RT7255 Datasheet, PDF (1/17 Pages) Richtek Technology Corporation – The RT7255 is a synchronous step-down

RT7255
1.5A, 18V, 500kHz ACOT^TM Synchronous Step-down Converter
General Description
The RT7255 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 RT7255 supports all
ceramic capacitors.
The output voltage can be adjusted between 0.6V and
8V.
Ordering Information
RT7255
Package Type
V8 : SOT-23-8
Lead Plating System
G : Green (Halogen Free and Pb Free)
A : Hiccup + PSM
B : Non-UVP + PSM
C : Hiccup + PWM
D : Non-UVP + PWM
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.
Features
 4.3V to 18V Input Voltage Range
 Adjustable Soft-Start Time
 PGOOD Function
 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
Applications
 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
C_IN
5V
Enable
R_PG
C_SS
RT7255
VIN
SW
BOOT
PGOOD
EN
SS
FB
GND
L
C_BOOT
C_FF ^R1
V_OUT
C_OUT
R2
Copyright © 2015 Richtek Technology Corporation. All rights reserved.
DS7255-00 June 2015
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
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