Overview
The LM4121AIM5-1.2 from Texas Instruments is a precision bandgap voltage reference designed for high accuracy and low power consumption. This device is available in a fixed 1.25V output and an adjustable version, making it versatile for various applications. The LM4121 operates with input voltages as low as 1.8V and up to 12V, consuming a typical supply current of 160 µA. It features high output voltage accuracy, low temperature coefficient, and the ability to source and sink current up to ±5 mA.
Key Specifications
| Parameter | Conditions | Min | Typ | Max | Units |
|---|---|---|---|---|---|
| Output Voltage Initial Accuracy | - | ±0.2% (A Grade), ±0.5% (Standard) | - | - | % |
| Temperature Coefficient | -40°C ≤ TA ≤ +125°C | 14 | 50 | - | ppm/°C |
| Line Regulation | 1.8V ≤ VIN ≤ 12V | 0.0007 | 0.009 | 0.012 | %/V |
| Load Regulation | 0 mA ≤ ILOAD ≤ 5 mA | 0.01 | 0.04 | 0.17 | %/mA |
| Minimum Operating Voltage | ILOAD = 5 mA | 1.5 | 1.8 | - | V |
| Supply Current | - | 160 | 250 | 275 | µA |
| Power-down Supply Current | Enable = 0.4V | 1 | - | 2 | µA |
| Logic High Input Voltage | - | 1.6 | - | - | V |
| Logic Low Input Voltage | - | 0.4 | - | - | V |
Key Features
- High Output Voltage Accuracy: ±0.2% for Grade A and ±0.5% for Standard devices.
- Low Temperature Coefficient: 50 ppm/°C over the industrial temperature range.
- Source and Sink Current Capability: Up to ±5 mA.
- Low Supply Current: Typical 160 µA.
- Power-down Capability: Supply current drops to less than 2 µA in power-down mode.
- Enable Pin: Allows for easy on/off control.
- Small Package: Available in a standard 5-pin SOT-23 package.
- Industrial Temperature Range: Operates from -40°C to +85°C, with extended range options available.
Applications
- Portable, Battery Powered Equipment: Ideal for low power consumption and high accuracy requirements.
- Instrumentation and Process Control: Suitable for precise voltage referencing in measurement and control systems.
- Automotive & Industrial: Robust performance over a wide temperature range.
- Test Equipment: Used in various testing and calibration equipment.
- Data Acquisition Systems: Provides stable reference voltages for data acquisition applications.
- Precision Regulators: Used in precision voltage regulation circuits.
- Battery Chargers: Ensures accurate voltage levels for charging batteries.
- Base Stations: Reliable operation in communication base stations.
- Communications: Used in various communication systems requiring stable voltage references.
- Medical Equipment: Suitable for medical devices requiring high accuracy and reliability.
Q & A
- What is the output voltage accuracy of the LM4121AIM5-1.2?
The output voltage accuracy is ±0.2% for Grade A devices and ±0.5% for Standard devices.
- What is the typical supply current of the LM4121AIM5-1.2?
The typical supply current is 160 µA.
- What is the temperature coefficient of the LM4121AIM5-1.2?
The temperature coefficient is 50 ppm/°C over the industrial temperature range.
- Can the LM4121AIM5-1.2 source and sink current?
Yes, it can source and sink current up to ±5 mA.
- What is the minimum operating voltage for the LM4121AIM5-1.2?
The minimum operating voltage is 1.5V when ILOAD = 5 mA.
- How does the enable pin function on the LM4121AIM5-1.2?
The enable pin allows for on/off control of the device; pulling it to ground turns off the output.
- What is the power-down supply current of the LM4121AIM5-1.2?
In power-down mode, the supply current drops to less than 2 µA.
- What package type is the LM4121AIM5-1.2 available in?
It is available in a standard 5-pin SOT-23 package.
- What are some common applications of the LM4121AIM5-1.2?
Common applications include portable battery-powered equipment, instrumentation, automotive and industrial systems, test equipment, data acquisition systems, precision regulators, battery chargers, base stations, communications, and medical equipment.
- What is the industrial temperature range of the LM4121AIM5-1.2?
The device operates from -40°C to +85°C, with extended range options available.
