Overview
The BQ25798RQMR is a high-efficiency DC/DC buck-boost solar battery charger designed by Texas Instruments. It is optimized for reliable charging of 1-4 cell Li-ion or Li-polymer batteries. This device is particularly suited for portable electronics and power banks, featuring low power consumption, programmable input current limit, and integrated input current sensing. The BQ25798RQMR integrates switch-mode battery charging and system power-path management, enabling efficient charging while providing power to the system simultaneously.
Key Specifications
| Parameter | Description |
|---|---|
| Manufacturer Part # | BQ25798RQMR |
| Package/Case | 29-Pin VQFN (4mm x 4mm) |
| Input Voltage Range | Up to 20V |
| Output Current | Up to 5A |
| Battery Type | 1-4 cell Li-ion or Li-polymer |
| Operating Temperature | -40°C to 85°C |
| Maximum Power Consumption | 1.5W |
| Programmable Input Current Limit | Up to 6.35A |
| MPPT Algorithm | VOC scaling for maximum power from photovoltaic panels |
Key Features
- High Efficiency Charging: Achieves high efficiency charging with a maximum power consumption of 1.5W.
- Programmable Input Current Limit: Allows for adjustable input current limit up to 6.35A, ensuring safe and reliable charging.
- Integrated Input Current Sensing: Provides accurate measurement of input current for optimal charging control.
- Low Power Consumption: Designed for low power consumption, making it suitable for portable electronics and power banks.
- Maximum Power Point Tracking (MPPT): Optimizes power drawn from photovoltaic panels using VOC scaling algorithm.
- I2C Controlled and Autonomous Charging Modes: Supports both I2C host-controlled charging and autonomous charging modes.
- System Power-Path Management: Enables simultaneous charging and system operation without overloading the input source.
- Safety Features: Includes over-voltage/overcurrent protections, battery temperature monitoring, and charge timers.
Applications
The BQ25798RQMR is ideal for applications that require high-efficiency charging of Li-ion or Li-polymer batteries, such as:
- Portable electronics and power banks
- Solar-powered chargers and devices
- Electric vehicles and automotive systems
- Video doorbells, smart home controls, data concentrators, robotic lawn mowers, asset tracking, mobile POS, multiparameter patient monitors, electrocardiogram (ECG), and ultrasound smart probes.
The device is suitable for both outdoor and indoor applications, including environments such as solar-powered chargers, power banks, and automotive systems.
Q & A
- Q: What is the maximum input voltage supported by the BQ25798RQMR?
A: The BQ25798RQMR supports a maximum input voltage of 20V.
- Q: Can the BQ25798RQMR be used in automotive systems?
A: Yes, the BQ25798RQMR is suitable for use in automotive systems, offering high-efficiency charging and reliable operation in demanding environments.
- Q: What types of batteries does the BQ25798RQMR support?
A: The BQ25798RQMR supports 1-4 cell Li-ion or Li-polymer batteries.
- Q: Does the BQ25798RQMR have built-in MPPT functionality?
A: Yes, the BQ25798RQMR includes a built-in Maximum Power Point Tracking (MPPT) algorithm to optimize power from photovoltaic panels.
- Q: What is the maximum output current of the BQ25798RQMR?
A: The BQ25798RQMR has a maximum output current of up to 5A.
- Q: How does the BQ25798RQMR manage system power?
A: The BQ25798RQMR uses NVDC power path management, regulating the system to not drop below a configurable minimum system voltage and supporting battery supplement mode when system power exceeds the input source rating.
- Q: What safety features does the BQ25798RQMR include?
A: The BQ25798RQMR includes over-voltage/overcurrent protections, battery temperature monitoring, trickle charge, pre-charge and fast charge timers, and thermal regulation to reduce charge current when the junction temperature exceeds a programmable threshold.
- Q: Can the BQ25798RQMR operate in autonomous charging mode?
A: Yes, the BQ25798RQMR supports autonomous charging mode, enabling charging without software engagement after power-up.
- Q: What is the package type and size of the BQ25798RQMR?
A: The BQ25798RQMR is housed in a 29-pin VQFN package with dimensions of 4mm x 4mm.
- Q: Does the BQ25798RQMR support USB On-the-Go (OTG) function?
A: Yes, the BQ25798RQMR supports USB On-the-Go (OTG) function, discharging the battery to generate an adjustable voltage on VBUS compliant with USB PD 3.0 specification.
