Overview
The BQ24123RHLRG4 from Texas Instruments is a highly integrated, standalone 1-cell to 3-cell Li-ion and Li-polymer switched-mode battery charger. This device is part of the bqSWITCHER series and is designed for a wide range of portable applications. It features a synchronous fixed-frequency PWM controller operating at 1.1 MHz with a 0% to 100% duty cycle, ensuring high-efficiency charging. The charger operates in three phases: conditioning, constant current, and constant voltage, with charge termination based on a user-selectable minimum current level or a programmable charge timer.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Package Type | 20-pin VQFN (RHL) | - |
| Operating Temperature Range | -40 to 85 | °C |
| Charge Current | Up to 2 A | A |
| Cells Supported | 1 to 3 cells | - |
| Battery Chemistry | Lithium-Ion/Polymer | - |
| Switching Frequency | 1.1 MHz | Hz |
| Voltage Regulation Accuracy | -0.5% to 0.5% | % |
| Current Regulation Accuracy | -10% to 10% | % |
| Absolute Maximum Voltage Rating on IN and OUT Pins | 20 V | V |
Key Features
- Enhanced EMI performance
- Integrated power FETs for up to 2-A charge rate
- 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 indicating charge-in-progress, charge completion, fault, and AC-adapter present conditions
- Battery temperature monitoring
- Automatic sleep mode for low power consumption
- Reverse leakage protection to prevent battery drainage
- Thermal shutdown and protection
- Built-in battery detection
Applications
The BQ24123RHLRG4 is suitable for a wide range of portable applications, including but not limited to:
- Smartphones and mobile devices
- Tablets and e-readers
- Portable media players and gaming devices
- Wearable electronics such as smartwatches and fitness trackers
- Other battery-powered consumer electronics
Q & A
- What is the maximum charge current supported by the BQ24123RHLRG4?
Up to 2 A.
- What types of battery chemistry does the BQ24123RHLRG4 support?
Lithium-Ion and Li-Polymer.
- What is the operating temperature range of the BQ24123RHLRG4?
-40 to 85 °C.
- What is the package type of the BQ24123RHLRG4?
20-pin VQFN (RHL).
- Does the BQ24123RHLRG4 have built-in thermal protection?
- How does the BQ24123RHLRG4 regulate charging?
The charger operates in three phases: conditioning, constant current, and constant voltage, with charge termination based on a user-selectable minimum current level or a programmable charge timer.
- Does the BQ24123RHLRG4 support status outputs for charge status indication?
- What is the switching frequency of the BQ24123RHLRG4?
1.1 MHz.
- Does the BQ24123RHLRG4 have reverse leakage protection?
- How does the BQ24123RHLRG4 manage power consumption when not in use?
The device automatically enters sleep mode when the VCC supply is removed for low power consumption.
