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The RT5753 is a simple, easy-to-use, 3A 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 R<sub>DS(ON)</sub> power MOSFETs to achieve high efficiency in WDFN-8L 2x2 and WDFN-8SL 2x2 packages. <br /><br />The RT5753 adopts Advanced Constant On-Time (ACOT<sup>&reg;</sup>) 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/C/E/F operates in automatic PSM that maintains high efficiency during light load operation. The RT5753B/D operates in Forced PWM that helps to meet tight voltage regulation accuracy requirements. <br /><br />The RT5753 senses both FETs current for a robust overcurrent 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 undervoltage lockout, output undervoltage protection, overvoltage protection (RT5753AL/BL/CL/DL/EL/FL) and over-temperature protection to provide safe and smooth operation in all operating conditions.
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  • 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 (RT5753A/C/E/F)
  • Advanced Constant On-Time (ACOT®) Control
  • Internal Soft-Start (1.5ms/750μs)
  • Enable Control Input
  • Power Good Indicator
  • Both FETs Overcurrent Protection
  • Negative Overcurrent Protection (RT5753B/D)
  • Input Undervoltage Lockout Protection
  • Output Undervoltage Protection
  • Over-Temperature Protection
  • RoHS Compliant and Halogen Free
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Mobile Phones and Handheld Devices<br />STB, Cable Modem, and xDSL Platforms<br />WLAN ASIC Power / Storage (SSD and HDD)<br />General Purpose for POL LV Buck Converters
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