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)