Current limiting I/O interface and isolated load switch driver IC
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United States of America Patent
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Oct 20, 2020
Grant Date -
N/A
app pub date -
Aug 29, 2019
filing date -
Apr 20, 2017
priority date (Note) -
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Abstract
Disclosed examples include isolated load switch driver circuits to drive a load, including an impedance circuit that receives a digital input voltage signal from a signal source, and selectively allows a current signal to flow from the signal source to charge a buffer capacitor. An impedance control circuit controls the impedance circuit to limit the current signal in response to the buffer capacitor reaching a first threshold voltage, and an output circuit provides an output isolated from the digital input voltage signal to switch the load. A signaling circuit selectively enables the output circuit to draw power from the buffer capacitor in response to the voltage of the buffer capacitor reaching the first threshold voltage.
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