RT7255
1.5A, 18V, 500kHz ACOTTM Synchronous Step-down Converter
Features
General Description
4.3V to 18V Input Voltage Range
Adjustable Soft-Start Time
PGOOD Function
The RT7255 is a synchronous step-down converter
with Advanced Constant On-Time (ACOTTM) mode
control. 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 RT7255 supports all
ceramic capacitors.
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
Hiccup Mode Under-Voltage Protection
Thermal Shutdown
The output voltage can be adjusted between 0.6V and
8V.
Ordering Information
RT7255
Package Type
V8 : SOT-23-8
Applications
Industrial and Commercial Low Power Systems
Lead Plating System
G : Green (Halogen Free and Pb Free)
Computer Peripherals
LCD Monitors and TVs
A : Hiccup + PSM
B : Non-UVP + PSM
C : Hiccup + PWM
D : Non-UVP + PWM
Green Electronics/Appliances
Point of Load Regulation for High-Performance
DSPs, FPGAs, and ASICs
Note :
Richtek products are :
RoHS compliant and compatible with the current
requirements of IPC/JEDEC J-STD-020.
Suitable for use in SnPb or Pb-free soldering processes.
Simplified Application Circuit
L
RT7255
V
OUT
V
SW
IN
VIN
C
BOOT
C
IN
BOOT
R1
R2
C
FF
C
OUT
R
PG
PGOOD
EN
5V
FB
Enable
SS
GND
C
SS
Copyright © 2015 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
DS7255-00 June 2015
www.richtek.com
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RICHTEK [ RICHTEK TECHNOLOGY CORPORATION ]
