Summary of BQ25100 – 250-mA Single Cell Li-Ion Battery Charger
The bq2510x series are compact linear Li-Ion/Li-Pol battery chargers for space-constrained devices, featuring high input voltage range with overvoltage protection, integrated power stage and current sensing, three-phase charging (conditioning, constant current, constant voltage), thermal current limiting, programmable precharge/termination and fast-charge currents via external resistors, and support for very low charge currents and ultra-low battery leakage.
Parts used in the bq25100 – 250-mA Single Cell Li-Ion Battery Charger:
- bq2510x series IC (example: bq25100)
- External resistor for programming pre-charge threshold
- External resistor for programming termination threshold
- External resistor for programming fast charge current
- Li-Ion or Li-Pol single-cell battery
- Input power source or adapter (unregulated supported)
- Optional system load in parallel with battery
Description
The bq2510x series of devices are highly integrated Li-Ion and Li-Pol linear chargers targeted at space-limited portable applications. The high input voltage range with input overvoltage protection supports low-cost unregulated adapters.
The bq2510x has a single power output that charges the battery. A system load can be placed in parallel with the battery as long as the average system load does not keep the battery from charging fully during the 10 hour safety timer.
The battery is charged in three phases: conditioning, constant current and constant voltage. In all charge phases, an internal control loop monitors the IC junction temperature and reduces the charge current if an internal temperature threshold is exceeded.
The charger power stage and charge current sense functions are fully integrated. The charger function has high accuracy current and voltage regulation loops and charge termination. The pre-charge current and termination current threshold are programmed via an external resistor on the bq2510x. The fast charge current value is also programmable via an external resistor.
Features
- Charging
- 1% Charge Voltage Accuracy
- 10% Charge Current Accuracy
- Supports Applications for Very Low
Charge Currents – 10 mA to 250 mA - Supports minimum 1-mA Charge Termination
Current - Ultra Low Battery Output Leakage Current –
Maximum 75 nA - Adjustable Termination and Precharge
Threshold - High voltage Chemistry Support: 4.35 V
with bq25100H/01H, 4.30 V with bq25100A
For more detail: BQ25100 – 250-mA Single Cell Li-Ion Battery Charger
- What charging phases does the bq2510x use?
It charges in three phases: conditioning, constant current, and constant voltage. - Can the bq2510x support very low charge currents?
Yes, it supports very low charge currents from 10 mA to 250 mA and minimum 1-mA charge termination current. - How are pre-charge and termination thresholds set?
Pre-charge and termination thresholds are programmed via an external resistor on the bq2510x. - Is thermal protection provided during charging?
Yes, an internal control loop monitors IC junction temperature and reduces charge current if a temperature threshold is exceeded. - Does the bq2510x include current sensing and power stage integration?
Yes, the charger power stage and charge current sense functions are fully integrated. - What input sources are supported?
The high input voltage range with input overvoltage protection supports low-cost unregulated adapters. - What is the battery output leakage current?
Battery output leakage current is ultra low, maximum 75 nA. - What accuracy does the charger provide for voltage and current?
It provides 1% charge voltage accuracy and 10% charge current accuracy. - Does the bq2510x allow a system load while charging?
Yes, a system load can be placed in parallel with the battery as long as the average load does not prevent full charging within the 10 hour safety timer. - What high-voltage chemistries are supported?
Supports 4.35 V chemistry with bq25100H/01H and 4.30 V with bq25100A.
