Richtek RT7247A, Manual

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RT7247A
®
DS7247A-03 October 2016 www.richtek.com
1
Copyright 2016 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation. ©
Design
Tools Sample &
Buy
Applications

Wireless AP/Router

Set-Top-Box

Industrial and Commercial Low Power Systems

LCD Monitors and TVs

Green Electronics/Appliances

Point of Load Regulation of High-Performance DSPs
2A, 18V, 340kHz Synchronous Step-Down Converter
General Description
The RT7247A is a high efficiency, monolithic synchronous
step-down DC/DC converter that can deliver up to 2A
output current from a 4.5V to 18V input supply. The
RT7247A's current mode architecture and external
compensation allow the transient response to be
optimized over a wide input range and loads. Cycle-by-
cycle current limit provides protection against shorted
outputs, and soft-start eliminates input current surge during
start-up. The RT7247A also provides under voltage
protection and thermal shutdown protection. The low
current (<3
μ
A) shutdown mode provides output
disconnection, enabling easy power management in
battery-powered systems. The RT7247A is available in
an SOP-8 (Exposed Pad) package.
Features
    
±±±±±
1.5% High Accuracy Reference Voltage
    
4.5V to 18V Input Voltage Range
    
2A Output Current
    
Integrated N-MOSFET Switches
    
Current Mode Control
 
  
Fixed Frequency Operation : 340kHz
    
Output Adjustable from 0.8V to 15V
    
Stable with Low ESR Ceramic Output Capacitors
    
Up to 95% Efficiency
    
Programmable Soft-Start
    
Cycle-by-Cycle Over Current Protection
 
  
Input Under Voltage Lockout
    
Output Under Voltage Protection
    
Thermal Shutdown Protection
    
RoHS Compliant and Halogen Free
Marking Information
RT7247Ax
GSPYMDNN
RT7247AxGSP : Product Number
x : H or L or N
YMDNN : Date Code
Simplified Application Circuit
VIN
EN
GND
BOOT
FB
SW
L
R1
R2
V
OUT
V
IN
RT7247A
SS
C
SS
COMP
C
C
R
C
C
P
C
BOOT
C
IN
C
OUT
Chip Enable