®
RT6242A/B
12A, 18V, 500kHz, ACOT
TM
Synchronous Step-Down Converter
General Description
The RT6242A/B is a synchronous step-down converter
with Advanced Constant On-Time (ACOT
TM
) mode control.
The ACOT
TM
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 4.5V to 18V. The proprietary circuit
of the RT6242A/B enables to support all ceramic
capacitors. The output voltage can be adjustable between
0.7V and 8V. The soft-start is adjustable by an external
capacitor.
Features
4.5V to 18V Input Voltage Range
12A Output Current
Ω
12mΩ Internal High-Side N-MOSFET and 5.4mΩ
Ω
Internal Low-Side N-MOSFET
Advanced Constant On-Time Control
Fast Transient Response
Support All Ceramic Capacitors
Up to 95% Efficiency
Adjustable Switching Frequency from 300kHz to
700kHz
Adjustable Output Voltage from 0.7V to 8V
Adjustable Soft-Start
Pre-bias Start-Up
Adjustable Current Limit from 6A to 16A
Cycle-by-Cycle Over Current Protection
Power Good Output
Input Under-Voltage Lockout
Hiccup Mode Under-Voltage Protection
Thermal Shutdown Protection
Ordering Information
RT6242A/B
Package Type
QUF : UQFN-16JL 3x3 (U-Type) (FC)
Lead Plating System
G : Green (Halogen Free and Pb Free)
UVP Option
H : Hiccup Mode UVP
L : Latched OVP & UVP
A : PSM
B : PWM
Note :
Richtek products are :
�½
Applications
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
Industrial and Commercial Low Power Systems
Computer Peripherals
LCD Monitors and TVs
Green Electronics/Appliances
Point of Load Regulation for High-Performance DSPs,
FPGAs, and ASICs
Simplified Application Circuit
V
IN
RT6242A/B
SW
VIN
BOOT
EN Signal
Power Good
EN
FB
V
OUT
RT
PGOOD
RLIM
PVCC
SS GND
Copyright
©
2016 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
DS6242A/B-05 April 2016
www.richtek.com
1
RICHTEK [ RICHTEK TECHNOLOGY CORPORATION ]
