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
) 9V 10V
LM2940 LM2940
Units
Parameter Conditions Typ Limit Typ Limit
(1) (1)
10.5V ≤ V
IN
≤ 26V 11.5V ≤ V
IN
≤ 26V
Output Voltage 5 mA ≤ I
O
≤1A 9.00 8.73/8.55 10.00 9.70/9.50 V
MIN
9.27/9.45 10.30/10.50 V
MAX
Line Regulation V
O
+ 2V ≤ V
IN
≤ 26V, 20 90 20 100 mV
MAX
I
O
= 5 mA
Load Regulation 50 mA ≤ I
O
≤ 1A
LM2940 60 90/150 65 100/165 mV
MAX
LM2940C 60 90
Output Impedance 100 mADC and
20 mArms, 60 65 mΩ
f
O
= 120 Hz
Quiescent V
O
+2V ≤ V
IN
< 26V,
Current I
O
= 5 mA
LM2940 10 15/20 10 15/20 mA
MAX
LM2940C 10 15
V
IN
= V
O
+ 5V, I
O
= 1A 30 45/60 30 45/60 mA
MAX
Output Noise 10 Hz − 100 kHz, 270 300 μV
rms
Voltage I
O
= 5 mA
Ripple Rejection f
O
= 120 Hz, 1 V
rms
,
I
O
= 100 mA
LM2940 64 52/46 63 51/45 dB
MIN
LM2940C 64 52
Long Term 34 36 mV/
Stability
1000 Hr
Dropout Voltage I
O
= 1A 0.5 0.8/1.0 0.5 0.8/1.0 V
MAX
I
O
= 100 mA 110 150/200 110 150/200 mV
MAX
Short Circuit
(2)
1.9 1.6 1.9 1.6 A
MIN
Current
Maximum Line R
O
= 100Ω
Transient T ≤ 100 ms
LM2940 75 60/60 75 60/60 V
MIN
LM2940C 55 45
Reverse Polarity R
O
= 100Ω
DC Input Voltage LM2940 −30 −15/−15 −30 −15/−15 V
MIN
LM2940C −30 −15
Reverse Polarity R
O
= 100Ω
Transient Input T ≤ 100 ms
Voltage LM2940 −75 −50/−50 −75 −50/−50 V
MIN
LM2940C −55 −45/−45
(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) Output current will decrease with increasing temperature but will not drop below 1A at the maximum specified temperature.
6 Submit Documentation Feedback Copyright © 2004–2007, Texas Instruments Incorporated
Product Folder Links: LM2940-N LM2940C