BQ25170J Series
800-mA JEITA-compliant linear battery charger for 1-cell Li-Ion and LiFePO4
Manufacturer: Texas Instruments
Catalog
800-mA JEITA-compliant linear battery charger for 1-cell Li-Ion and LiFePO4
| Part | Number of Cells | Battery Chemistry | Operating Temperature [Min] | Operating Temperature [Max] | Interface | Battery Pack Voltage | Supplier Device Package | Programmable Features | Charge Current - Max [Max] | Mounting Type | Package / Case | Current - Charging | Fault Protection |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
 Texas Instruments | 1 | Lithium Ion/Polymer Lithium Iron Phosphate | -40 °C | 125 ¯C | USB | 4.4 V | 8-WSON (2x2) | Current Timer Voltage | 800 mA | Surface Mount | 8-WFDFN Exposed Pad | Constant - Programmable | Over Current Over Temperature Over Voltage Short Circuit |
 Texas Instruments | 1 | Multi-Chemistry | -40 °C | 125 ¯C | 4.4 V | 8-WSON (2x2) | Current Voltage | 800 mA | Surface Mount | 8-WFDFN Exposed Pad | Constant - Programmable | Over Current Over Temperature Over Voltage Short Circuit |
Key Features
• Input voltage up-to 30-V tolerantAutomatic Sleep Mode for low power consumption350-nA battery leakage current80-µA input leakage current when charge disabledSupports 1-cell Li-Ion, Li-Polymer, and LiFePO4External resistor programmable operationVSET to set battery regulation voltage:Li-Ion: 4.05 V, 4.1 V, 4.2 V, 4.35 V, 4.4 VLiFePO4: 3.5 V, 3.6 V, 3.7 VISET to set charge current from 10 mA to 800 mAHigh accuracy±0.5% charge voltage accuracy±10% charge current accuracyCharging featuresPrecharge current 20% of ISETTS pin for charging operation control over JEITA rangeTermination current 10% of ISETNTC thermistor input to monitor battery temperaturepin for charging function controlOpen-drain output for status and fault indicationOpen-drain output for power good indicationIntegrated fault protection6.6-V IN overvoltage protectionVSET based OUT overvoltage protection1000-mA overcurrent protection125°C thermal regulation; 150°C thermal shutdown protectionOUT short-circuit protectionVSET, ISET pins short/open protectionInput voltage up-to 30-V tolerantAutomatic Sleep Mode for low power consumption350-nA battery leakage current80-µA input leakage current when charge disabledSupports 1-cell Li-Ion, Li-Polymer, and LiFePO4External resistor programmable operationVSET to set battery regulation voltage:Li-Ion: 4.05 V, 4.1 V, 4.2 V, 4.35 V, 4.4 VLiFePO4: 3.5 V, 3.6 V, 3.7 VISET to set charge current from 10 mA to 800 mAHigh accuracy±0.5% charge voltage accuracy±10% charge current accuracyCharging featuresPrecharge current 20% of ISETTS pin for charging operation control over JEITA rangeTermination current 10% of ISETNTC thermistor input to monitor battery temperaturepin for charging function controlOpen-drain output for status and fault indicationOpen-drain output for power good indicationIntegrated fault protection6.6-V IN overvoltage protectionVSET based OUT overvoltage protection1000-mA overcurrent protection125°C thermal regulation; 150°C thermal shutdown protectionOUT short-circuit protectionVSET, ISET pins short/open protection
Description
AI
The BQ25170J is an integrated 800-mA linear charger for 1-cell Li-Ion, Li-Polymer, and LiFePO4batteries targeted at space-limited portable 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.
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 charger power stage and charge current sense functions are fully integrated. The charger function has high accuracy current and voltage regulation loops, charge status display, and automatic charge termination. The charge voltage and fast charge current are programmable through external resistors. The precharge and termination current threshold track the fast charge current setting.
The BQ25170J is an integrated 800-mA linear charger for 1-cell Li-Ion, Li-Polymer, and LiFePO4batteries targeted at space-limited portable 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.
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 charger power stage and charge current sense functions are fully integrated. The charger function has high accuracy current and voltage regulation loops, charge status display, and automatic charge termination. The charge voltage and fast charge current are programmable through external resistors. The precharge and termination current threshold track the fast charge current setting.