## Technical Overview of ADP172ACBZ-1.26-R7 The **ADP172ACBZ-1.26-R7** is a low dropout (LDO) linear regulator manufactured by Analog Devices. It is specifically designed for high-performance analog and mixed-signal applications where low noise and high power supply rejection ratio (PSRR) are critical. --- ### 1. Key Technical Specifications The following table summarizes the primary electrical characteristics of this specific component: | Parameter | Value / Description | | :--- | :--- | | **Manufacturer** | Analog Devices | | **Output Voltage** | 1.26 V (Fixed) | | **Input Voltage Range** | 1.6 V to 3.6 V | | **Maximum Output Current** | 300 mA | | **Dropout Voltage** | ~50 mV at 300 mA load | | **PSRR** | 73 dB at 1 kHz | | **Quiescent Current** | 23 µA (Typical at no load) | | **Package Type** | 4-ball WLCSP (Wafer Level Chip Scale Package) | --- ### 2. Core Functional Features * **Low Dropout Voltage:** Its ultra-low dropout allows the device to maintain regulation even when the input voltage is very close to the output voltage, which maximizes battery life. * **High PSRR:** It effectively filters out noise from the input power supply, making it ideal for powering sensitive RF or audio components. * **Soft Start Capability:** It includes internal circuitry to control the rate of output voltage rise, preventing large inrush currents during startup. * **Protective Features:** * **Thermal Overload Protection:** Prevents damage from overheating. * **Short-Circuit Protection:** Limits current if the output is grounded. --- ### 3. Pin Configuration (WLCSP) The device uses a very small footprint (4-ball grid). Typical pin assignments for the ADP172 series include: | Ball | Symbol | Description | | :--- | :--- | :--- | | **A1** | **VIN** | Regulator Input Supply | | **A2** | **VOUT** | Regulated Output Voltage | | **B1** | **EN** | Enable Input (High = On, Low = Off) | | **B2** | **GND** | Ground | --- ### 4. Typical Application Circuit To operate the ADP172, only two external capacitors are typically required for stability: ```text Input (VIN) ----[ C_IN: 1uF ]----( ADP172 )----[ C_OUT: 1uF ]---- Output (1.26V) | [GND] ``` --- ### 5. Common Applications * Mobile phones and smartphones. * Digital cameras and audio equipment. * Portable Medical devices. * Post-regulation for DC-to-DC converters.