Hi ADI support team.
I employ LTC2974 in my new FPGA design to control the sequence of power on/off. I studied the datasheet and had some questions regarding the VOUT_ENx usage. Could you help clarify them?
There are some statements of VOUT_ENx as following figure in datasheet:
The questions are：
- If internal pull-up is enable, does it mean the Vohmax will be 14.7V
- If internal pull-up is disable, is the output format of VOUT_ENx open-drain? Then I need an external pull-up resister to a special power rail. I search for the example of external pull-up mode, but it looks all of the examples(figures) are used internal pull-up resistor in the datasheet.
In my project, LTC2974 VOUT_ENx will be used to control a LDO EN pin with a LVTTL 3.3 level. So I want to configure corresponding LTC2974 design as below, could you please help check whether it is correct and LTC2974 can work properly?
- Connect VOUT_EN1 to LDO EN pin with a pull-up resistor to 3.3V power.
- Set Mfr_config_vo_en_wpu_en = 0 :Disable weak pull-up. VOUT_EN pin driver is three-stated when channel is on.(I wonder whether it is the OD mode? Datasheet doesn’t describe it clearly. )
Thanks very much.