The **LD39080PT-R** is a high-performance low-dropout (LDO) linear regulator manufactured by STMicroelectronics. It is designed to provide a stable output voltage with high efficiency, specifically for high-current applications. --- ### ## Technical Specifications The following table summarizes the key electrical characteristics of the LD39080PT-R: | Feature | Specification | | :--- | :--- | | **Output Current** | 800 mA | | **Input Voltage Range** | 2.5V to 6V | | **Dropout Voltage** | Typ. 150 mV @ 800 mA | | **Output Type** | Adjustable or Fixed (1.8V, 2.5V, 3.3V, 5.0V variants) | | **Package** | PPAK / DPAK | | **Operating Temperature** | -40°C to 125°C | | **Quiescent Current** | 2.5 mA (Full Load) | --- ### ## Key Electronic Components & Features 1. **Low Dropout Architecture**: The device uses a P-channel MOSFET pass transistor. Unlike NPN-based regulators, it doesn't require high base-drive current, allowing for a very low dropout voltage (the minimum difference between input and output voltage required for regulation). 2. **Enable (EN) Pin**: This pin allows for digital control of the regulator. Driving this pin low puts the device into shutdown mode, reducing current consumption to nearly zero (approx. 1 µA). 3. **Internal Protections**: * **Current Limiting**: Protects the device during short-circuit conditions. * **Thermal Overload Protection**: Automatically shuts down the regulator if the junction temperature exceeds safe limits (typically around 150°C). 4. **Stability Components**: The LD39080 is designed to be stable with low-ESR ceramic capacitors. This reduces the physical footprint on the PCB compared to older regulators requiring large electrolytic capacitors. --- ### ## Pin Configuration (PPAK Package) Typical pinout for the LD39080PT-R series: ```text Pin 1: EN (Enable) Pin 2: VIN (Input Supply) Pin 3: GND (Ground/Tab) Pin 4: VOUT (Regulated Output) Pin 5: ADJ/NC (Adjustable pin or No Connection for fixed versions) ``` --- ### ## Typical Application Circuit To ensure stability and performance, external capacitors are required: * **Input Capacitor ($C_{IN}$)**: 1 µF is recommended to reduce input noise. * **Output Capacitor ($C_{OUT}$)**: A minimum of 2.2 µF (Ceramic) is required for stability. ---