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The adjustable negative voltage regulator LM337 is a three-terminal integrated circuit designed to provide a regulated negative output with high accuracy and reliability. This linear regulator delivers an adjustable output voltage in the range of −1.2 V to −37 V, supporting currents up to 1.5 A, making it an ideal choice for dual power supplies, negative bias systems and symmetrical circuits.
With its simple architecture, it requires only two external resistors to set the output voltage (voltage divider) and one output capacitor to ensure stability and spike rejection. It also integrates thermal protection, current limiting and safe-area compensation, ensuring safe operation even under overload or short-circuit conditions.
This regulator is widely used in applications such as:
Key advantages include excellent line and load regulation, inherently low noise (low ripple), and strong thermal stability to minimise voltage drift with temperature.
In summary, this adjustable negative regulator is a flexible and robust alternative to fixed regulators, ideal for designers and manufacturers needing a versatile solution for precision negative voltages.
Specifications
Adjustable output voltage range: −1.2 V to −37 V
Maximum output current: 1.5 A
Internal protections: current limiting, thermal shutdown, safe-area compensation
Line regulation: typical 0.01 %
Load regulation: typical 0.3 %
Ripple rejection: typical 77 dB (at 100 Hz)
Noise: 1,110 µV RMS (typical)
Dropout voltage: ≈ 2.0 V typical
Operating temperature: 0 °C to 125 °C
Maximum input voltage: up to 40 V differential between input and output
Thermal resistance (θJA): ≈ 23 °C/W
Internal reference voltage: about 1.25 V between output and adjustment pin (ADJ)
Available packages: TO-220, TO-263, TO-252 and other standard 3-pin formats
Thermal coefficient: ~ 50 ppm/°C typical
Thermal regulation: 0.002 %/W typical
Typical applications: on-board local regulation, adjustable negative supplies, bias circuits, symmetrical power supplies.
