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BQ24133 器件是一款高度集成的独立型锂离子及锂聚合物开关模式电池充电器，集成了两个 N 沟道功率 MOSFET。该器件提供一个恒定频率同步 PWM 控制器，可对输入电流、充电电流和电压进行高精度调节。BQ24133 可严密监测电池包温度，仅允许在预设的温度范围内充电。BQ24133 可为一节、两节或三节电池（由 CELL 引脚选择）充电，充电至每节电池具有 4.2V 固定电压。

The BQ24133 charges the battery in three phases: preconditioning, constant current, and constant voltage.

The BQ24133 provides power path selector gate driver ACDRV/CMSRC on input NMOS pair ACFET (Q1) and RBFET (Q2), and BATDRV on a battery PMOS device (Q3). When the qualified adapter is present, the system is directly connected to the adapter. Otherwise, the system is connected to the battery. In addition, the power path prevents battery from boosting back to the input.

The BQ24133 charges the battery from a DC source as high as 17 V, including a car battery. The input overvoltage limit is adjustable through the OVPSET pin. The AVCC, ACP, and ACN pins have a 30-V rating. When a high-voltage DC source is inserted, Q1 and Q2 remain off to avoid high-voltage damage to the system.

For 1-cell applications where the battery is not removable, the system can be directly connected to the battery to simplify the power path design and reduce the cost. With this configuration, the battery can automatically supplement the system load if the adapter is overloaded.

The BQ24133 is available in a 24-pin, 5.5-mm × 3.5-mm thin VQFN package.