LTC3109EGN#PBF

Power Management - Specialized Overview

The LTC3109EGN#PBF is a highly integrated DC/DC boost converter and power management IC designed for energy harvesting applications. It features an automatic polarity topology capable of operating from input voltages as low as ±30mV, enabling energy collection from thermoelectric generators (TEGs) with minimal temperature differentials. The device integrates a 2.2V LDO, a pin-selectable main output voltage (2.35V, 3.3V, 4.1V, or 5V), a switchable second output, and power-good indication. It supports external energy storage via capacitors or rechargeable batteries to ensure continuous system operation during intermittent energy availability.

Power Management - Specialized Feature Summary

• Automatic polarity topology enables operation from extremely low input voltages regardless of source polarity
• Integrated complete power management solution including pin-selectable main output and dedicated 2.2V LDO
• Supports external energy storage management for uninterrupted system performance during energy gaps

Power Management - Specialized Applications

• Powering remote wireless sensor nodes
• Energy harvesting systems utilizing thermoelectric generators
• Data acquisition circuits in building automation
• Industrial sensing equipment requiring maintenance-free power sources

Power Management - Specialized Procurement Notes

Verify the specific suffix EG indicates the commercial temperature grade and tube packaging configuration. Confirm that the pin-selectable output voltage matches the required application level by checking the hardware connection on the VOUT_SEL pin. Ensure the design accounts for the small QFN package thermal requirements and the specific inductor specifications recommended in the official datasheet for optimal efficiency.

Power Management - Specialized Selection Notes

Select this component when designing systems powered by ultra-low voltage sources such as TEGs or piezoelectric harvesters. It is suitable for applications requiring a compact, single-component power solution that manages both conversion and storage. Consider the pin-selectable output options to simplify board design compared to adjustable regulators. Verify compatibility with the intended microcontroller supply voltage provided by the integrated LDO.

Power Management - Specialized Part Context

The LTC3109 belongs to Analog Devices' family of energy harvesting power management ICs. It was developed in collaboration with EnOcean GmbH specifically for battery-less wireless sensor applications. The device distinguishes itself through its ability to start up from millivolt-level inputs, addressing the challenge of powering devices in environments where traditional batteries are impractical or require frequent replacement.

Power Management - Specialized Replacement Considerations

No public confirmed substitute part numbers are available.