The RT5752A/B is a simple, easy-to-use, 2A synchronous step-down DC-DC converter with an input supply voltage range from 2.5V to 6V. The device builds in an accurate 0.6V reference voltage and integrates low RDS(ON) power MOSFETs to achieve high efficiency in TSOT-23-5, TSOT-23-6 and WDFN-6L 2x2 packages.

The RT5752A/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 RT5752A operates in automatic PSM that maintains high efficiency during light load operation. The RT5752B operates in Forced PWM that helps to meet tight voltage regulation accuracy requirements.

The RT5752A/B senses both FETs current for a robust over-current protection. The device features cycle-by-cycle current limit protection which prevents 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 (RT5752AL/BL) and over-temperature protection to provide safe and smooth operation in all operating conditions.


  • Mobile Phones and Handheld Devices
  • STB, Cable Modem, and xDSL Platforms
  • WLAN ASIC Power / Storage (SSD and HDD)
  • General Purpose for POL LV Buck Converters
Key Spec.
RT5752A RT5752B
Status Active Active
Vin (min) (V) 2.5 2.5
Vin (max) (V) 5.5 5.5
Number of Outputs 1 1
Vout (min) (V) 0.6 0.6
Vout (max) (V) 5.5 5.5
Output Adj. Method Resistor Resistor
Iout (max) (A) 2 2
Current Limit (typ) (A) 2.3 2.3
Freq (typ) (kHz) 1200 1200
Ext Sync No No
Ron_HS (typ) (mOhm) 100 100
Ron_LS (typ) (mOhm) 70 70
Iq (typ) (mA) 0.023 0.023
Features 100% Duty Cycle;ACOT Control;COT Control;Cycle-by-Cycle Current Limit;Enable Input;Fast Transient Response;OCP;OTP;OVP;PSM;Power Good;SCP;Stable with Ceramic Capacitor;UVP 100% Duty Cycle;ACOT Control;COT Control;Cycle-by-Cycle Current Limit;Enable Input;Fast Transient Response;OCP;OTP;OVP;Power Good;SCP;Stable with Ceramic Capacitor;UVP
Package Type TSOT-25;TSOT-26;WDFN2x2-6 TSOT-25;TSOT-26;WDFN2x2-6
  • Input Voltage Range from 2.5V to 6V
  • Integrated 100mΩ and 70mΩ FETs
  • 100% Duty Cycle for Lowest Dropout
  • Internal Reference Voltage with 1% Accuracy
  • 1.2MHz Typical Switching Frequency
  • Power Saving Mode for Light Loads (RT5752A)
  • Advanced Constant On-Time (ACOT® ) Control
  • Internal Soft Startup (1.5ms)
  • Enable Control Input
  • Power Good Indicator
  • Negative Over-Current Protection (RT5752B)
  • Fully Protection with UVLO, OVP, UVP, Cycle-by-Cycle Current Limit and OTP
  • RoHS Compliant and Halogen Free
TitleLast UpdateDownload
2A, 1.2MHz, 6V Synchronous Step-Down Converter inTSOT-23-5/TSOT-23-6 and WDFN-6L 2x22020/08/19
Reference Design
TitleLast UpdateDownload
Richtek Load Transient Tool2022/07/25
Part NumberPackage TypePackage Qty.Free SampleBuy From Authorized Distributor
RT5752AHGJ5TSOT-253000 Request Buy from Distributor
RT5752AHGJ6TSOT-263000 Request Buy from Distributor
RT5752ALGJ6TSOT-263000 Request Buy from Distributor
RT5752BHGJ5TSOT-253000 Request Buy from Distributor
RT5752BHGJ6TSOT-263000 Request Buy from Distributor
RT5752BHGQWWDFN2x2-62500 Request Buy from Distributor