The MAX1523EUT-T from Analog Devices Inc./Maxim Integrated is a simple boost controller Integrated Circuit for boost, flyback and SEPIC regulator designs, with positive output step-up and step-up/step-down DC-DC control, in a SOT-23-6 package.
The MAX1523EUT+G05 from Analog Devices Inc./Maxim Integrated is a regulator output DC-DC controller Integrated Circuit in a SOT23-6 package, with MULT TOP as a further code.