### ADP2370ACPZ-2.5-R7: High Efficiency Buck Regulator The **ADP2370ACPZ-2.5-R7** is a high-efficiency, low quiescent current, step-down (buck) DC-to-DC regulator manufactured by Analog Devices. It belongs to a family of regulators designed for high performance in compact, battery-powered applications. --- ### 1. Key Technical Specifications | Parameter | Specification | |:--- |:--- | | **Output Voltage** | Fixed **2.5V** | | **Input Voltage Range** | 3.2V to 15V | | **Output Current** | 800 mA | | **Switching Frequency** | 600 kHz or 1.2 MHz (Pin selectable) | | **Quiescent Current** | 14 µA (Typical, no load) | | **Efficiency** | Up to 95% | | **Package** | 8-Lead LFCSP (3mm x 3mm) | --- ### 2. Core Features * **Fixed Output:** This specific variant is factory-trimmed to a **2.5V output**, eliminating the need for external feedback resistors. * **Low Quiescent Current:** At only 14 µA in non-switching mode, it is ideal for "always-on" systems that need to preserve battery life. * **Power Good Flag:** Includes an integrated power-good output to monitor the status of the output voltage. * **MODE Pin:** Allows the user to switch between **PWM mode** (for low noise) and **PSM (Power Save Mode)** (for high efficiency at light loads). * **Synchronization:** Can be synchronized to an external clock to mitigate system noise. --- ### 3. Electronic Architecture & Pins | Pin Name | Description | |:--- |:--- | | **VIN** | Main input power supply. | | **VOUT** | Regulated 2.5V output sense point. | | **SW** | Switch node; connects to the external inductor. | | **PGND / AGND** | Power and Analog grounds. | | **EN** | Enable input. Pull high to turn on the device. | | **PG** | Power Good open-drain output. | | **MODE/SYNC** | Selects operational mode or accepts external clock signal. | --- ### 4. Typical Application Circuit To implement this part, the following basic components are required: 1. **Inductor ($L$):** Typically $4.7\mu H$ to $10\mu H$. 2. **Input Capacitor ($C_{IN}$):** $10\mu F$ ceramic. 3. **Output Capacitor ($C_{OUT}$):** $22\mu F$ ceramic. ```text Input (3.2V-15V) ----[Cin]----(VIN) (SW)----[Inductor]---- Output (2.5V) | | | (GND) (VOUT)<---------+----[Cout]----(GND) ``` --- ### 5. Common Applications * **Portable Medical Devices:** Where long battery life and small form factors are critical. * **Industrial Sensors:** High input voltage range (up to 15V) allows use in 12V industrial rails. * **Wearable Electronics:** Low heat dissipation and high efficiency at light loads. * **Communication Equipment:** Low noise PWM mode for sensitive RF components.