The **LD1084D2T-R** is a high-current, low-dropout (LDO) positive voltage regulator. It is designed to provide high efficiency and reliable power management for electronic circuits requiring up to 5A of output current. --- ### 1. Key Technical Specifications Below are the primary electrical characteristics of the LD1084D2T-R: | Parameter | Specification | | :--- | :--- | | **Manufacturer** | STMicroelectronics | | **Output Type** | Adjustable | | **Output Voltage Range** | 1.25V to 28V | | **Maximum Output Current** | 5.0 A | | **Dropout Voltage (Typ)** | 1.3V @ 5A | | **Input Voltage (Max)** | 30V | | **Package / Case** | D2PAK (TO-263) | | **Operating Temperature** | -40°C to 125°C | --- ### 2. Core Features * **Low Dropout Voltage:** Unlike standard linear regulators (like the LM317), the LD1084 series can maintain regulation with a much smaller difference between input and output voltage. * **High Current Capability:** It is specifically engineered for high-demand applications, providing up to 5A. * **Internal Protections:** Includes internal current limiting and thermal shutdown to prevent damage during overloads or overheating. * **Pin Compatibility:** It is pin-to-pin compatible with standard three-terminal adjustable regulators, making it easy to upgrade existing designs. --- ### 3. Basic Application Circuit To set the output voltage ($V_{out}$), a resistive divider is used. The reference voltage ($V_{ref}$) is typically 1.25V. ```cpp // Formula for Output Voltage: Vout = Vref * (1 + R2/R1) + (Iadj * R2) ``` **Standard Configuration:** 1. **Input Capacitor ($C_{in}$):** A 10µF tantalum or electrolytic capacitor is recommended if the regulator is far from the power supply filter. 2. **Output Capacitor ($C_{out}$):** A minimum of 10µF is required for stability (ESR should be monitored). 3. **Resistors ($R_1, R_2$):** $R_1$ is usually placed between the Output and Adjust pins (typically 120Ω). --- ### 4. Common Applications * **High-Efficiency Linear Regulators:** For post-regulation of switching supplies. * **Battery Chargers:** Constant voltage charging for various battery chemistries. * **Microprocessor Power Supplies:** Providing stable, high-current rails for logic circuits. * **Desktop PC Peripherals:** Powering high-draw components on motherboards. ---