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The RT8287 is a synchronous step-down regulator with an internal power MOSFET. It achieves 3A 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.
Fault condition protection includes cycle-by-cycle current limiting and thermal shutdown. An adjustable soft-start reduces the stress on the input source at startup.
The RT8287 requires a minimal number of readily available external components, providing a compact solution.

Applications

  • Distributive Power Systems
  • Battery Charger
  • DSL Modems
  • Pre-Regulator for Linear Regulators
Key Spec.
RT8287
Status Active
Vin (min) (V) 4.5
Vin (max) (V) 21
Number of Outputs 1
Vout (min) (V) 0.808
Vout (max) (V) 15
Output Adj. Method Resistor
Iout (max) (A) 3
Current Limit (typ) (A) 6.5
Freq (typ) (kHz) 500
Ext Sync No
Ron_HS (typ) (mOhm) 120
Ron_LS (typ) (mOhm) 40
Iq (typ) (mA) 0.7
Features Adjustable Soft-Start;Current Mode Control;Enable Input;Force PWM;Internal Compensation;OCP;Power Good;Stable with Ceramic Capacitor;UVP
Package Type WDFN4x3-14
Features
  • 3A Output Current
  • Adjustable Soft-Start
  • 120mΩ/40mΩ Internal Power MOSFET Switch
  • Internal Compensation Minimizes External Parts Count
  • 90% Efficiency
  • Fixed 500kHz Frequency
  • Thermal Shutdown Protection
  • Cycle-by-Cycle Over Current Protection
  • Wide 4.5V to 21V Operating Input Range
  • Adjustable Output from 0.808V to 15V
  • Small 14-Lead WDFN Package
  • RoHS Compliant and Halogen Free
Datasheet
TitleLast UpdateDownload
3A, 21V 500kHz Synchronous Step-Down Converter2014/07/14
Technical Documents
TitleItem TypeLast UpdateDownload
Richtek Product Selection Guide [Jan., 2024] Selection Guide2024/01/18
Reference Design
TitleLast UpdateDownload
Richtek Load Transient Tool2022/07/25
Part NumberPackage TypePackage Qty.Free SampleBuy From Authorized Distributor
RT8287ZQWWDFN4x3-141500 Request Buy from Distributor
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