SLUSE53 December 2024 BQ25751
PRODUCTION DATA
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In some applications, a regulated system voltage is required when the adapter power is removed. The device integrates an auto-reverse function which provides a regulated system voltage using the buck-boost converter in reverse direction once the input power is removed.
When enabled by setting the AUTO_REV register bit to 1, Auto Reverse mode can be used to provide a regulated system voltage immediately after the input power is removed. The device transitions to reverse mode with the BATFET off and the converter on when the input falls below the ACUV threshold.
The Auto Reverse mode operation will be automatically enabled if the following conditions are valid:
While the Auto reverse mode is active, the device sets the REVERSE_STAT bit to 1. Host can disable the Auto reverse operation at any time by setting EN_AUTO_REV = 0 and EN_REV = 0. The device then disables the converter, and turns the BATFET on to connect the battery directly to the system.