The **ADP2503ACPZ-2.8-R7** is a high-efficiency, low quiescent current step-down/step-up (Buck-Boost) DC-to-DC converter manufactured by Analog Devices. It is specifically designed for applications where the input voltage can be higher than, equal to, or lower than the regulated output voltage. --- ### ## Technical Specifications | Parameter | Specification | | :--- | :--- | | **Output Voltage (Fixed)** | 2.8 V | | **Input Voltage Range** | 2.3 V to 5.5 V | | **Output Current** | Up to 600 mA | | **Switching Frequency** | 2.5 MHz | | **Package / Case** | 10-WFDFN Exposed Pad (LFCSP) | | **Efficiency** | Up to 95% | | **Operating Temperature** | -40°C to +125°C | --- ### ### Key Features 1. **Seamless Transition:** The device uses a proprietary architecture that allows for a smooth transition between buck (step-down) and boost (step-up) modes without output glitches. 2. **High Frequency:** Operating at 2.5 MHz allows for the use of tiny, low-profile inductors and ceramic capacitors, reducing the overall PCB footprint. 3. **Power Saving Mode:** It features a selectable "Power Save Mode" (PSM) which increases efficiency during light load conditions by reducing switching frequency. 4. **Protection Circuits:** Includes internal compensation, soft start, over-temperature protection, and current limit protection. --- ### ### Pin Configuration Summary | Pin Name | Function | | :--- | :--- | | **VIN** | Input Voltage Source. | | **VOUT** | Regulated Output Voltage (2.8V). | | **SW1 / SW2** | Switching nodes connected to the inductor. | | **GND** | Ground reference. | | **EN** | Enable input. Drive high to turn on the device. | | **MODE** | Logic input to toggle between PWM-only or Power Save Mode. | --- ### ### Typical Application Circuit To implement this part, a basic external circuit is required: ```mermaid graph LR Vin(Input 2.3-5.5V) --> Cin[Input Capacitor] Cin --> ADP2503 ADP2503 <--> L1[Inductor 1.0uH] ADP2503 --> Cout[Output Capacitor] Cout --> Vout(2.8V Output) ``` 1. **Inductor:** Typically a 1.0 µH or 1.5 µH inductor. 2. **Capacitors:** Low ESR ceramic capacitors (typically 10 µF) are recommended for both input and output filtering to minimize ripple. ---