## Overview of the ADP5073ACPZ-R7 The **ADP5073ACPZ-R7** is a high-performance, DC-to-DC switching regulator manufactured by Analog Devices. It is specifically a **high voltage, inverting regulator** designed to generate a negative output voltage from a positive input voltage. --- ### 1. Key Technical Specifications | Parameter | Specification | | :--- | :--- | | **Input Voltage Range** | 2.85 V to 15 V | | **Output Voltage Range** | 0 V down to -30 V (Adjustable) | | **Max Output Current** | Up to 1.2 A (Internal Switch) | | **Switching Frequency** | 1.2 MHz or 2.4 MHz (Pin Selectable) | | **Package** | 20-lead LFCSP (4mm x 4mm) | | **Operating Temperature** | -40°C to +125°C | --- ### 2. Core Functional Components The internal architecture of the ADP5073 consists of several critical electronic sections: 1. **Power Switch:** Includes a 1.2 A low-side N-channel MOSFET that handles the energy transfer to the inductor. 2. **Oscillator/Frequency Control:** Allows the user to select between 1.2 MHz (for higher efficiency) or 2.4 MHz (for smaller external components like inductors and capacitors). 3. **PWM Control Logic:** Uses current-mode pulse-width modulation to regulate the output voltage accurately under varying load conditions. 4. **Soft Start Circuitry:** Prevents inrush current during startup by gradually increasing the current limit. 5. **Protection Features:** Includes Overcurrent Protection (OCP), Thermal Shutdown (TSD), and Undervoltage Lockout (UVLO). --- ### 3. Application Circuit Example To utilize the ADP5073, a standard inverting buck-boost configuration is typically used. Below is a simplified representation of the required external components: ```text Input (Vin) ----> [ Inductor ] ----+---- [ Diode (Schottky) ] ----> Output (Vout-) | [ SW Pin (ADP5073) ] ``` #### Typical Component Selection: * **Inductor:** Usually 1.0 µH to 10 µH depending on the switching frequency. * **Capacitors:** Low ESR ceramic capacitors are recommended for the input and output to minimize ripple. * **Feedback Resistors:** A resistor divider is connected to the `FB` pin to set the specific negative output voltage. --- ### 4. Typical Use Cases * **Bipolar Amplifiers:** Providing the negative rail for high-speed Op-Amps. * **ADC/DAC Supplies:** Generating clean negative bias for data converters. * **RF Modules:** Powering negative bias circuits in RF power amplifiers. * **Optical Modules:** Used in telecommunications hardware for laser diode biasing. ---