LP50xx scales up the reference current (IREF) set by the external resistor (RIREF) to sink the output current (IOUT) at each output port. The following formula can be used to calculate the external resistor (RIREF):
The SCL and SDA lines must each have a pullup resistor placed somewhere on the line (the pullup resistors are normally located on the bus master). In typical applications, values of 1.8 kΩ to 4.7 kΩ are used.
VCAP is internal LDO output pin. This pin must be connected through a 1-µF capacitor to GND. Place the capacitor as close to the device as possible.
TI recommends having a 1-µF capacitor between VCC and GND to ensure proper operation. Place the capacitor as close to the device as possible.