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LP38691QSD-5.0 (WSON) Question NC terminal and Output Capacitor

Other Parts Discussed in Thread: LP38691

Hello,

Please answer following question from customer.

 

Q1:

Please advise if NC terminal (3pin) of LP38691QSD-5.0 (WSON package) is opened internally.

Is it OK to connect NC terminal to GND or open?

 

Q2:

Customer wants to use large capacitance for output capacitor.

Datasheet explain minimum capacitance but no explanation about maximum capacitance.

Please explain about maximum capacitance to operate stable and no issue.

 

Best Regards.

  • Hello,

    Please answer my question.

    Customer is design phase using LP38691QSD-5.0 and needs answer soon.

     

    About Q2, customer wants to use around 50uF ceramic capacitor.

     

    Best Regards.

  • Hi Toshio,

    Please see the comments below:

     

    Q1

    The pin-3 of LP38691 does not have an internal connection as shown in figure 23 of the datasheet, this pin should not make a difference if left open or if connected to ground.

    Q2

    Section 9.1.1 implies that the device can operate with capacitors up to 1000 µF. However the ESR of the capacitor must be within the recommended value for stability (5 mΩ to 500 mΩ), it is also important to keep in mind that a higher capacitor reduces the load peak voltage transient, but increases the settle down time after the transient.

     Regards,

    Antony P. Carvajales