60V Low I, Dual, 2-Phase Synchronous Step-Down DC/DC Controller

The LTC3892/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 encompasses a wide range of intermediate bus voltages and battery chemistries. Output voltages up to 99% of VIN can be regulated. OPTI-LOOP® compensation 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.

Applications

* Automotive and Industrial Power Systems

* Distributed DC Power Systems

* High Voltage Battery Operated Systems

* Wide VIN Range: 4.5V to 60V (65V Abs Max)

* Wide Output Voltage Range: 0.8V ≤ VOUT ≤ 99% • VIN

* Adjustable Gate Drive Level 5V to 10V (OPTI-DRIVE)

* No External Bootstrap Diodes Required

* Low Operating IQ: 29μA (One Channel On)

* Selectable Gate Drive UVLO Thresholds

* Out-of-Phase Operation Reduces Required Input Capacitance and Power Supply Induced Noise

* Phase-Lockable Frequency: 75kHz to 850kHz