BQ21040 Series
1-cell, 0.8-A Li-ion and Li-polymer battery charger
Manufacturer: Texas Instruments
Link to Manufacturer Page: https://www.ti.com/
Catalog
1-cell, 0.8-A Li-ion and Li-polymer battery charger
| Part | Current - Charging | Interface | Package / Case | Voltage - Supply (Max) [Max] | Battery Pack Voltage | Mounting Type | Supplier Device Package | Fault Protection | Charge Current - Max [Max] | Operating Temperature [Min] | Operating Temperature [Max] | Battery Chemistry | Number of Cells | Supplied Contents | Contents | Secondary Attributes | Type | Function | Utilized IC / Part |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Texas Instruments BQ21040DBVT | Constant - Programmable | USB | SOT-23-6 | 6.45 V | 4.2 V | Surface Mount | SOT-23-6 | Over Temperature, Over Voltage, Short Circuit | 800 mA | 0 °C | 125 ¯C | Lithium Ion/Polymer | 1 | ||||||
Texas Instruments BQ21040DBVR | Constant - Programmable | USB | SOT-23-6 | 6.45 V | 4.2 V | Surface Mount | SOT-23-6 | Over Temperature, Over Voltage, Short Circuit | 800 mA | 0 °C | 125 ¯C | Lithium Ion/Polymer | 1 | ||||||
Texas Instruments BQ21040EVM-777 | Board(s) | Board(s) | On-Board LEDs | Power Management | Battery Charger | BQ21040 |
Key Features
• Charging1% Charge Voltage Accuracy10% Charge Current AccuracyLow Battery Leakage Current (1 µA)Programmable Charge Current using External Resistor up to 800 mA4.2-V Li-Ion and Li-Pol ChargerProtection30-V Input Rating; with 6.6-V Input Overvoltage ProtectionInput Voltage Dynamic Power Management125°C Thermal Regulation; 150°C Thermal Shutdown ProtectionOUT Short-Circuit Protection and ISET Short DetectionOvertemperature Sensing Protection Through NTCFixed 10-Hour Safety TimerSystemStatus Indication – Charging/DoneAvailable in Small SOT-23 PackageCharging1% Charge Voltage Accuracy10% Charge Current AccuracyLow Battery Leakage Current (1 µA)Programmable Charge Current using External Resistor up to 800 mA4.2-V Li-Ion and Li-Pol ChargerProtection30-V Input Rating; with 6.6-V Input Overvoltage ProtectionInput Voltage Dynamic Power Management125°C Thermal Regulation; 150°C Thermal Shutdown ProtectionOUT Short-Circuit Protection and ISET Short DetectionOvertemperature Sensing Protection Through NTCFixed 10-Hour Safety TimerSystemStatus Indication – Charging/DoneAvailable in Small SOT-23 Package
Description
AI
The bq21040 device is a highly integrated Li-Ion and Li-Pol linear battery charger device targeted at space-limited portable applications. The device operates from either a USB port or AC adapter. The high input voltage range with input overvoltage protection supports low-cost unregulated adapters.
The bq21040 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, charge status display, and charge termination. The pre-charge current and termination current threshold are fixed to 20% and 10%, respectively. The fast charge current value is programmable through an external resistor.
The bq21040 device is a highly integrated Li-Ion and Li-Pol linear battery charger device targeted at space-limited portable applications. The device operates from either a USB port or AC adapter. The high input voltage range with input overvoltage protection supports low-cost unregulated adapters.
The bq21040 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, charge status display, and charge termination. The pre-charge current and termination current threshold are fixed to 20% and 10%, respectively. The fast charge current value is programmable through an external resistor.