This design note introduces the LTC®3526L, a 1MHz, 550mA synchronous step-up (boost) converter with a wide input voltage range of 0.7V to 5V and an output voltage range of 1.5V to 5.25V. Housed in a 2mm x 2mm DFN package, the LTC3526L has a typical startup voltage of just 700mV, with operation down to 400mV.