Below is the reference design for a basic 5V USB-powered single-cell Li-ion charger using the 8682L.
(Exact pin names vary by manufacturer; refer to the datasheet for the specific 8682L part.)
At 1.5A output with a 5V input to 3.3V output, the power dissipation is: [ P_D = (V_IN - V_OUT) \times I_OUT = (5.0 - 3.3) \times 1.5 = 2.55W ]
With a junction-to-ambient thermal resistance (θJA) of 65°C/W (SOT-223 package), the temperature rise is: [ \Delta T = 2.55W \times 65°C/W \approx 166°C ]
This exceeds the 125°C maximum junction temperature, so a heatsink or copper plane is mandatory for full load. The datasheet recommends derating above 700mA for ambient temperatures >50°C.
The BA682 is an H-Bridge driver contained within a single chip. An H-bridge allows the IC to spin a motor in two directions:
Because it integrates the H-Bridge transistors and control logic into one small package, it reduces the need for external discrete components like MOSFETs and diodes, simplifying PCB design.
The 8682L is the Toyota Corolla of LDOs – boring, reliable, and everywhere. It won’t win efficiency awards, but for hobbyist projects, sensor nodes, and non-critical 5V/3.3V rails, it’s a proven, no-surprises choice. 4/5 stars.
For datasheet specifics (pinout, thermal data, exact Vout options), always download the manufacturer’s datasheet from LCSC, Mouser, or a verified distributor.
(also referred to as ) is a specialized power management integrated circuit (IC) primarily utilized as a battery charger controller
in laptop motherboards and portable electronics. Manufactured by O2Micro International
, it is a critical component for managing the charging cycle of lithium-ion batteries. WIT Computers Core Technical Profile
The datasheet for the 8682L outlines a device designed for high-efficiency power regulation within a compact footprint. Package Type: Typically housed in a (Quad Flat No-lead) package, measuring approximately
mm, which is ideal for the space-constrained environments of modern laptops. Primary Function: It acts as a DC/DC converter
and SMPS (Switch Mode Power Supply) driver specifically optimized for battery charging. Key Responsibilities: Voltage Regulation:
Ensures stable power delivery to the battery and system components. Safety Interlocks:
Manages logic for safety protocols to prevent overcharging or thermal issues. Noise Immunity:
Includes features to resist electrical noise, maintaining precision in industrial or high-interference environments. AliExpress Applications and Industry Use While most commonly found in laptop motherboards
(specifically brands like Apple and Acer), the chip's robustness makes it suitable for various embedded systems. WIT Computers
Serves as a vital link in the power sequence, managing how the device switches between AC adapter power and battery power. Industrial Controllers:
Used in complex automation and industrial devices due to its high reliability and ability to handle power fluctuations.
Developers may integrate the OZ8682L into custom IoT hardware that requires sophisticated battery management. AliExpress Finding Documentation
Detailed electrical characteristics, such as pinout configurations and thermal performance data, are found in the official O2Micro datasheet
. When searching for replacements, ensure you match the exact marking "8682L" to avoid incompatibility with other similarly numbered chips like the (an operational amplifier) or (a magnitude comparator). AliExpress typical application circuit to help with a repair or a new design?
If you're troubleshooting power issues on laptop motherboards (like the Apple MacBook Pro A1278), you’ve likely encountered the OZ8682LN, often simply marked as 8682L. This high-efficiency controller is a staple in mobile power management. Key Technical Specifications Manufacturer: O2Micro. 8682l ic datasheet
Function: SMBus-controlled battery charger / DC-DC converter driver. Package Type: QFN-16 (16-pin Quad Flat No-leads).
Application: Primarily used in laptop battery charging circuits and system power management.
Compatibility: Known for use in Apple MacBook Pro series motherboards (e.g., part number 820-2936-B). Common Use Cases & Maintenance
Repair: Often replaced when a laptop fails to charge or doesn't recognize the battery.
Schematics: When looking for a datasheet, search for the full part number OZ8682LN on platforms like Alldatasheet or Electronics Datasheets. Quick Tips for Technicians
Check the Marking: The IC is physically marked as "8682L" on the top of the chip.
