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The RT4803B allows systems to take advantage of new battery chemistries that can supply significant energy when the battery voltage is lower than the required voltage for system power ICs. By combining built-in power transistors, synchronous rectification, and low supply current, this IC provides a compact solution for systems using advanced Li-Ion battery chemistries.<br />The RT4803B 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 the system minimum. In boost mode, output voltage regulation is guaranteed up to a maximum load current of 2000mA. The quiescent current in shutdown mode is less than 1&mu;A, which maximizes battery life. The regulator transitions smoothly between bypass and normal boost modes. The device can be forced into bypass mode to reduce quiescent current.<br />The RT4803B is available in the WL-CSP-16B 1.67x1.67 (BSC) package. The recommended junction temperature range is -40&deg;C to 125&deg;C, and the ambient temperature range is -40&deg;C to 85&deg;C.
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  • Input Voltage Range: 1.8V to 5V
  • Programmable Output Voltage from 2.85V to 4.4V with 50mV/Step
  • Default Boost Output Voltage Setting:
    ► VOUT = 3.4V at VSEL = H
    ► VOUT = 3.15V at VSEL = L
  • Maximum Continuous Load Current: 2A at VIN > 2.65V Boosting VOUT to 3.35V
  • Up to 95% Efficiency
  • nBYP (L): Forced Bypass Mode
  • nBYP (H): Auto Bypass Operation when VIN > Target VOUT
  • Internal Synchronous Rectifier
  • Overcurrent Protection
  • Undervoltage Protection
  • Overvoltage Protection
  • Over-Temperature Protection
  • Ultra-Low Operating Quiescent Current
  • Discharge Function Triggered at GPIO Manual Pull Low
  • Available in a WL-CSP-16B 1.67x1.67 (BSC) Package
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Single-Cell Li-Ion, LiFePO4 for Smartphones or Tablets<br />2.5G/3G/4G Mini-Module Data Cards
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Keyword 1

Keyword 2

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