Fundamentals of MC13892 charger operation

Here's a detailed explanation of the basics of the charger operation of MC13892 (PMIC for i.MX series). This document provides a checklist for charger troubleshooting that can be used during the design stage.

The MC13892 incorporates a classic linear type CCCV charger, with two or three external MOSFETs and two sensing resistors. The charger provides a total current, which is shared between the system and the battery. Higher system consumption current leads to lower battery charging current, hence longer charging completion time. In extreme cases when the system consumption current is larger than the total current, the battery will supply the rest of the current, beyond what the charger can provide. Thus, the battery is actually discharging.

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Originally published by Freescale Semiconductor Inc. at www.freescale.com as "MC13892 Charger Operation".