18V, 10A, 500kHz ACOT® Synchronous Step-Down Converter


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The RT6250A/B is a simple, easy-to-use, 10A synchronous step-down DC-DC converter with an input supply voltage range of 4.5V to 18V. 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 RT6250A/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 RT6250A/B operates in automatic PSM that maintains high efficiency during light load operation. The RT6250A/B operates in Forced PWM that helps meet tight voltage regulation accuracy requirements. The RT6250A/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 RT6250A/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.
RT6250A RT6250B
Status Active Active
Vin (min) (V) 4.5 4.5
Vin (max) (V) 18 18
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;Fast Transient Response;OCP;OVP;PSM;Power Good;UVP;Ultrasonic Mode Control ACOT Control;Adjustable Current Limit;Fast Transient Response;Force PWM;OCP;OVP;Power Good;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 18V
  • Output Voltage Range : 0.6V to 6V
  • Advanced Constant On-Time (ACOTTM) 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) (RT6250A)
    ► Forced PWM Mode (RT6250B)
  • 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 RT6250A
  • Available in UQFN-12HL 3x3 (FC) Package
TitleLast UpdateShareDownload
18V, 10A, 500kHz ACOT® Synchronous Step-Down Converter2017/11/01
Evaluation Boards
TitleLast UpdateShareDownload
RT6250BHGQUF Step-Down Converter Evaluation Board2018/11/08
Reference Design
TitleLast UpdateShareDownload
Richtek Load Transient Tool2019/01/09
Part NumberPackage TypePackage Qty.Free SampleBuy From Authorized Distributor
RT6250BHGQUFUQFN3x3-12H(FC)1500 Request Buy from Distributor