RT5751C Datasheet | Richtek

Description The RT5751C/D is a simple, easy-to-use, 1.5A synchronous step-down DC-DC converter with an input supply voltage range from 2.8V to 6V. The device builds in an accurate 0.6V reference voltage and integrates low RDS(ON) power MOSFETs to achieve high efficiency in WDFN-6L 2x2, TSOT-23-5 and TSOT-23-6 packages. The RT5751C/D adopts Advanced Constant On-Time (ACOT® ) control architecture to provide an ultrafast transient response with few external ponents and to operate at nearly constant switching frequency over the line, load, and output voltage range. The RT5751C operates in automatic PSM that maintains high efficiency during light load operation. The RT5751D operates in Forced PWM that helps to meet tight voltage regulation accuracy requirements. The RT5751C/D senses both FETs current for a robust overcurrent protection. The device features cycle-by-cycle current-limit protection and prevents the device from the catastrophic damage in output short circuit, overcurrent 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, and over-temperature protection to provide safe and smooth operation in all operating conditions. Features - Input Voltage Range from 2.8V to 6V - Integrated 120m and 80m FETs - 1.5A Output Current, up to 95% Efficiency - 100% Duty Cycle for Lowest Dropout - 1% Internal Reference Voltage - 1.5MHz Typical Switching Frequency - Power Saving Mode for Light Loads (RT5751C) - Low Quiescent Current: 25A (Typ.) - Fast Advanced Constant On-Time (ACOT® ) Control - Internal Soft-startup (0.6ms) - Enable Control Input - Power Good Indicator - Both FETs Overcurrent Protection - Negative Overcurrent Protection (RT5751D) - Input Undervoltage Lockout Protection - Hiccup-Mode Output Undervoltage Protection - Over-Temperature Protection - Ro HS pliant and Halogen Free Applications - Mobile Phones and Handheld Devices - STB,...