General Description

The RT8283B is a high-efficiency, monolithic synchronous step-down DC/DC converter that can deliver up to 3A output current from a 4.5V to 23V input supply. The RT8283Bs current mode architecture and external compensation allow the transient response to be optimized over a wide range of loads and output capacitors. Cycle-by-cycle current limit provides protection against shorted outputs and soft-start eliminates input current surge during start-up. The RT8283B provides output under voltage protection and thermal shutdown protection. The low current (

Features

• ±1.5 High Accuracy Feedback Voltage

• 4.5V to 23V Input Voltage Range

• 3A Output Current

• Integrated N-MOSFET Switches

• Current Mode Control

• Fixed Frequency Operation : 1.2MHz

• Adjustable Output from 0.8V to 20V

• Up to 95 Efficiency

• Programmable Soft-Start

• Stable with Low-ESR Ceramic Output Capacitors

• Cycle-by-Cycle Over Current Protection

• Input Under Voltage Lockout

• Output Under Voltage Protection

• Thermal Shutdown Protection

• RoHS Compliant and Halogen Free

Applications

• Wireless AP/Router

• Set-Top-Box

• Industrial and Commercial Low Power Systems

• LCD Monitors and TVs

• Green Electronics/Appliances

• Point of Load Regulation of High-Performance DSPs