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LM25066: Design multi channels LV power supply

stephane detraz
Prodigy 60 points
Part Number: LM25066
Other Parts Discussed in Thread: INA226, TPS25982, TPS2595, TPS25942A

Hello,

We have to design a circuit board to provide multiple low voltage power supplies to a large amount of DUTs.
We have 40 DUTs that require 1.2V(50mA max/per device) and 2.5V(100mA max/per device) each.
We would like to be able to power the device independently, to measure the current consumption for every voltages and to protect the devices in case of fault (short-circuit, over current…).
We should be able to read the PS status and currents and to switch ON/OFF every DUTs independently using I2C bus.

Trying to find the right components to design this PS board, we found out the LM25066 that seems to fit our need for channel selection and protection.
Using other TI components, we plan to use the attached (pdf) topology.
Do you have any advises/comments concerning the topology or the components selected. Do you have other components in your catalog for our application?

We plan to produce hundreds of these multi channels power supplies.

Best regards.We have to design a circuit board to provide multiple low voltage power supplies to a large amount of DUTs.
We have 40 DUTs that require 1.2V(50mA max/per device) and 2.5V(100mA max/per device) each.
We would like to be able to power the device independently, to measure the current consumption for every voltages and to protect the devices in case of fault (short-circuit, over current…).
We should be able to read the PS status and currents and to switch ON/OFF every DUTs independently using I2C bus.

Trying to find the right components to design this PS board, we found out the LM25066 that seems to fit our need for channel selection and protection.
Using other TI components, we plan to use the attached (pdf) topology.
Do you have any advises/comments concerning the topology or the components selected. Do you have other components in your catalog for our application?

Best regards.

  • 0
    TI__Guru* 95891 points

    Hi stephane,

    Can you share the attachment. Is it a system block diagram ?

    Regards, Rakesh

  • 0 in reply to stephane detraz
    TI__Guru* 95891 points

    Hi stephane,

    So you want to disable TPS79901 in that particular path if INA226 detects overload event ? 

    I think, it should be ok for overload events but the action response may be slow to cut OFF the path for short circuit event.

    Regards, Rakesh

  • 0 in reply to Rakesh
    Prodigy 60 points

    Hello Rakesh,

    I am not sure to understand all the LM25066 functionalities. I have just received a demo board and I still have to play with it. I guess, in case of overload, the LM25066 should limit the current (we can set 150mA for both voltage supplies). We could also connect the LM25066 PGOOD to both TPS enable pin?

    We want to use the INA to monitor the current during our test, not to protect the DUT. The I2C polling is going to act with the slower reaction time, to disable the overloaded channel for the test remaining time and report the failure to the operator.

    Cheers,

    Stéphane

  • 0 in reply to Rakesh
    Prodigy 60 points

    Dear Rakesh,

    I don't know if the LM25066 is going to suit our need.

    We would like a system that allow us to enable the voltage (P2V5 & P1V2) through I2C. The output voltages should be off until we send a command ON to the component.

    We also need a short-circuit protection that does not rely on over-temperature (like in most LDO). Indeed the application is a test bench. The over-current or short-circuit condition could be frequent and should not limit the PS system lifetime (I guess reaching high Tj temperature too often could reduce the component life time?). Moreover, we need to monitor the current values with a good accuracy (14-16 bits ADC) and read back fault conditions through I2C.

    I do not know if another TI component could do the job or if we have to build a system with multiple circuits and probably use I2C IO?

    Cheers

  • 0 in reply to stephane detraz
    TI__Guru* 95891 points

    Hi Stephane,

    With I2C control, LM25066 is the right choice for accurate overload and short circuit protection. There are other options like TPS2595, TPS25982, TPS25942A without I2C control

    Regards, Rakesh