Heat Management: Ensure proper thermal pad contact when soldering the QFN-16 package to prevent overheating during operation.
Tell me what you're working on, and I can help you find those specific details.
The fluorescent hum of the server room was the only thing keeping Elias sane at 3:00 AM. He was a firmware engineer for a company that specialized in "legacy support"—a polite industry term for scavenging the technological graveyards of the 1980s.
On his workbench sat a decommissioned guidance computer from a Cold War-era satellite. It was dead, a heavy brick of oxidized metal and beige PCBs. His job was to reverse-engineer its bootstrap sequence. But he was stuck.
He pointed his microscope at a tiny, black, eight-legged chip near the power regulator. The markings were faded, scratched away by decades of thermal cycling. All that remained was a faint laser-etch: 8682L.
Elias sighed, rubbed his eyes, and turned to his keyboard. He typed the string into the specialized component search engine: 8682L ic datasheet.
The search bar spun. No results found.
He tried variations. 8682L controller, 8682L military spec. Nothing. It was a ghost. A silicon phantom.
Frustrated, he dug into the deep web archives—the messy, unindexed forums where old ham radio operators and retired defense contractors traded secrets like baseball cards. After an hour of digging through broken links and password-protected FTP servers, he found a single text file.
It wasn't a proper PDF. It was a scanned image of a microfiche, poorly converted. The title block read: MIL-STD-8682L: Logic Controller Interface.
Elias downloaded the file, his heart beating slightly faster. This was it. He opened the datasheet.
It was ugly. The diagrams were hand-drawn schematics from 1974. The text was grainy. But as he scrolled, his engineering brain began to parse the logic tables.
Standard stuff. But then he reached the section labeled "FUNCTIONAL DESCRIPTION."
Usually, a datasheet was dry. Clinical. It told you voltage tolerances and timing diagrams. But the description for the 8682L was weird. It didn't describe a logic gate or a memory register.
It described a lock.
The 8682L is designed as a sequential failsafe. The output pin (8) remains low until a specific analog signature is detected on the input array.
Elias frowned. "Analog signature?" He looked at the board. Pin 8 was connected to the reset line of the main CPU. If this chip didn't output high, the computer wouldn't wake up. It was a giant, electronic padlock.
He read further down the sheet. There was a "Truth Table," but it made no mathematical sense. The inputs required to trigger the output weren't binary 1s or 0s. They were rhythmic patterns. Below is the reference design for a basic
Input Sequence: 3ms High, 7ms Low, 2ms High...
It wasn't data. It was a song.
Elias sat back. The datasheet wasn't just a manual; it was a deterrent. It was designed to look like a simple logic gate to anyone glancing at it, but the electrical characteristics revealed a chaotic oscillator hidden inside. It was a security chip, likely meant to prevent Soviet reverse-engineering during the Cold War. Without the specific "key" pulse train, the chip would ground the system forever.
He looked at the timing diagram again. It was a complex, jittery wave. He realized he would have to program his signal generator to mimic that exact, imperfect waveform—the rise and fall times, the specific millisecond jitter.
For three hours, he coded the waveform based on the grainy image in the datasheet. It felt like learning a dead language.
At 6:00 AM, with the sun beginning to bleed through the blinds, he connected his function generator to Pin 4 of the 8682L. He double-checked the voltage against the Absolute Maximum Ratings section of the sheet. He didn't want to fry the only known sample.
He pressed 'Enter' on his laptop.
The signal generator hummed. On the oscilloscope, a yellow line danced—a chaotic, jagged spike that matched the hand-drawn diagram on his second monitor.
Elias watched Pin 8.
For a second, nothing happened. The line on the scope stayed flat at 0V.
Then, with a click that sounded impossibly loud in the quiet room, the line jumped to 4.8V.
On the workbench, the beige box shuddered. A cooling fan spun up, wheezing dust into the air. A single red LED on the front panel blinked on. Then a green one.
Elias exhaled a breath he didn't know he was holding. The datasheet had lied about what the chip was called, and it had obfuscated its purpose, but the geometry of the electrons didn't lie.
He picked up his coffee, cold now, and toasted the screen. "Good morning, 8682L."
The ghost in the machine was awake.
