LTC3864 Series

60V Low IQStep-Down DC/DC Controller with 100% Duty Cycle Capability

Catalog

60V Low IQStep-Down DC/DC Controller with 100% Duty Cycle Capability

Part	Duty Cycle (Max) [Max]	Operating Temperature [Min]	Operating Temperature [Max]	Control Features	Topology	Function	Frequency - Switching [Min]	Frequency - Switching [Max]	Number of Outputs	Output Phases	Output Type	Output Configuration	Supplier Device Package	Package / Case	Mounting Type	Voltage - Supply (Vcc/Vdd) [Max]	Voltage - Supply (Vcc/Vdd) [Min]	Package / Case
Analog Devices LTC3864MPDE#TRPBF	100 %	-55 °C	150 °C	Current Limit Enable Frequency Control Power Good Soft Start	Buck	Step-Down	50 kHz	850 kHz	1	1	Transistor Driver	Positive	12-DFN (4x3)	12-WFDFN Exposed Pad	Surface Mount	60 V	3.5 V
Analog Devices LTC3864EDE#PBF	100 %	-40 °C	125 ¯C	Current Limit Enable Frequency Control Power Good Soft Start	Buck	Step-Down	50 kHz	850 kHz	1	1	Transistor Driver	Positive	12-DFN (4x3)	12-WFDFN Exposed Pad	Surface Mount	60 V	3.5 V
Analog Devices LTC3864EMSE#TRPBF	100 %	-40 °C	125 ¯C	Current Limit Enable Frequency Control Power Good Soft Start	Buck	Step-Down	50 kHz	850 kHz	1	1	Transistor Driver	Positive	12-MSOP-EP	12-TSSOP Exposed Pad	Surface Mount	60 V	3.5 V	0.118 in 3 mm
Analog Devices LTC3864HMSE#TRPBF	100 %	-40 °C	150 °C	Current Limit Enable Frequency Control Power Good Soft Start	Buck	Step-Down	50 kHz	850 kHz	1	1	Transistor Driver	Positive	12-MSOP-EP	12-TSSOP Exposed Pad	Surface Mount	60 V	3.5 V	0.118 in 3 mm
Analog Devices LTC3864EDE#TRPBF	100 %	-40 °C	125 ¯C	Current Limit Enable Frequency Control Power Good Soft Start	Buck	Step-Down	50 kHz	850 kHz	1	1	Transistor Driver	Positive	12-DFN (4x3)	12-WFDFN Exposed Pad	Surface Mount	60 V	3.5 V
Analog Devices LTC3864MPMSE#PBF	100 %	-55 °C	150 °C	Current Limit Enable Frequency Control Power Good Soft Start	Buck	Step-Down	50 kHz	850 kHz	1	1	Transistor Driver	Positive	12-MSOP-EP	12-TSSOP Exposed Pad	Surface Mount	60 V	3.5 V	0.118 in 3 mm
Analog Devices LTC3864HMSE#PBF	100 %	-40 °C	150 °C	Current Limit Enable Frequency Control Power Good Soft Start	Buck	Step-Down	50 kHz	850 kHz	1	1	Transistor Driver	Positive	12-MSOP-EP	12-TSSOP Exposed Pad	Surface Mount	60 V	3.5 V	0.118 in 3 mm
Analog Devices LTC3864HDE#PBF	100 %	-40 °C	150 °C	Current Limit Enable Frequency Control Power Good Soft Start	Buck	Step-Down	50 kHz	850 kHz	1	1	Transistor Driver	Positive	12-DFN (4x3)	12-WFDFN Exposed Pad	Surface Mount	60 V	3.5 V

Catalog

60V Low IQStep-Down DC/DC Controller with 100% Duty Cycle Capability

Key Features

• Wide Operating VINRange: 3.5V to 60V

• Wide VOUTRange: 0.8V to VIN

• Low Operating IQ= 40μA

• Very Low Dropout Operation: 100% Duty Cycle

• Strong High Voltage MOSFET Gate Driver

• Constant Frequency Current Mode Architecture

• Verified FMEA for Adjacent Pin Open/Short

• Selectable High Efficiency Burst Mode®Operation or Pulse-Skipping Mode at Light Loads

• Programmable Fixed Frequency: 50kHz to 850kHz

• Phase-Lockable Frequency: 75kHz to 750kHz

• Accurate Current Limit

• Programmable Soft-Start or Voltage Tracking

• Internal Soft-Start Guarantees Smooth Start-Up

• Power Good Output Voltage Monitor

• Low Shutdown IQ= 7μA

• Available in Small 12-Pin Thermally Enhanced MSOP and DFN Packages

• AEC-Q100 Qualified for Automotive Applications

Description

The LTC3864 is a robust, high voltage step-down DC/DC controller optimized for automotive and industrial applications. It drives a P-channel power MOSFET switch allowing 100% duty cycle operation. The wide input and output voltage ranges cover a multitude of applications. This device has been verified with the failure mode and effects analysis (FMEA) procedure for operation during failure conditions.The LTC3864 offers excellent light load efficiency, drawing only 40μA quiescent current in a user programmable Burst Mode operation. Its peak current mode, constant frequency PWM architecture provides for good control of switching frequency and output current limit. The switching frequency can be programmed from 50kHz to 850kHz with an external resistor and can be synchronized to an external clock from 75kHz to 750kHz.The LTC3864 offers programmable soft-start or output tracking. Safety features include overvoltage protection, overcurrent and short-circuit protection including frequency foldback and a power good output signal.The LTC3864 is available in thermally enhanced 12-Pin MSOP and 3mm × 4mm DFN packages.APPLICATIONSIndustrial and Automotive Power SuppliesTelecom Power SuppliesDistributed Power Systems