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The MIC2954 is a “bulletproof” efficient voltage regulator with very low dropout voltage (typically 40mV @ light loads and 375mV @ 250mA), and low quiescent current (120µA typical). The quiescent current of the MIC2954 increases only slightly in dropout, thus prolonging battery life. Key MIC2954 features include protection against reversed battery, fold-back current limiting, and automotive load dump protection (60V positive transient). Features • High-accuracy 5V, guaranteed 250mA output • Low quiescent current • Low dropout voltage • Extremely tight load and line regulation • Very low temperature coefficient • Current and thermal limiting • Input can withstand –20V reverse battery and+60V positive transients • Error flag warns of low output voltage • Logic-controlled electronic shutdown • Output programmable from 1.24V to 29V (MIC2954-07/08) • Available in TO-220, TO-92, and surface-mount SOT- 223 and SOIC-8 packages

The LM5017SD/NOPB is a synchronous buck regulator from Texas Instruments. It is a high-efficiency, low-noise, adjustable switching regulator that can deliver up to 0.6A of output current. It is designed to operate from a wide input voltage range of 4.5V to 36V and can be used to generate output voltages as low as 0.8V. The LM5017SD/NOPB is housed in an 8-pin WSON package and is ideal for applications such as point-of-load regulation, battery charging, and LED lighting.