## Overview of the LD29080PT15-R The **LD29080PT15-R** is a high-current, high-precision, low-dropout (LDO) voltage regulator manufactured by STMicroelectronics. It is designed to provide a stable, fixed output voltage while maintaining functionality even when the input voltage is only slightly higher than the output voltage. --- ### Technical Specifications | Parameter | Specification | | :--- | :--- | | **Output Voltage (Fixed)** | 1.5V | | **Input Voltage Range** | Up to 13V | | **Output Current** | 800 mA | | **Dropout Voltage** | Typically 400 mV at 800 mA | | **Package Type** | PPAK (TO-252 variant) | | **Operating Temperature** | -40°C to 125°C | | **Quiescent Current** | Low (Typically 5 mA at full load) | --- ### Key Electronic Features 1. **Low Dropout (LDO) Performance:** The device can regulate 1.5V output even when the input voltage is as low as ~1.9V. This maximizes efficiency and reduces heat dissipation in battery-powered or low-voltage systems. 2. **Internal Protection Circuitry:** * **Current Limiting:** Protects the device during short-circuit or overload conditions. * **Thermal Shutdown:** Automatically turns off the regulator if the junction temperature exceeds safe limits (preventing permanent damage). 3. **Output Stability:** The regulator is stable with low-ESR ceramic capacitors, though it typically requires at least a **10µF** output capacitor for stable operation and transient response. 4. **Inhibit Function (Enable Pin):** This specific series often includes a logic-controlled shutdown mode, allowing the system to turn the regulator on or off to save power (entering a low-current standby mode). --- ### Pin Configuration (PPAK) | Pin Number | Name | Function | | :--- | :--- | :--- | | 1 | **IN** | Unregulated input voltage. | | 2 | **GND** | Ground (connected to the thermal tab). | | 3 | **OUT** | Regulated 1.5V output voltage. | | 4 | **INH (Optional)** | Inhibit/Enable pin (High = ON, Low = OFF). | --- ### Typical Application Diagram Below is a representation of how the LD29080PT15-R is integrated into a circuit: ```text Input (e.g. 3.3V) ----+-----------+ | [ IN ] [C_in] [ LDO ]---[ OUT ]----+---- Output (1.5V) | [ GND] | GND ------------------+-----------+---------------[C_out] | GND ``` * **C_in:** Typically 1µF or higher to filter input noise. * **C_out:** Typically 10µF or higher (Tantalum or Electrolytic) to ensure stability.