## Technical Overview of ADP5090ACPZ-1-R7 The **ADP5090ACPZ-1-R7** is an ultra-low power, high-efficiency energy harvesting PMIC (Power Management Integrated Circuit) designed by Analog Devices. It is specifically engineered to bridge the gap between small energy harvesters (like solar cells or thermoelectric generators) and storage elements (batteries or capacitors). --- ### 1. Key Technical Specifications | Parameter | Specification | | :--- | :--- | | **Input Voltage Range** | 80 mV to 3.3 V | | **Minimum Cold Start Voltage** | 380 mV | | **Quiescent Current** | 390 nA (Typical) | | **Package** | 16-Lead LFCSP (3mm x 3mm) | | **Operating Temperature** | -40°C to +125°C | | **Conversion Type** | Boost Regulator | --- ### 2. Core Functional Components The chip contains several specialized electronic subsystems to handle erratic energy sources: #### A. Boost Regulator & MPPT The device features a high-efficiency synchronous boost regulator. It includes **Maximum Power Point Tracking (MPPT)**, which ensures the harvester operates at its peak power output by sensing the open-circuit voltage periodically. #### B. Cold Start Circuit Because the harvester voltage is often too low to power the internal logic, the **Cold Start** circuit allows the device to begin charging a storage element from an input as low as **380 mV**. Once the storage reaches a threshold, the high-efficiency main booster takes over. #### C. Power Management Logic * **DIS_SW (Discharge Switch):** Protects the battery by preventing over-discharge. * **PGOOD (Power Good):** A digital signal to inform an external MCU that the voltage is stable enough for operation. * **BACK_UP:** An integrated power path that allows an optional primary battery to take over if the harvester stops providing energy. --- ### 3. Pin Configuration and Roles | Pin Name | Function | | :--- | :--- | | **VIN** | Input from the energy harvester (Solar/TEG). | | **SYS** | Output to the system load. | | **BAT** | Connection point for the storage element (Li-ion, Capacitor). | | **MPPT** | Connection for the resistor divider that sets the MPPT ratio. | | **LBOOST** | Connection for the external inductor (essential for the boost circuit). | --- ### 4. Typical Application Diagram (Conceptual) ```mermaid graph LR Solar[Solar Cell] -->|VIN| ADP5090 ADP5090 -->|LBOOST| Inductor[10uH Inductor] ADP5090 -->|BAT| Storage[Supercapacitor/Battery] ADP5090 -->|SYS| MCU[Microcontroller/Sensors] ``` --- ### 5. Primary Use Cases * **IoT Sensors:** Remote nodes powered by indoor lighting. * **Wearables:** Devices capturing body heat or kinetic energy. * **Wireless Switches:** Self-powered smart home devices.