Are there any pmos and nmos tubes with working current |Ids|=1.2A;|Vds|<0.2V, which don't matter if they are enhanced or not, and have low leakage current when turned off?

oyhprince

Are there any pmos and nmos tubes with working current |Ids|=1.2A;|Vds|<0.2V, which don't matter if they are enhanced or not, and have low leakage current when turned off? [Copy link]

 

RT! Mainly used for power switches, it is continuous conduction, not high-frequency switching. A 10khz is enough. It also requires small Rds, small static current, and small leakage current when turned off.

Please let me know the specific model;

qwqwqw2088

|Vds|<0.2V,,, what the OP wants to express is the conduction voltage drop between DS, which is related to the internal resistance

When selecting a MOS tube, you should also consider the voltage environment, the maximum voltage that the MOS DS can withstand, the on-resistance of the DS, and the maximum current that the load can withstand under all conditions, which should be larger than the actual current.

maychang

The voltage drop of a power MOS tube is equal to the current passing through the MOS tube multiplied by the on-resistance. According to the original poster's description, if the current passing through is 1.2A and the voltage drop is required to be less than 0.2V, then you only need to choose a tube with an on-resistance R DS (on) less than 0.2/1.2 = 0.1667 ohms. There are quite a lot of such MOS tube models. Of course, the withstand voltage must be considered according to the power supply voltage used.

qwqwqw2088

For example

Because the host does not have a pressure-resistant environment, let me briefly talk about it.

For example, similar to the power size selected by the OP, the SI4812 MOS tube is an N-channel.
According to the data, N-Channel 30-V (DS)

Also, P tube IRF7205

oyhprince

qwqwqw2088 posted on 2020-5-3 18:51 For example, since the OP does not have a voltage-resistant environment, let me roughly talk about the power size selected by the OP. For example, the SI4812 MOS tube is an N-channel...

Is Vds = Ids * Rds? Or is it fixed?

My requirement is that the switch voltage is low. If Vds is raised, the subsequent load will not work properly.

oyhprince

Let's talk about the withstand voltage Vdd <= 6.3V

oyhprince

What I want is Schottky's p/n MOS tube

oyhprince

qwqwqw2088 posted on 2020-5-3 18:51 For example, since the OP does not have a voltage-resistant environment, let me roughly talk about the power size selected by the OP. For example, the SI4812 MOS tube is an N-channel...

Withstand voltage: Vdd <= 6.3V

qwqwqw2088

oyhprince posted on 2020-5-3 20:33 What I want is Schottky's p/n MOS tube

There is no Schottky MOSFET

Schottky diode

It is recommended to clarify the basic requirements of the pipe type first

qwqwqw2088

oyhprince posted on 2020-5-3 20:18 Let's talk about the withstand voltage Vdd <= 6.3V

What does Vdd mean?

qwqwqw2088

According to the requirements of the MOS tube described by the original poster, low voltage

Also used in switching power supply,,,,?

Don't choose MOS tubes blindly like this

It is recommended to first understand the principle of the switching power supply you want to make, and then choose the switching tube.

oyhprince

qwqwqw2088 published on 2020-5-3 21:12 According to the requirements of the MOS tube described by the original poster, the low voltage is used in the switching power supply,,,,? Don't choose the MOS tube blindly. It is recommended to first...

Without making a switching power supply, it is just a lithium battery charging and discharging circuit. When the lithium battery is plugged in for charging, discharging is prohibited and it is disconnected by pmos; when the power is unplugged, the lithium battery discharges and pmos is turned on.

oyhprince

qwqwqw2088 Published on 2020-5-3 21:02 There is no such thing as Schottky for MOS tubes. It is recommended to first clarify the basic requirements of the tube type for Schottky diodes

oyhprince

qwqwqw2088 posted on 2020-5-3 21:07 What does this Vdd mean and what does it control

It is the power supply voltage of the entire electronic system, connected to the voltage of pmos D level

qwqwqw2088

oyhprince posted on 2020-5-3 21:19 qwqwqw2088 posted on 2020-5-3 21:12 According to the requirements of the MOS tube described by the original poster, the low voltage is used in the switching power supply,,,,? Don't do this...

qwqwqw2088

oyhprince posted on 2020-5-3 21:19 qwqwqw2088 posted on 2020-5-3 21:12 According to the requirements of the OP's description of MOS tubes, low voltage is used in switching power supplies,,,,? Don't do this...

No matter where the MOS tube is used,

What is the withstand voltage value and what is the current that needs to pass through? This is the basic factor in selecting a MOS tube.

qwqwqw2088

To put it simply, you need to know the lithium battery charging and discharging circuit to be used, how many strings of lithium batteries are there in this charging and discharging circuit, how high the voltage is, and the charging and discharging current.

You should have told everyone at the beginning,,,, so that you can give the original poster some advice.

oyhprince

qwqwqw2088 posted on 2020-5-3 21:23 No matter where the MOS tube is used, what is the withstand voltage value and how much current needs to pass through, this is the basic factor in selecting the MOS tube

Withstand voltage 6.3V, current 1.2A

oyhprince

qwqwqw2088 posted on 2020-5-3 21:27 To put it bluntly, you need to know the lithium battery charging and discharging circuit to be carried out, how many strings of lithium batteries are there in this charging and discharging circuit, how high the voltage is, the charging and discharging current, etc.

Polymer lithium battery discharge voltage 2.3V~4.2V, maximum discharge current 1A

qwqwqw2088

oyhprince posted on 2020-5-3 22:25 Polymer lithium battery discharge voltage 2.3V~4.2V, maximum discharge current 1A

If PMOS has been determined

You can take a look

AO4403，AO4405，AO4407

Used in lithium battery charging and discharging circuits, just choose one