RT7297C Datasheet, PDF (1/15 Pages) Richtek Technology Corporation – 3A, 18V, 800kHz Synchronous Step-Down Converter

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RT7297C
3A, 18V, 800kHz Synchronous Step-Down Converter
General Description
The RT7297C is a high efficiency, monolithic synchronous
step-down DC/DC converter that can deliver up to 3A
output current from a 4.5V to 18V input supply. The
RT7297C's current mode architecture and external
compensation allow the transient response to be
optimized over a wide input voltage range and loads.
Cycle-by-cycle current limit provides protection against
shorted outputs, and soft-start eliminates input current
surge during start-up. The RT7297C 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 RT7297C is available in
an SOP-8 (Exposed Pad) package.
Marking Information
RT7297Cx
ZSPYMDNN
RT7297CxZSP : Product Number
x : H or L
YMDNN : Date Code
Features
z ±1.5% High Accuracy Reference Voltage
z 4.5V to 18V Input Voltage Range
z 3A Output Current
z Integrated N-MOSFET Switches
z Current Mode Control
z Fixed Frequency Operation : 800kHz
z Output Adjustable from 0.8V to 12V
z Up to 95% Efficiency
z Programmable Soft-Start
z Stable with Low ESR Ceramic Output Capacitors
z Cycle-by-Cycle Current Limit
z Input Under Voltage Lockout
z Output Under Voltage Protection
z Thermal Shutdown Protection
z RoHS Compliant and Halogen Free
Applications
z Wireless AP/Router
z Set-Top-Box
z Industrial and Commercial Low Power Systems
z LCD Monitors and TVs
z Green Electronics/Appliances
z Point of Load Regulation of High-Performance DSPs
Simplified Application Circuit
V_IN
VIN
BOOT
C_IN
RT7297C
C_BOOT
L
SW
V_OUT
R_EN
EN
R1
SS
FB
C_OUT
C_SS
C_{C RC}
R2
GND
COMP
Copyright ©2012 Richtek Technology Corporation. All rights reserved.
DS7297C-01 September 2012
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
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