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Original question:

TPS54302: Output voltage is too high

TPS54302: Voltage between Vin and Vout

Shunsuke Nagata
Genius 13230 points
Part Number: TPS54302


Hi,

Is there requirement voltage between Vin and Vout? e.g. will it support Vout = 4.2 when Vin = 5V?

I understand TPS54302 support 100% duty. But could you please let me confirm if the device support Vout = 5V if Vin = 5V?

(I guess there is no time to charge external cap for charge pump when the duty rate is 100%).

Regards,
Nagata.

  • 0
    TI__Genius 9860 points

    Hi ,

    TPS54302 can support not real 100% duty, the high side FET would be turned off when the BOOT to SW pin voltage is lower than 2.1 V typically and the low-side FET is turned on to charge the boot cap. 

    And this 100% duty is related with the loading current . The smaller loading current , the larger duty can support . Meaning that it can almost support 5vin-5vout at light loading . The larger Vin may needed to support 5vout with larger loading current . 

    Attach app note about 100% for your reference .Understanding 100% duty in DCDC converters'.pdf

    BRs,

    Young