LM2941CS datasheet(3/10 Pages) NSC

3 / 10 page

Electrical Characteristics — LM2941CT, LM2941CS

≤ V

O ≤ 20V, VIN = VO + 5V, CO = 22 µF, unless otherwise specified. Specifications in standard typeface apply for TJ =

25˚C, while those in boldface type apply over the full Operating Temperature Range.

Parameter

Conditions

Typ

Limit

Units

(Note 5)

(Limits)

Reference Voltage

5 mA

≤ I

O ≤ 1A (Note 6)

1.275

1.237/1.211

V(min)

1.313/1.339

V(max)

Line Regulation

O +2V ≤ VIN ≤ 26V, IO = 5 mA

mV/V(max)

Load Regulation

50 mA

≤ I

O ≤ 1A

mV/V(max)

Output Impedance

100 mADC and 20 mArms

Ω/V

O = 120 Hz

Quiescent Current

O +2V ≤ VIN < 26V, IO = 5 mA

mA(max)

IN = VO + 5V, IO = 1A

45/60

mA(max)

RMS Output Noise,

10 Hz–100 kHz

0.003

% of V

OUT

O = 5mA

Ripple Rejection

O = 120 Hz, 1 Vrms, IL = 100 mA

0.005

0.02

%/V(max)

Long Term Stability

0.4

%/1000 Hr

Dropout Voltage

O = 1A

0.5

0.8/1.0

V(max)

O = 100 mA

110

200/200

mV(max)

Short Circuit Current

IN max = 26V (Note 7)

1.9

1.6

A(min)

Maximum Line

O max 1V above nominal VO

V(min)

Transient

O = 100Ω,T ≤ 100 ms

Maximum Operational Input

Voltage

Reverse Polarity DC Input

Voltage

O = 100Ω,VO ≥ −0.6V

−30

−15

V(min)

Reverse Polarity Transient

Input Voltage

≤ 100 ms, R

O = 100Ω

−55

−45

V(min)

ON/OFF Threshold Voltage

O ≤ 1A

1.30

0.80

V(max)

ON/OFF Threshold Voltage

OFF

O ≤ 1A

1.30

2.00

V(min)

ON/OFF Threshold Current

ON/OFF = 2.0V, IO ≤ 1A

100

µA(max)

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

tended to be functional, but device parameter specifications may not be guaranteed under these conditions. For guaranteed specifications and test conditions, see

the Electrical Characteristics.

Note 2: A military RETS specification available upon request. For more information about military-aerospace products, see the Mil-Aero web page at

http://www.national.com/appinfo/milaero/index.html.

Note 3: The maximum power dissipation is a function of TJ(max), θJA, and TA. The maximum allowable power dissipation at any ambient temperature is PD = (TJ-

(max) − TA)/θJA. If this dissipation is exceeded, the die temperature will rise above 150˚C and the LM2941 will go into thermal shutdown. For the LM2941T and

LM2941CT, the junction-to-ambient thermal resistance (

θJA) is 53˚C/W, and the junction-to-case thermal resistance (θJC) is 3˚C/W. For the LM2941K, θJA is 35˚C/W

and

θJC is 4˚C/W. The junction-to-ambient thermal resistance of the TO-263 is 73˚C/W, and junction-to-case thermal resistance, θJC is 3˚C. If the TO-263 package

is used, the thermal resistance can be reduced by increasing the P.C. board copper area thermally connected to the package: Using 0.5 square inches of copper area,

θJA is 50˚C/W; with 1 square inch of copper area, θJA is 37˚C/W; and with 1.6 or more square inches of copper area, θJA is 32˚C/W.

Note 4: All limits guaranteed at room temperature (standard typeface) and at temperature extremes (boldface type). All limits are used to calculate Outgoing Quality

Level, and are 100% production tested.

Note 5: All limits guaranteed at room temperature (standard typeface) and at temperature extremes (boldface type). All room temperature limits are 100% production

tested. All limits at temperature extremes are guaranteed via correlation using standard Statistical Quality Control (SQC) methods.

Note 6: The output voltage range is 5V to 20V and is determined by the two external resistors, R1 and R2. See Typical Application Circuit.

Note 7: Output current capability will decrease with increasing temperature, but will not go below 1A at the maximum specified temperatures.

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