1. Input Connections:
   • VIN1 and VIN2: These should be connected to your energy harvesting sources (e.g., thermoelectric generators). Make sure they are correctly configured.
2. Decoupling Capacitors:
   • Proper placement of capacitors on power input pins to stabilize voltage and mitigate noise.
3. Output Configuration:
   • Ensure that VOUT is correctly configured with respect to the desired output voltage. This often involves setting VPRG1 and VPRG2 pins.
4. Ground Connections:
   • All ground pins (e.g., GND) should be correctly connected to a common ground.
5. Storage Capacitor:
   • VSTORE Pin: Correctly connect an appropriate capacitor to store excess harvested energy.
6. LDO Regulator:
   • LDO_OUT: Ensure this pin is correctly routed if you intend to use the Low Dropout Regulator.
7. Other Pins:
   • PGD, VREF, IRQ, SW, and others: These should be connected according to the specific functionality and application needs tailored to your project's requirements.

1. Power and Ground Connections:
   • Connect VIN1:1 to your energy harvesting source.
   • Connect VIN2:3 to your energy harvesting source.
   • Connect GND:2 to your ground plane.
2. Output Voltage Configuration:
   • Set VPRG1:10 and VPRG2:11 to achieve the desired output voltage by either tying to ground or leaving open (check specific configurations in the data sheet).
3. Capacitor Connections:
   • Connect C1+:4 to a capacitor (C1).
   • Connect C1-:5 to the other side of C1.
4. Energy Storage:
   • Connect VSTORE:8 to an appropriate storage capacitor (e.g., 1 µF or greater).
5. LDO Regulator:
   • Connect LDO_OUT:6 to the LDO regulator if needed.
6. Switching Regulator and Load Connection:
   • Connect SW:12 to the necessary components for the switching regulator.
   • Connect VOUT:9 to your load.
7. Other Functional Pins:
   • Check if any specific functionality needed, connect PGD:14, VREF:13, IRQ:15 accordingly.

• VIN1: Connect VIN1:1 to your energy harvesting source positive terminal.
• VIN2: Connect VIN2:3 to your energy harvesting source negative terminal.
• Ground: Connect GND:2 to your ground plane.
• Capacitor: Connect C1+:4 to one side of a capacitor, and C1-:5 to the other side of the same capacitor.
• Output Voltage Programming: Connect VPRG1:10 to GND (sets 3.3V output), leave VPRG2:11 open (adjust based on your desired output voltage).
• VSTORE: Connect VSTORE:8 to a storage capacitor (e.g., 10 µF).
• LDO Output: Connect LDO_OUT:6 to your load if using LDO.

1. Complete the Pin Connections: Start making the electrical connections in your Flux.ai project according to the example detailed connections above.
2. Component Values: Ensure the values of capacitors and other components are appropriate as per LTC3109’s datasheet and application notes.
3. Simulation and Validation: Once the connections are complete, simulate and check the circuit to validate functionality.

Diagram

• Ultra-low Input Voltage: Can operate from as low as 30mV, which is suitable for energy harvesting from thermoelectric generators $(TEGs)$ and thermopiles.
• Auto-Polarity Architecture: Functions regardless of the polarity of the input voltage.
• Output Voltage Selection: Selectable output voltages of 2.35V, 3.3V, 4.1V, or 5V.
• Low-Dropout Regulator: Includes a 2.2V LDO regulator.
• Logic Controlled Output: To facilitate easy integration with microcontrollers or other logic-level devices.
• Energy Storage: Ensures continuous operation through a brief power interruption.
• Compact Package: Encapsulated in a small, 20-lead $(4mm \times 4mm)$ QFN or SSOP package, suitable for space-constrained applications.
• Power Good Indicator: To signal the status of the output voltage.
• Use of Compact Step-Up Transformers: Enhanced efficiency for low-power energy harvesting systems.

• Voltage Input Range: 30mV to 500mV
• Operating Temperature Range: -40°C to 85°C
• Output Current Max: 26mA
• Output Voltage Range: 2.3V to 5.1V
• Quiescent Current: 0.2$\mu$A

• VIN1 and VIN2: Input voltages that can be fed from a thermoelectric generator.
• GND: Ground.
• VOUT: Output voltage pin.
• LDO_OUT: Output pin for the low-dropout regulator.
• VSTORE: Storage capacitor connection to maintain operation during power interruptions.
• VPRG1 and VPRG2: Voltage selection pins to set the output voltage.
• ENOUT2: Control logic output.
• IRQ: Interrupt request output.
• PGD: Power Good indicator.
• C1+ and C1-: Pins for the external energy storage capacitor.
• DCTR and DCA, DCB: Connections for compact step-up transformers.
• SW: Switching node for the step-up transformer.
• VREF: Reference voltage pin.

