Overview
The BQ25155YFPT from Texas Instruments is a highly integrated battery charge management IC designed for wearable, portable, and small medical devices. This IC combines a linear charger, a regulated output voltage rail for system power, an ADC for battery and system monitoring, an LDO, and a push-button controller. It is optimized for quick and accurate charging of small batteries while providing a regulated voltage to the system. The device supports a wide range of programmable parameters through the I2C interface, making it a flexible and efficient charging solution.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Fast Charge Current (ICHARGE) | 1.25 mA | - | 500 mA | mA |
| Input Voltage (VIN) | -0.3 | - | 20 | V |
| Input Current Limit (IILIM) | 50 | - | 600 | mA |
| LDO Output Voltage (VLDO) | - | 1.8 | - | V |
| ADC Resolution | - | 16 | - | Bits |
| I2C Frequency | 100 | - | 400 | kHz |
| Package Type | - | - | - | 20-Pin DSBGA |
| Body Size | - | - | - | 2.00 mm x 1.60 mm |
Key Features
- Linear battery charger with 1.25-mA to 500-mA fast charge current range and 0.5% accurate I2C programmable battery charging.
- Ultra-low quiescent current (Iddq) for extended battery life: 10-nA in Ship mode and 400-nA while powering the system.
- One push-button wake-up and reset input with adjustable timers, supporting system power cycle and hardware reset.
- 16-bit ADC for monitoring charge current, battery thermistor, battery voltage, input voltage, and system voltage.
- Always-on 1.8-V VDD LDO supporting loads up to 10 mA.
- Safety-related certifications: TUV IEC 62368 Certification.
- Advanced power path management and control, allowing the device to provide power to the system while charging the battery.
- I2C programmable parameters including input current limit, charge current, LDO output voltage, and temperature thresholds.
- Voltage-based JEITA compatible battery pack thermistor monitoring input to prevent charging outside safe temperature ranges.
Applications
- Headsets, earbuds, and hearing aids.
- Smart watches and smart trackers.
- Wearable fitness and activity monitors.
- Blood glucose monitors.
Q & A
- What is the BQ25155YFPT used for?
The BQ25155YFPT is a highly integrated battery charge management IC used for wearable, portable, and small medical devices.
- What is the charge current range of the BQ25155YFPT?
The charge current range is from 1.25 mA to 500 mA.
- What is the quiescent current in Ship mode?
The quiescent current in Ship mode is 10 nA.
- Does the BQ25155YFPT have safety certifications?
Yes, it has TUV IEC 62368 Certification.
- What type of package does the BQ25155YFPT come in?
It comes in a 20-Pin DSBGA package with a body size of 2.00 mm x 1.60 mm.
- What is the resolution of the ADC in the BQ25155YFPT?
The ADC resolution is 16 bits.
- Can the BQ25155YFPT monitor battery temperature?
Yes, it can monitor battery temperature using a thermistor connected to the TS pin.
- Is the BQ25155YFPT I2C programmable?
Yes, various parameters such as input current limit, charge current, and LDO output voltage are programmable through the I2C interface.
- What are some common applications of the BQ25155YFPT?
Common applications include headsets, earbuds, smart watches, wearable fitness monitors, and blood glucose monitors.
- What is the maximum input voltage tolerance of the BQ25155YFPT?
The maximum input voltage tolerance is 20 V.
