The **ADP122ACPZ-3.0-R7** is a high-performance, low-quiescent current, low dropout (LDO) linear regulator manufactured by Analog Devices. It is specifically designed for portable and wireless applications where space and power efficiency are critical. --- ### 1. Key Technical Specifications | Parameter | Specification | | :--- | :--- | | **Input Voltage Range** | 2.3 V to 5.5 V | | **Output Voltage (Fixed)** | 3.0 V | | **Maximum Output Current** | 300 mA | | **Dropout Voltage** | 85 mV (at 300 mA load) | | **Quiescent Current (No Load)** | 45 µA | | **Shutdown Current** | < 1 µA | | **PSRR (at 10 kHz)** | 60 dB | | **Operating Temperature** | -40°C to +125°C | | **Package Type** | 6-lead LFCSP (Lead Frame Chip Scale Package) | --- ### 2. Functional Description The ADP122 operates from an input voltage between 2.3 V and 5.5 V. It provides a stable 3.0 V output while consuming very little internal power. #### Core Features: * **Low Dropout (LDO):** Because the dropout voltage is only 85 mV, the device can maintain a 3.0 V output even when the input battery voltage drops as low as ~3.085 V. * **Enable Input (EN):** Includes a logic-controlled enable pin. When pulled low, the device enters a shutdown mode, reducing current consumption to nearly zero. * **Stability:** It is optimized for use with small, low-ESR ceramic capacitors (as small as 1 µF), which saves PCB space. * **Protection Circuits:** * **Thermal Overload Protection:** Shuts down the device if the junction temperature exceeds limits. * **Short-Circuit Protection:** Limits output current to prevent damage during a fault. --- ### 3. Pin Configuration (LFCSP Package) | Pin No. | Name | Function | | :--- | :--- | :--- | | 1 | **VIN** | Regulator Input Supply. | | 2 | **NC/NC** | No internal connection. | | 3 | **EN** | Enable Input. High = On; Low = Off. | | 4 | **GND** | Ground. | | 5 | **NC** | No internal connection. | | 6 | **VOUT** | Regulated Output Voltage (3.0 V). | | **EP** | **Exposed Pad** | Should be connected to Ground for thermal dissipation. | --- ### 4. Part Number Breakdown The nomenclature reveals specific details about the component: * **ADP122:** Product Series (LDO Regulator). * **ACPZ:** Package indicator (LFCSP, RoHS compliant). * **3.0:** Fixed Output Voltage (3.0 Volts). * **R7:** Packaging format (7-inch Tape and Reel, typically 3,000 units). --- ### 5. Common Applications * Mobile phones and digital cameras. * Post-regulation for DC-to-DC converters. * Battery-powered medical equipment. * Wireless sensor nodes (IoT devices).