MOS tube leakage current

QWE4562009

MOS tube leakage current [Copy link]

MOS tube leakage current

In micro wearable devices, the power consumption of the battery is very high, so in order to save power, there are actually many circuits. The most power-saving is undoubtedly to directly disconnect the battery power supply.

This solution requires the use of a combination of an NMOS and a PMOS, with the NMOS acting as the lower tube to control the output of the PMOS.

NMOS and PMOS themselves also consume current. We should focus on the two leakage current parameters IGSS and IDSS of NMOS and PMOS. Generally, what leakage current is considered extremely low?

qwqwqw2088

This is related to the power of the tube, and also to different brands.
The larger the ID current, the greater the leakage current.
The leakage current of low-power tubes is also smaller.

qwqwqw2088

Low-power devices that should be used in wearable devices, including MOS tubes

When the tube is turned off, the leakage current should be small.

2N7002 max 1uA

qwqwqw2088

qwqwqw2088

There is no minimum standard. The minimum requirement is endless. The minimum is what suits you and meets your requirements.

baopodao

The battery itself has a self-discharge characteristic, as long as the leakage current of the device is much lower than the battery self-discharge.

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qwqwqw2088 posted on 2021-10-12 22:13

Yes, basically they are all above 1uA

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baopodao posted on 2021-10-13 12:34 The battery itself has a self-discharge characteristic, as long as the leakage current of the device is much lower than the battery self-discharge.

Battery self-discharge is much greater than 1uA?

baopodao

Self-discharge is related to the capacity of the battery. Generally, a 1Ah lithium battery has a self-discharge of several tens of microamperes. By contrast, a 100mA lithium battery has a self-discharge of several microamperes.

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baopodao posted on 2021-10-16 11:16 Self-discharge is related to the capacity of the battery. Generally, a 1Ah lithium battery has a self-discharge of tens of microamperes. In this way, a 100mA lithium battery has a self-discharge of several microamperes.

So big? Then what is the self-discharge of 50mAh?