The **ADP3309ART-2.85-R7** is a precision, low dropout (LDO) linear voltage regulator part of the anyCAP® family from Analog Devices. It is specifically designed to provide a stable output voltage with high accuracy and minimal external component requirements. ### 1. Key Technical Specifications | Parameter | Value / Description | | :--- | :--- | | **Output Voltage** | 2.85V (Fixed) | | **Input Voltage Range** | 2.8V to 12V | | **Output Current** | 100 mA | | **Dropout Voltage** | 120 mV (Typical at 100 mA) | | **Package Type** | SOT-23-5 (ART) | | **Operating Temperature** | -40°C to +85°C | | **Accuracy** | ±0.8% at room temperature | --- ### 2. Core Features and Benefits * **anyCAP® Technology:** Unlike traditional LDOs that require specific types of capacitors (like Tantalum), this part is stable with any type of capacitor, including low-cost, multi-layer ceramic capacitors (MLCCs). * **Low Quiescent Current:** It draws very little current (approx. 70 µA) in light load conditions, making it ideal for battery-powered devices. * **Shutdown Mode:** Includes a digital shutdown pin to reduce current consumption to less than 1 µA when the device is not in use. * **Error Flag:** Features an open-collector output that signals if the output voltage drops out of regulation (e.g., during thermal overload or undervoltage). --- ### 3. Pin Configuration (SOT-23-5) | Pin No. | Name | Function | | :--- | :--- | :--- | | 1 | **OUT** | Regulated 2.85V output. | | 2 | **GND** | Ground reference. | | 3 | **ERR** | Error flag output (Active low). | | 4 | **SD** | Shutdown control (Active low to turn off). | | 5 | **IN** | Unregulated input voltage. | --- ### 4. Common Applications Because of its 2.85V output and high precision, this specific variant is often used in: 1. **SCSI Termination:** 2.85V is the standard voltage required for active termination in SCSI interfaces. 2. **Handheld Instruments:** Due to the small SOT-23 footprint and low power usage. 3. **Post-Regulation:** Cleaning up noise from switching power supplies for sensitive analog circuits. --- ### 5. Part Number Breakdown * **ADP3309**: The base model series. * **ART**: Indicates the SOT-23-5 package. * **2.85**: Fixed output voltage of 2.85 Volts. * **R7**: Refers to the Tape and Reel packaging (7-inch reel). ---