The RT5707/A is a high efficiency synchronous step-down converter featuring typ. 360nA quiescent current. It provides high efficiency at light load down to 10mA. Its input voltage range is from 2.2V to 5.5V. The RT5707 provides eight programmable output voltage 1.2V to 3.3V while delivering output current up to 600mA, peak to 1A. The RT5707A provides eight programmable output voltage 0.7V to 3.1V while delivering output current up to 400mA, peak to 0.5A.

The Hysteretic Constant-On-Time (HCOT) operation with internal compensation allow the transient response to be optimized over a wide range of loads and output capacitors.

The RT5707/A is a available in WL-CSP-8B 0.9x1.6 (BSC) package.


  • Hand-Held Devices
  • Portable Information
  • Battery Powered Equipment
  • Wearable Devices
  • Internet of Things
  • Smart Watch
Key Spec.
RT5707 RT5707A
Status Active Active
Vin (min) (V) 2.2 2.2
Vin (max) (V) 5.5 5.5
Number of Outputs 1 1
Vout (min) (V) 1.2 0.7
Vout (max) (V) 3.3 3.1
Output Adj. Method Digital Digital
Iout (max) (A) 1 0.5
Current Limit (typ) (A) 1.2 0.78
Freq (typ) (kHz) 1200 1200
Ron_HS (typ) (mOhm) 350 350
Ron_LS (typ) (mOhm) 250 250
Iq (typ) (mA) 0.00046 0.00046
Features 100% Duty Cycle;COT Control;Enable Input;Internal Compensation;OCP;OTP;PSM 100% Duty Cycle;COT Control;Enable Input;Internal Compensation;OCP;OTP;PSM
Package Type WL-CSP0.9x1.6-8(BSC) WL-CSP0.9x1.6-8(BSC)
  • Input Voltage Range : 2.2V to 5.5V
  • Programmable Output Voltage 8-Level
    ► RT5707 1.2V to 3.3V
    ► RT5707A 0.7V to 3.1V
  • Typ. 360nA Quiescent Current
  • PSM Operation
  • Up to 94% Efficiency
  • Internal Compensation
  • Output Voltage Discharge
  • Over-Current Protection
  • Over-Temperature Protection
  • Output Current
    ► RT5707 600mA, Peak to 1A
    ► RT5707A 400mA, Peak to 0.5A
  • Automatic Transition to 100% Duty Cycle Operation
TitleLast UpdateDownload
Ultra-Low Quiescent Current HCOT Buck Converter2018/03/01
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
Power Management for Video Doorbell App. Note2021/10/08
Part NumberPackage TypePackage Qty.Free SampleBuy From Authorized Distributor
RT5707AWSCWL-CSP0.9x1.6-8(BSC)3000 Request Buy from Distributor
RT5707WSCWL-CSP0.9x1.6-8(BSC)3000 Request Buy from Distributor