LM334SM/NOPB

Product Overview

• Category: Integrated Circuit
• Use: Current Source/Sink
• Characteristics: Precision, Adjustable, Low Power
• Package: Surface Mount
• Essence: Monolithic 3-Terminal Adjustable Current Source
• Packaging/Quantity: Tape and Reel, 2500 units per reel

Specifications

• Operating Temperature Range: -40°C to +85°C
• Supply Voltage Range: 1V to 40V
• Output Current Range: 1µA to 10mA
• Adjustment Pin Current: 100nA to 10µA
• Line Regulation: 0.01%/V
• Load Regulation: 0.1%/mA
• Temperature Stability: 50ppm/°C
• Initial Accuracy: ±3%
• Quiescent Current: 60µA

Detailed Pin Configuration

The LM334SM/NOPB has three pins:

1. ADJUST (Pin 1): This pin is used to adjust the output current. By connecting a resistor between this pin and the positive supply voltage, the desired current can be set.
2. OUTPUT (Pin 2): The regulated output current is sourced or sunk from this pin.
3. GND (Pin 3): This pin is connected to the ground reference.

Functional Features

• Precise and adjustable current source/sink.
• Wide operating temperature range.
• Low power consumption.
• High stability and accuracy.
• Easy to use with external resistors for current adjustment.

Advantages

• Provides a stable and accurate current source/sink for various applications.
• Wide operating temperature range allows usage in extreme environments.
• Low power consumption makes it suitable for battery-powered devices.
• Adjustable output current offers flexibility in design.

Disadvantages

• Limited output current range (1µA to 10mA).
• Initial accuracy may not be sufficient for highly precise applications.
• Requires external resistors for current adjustment, adding complexity to the circuit.

Working Principles

The LM334SM/NOPB is a monolithic 3-terminal adjustable current source. It operates by utilizing an internal bandgap voltage reference and a temperature-compensated biasing network. The output current is determined by the voltage applied to the ADJUST pin and the value of the external resistor connected between the ADJUST pin and the positive supply voltage.

Detailed Application Field Plans

The LM334SM/NOPB finds applications in various fields, including:

1. Battery Charging: It can be used as a constant current source for charging batteries, ensuring a controlled charging process.
2. LED Driver: The LM334SM/NOPB can drive LEDs with a precise and stable current, maintaining consistent brightness.
3. Sensor Biasing: It is suitable for providing a stable bias current to sensors, ensuring accurate measurements.
4. Temperature Compensation: The LM334SM/NOPB can be used to compensate for temperature variations in circuits, maintaining stability.

Detailed and Complete Alternative Models

1. LM134/LM234/LM334: These are similar devices from Texas Instruments with different package options.
2. LT3092: A precision current source/sink from Linear Technology with adjustable output current.
3. MAX4372TEUK+: An alternative current source/sink from Maxim Integrated with adjustable output current and low quiescent current.

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