SOT-23-6 boost converter for low-voltage startup
The MCP16251T-I/CH is a step-up (boost) switching regulator from Microchip Technology, delivering an adjustable output from a minimum input of 0.82 V — low enough to start from a single alkaline cell or a Li-ion battery that has discharged to near-empty. Housed in a SOT-23-6 package, it integrates a 100 mA switch and synchronous rectifier, which eliminates the external Schottky diode typical in simpler boost topologies and improves efficiency at light loads.
Input range and switching behaviour
Switching at 500 kHz, the 100 mA switch current rating sets the practical output current ceiling — at 3.3 V out from a 2.5 V input, expect roughly 60-70 mA continuous before the switch current limit is reached.