Overview
The BQ25170DSGR is an integrated battery charger designed by Texas Instruments for multi-chemistry batteries, specifically targeting space-limited portable applications. This device supports charging of 1-cell Li-Ion, Li-Polymer, and LiFePO4 batteries. It features a single power output that can charge the battery while allowing system loads to be placed in parallel, provided the system load does not prevent the battery from charging fully within the safety timer duration. The charger includes three phases for charging: precharge, fast-charge constant current, and voltage regulation to reach full capacity. It also incorporates thermal regulation to protect against overheating and ensures high accuracy in voltage and current regulation.
Key Specifications
| Parameter | Value |
|---|---|
| Battery Chemistry | Multi-Chemistry (Li-Ion, Li-Polymer, LiFePO4) |
| Number of Cells | 1 |
| Current Charging | Constant Programmable |
| Charge Current Max | 800mA |
| Battery Pack Voltage | 4.4V |
| Voltage Supply (Max) | 6.6V |
| Operating Temperature | -40°C ~ 125°C (TJ) |
| Mounting Type | Surface Mount |
| Package / Case | 8-WSON (2x2) |
Key Features
- Integrated battery charger for single-cell batteries with multi-chemistry compatibility
- Constant current charging with programmable parameters
- Integrated fault protection features including over current, over temperature, over voltage, and short circuit protection
- Supports small form factor designs
- Thermal regulation to protect against overheating
- High accuracy voltage and current regulation
- External resistor programmable operation for charge voltage and current
- NTC thermistor input to monitor battery temperature
- Open-drain output for status and fault indication
- Automatic charge termination and charge status display
Applications
The BQ25170DSGR is suitable for a wide range of portable devices that require ultra-low power consumption and efficient battery management. These include:
- Wearables
- IoT devices
- Wireless headphones
- Small sensors and other portable electronics
Q & A
- What is the BQ25170DSGR used for?
The BQ25170DSGR is an integrated battery charger for 1-cell Li-Ion, Li-Polymer, and LiFePO4 batteries, designed for space-limited portable applications.
- What are the key protection features of the BQ25170DSGR?
The device includes over current, over temperature, over voltage, and short circuit protection features.
- How is the charge current and voltage regulated in the BQ25170DSGR?
The charge current and voltage are regulated through high accuracy current and voltage regulation loops, and are programmable using external resistors.
- What is the operating temperature range of the BQ25170DSGR?
The operating temperature range is -40°C to 125°C (TJ).
- Can the BQ25170DSGR support system loads in parallel with the battery?
Yes, the system load can be placed in parallel with the battery, provided the average system load does not prevent the battery from charging fully within the safety timer duration.
- How does the BQ25170DSGR manage thermal regulation?
The device has an internal control loop that monitors the IC junction temperature and reduces the charge current if the internal temperature threshold is exceeded.
- What types of batteries does the BQ25170DSGR support?
The BQ25170DSGR supports 1-cell Li-Ion, Li-Polymer, and LiFePO4 batteries.
- How can I program the charging parameters of the BQ25170DSGR?
The charging parameters can be programmed through external resistors for both charge voltage and current.
- What is the maximum charge current of the BQ25170DSGR?
The maximum charge current is 800mA.
- What is the package type of the BQ25170DSGR?
The device is available in an 8-WSON (2x2) package.
