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TPS65160: Turn off VGH and VGL

Zhen Luo18
Prodigy 60 points
Part Number: TPS65160

Hi guys,

I'm working on a LCD-TFT-like project. I found out this TPS65160 chip is dedicated made for LCD-panel as a PMIC with a controllable power-on sequencing, which is also very import for my board as well. I need VS and V_logic in a correct power-on sequencing. All of the features are fitting well but I don't need VGH and VGL. Is there a possibility to turn them off? If not, what should I do with VGH and VGL pin to make sure they will not effect other components on the board and not consume unwanted power. 

Kind regards,

Zhen

  • 0
    TI__Expert 6330 points
    Hi,

    I have notified our expert regarding this topic. Please expect a response by 12/6/18.

    Thanks,
    Aaron
  • 0
    TI__Mastermind 18550 points
    Hi Zhen,
    Typical application for this device is to have the VGH/VGL supplies active and I do not see a way to completely disable the relevant circuitry in the device. In normal operation, negative charge pump's feedback pin (FBN) is regulated to 0V and positive charge pump's feedback pin is regulated to typical 1.213V. So you may be able to connect FBN pin to GND and FBP pin to feedback pin of the buck (FBB) to trick the internal error amps into thinking that negative and positive charge pimps are well regulated. This way you may be able to remove the external components for the charge pumps.
    I hope this information is helpful.
    Kind Regards,
    Liaqat
  • 0 in reply to Liaqat Khan
    Prodigy 60 points

    Hi Liaqat,

    Thank you for your reply. I think your idea makes sense. I will first try on EVM board then implement on my design if it works.

    Kind regards,

    Zhen