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TPS61027: EN control

user3856888
Prodigy 10 points
Part Number: TPS61027

TPS61027 has been used for a hand-held device to boost 3V battery to 5V for MPU and other circuit.

The EN of TPS61027 should be high normally. To save energy the EN should be set to low. I plan to do so by using the MPU to control the EN input.

my questions are:

1. the value of pull-up resistor on EN, or two resistors as devider should be used.

2. once the EN set low by MPU, the VOUT becomes VBAT at most. Not sure the MPU still working continuously to set EN low.

  • 0
    TI__Guru* 78260 points
    My colleague who is responsible for this part may get back to you early next week. I just looked at the datasheet. The EC table shows that the EN only takes 0.1uA max, implying a very high impedance. Therefore, the pull up resistor can be 0 up to Mega Ohms.

    Regarding your second question, why do you use the MPU to control its bias power supply? It seems to be a logic conflict. Could explain a little more?