LM337T National Semiconductor, LM337T Datasheet - Page 4

• Manufacturer Part Number: LM337T
• Description: IC, NEGATIVE ADJ REG, -1.2V TO 7V TO-220
• Manufacturer: National Semiconductor

Specifications of LM337T

• Primary Input Voltage: 40V
• Output Voltage Adjustable Range: -1.2V To -37V
• Dropout Voltage Vdo: 1.9V
• No. Of Outputs: 1
• No. Of Pins: 3
• Output Current: 1.5A
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

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Thermal Regulation
In Figure 1, a typical LM137’s output drifts only 3 mV (or
0.03% of V
10 ms. This performance is thus well inside the specification
limit of 0.02%/W x 10W = 0.2% max. When the 10W pulse is
LM137, V
V
I
Horizontal sensitivity, 20 ms/div
Connection Diagrams
Case is Input
L
IN
= 0A → 0.25A → 0A
− V
OUT
OUT
LM137KPQML and LM137KPQMLV(Note 5)
= −40V
= −10V
OUT
See NS Package Number K02C
See NS Package Number K02A
Order Number LM337K STEEL
Order Number LM137K/883
= −10V) when a 10W pulse is applied for
Metal Can Package
Bottom View
TO-3
(Continued)
00906705
FIGURE 2.
4
Case Is Input
Note 5: See STD Mil DWG 5962P99517 for Radiation Tolerant Devices
ended, the thermal regulation again shows a 3 mV step at
the LM137 chip cools off. Note that the load regulation error
of about 8 mV (0.08%) is additional to the thermal regulation
error. In Figure 2, when the 10W pulse is applied for 100 ms,
the output drifts only slightly beyond the drift in the first
10 ms, and the thermal error stays well within 0.1% (10 mV).
Order Number LM137H, LM137H/883 or LM337H
LM137HPQML and LM137HPQMLV(Note 5)
See NS Package Number H03A
00906704
Metal Can Package
Bottom View
TO-39
00906706