LTC3894 Series

150V Low IQStep-Down DC/DC Controller with 100% Duty Cycle Capability

Catalog

150V Low IQStep-Down DC/DC Controller with 100% Duty Cycle Capability

Part	Duty Cycle (Max) [Max]	Frequency - Switching [Min]	Frequency - Switching [Max]	Output Configuration	Operating Temperature [Min]	Operating Temperature [Max]	Function	Number of Outputs	Control Features	Voltage - Supply (Vcc/Vdd) [Max]	Voltage - Supply (Vcc/Vdd) [Min]	Topology	Package / Case [x]	Package / Case	Package / Case [y]	Package / Case	Output Type	Mounting Type	Output Phases	Supplier Device Package
Analog Devices LTC3894HFE#TRPBF	100 %	50 kHz	850 kHz	Positive	-40 °C	125 ¯C	Step-Down	1	Current Limit Enable Frequency Control Power Good Soft Start	150 V	4.5 V	Buck	0.173 in	16 Leads	4.4 mm	20-TSSOP Exposed Pad	Transistor Driver	Surface Mount	1	20-TSSOP-EP
Analog Devices LTC3894IFE#PBF	100 %	50 kHz	850 kHz	Positive	-40 °C	125 ¯C	Step-Down	1	Current Limit Enable Frequency Control Power Good Soft Start	150 V	4.5 V	Buck	0.173 in	16 Leads	4.4 mm	20-TSSOP Exposed Pad	Transistor Driver	Surface Mount	1	20-TSSOP-EP
Analog Devices LTC3894HFE#PBF	100 %	50 kHz	850 kHz	Positive	-40 °C	125 ¯C	Step-Down	1	Current Limit Enable Frequency Control Power Good Soft Start	150 V	4.5 V	Buck	0.173 in	16 Leads	4.4 mm	20-TSSOP Exposed Pad	Transistor Driver	Surface Mount	1	20-TSSOP-EP

Catalog

150V Low IQStep-Down DC/DC Controller with 100% Duty Cycle Capability

Key Features

• Wide Operating VINRange: 4.5V to 150V

• Wide VOUTRange: 0.8V to 60V

• 9μA IQwhen Regulating 48VINto 3.3VOUT

• 16μA IQwhen Regulating 12VINto 3.3VOUT

• Very Low Dropout Operation: 100% Duty Cycle

• Adjustable Input Overvoltage Lockout

• Programmable PGOOD Undervoltage Monitor

• RSENSEor Inductor DCR Current Sensing

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

• Programmable Fixed Frequency: 50kHz to 850kHz

• Phase-Lockable Frequency: 75kHz to 800kHz

• Internal Fixed Soft-Start and External Programmable Soft-Start or Voltage Tracking

• Strong MOSFET Gate Driver with Selectable Undervoltage Lockout Thresholds

• Optional External NMOS for Gate Driver Bias in High Power Applications

Description

The LTC3894 is a high voltage step-down DC/DC switching regulator controller. It drives a P-channel power MOSFET switch allowing 100% duty cycle operation. It enables a low part count, simple, and robust solution for high reliability, high voltage applications.The LTC3894 operates over a wide input voltage range from 4.5V to 150V and can regulate output voltages from 0.8V to 60V. It offers excellent light load efficiency, drawing only 9μA quiescent current while regulating the output voltage with no load. Its peak current mode, constant frequency 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 800kHz.The LTC3894 offers programmable output voltage soft-start or tracking. Safety features include overvoltage, overcurrent and overtemperature protection with a power good output monitor with adjustable threshold.The LTC3894 is available in a thermally enhanced 20-Pin TSSOP package with leads removed to accommodate high voltage creepage and clearance requirements.ApplicationsAutomotive and Industrial Power SystemsTelecommunication Power SystemsDistributed Power Systems