100 mA is slightly beyond the capability of analog switch ICs, I would use a MOSFET H-bridge. Gate drive solution depends on the LDO voltage range.
Hi,
Your schematic looks like an "H bridge". On the conduction state of the transistors there would be some loses, how sensitive is your load ?
Hi,
something like TS5A23160, rated for 5V, 200mA.
But be careful they are Make-before-break.
Klaus
A double-pole, double-throw mechanical relay will also do what you want.
Hi,
Make-before-break means that during switching there is a short time where all the terminals are shorted together: NO+COM+NC.
When you connect NO and NC to the supply rails, then this causes a short. So don't do this.
Either you choose a connection where the short causes no problem, or you choose an other switch.
Klaus
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Yes, all mechanical are break before make.Hi crutschow, will “Make-before-break” happen in mechanical relay as well? If not, would you recommend one part I can use, to have at least 50mA continuous switch current capability?
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Yes, all mechanical are break before make.
Just about any small DPDT relay should work. (Where do you buy parts?)
Just pick one with the operating coil voltage you want.
You will likely need a transistor driver to provide the coil current.
Be sure you put a diode (such as a 1N4148) across the coil (cathode to plus voltage side of coil) for transient suppression.
Yes, that Vishay analog switch should work for 0-100mA as long as your voltage is no higher than 5V.Hi crutschow, can I also use normal break-before-make analog switches? I want to minimize the external components count. Do you think this one can achieve the similar function as DPDT relays? I will buy parts from digikey or mouser.
https://www.vishay.com/docs/67590/dg2735a.pdf
Yes, that Vishay analog switch should work for 0-100mA as long as your voltage is no higher than 5V.
Note that the minimum supply and control voltages are 1.65V.
Yes to the first, no to the second.Thank you crutschow. The last question, when you are saying the minimum control voltage, you are talking about minimum logic "1", is it correct? If I have 0V and 5v to this control pin, it will not be a problem, is it correct?
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