## Technical Overview of ADP172ACBZ-1.65-R7 The **ADP172ACBZ-1.65-R7** is a low dropout (LDO) linear regulator manufactured by Analog Devices. It is designed for portable and wireless applications where space and power efficiency are critical. --- ### 1. Key Specifications | Parameter | Value | | :--- | :--- | | **Output Voltage** | 1.65 V (Fixed) | | **Input Voltage Range** | 1.6 V to 3.6 V | | **Maximum Output Current** | 300 mA | | **Dropout Voltage** | 50 mV @ 300 mA Load | | **Quiescent Current (No Load)** | 23 µA | | **Package Type** | 4-ball WLCSP (Wafer Level Chip Scale Package) | | **Operating Temperature** | -40°C to +125°C | --- ### 2. Core Functional Features * **Low Dropout Voltage:** Because it only requires 50 mV of "headroom" to maintain regulation at full load, it is highly efficient and extends battery life. * **High PSRR:** It features high Power Supply Rejection Ratio (70 dB at 1 kHz), which helps filter out noise from upstream switching power supplies. * **Stability:** It is stable with small 1 µF ceramic input and output capacitors, allowing for a very small PCB footprint. * **Enable Pin:** Includes a dedicated enable input to switch the device into a shutdown mode, reducing current consumption to less than 1 µA. --- ### 3. Pin Configuration (WLCSP) The device uses a 4-ball grid arrangement: | Ball | Symbol | Description | | :--- | :--- | :--- | | **A1** | **VIN** | Regulator Input Supply. | | **A2** | **VOUT** | Regulated Output Voltage (1.65V). | | **B1** | **EN** | Enable Input (High = On, Low = Off). | | **B2** | **GND** | Ground. | --- ### 4. Typical Application Circuit ```text [Input 1.6V-3.6V] ----[ VIN ]-------[ VOUT ]---- [Output 1.65V] | | [ 1uF ] [ 1uF ] | | [Ground] --------------[ GND ]-------[ GND ] | [Logic High/Low] ------[ EN ] ``` ### 5. Common Use Cases * **Mobile Phones:** Powering sensitive RF or analog baseband circuits. * **Digital Cameras:** Providing clean power to image sensors. * **Wearables:** Due to the extremely small WLCSP footprint. * **Portable Medical Devices:** Where high reliability and low power consumption are required. ---