Measured DC-DC converter efficiency vs. input power at V BAT = 1.2 V

Support Ultra Low Voltage Startup: Input Voltage Range 0.9V to 5.5V, the dc to dc step up converter is suited for alkaline battery Li-ion or Lipolymer

QEBIDUM DC DC Boost Converter,0.9V-3V to 3.3V, 0.9V-4.5V to 5V Synchronous Switching Regulator Mini DIY Adjustable Ultra Low Voltage Step Up Booster

PDF) A DC-DC Converter Efficiency Model for System Level Analysis in Ultra Low Power Applications

5V UPS Power Diy Board Charger & Step-up DC DC Converter Module 3.7V Li-ion LiPo

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W Series Datasheet by Bel Power Solutions

Full article: Critical Performance Comparison Between Single-Stage and Two-Stage Incremental Conductance MPPT Algorithms for DC/DC Boost-Converter Applied in PV Systems

ADP1108 Micropower DC-DC Converter Adjustable and - ZMiTAC

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PDF) A DC-DC Converter Efficiency Model for System Level Analysis in Ultra Low Power Applications

LTC3552 Datasheet by Analog Devices Inc.

NCP5623C Datasheet