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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