8681l Ic Datasheet Guide
Date: March 23, 2026.
The 8681L IC, often listed under the full part number OZ8681L, is a highly integrated, SMBus-programmable multi-chemistry battery charge controller. Primarily utilized as a Smart Battery Charger (SBC) within a Smart Battery System (SBS), this component is a critical part of the power management architecture for high-end portable computing devices, including various IBM and Lenovo IdeaPad laptops. 8681L IC Technical Specifications
According to technical documentation and product listings on platforms like IndiaMART and ALLDATASHEET, the 8681L offers several advanced power management capabilities:
Integrated Controller: It acts as a dedicated controller for multi-chemistry batteries (Lithium-ion, Lithium Polymer).
SMBus Interface: Level 2 SMBus programmability allows for precise communication between the battery, the IC, and the host system.
Package Type: Typically comes in a QFN-16 (Quad Flat No-lead) surface-mount package, though some variants may refer to a 40-pin configuration depending on the specific board integration. 8681l ic datasheet
Voltage and Protection: Includes safeguards against incorrect voltage, short circuits, and internal overheating to protect both the battery cells and the motherboard. Core Functional Features
The 8681L IC is designed for efficiency and safety in portable electronics:
Dynamic Current Allocation: When the system is powered on, the IC dynamically allocates all remaining AC adapter current—not currently in use by the system—to the charger. This ensures the shortest possible charging time.
Dual Current Sensors: It utilizes two high-side current sensors to monitor power flow and optimize performance.
Low Power Consumption: Designed for minimal idle draw to preserve battery life in portable devices. Applications and Hardware Integration Date: March 23, 2026
While the "8681L" designation can occasionally refer to different legacy GSM components in older mobile phones (like the Nokia 8800 series), the modern OZ8681L is synonymous with laptop motherboard power stages.
Laptop Motherboards: Found specifically in Lenovo IdeaPad models such as the U460 and U460s.
Smart Battery Systems: It is essential for managing the charging cycle of original high-capacity cells, ensuring long life cycles (often 500+ times). Replacing the 8681L IC
For technicians looking for replacement parts on MacFactory or AliExpress, it is vital to ensure the part number matches exactly (OZ8681LN or OZ8681L).
Installation Tip: Due to its surface-mount design and critical role in power delivery, replacement should be performed by qualified personnel using specialized soldering tools. The datasheet reveals a careful engineering trade-off
Risk Warning: Incorrect installation can lead to permanent damage to the laptop motherboard. 54.195.18.223 8681l Ic Datasheet [exclusive]
The datasheet reveals a careful engineering trade-off. With a 10 mA bias current, the 8681L achieves an Output 1-dB Compression Point (P1dB) of approximately -5 dBm.
Why does this matter? In a city environment, a GPS antenna receives signals at -130 dBm (whisper quiet) but also receives cellular tower bleed-over at -20 dBm (screaming loud). The 8681L must amplify the whisper without the scream causing gain compression.
The datasheet confirms the IIP3 (Input Third-Order Intercept Point) is around -3 dBm. For a low-current LNA, this is respectable. It ensures that intermodulation products don't swamp the satellite signals.
When you review the 8681L datasheet, compare it with these common alternatives to see if it is the right fit.
| IC Part | Output Voltage | Max Current | Dropout | Quiescent Current | Package | Best For | |---------|----------------|-------------|---------|-------------------|---------|----------| | 8681L | 3.3V | 300 mA | 120 mV | 25 µA | SOT-23-5 | Battery, low noise | | LM1117-3.3 | 3.3V | 800 mA | 1.1V | 5 mA | SOT-223 | High current, legacy | | MCP1703-3.3 | 3.3V | 250 mA | 625 mV | 2 µA | SOT-23 | Ultra-low IQ | | XC6206P332 | 3.3V | 200 mA | 250 mV | 1 µA | SOT-23 | Cost-sensitive, low power | | RT9013-33 | 3.3V | 500 mA | 250 mV | 25 µA | SC-70 | Fast transient response |
Takeaway: The 8681L occupies a middle ground – better dropout than XC6206, lower IQ than LM1117, but not the absolute best in any single category.