®
RT7237B
2A, 18V, 1.2MHz Synchronous Step-Down Converter
General Description
Features
±1.5% High Accuracy Reference Voltage
The RT7237B 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
RT7237B's current mode architecture and external
compensation allow the transient response to be
optimized over a wide input range and loads. Cycle-bycycle current limit provides protection against shorted
outputs, and soft-start eliminates input current surge during
start-up. The RT7237B also provides under voltage
protection and thermal shutdown protection. The low
current (<3μA) shutdown mode provides output
disconnection, enabling easy power management in
battery-powered systems. The RT7237B is available in
an SOP-8 (Exposed Pad) package.
4.5V to 18V Input Voltage Range
2A Output Current
Integrated N-MOSFET Switches
Current Mode Control
Fixed Frequency Operation : 1.2MHz
Output Adjustable from 0.8V to 12V
Stable with Low ESR Ceramic Output Capacitors
Up to 95% Efficiency
Programmable Soft-Start
Cycle-by-Cycle Over Current Limit
Input Under Voltage Lockout
Output Under Voltage Protection
Thermal Shutdown Protection
RoHS Compliant and Halogen Free
Marking Information
Applications
RT7237BxGSP : Product Number
RT7237Bx
GSPYMDNN
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
x : H or L
YMDNN : Date Code
Simplified Application Circuit
BOOT
VIN
VIN
CIN
CBOOT
L
RT7237B
SW
Chip Enable
VOUT
R1
EN
SS
CSS
CC
GND
Copyright © 2012 Richtek Technology Corporation. All rights reserved.
DS7237B-01
September 2012
COUT
FB
COMP
RC
R2
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
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