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LM137K-LM237SP-LM337K-LM337SP
THREE-TERMINAL ADJUSTABLE NEGATIVE VOLTAGE REGULATORS
LM137/LM237
LM337March 1993
NEGATIVE VOLTAGE REGULATORS
THREE-TERMINAL ADJUSTABLE OUTPUT VOLTAGE ADJUSTABLE DOWN TO
Vref. 1.5A GUARANTEED OUTPUT CURRENT. 0.3%/V TYPICAL LOAD REGULATION. 0.01%/V TYPICAL LINE REGULATION. CURRENT LIMIT CONSTANT WITH TEM-
PERATURE. RIPPLE REJECTION : 77dB. STANDARD 3-LEAD TRANSISTOR PACK-
AGES. EXCELLENT THERMAL REGULATION:
0.002%/V. 50ppm/°C TEMPERATURE COEFFICIENT
DESCRIPTIONThe LM137 series are adjustable 3-terminal nega-
tive voltage regulators capable of supplying in ex-
cess - 1.5A over a - 1.2 to - 37V output voltage range.
They are exceptionally easy to use and require only
two external resistors to set the output voltage. Fur-
ther, both line and load regulation are better than
standard fixed regulators. Also, LM137 regulators
are supplied in standard transistor packages which
are easily mounted and handled. In addition to
higher performance than fixed regulators, the
LM137 series offer full overload protection available
only in integrated circuits. Included on the chip are
current limit, thermal overload protection and safe
area protection. All overload protection circuitry re-
mains fully functional even if the adjustment terminal
is disconnected.
PIN CONNECTIONS1/14
ABSOLUTE MAXIMUM RATING
THERMAL CHARACTERISTICS
ORDER CODES
LM137-LM237-LM3372/14
SCHEMATIC DIAGRAM
LM137-LM237-LM3373/14
ELECTRICAL CHARACTERISICS
LM137: -55 o C < Tj < 150 oC
LM237: -25 o C < Tj < 150 oC
LM337: 0 o C < Tj < 150 oC
VI - VO = 5V, IO = 0.5 A (unless otherwise specified)
Notes :1. Although power dissipation is internally limited, these specifications are applicable for power dissipation of : 2W for TO-39 15W for TO-220 20W for TO-3 Package
IO(max) is : 1.5A for TO-3 and TO-220 0.5A for TO-39 Regulation is measured at constant junction temperature, using pulse testing with a low duty cycle. Changes in out-
put voltage due to heating effects are covered under the specification for thermal regulation.
LM137-LM237-LM3374/14
LM137-LM237-LM3375/14
