LM334M/NOPB

Product Overview

• Category: Integrated Circuit (IC)
• Use: Current Source
• Characteristics: Adjustable, Precision, Low Dropout Voltage
• Package: SOIC (Small Outline Integrated Circuit)
• Essence: The LM334M/NOPB is a three-terminal adjustable current source designed to operate from a wide range of input voltages.
• Packaging/Quantity: Available in reels of 2500 units or tubes of 50 units.

Specifications

• Input Voltage Range: 1V to 40V
• Output Current Range: 1µA to 10mA
• Temperature Range: -40°C to +125°C
• Line Regulation: 0.01%/V
• Load Regulation: 0.1%/mA
• Dropout Voltage: 0.4V typical at 1mA
• Quiescent Current: 100µA typical

Pin Configuration

The LM334M/NOPB has three pins:

1. Pin 1 (ISET): This pin is used to set the desired output current by connecting a resistor between this pin and the positive supply voltage.
2. Pin 2 (V+): This pin is connected to the positive supply voltage.
3. Pin 3 (V-): This pin is connected to the negative supply voltage or ground.

Functional Features

• Adjustable Output Current: The LM334M/NOPB allows for precise adjustment of the output current within the specified range.
• Temperature Stability: The device maintains a stable output current over a wide temperature range.
• Low Dropout Voltage: The low dropout voltage ensures efficient operation even with low input voltages.
• Wide Input Voltage Range: The LM334M/NOPB can operate from 1V to 40V, making it suitable for various applications.

Advantages and Disadvantages

Advantages: - Precise current control - Wide input voltage range - Temperature stability

Disadvantages: - Limited output current range (1µA to 10mA) - Requires an external resistor for current setting

Working Principles

The LM334M/NOPB is based on a bandgap reference circuit that generates a stable voltage across a temperature-stable resistor. This voltage is then used to set the desired output current by connecting a resistor between the ISET pin and the positive supply voltage. The device regulates the current flowing through this resistor, thus maintaining a constant output current.

Detailed Application Field Plans

The LM334M/NOPB finds applications in various fields, including:

1. Battery Charging: It can be used as a current source for charging batteries, ensuring a controlled and precise charging process.
2. LED Driver: The LM334M/NOPB can drive LEDs with a constant current, preventing overcurrent and ensuring consistent brightness.
3. Sensor Biasing: It can provide a stable current for biasing sensors, ensuring accurate measurements.
4. Analog Circuit Calibration: The LM334M/NOPB can be used to calibrate analog circuits by providing a known and stable current reference.

Detailed and Complete Alternative Models

Some alternative models to the LM334M/NOPB include:

1. LM134: Similar functionality but available in TO-46 metal can package.
2. LM336: Provides a fixed output voltage instead of a current source.
3. LT3092: Offers higher output current capability and additional features like thermal shutdown and adjustable voltage reference.

These alternative models can be considered based on specific application requirements.

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