The BQ24800 BQ 24800 IC Battery Charge Controller 28 Pin is a 1–4 cell synchronous buck charger with SMBus control. It is often used in USB-C Type C adapter-based laptop power systems. It provides regulated charging, power path for system load, and protection features (OVP, OCP, thermal). It is simpler than the NVDC / buck-boost types but effective when the input voltage is always higher than battery voltage.
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BQ24800 BQ 24800 IC Battery Charge Controller 28 Pin
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Description
Specification
The BQ24800 BQ 24800 IC Battery Charge Controller 28 Pins provides hybrid power boost-mode to supply the system from both adapter and battery, with ultra-fast transient response (150 µs) and battery-only boost to extend runtime. It supports 1–4 cell packs charged from 4.5–24 V adapters, with peak two-level input current limiting to maximize adapter power and minimize battery discharge. High-accuracy monitoring enables CPU throttling with ±2 % current and ±5 % system power accuracy, while automatic NMOS selection quickly switches sources (ACFET turn-on 100 µs). Programmable limits include charge voltage (±0.4 %), input/charge/discharge current (±2 %), along with integrated features like battery LEARN, presence monitor, boost-mode indicator, loop compensation, and BTST diode. Safety is enhanced with overvoltage, overcurrent, battery, inductor, and MOSFET short-circuit protection. Switching frequencies of 300–800 kHz and real-time ILIM control ensure precise operation, with low adapter standby current (0.65 mA) for Energy Star compliance.
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