The **ADP124ACPZ-2.8-R7** is a high-performance, low quiescent current, linear regulator (LDO) manufactured by Analog Devices. It is specifically designed for battery-powered applications where power efficiency and space are critical. --- ### 1. Technical Specifications The following table summarizes the primary electrical characteristics of the device: | Parameter | Specification | | :--- | :--- | | **Output Voltage** | 2.8 V (Fixed) | | **Input Voltage Range** | 2.3 V to 5.5 V | | **Maximum Output Current** | 500 mA | | **Quiescent Current (No Load)** | 7 µA (Typical) | | **Dropout Voltage** | 130 mV @ 500 mA | | **Package Type** | LFCSP-8 (2mm x 2mm) | | **Operating Temperature** | -40°C to +125°C | --- ### 2. Key Features and Functions * **Low Quiescent Current:** The 7 µA no-load current significantly extends battery life in portable electronics during standby modes. * **High PSRR:** It offers high Power Supply Rejection Ratio (PSRR), which is essential for filtering noise from upstream switching regulators to provide clean power to sensitive sensors or RF circuits. * **Stability:** It is stable with small 1.0 µF ceramic input and output capacitors, reducing the overall PCB footprint. * **Protection Circuitry:** * **Overcurrent Protection:** Prevents damage during short circuits. * **Thermal Overload Protection:** Shuts down the device if the junction temperature exceeds safety limits. --- ### 3. Pin Configuration (LFCSP-8) The device uses a compact Lead Frame Chip Scale Package. Below is the typical pinout logic: | Pin Number | Name | Description | | :--- | :--- | :--- | | 1 | VIN | Regulator Input Supply. | | 2 | NC | No Connect. | | 3 | VOUT | Regulated Output Voltage. | | 4 | NC | No Connect. | | 5 | EN | Enable Input (High = On, Low = Off). | | 6 | NC | No Connect. | | 7 | NC | No Connect. | | 8 | GND | Ground. | | EP | Exposed Pad | Connected to Ground; used for heat dissipation. | --- ### 4. Part Number Breakdown The nomenclature follows Analog Devices' standard coding: * **ADP124:** Base model series (LDO). * **ACPZ:** Package type (LFCSP) and Lead-free status. * **2.8:** Fixed output voltage of 2.8 Volts. * **R7:** Packaging suffix (7-inch tape and reel, typically 3,000 units). --- ### 5. Common Applications * Mobile phones and handheld wireless devices. * Digital cameras and audio equipment. * Post-regulation for DC-to-DC converters. * Battery-powered medical equipment.