LTC3109IUF#PBF

LTC3109IUF#PBF is a highly integrated DC/DC converter ideal for harvesting surplus energy from extremely low input voltage sources such as TEGs (thermoelectric generators) and thermopiles. Its unique, proprietary autopolarity topology allows it to operate from input voltages as low as 30mV, regardless of polarity. Using two compact step-up transformers and external energy storage elements, the LTC3109 provides a complete power management solution for wireless sensing and data acquisition. The 2.2V LDO can power an external microprocessor, while the main output can be programmed to one of four fixed voltages. The power good indicator signals that the main output is within regulation. Applications include remote sensor and radio power, HVAC systems, automatic metering, building automation, predictive maintenance, industrial wireless sensing.

• Proprietary auto-polarity architecture, power good indicator
• Less than ±1°C needed across TEG to harvest energy
• Uses compact step-up transformers, logic-controlled output
• Energy storage capability for operation during power interruption
• No-load input current is 6mA typical at (TA = 25°C)
• VOUT quiescent current is 0.2µA typical at (VOUT = 3.3V, VOUT2-EN = 0V)
• LDO load regulation is 0.5% typical at (0mA to 2mA load)
• LDO dropout voltage is 100mV typical at (ILDO = 2mA)
• Operating temperature range from -40°C to 125°C
• 20-lead plastic QFN package

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