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BQ7940EVM - Why Schottky diode are used even when they have high leakage current

Girish Gangadharaiah
Intellectual 515 points
Other Parts Discussed in Thread: BQ76940EVM

Hey Everyone,

I wanted to use BQ7940 in my design, so want to understand few things, So I observed in SCHEMATICs of BQ76940EVM that Schottky diode (D32-D37 & D16-D21) are used even with high leakage current, Which will have huge impact during SHUTDOWN mode.

Please help me understand the same.

I am not able to attach the SCHEMATIC, It is available at " http://www.ti.com/lit/ug/slvu925b/slvu925b.pdf " 

  • 0
    TI__Expert 6085 points
    D16 to D21 and D32 to D37 are patterns for Schottky diodes. When the battery is short circuited, the cell voltages will drop and the inputs are pulled below the group power reference pin and current flows from the inputs. If this causes problems, diodes at these locations would conduct to prevent high current from the input pins