®
RT6224A/B
3A, 18V, 500kHz ACOT
TM
Synchronous Step-Down Converter
General Description
The
RT6224A/B is a high-efficiency, monolithic
synchronous step-down DC-DC converter that can deliver
up to 3.5A output peak current from a 4.3V to 18V input
supply. The RT6224A/B 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
500kHz Switching Frequency
ACOT
TM
Control
0.6V
±
1.5% Voltage Reference
Monotonic Start-Up into Pre-Biased Outputs
Applications
Set Top Box
Portable TV
Access Point Router
DSL Modem
LCD TV
Ordering Information
RT6224A/B
Package Type
J6F : TSOT-23-6 (FC)
Lead Plating System
G : Green (Halogen Free and Pb Free)
UVP Option
H: Hiccup
PSM/PWM
A : PSM/PWM
B : Force-PWM
Note :
Richtek products are :
�½
Pin Configuration
(TOP VIEW)
SW VIN EN
6
5
2
4
3
BOOT GND FB
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.
TSOT-23-6 (FC)
�½
Simplified Application Circuit
RT6224A/B
BOOT
VIN
SW
Enable
EN
FB
V
OUT
V
IN
GND
Copyright
©
2018 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
DS6224A/B-02 August 2018
www.richtek.com
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RICHTEK [ RICHTEK TECHNOLOGY CORPORATION ]
