Precision Micropower Low Dropout Voltage Reference The **LM4121AIM5-ADJ** is a precision voltage reference manufactured by **National Semiconductor (now part of Texas Instruments)**. Below are its key specifications, descriptions, and features:
### **Specifications:**
- **Output Voltage:** Adjustable (1.242V to 5.0V)
- **Initial Accuracy:** ±0.2% (max)
- **Temperature Coefficient:** 50 ppm/°C (max)
- **Output Current:** 15 mA (max)
- **Dropout Voltage:** 300 mV (typical)
- **Operating Temperature Range:** -40°C to +125°C
- **Package:** SOT-23-5 (Miniature Surface-Mount)
- **Supply Voltage Range:** 1.8V to 5.5V
- **Long-Term Stability:** 50 ppm/1000 hours (typical)
- **Line Regulation:** 0.02%/V (typical)
- **Load Regulation:** 0.05%/mA (typical)
### **Descriptions:**
- The **LM4121AIM5-ADJ** is a low-dropout (LDO) precision voltage reference with an adjustable output.
- It is designed for applications requiring high accuracy and stability over temperature and time.
- The device features low noise and low power consumption, making it suitable for battery-powered systems.
### **Features:**
- **High Precision:** ±0.2% initial accuracy.
- **Low Temperature Drift:** 50 ppm/°C ensures stable performance across temperature variations.
- **Low Dropout Voltage:** 300 mV enables operation in low-voltage systems.
- **Wide Supply Range:** Operates from 1.8V to 5.5V.
- **Low Noise:** Optimized for noise-sensitive applications.
- **Adjustable Output:** Allows flexibility in setting the desired reference voltage.
- **Small Footprint:** SOT-23-5 package saves board space.
- **Low Quiescent Current:** Ideal for power-sensitive designs.
This device is commonly used in **ADCs, DACs, power supplies, industrial controls, and portable electronics**.
*(Note: Since National Semiconductor was acquired by Texas Instruments, datasheets and support may now be available through TI.)*
