6V, 1A, 1.5MHz, CMCOT Synchronous Step-Down Converter


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The RT5710B is a simple, easy-to-use, 1A synchronous step-down DC-DC converter with an input supply voltage range of 2.5V 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 WDFN-6L 2x2 package.

The RT5710B 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 RT5710B operates in Forced PWM that helps meet tight voltage regulation accuracy requirements.

The RT5710B 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 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. The RT5710B is offered in a WDFN-6L 2x2 package.


  • STB, Cable Modem, & xDSL Platforms
  • LCD TV Power Supply & Metering Platforms
  • General Purpose Point of Load (POL)
  • Internet of Things
Key Spec.
Status Active
Vin (min) (V) 2.5
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) 1
Current Limit (typ) (A) 1.5
Freq (typ) (kHz) 1500
Ext Sync No
Ron_HS (typ) (mOhm) 160
Ron_LS (typ) (mOhm) 110
Iq (typ) (mA) 0.3
Features Cycle-by-Cycle Current Limit;Enable Input;Fast Transient Response;Force PWM;Internal Compensation;OCP;UVP
Package Type WDFN2x2-6
  • 1A Converter With Built-In 160mΩ/110mΩ Low RDS(ON) Power FETs
  • Input Supply Voltage Range : 2.5V 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
  • 0.6 ±2% High-Accuracy Feedback Reference Voltage
  • LS FETs Protection for Robust Over-Current Protection
  • Forced PWM Mode
  • Fixed Switching Frequency : 1.5MHz
  • Internally Soft-Start Function
  • Monotonic Start-Up for Pre-Biased Output
  • Input Under-Voltage Lockout (UVLO)
  • Output Under-Voltage Protection (UVP) with Hiccup Mode
  • Enable Control
  • Available In WDFN-6L 2x2 Package
TitleLast UpdateShareDownload
6V, 1A, 1.5MHz, CMCOT Synchronous Step-Down Converter2015/06/04
Technical Documents
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Richtek Selection Guide [Oct., 2020]2020/12/30
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How to estimate control loop bandwidth from the transient response time?2017/03/30 1363
Design Tool
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Richtek Designer™ Web Simulation Tool : RT5710BHGQW2020/09/23
Part NumberPackage TypePackage Qty.Free SampleBuy From Authorized Distributor
RT5710BHGQWWDFN2x2-62500 Not available Buy from Distributor