking	Surface Mount	No	125 °C	-40 °C	2	38 V	4.5 V	Step-Down	250 kHz	770 kHz	95 %	Yes	5 mm		5 mm	Buck	2	32-WFQFN Exposed Pad
Analog Devices Inc./Maxim Integrated LTC3865EFE#TRPBF	Positive	Transistor Driver	38-TFSOP 38-TSSOP-EP	Current Limit Enable Frequency Control Power Good Soft Start Tracking	Surface Mount	No	125 °C	-40 °C	2	38 V	4.5 V	Step-Down	250 kHz	770 kHz	95 %	Yes	4.4 mm	Exposed Pad	0.173 in	Buck	2
Analog Devices Inc./Maxim Integrated LTC3865EUH-1#TRPBF	Positive	Transistor Driver	32-QFN	Current Limit Enable Frequency Control Power Good Soft Start Tracking	Surface Mount	No	125 °C	-40 °C	2	38 V	4.5 V	Step-Down	250 kHz	770 kHz	95 %	Yes	5 mm		5 mm	Buck	2	32-WFQFN Exposed Pad

Pricing

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CAD

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Documents

Technical documentation and resources

R526 Reliability Data

LTC3865IUH-1#PBF | Datasheet