## LD2985G-C6-AF5-R: Part Overview The **LD2985G-C6-AF5-R** is a specific variant of a Low Dropout (LDO) linear voltage regulator. It is designed for low-power, high-precision applications, commonly manufactured by UTC (Unisonic Technologies Co.). --- ### 1. Part Number Breakdown Understanding the suffix codes helps identify the specific electrical and physical characteristics of this component. | Code Segment | Description | | :--- | :--- | | **LD2985** | Base Part Number (Low Dropout Linear Regulator) | | **G** | Halogen-Free and Lead-Free (Green) | | **C6** | Fixed Output Voltage (typically 3.6V for this specific code) | | **AF5** | Package Type (SOT-25 / SOT-23-5) | | **R** | Packing Style (Tape & Reel) | --- ### 2. Key Technical Specifications Below are the typical electrical parameters for this series: | Parameter | Value / Range | | :--- | :--- | | **Input Voltage Range** | Up to 16V | | **Output Voltage** | 3.6V (Fixed) | | **Output Current** | 150mA (Continuous) | | **Dropout Voltage** | ~160mV at 100mA load | | **Quiescent Current** | 80µA (Typical) | | **Shutdown Current** | < 1µA | | **Operating Temperature** | -40°C to +125°C | --- ### 3. Core Features * **Low Noise:** High Ripple Rejection (PSRR), making it suitable for RF and sensitive analog circuits. * **ON/OFF Control:** Includes an Enable (EN) pin to put the device into standby mode, saving battery life. * **Internal Protection:** Features thermal shutdown protection and current limiting to prevent damage during faults. * **Stability:** Designed to be stable even with low-ESR ceramic capacitors. --- ### 4. Typical Pin Configuration (SOT-23-5) The **AF5** package corresponds to a 5-pin SOT-23 layout: 1. **V_IN:** Input Voltage. 2. **GND:** Ground. 3. **ON/OFF (EN):** Logic high enables the device; logic low shuts it down. 4. **BYPASS:** Connecting a small capacitor here reduces output noise. 5. **V_OUT:** Regulated Output Voltage. --- ### 5. Application Areas * Cellular phones and wireless handsets. * Battery-powered portable instruments. * Laptop and palmtop computers. * Low-voltage post-regulation for switching power supplies. ---