## ADP1764ACPZ0.95-R7: Low Noise, High Current LDO Regulator The **ADP1764ACPZ0.95-R7** is a high-performance, low dropout (LDO) linear regulator manufactured by Analog Devices. It is specifically designed to provide stable, low-noise power to noise-sensitive components like FPGAs, ASICs, and high-speed data converters. --- ### 1. Key Technical Specifications | Parameter | Specification | | :--- | :--- | | **Output Voltage (Fixed)** | 0.95 V | | **Maximum Output Current** | 4 Amperes (4A) | | **Input Voltage Range** | 1.10 V to 1.98 V | | **Dropout Voltage** | 47 mV (typical at 4A load) | | **Package Type** | 16-lead LFCSP (4mm x 4mm) | | **Operating Temperature** | -40°C to +125°C | | **PSRR (10 kHz)** | 69 dB | --- ### 2. Core Features and Functionality * **Low Dropout Voltage:** The device can maintain regulation even when the input voltage is only slightly higher than the output voltage. This minimizes power dissipation and increases efficiency. * **High Power Supply Rejection Ratio (PSRR):** It effectively filters out noise coming from the upstream power supply (such as a switching regulator), ensuring a "clean" 0.95V rail. * **Precision Enable:** Allows the regulator to be turned on or off via a logic signal, which is essential for power sequencing in complex systems. * **Power Good (PG) Flag:** An output pin that signals when the output voltage has reached a stable level, helping to trigger the next stage of a system boot-up. * **Soft Start:** Includes an internal soft-start mechanism to limit inrush current during startup, preventing voltage dips on the input rail. --- ### 3. Pinout and Internal Components The **16-lead LFCSP** package includes several critical pins: 1. **VIN:** Input supply pins (multiple pins are used to handle the 4A current). 2. **VOUT:** Regulated 0.95V output pins. 3. **EN:** Enable input. 4. **PG:** Power Good output (Open-drain). 5. **VREG:** Internal regulator output for bypass capacitor connection. 6. **SS:** Soft-start capacitor connection to adjust ramp time. 7. **Exposed Pad:** Must be soldered to the PCB ground plane for thermal dissipation. --- ### 4. Application Use-Cases The fixed 0.95V output is a common "core voltage" for modern semiconductor devices. Common applications include: * **Networking Equipment:** Powering high-speed processing cores in switches and routers. * **Medical Imaging:** Providing low-noise power to sensitive analog-to-digital converters (ADCs). * **RF Transceivers:** Supplying power to Phase-Locked Loops (PLLs) where noise can cause jitter. * **FPGA Core Rails:** Providing the high current required by large-scale FPGAs (e.g., Xilinx or Intel/Altera) at precise voltages. ---