LTC3895

LTC3895 150V Low IQ, Synchronous Step-Down DC/DC Controller Features nn Wide VIN Range: 4V to 140V (150V Abs Max) nn Wide Output Voltage Range: 0.8V to 60V nn Adjustable Gate Drive Level: 5V to 10V (OPTI-DRIVE) nn Low Operating IQ: 40μA (Shutdown = 10μA) nn 100% Duty Cycle Operation nn No External Bootstrap Diode Required nn Selectable Gate Drive UVLO Thresholds nn Onboard LDO or External NMOS LDO for DRVCC nn EXTVCC LDO Powers Drivers from VOUT nn Phase-Lockable Frequency (75kHz to 850kHz) nn Programmable Fixed Frequency (50kHz to 900kHz) nn Selectable Continuous, Pulse-Skipping or Low Ripple Burst Mode® Operation at Light Loads nn Adjustable Burst Clamp and Current Limit nn Adjustable or Fixed (5V/3.3V) Output Voltage nn Power Good Output Voltage Monitor nn Programmable Input Overvoltage Lockout nn 38-Lead TSSOP High Voltage Package Applications nn Automotive and Industrial Power Systems nn High Voltage Battery Operated Systems nn Telecommunications Power Systems Description The LTC®3895 is a high performance step-down switching regulator DC/DC controller that drives an all N-channel synchronous power MOSFET stage that can operate from input voltages up to 140V. A constant frequency current mode architecture allows a phase-lockable frequency of up to 850kHz. The gate drive voltage can be programmed from 5V to 10V to allow the use of logic or standard-level FETs to maximize efficiency. An integrated switch in the top gate driver eliminates the need for an external bootstra...