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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 RT7272B integrates a 150mΩ on-resistance of high-side MOSFET and an 80mΩ on-resistance of 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 undervoltage lockout, output undervoltage protection, overcurrent protection and over-temperature protection.
The RT7272B is available in the thermal enhanced SOP-8 (Exposed Pad) package.

应用

  • 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
主要规格
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;Cycle-by-Cycle Current Limit;Enable Input;OCP;OTP;PSM;Stable with Ceramic Capacitor;UVP
Package Type PSOP-8
关键特性
  • 4.5V to 36V Input Voltage Range
  • 3A Output Current
  • Internal N-MOSFETs
  • Current Mode Control
  • Fixed Switching 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 Undervoltage Lockout
  • Output Undervoltage Protection
  • Over-Temperature Protection
  • Adjustable Current Limit
  • Power Saving Mode for High Efficiency at Light Load
Evaluation Boards
TitleLast UpdateDownload
RT7272BGSP Evaluation Board2015/05/15
Reference Design
TitleLast UpdateDownload
立锜负载瞬变测试工具2018/11/01
Part NumberPackage TypePackage Qty.Free SampleDistributorStockBuy From Authorized Distributor
RT7272BGSPPSOP-82,500 Request Digikey 4,949 Buy
Mouser Lead-Time: 14 weeks Not Available
WPG Lead-Time: 14 weeks Not Available
Evaluation Board
Part NumberDistributorStockBuy From Authorized Distributor
EVB_RT7272BGSP Digikey Lead-Time: 14 weeks Not Available
Mouser Lead-Time: 14 weeks Not Available
WPG Lead-Time: 14 weeks Not Available
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