General Description

The RT8287A is a synchronous step-down regulator with an internal power MOSFET. It achieves 4A of continuous output current over a wide input supply range with excellent load and line regulation. Current mode operation provides fast transient response and eases loop stabilization.

Fault condition protection includes cycle-by-cycle current limiting and thermal shutdown. An adjustable soft-start reduces the stress on the input source at startup.

The RT8287A requires a minimal number of readily available external components, providing a compact solution.

Features

• 4A Output Current

• Adjustable Soft-Start

• 120mΩ/40mΩ Internal Power MOSFET Switch

• Internal Compensation Minimizes External Parts Count

• Fixed 500kHz Frequency

• Thermal Shutdown Protection

• Cycle-by-Cycle Over Current Protection

• Wide 4.5V to 21V Operating Input Range

• Adjustable Output from 0.808V to 15V

• Small 14-Lead WDFN Package

• RoHS Compliant and Halogen Free

Applications

• Distributive Power Systems

• Battery Charger

• DSL Modems

• Pre-Regulator for Linear Regulators