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about the max output current of tps6300x

li haihong
Prodigy 50 points


Hi:

     There are some current datas in datasheet make me confused:

· 1200-mA Output Current at 3.3V in Step Down Mode (VIN = 3.6V to 5.5V)

· Up to 800-mA Output Current at 3.3V in Boost Mode (VIN > 2.4V)

The maximum average current in the switches is limited to a typical value of 1800 mA.（like the title HIGH EFFICIENT SINGLE INDUCTOR BUCK-BOOST CONVERTER WITH 1.8-A SWITCHES）

So my quesion is:

1,what the 1800mA really mean? Are there any relationship with  the output current in stepdown/boost mode

2,the output current is given at 3.3V output,so when 4v in,5v output,the max output is still 800mA?

Thanks!

  • 0
    TI__Expert 7110 points
    1. The 1800mA Switch Current Limit (typ.) is the limit of the inductor current. In this case it's the average current through the inductor.
      In a DC/DC Stage in theory, the switch current is the output current (buck) or the input current (boost). Due to real effects and especially at extreme duty-cycles in boost, this value decreases.
    2. The datasheet shows the typical output current characteristic vs. input voltage in Figure1 (page 6). Here you can see the difference of several output voltage options.