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The RT8231C provides a complete power supply for DDR2/DDR3/DDR3L/LPDDR3/DDR4/LPDDR4 memory systems. It integrates a synchronous PWM Buck controller with a 1.5A sink/source tracking linear regulator and buffered low noise reference. <p align="justify">The PWM controller provides the low quiescent current, high efficiency, excellent transient response, and high DC output accuracy needed for stepping down high-voltage batteries to generate low-voltage chipset RAM supplies in notebook computers. The constant on-time PWM control scheme handles wide input/output voltage ratios with ease and provides 100ns "instant-on" response to load transients while maintaining a relatively constant switching frequency. </p><p align="justify">The RT8231C achieves high efficiency at a reduced cost by eliminating the current-sense resistor found in traditional current mode PWMs. Efficiency is further enhanced by its ability to drive very large synchronous rectifier MOSFETs. The Buck conversion allows this device to directly step down high-voltage batteries for the highest possible efficiency. </p><p align="justify">The 1.5A sink/source LDO maintains fast transient response only requiring a 10μF ceramic output capacitor. In addition, the LDO supply input is available externally to significantly reduce the total power losses. The RT8231C supports all of the sleep state controls placing VTT at high-Z in S3 and discharging VDDQ, VTT and VTTREF (soft-off) in S4/S5. </p><p align="justify">The RT8231C provides protections including OVP, UVP, and thermal shutdown. The RT8231C is available in the WQFN-20L 3x3 package.</p>
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- PWM 控制器
► 下桥 RDS(ON) 检测方式的可调电流限制
► 低静态电流消耗
► 100ns 快速瞬态响应能力
► 全输入、负载范围内 1% VVDDQ 电压精度
► 0.675V至3.3V 可调输出范围，可供 1.8V (DDR2)、1.5V (DDR3)、1.35V (DDR3L)、1.2V (LPDDR3)、1.2V (DDR4) 和 1.1V (LPDDR4)
► 输入电压范围：4.5V至26V
► 工作频率由电阻调节
► 过压/欠压保护
► 内置软启动
► 可驱动大型同步整流 MOSFETs
► Power Good 指示 - 1.5A LDO (VTT)，带缓冲的参考源(VTTREF)
► 高达 1.5A 电流吐纳能力
► LDO 输入可选，优化功率损失
► 仅需 10μF 陶瓷输出电容
► 集成分压器使 VTT 和 VTTREF 追踪 1/2 VDDQ
► VTTREF 和 VTT 的精准度：±20mV
► 支持 S3 的高阻状态和 S4/S5 的软关机操作 - 符合 RoHS 规范，不含卤素
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DDR2/DDR3/DDR3L/LPDDR3/DDR4/LPDDR4 内存电源 笔记本电脑 SSTL18, SSTL15 和 HSTL 总线终端
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