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LM337MP
3-Terminal Adjustable Negative Regulator
LM137/LM337
3-Terminal Adjustable Negative Regulators
General DescriptionThe LM137/LM337 are adjustable 3-terminal negative volt-
age regulators capableof supplyingin excessof −1.5A over output voltage rangeof −1.2Vto −37V. These regulators
are exceptionally easyto apply, requiring only2 external
resistorstosetthe output voltage and1 output capacitorfor
frequency compensation. The circuit design has been opti-
mizedfor 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 servea wide varietyof applicationsin-
cluding local on-card regulation, programmable-output volt-
age regulationor precision current regulation. The LM137/
LM337 are ideal complements to the LM117/LM317
adjustable positive regulators.
Features Output voltage adjustable from −1.2Vto −37V 1.5A output current guaranteed, −55˚Cto +150˚C Line regulation typically 0.01%/V Load regulation typically 0.3% Excellent thermal regulation, 0.002%/W77dB ripple rejection Excellent rejectionof thermal transients50 ppm/˚C temperature coefficient Temperature-independent current limit Internal thermal overload protectionP+ Product Enhancement tested Standard 3-lead transistor package Outputis short circuit protected
LM137 Series Packages and Power Capability
Rated Design
Device Package Power Load
Dissipation CurrentLM137/337 TO-3(K) 20W 1.5A
TO-39(H) 2W 0.5A
LM337 TO-220(T) 15W 1.5A
LM337 SOT-223
(MP) 1A
Typical Applications
Adjustable Negative Voltage RegulatorFull output currentnot availableat high input-output voltages
†C1=1μF solid tantalumor10μF aluminum electrolytic requiredfor
stability
*C2=1μF solid tantalumis requiredonlyif regulatoris more than4" from
power-supply filter capacitor
Output capacitorsinthe rangeof1μFto 1000μFof aluminumor tantalum
electrolyticare commonly usedto provide improved output impedanceand
rejectionof transients
Comparison between SOT-223 and
D-Pak (TO-252) PackagesScale 1:1
November 2001
LM137/LM337
3-T
erminal
Adjustable
Negative
Regulators
