Standalone synchronous switch-mode Li-ion charger w/2A FET in QFN-20, 1 to 3 cells
Product details
Parameters
Package | Pins | Size
Features
- Ideal For Highly Efficient Charger Designs For
Single-, Two-, or Three-Cell Li-Ion and Li-Polymer
Battery Packs - bq24105 Also for LiFePO4 Battery (see Using
bq24105 to Charge the LiFePO4 Battery) - Integrated Synchronous Fixed-Frequency PWM
Controller Operating at 1.1 MHz With 0% to 100%
Duty Cycle - Integrated Power FETs for Up To 2-A Charge
Rate - High-Accuracy Voltage and Current Regulation
- Available in Both Stand-Alone (Built-In Charge
Management and Control) and System-Controlled
(Under System Command) Versions - Status Outputs for LED or Host Processor
Interface Indicates Charge-In-Progress, Charge
Completion, Fault, and AC-Adapter Present
Conditions - 20-V Maximum Voltage Rating on IN and OUT
Pins - High-Side Battery Current Sensing
- Battery Temperature Monitoring
- Automatic Sleep Mode for Low Power
Consumption - System-Controlled Version Can Be Used in NiMH
and NiCd Applications - Reverse Leakage Protection Prevents Battery
Drainage - Thermal Shutdown and Protection
- Built-In Battery Detection
- Available in 20-Pin, 3.50 mm × 4.50 mm VQFN
Package - APPLICATIONS
- Handheld Products
- Portable Media Players
- Industrial and Medical Equipment
- Portable Equipment
All other trademarks are the property of their respective owners
Description
The bqSWITCHER™ series are highly integrated Li-ion and Li-polymer switch-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 VQFN package. The system-controlled version provides additional inputs for full charge management under system control.
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 | bq241xx Synchronous Switched-Mode, Li-Ion and Li-Polymer Charge-Management IC With Integrated Power FETs (bqSWITCHER™) datasheet (Rev. P) | Nov. 30, 2015 |
Application note | BQ241xx/BQ246xx Selection of Multi-Cell Standalone Switching Battery Chargers | Dec. 31, 2019 | |
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 bq241xx bqSWITCHER(tm) (Rev. A) | Nov. 29, 2007 | |
Application note | Implementations of Battery Charger and Power-Path Mgmt System Using bq241xx | Jun. 06, 2006 | |
Application note | Power Dissipation Analysis & Circuit Design for Sync Switching Battery Charger | May 31, 2005 |
Design & development
For additional terms or required resources, click any title below to view the detail page where available.Hardware development
Description
The Texas Instruments bq24105EVM is the evaluation module (EVM) for the bq24105 Li-Ion charge management IC. The bq24105 is a highly integrated battery charge IC utilizing synchronous switch mode power conversion for efficient and comprehensive charge control of a one, two, or three series cell (...)
Features
- Input voltage: 5V to 16V (factory default) or output voltage + 0.8V to 16V (based on adjustable output voltage)
- Charge rate: 1.33A
- Output regulation voltage: 4.2V (factory default), can be adjusted
- Number of series cells: 1 (factory default), can be adjusted
Software development
Features
The program gives the user:
- Worse-case limits of the resistance
- Trip voltages
- Temperatures of the design
Design tools & simulation
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
Recommended products may have parameters, evaluation modules or reference designs related to this TI product.
Support & training
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