This power rail powers the System Management Controller (SMC). It converts 8.4V from the battery or 14.5V from the charger to 3.42V. U7090 is a low power 300mA buck converter chip. D7005 is used to prevent the 14.5V charger voltage to be delivered directly to the battery. Charger power also can go through R7005, D7005 to U7090. The always-on 3.42V power rail PP3V42_G3H can be created directly from an internal battery or Magsafe charger shown as below:īattery power goes through R7006, D7005 to U7090 the power management chip. At this level, in order to discuss in greater detail, we need to make use of schematic diagrams, here we will be taking the 820-3437 MacBook Air 2013 A1466 Intel Haswell CPU logic board as an example.ġ.
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