LTC3892 Datasheet | Linear Technology

Features nn Wide VIN Range: 4.5V to 60V (65V Abs Max) nn Wide Output Voltage Range: 0.8V ≤ VOUT ≤ 99% - VIN nn Adjustable Gate Drive Level 5V to 10V (OPTI-DRIVE) nn No External Bootstrap Diodes Required nn Low Operating IQ: 29μA (One Channel On) nn Selectable Gate Drive UVLO Thresholds nn Out-of-Phase Operation Reduces Required Input Capacitance and Power Supply Induced Noise nn Phase-Lockable Frequency: 75k Hz to 850k Hz nn Selectable Continuous, Pulse Skipping or Low Ripple Burst Mode® Operation at Light Loads nn Selectable Current Limit (LTC3892/LTC3892-2) nn Very Low Dropout Operation: 99% Duty Cycle nn Power Good Output Voltage Monitors (LTC3892/LTC3892-2) nn Low Shutdown IQ: 3.6μA nn Small 32-Lead 5mm × 5mm QFN Package (LTC3892/ LTC3892-2) or TSSOP Package (LTC3892-1) APPLICATIONS nn Automotive and Industrial Power Systems nn Distributed DC Power Systems nn High Voltage Battery Operated Systems LTC3892/ LTC3892-1/LTC3892-2 60V Low IQ, Dual, 2-Phase Synchronous Step-Down DC/DC Controller DESCRIPTION The LTC®3892/LTC3892-1/LTC3892-2 is a high performance dual step-down DC/DC switching regulator controller that drives all N-channel synchronous power MOSFET stages. Power loss and noise are minimized by operating the two controller output stages out-of-phase. The gate drive voltage can be programmed from 5V to 10V to allow the use of logic or standard-level FETs and to maximize efficiency. Internal switches in the top gate drivers eliminate the need for external bootstrap diodes. A wide 4.5V to 60V input supply range enpasses a wide range of intermediate bus voltages and battery chemistries. Output voltages up to 99% of VIN can be regulated. OPTILOOP® pensation allows the transient response and loop stability to be optimized over a wide range of output capacitance and ESR values. The 29μA no-load quiescent current extends operating run time in battery powered systems. For a parison of the LTC3892 to the LTC3892-1 and LTC3892-2, see Table 1 in the Pin...