1.2A, 24V, 700kHz Step-Down Converter


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The RT8258 is a high voltage buck converter that can support the input voltage range from 4.5V to 24V and the output current can be up to 1.2A. Current Mode operation provides fast transient response and eases loop stabilization.
The chip also provides protection functions such as cycle-by-cycle current limiting and thermal shutdown protection. The RT8258 is available in a SOT-23-6 and TSOT-23-6 packages.


  • Distributed Power Systems
  • Battery Charger
  • Pre-Regulator for Linear Regulators
  • WLED Drivers
Key Spec.
Status Active
Vin (min) (V) 4.5
Vin (max) (V) 24
Number of Outputs 1
Vout (min) (V) 0.8
Vout (max) (V) 15
Output Adj. Method Resistor
Iout (max) (A) 1.2
Current Limit (typ) (A) 2.1
Freq (typ) (kHz) 700
Ext Sync No
Ron_HS (typ) (mOhm) 300
Iq (typ) (mA) 0.55
Features Built-in Bootstrap Switch;Current Mode Control;Cycle-by-Cycle Current Limit;Enable Input;Force PWM;Internal Compensation;OCP;Stable with Ceramic Capacitor
Package Type SOT-26;TSOT-26
  • Wide Operating Input Voltage Range : 4.5V to 24V
  • Adjustable Output Voltage Range : 0.8V to 15V
  • 1.2A Output Current
  • 0.3Ω Internal Power MOSFET Switch
  • High Efficiency up to 92%
  • 700kHz Fixed Switching Frequency
  • Stable with Low ESR Output Ceramic Capacitors
  • Thermal Shutdown
  • Cycle-By-Cycle Over Current Protection
  • RoHS Compliant and Halogen Free
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1.2A, 24V, 700kHz Step-Down Converter2009/03/12
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