Overview
The BQ25720RSNR is a synchronous Narrow Voltage DC (NVDC) buck-boost battery charge controller produced by Texas Instruments. This device is designed to charge 1- to 4-cell batteries from a wide range of input sources, including USB adapters, high-voltage USB-C Power Delivery (PD) sources, and traditional adapters. The NVDC configuration ensures that the system operates based on battery voltage without dropping below the minimum system voltage, even when the battery is completely discharged or removed. The charger seamlessly transitions between buck, boost, and buck-boost operation modes without host control, and it supports USB On-the-Go (OTG) function to generate an adjustable output voltage from the battery when no external input is present.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Input Voltage Range | 3.5 - 26 | V |
| Charge Current | Up to 16.2 A / 8.1 A | A |
| Charge Current Resolution | 128 mA / 64 mA | mA |
| Input Current Limit | Up to 10 A / 6.35 A | A |
| Input Current Limit Resolution | 100 mA / 50 mA | mA |
| Package Type | 32-pin WQFN (4 mm × 4 mm) | |
| Operating Temperature Range | -20 to 125 | °C |
| Thermal Resistance (Junction-to-Ambient) | 37.2 | °C/W |
Key Features
- Pin-to-pin compatible with BQ25710.
- Buck-boost NVDC charger for USB-C Power Delivery (PD) interface platform.
- Input Current Optimizer (ICO) to maximize input power without overloading the adapter.
- Integrated Fast Role Swap (FRS) feature following USB-PD specification.
- Seamless transition between buck, buck-boost, and boost operations.
- 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).
- IMVP8/IMVP9 compliant system features for Intel platform).
- Enhanced Vmin Active Protection (VAP) mode to supplement battery from input capacitors during system peak power spike).
- Comprehensive PROCHOT profile and two-level discharge current limit to avoid battery wire-out).
- System power monitor and input and battery current monitor through dedicated pins).
- Integrated 8-bit ADC to monitor voltage, current, and power).
Applications
- Standard notebook PCs and Chromebooks.
- Tablets (multimedia) and wireless speakers).
- Ultrasound scanners and ventilators).
Q & A
- What is the input voltage range of the BQ25720RSNR?
The input voltage range is from 3.5 V to 26 V.
- What is the maximum charge current of the BQ25720RSNR?
The maximum charge current is up to 16.2 A / 8.1 A.
- Does the BQ25720RSNR support USB-C Power Delivery (PD)?
- What is the purpose of the Input Current Optimizer (ICO) in the BQ25720RSNR?
The ICO maximizes input power without overloading the adapter.
- What is the Fast Role Swap (FRS) feature in the BQ25720RSNR?
The FRS feature ensures power role swapping occurs in a timely fashion to avoid momentary power loss or glitching, complying with the USB-PD specification.
- How does the BQ25720RSNR reduce EMI noise?
The device uses TI's patented switching frequency dithering pattern to reduce EMI noise over the whole conductive EMI frequency range.
- What is the Pass Through Mode (PTM) in the BQ25720RSNR?
The PTM improves efficiency by directly passing input power through the charger to the system, achieving high efficiency operation.
- Is the BQ25720RSNR compatible with Intel platforms?
- What is the Enhanced Vmin Active Protection (VAP) mode in the BQ25720RSNR?
The VAP mode supplements the battery from input capacitors during system peak power spikes to prevent system voltage drops.
- How does the BQ25720RSNR monitor system power and currents?
The device monitors adapter current, battery current, and system power through dedicated pins and an integrated 8-bit ADC.
