8681l Ic Datasheet -
: High-side and low-side gate driver connections engineered to toggle external N-channel MOSFET switches that drive the inductor power stage.
The is a highly integrated, SMBus Level 2 programmable, multi-chemistry battery charge controller primarily manufactured by O2Micro . Packaged in a compact QFN-16 surface-mount enclosure , this Power Management Integrated Circuit (PMIC) is widely used in portable computer systems—such as Lenovo IdeaPad motherboards —to manage power routing and optimize battery replenishment.
Ensure the large center ground pad is properly wetted to the PCB board to prevent thermal cutout during high-current charging cycles. If you are working on a motherboard repair, let me know: What are you fixing? What voltages do you measure on the basic power rails? Is the chip showing signs of physical burn marks ?
: Monitor inputs that watch how much power flows into the board. 8681l ic datasheet
| Feature Category | Specification | | :--- | :--- | | | SMBus Programmable, Multi-Chemistry Battery Charge Controller | | Core Technology | NMOS Synchronous Topology | | Efficiency | Exceeds 95% | | Precision | ±0.5% Battery Voltage, ±3% Charging & Adapter Current | | Voltage Control | 11-bit DAC, range: 1.024V – 19.200V | | Current Control | 6-bit DAC, range: 128mA – 8.064A | | Communication | SMBus Level 2 Interface | | Protection | Over-Voltage, Over-Current, Reverse Connection, Thermal Shutdown | | Package | Space-saving 16-pin QFN |
: Inspect the high-side current sensors and corresponding gate paths to see if the IC is properly driving the isolation switches.
Ultra Librarian, SnapEDA, or the manufacturer's website often provide symbols and footprints. Alternatively, use the standard SOT-23-5 footprint from your EDA tool (e.g., KiCad, Altium, Eagle). : High-side and low-side gate driver connections engineered
High-frequency pulse width modulation (PWM) drive signals terminating at external high-side and low-side switching MOSFETs. Common Hardware Faults and Troubleshooting
| Feature | LB8681CL Specification | | :--- | :--- | | | Motor driver for voice coil and other small motors | | Supply Voltage | 2.2V to 7.5V | | Output Current | Up to 100mA (constant current) | | Package | Ultraminiature ECSP2828-10 |
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 Ensure the large center ground pad is properly
: It is critical to match the physical pin count (8, 16, or 24 pins depending on the specific sub-variant) and board design before attempting a repair.
Measure the resistance of the two high-side current sense resistors. An out-of-tolerance or blown sense resistor disables the 8681L charger loop instantly.