RT7272B Datasheet, PDF (1/15 Pages) Richtek Technology Corporation – 3A, 36V, 500kHz Synchronous Step-Down Converter

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RT7272B
3A, 36V, 500kHz Synchronous Step-Down Converter
General Description
The RT7272B is a high efficiency, current mode
synchronous step-down DC/DC converter that can deliver
up to 3A output current over a wide input voltage range
from 4.5V to 36V. The device integrates a 150mΩ high
side and a 80mΩ low side MOSFET to achieve high
conversion efficiency up to 95%. The current mode control
architecture supports fast transient response and simple
compensation circuit.
A cycle-by-cycle current limit function provides protection
against shorted output and an internal soft-start eliminates
input current surge during start-up. The RT7272B provides
complete protection functions such as input under voltage
lockout, output under voltage protection, over current
protection and thermal shutdown.
The RT7272B is available in the thermal enhanced SOP-8
(Exposed Pad) package.
Ordering Information
RT7272B
Package Type
SP : SOP-8 (Exposed Pad-Option 2)
Note :
Lead Plating System
G : Green (Halogen Free and Pb Free)
Richtek products are :
` RoHS compliant and compatible with the current require-
ments of IPC/JEDEC J-STD-020.
` Suitable for use in SnPb or Pb-free soldering processes.
Features
z 4.5V to 36V Input Voltage Range
z 3A Output Current
z Internal N-MOSFETs
z Current Mode Control
z Fixed Frequency Operation : 500kHz
z Adjustable Output Voltage from 0.8V to 30V
z High Efficiency Up to 95%
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 Adjustable Current Limit
z RoHS Compliant and Halogen Free
Applications
z Distributed Power Systems
z Pre-Regulator for Linear Regulators
z Notebook Computers
z Point of Load Regulator in Distributed Power System
z Digital Set-top Boxes
z Personal Digital Recorders
z Broadband Communications
z Flat Panel TVs and Monitors
z Vehicle Electronics
Simplified Application Circuit
V_IN
C_IN
VIN
BOOT
RT7272B
SW
C_{B L}
RLIM
FB
R_L
C_{C RC}
GND
COMP
V_OUT
R1
C_OUT
R2
Copyright ©2013 Richtek Technology Corporation. All rights reserved.
DS7272B-01 January 2013
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
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