Overview
The BQ25887RGER from Texas Instruments is a highly-integrated 2-A boost-mode battery charger designed for 2-cell (2s) Li-Ion and Li-polymer batteries. This device is optimized for USB input and features cell balancing, making it essential for applications with two series-connected battery cells. The BQ25887 integrates all necessary components, including MOSFETs, current sensing, and loop compensation, to provide a high-efficiency charging solution.
The charger operates at a high frequency of 1.5 MHz and supports input current limits from 500 mA to 3.3 A, making it compatible with USB 2.0 and USB 3.0 standards. It also includes an input current optimizer to maximize input power without overloading adapters.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Input Voltage Range | 3.9 to 6.2 | V |
| Maximum Input Voltage | 20 | V |
| Charge Current | Up to 2 A | A |
| Switching Frequency | 1.5 MHz | Hz |
| Charge Efficiency | 93.4% at 5-V adapter, 7.6-V battery, 1-A charge | % |
| Cell Balancing Current | Up to 400 mA | A |
| ADC Resolution | 16-bit | |
| Package Type | VQFN (24-pin) | |
| Package Size | 4.00 mm x 4.00 mm | mm |
| Junction-to-Ambient Thermal Resistance | 32.4 | °C/W |
Key Features
- High-efficiency 2-A, 1.5-MHz switch-mode boost charger
- Optimized for USB input and 2-cell Li-Ion battery
- Cell balancing feature with resistor programmable current setting up to 400 mA
- Selectable low power PFM mode for light load operation
- Input current limit (500 mA to 3.3 A with 100-mA resolution)
- Input current optimizer (ICO) to maximize input power without overloading adapters
- Integrated 16-bit ADC for system monitoring (BUS voltage and current, each cell voltage, charge current, and NTC and die temperature)
- High integration includes all MOSFETs, current sensing, and loop compensation
- High accuracy: ±0.5% charge voltage regulation, ±5% charge current regulation, and ±7.5% input current regulation
- Safety features: battery temperature sensing, thermal regulation, and thermal shutdown
Applications
- Electronic and robotic toys
- Virtual reality headsets
- IP network cameras
- Drone payload control
Q & A
- What is the primary function of the BQ25887RGER?
The BQ25887RGER is a 2-A boost-mode battery charger designed for 2-cell Li-Ion and Li-polymer batteries, optimized for USB input.
- What is the input voltage range of the BQ25887RGER?
The input voltage range is from 3.9 V to 6.2 V, with a maximum absolute input voltage rating of 20 V.
- What is the maximum charge current supported by the BQ25887RGER?
The device supports a maximum charge current of up to 2 A.
- Does the BQ25887RGER support cell balancing?
- What is the switching frequency of the BQ25887RGER?
The switching frequency is 1.5 MHz.
- How efficient is the BQ25887RGER in charging batteries?
- What type of ADC is integrated into the BQ25887RGER?
- What safety features does the BQ25887RGER include?
- What is the package type and size of the BQ25887RGER?
- What are some typical applications of the BQ25887RGER?
