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TPS63050: behavior at Vin = Vout. Seamkless or unstable?

user4843757
Prodigy 70 points
Part Number: TPS63050

Hello, I've got a design on which I'm trying to stabilize the voltage on a very sensitive (to ripple) module. The module would normally receive 5.17V and the ripple is constrained at max 35mVpp. Occasionally the input drops or has higher ripple so I've decided to insert TPS63050RMWR chip to keep the 5.17V under control but I am worried that at Vin Voltages close to the Vout, the Vout may not be stable enough even though the datasheet says "seamless transition between buck and boost.  I simulated this in WeBench and it appears to work based on my input data and simulation results but des anyone has real life experience with tis type of configuration or can anyone comment if this would be the right chip to use? The current is max 0.5A

  • 0
    TI__Guru 65200 points

    Hello user4843757,

    TPS63050 is working stable when the input voltage is at the same level at the output voltage. For your need of 35mVpp, the part needs to operate in PWM with fixed frequency, but then with enough output capacitance, this goal can be achieved.

    It makes sense to have a high-frequency capacitor close to the IC to filter the switching noise. Capacitors with several uF are normally inductors at these high rise and fall times of the switch nodes.