TPS65258参考设计电路|DC-DC 转换器应用电路
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TPS65258是一个具有3个降压变换器的电源管理集成电路（IC），由于具有集成的高侧和低侧MOSFET，它能够提供更高效的完全同步转换。此篇主要介绍了TPS65258特性、应用范围、参考设计电路以及电路分析，帮助大家缩短设计时间。
TPS65258特性：高跨度输入供电电压范围:4.5V-16V；外部软启动引脚；具有简单补偿电路的电流模式控制；强制PWM模式
TPS65258典型应用范围：STB/DVR/流媒体
TPS65258参考设计应用电路：
图1TPS65258内部结构图
TPS65258is a power management IC with three step-down buck converters. Both high-side and low-side MOSFETs are integrated to provide fully synchronous conversion with higher efficiency. The converters are designed to simplify its application while giving the designer the option to optimize their usage according to the target application.
图2TPS65258参考设计图
TPS65258features a supervisor circuit which monitors each buck’s output and the PGOOD pin is asserted once sequencing is done. The PGOOD pin is an open drain output. The PGOOD pin is pulled low when any buck converter is pulled below 85% of the nominal output voltage. The PGOOD is pulled up when all converter outputs are more than 90% of its nominal output voltage. The default reset time is 100 ms. The polarity of the PGOOD is active high.
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