5A, 32V, 500kHz Step-Down Converter


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The RT8289 is a step-down regulator with an internal Power MOSFET. It achieves 5A of continuous output current over a wide input supply range with excellent load and line regulation. Current mode operation provides fast transient response and eases loop stabilization.

The RT8289 provides protections such as cycle-by-cycle current limiting and thermal shutdown. In shutdown mode, the regulator draws 25μA of supply current.

The RT8289 requires a minimum number of external components, to provide a compact solution.

The RT8289 is available in a SOP-8 (Exposed Pad) package.


  • Distributive Power Systems
  • LCD TV
  • DSL Modems
  • Pre-regulator for Linear Regulators
  • Battery Charger
Key Spec.
Status Active
Vin (min) (V) 5.5
Vin (max) (V) 32
Number of Outputs 1
Vout (min) (V) 1.222
Vout (max) (V) 26
Output Adj. Method Resistor
Iout (max) (A) 5
Current Limit (typ) (A) 6.8
Freq (typ) (kHz) 500
Ext Sync No
Ron_HS (typ) (mOhm) 100
Iq (typ) (mA) 0.8
Features Current Mode Control;Enable Input;Force PWM;Internal Compensation;OCP;Stable with Ceramic Capacitor;UVP
Package Type PSOP-8
  • High Output Current up to 5A
  • Internal Soft-Start
  • 100mΩ Internal Power MOSFET Switch
  • Internal Compensation Minimizes External Parts Count
  • High Efficiency up to 90%
  • 25μA Shutdown Current
  • Fixed 500kHz Frequency
  • Thermal Shutdown Protection
  • Cycle-by-Cycle Over Current Protection
  • Wide 5.5V to 32V Operating Input Range
  • Adjustable Output Voltage from 1.222V to 26V
  • Available in an SOP-8 (Exposed Pad) Package
  • RoHS Compliant and Halogen Free
TitleLast UpdateShareDownload
5A, 32V, 500kHz Step-Down Converter2009/12/02
Title Last Update ShareDownload
5A, 32V, 500kHz Step-Down Converter 2015/05/19
Technical Documents
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Richtek Wide Input Voltage Range DC/DC Power Solutions for Industrial, Automotive and LED lighting applications2019/12/12
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How to estimate control loop bandwidth from the transient response time?2017/03/30 754
Reference Design
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Richtek Load Transient Tool2019/01/09
Part NumberPackage TypePackage Qty.Free SampleBuy From Authorized Distributor
RT8289GSPPSOP-82500 Not available Buy from Distributor