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数据搜索系统，热门电子元器件搜索 |
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L9678P 数据表(PDF) 32 Page - STMicroelectronics |
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L9678P 数据表(HTML) 32 Page - STMicroelectronics |
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32 / 203 page  Start-up power control L9678P, L9678P-S 32/203 DocID029274 Rev 3 4.3.5 VDD3V3 linear regulator The fully integrated VDD3V3 linear regulator provides 3.3 V system voltage derived directly from VDD5. This voltage rail is used in case a 3.3 V micro-controller is adopted. The stability of the regulation loop is guaranteed by use of a small external capacitor. Current limitation is implemented and its maximum current capability on VDD3V3 is 125 mA. The VDD3V3 regulator is enabled in the ACTIVE mode and continues operation in the PASSIVE mode using power from energy reserve. VDD3V3 supply is monitored for system reset (see Power On Reset and Reset in Section 4.4); voltage monitoring is based on a second redundant bandgap voltage reference. Note that if the VDDQ pin (digital outputs supply) is connected to the VDD3V3, and any of the digital output pins are connected to 5 V logic, there is no internal blocking diode to prevent back-feeding this 3.3 V supply. Figure 15. VDD3V3 control behaviour |
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