LTC2970 Vout Pin Default Type

Hi Jack,

    At power-on the LTC2970 VOUT0/1 pins are high impedance. It is only after you command the part to connect the DAC, using an SMBus command, that it will begin driving. You should design your DC/DC power converter to start in a safe configuration before the LTC2970 begins to drive it. This might include either configuring the feedback resistors to drive a safe voltage, or using the GPIO pins to command the DC/DC converter OFF at start-up so the MCU has a chance to initialize the LTC2970 registers before the DC/DC turns on. Ideally you will do both of these, since it adds safety to the system.

Thanks!
  Nathan

Hi Jack,

    At power-on the LTC2970 VOUT0/1 pins are high impedance. It is only after you command the part to connect the DAC, using an SMBus command, that it will begin driving. You should design your DC/DC power converter to start in a safe configuration before the LTC2970 begins to drive it. This might include either configuring the feedback resistors to drive a safe voltage, or using the GPIO pins to command the DC/DC converter OFF at start-up so the MCU has a chance to initialize the LTC2970 registers before the DC/DC turns on. Ideally you will do both of these, since it adds safety to the system.

Thanks!
  Nathan