Pololu Adjustable 9-30V Step-Up/Step-Down Voltage Regulator S18V20AHV

Pololu Adjustable 9–30?V Step-Up/Step-Down Voltage Regulator (S18V20AHV, item #2573) is a compact SEPIC-based DC DC converter that accepts input voltages from 2.9?V to 30?V and outputs an adjustable voltage between 9?V and 30?V at up to around 2?A (when input and output voltages are close) Measuring just 1.7? ª 0.825? ª 0.38?, it boasts 80–90% efficiency, reverse-voltage protection, over-current safety, thermal shutdown (~165?°C), and under voltage lockout below ~2.5?V. An ENABLE pin lets you disable the regulator, reducing quiescent current to mere microamps. Its versatility makes it ideal for battery-powered systems where input voltage can fluctuate above or below desired output, for example, extending the usable range of 9?V batteries or boosting low-voltage cell packs