The **UK2158G-AE2-R** is a specific low-dropout (LDO) linear regulator manufactured by **UTC (Unisonic Technologies)**. It is designed for battery-operated systems and portable electronics where power efficiency and space are critical. --- ## Technical Specifications | Parameter | Specification | |:---|:---| | **Part Number** | UK2158G-AE2-R | | **Component Type** | CMOS Low Dropout Regulator (LDO) | | **Output Voltage** | Typically Fixed (Refer to suffix for voltage) | | **Output Current** | 300mA (Maximum) | | **Package Type** | SOT-23-5 | | **Drop-out Voltage** | Very low (approx. 200mV at 300mA) | | **Shutdown Current** | Less than 1.0 µA | | **Special Features** | Over-current protection, Thermal shutdown | --- ## Key Features 1. **Low Quiescent Current:** It consumes very little power during operation, making it ideal for extending battery life in handheld devices. 2. **Stability with Low ESR Capacitors:** The internal compensation circuit allows the device to remain stable even when using small ceramic capacitors (low ESR). 3. **High Ripple Rejection:** It effectively filters out noise from the input power source, providing a clean DC output for sensitive analog circuits. 4. **Shutdown Function:** Includes an "Enable" pin that allows the system to turn the regulator off completely to save power. --- ## Pin Configuration (SOT-23-5) Typical pinout for this series: * **Pin 1 (VIN):** Input voltage supply. * **Pin 2 (GND):** Ground reference. * **Pin 3 (EN):** Enable/Shutdown (High = On, Low = Off). * **Pin 4 (NC/BP):** No connection or Bypass capacitor (for noise reduction). * **Pin 5 (VOUT):** Regulated output voltage. --- ## Part Number Decoding The suffix **"G-AE2-R"** provides specific manufacturing details: * **G:** Halogen-free and Lead-free (Green). * **AE2:** Refers to the **SOT-23-5** package style. * **R:** Tape and Reel packaging for automated SMT assembly. --- ## Common Applications * Mobile Phones / Smart Devices. * Battery-powered medical equipment. * Digital cameras. * Wireless communication modules (Bluetooth/Wi-Fi).