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

RT8258

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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.

Applications

  • Distributed Power Systems
  • Battery Charger
  • Pre-Regulator for Linear Regulators
  • WLED Drivers
Key Spec.
RT8258
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 Current Mode Control;Enable Input;Force PWM;Internal Compensation;OCP;Stable with Ceramic Capacitor
Package Type SOT-26;TSOT-26
Features
  • 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
Datasheet
TitleLast UpdateShareDownload
1.2A, 24V, 700kHz Step-Down Converter2009/03/12
Reliability
Title Last Update ShareDownload
1.2A, 24V, 700kHz Step-Down Converter 2015/05/19
Technical Documents
TitleLast UpdateShareDownload
Richtek Selection Guide [Oct., 2020]2020/12/30
Videos
TitleLast UpdateShareViews
How to estimate control loop bandwidth from the transient response time?2017/03/30 1359
Reference Design
TitleLast UpdateShareDownload
Richtek Load Transient Tool2021/01/21
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