LTC3865LTC3865-1 Series

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

Catalog

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

Part	Output Configuration	Mounting Type	Operating Temperature [Min]	Operating Temperature [Max]	Voltage - Supply (Vcc/Vdd) [Max]	Voltage - Supply (Vcc/Vdd) [Min]	Duty Cycle (Max)	Topology	Frequency - Switching [Max]	Frequency - Switching [Min]	Control Features	Supplier Device Package	Number of Outputs	Function	Output Type	Output Phases	Package / Case
Analog Devices LTC3865IFE	Positive	Surface Mount	-40 °C	125 ¯C	38 V	4.5 V	95 %	Buck	770 kHz	250 kHz	Current Limit Enable Frequency Control Power Good Soft Start Tracking	38-TSSOP-EP	2	Step-Down	Transistor Driver	2	38-TFSOP
Analog Devices LTC3865IFE#PBF	Positive	Surface Mount	-40 °C	125 ¯C	38 V	4.5 V	95 %	Buck	770 kHz	250 kHz	Current Limit Enable Frequency Control Power Good Soft Start Tracking	38-TSSOP-EP	2	Step-Down	Transistor Driver	2	38-TFSOP
Analog Devices LTC3865IUH#TRPBF	Positive	Surface Mount	-40 °C	125 ¯C	38 V	4.5 V	95 %	Buck	770 kHz	250 kHz	Current Limit Enable Frequency Control Power Good Soft Start Tracking	32-QFN (5x5)	2	Step-Down	Transistor Driver	2
Analog Devices LTC3865EFE#PBF	Positive	Surface Mount	-40 °C	125 ¯C	38 V	4.5 V	95 %	Buck	770 kHz	250 kHz	Current Limit Enable Frequency Control Power Good Soft Start Tracking	38-TSSOP-EP	2	Step-Down	Transistor Driver	2	38-TFSOP
Analog Devices LTC3865EFE#TRPBF	Positive	Surface Mount	-40 °C	125 ¯C	38 V	4.5 V	95 %	Buck	770 kHz	250 kHz	Current Limit Enable Frequency Control Power Good Soft Start Tracking	38-TSSOP-EP	2	Step-Down	Transistor Driver	2	38-TFSOP

Catalog

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

Key Features

• Dual, 180° Phased Controllers

• 2-Pin VID Output Voltage Programming from 0.6V to 5V

• High Efficiency: Up to 95%

• RSENSEor DCR Current Sensing

• Phase-Lockable Fixed Frequency 250kHz to 770kHz

• Adjustable Current Limit

• Dual N-Channel MOSFET Synchronous Drive

• Wide VINRange: 4.5V to 38V Operation

• Adjustable Soft-Start Current Ramping or Tracking

• Output OV Protection With Reverse Current Limit

• Power Good Output Voltage Monitor

• 32-Pin 5mm × 5mm QFN and 38-Lead TSSOP Packages

Description

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