Electrical Characteristics (Notes 2, 8) (Continued)
Note 10: The maximum total output current for the LM27966 should be limited to 180mA. The total output current can be split among any of the three banks (IDxA
=IDxC = 30mA Max.). Under maximum output current conditions, special attention must be given to input voltage and LED forward voltage to ensure proper current
regulation. See the Maximum Output Current section of the datasheet for more information.
Note 11: For the Main Display group of outputs on a part, the following are determined: the maximum output current in the group (MAX), the minimum output current
in the group (MIN), and the average output current of the group (AVG). Two matching numbers are calculated: (MAX-AVG)/AVG and (AVG-MIN)/AVG. The largest
number of the two (worst case) is considered the matching figure for the bank. The typical specification provided is the most likely norm of the matching figure for
all parts.
Note 12: For each IDxx output pin, headroom voltage is the voltage across the internal current sink connected to that pin. For Main and Aux outputs, VHR =VOUT
-VLED. If headroom voltage requirement is not met, LED current regulation will be compromised.
Note 13: SCL and SDIO signals are referenced to VIO and GND for minimum VIO voltage testing.
Note 14: SCL and SDIO should be glitch-free in order for proper brightness control to be realized.
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