SMBus 1-4 cell Buck battery charge controller to support hybrid power boost and battery boost mode
Product details
Parameters
Package | Pins | Size
Features
- Hybrid Power Boost Mode to power up system from adapter and battery together
- Ultra-fast transient response of 150 µs to enter Hybrid Power Boost Mode
- Battery Only Boost Mode to 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 4.5- to 24-V 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 100 µs when exiting learn mode from battery removal
- Programmable input current, charge voltage, charge and discharge current limit
- ±0.4% Charge voltage (16-mV/step)
- ±2% Input current (64-mA/step)
- ±2% Charge current (64-mA/step)
- ±2% Discharge current (512-mA/step)
- High integration
- Battery LEARN function
- Battery present monitor
- Boost Mode indicator
- Loop compensation
- BTST Diode
- Enhanced safety features for over-voltage protection, over-current protection, battery, inductor, and MOSFET short-circuit protection
- Switching frequency: 300 kHz, 400 kHz, 600 kHz, and 800 kHz
- Realtime system control on ILIM pin to limit charge and discharge current
- 0.65-mA Adapter standby quiescent current for Energy Star
Description
The BQ24800 device is a high-efficiency, synchronous buck battery charger, offering low component count for space-constrained, multi-chemistry battery charging applications.
The BQ24800 device supports hybrid power boost mode. Hybrid power boost mode boosts the battery up to the system voltage in order to supplement the adapter when system power demand is temporarily higher than the adapter is able to provide. The ultra-fast transition from battery charging to battery discharging prevents adapter crash from overloading condition.
The BQ24800 device also supports battery only boost mode when no adapter is present. When the battery voltage is above the minimum system operation voltage, the battery is directly connected to the system supply rail through BATFET. Once the battery voltage goes below the minimum system operation voltage, BQ24800 will turn on the boost mode to regulate the system supply rail, extending the system run time.
The BQ24800 device uses two charge pumps to separately drive N-channel MOSFETs (ACFET, RBFET, and BATFET) for automatic system power source selection.
Through SMBus, a system power management microcontroller programs input current, charge current, discharge current, and charge voltage DACs with high regulation accuracies.
The BQ24800 device monitors adapter current (IADP), battery discharge current (IDCHG), and system power (PMON) for host to throttle back CPU speed or reduce system power when needed.
The BQ24800 device charges 1-, 2-, 3-, or 4-series Li+ cells.
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Technical documentation
| Type | Title | Date | |
|---|---|---|---|
| * | Data sheet | BQ24800 SMBus 1- to 4-Cell Buck Battery Charge Controller With Peak Power, Hybrid Power Boost and Battery Only Boost Modes datasheet | Feb. 28, 2020 |
| User guide | BQ24800 EVM User's Guide | Feb. 12, 2020 | |
| Technical article | When to use rechargeable batteries in small battery applications | Oct. 01, 2019 | |
| Technical article | Should I use a linear charger or a switching charger? | Oct. 31, 2015 | |
| Technical article | Summertime and the livin' is easy | Jun. 20, 2014 |
Design & development
For additional terms or required resources, click any title below to view the detail page where available.Hardware development
Description
Features
- Host-controlled 2-S to 4-S battery buck charger with 3.2-V to 24-V input; 1-V to 19.2-V charging output
- Hybrid power boost mode to provide system power from adapter and battery simultaneously
- Peak power mode to optimize adapter utilization without discharging battery
- Battery-only boost mode to extend (...)
Software development
Features
- Real-time Gauge Dashboard for monitoring basic registers
- Full register access and logging
- Full data memory access and logging
- Product configuration and monitoring tools
- Import and export of product configurations
- Calibration and test automation
- Export of FS files for the target production environment
CAD/CAE symbols
| Package | Pins | Download |
|---|---|---|
| WQFN (RUY) | 28 | View options |
Ordering & quality
- RoHS
- REACH
- Device marking
- Lead finish/Ball material
- MSL rating/Peak reflow
- MTBF/FIT estimates
- Material content
- Qualification summary
- Ongoing reliability monitoring
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