The **ADP2164ACPZ-2.5-R7** is a high-efficiency, monolithic, synchronous step-down DC-to-DC regulator produced by Analog Devices. It is designed to convert higher input voltages into a stable, fixed 2.5V output for high-current applications. --- ### 1. Key Technical Specifications The following table outlines the primary electrical characteristics of the component: | Parameter | Specification | | :--- | :--- | | **Input Voltage Range** | 2.7V to 6.5V | | **Output Voltage (Fixed)** | 2.5V | | **Continuous Output Current** | 4 Amperes (4A) | | **Switching Frequency** | 500 kHz to 1.4 MHz (Sync-able) | | **Efficiency** | Up to 96% | | **Package Type** | 16-Lead LFCSP (4mm x 4mm) | | **Operating Temperature** | -40°C to +125°C | --- ### 2. Core Functional Components The device integrates several critical electronic parts into a single silicon chip to minimize external component count: * **Integrated MOSFETs:** It features high-side and low-side power switches with low on-resistance ($R_{DSON}$), eliminating the need for an external Schottky diode and improving efficiency. * **Internal Compensation:** Unlike many regulators that require external RC networks to stabilize the control loop, this part uses internal compensation to simplify PCB design. * **Precision Enable (EN):** A dedicated pin to turn the regulator on or off, allowing for power sequencing in complex systems. * **Power Good (PGOOD):** An open-drain output that signals when the output voltage is within its regulated range. --- ### 3. Protection Features The ADP2164 includes robust circuitry to protect the device and the load from electrical damage: 1. **Overcurrent Protection (OCP):** Monitors the current through the MOSFETs and limits it to prevent overheating or inductor saturation. 2. **Thermal Shutdown (TSD):** Automatically turns off the regulator if the internal junction temperature exceeds safety limits. 3. **Undervoltage Lockout (UVLO):** Ensures the device does not attempt to operate if the input voltage is too low to provide a stable output. 4. **Short-Circuit Protection:** Features a "hiccup mode" or frequency foldback to reduce power dissipation during a hard short. --- ### 4. Typical Application Circuitry While most logic is internal, the following external passive components are required: ```yaml External_Components: Inductor (L): Typically 0.47µH to 1.5µH (Rated for >4A) Input Capacitor (Cin): Ceramic, low ESR (e.g., 22µF) Output Capacitor (Cout): Ceramic, low ESR (e.g., 47µF x 2) ``` ---