Datasheet ^new^ | 8681l Ic

The 8681L, often identified by the full part number (also seen as OZ8681LN), is a specialized integrated circuit designed as a multi-chemistry battery charge controller

. Primarily found in laptop power management systems—most notably within Lenovo IdeaPad and Yoga series—this chip acts as a "Smart Battery Charger" (SBC) within a wider Smart Battery System (SBS) architecture. WIT Computers Core Architecture and Functionality

The OZ8681L is engineered to manage the complex relationship between the system’s power demands and the charging requirements of the battery. Dynamic Current Allocation

: A standout feature of the 8681L is its ability to monitor real-time system power consumption. When the laptop is powered on, the IC dynamically allocates all remaining current from the AC adapter—that isn't being used by the processor and other components—directly to the battery charger. This ensures the shortest possible charging time without overloading the power adapter. SMBus Programmability

: The device communicates via the System Management Bus (SMBus), allowing for precise software control over charging parameters such as voltage and current limits. Dual-Sensing Technology 8681l ic datasheet

: It typically utilizes two high-side current sensors to maintain accurate monitoring of the energy flow into and out of the battery cells. icishka.com Technical Specifications

According to various technical listings and distributor data, the 8681L typically adheres to the following specifications: Package Type : Most commonly available in a

(Quad Flat No-lead, 16-pin) package, which is ideal for the compact, slim motherboard designs of modern laptops. Voltage Range

: While specific supply voltages vary by implementation, it is designed for multi-chemistry support, allowing it to handle different Lithium-Polymer and Lithium-Ion cell configurations. Temperature Reliability The 8681L, often identified by the full part

: The IC is built for industrial-grade thermal performance, often rated to operate reliably at temperatures reaching up to 85°C. Alibaba.com Application in Laptop Engineering In modern ultra-slim laptops like the Lenovo Yoga 2 Pro

, the OZ8681L serves as a critical safeguard. It protects against: WIT Computers Incorrect Voltages : Preventing cell damage from power surges. Short Circuits : Mitigating fire risks through instant power cutoff. Internal Overheating

: Monitoring thermal profiles to throttle charging if the battery becomes too hot. Historical Context: The 8681 "Transmitter" Variant

It is worth noting that a different variant, sometimes colloquially referred to under the "8681" umbrella, was a key RF (Radio Frequency) component in early 2000s dual-band GSM mobile devices, such as the Nokia 8800 series Soft-start – usually integrated to limit inrush

. However, in contemporary board-level repair and hardware engineering discussions, the "8681L" almost exclusively refers to the O2Micro (OZ) power management controller. Alibaba.com typical application circuit for the OZ8681L?

8681L IC Datasheet (Simulated Document)

Device Type: Touch Sensor / Capacitive Proximity Detector IC Manufacturer: (Generic / Eval to TTP223 or Similar Architecture) Package: SOT-23-6

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3. Important Design Notes

• Soft-start – usually integrated to limit inrush.
• Overvoltage protection – open‑LED protection (clamps output if LED disconnects).
• Thermal shutdown – check typical threshold (~160°C).
• Layout considerations – keep LX and diode traces short, GND plane for thermal and noise.

1) Identify which 8681L you have

• Check the silkscreen/marking on the IC: full marking often includes manufacturer prefix (OZ, Z8, OZMicro, OZMicro/ O2Micro, etc.) and suffix LN/L.
• Package: OZ8681 parts commonly in QFN-16; Z8681 microcontrollers in DIP/PLCC/PDIP/other through-hole or SOIC packages.
• Context: if found on laptop battery or power board → likely OZ8681 charge controller; if on a control/embedded board → likely Z8-family microcontroller.

Review of the "8681L" Search Result Quality

• No datasheet from TI, ADI, Maxim, Microchip, ON Semi, or ST.
• No listing on AllDatasheet, Alldatasheet.com (often spammy), or Octopart.
• Generic search results return unrelated products (LED drivers, RF modules, or counterfeit listings on Alibaba).

Key Architectural Features (from the Datasheet)

Let’s pull the critical specs from the datasheet:

• Frequency Range: 1.5 GHz to 1.7 GHz (Optimized for 1575.42 MHz GPS L1 and 1602 MHz GLONASS)
• Gain (S21): 27 dB typical (at 1.575 GHz) – This is substantial; one stage can replace two general-purpose amps.
• Noise Figure (NF): 0.8 dB typical (1.1 dB max) – This is the headline feature. In RF, every 0.1 dB of noise figure reduces your link budget.
• Input Return Loss (S11): < -15 dB
• Output Return Loss (S22): < -12 dB
• Supply Voltage (Vd): 2.7 V to 5.5 V
• Current Consumption (Id): 10 mA (This is the "L" magic – standard 8681 runs at ~30 mA).
• Package: SOT-363 (SC-70-6) – Tiny, surface-mount, 2.0mm x 2.1mm.

4. Absolute Maximum Ratings

Stresses exceeding these ratings may cause permanent damage to the device.

| Parameter | Symbol | Rating | Unit | | :--- | :--- | :--- | :--- | | Supply Voltage | VDD | -0.3 to +6.0 | V | | Input Voltage | VIN | VSS-0.3 to VDD+0.3 | V | | Output Current | IOUT | ± 10 | mA | | Operating Temperature | Topr | -40 to +85 | °C | | Storage Temperature | Tstg | -50 to +125 | °C |