The **ADP172ACBZ-3.0-R7** is a low dropout (LDO) linear regulator manufactured by Analog Devices. It is specifically designed for portable, battery-powered applications where space and power efficiency are critical. ### 1. Key Technical Specifications | Parameter | Specification | | :--- | :--- | | **Output Voltage** | 3.0V (Fixed) | | **Input Voltage Range** | 1.6V to 3.6V | | **Max Output Current** | 300 mA | | **Dropout Voltage** | 50 mV @ 100 mA load | | **Quiescent Current** | 23 µA (Typical at no load) | | **PSRR** | 73 dB at 1 kHz | | **Package Type** | 4-ball WLCSP (Wafer Level Chip Scale Package) | --- ### 2. Functional Description The device serves as a voltage stabilizer, converting a fluctuating or higher input voltage into a steady 3.0V output. * **Low Quiescent Current:** It consumes very little power internally, which extends the battery life of handheld devices. * **High PSRR:** Power Supply Rejection Ratio (PSRR) measures the device's ability to block noise from the input power source. At 73 dB, it provides a very "clean" output, making it ideal for sensitive analog components. * **Enable Pin (EN):** Includes a logic-controlled shutdown mode. When the EN pin is pulled low, the device enters a state where it consumes less than 1 µA. --- ### 3. Physical Attributes (WLCSP Package) The "ACBZ" suffix indicates the **WLCSP** package. This is one of the smallest form factors available: * **Size:** Approximately 0.95 mm x 1.03 mm. * **Bumps:** It uses 4 solder balls (0.5 mm pitch) instead of traditional leads. * **Integration:** Because it is so small, it is typically used in smartphones, digital cameras, and wearable technology. --- ### 4. Typical Application Circuit To operate correctly, the ADP172 requires only two small external ceramic capacitors. ```mermaid graph LR Vin[Input Voltage] --> Cin[1uF Capacitor] Cin --> ADP[ADP172] ADP --> Cout[1uF Capacitor] Cout --> Vout[3.0V Output] EN[Enable Signal] --> ADP ``` --- ### 5. Part Number Breakdown * **ADP172:** Model series (300 mA LDO). * **A:** Operating temperature range (-40°C to +125°C). * **CBZ:** Package code for WLCSP. * **3.0:** Fixed output voltage of 3.0V. * **R7:** Packaging format (7-inch Tape and Reel, typically 3000 units).