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TPS54616: measured value is not consistent with the datasheet

Yongchang Zhao
Prodigy 10 points
Part Number: TPS54616

When evaluate the TPS546116, I got 3 questions and need help please:

1. The input voltage in datasheet is 3V-6V, but the output voltage for this chips is 3.3v. The low limit of the input voltage (3V) seems not right, what is the lowest voltage should I give if I want to get a 3.3V output?

2. The IQ current I measured is about several mA larger than the datasheet (fs=350kHz, low limit is 9.6 mA and fs=550kHz is 12.8mA), is this right?

3. The enable voltage of SS/ENA pin in datasheet is 1.2V, but the chip can start when I give near 3V voltage, is the 1.2V on datasheet a wrong value?

Thanks.

  • 0
    TI__Guru**** 191445 points

    Yongchang,

    TPS54616is a buck converter so obviously the input voltage must be higher than the output voltage for proper regulation f the output.  That particular datasheet encompasses a range of devices with out put voltages from 0.9 V to 3.3 V.  The TPS5461X is designed to work with an input voltage range from 3 V to 6 V.  All the other output voltage options are below 3 V.  For TPS54616 the maximum duty cycle is 90% so the minimum required input voltage is about 3.7 V

    You ma possibly measure a slightly higher IQ in your circuit.  The datasheet specification is for the IC only measured in an open loop configuration.  There is no output filter, so there is no RMS current contribution do to an output inductor.

    The enable threshold is 1.2 V typical.  3 V is greater than 1.2 V, so 3 V will enable it as well.