LTC3106 IoT Energy Harvester PCB settings
LTC3106 IoT Energy Harvester PCB settings
Luislab.com
Programming the LTC3106 custom PCB settings I've made a custom PCB for the LTC3106 (QFN-20) allowing its key features to be programmed by adjusting some Jumpers, the Potentiometers (VR1 and VR2) and the value of R2.
JP1 – Programmable output voltage (VOUT) 1.8V
2.2V
3.3V
5V
JP2 – Maximum Power Point Control (MPPC) Disabled
Enabled
When the MPPC is enabled, set the optimal input voltage operating point by adjusting VR2 (VR2 is configured as a variable resistor with R2 in series). To set a precise resistance value for MPP, the jumper JP2 must be removed, then adjust the VR2 value by measuring its resistance between the CCW/Input Pin (top-right corner in the PCB) and the Wiper/Output Pin (middle), then add the R2 value.
LTC3106 IoT Energy Harvester PCB settings
Luislab.com
JP3 – Battery backup over and under voltage threshold The custom PCB for this project was designed to connect to VSTORE (J1) rechargeable batteries only. Use the most suitable Over Voltage (OV), Under Voltage (UV) setting for your needs when connecting a Supercapacitor as a backup battery.
Li Carbon
2x Rechargeable NiMH
Rechargeable Li Coin Cell
Li Polymer/Graphite
Over Voltage: 4V Under Voltage: 2.78V
Over Voltage: 2.9V Under Voltage: 1.9V
Over Voltage: 3V Under Voltage: 2.15V
Over Voltage: 4V Under Voltage: 3V
JP4 – Current limit input select (ILIMSEL) Low current
High current
VIN (J2) PEAK ILIMIT 100mA VSTORE (J1) PEAK ILIMIT 100mA
VIN (J2) PEAK ILIMIT 650mA VSTORE (J1) PEAK ILIMIT 170mA
JP5 – Input Turn ON/OFF Thresholds (RUN) Program a predictable regulator turn-on at a specified input voltage by adjusting VR1 (acting as a voltage divider). To set a precise resistance value for VR1, jumpers JP4 and JP5 must be removed then adjust the divider value by measuring its resistance (CW/Ground pin of the divider is the closest to JP3 in the PCB). VIN (J2)
VSTORE (J1)
VIN (J2): sets the turn ON/OFF threshold from the solar input VIN (J2) VSTORE (J1) : sets the turn ON/OFF threshold from the input VSTORE (J1)
All logos, brands, trademarks and registered trademarks are the property of their respective owners.
LTC3106 IoT Energy Harvester PCB settings
Luislab.com
JP6 – Isolation mode (VSTORE/VCAP) The custom PCB was designed to work in NONISOLATED mode only, so a jumper must be present on JP6 at all times. NONISOLATED
For more information on how the features work please refer to the project documentation and to www.linear.com/LTC3106
All logos, brands, trademarks and registered trademarks are the property of their respective owners.
Luislab.com
Programming the LTC3106 custom PCB settings I've made a custom PCB for the LTC3106 (QFN-20) allowing its key features to be programmed by adjusting some Jumpers, the Potentiometers (VR1 and VR2) and the value of R2.
JP1 – Programmable output voltage (VOUT) 1.8V
2.2V
3.3V
5V
JP2 – Maximum Power Point Control (MPPC) Disabled
Enabled
When the MPPC is enabled, set the optimal input voltage operating point by adjusting VR2 (VR2 is configured as a variable resistor with R2 in series). To set a precise resistance value for MPP, the jumper JP2 must be removed, then adjust the VR2 value by measuring its resistance between the CCW/Input Pin (top-right corner in the PCB) and the Wiper/Output Pin (middle), then add the R2 value.
LTC3106 IoT Energy Harvester PCB settings
Luislab.com
JP3 – Battery backup over and under voltage threshold The custom PCB for this project was designed to connect to VSTORE (J1) rechargeable batteries only. Use the most suitable Over Voltage (OV), Under Voltage (UV) setting for your needs when connecting a Supercapacitor as a backup battery.
Li Carbon
2x Rechargeable NiMH
Rechargeable Li Coin Cell
Li Polymer/Graphite
Over Voltage: 4V Under Voltage: 2.78V
Over Voltage: 2.9V Under Voltage: 1.9V
Over Voltage: 3V Under Voltage: 2.15V
Over Voltage: 4V Under Voltage: 3V
JP4 – Current limit input select (ILIMSEL) Low current
High current
VIN (J2) PEAK ILIMIT 100mA VSTORE (J1) PEAK ILIMIT 100mA
VIN (J2) PEAK ILIMIT 650mA VSTORE (J1) PEAK ILIMIT 170mA
JP5 – Input Turn ON/OFF Thresholds (RUN) Program a predictable regulator turn-on at a specified input voltage by adjusting VR1 (acting as a voltage divider). To set a precise resistance value for VR1, jumpers JP4 and JP5 must be removed then adjust the divider value by measuring its resistance (CW/Ground pin of the divider is the closest to JP3 in the PCB). VIN (J2)
VSTORE (J1)
VIN (J2): sets the turn ON/OFF threshold from the solar input VIN (J2) VSTORE (J1) : sets the turn ON/OFF threshold from the input VSTORE (J1)
All logos, brands, trademarks and registered trademarks are the property of their respective owners.
LTC3106 IoT Energy Harvester PCB settings
Luislab.com
JP6 – Isolation mode (VSTORE/VCAP) The custom PCB was designed to work in NONISOLATED mode only, so a jumper must be present on JP6 at all times. NONISOLATED
For more information on how the features work please refer to the project documentation and to www.linear.com/LTC3106
All logos, brands, trademarks and registered trademarks are the property of their respective owners.
