Automotive Dual-Phase Hybrid Step-Down Synchronous Controller with Load Current Monitor

The LTC7822-1 uses an ADI-proprietary architecture that merges a soft switching charge pump topology with a dual-phase interleaved synchronous step-down converter to provide superior efficiency and low EMI performance compared to traditional switching architectures. In a typical 48V to 12V application, up to 98.4% efficiency is attainable with the LTC7822-1.

With reduced switching losses, the hybrid converter allows higher switching frequency without sacrificing much efficiency. The proprietary dual-phase topology greatly reduces the capacitor number in the charge pump stage compared to the single-phase hybrid converters. LTC7822-1 supports both standard discrete inductors and coupled inductors.

The LTC7822-1 can be easily paralleled to provide higher output current with its accurate current sharing capability and frequency synchronization function. Current monitor provides an analog voltage reflecting the load current.

APPLICATIONS

* Automotive

* Intermediate Bus Converters

* High Current Distributed Power Systems

* Telecom, Datacom, and Storage Systems

* 98.4% Peak Efficiency in 48V to 12V Application

* 97.7% Full Load Efficiency at 1kW Output Power

* Wide VIN Range: 19V to 90V (100V ABS Max)

* Output Voltage Up to 35V

* 10V Gate Drive for Optimal Efficiency

* Output Current Monitor

* EXTVCC Input for Improved Die Temperature

* ±1.25% Output Voltage Accuracy