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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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  • 输入电压范围：1.8V~5V
  • 可程控输出电压范围：2.85V~4.4V，级差50mV
  • Boost输出电压默认值：
    ►VOUT = 3.4V @VSEL = H
    ►VOUT = 3.15V @VSEL = L
  • 最大连续负载能力：2A @ VIN > 2.65V, VOUT = 3.35V
  • 效率高达95%
  • nBYP = L：强制旁通模式
  • nBYP = H：当 VIN > VOUT 目标值时自动旁通
  • 内置同步整流开关
  • 过流保护
  • 欠压保护
  • 过压保护
  • 过热保护
  • 超低静态工作电流
  • GPIO人为拉低时触发输出端放电功能
  • WL-CSP-16B 1.67x1.67 (BSC) 封装
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使用单节锂离子电池、磷酸铁锂电池的智能手机、平板计算机 2.5G/3G/4G小型数据卡
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