Overview
The BQ24618RGER from Texas Instruments is a highly integrated, standalone, USB-friendly synchronous switch-mode Li-ion or Li-polymer battery charge controller. This device is designed to support charging of 1 to 6 Li-ion or Li-polymer battery cells and operates from either a USB port or an AC adapter, supporting charge currents up to 10 A. The BQ24618RGER features high-accuracy voltage and current regulation, charge preconditioning, termination, and adapter current regulation, along with comprehensive charge status monitoring. It charges the battery in three phases: preconditioning, constant current, and constant voltage, ensuring efficient and safe charging.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| VCC Input Voltage Operating Range | 4.7 - 28 | V |
| Charge Voltage Accuracy | ±0.5% | |
| Charge Current Accuracy | ±3% | |
| Adapter Current Accuracy | ±3% | |
| Maximum Charge Current | Up to 10 A | |
| Switching Frequency | 600 kHz | |
| Package Type | VQFN (24) | |
| Body Size | 4.00 mm × 4.00 mm | |
| Operating Temperature Range | -40 to 85 °C | |
| Quiescent Current (Off-State) | < 1.5 mA (Input), < 15 µA (Battery Discharge) |
Key Features
- High-accuracy voltage and current regulation
- Constant-frequency synchronous switching PWM controller
- Charge preconditioning, termination, and adapter current regulation
- Charge status monitoring and system power selection from adapter or battery
- Internal loop compensation and soft start
- Dynamic power management to reduce system cost
- Safety features including input overvoltage protection, battery thermistor sense, reverse-protection input FET, charge overcurrent protection, battery short protection, and thermal shutdown
- Programmable safety timer and charge enable pin
- Low quiescent current sleep mode and energy star compliance
- Status outputs for adapter present and charger operation status
Applications
- Tablet PCs
- Smart Phones
- Portable Media Players and Navigation Devices
- Notebooks and Ultra-Mobile PCs
- Personal Digital Assistants
- Handheld Terminals
- Industrial and Medical Equipment
Q & A
- What is the input voltage range of the BQ24618RGER?
The input voltage range is from 4.7 V to 28 V.
- What is the maximum charge current supported by the BQ24618RGER?
The device supports charge currents up to 10 A.
- How does the BQ24618RGER regulate charge voltage and current?
The device uses high-accuracy voltage and current regulation with a constant-frequency synchronous switching PWM controller.
- What safety features are included in the BQ24618RGER?
The device includes features such as input overvoltage protection, battery thermistor sense, reverse-protection input FET, charge overcurrent protection, battery short protection, and thermal shutdown.
- How does the BQ24618RGER manage power dynamically?
The device uses dynamic power management to reduce the charging current when the input current exceeds the set limit, thereby reducing system cost.
- What is the operating temperature range of the BQ24618RGER?
The operating temperature range is from -40 to 85 °C.
- What is the quiescent current in off-state for the BQ24618RGER?
The off-state quiescent current is less than 1.5 mA for the input and less than 15 µA for battery discharge.
- How does the BQ24618RGER charge the battery?
The device charges the battery in three phases: preconditioning, constant current, and constant voltage.
- What are the typical applications of the BQ24618RGER?
Typical applications include tablet PCs, smart phones, portable media players, notebooks, and industrial and medical equipment.
- How does the BQ24618RGER handle charge termination?
The device terminates the charge when the current reaches a minimum user-selectable level, with a programmable safety timer as a backup.
