Overview
The BQ24125RHLRG4 from Texas Instruments is a standalone, 1-3 cell, 2A synchronous buck battery charger designed for high-efficiency and reliable battery charging. This device supports both single-cell and multi-cell Li-ion or Li-polymer battery applications. It features an integrated fixed 1MHz frequency voltage-mode controller with a feed-forward function to regulate charge current or voltage, enhancing line transient response and simplifying the compensation network. The BQ24125RHLRG4 is known for its enhanced EMI performance, which helps minimize the number of components needed to meet FCC-B standards.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Output Voltage Regulation | 4.2 (single cell), 8.4 (two cells) | - | - | V |
| Charge Current Range | 150 | - | 2000 | mA |
| Voltage Regulation Accuracy | -0.5% | - | 0.5% | % |
| Current Regulation Accuracy | -10% | - | 10% | % |
| Internal P-channel MOSFET On-resistance | 400 | - | 500 | mΩ |
| Internal N-channel MOSFET On-resistance | 130 | - | 150 | mΩ |
| Oscillator Frequency | 1.1 | - | - | MHz |
| Package Type | - | - | - | 20-pin VQFN (3.5mm x 4.5mm) |
Key Features
- Accurate High-Side Battery Current Sensing: The device senses battery current via an external sense resistor, ensuring precise current regulation.
- Battery Temperature Monitoring: Monitors battery temperature to ensure safe charging conditions.
- Automatic Sleep Mode for Low Power Consumption: Enters sleep mode when VCC supply is removed to minimize power consumption.
- Reverse Leakage Protection: Prevents battery drainage by protecting against reverse leakage current.
- Thermal Shutdown and Protection: Protects the device from overheating by entering thermal shutdown mode.
- Built-In Battery Detection: Automatically detects the presence of a battery and adjusts charging parameters accordingly.
- Enhanced EMI Performance: Designed to minimize radiated EMI, helping to meet FCC-B standards with fewer external components.
- Programmable Charge Timer: Allows for a programmable charge timer to ensure safe and controlled charging.
Applications
The BQ24125RHLRG4 is suitable for a variety of applications, including:
- Portable Electronics: Smartphones, tablets, and other handheld devices.
- Power Tools and Equipment: Cordless power tools, electric bicycles, and other battery-powered equipment.
- Medical Devices: Portable medical devices that require reliable and efficient battery charging.
- Automotive Systems: Battery management systems in vehicles, including electric and hybrid vehicles.
Q & A
- What is the primary function of the BQ24125RHLRG4?
The BQ24125RHLRG4 is a standalone, 1-3 cell, 2A synchronous buck battery charger designed for Li-ion or Li-polymer batteries.
- What are the key features of the BQ24125RHLRG4?
Key features include accurate high-side battery current sensing, battery temperature monitoring, automatic sleep mode, reverse leakage protection, thermal shutdown and protection, and built-in battery detection.
- What is the output voltage regulation range of the BQ24125RHLRG4?
The output voltage regulation range is 4.2V for single-cell and 8.4V for two-cell applications.
- What is the charge current range of the BQ24125RHLRG4?
The charge current range is from 150mA to 2000mA.
- How does the BQ24125RHLRG4 manage EMI?
The device is designed with enhanced EMI performance to minimize radiated EMI, helping to meet FCC-B standards with fewer external components.
- What is the package type of the BQ24125RHLRG4?
The device is available in a 20-pin VQFN package with dimensions of 3.5mm x 4.5mm.
- Does the BQ24125RHLRG4 support programmable charging parameters?
Yes, it supports programmable charge timers and current regulation.
- What are some common applications for the BQ24125RHLRG4?
Common applications include portable electronics, power tools, medical devices, and automotive systems.
- How does the BQ24125RHLRG4 protect against thermal issues?
The device has thermal shutdown and protection features to prevent overheating.
- Does the BQ24125RHLRG4 have built-in battery detection?
Yes, it has built-in battery detection to automatically adjust charging parameters based on the presence of a battery.
