6V, 2.5A, 1MHz, CMCOT Synchronous Step-Down Converter


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The RT8098D is a simple, easy-to-use, 2.5A synchronous step-down DC-DC converter with an input supply voltage range of 2.7V to 6V. The device build-in an accurate 0.6V reference voltage and integrates low RDS(ON) power MOSFETs to achieve high efficiency in a SOT-23-6 package.

The RT8098D adopts Current Mode Constant On-Time (CMCOT) 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 RT8098D operates in Forced PWM that helps meet tight voltage regulation accuracy requirements.

The RT8098D senses low-side 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. An internally adjustable soft-start function prevents inrush current during start-up. The device also includes input under-voltage lockout, output under-voltage protection, and over-temperature protection (thermal shutdown) to provide safe and smooth operation in all operating conditions. TheRT8098D is offered in a SOT-23-6 package.


  • STB, Cable Modem, & xDSL Platforms
  • LCD TV Power Supply & Metering Platforms
  • General Purpose Point of Load (POL)
Key Spec.
Status Active
Vin (min) (V) 2.7
Vin (max) (V) 6
Number of Outputs 1
Vout (min) (V) 0.6
Vout (max) (V) 3.4
Output Adj. Method Resistor
Iout (max) (A) 2.5
Current Limit (typ) (A) 3.5
Freq (typ) (kHz) 1000
Ext Sync No
Ron_HS (typ) (mOhm) 100
Ron_LS (typ) (mOhm) 70
Iq (typ) (mA) 0.3
Features Cycle-by-Cycle Current Limit;Enable Input;Force PWM;Internal Compensation;OCP;OTP;OVP;Power Good;Stable with Ceramic Capacitor;UVP
Package Type SOT-26
  • Efficiency Up to 95%
  • 2.5A Converter With Built-In 100mΩ/70mΩ Low RDS(ON) Power FETs
  • Input Supply Voltage Range : 2.7V to 6V
  • Output Voltage Range : 0.6V to 3.4V
  • Current Mode Constant On-Time (CMCOT) Control
  • Ultrafast Transient Response
  • No Needs For External Compensations
  • Optimized for Low-ESR Ceramic Output Capacitors
  • 0.6V ±2% High-Accuracy Feedback Reference Voltage
  • LS FETs Protection for Robust Over-Current Protection
  • Forced PWM Mode
  • Fixed Switching Frequency : 1MHz
  • Internally Soft-Start Function
  • Monotonic Start-Up for Pre-Biased Output
  • Input Under-Voltage Lockout (UVLO)
  • Output Under-Voltage Protection (UVP) with Hiccup Mode
  • Power Good Indication
  • Enable Control
  • Available In SOT-23-6 Package
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6V, 2.5A, 1MHz, CMCOT Synchronous Step-Down Converter2017/11/24
Technical Documents
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Richtek Selection Guide [Oct., 2020]2020/12/30
Reference Design
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Richtek Load Transient Tool2021/01/21
Design Tool
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Richtek Designer™ Web Simulation Tool : RT8098DHGE2020/09/23