®
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.
Features
4.5V to 36V Input Voltage Range
3A Output Current
Internal N-MOSFETs
Current Mode Control
Fixed Frequency Operation : 500kHz
Adjustable Output Voltage from 0.8V to 30V
High Efficiency Up to 95%
Stable with Low ESR Ceramic Output Capacitors
Cycle-by-Cycle Current Limit
Input Under Voltage Lockout
Output Under Voltage Protection
Thermal Shutdown Protection
Adjustable Current Limit
RoHS Compliant and Halogen Free
Applications
Distributed Power Systems
Pre-Regulator for Linear Regulators
Notebook Computers
Point of Load Regulator in Distributed Power System
Digital Set-top Boxes
Personal Digital Recorders
Broadband Communications
Flat Panel TVs and Monitors
Vehicle Electronics
Ordering Information
RT7272B
Package Type
SP : SOP-8 (Exposed Pad-Option 2)
Lead Plating System
G : Green (Halogen Free and Pb Free)
Note :
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.
Simplified Application Circuit
V
IN
C
IN
VIN
BOOT
RT7272B
SW
R1
RLIM
R
L
GND
COMP
FB
C
C
R
C
R2
C
OUT
C
B
L
V
OUT
Copyright
©
2013 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
DS7272B-01 January 2013
www.richtek.com
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RICHTEK [ RICHTEK TECHNOLOGY CORPORATION ]
