®
RT7285B
1.5A, 18V, 500kHz ACOT
TM
Synchronous Step-Down Converter
General Description
The RT7285B 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 4.3V to 18V. The proprietary circuit of
the RT7285B enables to support all ceramic capacitors.
The output voltage can be adjusted between 0.6V and 8V.
Features
4.3V to 18V Input Voltage Range
1.5A 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
Thermal Shutdown
Power Saving Mode for High Efficiency at Light
Load
Ordering Information
RT7285B
Package Type
J6 : TSOT-23-6
Lead Plating System
G : Green (Halogen Free and Pb Free)
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
Pin Configurations
(TOP VIEW)
SW VIN EN
6
5
4
Marking Information
0C= : Product Code
0C=DNN
DNN : Date Code
2
3
BOOT GND FB
TSOT-23-6
Simplified Application Circuit
V
IN
RT7285B
BOOT
VIN
SW
V
OUT
Enable
EN
GND
FB
Copyright
©
2018 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
DS7285B-03 March 2018
www.richtek.com
1
RICHTEK [ RICHTEK TECHNOLOGY CORPORATION ]