1. Input Connections:
   • Connect VIN1 and VIN2 to the thermoelectric generator.
   • Connect GND to the ground plane of the system.
2. Energy Storage Capacitor:
   • Connect C1+ and C1- to a suitable capacitor for energy storage.
3. Output Voltage:
   • Connect VOUT to the desired load.
   • Connect LDO_OUT to the load that requires regulated 2.2V.
4. Voltage Selection:
   • Connect VPRG1 and VPRG2 to select the desired output voltage.
5. Interrupt and Power Good:
   • Connect IRQ to an interrupt pin of the microcontroller.
   • Connect PGD to a digital input pin to monitor the power status.

• More specific components, resistors, capacitors, and transformers need to be chosen according to the application requirements.
• Implementation of feedback mechanisms, if needed, to stabilize the output.

• Ultra-low Input Voltage Operation: As low as 30mV.
• Auto-polarity Architecture: Operates regardless of input polarity, unique to LTC3109.
• Selectable Output Voltages: 2.35V, 3.3V, 4.1V, or 5V.
• 2.2V LDO Regulator: Low-dropout regulator.
• Logic-controlled Output: For effective control.
• Energy Storage System: Maintains operation during power interruptions.
• Power Good Indicator: Provides status of power availability.
• Compact Package: QFN or SSOP (4mm × 4mm) suitable for space-constrained applications.

• HVAC Systems
• Building Automation
• Industrial Wireless Sensing
• Thermoelectric Generators (TEGs)
• Thermopiles

• Manufacturer Name: Linear Technology Corporation
• Package or Case: QFN65P500X500X80-21WN
• Mounting Type: Surface Mount Technology (SMT)
• Operating Temperature Range: -40°C to 85°C
• Output Accuracy: 2 - 3%
• Maximum Output Current: 26mA
• Output Voltage Range: 2.30V to 5.10V
• Quiescent Current: 0.2µA
• Maximum Input Voltage: 500mV
• Minimum Input Voltage: 30mV

• Power and Ground:
  • VIN1 (Pin 1): Power input
  • VIN2 (Pin 3): Power input
  • GND (Pin 2): Ground
  • VREF (Pin 13): Reference voltage
• Output Pins:
  • VOUT (Pin 9): Main output voltage
  • LDO_OUT (Pin 6): LDO regulator output
  • VAUX (Pin 7): Auxiliary output
• Control Pins:
  • ENOUT2 (Pin 16): Enable output
  • VPRG1 (Pin 10): Voltage programming
  • VPRG2 (Pin 11): Voltage programming
  • IRQ (Pin 15): Interrupt request
  • PGD (Pin 14): Power Good Indicator
• Energy Storage and Switching:
  • VSTORE (Pin 8): Energy storage
  • SW (Pin 12): Switch
  • C1+/C1- (Pins 4/5): Capacitor connections

• Power Inputs:
  • Connect VIN1 $P_1$ and VIN2 $P_3$ to your energy harvesting source.
• Ground:
  • Connect GND $P_2$ to your ground plane.
• Main Output:
  • Connect VOUT $P_9$ to the load you intend to power.

1. Creating an Account:
   • Visit Flux Signup to create an account. Simply enter your username, email, and password. You can also create an account by linking your Google account.
2. Getting Help:
   • If you need help with Flux, the best place for support is the @support. Here, you can ask questions directly to the Flux team and connect with other engineers, designers, and hardware enthusiasts.
3. Learning Resources:
   • Explore the library of
     
     for crash courses and recorded events. Independent content creators also have great videos on how to use Flux.
4. Using the Simulation:
   • To learn how to use the simulator, check out this tutorial.
5. Positioning and Routing:
   • For a detailed guide on positioning and routing components in Flux, you can refer to the Positioning and Routing documentation.
6. Interactive Help:
   • When Copilot suggests specific connections on your schematic, you can have it perform those connections for you by clicking the "Take Action" button.