General Description

The RT6202A/B is a synchronous step-down DC/DC

converter with Advanced Constant On-Time (ACOT®) mode

control. It achieves high power density to deliver up to 5A

output current from a 4.5V to 18V input supply. The

proprietary ACOT® mode offers an optimal transient

response over a wide range of loads and all kinds of ceramic

capacitors, which allows the device to adopt very low ESR

output capacitor for ensuring performance stabilization. In

addition, RT6202A/B keeps an excellent constant

switching frequency under line and load variation and the

integrated synchronous power switches with the ACOT®

mode operation provides high efficiency in whole output

current load range. Cycle-by-cycle current limit provides

an accurate protection by a valley detection of low side

MOSFET and external soft-start setting eliminates input

current surge during startup. Protection functions include

thermal shutdown for RT6202A/B.

The RT6202A/B are available in the SOP-8 (Exposed Pad)

package.

Features

 ACOT® Mode Enables Fast Transient Response

 4.5V to 18V Input Voltage Range

 5A Output Current

 35mΩ Internal Low Side N-MOSFET

 Advanced Constant On-Time Control

 Support All Ceramic Capacitors

 Up to 95 Efficiency

 650kHz Switching Frequency at all Load Current

(RT6202B)

 Discontinuous Operating Mode at Light Load

(RT6202A)

 Adjustable Output Voltage from 0.765V to 8V

 Adjustable Soft-Start

 Cycle-by-Cycle Current Limit

 Input Under Voltage Lockout

 Thermal Shutdown

 RoHS Compliant and Halogen Free

Applications

 Industrial and Commercial Low Power Systems

 Computer Peripherals

 LCD Monitors and TVs

 Green Electronics/Appliances

 Point of Load Regulation for High-Performance DSPs,

FPGAs, and ASICs