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TPS61202: On-State Clarification

Deklen Crocker
Prodigy 20 points
Part Number: TPS61202

Hi there!

I've been looking into using the TPS61202 IC and have been doing some preliminary design verification testing with an evaluation unit before I proceed with my design, and I am producing a few issues that I can't seem to overcome.

In my characterization tests with the TPS61202EVM-179, I have been running into the problem that the output does not appear to activate until the input voltage reaches >2V (which based on the datasheet seems inconsistent).

I have done tests where I test the output voltage with no load (the enable pin set to active independently and tied to VBAT), and other tests using a 1Ohm resistor and another with a 1.01kOhm load and they are all producing the same results and I don't understand why. 

Hoping to receive a bit of clarification on the cause in case someone has faced this problem before. 

I appreciate all the help I can get with this!

Cheers!

  • +1
    TI__Expert 8245 points

    Hi the boost begins to regulate vout until vin reaches 2.5V.

    Please refer to datasheet 10.3.1.4for detailed explaination.

    During start-up of the converter, the duty cycle and the peak current are limited in order to avoid high peak currents drawn from the battery. After being enabled, the device starts operating. At first, it keeps the main output VOUT disconnected, and charges the capacitor at VAUX. Once the capacitor at VAUX is charged to about 2.5 V, the device switches to normal operation. T