Overview
The BQ25101YFPR from Texas Instruments is a highly integrated, standalone 1-cell linear battery charger designed for lithium-ion (Li-Ion) and lithium-polymer (Li-Pol) batteries. This charger is optimized for space-limited portable applications and features a high input voltage range with input overvoltage protection, making it suitable for use with low-cost unregulated adapters.
The charger supports a single power output and allows a system load to be placed in parallel with the battery, provided that the system load does not prevent the battery from charging fully during the 10-hour safety timer. The charging process is divided into three phases: conditioning, constant current, and constant voltage, with internal temperature monitoring to adjust the charge current if necessary.
Key Specifications
| Parameter | Min | Unit | ||
|---|---|---|---|---|
| Input Voltage | -0.3 | 30 | V | |
| Output Voltage | -0.3 | 7 | V | |
| Input Current | 300 | mA | ||
| Output Current (Continuous) | 250 | mA | ||
| Junction Temperature | -40 | 150 | °C | |
| Charge Voltage Accuracy | 1% | |||
| Charge Current Accuracy | 10% | |||
| Ultra Low Battery Output Leakage Current | 75 | nA | ||
| Input Overvoltage Protection | 6.5 | V | ||
| Thermal Regulation | 125 | °C |
Key Features
- High Accuracy Charging: 1% charge voltage accuracy and 10% charge current accuracy.
- Adjustable Termination and Precharge Thresholds: Programmable via external resistors.
- Ultra Low Battery Output Leakage Current: Maximum 75 nA.
- High Voltage Chemistry Support: Up to 4.35 V for certain models.
- Protection Features: 30-V input rating, 6.5-V input overvoltage protection, and thermal regulation up to 125°C.
- Dynamic Power Management: Input voltage dynamic power management.
- Short-Circuit Protection: OUT short-circuit protection and ISET short detection.
- Temperature Monitoring: Internal control loop monitors IC junction temperature and adjusts charge current accordingly.
Applications
The BQ25101YFPR is designed for use in space-limited portable applications such as handheld devices, smartphones, tablets, and other mobile electronics. It is particularly suitable for devices that require efficient and reliable battery charging with minimal footprint.
Additional applications include wearable devices, IoT devices, and any other battery-powered portable equipment where high accuracy and protection features are crucial.
Q & A
- What is the maximum input voltage for the BQ25101YFPR?
The maximum input voltage is 30 V, with 6.5 V input overvoltage protection.
- What is the charge current range for the BQ25101YFPR?
The charge current range is from 10 mA to 250 mA.
- How accurate is the charge voltage regulation?
The charge voltage accuracy is 1%.
- What is the ultra-low battery output leakage current?
The ultra-low battery output leakage current is a maximum of 75 nA.
- Does the BQ25101YFPR support high voltage chemistry?
Yes, it supports high voltage chemistry up to 4.35 V for certain models.
- What are the thermal regulation and shutdown temperatures?
The thermal regulation limit is 125°C, and the thermal shutdown temperature is 155°C with a hysteresis of 20°C.
- Can a system load be placed in parallel with the battery?
Yes, a system load can be placed in parallel with the battery as long as it does not prevent the battery from charging fully during the 10-hour safety timer.
- How does the charger handle temperature variations?
The charger has an internal control loop that monitors the IC junction temperature and reduces the charge current if an internal temperature threshold is exceeded.
- What protection features does the BQ25101YFPR have?
The BQ25101YFPR includes input overvoltage protection, short-circuit protection, and thermal regulation.
- How are the precharge and termination current thresholds programmed?
The precharge and termination current thresholds are programmed via external resistors on the PRE-TERM pin.
