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BQ24650: Maximum input current on STAT1 and STAT2 pins

Nicholas Carley
Genius 10305 points
Part Number: BQ24650


Hello,

In the datasheet, a 10k resistor is used with an LED on the STAT pins for notifications. We'd like to use a 1k resistor instead to increase the brightness on our LEDs.

The datasheet doesn't call out a maximum sink current for the STAT pins. We are using Vref as the source which is 3.3V, through a 1k resistor, which is 3.3mA load. 

Can the STAT pins sink 3.3mA of current?

Thanks,

Nick

  • 0
    TI__Mastermind 24075 points
    Hi Nicholas,
    In the datasheet, the pull-up voltage source of the 10k STAT resistors is VIN (5V to 28V). For your application, using VREF = 3.3V as pull-up source is fine. The current into STAT will be (VREF - Vfwd)/1k, where Vfwd is the forward voltage drop of the LED diode. As an example, Using the diode from the user guide (Vfwd = 2.1V) the current would be (3.3-2.1)/1k = 1.2mA which STAT can sink.