Datasheet

LM2940-N, LM2940C
SNVS769H –MAY 2004–REVISED MARCH 2007 www.ti.com
Electrical Characteristics
V
IN
= V
O
+ 5V, I
O
= 1A, C
O
= 22 μF, unless otherwise specified. Boldface limits apply over the entire operating
temperature range of the indicated device. All other specifications apply for T
A
= T
J
= 25°C.
Output Voltage (V
O
) 5V 8V
LM2940 LM2940/883 LM2940 LM2940/883
Units
Parameter Conditions Typ Limit Limit Typ Limit Limit
(1) (2) (1) (2)
6.25V ≤ V
IN
≤ 26V 9.4V ≤ V
IN
≤ 26V
Output Voltage 5 mA ≤ I
O
≤ 1A 5.00 4.85/4.75 4.85/4.75 8.00 7.76/7.60 7.76/7.60 V
MIN
5.15/5.25 5.15/5.25 8.24/8.40 8.24/8.40 V
MAX
Line Regulation V
O
+ 2V ≤ V
IN
≤ 26V, 20 50 40/50 20 80 50/80 mV
MAX
I
O
= 5 mA
Load Regulation 50 mA ≤ I
O
≤ 1A
LM2940, LM2940/883 35 50/80 50/100 55 80/130 80/130 mV
MAX
LM2940C 35 50 55 80
Output 100 mADC and
Impedance 20 mArms, 35 1000/1000 55 1000/1000 mΩ
f
O
= 120 Hz
Quiescent V
O
+2V ≤ V
IN
≤ 26V,
Current I
O
= 5 mA
LM2940, LM2940/883 10 15/20 15/20 10 15/20 15/20 mA
MAX
LM2940C 10 15
V
IN
= V
O
+ 5V, 30 45/60 50/60 30 45/60 50/60 mA
MAX
I
O
= 1A
Output Noise 10 Hz − 100 kHz, 150 700/700 240 1000/1000 μV
rms
Voltage I
O
= 5 mA
Ripple Rejection f
O
= 120 Hz, 1 V
rms
,
I
O
= 100 mA
LM2940 72 60/54 66 54/48 dB
MIN
LM2940C 72 60 66 54
f
O
= 1 kHz, 1 V
rms
, 60/50 54/48 dB
MIN
I
O
= 5 mA
Long Term 20 32 mV/
Stability 1000 Hr
Dropout Voltage I
O
= 1A 0.5 0.8/1.0 0.7/1.0 0.5 0.8/1.0 0.7/1.0 V
MAX
I
O
= 100 mA 110 150/200 150/200 110 150/200 150/200 mV
MAX
Short Circuit
(3)
1.9 1.6 1.5/1.3 1.9 1.6 1.6/1.3 A
MIN
Current
Maximum Line R
O
= 100Ω
Transient LM2940, T ≤ 100 ms 75 60/60 75 60/60
V
MIN
LM2940/883, T ≤ 20 ms 40/40 40/40
LM2940C, T ≤ 1 ms 55 45 55 45
Reverse Polarity R
O
= 100Ω
DC Input Voltage LM2940, LM2940/883 −30 −15/−15 −15/−15 −30 −15/−15 −15/−15 V
MIN
LM2940C −30 −15 −30 −15
(1) All limits are guaranteed at T
A
= T
J
= 25°C only (standard typeface) or over the entire operating temperature range of the indicated
device (boldface type). All limits at T
A
= T
J
= 25°C are 100% production tested. All limits at temperature extremes are guaranteed via
correlation using standard Statistical Quality Control methods.
(2) All limits are guaranteed at T
A
= T
J
= 25°C only (standard typeface) or over the entire operating temperature range of the indicated
device (boldface type). All limits are 100% production tested and are used to calculate Outgoing Quality Levels.
(3) Output current will decrease with increasing temperature but will not drop below 1A at the maximum specified temperature.
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