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The RT5757A is a high-performance, synchronous step-down DC-DC converter that can deliver up to 7A output current from a 3V to 6.5V input supply. The output voltage is programmable from 0.6V to 1.725V with I<sup>2</sup>C controlled 7-bit VID.<br /><br />The device integrates low R<sub>DS(ON)</sub> power MOSFETs, accurate 0.6V reference and an integrated diode of bootstrap circuit to offer a very compact solution.<br /><br />The RT5757A adopts Advanced Constant On-Time (ACOT<sup>®</sup>) control architecture that provides ultrafast transient response and further reduces the external-component count. In steady states, the ACOT<sup>®</sup> operates at nearly constant switching frequency over line, load and output voltage ranges and makes the EMI filter design easier. The RT5757A offers automatic PSM that maintains high efficiency during light load operation. The RT5757A can also operate in Forced-CCM through I<sup>2</sup>C setting that helps meet tight voltage regulation accuracy requirements.<br /><br />The device offers a variety of functions for more design flexibility. The switching frequency, current limit level and over-temperature threshold are selectable via I<sup>2</sup>C. Independent enable control input pin and power good indicator are also provided for easy sequence control. Besides, the designer can also enable or shutdown the device via the I<sup>2</sup>C interface.<br /><br />The device offers independent enable control input pin and power good indicator for easy sequence control. To control the inrush current during the startup, the device provides a programmable soft-start up by an external capacitor connected to the SS pin. Full protection features are also integrated in the device, including the cycle-by-cycle current limit control, UVP, input UVLO and OTP. <br /><br />The RT5757A is available in a thermally enhanced UQFN-13L 3x3 (FC) package.
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- 极快的瞬态响应
- 稳定 1MHz ±20% 开关频率
- 先进的固定导通时间控制回路
- 针对多层陶瓷输出电容器进行了最佳化
- 3V 至 6.5V 输入电压范围
- 整合12mΩ/8mΩ MOSFET
- 内部启动至预偏压输出
- 电源良好指示
- 启用控制
- 过电流和过温保护
- 带有打嗝模式的欠压保护
- 透过 I2C 相容介面的 VID 控制范围：0.6V 至 1.725V, 每一段电压调整 = 12.5mV
- 结温范围：-40°C 至 125°C
- 环境温度范围：-40°C 至 85°C
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行动电话和手持设备 机上盒、电缆数据机和数字用户线路平台 无线区域网客制化晶片, 电源/储存（固态硬碟和机械硬碟） 通用负载端电源, 低输出电压降压转换器 电视
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