The **ADP3309ARTZ-3.3-R71** is a high-precision, low dropout (LDO) linear voltage regulator. It belongs to the anyCAP® family from Analog Devices, which is specifically designed to be stable even with extremely small surface-mount multilayer ceramic capacitors (MLCCs). --- ### ## Technical Specifications The following table outlines the primary electrical characteristics of the ADP3309: | Parameter | Specification | | :--- | :--- | | **Output Voltage (Fixed)** | 3.3 V | | **Input Voltage Range** | 2.8 V to 12 V | | **Output Current** | 100 mA | | **Dropout Voltage** | 120 mV @ 100 mA | | **Quiescent Current** | 70 µA (Typical) | | **Accuracy Over Line/Load** | ±1.2% | | **Package** | SOT-23-5 (RT-5) | | **Operating Temperature** | -40°C to +85°C | --- ### ## Key Electronic Features 1. **anyCAP® Technology**: Unlike traditional LDOs that require large tantalum capacitors with specific Equivalent Series Resistance (ESR), this part is stable with any type of capacitor, including low-ESR ceramic capacitors (0.47 µF or larger). 2. **Low Dropout Voltage**: With only 120 mV required between input and output at full load, it is highly efficient for battery-powered applications. 3. **Shutdown Mode**: It features a logic-controlled shutdown pin (SD) that reduces current consumption to less than 1 µA, extending battery life. 4. **Protection Circuitry**: - **Current Limiting**: Protects the device during short-circuit conditions. - **Thermal Overload Protection**: Shuts down the regulator if the junction temperature exceeds safe limits. --- ### ## Pin Configuration (SOT-23-5) | Pin No. | Name | Function | | :--- | :--- | :--- | | 1 | **IN** | Unregulated Input Voltage. | | 2 | **GND** | Ground Reference. | | 3 | **SD** | Shutdown Input (Active Low). | | 4 | **ERR** | Error Flag (Open-collector output, signals out-of-regulation). | | 5 | **OUT** | Regulated Output Voltage. | --- ### ## Typical Application Circuit The circuit is straightforward, requiring minimal external components: ```text Vin ----[ IN ]-------[ OUT ]---- Vout (3.3V) | | [Cin] [Cout] | | GND ----[GND]--------[GND]---- GND ``` * **Cin**: 0.47 µF ceramic capacitor. * **Cout**: 0.47 µF ceramic capacitor. * **SD**: Connect to **IN** for normal operation; pull to **GND** for shutdown.