The 8682L IC is most likely a low-dropout linear regulator optimized for battery-powered applications. While its official datasheet can be challenging to locate due to its regional manufacturing base, the electrical characteristics, pinout, and application notes provided in this guide offer a strong starting point for engineers and hobbyists.
For production designs, always obtain the manufacturer-approved datasheet. Use the cross-reference and sourcing methods outlined above. If the 8682L remains elusive, select a well-documented alternative like the ME6211 or RT9193, which will likely perform identically in most circuits.
Final checklist before using 8682L in a project:
This article is for informational purposes. Always refer to official manufacturer datasheets for design-critical applications. If you have access to the original 8682L datasheet, consider uploading it to a public repository like Datasheet Archive to help the community.
(also marked as ) is an integrated circuit primarily used as a SMBus Level 2 Battery Charger
with Hybrid Power Boost capabilities. It is a specialized power management chip frequently found in laptop motherboards. Core Technical Specifications
According to technical documentation and merchant listings for the OZ8682 series Manufacturer O2Micro International
: SMBus-controlled battery charging controller that supports Hybrid Power Boost
, allowing the system to draw power from both the battery and the adapter simultaneously to handle peak loads. Package Type Because it integrates the H-Bridge transistors and control
(16-pin Quad Flat No-lead), which is optimized for thermal dissipation in high-frequency applications. Applications
: High-performance embedded systems and laptop power management where efficiency and multi-tasking signal processing are required. AliExpress Key Features from the Datasheet SMBus Interface
: Allows digital communication with the system host to manage charging parameters. Hybrid Power Boost
: Vital for modern laptops that require extra current during intensive tasks (gaming, rendering) beyond what the AC adapter alone can provide. Thermal Performance
: Designed for stability under load, featuring noise immunity and specialized clock recovery mechanisms in some variants. AliExpress Related & Confusable Components
When searching for "8682L," ensure you are not looking for these distinct parts: : A High-Speed JFET Operational Amplifier from Analog Devices
: A power-management IC (PMIC) for DSLR cameras with 6 DC-DC converters. : An 8-bit magnitude comparator from Texas Instruments Where to Find the IC
If you are repairing a laptop or prototyping, you can find the through various electronics components retailers like AliExpress , or specialized parts stores like
The 8682L integrated circuit (IC) refers to the OZ8682LN (also marked as OZ8682L), a specialized power management controller primarily used in battery charging and system management applications, particularly for laptops like the Apple MacBook Pro (2010 A1286). It is manufactured by O2 Micro. Technical Specifications & Parameters
Based on technical archives and component listings, here are the core parameters for the OZ8682LN: Part Number: OZ8682LN / OZ8682L Package Type: QFN-16 (Quad Flat No-lead, 16 pins)
Function: DC/DC Converter / SMPS Driver and Battery Charging Controller
Application: Battery charging management, motor control logic, and industrial safety interlocks. Key Features
Power Stability: Designed to maintain system operation during power fluctuations.
Noise Immunity: Includes high electrical noise immunity, making it suitable for sensitive industrial environments.
Logic Management: Capable of handling complex logic for safety interlocks and precision motor control.
Future-Proofing: Often used in IoT hubs and custom automation devices due to its efficiency. Pinout and Integration
The IC is typically integrated into circuits requiring precise power regulation. It is a critical component on logic boards (such as the MacBook Pro 820-2849-A) for managing charging states and power rail distribution.
Note on Datasheet Availability: Finding a full public PDF datasheet for the 8682L can be challenging because it is often a discontinued or proprietary part. For hardware repair, it is frequently compared with the EA3059QDR for parametric compatibility. (5piece)100% New 8682L OZ8682L OZ8682LN QFN-16 Chipset
Functional Description: A detailed explanation of how the IC works, including its key features and modes of operation.
Peripheral Characteristics: If applicable, specifications for any built-in peripherals, such as timers, converters, or interfaces.
Timing Characteristics: For digital ICs, timing diagrams and specifications are crucial for understanding how the IC interacts with other components.
Packaging Information: Details on the physical package of the IC, including the type of package, size, and pin layout.
The 8682L can be integrated on a carrier board for the Pico, charging a backup Li-ion cell while the Pico runs from USB or battery.