RT6338 Datasheet | Richtek

Description The RT6338 family is high efficiency synchronous buck converters with pseudo constant switching frequency 500k Hz and delivers up to 8A output current. The RT6338A/B/F and RT6338AH/BH/FH operate from 4.5V to 23V input voltage. The output voltage of the RT6338A/AH/F/FH is programmed between 0.6V to 5.5V and RT6338B/BH is fixed to 3.3V output voltage. The input voltage of RT6338C/CH ranges from 5.2V to 23V and the output voltage of RT6338C/CH is fixed to 5.1V. The RT6338 adopts Advanced Constant On-Time (ACOT® ) control architecture that provides ultra-fast transient response and further reduces the external ponent count. In steady states, the ACOT® operates at nearly constant switching frequency over line, load and output voltage ranges and makes the EMI filter design easier. By setting the voltage of the EN/MODE pin, the RT6338 operates either in diode emulation mode (DEM) or ultrasonic mode (USM) at light load. The USM maintains operation frequency above 25k Hz, which eliminates the acoustic noise. In the DEM, the RT6338 provides the best light-load efficiency and improves the acoustic noise with spread spectrum function. The RT6338 provides a PG indicator for easy system sequence control. Full protection features are also integrated in the device, including the cycle-by-cycle current limit, OVP, UVP, input UVLO, and OTP. All above functions are integrated in a UQFN-23L 3x3 (FC) package. The remended junction temperature is - 40C to 125C. 2 Applications - Laptop puters - Tablet PCs - Networking Systems - Servers - Personal Video Recorders - Flat Panel Television and Monitors - Distributed Power Systems Copyright © 2026 Richtek Technology Corporation. All rights reserved. RT6338_DS-06 February 2026 3 Features - Input Voltage Range: - RT6338A/B/F and RT6338AH/BH/FH: 4.5V to 23V - RT6338C/CH: 5.2V to 23V - Output Voltage: - RT6338A/AH/F/FH: 0.6V to 5.5V - RT6338B/BH: 3.3V - RT6338C/CH: 5.1V - 8A Continuous Output Current - Stable with POSCAP and MLCC...