Features: · Enhanced EMI Performance
· Integrated Power FETs For Up To 2-A Charge Rate
· Ideal For Highly Efficient Charger Designs For Single-Cell or Two-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 x 4,5 mm QFN Package
Application· Handheld Products
· Portable Media Players
· Industrial and Medical Equipment
· Portable Equipment
· Portable DVD PlayersPinout
Specifications
| Supply voltage range (with respect to VSS) |
IN,VCC |
20 V |
| Input voltage range (with respect to VSS and PGND) |
STAT1, STAT2, PG, CE, CELLS, SNS, BAT |
0.3 V to 20 V |
| OUT |
0.7 V to 20 V |
| TS, TTC |
7 V |
| VTSB |
3.6 V |
| ISET1, ISET2 |
3.3 V |
| Voltage difference between SNS and BAT inputs (VSNS-VBAT) |
±1 V |
| Output sink |
STAT1, STAT2, PG |
10 mA |
| Output current (average) |
OUT |
2.2 A |
| TA |
Operating free-air temperature range |
40°C to 85°C |
| TJ |
Junction temperature range |
40°C to 125°C |
| Tstg |
Storage temperature |
65°C to 150°C |
| |
Lead temperature 1,6 mm (1/16 inch) from case for 10 seconds |
300°C |
(1) Stresses beyond those listed under absolute maximum ratings may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated under recommended operating conditions is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
DescriptionThe 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 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 of bq24123 provides a safety backup for charge internal threshold. The bqSWITCHER automatically enters sleep mode when VCC supply is removed
bq24123 Data Sheet
