: The chip operates strictly within the Smart Battery System (SBS) guidelines. It acts as a slave device that receives voltage and current regulation parameters directly from the intelligent circuitry inside the battery pack itself. Key Specifications & Absolute Maximum Ratings
Communication with the host system and the smart battery occurs via a standard System Management Bus, allowing real-time current and voltage level programming.
SMBus control for voltage, charge, and input current; available in a 16-pin QFN package. Battery Compatibility: Supports 1–4 cell Lithium-Ion (Li-Ion) chemistries. Jotrin Electronics 🎛️ DAC (Digital-to-Analog Converter) Settings 11-bit DAC, Charge Current: 6-bit DAC, Adapter Current: 6-bit DAC, Jotrin Electronics 🛡️ Protection & Functions
Searching for the "8681L IC datasheet" often leads to a surprising discovery: the code "8681L" isn't a single component, but rather a family of specialized integrated circuits. This comprehensive guide analyzes the two primary ICs associated with the "8681L" label—the motor driver and the OZ8681LN power management IC—providing detailed datasheet analysis, technical specifications, application guidance, and sourcing strategies.
: High-side differential sense pins connect across an external sense resistor to monitor the total current entering from the AC adapter.
Using a multimeter, check the core input voltage pin of the 8681L to ensure power from the DC jack is making it through the first stage isolation MOSFETs. 8681l ic datasheet
VOUT=0.8V×(1+R1R2)cap V sub cap O cap U cap T end-sub equals 0.8 cap V cross open paren 1 plus the fraction with numerator cap R sub 1 and denominator cap R sub 2 end-fraction close paren For a standard 3.3V output, choose 2. Inductor Selection ( L1cap L sub 1
The input current sensing circuit deteriorates, failing to signal the system that a charger has been attached.
Because the 8681L uses a 16-pin layout, its hardware interface is exceptionally dense. Though individual pin naming conventions remain proprietary to the O2Micro documentation, a typical SMBus buck controller datasheet divides these 16 nodes into logical subsystems:
: Verify the specific alphanumeric codes on the physical package to ensure batch traceability and avoid counterfeit parts.
Internal soft-start limits inrush current during startup. 2. Pin Configuration and Functions : The chip operates strictly within the Smart
When replacing the chip using a BGA/QFN rework station, pay close attention to the solder profiles: : Target a peak reflow gun temperature of 210∘C210 raised to the composed with power C 215∘C215 raised to the composed with power C
When a laptop fails to charge or does not detect the battery, the is a common failure point. Common Symptoms of Failure
: Prioritizes system load demands over battery charging to prevent adapter voltage sag.
A key feature outlined in the 8681L technical specifications is its use of . When a laptop is plugged in and turned on, the system load fluctuates constantly based on CPU and GPU utilization. The 8681L continuously tracks this active consumption and dynamically allocates all remaining AC adapter current to the battery charger . This design provides two concrete engineering advantages:
OZ8681L / 8681L IC Datasheet: The Comprehensive Guide to Smart Battery Charge Controllers SMBus control for voltage, charge, and input current;
The OZ8681LN provides a clear set of key electrical parameters critical for any design or repair:
L1 (4.7uH) SW [Pin 3] ------(UUUUU)-------+-------+-----> V_OUT (3.3V / 3A) | | [R1] [C_OUT] (47uF) | | FB [Pin 5] --------------------+ | | | [R2] | | | GND [Pin 4] --------------------+-------+-----> GND Component Selection Guidelines 1. Setting the Output Voltage ( VOUTcap V sub cap O cap U cap T end-sub The output voltage is programmed via a resistor divider ( R1cap R sub 1 R2cap R sub 2 VOUTcap V sub cap O cap U cap T end-sub to the FB pin. Use the following formula:
If you build the circuit and the gain is off by 3 dB, follow this checklist:
+-----------------------+ | 16 15 14 13 12 | 1 | | 11 2 | 8681L IC | 10 3 | (Top View) | 9 4 | | 8 | 5 6 7 8 9 | +-----------------------+