BQ25171-Q1 Series

Automotive, 800-mA linear battery charger for 1- to 2-cell Li-ion, LiFePO4, and 1- to 6-cell NiMH

Catalog

Automotive, 800-mA linear battery charger for 1- to 2-cell Li-ion, LiFePO4, and 1- to 6-cell NiMH

Part	Fault Protection	Voltage - Supply (Max) [Max]	Package / Case	Battery Chemistry	Operating Temperature [Min]	Operating Temperature [Max]	Number of Cells [Min]	Number of Cells [Max]	Supplier Device Package	Qualification	Programmable Features	Battery Pack Voltage	Mounting Type	Charge Current - Max [Max]	Current - Charging	Grade
Texas Instruments BQ25171QWDRCRQ1	Over Current Over Temperature Over Voltage Short Circuit	18 V	10-VFDFN Exposed Pad	Lithium Ion/Polymer	-40 °C	125 ¯C	1	6	10-VSON (3x3)	AEC-Q100	Current Timer	10.5 V	Surface Mount Wettable Flank	800 mA	Constant - Programmable	Automotive

Catalog

Automotive, 800-mA linear battery charger for 1- to 2-cell Li-ion, LiFePO4, and 1- to 6-cell NiMH

Key Features

• AEC-Q100 qualified for automotive applicationsTemperature grade 1: –40°C ≤ TA≤ 125°CHBM ESD classification level 2CDM ESD classification level C4B40-V load-dump tolerant to support charging back-up battery directly from main battery, 3-V to 18-V operatingAutomatic Sleep Mode for low power consumption350-nA battery leakage current2-µA input leakage current when charge disabledSupport multi-chemistry battery1- to 2-cell Li-Ion, Li-Poly, and LiFePO41- to 6-cell NiMH with intermittent-charging supportExternal resistor programmable operationVSET to set battery regulation voltage from 3.5 V to 8.4 V for Li-Ion, or 1- to 6-cell for NiMHISET to set charge current from 10 mA to 800 mACHM_TMR to set battery chemistry as Li+ or NiMH, and charge timer durationHigh accuracy±0.5% charge voltage accuracy±10% charge current accuracyCharging featuresPrecharge current 20% of ISETTermination current 10% of ISETNTC thermistor input to monitor battery temperatureCEpin for charging function controlTwo Open-drain output for status and fault indicationIntegrated fault protection18-V IN overvoltage protectionVSET based OUT overvoltage protection1000-mA overcurrent protection125°C thermal regulation; 150°C thermal shutdown protectionOUT short-circuit protectionVSET, ISET, CHM_TMR pins short/open protectionAEC-Q100 qualified for automotive applicationsTemperature grade 1: –40°C ≤ TA≤ 125°CHBM ESD classification level 2CDM ESD classification level C4B40-V load-dump tolerant to support charging back-up battery directly from main battery, 3-V to 18-V operatingAutomatic Sleep Mode for low power consumption350-nA battery leakage current2-µA input leakage current when charge disabledSupport multi-chemistry battery1- to 2-cell Li-Ion, Li-Poly, and LiFePO41- to 6-cell NiMH with intermittent-charging supportExternal resistor programmable operationVSET to set battery regulation voltage from 3.5 V to 8.4 V for Li-Ion, or 1- to 6-cell for NiMHISET to set charge current from 10 mA to 800 mACHM_TMR to set battery chemistry as Li+ or NiMH, and charge timer durationHigh accuracy±0.5% charge voltage accuracy±10% charge current accuracyCharging featuresPrecharge current 20% of ISETTermination current 10% of ISETNTC thermistor input to monitor battery temperatureCEpin for charging function controlTwo Open-drain output for status and fault indicationIntegrated fault protection18-V IN overvoltage protectionVSET based OUT overvoltage protection1000-mA overcurrent protection125°C thermal regulation; 150°C thermal shutdown protectionOUT short-circuit protectionVSET, ISET, CHM_TMR pins short/open protection

Description

The BQ25171-Q1 is an automotive rated, 800-mA linear charger for 1-cell and 2-cell Li-Ion, Li-Polymer, and LiFePO4, in addition to 1-cell up to 6-cell NiMH battery applications.The device has a single power output that charges the battery. The system load can be placed in parallel with the battery, as long as the average system load does not prevent the battery from charging fully within the safety timer duration. When the system load is placed in parallel with the battery, the charge current is shared between the system and the battery. The device has three phases for charging a Li-Ion battery: precharge to recover a fully discharged battery, fast-charge constant current to supply the bulk of the charge, and voltage regulation to reach full capacity. The device charges a NiMH in constant current mode only, and terminates the charge cycle when the programmable timer expires or the battery voltage exceeds the VOUT_OVP threshold.In all charge phases, an internal control loop monitors the IC junction temperature and reduces the charge current if an internal temperature threshold, TREG, is exceeded. The BQ25171-Q1 is an automotive rated, 800-mA linear charger for 1-cell and 2-cell Li-Ion, Li-Polymer, and LiFePO4, in addition to 1-cell up to 6-cell NiMH battery applications.The device has a single power output that charges the battery. The system load can be placed in parallel with the battery, as long as the average system load does not prevent the battery from charging fully within the safety timer duration. When the system load is placed in parallel with the battery, the charge current is shared between the system and the battery. The device has three phases for charging a Li-Ion battery: precharge to recover a fully discharged battery, fast-charge constant current to supply the bulk of the charge, and voltage regulation to reach full capacity. The device charges a NiMH in constant current mode only, and terminates the charge cycle when the programmable timer expires or the battery voltage exceeds the VOUT_OVP threshold.In all charge phases, an internal control loop monitors the IC junction temperature and reduces the charge current if an internal temperature threshold, TREG, is exceeded.