RT6339
11A, 23V Synchronous Step-Down Converter with 3.3V/5V
LDO
General Description
Features
⚫ Input Voltage Range
The RT6339 family are high efficiency synchronous
step-down DC-DC converters with pseudo constant
switching frequency 500kHz and deliver up to 11A
RT6339A/B/D and RT6339AH/BH/DH: 4.5V to
23V
RT6339C/CH: 5.2V to 23V
output
current.
The
RT6339A/B/D
and
⚫ Output Voltage
RT6339AH/BH/DH operate from 4.5V to 23V input
voltage. The output voltage of RT6339A/AH/D/DH is
programmable between 0.6V to 5.5V and RT6339B/BH
is fixed to 3.3V output voltage. The input voltage of
RT6339C/CH ranges from 5.2V to 23V and the output
voltage of RT6339C/CH is fixed to 5.1V.
RT6339A/AH and RT6339D/DH: 0.6V to 5.5V
RT6339B/BH: 3.3V
RT6339C/CH: 5.1V
⚫ 11A Continuous Output Current
⚫ Stable with POSCAP and MLCC Capacitor
⚫ Fast Transient Response
The RT6339 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 17m (high-side)
and 7.5m (low-side)
By setting the voltage of the EN/MODE pin, RT6339
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, RT6339
provides the best light-load efficiency and improves the
acoustic noise with spread spectrum function.
⚫ LDO
RT6339B/BH: 3.3V/100mA
RT6339C/CH: 5V/100mA
⚫ Overcurrent Limit
RT6339A/AH: Adjustable (13A, 15A or 17A)
RT6339D/DH: Adjustable (6.5A, 16A or 25.8A)
RT6339B/BH/C/CH: 16A
RT6339 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.
⚫ Output Under-/Overvoltage Protection (UVP/OVP)
RT6339A/B/C/D: Latched Mode UVP/OVP
RT6339AH/BH/CH/DH: Hiccup Mode UVP and
Non-Latched Mode OVP
All above functions are integrated in a UQFN-23L 3x3
(FC) package.
⚫ Input Undervoltage-Lockout (UVLO)
⚫ Over-Temperature Protection (OTP)
RT6339A/B/C/D: Latched Mode OTP
RT6339AH/BH/CH/DH: Non-Latched Mode OTP
⚫ Junction Temperature Range: −40C to 125C
Copyright © 2023 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
DS6339-00
August 2023
www.richtek.com
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