3A, 1.2MHz, 5.5V Synchronous Step-Down Converter In WDFN-8L 2x2

RT5753A/RT5753B Feature Product

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The RT5753A/B is a simple, easy-to-use, 3A synchronous step-down DC-DC converter with an input supply voltage range from 2.5V to 5.5V. The device builds in an accurate 0.6V reference voltage and integrates low RDS(ON) power MOSFETs to achieve high efficiency in WDFN-8L 2x2 and WDFN-8SL 2x2 packages.

The RT5753A/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 RT5753A operates in automatic PSM that maintains high efficiency during light load operation. The RT5753B operates in Forced PWM that helps to meet tight voltage regulation accuracy requirements.

The RT5753A/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 (RT5753AL/BL) and over-temperature protection to provide safe and smooth operation in all operating conditions.


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Key Spec.
RT5753A RT5753B
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) 3 3
Current Limit (typ) (A) 3.45 3.45
Freq (typ) (kHz) 1200 1200
Ext Sync No No
Ron_HS (typ) (mOhm) 100 100
Ron_LS (typ) (mOhm) 70 70
Iq (typ) (mA) 0.035 0.035
Features 100% Duty Cycle;ACOT Control;Enable Input;Fast Transient Response;OCP;OTP;OVP;PSM;Power Good;SCP 100% Duty Cycle;ACOT Control;Enable Input;Fast Transient Response;Force PWM;OCP;OTP;OVP;Power Good;SCP
Package Type WDFN2x2-8;WDFN2x2-8S WDFN2x2-8;WDFN2x2-8S
  • Input Voltage Range from 2.5V to 5.5V
  • 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 (RT5753A)
  • Advanced Constant On-Time (ACOT®) Control
  • Internal Soft Startup (1.5ms)
  • Enable Control Input
  • Power Good Indicator
  • Both FETs Over-Current Protection
  • Negative Over-Current Protection (RT5753B)
  • Input Under-Voltage Lockout Protection
  • Output Under-Voltage Protection
  • Over-Temperature Protection
  • RoHS Compliant and Halogen Free
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3A, 1.2MHz, 5.5V Synchronous Step-Down Converter In WDFN-8L 2x22020/06/30
Part NumberPackage TypePackage Qty.Free SampleBuy From Authorized Distributor
RT5753AHGQWWDFN2x2-83000 Not available Buy from Distributor
RT5753AHGQWAWDFN2x2-8S3000 Not available Buy from Distributor
RT5753ALGQWWDFN2x2-83000 Request Buy from Distributor
RT5753ALGQWAWDFN2x2-8S3000 Not available Buy from Distributor
RT5753BHGQWWDFN2x2-83000 Not available Buy from Distributor
RT5753BHGQWAWDFN2x2-8S3000 Not available Buy from Distributor
RT5753BLGQWWDFN2x2-83000 Not available Buy from Distributor
RT5753BLGQWAWDFN2x2-8S3000 Not available Buy from Distributor