LM4041 datasheet(8/19 Pages) NSC

8 / 19 page

Electrical Characteristics (continued)

Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is

functional, but do not guarantee specific performance limits. For guaranteed specifications and test conditions, see the Electrical Characteristics. The guaranteed

specifications apply only for the test conditions listed. Some performance characteristics may degrade when the device is not operated under the listed test

conditions.

Note 2: The maximum power dissipation must be derated at elevated temperatures and is dictated by TJmax (maximum junction temperature), θJA (junction to

ambient thermal resistance), and TA (ambient temperature). The maximum allowable power dissipation at any temperature is PDmax =(TJmax −TA)/θJA or the

number given in the Absolute Maximum Ratings, whichever is lower. For the LM4041, TJmax = 125˚C, and the typical thermal resistance (θJA), when board mounted,

is 326˚C/W for the SOT-23 package, 415˚C/W for the SC70 package and 180˚C/W with 0.4" lead length and 170˚C/W with 0.125" lead length for the TO-92 package.

Note 3: The human body model is a 100 pF capacitor discharged through a 1.5 k

Ω resistor into each pin. The machine model is a 200 pF capacitor discharged

directly into each pin. All pins are rated at 2kV for Human Body Model, but the feedback pin which is rated at 1kV.

Note 4: Typicals are at TJ = 25˚C and represent most likely parametric norm.

Note 5: Limits are 100% production tested at 25˚C. Limits over temperature are guaranteed through correlation using Statistical Quality Control (SQC) methods.

The limits are used to calculate National’s AOQL.

Note 6: The boldface (over-temperature) limit for Reverse Breakdown Voltage Tolerance is defined as the room temperature Reverse Breakdown Voltage Tolerance

±[(

∆VRv∆T)(max ∆T)(VR)]. Where, ∆VR/∆T is the VR temperature coefficient, max∆T is the maximum difference in temperature from the reference point of 25 ˚C

to T MAX or TMIN, and VR is the reverse breakdown voltage. The total over-temperature tolerance for the different grades in the industrial temperature range where

max

∆T=65˚C is shown below:

A-grade: ±0.75% = ±0.1% ±100 ppm/˚C x 65˚C

B-grade: ±0.85% = ±0.2% ±100 ppm/˚C x 65˚C

C-grade: ±1.15% = ±0.5% ±100 ppm/˚C x 65˚C

D-grade: ±1.98% = ±1.0% ±150 ppm/˚C x 65˚C

E-grade: ±2.98% = ±2.0% ±150 ppm/˚C x 65˚C

The total over-temperature tolerance for the different grades in the extended temperature range where max

∆T = 100 ˚C is shown below:

B-grade: ±1.2% = ±0.2% ±100 ppm/˚C x 100˚C

C-grade: ±1.5% = ±0.5% ±100 ppm/˚C x 100˚C

D-grade: ±2.5% = ±1.0% ±150 ppm/˚C x 100˚C

E-grade: ±4.5% = ±2.0% ±150 ppm/˚C x 100˚C

Therefore, as an example, the A-grade LM4041-1.2 has an over-temperature Reverse Breakdown Voltage tolerance of ±1.2V x 0.75% = ±9.2 mV.

Note 7: When VOUT ≤ 1.6V, the LM4041-ADJ in the SOT-23 package must operate at reduced IR. This is caused by the series resistance of the die attach between

the die (-) output and the package (-) output pin. See the Output Saturation (SOT-23 only) curve in the Typical Performance Characteristics section.

Note 8: Reference voltage and temperature coefficient will change with output voltage. See Typical Performance Characteristics curves.

Typical Performance Characteristics

Temperature Drift for Different

Average Temperature Coefficient

DS011392-19

Output Impedance vs Frequency

DS011392-4

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