| A1 | IN | Regulator Supply Input Pin. Connect to a voltage between 1.8V and 5.5V and bypass with a 10µF capacitor from IN to GND. |
| A2 | LX | Switching Node Pin. Connect recommended inductor between LX and OUT. |
| A3 | GND | Ground Pin. Connect to application board GND. |
| B3 | RSEL/NC | MAX38650A: Connect a resistor from RSEL to GND to program the output voltage and IN undervoltage threshold based onTable 1.MAX38650B: The pin is no connect since the device is preprogrammed and should be left floating. |
| B2 | OUT | Output Voltage Pin. Connect to the load at a point where accurate regulation (output capacitor) is required to eliminate voltage drops. |
| B1 | EN | Enable Input Pin. Force this pin high to enable the buck converter. Force this pin low to disable the part and enter shutdown. |
