LM337IMP 3-Terminal Adjustable Negative Regulators led circuit board power ic chip

3-Terminal Adjustable Negative Regulators

Features

► Output voltage adjustable from −1.2V to −37V

► 1.5A output current guaranteed, −55˚C to +150˚C

► Line regulation typically 0.01%/V

► Load regulation typically 0.3%

► Excellent thermal regulation, 0.002%/W

► 77 dB ripple rejection

► Excellent rejection of thermal transients

► 50 ppm/˚C temperature coefficient

► Temperature-independent current limit

► Internal thermal overload protection

► P+ Product Enhancement tested

► Standard 3-lead transistor package

► Output is short circuit protected

General Description

The LM137/LM337 are adjustable 3-terminal negative voltage regulators capable of supplying in excess of −1.5A over an output voltage range of −1.2V to −37V. These regulators are exceptionally easy to apply, requiring only 2 external resistors to set the output voltage and 1 output capacitor for frequency compensation. The circuit design has been optimized for excellent regulation and low thermal transients. Further, the LM137 series features internal current limiting, thermal shutdown and safe-area compensation, making them virtually blowout-proof against overloads.

The LM137/LM337 serve a wide variety of applications including local on-card regulation, programmable-output voltage regulation or precision current regulation. The LM137/ LM337 are ideal complements to the LM117/LM317 adjustable positive regulators.

Thermal Regulation

When power is dissipated in an IC, a temperature gradient occurs across the IC chip affecting the individual IC circuit components. With an IC regulator, this gradient can be especially severe since power dissipation is large. Thermal regulation is the effect of these temperature gradients on output voltage (in percentage output change) per Watt of power change in a specified time. Thermal regulation error is independent of electrical regulation or temperature coefficient, and occurs within 5 ms to 50 ms after a change in power dissipation. Thermal regulation depends on IC layout as well as electrical design. The thermal regulation of a voltage regulator is defined as the percentage change of VOUT, per Watt, within the first 10 ms after a step of power is applied. The LM137’s specification is 0.02%/W, max.

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