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BQ25703A: bq25703A / Remove external components

S.Satoshi
Guru 21685 points
Part Number: BQ25703A

Hi,

The customer want to reduce external components of bq25703A because their board space is always limited. Please give your comment if following components can be removed.

  1. The small capacitor is added to the gate of LS FET that is C19 and C20 in EVM. Please let me know the purpose of these capacitor and can be removed or not.
  2. I understand that the capacitor between IADPT and GND is filter capacitor. Can it be removed if they don't use buffered adapter current output?
  3. I also understand the capacitor between ILIM_HIZ and GND is filter capacitor. I know that it needs to reduce the noise on ILIM_HIZ, but it may be depend on customer's design and environment. 
  4. And also can the resistor between IADPT and GND be removed? I know that this resistor is necessary to read inductor value but I don't understand why bq25703A need to know inductor value. Please let me know what problem is happened if it's removed.

Best Regards,

Satoshi / Japan Disty

  • 0
    TI__Guru 56650 points
    1. The gate capacitor of LS FET can control the boost mode switching node dv/dt which is related to the noise level.
    2. IADPT is an output pin. The capacitor can be removed.
    3. I want to keep a small capacitor between ILIM_HIZ and GND.
    4. We have to keep the resistor between IADPT and GND in a right value. The inductor value is for the inductor current estimating.