## ADP5074ACPZ-R7: High-Performance DC-to-DC Regulator The **ADP5074ACPZ-R7** is a high-performance, non-isolated DC-to-DC regulator capable of generating a negative output voltage from a positive input voltage (Inverting Topology). It is primarily used in applications requiring bipolar power supplies for precision analog components. --- ### 1. Key Technical Specifications | Parameter | Specification | | :--- | :--- | | **Topology** | Inverting (Buck-Boost based) | | **Input Voltage Range** | 2.85 V to 15 V | | **Output Voltage Range** | -0.6 V to -30 V | | **Maximum Output Current** | 1.2 A (Integrated Power Switch) | | **Switching Frequency** | Adjustable (1.0 MHz to 2.4 MHz) | | **Package** | 20-lead LFCSP (4mm x 4mm) | | **Operating Temperature** | -40°C to +125°C | --- ### 2. Core Functional Components The internal architecture of the ADP5074 consists of several critical electronic blocks: * **Integrated Power Switch:** Features a low $R_{DS(on)}$ N-channel MOSFET, which improves efficiency and reduces the need for external power transistors. * **PWM Control Logic:** Uses current-mode pulse-width modulation (PWM) for excellent line and load transient response. * **SYNC Input:** Allows the internal oscillator to be synchronized to an external clock, which is vital for minimizing electromagnetic interference (EMI) in sensitive systems. * **Soft Start Circuitry:** Programmable soft-start reduces inrush current during power-up to protect the input source. * **Protection Features:** * **Overcurrent Protection (OCP):** Limits peak current to prevent damage. * **Thermal Shutdown (TSD):** Shuts down the device if junction temperature exceeds safe limits. * **Undervoltage Lockout (UVLO):** Ensures the chip only operates when the input voltage is stable. --- ### 3. Application Use Cases The ADP5074 is frequently paired with its complementary part (ADP5073) to create a dual-rail supply. Common applications include: 1. **ADC/DAC Powering:** Provides the negative rail for high-speed data converters. 2. **Operational Amplifiers:** Supplies bipolar rails (e.g., ±15V or ±5V) for precision signal conditioning. 3. **RF Amplifiers:** Negative bias generation for GaAs or GaN power amplifiers. 4. **Optical Modules:** Powering biasing circuits in high-speed networking equipment. --- ### 4. Implementation Example (Simplified) ```markdown V_IN (5V) ---> [ L1 ] ---+--- [ ADP5074 ] ---+---> V_OUT (-12V) | | | [C_IN] [GND] [C_OUT] ``` * **Inductor (L1):** Stores energy during the "on" cycle and releases it to the output during the "off" cycle. * **Schottky Diode:** Essential for the commutation path in the inverting topology. * **Feedback Resistors:** A voltage divider connected to the FB pin sets the exact negative output voltage. ---