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3A, 36V, 500kHz Synchronous Step-Down Converter

RT7272B

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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.

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
  • Networked Communication
Key Spec.
RT7272B
Status Active
Vin (min) (V) 4.5
Vin (max) (V) 36
Number of Outputs 1
Vout (min) (V) 0.8
Vout (max) (V) 30
Output Adj. Method Resistor
Iout (max) (A) 3
Current Limit (typ) (A) 5.5
Freq (typ) (kHz) 500
Ext Sync No
Ron_HS (typ) (mOhm) 150
Ron_LS (typ) (mOhm) 80
Iq (typ) (mA) 0.9
Features Adjustable Current Limit;Current Mode Control;Enable Input;OCP;PSM;Stable with Ceramic Capacitor;UVP
Package Type PSOP-8
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
  • Power Saving Mode for High Efficiency at Light Load
  • RoHS Compliant and Halogen Free
Datasheet
TitleLast UpdateShareDownload
3A, 36V, 500kHz Synchronous Step-Down Converter2013/03/29
Technical Documents
TitleLast UpdateShareDownload
DC/DC Converter Testing with Fast Load Transient2019/06/04
Automotive Product Selection Guide2018/11/15
Richtek Wide Input Voltage Range DC/DC Power Solutions for Industrial, Automotive and LED lighting applications2018/11/01
Videos
TitleLast UpdateShareViews
How to estimate control loop bandwidth from the transient response time?2017/03/30 620
Evaluation Boards
TitleLast UpdateShareDownload
RT7272BGSP Evaluation Board2019/09/16
Reference Design
TitleLast UpdateShareDownload
Richtek Load Transient Tool2019/01/09
Design Tool
TitleLast UpdateShare
Richtek Designer™ Web Simulation Tool : RT7272BGSP2019/09/11
Part NumberPackage TypePackage Qty.Free SampleBuy From Authorized Distributor
RT7272BGSPPSOP-82500 Request Buy from Distributor
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