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The RT5721 is a step-down switching voltage regulator that delivers a digitally programmable output from an input voltage supply of 2.5V to 5.5V. The output voltage is programmed through an I<sup>2</sup>C interface capable of operating up to 3.4MHz.<br /><br />Using a proprietary architecture with synchronous rectification, the RT5721 is capable of delivering 1A continuously at over 80% efficiency, maintaining that efficiency at load currents as low as 10mA. The regulator operates at a nominal fixed frequency of 2.4MHz, which reduces the value of the external components. Additional output capacitance can be added to improve regulation during load transients without affecting stability.<br /><br /> At moderate and light loads, Pulse Frequency Modulation (PFM) is used to operate in Power-Save Mode with a typical quiescent current of 45&mu;A at room temperature. Even with such a low quiescent current, the part exhibits excellent transient response during large load swings. At higher loads, the system automatically switches to fixed- frequency control, operating at 2.4MHz. In the Shutdown Mode, the supply current drops below 1&mu;A, reducing power consumption. The PFM Mode can be disabled if fixed frequency is desired. The RT5721 is available in a small WL-CSP-11B 1.31x1.62 (BSC).
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  • 稳定 2.4MHz 开关频率
  • 快速负载瞬态
  • 连续输出电流能力：1A
  • 2.5V 至 5.5V 输入电压范围
  • 数位可程式输出电压
    ►0.3V 至 1.3V 可控输出电压转换速率
  • I2C 相容介面高达 3.4MHz
  • PFM 模式可在轻负载下实现高效率
  • PFM 模式下的静态电流：45μA（典型值）
  • 输入欠压锁定 (UVLO)
  • 热关断和过载保护
  • 电源良好指示
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应用程式、图形和 DSP 处理器<BR>&#9658;ARM<SUP>TM</SUP>、Tegra<SUP>TM</SUP>、OMAP<SUP>TM</SUP>、NovaThor<SUP>TM</SUP>、ARMADA<SUP>TM</SUP>、Krait<SUP>TM</SUP>, 等。<BR>硬碟、LPDDR3、LPDDR4<BR>平板电脑、上网本、超移动式个人电脑手机游戏设备
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