3A, 24V, 500kHz Synchronous Step-Down Converter


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The RT8299 is a high efficiency, monolithic synchronous step-down DC/DC converter with internal power MOSFETs. It achieves 3A of continuous output current over a wide input supply range from 3V to 24V with excellent load and line regulation. Current mode operation provides fast transient response and eases loop stabilization. Cycle-by-cycle current limit provides protection against shorted outputs and soft-start eliminates input current surge during start-up. Thermal shutdown provides reliable, fault tolerant operation. The low current shutdown mode provides output disconnection, enabling easy power management in battery powered systems.


  • Industrial and Commercial Low Power Systems
  • Computer Peripherals
  • LCD Monitors and TVs
  • Green Electronics/Appliances
  • Point of Load Regulation for High Performance DSPs, FPGAs, and ASICs
Key Spec.
Status Active
Vin (min) (V) 3
Vin (max) (V) 24
Number of Outputs 1
Vout (min) (V) 0.8
Vout (max) (V) 15
Output Adj. Method Resistor
Iout (max) (A) 3
Current Limit (typ) (A) 5.5
Freq (typ) (kHz) 500
Ext Sync No
Ron_HS (typ) (mOhm) 100
Ron_LS (typ) (mOhm) 100
Iq (typ) (mA) 1
Features Current Mode Control;Cycle-by-Cycle Current Limit;Enable Input;Fast Transient Response;Force PWM;Internal Compensation;OCP;OTP;Power Good;Stable with Ceramic Capacitor;UVP
Package Type PSOP-8;WDFN3x3-10
  • 3V to 24V Input Voltage Range
  • 3A Output Current
  • Internal N-MOSFETs
  • Current Mode Control
  • Fixed Frequency Operation : 500kHz
  • Output Adjustable from 0.8V to 15V
  • Up to 95% Efficiency
  • Stable with Low ESR Ceramic Output Capacitors
  • Cycle-by-Cycle Over Current Protection
  • Input Under Voltage Lockout
  • Output Under Voltage Protection
  • Thermal Shutdown Protection
  • SOP-8 (Exposed Pad) and 10-Lead WDFN Packages
  • RoHS Compliant and Halogen Free
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3A, 24V, 500kHz Synchronous Step-Down Converter2011/06/09
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3A, 24V, 500kHz Synchronous Step-Down Converter 2015/05/19
Technical Documents
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Richtek Selection Guide (Oct., 2021)2021/11/23
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How to estimate control loop bandwidth from the transient response time?2017/03/30 1523
Reference Design
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Richtek Load Transient Tool2021/01/21