Synchronous Switch-mode 2-cell Li-ion charger w/2A FET, enhanced EMI performance
Product details
Parameters
Package | Pins | Size
Features
- Enhanced EMI Performance
- Integrated Power FETs For Up To 2-A Charge
Rate - Suitable For 1-, 2-, or 3-Cell Li-Ion and Li-Polymer
Battery Packs - Synchronous Fixed-Frequency PWM Controller
Operating at 1.1 MHz With 0% to 100% Duty
Cycle - High-Accuracy Voltage and Current Regulation
- Status Outputs For LED or Host Processor
Interface Indicates Charge-In-Progress, Charge
Completion, Fault, and AC-Adapter Present
Conditions - 20-V Absolute Maximum Voltage Rating on IN and
OUT Pins - Accurate High-Side Battery Current Sensing
- Battery Temperature Monitoring
- Automatic Sleep Mode for Low Power
Consumption - Reverse Leakage Protection Prevents Battery
Drainage - Thermal Shutdown and Protection
- Built-In Battery Detection
- Available in 20-pin 3.5-mm × 4.5-mm VQFN
Package
Description
The bqSWITCHER™ series are highly integrated Li-ion and Li-polymer switched-mode charge management devices targeted at a wide range of portable applications. The bqSWITCHER™ series offers integrated synchronous PWM controller and power FETs, high-accuracy current and voltage regulation, charge preconditioning, charge status, and charge termination, in a small, thermally enhanced QFN package.
The bqSWITCHER charges the battery in three phases: conditioning, constant current, and constant voltage. Charge is terminated based on user-selectable minimum current level. A programmable charge timer provides a safety backup for charge termination. The bqSWITCHER automatically restarts the charge cycle if the battery voltage falls below an internal threshold. The bqSWITCHER automatically enters sleep mode when VCC supply is removed.
Technical documentation
Type | Title | Date | |
---|---|---|---|
* | Datasheet | bq2412x Single-Chip Switched-Mode, Li-Ion, and Li-Polymer Charge-Management IC With Enhanced EMI Performance (bqSWITCHER™) datasheet (Rev. H) | Nov. 30, 2015 |
Technical articles | When to use rechargeable batteries in small battery applications | Oct. 01, 2019 | |
Technical articles | Should I use a linear charger or a switching charger? | Oct. 30, 2015 | |
Technical articles | Summertime and the livin' is easy | Jun. 20, 2014 | |
User guide | Using the bq24120/3 (bqSwitcher)(TM) (Rev. A) | Nov. 05, 2007 | |
Application note | Implementations of Battery Charger and Power-Path Mgmt System Using bq241xx | Jun. 06, 2006 |
Design & development
For additional terms or required resources, click any title below to view the detail page where available.Hardware development
Description
The bq24123EVM-002 provides a convenient method for evaluating the performance of a charge management solution for portable applications using the bq24123. The charger can deliver up to 2 A of continuous output current and is programmed from the factory to deliver 1.33 A of charging (...)
Features
- Input voltage: 5 V to 16 V (one cell) or 9.2 V to 16 V (two cell)
- Charge rate: 1.33 A
- Output regulation voltage: 4.2 V (factory default) or 8.4 V (two cell)
- Number of series cells: 1 or 2 series (configured with jumper)
Software development
Features
The program gives the user:
- Worse-case limits of the resistance
- Trip voltages
- Temperatures of the design
CAD/CAE symbols
Package | Pins | Download |
---|---|---|
VQFN (RHL) | 20 | View options |
Ordering & quality
- RoHS
- REACH
- Device marking
- Lead finish/Ball material
- MSL rating/Peak reflow
- MTBF/FIT estimates
- Material content
- Qualification summary
- Ongoing reliability monitoring
Support & training
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