®
RT6222A/B
2.5A, 18V, 500kHzACOTTMSynchronousStep-Down Converter
General Description
Features
4.3V to 18V Input Voltage Range
The RT6222A/B is a synchronous step-down converter
withAdvanced Constant On-Time (ACOTTM) control mode.
The ACOTTM provides a very fast transient response with
few external components. The low impedance internal
MOSFET supports high efficiency operation with wide input
voltage range from 4.3V to 18V. The proprietary circuit of
the RT6222A/B enables to support all ceramic capacitors.
The output voltage can be adjusted between 0.6V and 8V.
2.5A Output Current
Advanced Constant On-Time Control
Fast Transient Response
Support All Ceramic Capacitors
Up to 95% Efficiency
500kHz Switching Frequency
Adjustable Output Voltage from 0.6V to 8V
Cycle-by-Cycle Current Limit
Input Under-Voltage Lockout
Hiccup Mode Under-Voltage Protection
Thermal Shutdown
Ordering Information
RT6222A/B
Package Type
J6F : TSOT-23-6 (FC)
Power Saving Mode for High Efficiency at Light
Load
Lead Plating System
G : Green (Halogen Free and Pb Free)
Low Output Voltage Ripple at Light Load
High Side Over Current Limit
RoHS Compliant and Halogen Free
UVP Option
H: Hiccup
PSM/PWM
A : PSM/PWM
B : Force-PWM
Applications
Industrial and Commercial Low Power Systems
Note :
Computer Peripherals
Richtek products are :
LCDMonitors and TVs
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.
Green Electronics/Appliances
Point of Load Regulation for High-PerformanceDSPs,
FPGAs, and ASICs
Simplified Application Circuit
RT6222A/B
BOOT
V
IN
VIN
V
SW
FB
OUT
Enable
EN
GND
Copyright 2015 Richtek Technology Corporation. All rights reserved.
©
is a registered trademark of Richtek Technology Corporation.
DS6222A/B-00 October 2015
www.richtek.com
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