The MAX639/MAX640/MAX653 step-down switching regulators provide high efficiency over a wide range of load currents, delivering up to 225mA.
The MAX639, MAX640 and MAX653 are step‑down switching regulators that provide high efficiency over a wide range of load currents, delivering up to 225 mA. They operate from an input range of 4 V to 11.5 V and offer preset output voltages of 5 V, 3.3 V and 3 V, or an adjustable output from 1.3 V to the input voltage.
The document includes absolute maximum ratings, electrical characteristics, typical operating curves, pin descriptions, layout recommendations and inverter configurations. It also provides ordering information for the various package options and design tips for low‑quiescent‑current applications.
| Input Voltage Range | 4 V to 11.5 V |
|---|---|
| Maximum Output Current | 225 mA |
| Quiescent Current (Shutdown) | 10‑20 µA |
The converters operate from 4 V up to 11.5 V input.
They can supply up to 225 mA of output current.