General Description

The RT6226A/B/C is an advanced constant on-time

(ACOTTM) mode synchronous buck converter. The main

control loop of the RT6226A/B/C using an advanced

constant on-time (ACOTTM) mode control which provides

a very fast transient response. The RT6226A/B operates

from 4.5V to 23V input voltage and the RT6226C operates

from 5.1V to 23V. For the RT6226A, the output voltage

can be programmed between 0.6V to 5.1V.

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

Features

 4.5V to 23V (RT6226A/B) and 5.1V to 23V (RT6226C)

Input Voltage Range 6A Output Current

 ACOTTM Mode Performs Fast Transient Response

 ACOTTM Architecture to Enable All MLCC Output

Capacitor Usage

 Fixed 750kHz (RT6226C) and 500kHz (RT6226A/B)

Switching Frequency

 High Efficient Internal Power MOSFET Switch-

30mΩ (High-Side) and 15mΩ (Low-Side)

 Adjustable Output Voltage from 0.6V to 5.1V

(RT6226A)

 Fixed 3.3V (RT6226C) LDO Output Supplies 100mA

 Pre-biased Soft-Start

 Cycle-by-Cycle Over-Current Protection

 Input Under-Voltage Lockout

 Thermal Shutdown Protection

 Output Over/Under-Voltage Protection

 Ultrasonic Mode (USM)

 300kHz CLK for External Charge Bump