The **STCC4-D-R3** is a specialized electronic component manufactured by **STMicroelectronics**. It is primarily designed as an integrated solution for **USB charging controllers**, specifically focused on managing the interface between power sources and mobile devices. ### 1. General Overview The STCC4 series is designed to handle charging emulation and power switching. It ensures that a mobile device (like a smartphone or tablet) recognizes a USB port as a high-current charging source rather than just a data port. --- ### 2. Key Technical Specifications | Parameter | Specification | |:---|:---| | **Function** | USB charging controller with integrated power switch | | **Number of Channels** | Single Channel | | **Operating Voltage** | 4.5V to 5.5V | | **Current Limit** | Programmable (up to 2.5A or 3A depending on configuration) | | **Package Type** | VFQFPN 16L (3x3 mm) | | **Mounting Type** | Surface Mount (SMD/SMT) | | **Operating Temp** | -40°C to 125°C | --- ### 3. Core Electronic Features #### A. Charging Mode Emulation The chip includes internal circuitry to emulate various charging standards, allowing the device to draw maximum current. It supports: * **USB BC 1.2:** Battery Charging specification (CDP/DCP). * **Divider Modes:** Supports Apple-specific charging profiles. * **RIM/Blackberry:** Legacy charging detection. #### B. Integrated Power Switch It features a built-in **High-Side Switch** with low ON-resistance ($R_{DS(on)}$). This reduces power dissipation and heat during high-current charging cycles. #### C. Protection Circuitry To ensure the safety of both the host and the peripheral device, the STCC4-D-R3 includes: * **Over-Current Protection (OCP):** Limits current if a short circuit occurs. * **Over-Temperature Protection (OTP):** Thermal shutdown if the chip gets too hot. * **Reverse Current Protection:** Prevents power from flowing back from the device to the source. * **ESD Protection:** Built-in protection for the D+ and D- lines. #### D. Data Passthrough The "D" in the part number usually signifies **Data Pass-through**. While charging is managed, the chip allows the USB 2.0 data signals to pass through unimpeded, allowing the device to sync data while charging. --- ### 4. Typical Applications * **Automotive:** USB charging ports in car dashboards or head units. * **Computing:** Laptops and docking stations with "Always-on" charging ports. * **Wall Adapters:** Smart chargers that need to identify the connected device. ---