RT6338E/EH
8A, 23V Synchronous Step-Down Converter with 3.3V LDO
General Description
Features
⚫ Input Voltage Range
The RT6338E/EH family are high efficiency
synchronous step-down DC-DC converters with pseudo
constant switching frequency 500kHz and deliver up to
8A output current. The RT6338E/EH operate from 4.5V
to 23V input voltage. The output voltage of
RT6338E/EH is fixed to 3.36V output voltage.
RT6338E/EH: 4.5V to 23V
⚫ Output Voltage
RT6338E/EH: 3.36V
⚫ 8A Continuous Output Current
⚫ Stable with POSCAP and MLCC Capacitor
⚫ Fast Transient Response
The RT6338E/EH adopts Advanced Constant On-Time
⚫ Diode Emulation Mode (DEM) for Power Saving
⚫ Ultrasonic Mode (USM) for Avoiding Acoustic
Noise
®
(ACOT ) control architecture that provides ultra-fast
transient response and further reduces the external
®
component count. In steady states, the ACOT
⚫ Pseudo Constant Switching Frequency 500kHz in
CCM
operates at nearly constant switching frequency over
line, load and output voltage ranges and makes the EMI
filter design easier.
⚫ Internal Power MOSFET Switch 26m (high-side)
and 14m (low-side)
By setting the voltage of the EN/MODE pin,
RT6338E/EH operates either in diode emulation mode
(DEM) or ultrasonic mode (USM) at light load. The USM
maintains operation frequency above 25kHz, which
eliminates the acoustic noise. In the DEM, RT6338E/EH
provides the best light-load efficiency and improves the
acoustic noise with spread spectrum function.
⚫ LDO
RT6338E/EH: 3.3V/100mA
⚫ Overcurrent Limit
RT6338E/EH: 12A
⚫ Output Under-/Overvoltage Protection (UVP/OVP)
RT6338E: Latched Mode UVP/OVP
RT6338EH: Hiccup Mode UVP and Non-Latched
Mode OVP
RT6338E/EH provides PGOOD 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.
⚫ Input Undervoltage Lockout (UVLO)
⚫ Over-Temperature Protection (OTP)
RT6338E: Latched Mode OTP
RT6338EH: Non-Latched Mode OTP
All above functions are integrated in a UQFN-23L 3x3
(FC) package.
Applications
⚫ Laptop Computers
⚫ Tablet PCs
⚫ Networking Systems
⚫ Servers
⚫ Personal Video Recorders
⚫ Flat Panel Television and Monitors
⚫ Distributed Power Systems
Copyright © 2023 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
DS6338E_EH-00
April 2023
www.richtek.com
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