The bq25100B device is a highly integrated Li-Ion and Li-Pol linear charger targeted at space-limited portable applications. The high input voltage range with input overvoltage protection supports low-cost unregulated adapters.
The bq25100B 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 bq25100B. The fast charge current value is also programmable via an external resistor.
References to other devices in the bq25100B family are included in this document. For more information on those devices, please see their respective datasheets. This includes references to the CHG pin and the JEITA temperature functionality.
PART NUMBER | PACKAGE | BODY SIZE (NOM) |
---|---|---|
bq25100B | DSBGA (6) | 1.60 mm × 0.90 mm |
Changes from * Revision (May 2016) to A Revision
PART NUMBER | VO(REG) | VOVP | PreTerm /CHG | TS |
---|---|---|---|---|
bq25100 | 4.20 V | 6.5 V | PreTerm | TS (JEITA) |
bq25101 | 4.20 V | 6.5 V | CHG | TS (JEITA) |
bq25100A | 4.30 V | 6.5 V | PreTerm | TS |
bq25100B(2) | 4.284 V | 6.5 V | PreTerm | TS |
bq25100H | 4.35 V | 6.5 V | PreTerm | TS (JEITA) |
bq25101H | 4.35 V | 6.5 V | CHG | TS (JEITA) |
bq25100L(1) | 4.06 V | 6.5 V | PreTerm | TS |
PIN | I/O | DESCRIPTION | |
---|---|---|---|
NAME | NUMBER | ||
IN | A2 | I | Input power, connected to external DC supply (AC adapter or USB port). Expected range of bypass capacitors 1 μF to 10 μF, connect from IN to VSS. |
ISET | B2 | I | Programs the fast-charge current setting. External resistor from ISET to VSS defines fast charge current value. Recommended range is 13.5 kΩ (10 mA) to 0.54 kΩ (250 mA). |
OUT | A1 | O | Battery Connection. System Load may be connected. Expected range of bypass capacitors 1 μF to 10 μF. |
PRE-TERM | C1 | I | Programs the current termination threshold ( 1% to 50% of IOUT, 1 mA minimum). The pre-charge current is twice the termination current level. |
Expected range of programming resistor is 600 Ω to 30 kΩ (6k: ICHG/10 for term; ICHG/5 for precharge) | |||
TS | B1 | I | Temperature sense pin connected to 10k at 25°C NTC thermistor, in the battery pack. Floating TS pin or pulling high puts part in TTDM Charger mode and disables TS monitoring, Timers and Termination. Pulling pin low disables the IC. If NTC sensing is not needed, connect this pin to VSS through an external 10-kΩ resistor. A 250-kΩ resistor from TS to ground will prevent IC entering TTDM mode when battery with thermistor is removed. |
VSS | C2 | – | Ground pin |