• LTC2955-1 Push Button Press Duration

    I want to implement the LTC2955-1 in our company project and would like to know the following.

    1. Am I correct to assume that if the Vin(wall-adapter) is connected to the ON pin of the LTC2955-1, then it automatically drives the output after a 32ms delay…

  • LTC2955-2 not working

    LTC2955-2 is either not working during the first power ON or goes into a faulty state after working for some time.
    In the fault state, VIN = 3.9V, PB pin goes low when the switch SW1 is pressed but EN (pin#7) as well as INT (pin#8) stays at high and never…

  • LTC2955 Question

    Does the INT pin go low when the pushbutton is pressed for OFF condition then goes high after the TMR runs out and at that time EN is disabled?

    I am asking if the INT proceeds the EN shutdown to notify the device of a coming powerdown.


  • LTC2955-2 soft start


    I plan to use LTC2955-2 as push button controller.

    My input voltage in 28.8V nominal. I have a 400uF capacitor at the input load. On simulation for LT spice i observe an inrush current of 160A.

    Does chip offer a configuration for soft start or slow…

  • LTC2955-1 occasionally ignores !PB input

    I'm having difficulties with LTC2955-1, where occasionally the chip doesn't respond to !PB input. Typically Vin = 7.3V and !PB = 4.7V unloaded. All other pins = 0V. Shorting !PB to GND has no effect, no output on EN. I apply many short pulses to !PB,…

  • RE: LTC2955-2 INT pin


    Can i leave the INT# pin open.

    You can leave the INT pin open. Please refer to fig#9 on the page#14 of the datasheet. 

    And how will the system turn on automatically

    Can you elaborate on this? Do you want to disable the Push…

  • LTC2955-1 ignores !PB input


    У меня проблемы с LTC2955-1, чип не реагирует на вход! PB. Vin = 5 В и! PB = 0,5 В без нагрузки. ! ON и! SEL  = 0V. Короткое замыкание! PB на GND не имеет никакого эффекта, нет выхода на EN. Я применяю много коротких импульсов к! PB, много длинных…

  • LTC2955-1 PB# Discharge issue

    In the datasheet of LTC2955-1, "automatic power up with pushbutton ON/OFF" control application is given on page no 22. While implementing the application when the device is turned off by the push button, I can't be switch it ON by the mains switch for…

  • LTC2955-2 /KILL pin pull-up resistor

    We have a 300k pull-up resistor connected to the VIN pin of the LTC2955-2. However the datasheet seems to show the pull-up resistor being connected after the series switch that the LTC2955-2 controls. The only advantage I can see connecting it here is…

  • LTC2955-1 Power Down by ON input.


    I have been using the LTC2955/LTC4412/LT3009-3.3 Demo Circuit to check power on circuit.

    I have modified the circuit by disconnecting the push button and tying the KILL input to 1V so I can check the circuit powers up when the 12V power is applied…