Overview
The BQ24295RGET from Texas Instruments is a highly-integrated, I2C-controlled battery charge management and system power path management device. It is designed for 1-cell Li-Ion and Li-polymer batteries and is particularly suited for a wide range of portable device applications, including power banks, tablets, and other mobile devices. The device features autonomous battery charging with or without host management, high accuracy in charge voltage and current regulation, and comprehensive safety features such as thermal regulation, over-voltage protection, and over-current protection.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Input Voltage Range | 3.9V - 6.2V | V |
| Input Current Limit | 100 mA, 150 mA, 500 mA, 900 mA, 1 A, 1.5 A, 2 A, 3 A | A |
| Charge Current Regulation | ±7% | % |
| Charge Voltage Regulation | ±0.5% | % |
| Output Voltage in Boost Mode | 4.55V - 5.5V (default 5.1V) | V |
| Boost Mode Current | 1.5A | A |
| Switching Frequency | 1.5 MHz | Hz |
| Package Type | 24-pin, 4x4 mm VQFN | - |
| Operating Temperature Range | -40°C to 85°C | °C |
| Junction-to-Ambient Thermal Resistance | 32.2 °C/W | °C/W |
Key Features
- Autonomous battery charging with or without host management
- High accuracy in charge voltage and current regulation (±0.5% and ±7%, respectively)
- Power path management with low impedance to optimize switch-mode operation efficiency
- Synchronous switching MOSFETs and integrated current sensing
- Battery boost operation with adjustable output voltage (4.55V - 5.5V) at 1.5A
- Compliance with USB 2.0 and USB 3.0 power specifications
- D+/D- detection for input source identification and non-standard adapter detection
- Thermal regulation and thermal shutdown for safety
- Input and system over-voltage protection, MOSFET over-current protection
- Charge status outputs for LED or host processor and fault notification through INT pin
- Low battery leakage current (20 µA) and support for shipping mode
Applications
The BQ24295RGET is ideal for a variety of portable device applications, including:
- Power banks
- Tablets
- Smartphones and other mobile devices
- Portable media players and gaming devices
- Other battery-powered consumer electronics
Q & A
- What is the input voltage range of the BQ24295RGET?
The input voltage range is 3.9V to 6.2V, including standard USB host ports and USB charging ports with 6.4V over-voltage protection.
- What are the key safety features of the BQ24295RGET?
The device includes safety features such as thermal regulation, over-voltage protection, over-current protection, battery temperature sensing, and a charging safety timer.
- How does the BQ24295RGET manage power path?
The device regulates the system slightly above battery voltage but does not drop below 3.5V minimum system voltage, ensuring system operation even when the battery is depleted or removed.
- What is the switching frequency of the BQ24295RGET?
The switching frequency is 1.5 MHz, which helps in maintaining a low profile.
- What is the package type and size of the BQ24295RGET?
The device is available in a 24-pin, 4x4 mm VQFN package.
- Does the BQ24295RGET support battery boost operation?
Yes, it supports battery boost operation by supplying an adjustable voltage of 4.55V - 5.5V (default 5.1V) at 1.5A.
- How does the BQ24295RGET detect the input source?
The device detects the input source through D+/D- detection following the USB battery charging spec 1.2 and also detects non-standard 2A/1A adapters.
- What is the operating temperature range of the BQ24295RGET?
The operating temperature range is -40°C to 85°C.
- Does the BQ24295RGET have any specific thermal management features?
Yes, it includes thermal regulation that reduces charge current when the junction temperature exceeds 120°C (programmable).
- How does the BQ24295RGET report charging status and faults?
The device reports charging status through the STAT output and immediately notifies the host of any fault through the INT pin.
