The RT6280A/B is a simple, easy-to-use, 10A synchronous step-down DC-DC converter with an input supply voltage range of 4.5V to 23V. The device build-in an accurate 0.6V reference voltage and integrates low RDS(ON) power MOSFETs to achieve high efficiency in a UQFN-12HL 3x3 package. The RT6280A/B adopts Advanced Constant On-Time (ACOT®) control architecture to provide an ultrafast transient response with few external components and to operate in nearly constant switching frequency over the line, load, and output voltage range. The RT6280A/B operates in automatic PSM that maintains high efficiency during light load operation. The RT6280A/B operates in Forced PWM that helps meet tight voltage regulation accuracy requirements. The RT6280A/B senses both FETs current for a robust over-current protection. It features cycle-by-cycle current limit protection and prevent the device from the catastrophic damage in output short circuit, over current or inductor saturation. A built-in soft-start function prevents inrush current during start-up. The device also includes input under-voltage lockout, output under-voltage protection, over-voltage protection, and over-temperature protection (thermal shutdown) to provide safe and smooth operation in all operating conditions. The RT6280A/B is offered in a UQFN-12HL 3x3 (FC) package.


  • 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
  • Networking Communication
Key Spec.
RT6280A RT6280B
Status Preview Active
Vin (min) (V) 4.5 4.5
Vin (max) (V) 23 23
Number of Outputs 1 1
Vout (min) (V) 0.6 0.6
Vout (max) (V) 6 6
Output Adj. Method Resistor Resistor
Iout (max) (A) 10 10
Current Limit (typ) (A) 10;12;8 10;12;8
Freq (typ) (kHz) 500 500
Ext Sync No No
Ron_HS (typ) (mOhm) 20 20
Ron_LS (typ) (mOhm) 10 10
Iq (typ) (mA) 0.13 0.13
Features ACOT Control;Adjustable Current Limit;Cycle-by-Cycle Current Limit;Enable Input;Fast Transient Response;Force PWM;OCP;OTP;OVP;PSM;Power Good;Stable with Ceramic Capacitor;UVP;Ultrasonic Mode Control ACOT Control;Adjustable Current Limit;Cycle-by-Cycle Current Limit;Enable Input;Fast Transient Response;Force PWM;OCP;OTP;OVP;Power Good;Stable with Ceramic Capacitor;UVP
Package Type UQFN3x3-12H(FC) UQFN3x3-12H(FC)
  • 10A Converter With Built-in 20mΩ/10mΩ Low RDS(ON) Power FETs
  • Input Supply Voltage Range : 4.5V to 23V
  • Output Voltage Range : 0.6V to 6V
  • Advanced Constant On-Time (ACOT®) Control
    ► Ultrafast Transient Response
    ► No Needs for External Compensations
    ► Optimized for Low-ESR Ceramic Output Capacitors
  • 0.6V ±1% High-Accuracy Feedback Reference Voltage
  • Optional for Operation Modes :
    ► Power Saving Mode (PSM) (RT6280A)
    ► Forced PWM Mode (RT6280B)
  • Fixed Switching Frequency : 500kHz
  • Built-in Internally Fixed Soft-Start (Typ. 0.4ms)
  • Input Under-Voltage Lockout (UVLO)
  • Output Under-Voltage Protection (UVP) with Hiccup Mode
  • Output Over-Voltage Protection (OVP) with Auto-Recovery Mode
  • Ultrasonic Mode (USM) for RT6280A
  • Available in UQFN-12HL 3x3 (FC) Package
TitleLast UpdateDownload
23V, 10A, 500kHz ACOT® Synchronous Step-Down Converter2018/10/08
Technical Documents
TitleItem TypeLast UpdateDownload
Richtek Product Selection Guide [Jan., 2024] Selection Guide2024/01/18
Richtek Featured Product Tree [Aug., 2023] Selection Guide2023/08/07
Reference Design
TitleLast UpdateDownload
Richtek Load Transient Tool2022/07/25