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OPA4379: OPA4379 Damage problem

Hardy Ma
Intellectual 470 points
Part Number: OPA4379
Other Parts Discussed in Thread: CC2541

Dear TI：

In BLE thermometer project using OPA4379 has damage phenomenon.  By the screenshots shown below: 

The OPA power supply voltage(AVCC) is controlled by CC2541 P1_0 .  When AVCC is low and battery is full, OPA input always connect on the resistive divider network .

Please help analyze , the input voltage is higher than the supply voltage might damage the OPA ? Or is there any other possibility of damage ? Many thanks~

  • 0
    TI__Guru 69541 points

    Hardy,

    Most op amps, including OPA4379, have reverse-biased ESD protection diodes between each pin and power supplies.  For that reason, the input terminals voltage absolute maximum rating is specified up to 0.5V beyond the rail and if you exceed this voltage, you must limit the current to 10mA or less (see Absolute Maximum Rating table below) - this may be accomplished by placing a properly sized resistor in series with the input terminal.