The **ADP172ACBZ-1.5-R7** is a high-performance, low dropout (LDO) linear regulator manufactured by Analog Devices. It is specifically designed for space-constrained and power-sensitive applications like smartphones and portable medical devices. --- ### ## Technical Specifications Overview The following table summarizes the key electrical characteristics of the device: | Parameter | Specification | | :--- | :--- | | **Output Voltage (Fixed)** | 1.5 V | | **Input Voltage Range** | 1.6 V to 3.6 V | | **Maximum Output Current** | 300 mA | | **Dropout Voltage** | 50 mV (at 300 mA Load) | | **Quiescent Current (No Load)** | 23 µA | | **PSRR (at 1 kHz)** | 70 dB | | **Package Type** | 4-ball WLCSP (Wafer Level Chip Scale Package) | | **Operating Temperature** | -40°C to +125°C | --- ### ## Key Features 1. **Low Dropout Voltage:** With a dropout of only 50 mV at full load, it allows for efficient power conversion even when the input voltage is very close to the output voltage. 2. **Low Quiescent Current:** The 23 µA ground current extends battery life in portable electronics during standby modes. 3. **High PSRR:** The Power Supply Rejection Ratio (PSRR) of 70 dB ensures that noise from the input power source (like a switching regulator) is effectively filtered out. 4. **Stability:** It is stable with small 1 µF ceramic input and output capacitors, reducing the overall PCB footprint. 5. **Protection Circuits:** Includes thermal overload protection and short-circuit protection to prevent damage during fault conditions. --- ### ## Pin Configuration (4-Ball WLCSP) The device uses a tiny 0.95 mm x 1.03 mm footprint. The pinout is typically arranged as follows: * **VIN:** Input Voltage Supply. * **VOUT:** Regulated Output Voltage (1.5V). * **EN:** Enable Input. Drive high to turn on the regulator; drive low to put it in shutdown mode. * **GND:** Ground reference. --- ### ## Typical Applications * **Mobile Phones:** Powering sensitive RF or analog baseband circuits. * **Digital Cameras:** Providing clean power to image sensors. * **Portable Medical Equipment:** Handheld diagnostic tools. * **Post-Regulation:** Used after a DC-DC switching converter to "clean up" the ripples for noise-sensitive components.