ANALOG DEVICES MAX77975 High Performance Fast Charger Instructions
- May 15, 2024
- Analog Devices
Table of Contents
ANALOG DEVICES MAX77975 High Performance Fast Charger
Product Information
Specifications
- Product Name: MAX77985/MAX77986
- Input Voltage: High-input 3.5/5.5A
- Fast Charger: Yes
- Smart Power Selector: Yes, trademark of Maxim Integrated Products, Inc.
- Supports: Li-ion, Li-Polymer, LiFePO4 battery chemistry
- Buck Inductor Current Limit: IHSILIM for MAX77986 is 11.1A (typ), IHSILIM for MAX77985 is 8.3A (typ)
- CHGIN Input Current Limit Setting Range: IINLIMIT for MAX77986 = 0.1A to 5.5A, IINLIMIT for MAX77985 = 0.1A to 3.5A
Product Usage Instructions
- Ensure the input voltage is within the specified range of 3.5/5.5A.
- If using Li-ion, or Li-Polymer batteries, set the Charge Termination Voltage within the recommended range.
- Utilize QBEXT/PGOOD Pin 30 as needed for External Battery FET Control Output or unplug detection.
- Take advantage of Spread Spectrum Modulation to reduce EMI by configuring SS_ENV [Bit7:6] in the register CHG_CNFG_00.
- Be mindful of the Buck Inductor Current Limit and CHGIN Input Current Limit settings based on the specific model.
General Description
The MAX77985/MAX77986 is a high-performance high-input 3.5/5.5A fast charger with a Smart Power Selector™. The MAX77985/MAX77986 is the next generation of the MAX77975/MAX77976. Hence, we encourage customers to migrate the solution from MAX77975 to MAX77985 and from MAX77976 to MAX77986.
Revision History
Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. Specifications are subject to change without notice. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarks and registered trademarks are the property of their respective owners. mart Power Selector is a trademark of Maxim
Integrated Products, Inc. One Analog Way, Wilmington, MA 01887 U.S.A. | Tel: 781.329.4700 | © 2023 Analog Devices, Inc. All rights reserved. © 2023 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners
FAQ
Q: Can I use MAX77985B/MAX77986B with LiFePO4 batteries?
A: Yes, MAX77985B/MAX77986B supports LiFePO4 battery chemistry with
specific Charge Termination Voltage settings.
Q: What is the default MINSYS for MAX77985A/MAX77986A?
A: The default MINSYS for MAX77985A/MAX77986A is in the range of 3.4V to
3.7V.
Q: What are the improvements in MAX77985/MAX77986 compared to
MAX77975/MAX77976?
A: The improvements include support for a 15V hotplug without external
protection, availability of the B2SOVRC feature, and tighter tolerance for
various inputs.