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