The **ADP5071AREZ-R7** is a high-performance, dual-channel DC-to-DC regulator that combines a boost regulator and an inverting regulator. It is primarily used to generate both positive and negative supply rails from a single input voltage. --- ### 1. Key Technical Specifications Below are the primary electrical characteristics of the ADP5071: | Feature | Specification | | :--- | :--- | | **Input Voltage Range** | 2.85 V to 15 V | | **Output 1 (Boost)** | Up to +39 V | | **Output 2 (Inverting)** | Down to -39 V | | **Switching Frequency** | Adjustable (1.2 MHz to 2.4 MHz) | | **Max Current (Boost)** | 2.0 A (Internal Switch) | | **Max Current (Inverting)** | 1.2 A (Internal Switch) | | **Package** | 20-lead TSSOP_EP (Exposed Pad) | --- ### 2. Core Functional Components The device is integrated with several internal electronic blocks to ensure stable power delivery: * **PWM Controllers:** Two independent Pulse Width Modulation controllers manage the duty cycles for the boost and inverting stages. * **Internal MOSFETs:** It features integrated power switches, reducing the need for external power transistors and saving PCB space. * **Soft Start & Sequencing:** Internal circuitry allows for a controlled ramp-up of output voltages to prevent inrush current spikes. * **SYNC Input:** Allows the chip to be synchronized with an external clock to minimize electromagnetic interference (EMI) in sensitive systems. --- ### 3. Application Use Cases The ADP5071 is highly popular in precision analog systems where bipolar (positive and negative) power is required: 1. **ADC/DAC Powering:** Providing clean $\pm$15V rails for high-speed converters. 2. **Operational Amplifiers:** Powering dual-rail Op-Amps for audio or sensor signal conditioning. 3. **LCD Bias:** Generating the necessary positive and negative voltages for display backplanes. 4. **RF Systems:** Used in handheld devices where battery voltage must be boosted and inverted for RF components. --- ### 4. Part Number Breakdown (ADP5071AREZ-R7) * **ADP5071:** The base model/series number. * **A:** Performance/Temperature grade (usually standard industrial). * **RE:** Package code for TSSOP (Thin Shrink Small Outline Package). * **Z:** RoHS compliant (Lead-free). * **R7:** Packaging format (7-inch Tape and Reel, typically 1,000 units). --- ### 5. Typical External Components To function, the ADP5071 requires a few critical external components: * **Inductors ($L$):** One for the boost side and one for the inverting side to store energy. * **Schottky Diodes ($D$):** Required for the rectification of the switching signals. * **Feedback Resistors ($R_{fb}$):** Used to set the specific output voltage levels. * **Capacitors ($C$):** Input and output ceramic capacitors for ripple filtering.