General Description

The RT6318B/C is an advanced constant on-time

(ACOT® ) mode synchronous buck converter. The main

control loop of the RT6318B/C using an advanced constant

on-time (ACOT® ) mode control which provides a very fast

transient response. The RT6318B operates from 4.5V to

23V input voltage and the RT6318C operates from 5.1V

to 23V.

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 (RT6318B) and 5.1V to 23V (RT6318C)

Input Voltage Range 8A Output Current

 ACOT® Mode Performs Fast Transient Response

 ACOT® Architecture to Enable All MLCC Output

Capacitor Usage

 Fixed 750kHz (RT6318C) and 500kHz (RT6318B)

Switching Frequency

 High Efficient Internal Power MOSFET Switch-

20mΩ (High-Side) and 10mΩ (Low-Side)

 Fixed 3.3V (RT6318B) and 5V (RT6318C) LDOs

Output Supply 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)