225 mA buck for point-of-load rails
The MAX640ESA+ is a step-down (buck) switching regulator from Analog Devices, delivering up to 225 mA from a single positive output. It accepts an input rail between 4 V and 11.5 V, making it a fit for 5 V or 9 V intermediate buses common in industrial and telecom boards.
Output voltage options and load fit
The output can be set to an adjustable voltage down to 1.3 V, or configured for a fixed 3.3 V output — the fixed version simplifies the BOM by eliminating the external resistor divider. At 225 mA, this regulator suits light point-of-load rails for MCUs, sensors, or low-power logic that need a clean, regulated supply from a higher bus voltage. It does not include a synchronous rectifier, so the external Schottky diode carries the freewheeling current — budget the diode's forward drop and thermal dissipation in the layout, especially at higher input-to-output differentials.
Package and board integration
Supplied in tube packaging, it is suited for low-to-medium volume assembly or prototyping; for reel quantities, confirm the tube-to-reel conversion with the distributor at RFQ.