I used both the TPS610986 and TPS61291 boost converter in order to power a load that consumes around 200mA in both situations (TPS610986 powering the load then use the TPS61291 to power the same load). The boost converter voltage drops down to around 0.45V. Both of them work correctly with load that consume 10-20mA, but with higher load the voltage drops down. I didn't understand the reason as the datasheet mention that both could work fine by supplying 200mA.

(I also tried a load that consume 100mA but i faced the same problem)
Input voltage: 3V
Output voltage: 3.3V
Could you please tell me how to fix it?

PS: attached the schematic of both boost converter that I used

enter image description here

  • \$\begingroup\$ How much current can the input voltage (3 volt) supply? \$\endgroup\$ – Andy aka Jan 27 '20 at 10:14
  • \$\begingroup\$ It's a power supply it could output any current but i am limiting the max output current to 250mA \$\endgroup\$ – fedi makni Jan 27 '20 at 10:15
  • \$\begingroup\$ Are you operating each boost converter separately or are they connected to the same load? \$\endgroup\$ – vtolentino Jan 27 '20 at 10:17
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    \$\begingroup\$ There are some power supply that allow you to fix the output voltage and the maximum output current for safety reason \$\endgroup\$ – fedi makni Jan 27 '20 at 10:43
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    \$\begingroup\$ Show us the layout of the PCB, did you follow PCB layout examples as in the datasheet? Did you use the recommended components? What is the saturation current of the inductors? \$\endgroup\$ – Bimpelrekkie Jan 27 '20 at 13:42

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