®
RT6219
4A, 23V, 500kHz, ACOT
TM
Synchronous Buck Converter
General Description
The RT6219 is a synchronous Buck converter with
Advanced Constant On-Time (ACOT
TM
) mode control which
provides a very fast transient response with no external
compensators. The RT6219 operates from 5V to 23V input
voltage, provides complete protection functions including
Over Current Protection(OCP), Under Voltage Protection
(UVP) and Over Voltage Protection (OVP). This IC also
provides a 1.5ms internal soft-start function and an open-
drain power good indicator.
Features
5V to 23V Input Voltage Range
Adjustable from 0.6V to 5V Output Range
Up to 98% Duty for 2S Battery Application
500kHz Switching Frequency
ACOT
TM
Mode Performs Fast Transient Response
Integrated MOSFETs
�½
67mΩ of High-Side MOSFET
Ω
�½
41mΩ of Low-Side MOSFET
Ω
Supports MLCC Output Capacitors
Internal Soft-Start (1.5ms typ)
Built-in OVP/UVP/OCP
Power Good Indicator
Thermal Shutdown
Ordering Information
RT6219
Package Type
QW : WDFN-10L 3x3 (W-Type)
Lead Plating System
G : Green (Halogen Free and Pb Free)
PWM Operation / VOUT Protection
A : with DEM/Latch
AH : with DEM/Hiccup
BL : without DEM/Latch
BH : without DEM/Hiccup
Note :
Richtek products are :
�½
Applications
Laptop Computers
Tablet PCs
Networking Systems
Servers
Personal Video Recorders
Flat Panel Television and Monitors
Distributed Power Systems
RoHS compliant and compatible with the current require-
ments of IPC/JEDEC J-STD-020.
Suitable for use in SnPb or Pb-free soldering processes.
�½
Simplified Application Circuit
V
IN
Enable
C
EN
V
SYS
R
BYP
C
BYP
PGND
VBYP
VIN
C
IN
EN
RT6219
SW
R1
FB
PGOOD
VCC
R
PGOOD
C
VCC
R2
C
OUT
BOOT
R
B
C
B
L
V
OUT
V
CC
Copyright
©
2018 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
DS6219-06 January 2018
www.richtek.com
1
RICHTEK [ RICHTEK TECHNOLOGY CORPORATION ]
