LM50, LM50-Q1

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SNIS118E – JULY 1999 – REVISED SEPTEMBER 2013

ELECTRICAL CHARACTERISTICS (continued)

Parameter

Conditions

LM50B

LM50C/LM50-Q1

Units

(Limit)

Typical

Typical

+4.5V

130

130

μA (max)

180

180

μA (max)

Change of Quiescent Current

+4.5V

2.0

2.0

μA (max)

Temperature Coefficient of Quiescent

+1.0

+2.0

μA/°C

Current

±0.08

±0.08

°C

hours

(5)

Quiescent current is defined in the circuit of Figure 2.

(6)

For best long-term stability, any precision circuit will give best results if the unit is aged at a warm temperature, and/or temperature

cycled for at least 46 hours before long-term life test begins. This is especially true when a small (Surface-Mount) part is wave-soldered;

allow time for stress relaxation to occur. The majority of the drift will occur in the first 1000 hours at elevated temperatures. The drift after

1000 hours will not continue at the first 1000 hour rate.

TYPICAL CHARACTERISTICS

To generate these curves the LM50/LM50-Q1 was mounted to a printed circuit board as shown in Figure 14.

Thermal Resistance

Junction to Air

Thermal Time Constant

Figure 3.

Figure 4.

Thermal Response in Still Air

Thermal Response in Stirred Oil Bath

with Heat Sink (Figure 14)

with Heat Sink

Figure 5.

Figure 6.

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