Stand-alone or I²C-controlled 70-V bidirectional buck-boost charge controller with power path

The BQ25750 is a wide input voltage, switched-mode buck-boost Li-Ion, Li-polymer, or LiFePO 4 battery charge controller with direct power path control. The device offers high-efficiency battery charging over a wide voltage range with accurate charge current and charge voltage regulation, in addition to automatic charge preconditioning, termination, and charge status indication. The device integrates all the loop compensation for the buck-boost converter, thereby providing a high density solution with ease of use. In reverse mode, the device draws power from the battery and regulates the SYS terminal voltage.

Besides the I 2C host-controlled charging mode, the device also supports standalone charging mode via resistor programmable limits. Input current, charge current and charge voltage regulation targets can be set via the ILIMHIZ, ICHG and FB pins, respectively.

The device has three status pins (STAT1, STAT2, and PG) to indicate the charging status and input voltage status. These pins can be used to drive LEDs or communicate with a host processor. If needed, these pins can also be used as general purpose indicators and their status controlled directly by the I2C interface. The INT pin immediately notifies host when the device status changes, including faults.

The device also provides an analog-to-digital converter (ADC) for monitoring input current, charge current and input/battery/system/thermistor voltages.

The device comes with a 36-pin 5.0 mm × 6.0 mm QFN package with 0.5 mm pin pitch.