The **UB209AL-P08-R** is an integrated circuit (IC) primarily designed for battery management and protection, commonly used in lithium-ion/polymer battery packs. It is manufactured by UTC (Unisonic Technologies Co., Ltd). --- ### 1. Technical Specifications The following table highlights the core technical parameters of the device: | Feature | Specification | | :--- | :--- | | **Function** | Lithium-ion Battery Protection IC | | **Package Type** | TSSOP-8 (P08) | | **Number of Cells** | 1-Cell (Single Cell) | | **Overcharge Detection** | ~4.25V to 4.35V (varies by sub-series) | | **Over-discharge Detection** | ~2.4V to 3.0V | | **Operating Temperature** | -40°C to +85°C | | **RoHS Status** | Halogen-free and Lead-free (R) | --- ### 2. Key Features and Functions The UB209AL-P08-R serves as a "safety guard" for batteries by monitoring voltage and current. Its primary functions include: * **Overcharge Protection:** Prevents the battery from exceeding its safe voltage limit during charging to avoid fire or swelling. * **Over-discharge Protection:** Cuts off power when the battery voltage drops too low, preventing permanent chemical damage to the cell. * **Over-current Protection:** Monitors discharge current to protect against short circuits or excessive loads. * **High-Accuracy Voltage Detection:** Ensures precise monitoring within a very narrow tolerance margin (typically ±25mV). * **Low Current Consumption:** Designed to draw minimal power from the battery itself to prevent draining the cell during storage. --- ### 3. Pin Configuration (TSSOP-8) In the P08 (TSSOP-8) package, the typical pinout logic (standard for this series) is as follows: 1. **OD:** Over-discharge detection output (Controls Discharge MOSFET). 2. **CS:** Current sense pin. 3. **OC:** Overcharge detection output (Controls Charge MOSFET). 4. **TD:** Test pin (usually for delay time shortening during manufacturing). 5. **VCC:** Power supply input. 6. **VSS:** Ground/Negative terminal. 7. **NC:** No Connection. 8. **NC:** No Connection. --- ### 4. Typical Application Circuit This IC is typically placed on a small PCB (Protection Circuit Module) inside a battery pack. ```mermaid [Battery +] ----+---- [VCC Pin] | [Load +] | [Battery -] ----+---- [VSS Pin] | [Dual MOSFET] <--- Managed by OC/OD Pins | [Load -] ``` ---