Overview
The BQ25730RSNR is a synchronous NVDC buck-boost battery charge controller produced by Texas Instruments. It is designed to charge 1- to 5-cell batteries from a wide range of input sources, including USB adapters, high voltage USB-C Power Delivery (PD) sources, and traditional adapters. This controller offers a low component count and high efficiency solution, making it ideal for space-constrained battery charging applications. The Narrow VDC buck-boost architecture ensures a wide input voltage range and a narrow system voltage range, which is beneficial for faster battery supplement and lower MOSFET ratings for next-stage converters.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Input Voltage Operating Range | 3.5 to 26 | V |
| Output Current Limit | Up to 12.7A/6.35A | A |
| Switching Frequency | 400 kHz / 800 kHz | Hz |
| Cell Count | 1 to 5 cells | - |
| OTG Voltage Range | 3.0 V to 24 V | V |
| Package | 32-Pin 4.0mm × 4.0mm WQFN | - |
| Junction Temperature Range | -20 to 125 | °C |
| Charge Voltage Regulation Accuracy | ±0.5% | - |
| Charge Current Regulation Accuracy | ±3% | - |
| Input Current Regulation Accuracy | ±2.5% | - |
Key Features
- Seamless transition between buck, buck-boost, and boost operations without host control.
- TI patented switching frequency dithering pattern for EMI noise reduction.
- TI patented Pass Through Mode (PTM) for system power efficiency improvement and battery fast charging achieving 99% efficiency.
- Input and battery current monitoring through dedicated pins.
- Integrated 8-bit ADC to monitor voltage, current, and power.
- Battery MOSFET ideal diode operation in supplement mode to support the system when the adapter is fully loaded.
- Power up USB port from battery (USB OTG) with adjustable 3V to 24V output.
- I2C host control interface for flexible system configuration.
- High accuracy for regulation and monitoring.
- Safety features including thermal shutdown, input, system, battery overvoltage protection, and input, MOSFET, inductor overcurrent protection.
Applications
- Oxygen concentrators and ventilators.
- Vacuum robots.
- Tablets and multimedia devices.
- Wireless speakers.
Q & A
- What is the input voltage range of the BQ25730RSNR?
The input voltage range is from 3.5 V to 26 V.
- What is the maximum charge current supported by the BQ25730RSNR?
The maximum charge current is up to 12.7 A / 6.35 A depending on the sensing resistor used.
- What is the switching frequency of the BQ25730RSNR?
The switching frequency is 400 kHz / 800 kHz.
- How many cells can the BQ25730RSNR charge?
The BQ25730RSNR can charge 1 to 5 cells.
- What is the OTG voltage range of the BQ25730RSNR?
The OTG voltage range is from 3.0 V to 24 V.
- What package type is the BQ25730RSNR available in?
The BQ25730RSNR is available in a 32-Pin 4.0mm × 4.0mm WQFN package.
- What are the safety features of the BQ25730RSNR?
The safety features include thermal shutdown, input, system, battery overvoltage protection, and input, MOSFET, inductor overcurrent protection.
- Does the BQ25730RSNR support USB On-the-Go (OTG) function?
Yes, the BQ25730RSNR supports the USB On-the-Go (OTG) function from a 1- to 5-cell battery.
- What is the purpose of the Pass Through Mode (PTM) in the BQ25730RSNR?
The Pass Through Mode (PTM) improves system power efficiency by directly passing input power through the charger to the system, achieving up to 99% efficiency.
- How does the BQ25730RSNR reduce EMI noise?
The BQ25730RSNR uses TI patented switching frequency dithering pattern to reduce EMI noise.
