## ADP1762ACPZ1.25-R7: Low Dropout (LDO) Regulator The **ADP1762ACPZ1.25-R7** is a high-performance, low dropout linear regulator (LDO) designed by Analog Devices. It is specifically engineered to power noise-sensitive components such as high-speed ADCs, DACs, and precision analog circuitry. --- ### 1. Key Technical Specifications | Parameter | Specification | | :--- | :--- | | **Output Voltage (Fixed)** | 1.25 V | | **Maximum Output Current** | 2.0 A | | **Input Voltage Range** | 1.10 V to 1.98 V | | **Dropout Voltage** | 62 mV (typical at 2A) | | **Power Supply Rejection Ratio (PSRR)** | 62 dB at 10 kHz | | **Output Noise** | 2 μV rms (10 Hz to 100 kHz) | | **Operating Temperature** | -40°C to +125°C | | **Package** | 16-Lead LFCSP (3mm x 3mm) | --- ### 2. Functional Components and Features The internal architecture of the ADP1762 includes several critical electronic sub-systems: * **Ultra-Low Noise Architecture:** It utilizes a proprietary reference and error amplifier design to minimize thermal noise, making it ideal for RF and data conversion applications. * **Soft Start Capability:** A dedicated `SS` pin allows the connection of an external capacitor to program the startup time, reducing inrush current. * **Precision Enable (EN):** This pin allows the chip to be turned on or off with high logic precision, facilitating power sequencing. * **Power Good (PG) Indicator:** An open-drain output that signals when the output voltage has reached a stable regulated level (typically 92% of the nominal voltage). * **Thermal and Overcurrent Protection:** Built-in circuitry that shuts down the device if the junction temperature exceeds safety limits or if a short circuit occurs at the output. --- ### 3. Application Circuit Example A typical implementation requires minimal external components, primarily decoupling capacitors to ensure stability. ```c // Pseudo-Schematic Representation [Input Source (1.5V)] ----> [VIN Pin] | [10uF Ceramic Cap] | [GND] <------------------------+ [ADP1762] - VOUT Pin (1.25V) ----> [Load / Processor] - ADJ/REFE Pin ----> [Noise Bypass Cap] - SS Pin ----> [Soft Start Cap] - PG Pin ----> [Pull-up to VIO] ``` --- ### 4. Part Number Breakdown * **ADP1762:** The base model series (2A LDO). * **ACPZ:** Indicates the Lead-frame Chip Scale Package (LFCSP) and RoHS compliance (Z). * **1.25:** Specifies the fixed output voltage of 1.25V. * **R7:** Indicates the packaging format (7-inch Reel, typically 1,500 units).