The **ADP151ACBZ-1.5-R7** is a high-performance, ultra-low noise, low dropout (LDO) linear regulator manufactured by Analog Devices. It is specifically designed to provide stable power to noise-sensitive analog and mixed-signal circuits. --- ### 1. Key Technical Specifications | Parameter | Specification | | :--- | :--- | | **Input Voltage Range** | 2.2V to 5.5V | | **Output Voltage (Fixed)** | 1.5V | | **Maximum Output Current** | 200 mA | | **Dropout Voltage** | 140 mV (at 200 mA load) | | **PSRR (Power Supply Rejection Ratio)** | 70 dB at 10 kHz | | **RMS Output Noise** | 9 µV (10 Hz to 100 kHz) | | **Quiescent Current (No Load)** | 10 µA | | **Package Type** | 4-ball WLCSP (Wafer Level Chip Scale Package) | --- ### 2. Functional Features * **Ultra-Low Noise:** The extremely low noise floor (9 µV) makes it ideal for powering RF components, high-speed ADCs, and precision sensors without the need for additional bulky filters. * **Low Quiescent Current:** With only 10 µA of ground current at no load, it significantly extends battery life in portable electronics. * **Stability:** It is stable with tiny 1 µF ceramic input and output capacitors, allowing for a very small PCB footprint. * **Protection Circuitry:** * **Thermal Overload Protection:** Prevents damage from overheating. * **Short-Circuit Protection:** Protects the device and the load during fault conditions. --- ### 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 (1.5V) | | B1 | **EN** | Enable Input (High = On, Low = Off) | | B2 | **GND** | Ground | --- ### 4. Part Number Breakdown: `ADP151ACBZ-1.5-R7` * **ADP151:** Series model number (Ultra-low noise LDO). * **A:** Operating temperature range (-40°C to +125°C). * **CBZ:** Indicates the WLCSP package type (Lead-free). * **1.5:** Fixed output voltage of 1.5 Volts. * **R7:** Packaging format (7-inch reel, typically 3,000 units). --- ### 5. Typical Applications * Mobile phones and smartwatches. * Digital cameras and audio accessories. * Portable medical devices. * RF and VCO (Voltage Controlled Oscillator) power supplies.