3A, 24V, 1.2MHz Step-Down Converter


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The RT8272 is a high voltage buck converter that can support the input voltage range from 4.75V to 24V and the output current can be up to 3A. Current Mode operation provides fast transient response and eases loop stabilization.
The chip provides protection functions such as cycle-by-cycle current limiting and thermal shutdown protection. In shutdown mode, the regulator draws 25μA of supply current. The RT8272 is available in a SOP-8 (Exposed Pad) surface mount package.


  • Distributive Power Systems
  • Battery Charger
  • DSL Modems
  • Pre-regulator for Linear Regulators
Key Spec.
Status Active
Vin (min) (V) 4.75
Vin (max) (V) 24
Number of Outputs 1
Vout (min) (V) 0.92
Vout (max) (V) 15
Output Adj. Method Resistor
Iout (max) (A) 3
Current Limit (typ) (A) 4.1
Freq (typ) (kHz) 1200
Ext Sync No
Ron_HS (typ) (mOhm) 100
Iq (typ) (mA) 0.8
Features Adjustable Soft-Start;Current Mode Control;Enable Input;Force PWM;OCP;Stable with Ceramic Capacitor;UVP
Package Type PSOP-8
  • Wide Operating Input Range : 4.75V to 24V
  • Adjustable Output Voltage Range : 0.92V to 15V
  • Output Current up to 3A
  • 25μA Low Shutdown Current
  • Power MOSFET : 0.1Ω
  • High Efficiency up to 95%
  • 1.2MHz Fixed Switching Frequency
  • Stable with Low ESR Output Ceramic Capacitors
  • Thermal Shutdown Protection
  • Cycle-By-Cycle Over Current Protection
  • RoHS Compliant and Halogen Free
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3A, 24V, 1.2MHz Step-Down Converter2008/11/07
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3A, 24V, 1.2MHz Step-Down Converter 2015/05/19
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Reference Design
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