LP5562: current limiting resistors

Hi Sara,

     Q1: I'm curious if I need to add current limiting resistors in series with the LEDs. Should I be worried about too much power dissipation in the LED driver without the series resistors? 

     There is no need to add current limiting resistors. The current is controller by current sink. The resistors in series with the LEDs will produce the additional power loss.

     Q2: What's the typical voltage headroom needed on the LED pins?

     Please refer to the Saturation voltage in the datasheet page5 and figure10 in the datasheet page9.

     Q3: Are unused LED pins recommended to be let unconnected or connected to GND? 

     Please refer to the following thread.

     https://e2e.ti.com/support/power-management/f/196/t/698001?tisearch=e2e-sitesearch&keymatch=LP5562