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The RT4822 integrates built-in power transistors, synchronous rectification, and low supply current to provide a compact solution for systems using advanced Li-Ion battery chemistries. The RT4822 is capable of supplying significant energy when the battery voltage is lower than the required voltage for system power ICs.<br /><br />The RT4822 is a boost regulator designed to provide a minimum output voltage from a single-cell Li-Ion battery, even when the battery voltage is below system minimum. In boost mode, output voltage regulation is guaranteed to a maximum load current of 1500mA. Quiescent current in shutdown mode is less than 1&mu;A, which maximizes the battery life. The regulator transitions smoothly between bypass and normal boost mode. The device can be forced into bypass mode to reduce quiescent current.<br /><br />The RT4822 is available in the WL-CSP-9B 1.3x1.2 (BSC) package.
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  • Ultra-Low Operating Quiescent Current
  • Quickly Start-Up Time (< 400μsec)
  • 3 Few External Components: 1μH Inductor, 0402 Case Size Input and 0603 Case Size Output Case Size Capacitors
  • Input Voltage Range: 1.8V to 5.5V
  • Programmable Output Voltage from 3.15V to 5.5V with 25mV/Step
  • Support VIN > VOUT Operation
  • Default Boost Output Voltage Setting: VOUT = 5V
  • Maximum Continuous Load Current: 1.5A at VIN > 3.6V Boosting VOUT to 5V
  • Up to 93% Efficiency
  • Internal Synchronous Rectifier
  • Overcurrent Protection
  • Cycle by Cycle Current Limit
  • Undervoltage Protection
  • Overvoltage Protection
  • Short-Circuit Protection
  • Over-Temperature Protection
  • Small WL-CSP-9B 1.3x1.2 (BSC) Package
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NFC Device Power Supply<br />USB Charging Ports<br />PC Accessory Application (Keyboard, Mouse...etc.)<br />TWS (True Wireless Stereo) Hall Sensor<br />Gaming Device Sensor
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