The **ADP1764ACPZ0.85-R7** is a high-performance, low dropout (LDO) linear regulator manufactured by Analog Devices. It is specifically designed to provide high output current with ultra-low noise, making it ideal for noise-sensitive high-speed analog and mixed-signal circuits. --- ### ## Technical Specifications The following table summarizes the core electronic characteristics of the ADP1764: | Parameter | Specification | | :--- | :--- | | **Input Voltage Range** | 1.10 V to 1.98 V | | **Output Voltage (Fixed)** | 0.85 V | | **Maximum Output Current** | 4.0 A | | **Dropout Voltage** | 45 mV (typical at 4A load) | | **PSRR (at 10 kHz)** | 69 dB | | **Operating Temperature** | -40°C to +125°C | | **Package Type** | LFCSP-16 (4mm x 4mm) | --- ### ## Key Electronic Features 1. **Low Dropout (LDO) Operation**: The device can maintain a stable 0.85V output even when the input voltage is only slightly higher (as low as 45mV difference), reducing power dissipation and heat. 2. **Soft Start (SS)**: It features a programmable soft-start capability. By connecting a capacitor to the SS pin, the user can control the ramp-up time of the output voltage to prevent inrush current. 3. **Power Good (PG)**: An open-drain output that signals when the output voltage is stable and within regulation (typically 90% of the nominal value). 4. **Low Noise Performance**: With an output noise of approximately 2 μV rms (from 10 Hz to 100 kHz), it is suitable for powering sensitive ADCs, DACs, and RF components. 5. **Precision Enable**: The enable input has a high-precision threshold, allowing the regulator to be used for power sequencing in multi-rail systems. --- ### ## Pin Configuration Overview The **LFCSP-16** package provides several critical pins for stability and control: * **VIN**: Input power source. * **VOUT**: Regulated 0.85V output. * **VBIAS**: A secondary input voltage (typically 2.3V to 5.5V) required to power the internal control circuitry, allowing the VIN to stay very low. * **EN**: Enable pin to turn the device on/off. * **SS**: Soft-start pin for timing capacitors. * **PG**: Power Good indicator pin. * **Exposed Pad**: Must be soldered to the PCB ground plane for thermal dissipation. --- ### ## Typical Application Circuit The ADP1764 requires minimal external components for operation: ```text Input (1.1V) ----[ CIN: 22uF ]---- VIN | ADP1764 | Output (0.85V) --[ COUT: 47uF ]--- VOUT | Bias (3.3V) -----[ CBIAS: 1uF ]--- VBIAS ```