Because "8681L" might be a proprietary marking or a batch code, verify the chip using these steps:
Recommendation: For 90% of users finding this post, you are working with a TP4056 charging module. You can download the standard TP4056 datasheet to proceed with your project.
[Disclaimer: Always verify the part number against your specific hardware before applying power. The information above is based on common industry marking patterns.]
The (often marked as 8681L) is a highly integrated, SMBus-programmable, multi-chemistry battery charge controller manufactured by O2Micro International Ltd.. It is primarily designed as a Smart Battery Charger (SBC) for portable computer systems, such as laptops, to achieve high efficiency and rapid charging. Key Technical Specifications
According to the technical details found on Jotrin Electronics and Veswin Electronics, the OZ8681L features: Efficiency: >95% using an NMOS synchronous topology.
Voltage Range: Programmable via 11-bit DAC from 1.024V to 19.200V.
Charging Current: Programmable via 6-bit DAC from 128mA to 8.064A.
Adapter Current: Programmable via 6-bit DAC from 256mA to 11.008A. Package Type: Space-saving 16-pin QFN.
Operating Temperature: Extended range from -40°C to 105°C. Functional Features 8681l ic datasheet
Dynamic Current Allocation: When the system is ON, the IC automatically allocates all remaining AC adapter current (not used by the system) to the battery charger to minimize charging time.
High Precision: Features $\pm$0.5% battery voltage accuracy and $\pm$3% accuracy for both charging and adapter current.
Protection Systems: Includes built-in safeguards for battery over-voltage, over-current, reverse connection, and thermal shutdown.
Output Signals: Provides valid adapter presence detection and outputs for monitoring adapter or battery discharge current. Applications and Variants
Common Use: Specifically found on laptop motherboards, including the Lenovo IdeaPad series. Related Models:
OZ8681LN: A variant often used interchangeably in repair contexts, also available in a QFN-16 package.
OZ8682L/LN: A similar, more advanced model featuring dedicated hardware accelerators for real-time tasks. Procurement and Availability New and original OZ8681L/LN chips are available through several retailers:
eBay: Sold in multi-packs (e.g., 5 pieces) for laptop repair at retailers like credbloom and maoglimmer for approximately $9.23 to $10.39. Because "8681L" might be a proprietary marking or
Electronics Distributors: Listed as "In-Stock" at specialized distributors like Veswin Electronics and Jotrin Electronics.
The Go to product viewer dialog for this item. (often marked as 8681L) is a highly integrated, SMBus-programmable battery charge controller manufactured by O2Micro. It is primarily used as a Smart Battery Charger (SBC) in notebook and netbook computer systems to manage the complex charging requirements of multi-chemistry batteries. Core Functionality & Architecture
The IC operates using an NMOS synchronous buck topology, which provides high efficiency (typically >95%) during power conversion. Its primary role is to dynamically manage the power distribution between the system load and the battery.
Dynamic Power Allocation: When the system is powered on, the 8681L monitors the AC adapter's capacity and allocates all remaining current not used by the system to charge the battery.
High Accuracy: It features precise monitoring with ±0.5% battery voltage accuracy and ±3% accuracy for both charging and adapter current. Key Technical Specifications Specification Package 16-pin QFN (Quad Flat No-leads) Interface SMBus (System Management Bus) Level 2 compliant Battery Voltage Range 1.024V – 19.200V (11-bit DAC) Charging Current Range 128mA – 8.064A (6-bit DAC) Adapter Current Range 256mA – 11.008A (6-bit DAC) Operating Temperature -40°C to +105°C (Extended range) Safety & Protection Mechanisms
Designed for "smart battery systems" (SBS), the 8681L includes several hardware-level protection layers to prevent damage to the laptop or battery:
Over-voltage & Over-current: Built-in limits for both battery and adapter side.
Reverse Connection Protection: Safeguards against incorrectly installed batteries. Recommendation: For 90% of users finding this post,
Thermal Protection: Embedded thermal shutdown to prevent overheating during high-current charging cycles.
Adapter Detection: Automatic detection of the AC adapter voltage and status. Typical Application Circuit
In a standard laptop motherboard, the 8681L connects to the System Management Bus to communicate with the Super I/O or EC (Embedded Controller). It uses two high-side current sensors—one to monitor the AC adapter input and another for the battery charge/discharge current. This allows it to output real-time analog signals representing the current levels to the system controller. Procurement Options If you are looking for replacement parts, the Go to product viewer dialog for this item.
is available through several specialized electronics retailers: MacFactory: Offers the IC for approximately ₹149. IC Chipset: Lists it for around ₹139.
Veswin Electronics: A source for bulk or hard-to-find components.
Are you planning to replace this IC on a specific laptop motherboard, or do you need the pin-by-pin voltage map for diagnostic testing?
OZ8681L O2MICRO Integrated Circuits (ICs) - Jotrin Electronics
The datasheet provides a typical application schematic. Do not treat it as a suggestion; treat it as a law for the first prototype.
The Critical Components:
Before diving into parameters, we must decode what "8681L" typically represents.