LTC3895 Datasheet | Linear Technology

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 (75k Hz to 850k Hz) nn Programmable Fixed Frequency (50k Hz to 900k Hz) 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 Telemunications 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 850k Hz. 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 bootstrap diode. An internal charge pump allows for 100% duty cycle operation. The low 40μA no-load quiescent current extends operating run time in battery-powered systems. OPTI-LOOP® pensation allows the transient response to be optimized over a wide range of output capacitance and ESR values. The LTC3895 Features a precision 0.8V reference and power good output indicator. The output voltage can be programmed between 0.8V to 60V using external resistors or pin-programmed for a fixed 5V or 3.3V. L,...