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General Description

The RT6283B is a high efficiency, current mode

synchronous step-down DC-DC converter that can deliver

up to 3A output current over a wide input voltage range

from 4.5V to 30V. The device integrates a 150mΩ high

side and a 80mΩ low side MOSFET to achieve high

conversion efficiency up to 95. The current mode control

architecture supports fast transient response and simple

compensation circuit.

A cycle-by-cycle current limit function provides protection

against shorted output and an internal soft-start eliminates

input current surge during start-up. The RT6283B provides

complete protection functions such as input under-voltage

lockout, output under-voltage protection, over-current

protection and thermal shutdown.

The RT6283B is available in the thermal enhanced SOP-8

(Exposed Pad) package.

Features

? 4.5V to 30V Input Voltage Range

? 3A Output Current

? Internal N-MOSFETs

? Current Mode Control

? Fixed Frequency Operation : 500kHz

? Adjustable Output Voltage from 0.8V to 24V

? High Efficiency Up to 95

? Stable with Low ESR Ceramic Output Capacitors

? Cycle-by-Cycle Current Limit

? Input Under-Voltage Lockout

? Output Under-Voltage Protection

? Thermal Shutdown Protection

? Adjustable Current Limit

? Power Saving Mode for High Efficiency at Light

Load

? RoHS Compliant and Halogen Free

Applications

? Distributed Power Systems

? Pre-Regulator for Linear Regulators

? Notebook Computers

? Point of Load Regulator in Distributed Power System

? Digital Set-top Boxes

? Personal Digital Recorders

? Broadband Communications

? Flat Panel TVs and Monitors

? Vehicle Electronics