Application note on NX5P/NX18P3001 bidirectional high-end power switch

“This document is an application note for NX5P / NX18P3001 bidirectional high-end power switch, suitable for charger and USB-OTG combination applications. It introduces the failure mode and impact analysis (FMEA) of the device pins of NX5P/NX18P3001.

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This document is an application note for NX5P / NX18P3001 bidirectional high-end power switch, suitable for charger and USB-OTG combination applications. It introduces the failure mode and impact analysis (FMEA) of the device pins of NX5P/NX18P3001.

introduce

NX5P / NX18P3001 is an advanced two-way power switch and ESD protection device, suitable for USB-OTG and charger port combination applications. It includes undervoltage lockout, overvoltage lockout and overheat protection circuits, which are designed to automatically isolate the power switch terminals in the event of a fault condition.

The device has two power switch input/output terminals (VBUSI and VBUSO), an open-drain acknowledge output (ACK), and an enable input, which includes logic level conversion (EN) and low capacitance transient voltage suppression (TVS) ) Type ESD clamp circuit, used for USB data and ID pins.

When EN is set to a high level, the device enters a low-power mode, thereby disabling all protection circuits. When used in a charger and USB-OTG combination application, the VBUSI switch terminal, which can withstand a voltage of 30 V, is used as a power supply and switch input during charging. For USB-OTG, the VBUSO switch terminal is used as power supply and switch input.

Designed for operating voltages from 3.2 V to 6.35 V (17.5 V for NX18P3001), it is used for battery charging and power domain isolation applications to reduce power consumption and extend battery life.

Pin FMEA

This chapter provides FMEA (failure mode and impact analysis) under typical fault conditions. When the pins of the bidirectional high-end power switch of the charger and USB-OTG combination application series are short-circuited to provide IO, GND or neighbor pins, or only remain Down to open.

A single fault is classified according to its corresponding impact on equipment and functions. Refer to Table 1 on Figure 2.

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