Packaging information
| Package | Pins WQFN (RUY) | 28 |
| Operating temperature range (°C) -40 to 85 |
| Package qty | Carrier 250 | SMALL T&R |
Features for the BQ24800
- Hybrid Power Boost Mode to power
up system from adapter and battery together
- Ultra-fast transient response of 150µs to enter Hybrid Power Boost Mode
- Battery Only Boost Mode to support larger system transients and extend battery run time
- Peak power two-level input current limit to maximize the power from adapter and minimize battery discharge
- Charge 1- to 4-cell battery pack from 4.5V to 24V adapter
- High accuracy power and current
monitoring for CPU throttling
- Comprehensive PROCHOT profile
- ± 2% Current monitor accuracy
- ± 5% System Power Monitor Accuracy (PMON)
- Automatic NMOS power source
selection from adapter or battery
- ACFET Fast turn on in 100µs when exiting learn mode from battery removal
- Programmable input current,
charge voltage, charge and discharge current limit
- ±0.4% Charge voltage (16mV/step)
- ±2% Input current (64mA/step)
- ±2% Charge current (64mA/step)
- ±2% Discharge current (512mA/step)
- High integration
- Battery LEARN function
- Battery present monitor
- Boost Mode indicator
- Loop compensation
- BTST Diode
- Enhanced safety features for overvoltage protection, overcurrent protection, battery, inductor, and MOSFET short-circuit protection
- Switching frequency: 300kHz, 400kHz, 600kHz, and 800kHz
- Realtime system control on ILIM pin to limit charge and discharge current
- 0.65mA Adapter standby quiescent current for Energy Star
Description for the BQ24800
The BQ24800 device is a high-efficiency, synchronous buck multi-chemistry battery charger supporting 1-, 2-, 3-, or 4-series Li+ cells, or other battery chemistries up to 19.2V.
Through SMBus, a host microcontroller programs charge current, charge voltage, input current limit and discharge current limit with high regulation accuracies. Additionally, the BQ24800 supports a two level input current limit (Peak Power mode) to fully utilize the adapter capabilities and reduce battery discharge. The BQ24800 provides adapter current (IADP), battery discharge current (IDCHG), and system power (PMON) signals to the host microcontroller and outputs the PROCHOT signal to throttle back CPU speed when needed.
The BQ24800 supports hybrid power boost mode to boost the battery voltage to supplement the adapter when system power demand is temporarily higher than the adapter is able to provide. When the adapter is not present, the BQ24800 supports battery only boost mode to boost the battery voltage above the minimum system operating voltage, providing more headroom to support system transients.