®
RT6224D
3A, 18V, 1.4MHz ACOT
TM
Synchronous Step-Down Converter
General Description
The
RT6224D is a high-efficiency, monolithic synchronous
step-down DC-DC converter that can deliver up to 3A output
current from a 4.3V to 18V input supply. The RT6224D
adopts ACOT
TM
architecture to allow the transient
response to be improved and keep in constant frequency.
Cycle-by-cycle current limit provides protection against
shorted outputs and soft-start eliminates input current
surge during start-up. Fault conditions also include output
under-voltage protection, output over-voltage protection,
and thermal shutdown.
Features
Small Output Voltage at Light Load
High-Side Over-Current Limit
Integrated 90mΩ/45mΩ MOSFETs
Ω
Ω
4.3V to 18V Supply Voltage Range
1.4MHz Switching Frequency
ACOT
TM
Control
0.6V
±
1.5% Voltage Reference
Monotonic Start-Up into Pre-Biased Outputs
Applications
Ordering Information
RT6224D
Package Type
J6F : TSOT-23-6 (FC)
Lead Plating System
G : Green (Halogen Free and Pb Free)
UVP Option
H : Hiccup
PSM/PWM
D : Force-PWM
Note :
Richtek products are :
�½
Set Top Box
Portable TV
Access Point Router
DSL Modem
LCD TV
Pin Configuration
(TOP VIEW)
SW VIN EN
6
5
2
4
3
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.
BOOT GND FB
�½
TSOT-23-6 (FC)
Simplified Application Circuit
RT6224D
BOOT
SW
Enable
EN
FB
V
OUT
V
IN
VIN
GND
Copyright
©
2018 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
DS6224D-01 August 2018
www.richtek.com
1
RICHTEK [ RICHTEK TECHNOLOGY CORPORATION ]
