The **BA03CC0T** is a secondary LDO (Low Dropout) voltage regulator manufactured by **ROHM Semiconductor**. It is specifically designed to provide a stable 3V output from a higher input voltage with minimal power loss. ### 1. Key Specifications The following table outlines the primary electrical characteristics of the BA03CC0T: | Parameter | Specification | | :--- | :--- | | **Output Voltage** | 3.0V (Fixed) | | **Input Voltage Range** | 4.0V to 25.0V | | **Output Current** | 1.0A (Maximum) | | **Dropout Voltage** | 0.5V (at Io = 500mA) | | **Operating Temperature** | -40°C to +125°C | | **Package Type** | TO-220FP (3-pin) | --- ### 2. Main Features The BA03CC0T is built with several integrated protection circuits to ensure stability and safety in electronic designs: * **Low Dropout Voltage:** Since it is an LDO, it can maintain a 3V output even when the input voltage is only slightly higher (approx. 3.5V), which improves efficiency. * **Built-in Overcurrent Protection (OCP):** Prevents the device from being destroyed due to an output short circuit or excessive load. * **Thermal Shutdown (TSD):** Automatically shuts down the IC if the internal junction temperature exceeds safe limits. * **High Input Voltage Tolerance:** It can handle up to 25V (with a peak surge rating of 30V), making it suitable for automotive and industrial power rails. --- ### 3. Pin Configuration The device uses a standard 3-pin layout common to the TO-220FP package: | Pin Number | Symbol | Function | | :--- | :--- | :--- | | 1 | **Vcc** | Input Voltage Supply | | 2 | **GND** | Ground (connected to the cooling fin in some models) | | 3 | **OUT** | Regulated 3.0V Output | --- ### 4. Application Circuit Example To ensure stable operation, capacitors must be connected to the input and output pins. ```markdown [Input (4V-25V)] ----[ C1: 0.33uF ]---- (Pin 1: Vcc) | [ BA03CC0T ] | [Output (3.0V)] ----[ C2: 22uF ]---- (Pin 3: OUT) | [Ground] ---------------------- (Pin 2: GND) ``` **Note:** The output capacitor ($C_2$) is critical for preventing oscillation. ROHM recommends using tantalum or aluminum electrolytic capacitors with specific ESR ranges for stability. --- ### 5. Common Use Cases * **Microcontroller Power Supplies:** Providing steady 3V power to low-voltage CPUs and MCUs. * **Automotive Electronics:** Regulating battery voltage down to logic levels. * **Industrial Equipment:** Used in control boards where 3V logic is required.