## Overview of ADP2291ARMZ-R7 The **ADP2291ARMZ-R7** is a high-performance, dual-output Low Dropout (LDO) linear regulator manufactured by Analog Devices. It is designed specifically for portable applications where board space and efficiency are critical. --- ### 1. Key Technical Specifications | Parameter | Specification | | :--- | :--- | | **Output Type** | Fixed (Dual Output) | | **Output Voltages** | 1.8V and 3.3V (Standard configuration) | | **Max Output Current** | 200 mA per channel | | **Input Voltage Range** | 2.5V to 5.5V | | **Dropout Voltage** | ~170 mV at 200 mA load | | **Package** | 8-Lead MSOP (Micro Small Outline Package) | | **Operating Temp** | -40°C to +125°C | --- ### 2. Core Features * **Dual Independent Outputs:** It integrates two separate LDOs into a single chip, reducing the total component count. * **Low Quiescent Current:** It draws very little power when active (~60 µA with both LDOs enabled), making it ideal for battery-powered devices. * **High PSRR (Power Supply Rejection Ratio):** It effectively filters out noise from the input power source, providing a clean voltage to sensitive analog components. * **Quick Enable/Disable:** Features individual enable pins for each output, allowing for sophisticated power-sequencing strategies. * **Safety Protections:** * **Thermal Overload Protection:** Shuts down if the chip overheats. * **Short-Circuit Protection:** Prevents damage during electrical faults. --- ### 3. Pin Configuration Summary | Pin No. | Name | Description | | :--- | :--- | :--- | | 1 | **VIN** | Regulator Input Supply. | | 2 | **EN1** | Enable input for LDO1 (Active High). | | 3 | **EN2** | Enable input for LDO2 (Active High). | | 4 | **GND** | Ground. | | 5 | **VOUT2** | Regulated Output Voltage 2. | | 6 | **VOUT1** | Regulated Output Voltage 1. | --- ### 4. Typical Applications The ADP2291 is commonly found in the following electronic systems: 1. **Mobile Phones:** Powering digital cameras and audio circuits. 2. **Portable Medical Equipment:** Handheld diagnostic tools. 3. **Wireless Sensor Nodes:** Low-power IoT (Internet of Things) devices. 4. **GPS Handsets:** Providing stable power to sensitive RF modules. ---