LM337T/NOPB National Semiconductor, LM337T/NOPB Datasheet - Page 3

• Manufacturer Part Number: LM337T/NOPB
• Description: IC REGULATOR NEG ADJ TO220-3
• Manufacturer: National Semiconductor
• Type: Voltage Regulatorr

Specifications of LM337T/NOPB

• Regulator Topology: Negative Adjustable
• Voltage - Output: -1.2 ~ -37 V
• Voltage - Input: -4.2 ~ -50 V
• Number Of Regulators: 1
• Current - Output: 1.5A
• Current - Limit (min): 1.5A
• Operating Temperature: 0°C ~ 125°C
• Mounting Type: Through Hole
• Package / Case: TO-220-3 (Straight Leads)
• Current, Output: 1.5 A
• Package Type: TO-220
• Power Dissipation: 15 W
• Regulation, Line: 0.01 %/V
• Regulation, Load: 0.3 %
• Regulator Type: Negative Voltage Out
• Resistance, Thermal, Junction To Case: 4 °C/W
• Temperature, Operating, Range: 0 to +125 °C
• Voltage, Input: 40 V
• Voltage, Noise: 0.003 %
• Voltage, Output: -1.2 to -37 V
• Voltage, Supply, Rejection Ratio: 77 dB
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Voltage - Dropout (typical): -
• Lead Free Status / Rohs Status: RoHS Compliant part Electrostatic Device
• Other names: *LM337T; *LM337T/NOPB; LM337TNS

Electrical Characteristics
Note 4: Refer to RETS137H drawing for LM137H or RETS137K drawing for LM137K military specifications.
Schematic Diagram
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 es-
pecially 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 coeffi-
cient, 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
V
applied. The LM137’s specification is 0.02%/W, max.
OUT
, per Watt, within the first 10 ms after a step of power is
(Note 1) (Continued)
3
LM137, V
V
I
Vertical sensitivity, 5 mV/div
IL
IN
= 0A → 0.25A → 0A
− V
OUT
OUT
= −40V
= −10V
FIGURE 1.
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