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