NSC LM2937IMP-5.0, LM2937IMP-15, LM2937IMP-12, LM2937IMP-10, LM2937ET-8.0 Datasheet
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March 2000
LM2937
500 mA Low Dropout Regulator
General Description
The LM2937 is a positive voltage regulator capable of supplying up to 500 mA of load current. The use of a PNP power transistor provides a low dropout voltage characteristic. With a load current of 500 mA the minimum input to output voltage differential required for the output to remain in regulation is typically 0.5V (1V guaranteed maximum over the full operating temperature range). Special circuitry has been incorporated to minimize the quiescent current to typically only 10 mA with a full 500 mA load current when the input to output voltage differential is greater than 3V.
The LM2937 requires an output bypass capacitor for stability. As with most low dropout regulators, the ESR of this capacitor remains a critical design parameter, but the LM2937 includes special compensation circuitry that relaxes ESR requirements. The LM2937 is stable for all ESR below 3Ω. This allows the use of low ESR chip capacitors.
Ideally suited for automotive applications, the LM2937 will protect itself and any load circuitry from reverse battery con-
nections, two-battery jumps and up to +60V/−50V load dump transients. Familiar regulator features such as short circuit and thermal shutdown protection are also built in.
Features
nFully specified for operation over −40ÊC to +125ÊC
nOutput current in excess of 500 mA
nOutput trimmed for 5% tolerance under all operating conditions
nTypical dropout voltage of 0.5V at full rated load current
nWide output capacitor ESR range, up to 3Ω
nInternal short circuit and thermal overload protection
nReverse battery protection
n60V input transient protection
nMirror image insertion protection
Connection Diagram and Ordering Information
TO-220 Plastic Package
DS011280-2
Front View
Order Number LM2937ET-5.0, LM2937ET-8.0, LM2937ET-10, LM2937ET-12 or LM2937ET-15 See NS Package Number T03B
SOT-223 Plastic Package
DS011280-26
Front View
Order Number LM2937IMP-5.0, LM2937IMP-8.0, LM2937IMP-10, LM2937IMP-12 or LM2937IMP-15 See NS Package Number MP04A
TO-263 Surface-Mount Package
DS011280-6
Side View
DS011280-5
Top View
Order Number LM2937ES-5.0, LM2937ES-8.0,
LM2937ES-10, LM2937ES-12 or LM2937ES-15
See NS Package Number TS3B
Regulator Dropout Low mA 500 LM2937
© 2000 National Semiconductor Corporation |
DS011280 |
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LM2937
Connection Diagram and Ordering Information (Continued)
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Temperature |
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Output Voltage |
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NSC |
Package |
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Range |
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5.0 |
8.0 |
10 |
12 |
15 |
Package |
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Drawing |
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−40ÊC |
≤ TJ ≤ 125ÊC |
LM2937ES-5.0 |
LM2937ES-8.0 |
LM2937ES-10 |
LM2937ES-12 |
LM2937ES-15 |
TS3B |
TO-263 |
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LM2937ET-5.0 |
LM2937ET-8.0 |
LM2937ET-10 |
LM2937ET-12 |
LM2937ET-15 |
T03B |
TO-220 |
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−40ÊC |
≤ TJ ≤ 85ÊC |
LM2937IMP-5.0 |
LM2937IMP-8.0 |
LM2937IMP-10 |
LM2937IMP-12 |
LM2937IMP-15 |
MP04A |
SOT-223 |
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LM2937IMPX-5.0 |
LM2937IMPX-8.0 |
LM2937IMPX-10 |
LM2937IMPX-12 |
LM2937IMPX-15 |
MP04A |
SOT-223 |
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in Tape |
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and Reel |
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SOT-223 Package |
L71B |
L72B |
L73B |
L74B |
L75B |
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Markings |
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The small physical size of the SOT-223 package does not allow sufficient space to provide the complete device part number. The actual devices will be labeled with the package markings shown.
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2 |
Absolute Maximum Ratings (Note 1)
If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications.
Input Voltage |
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Continuous |
26V |
Transient (t £ 100 ms) |
60V |
Internal Power Dissipation (Note 2) |
Internally Limited |
Maximum Junction Temperature |
150ÊC |
Storage Temperature Range |
−65ÊC to +150ÊC |
TO-220 (10 seconds) |
260ÊC |
TO-263 (10 seconds) |
230ÊC |
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SOT-223 |
(Vapor Phase, 60 seconds) |
215ÊC |
SOT-223 |
(Infared, 15 seconds) |
220ÊC |
ESD Susceptibility (Note 3) |
2 kV |
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Operating Conditions (Note 1)
Temperature Range (Note 2) |
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LM2937ET, LM2937ES |
−40ÊC |
£ TJ £125ÊC |
LM2937IMP |
−40ÊC |
£ TJ £85ÊC |
Maximum Input Voltage |
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26V |
Electrical Characteristics
VIN = VNOM + 5V, (Note 4) IOUTmax = 500 mA for the TO-220 and TO-263 packages, IOUTmax=400mA for the SOT-223 package, COUT = 10 µF unless otherwise indicated. Boldface limits apply over the entire operating temperature range of the
indicated device., all other specifications are for TA = TJ = 25ÊC.
Output Voltage (VOUT) |
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5V |
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8V |
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10V |
Units |
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Parameter |
Conditions |
Typ |
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Limit |
Typ |
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Limit |
Typ |
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Limit |
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Output Voltage |
5 mA £ IOUT £ IOUTmax |
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4.85 |
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7.76 |
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9.70 |
V(Min) |
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5.00 |
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4.75 |
8.00 |
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7.60 |
10.00 |
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9.50 |
V(Min) |
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5.15 |
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8.24 |
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10.30 |
V(Max) |
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5.25 |
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8.40 |
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10.50 |
V(Max) |
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Line Regulation |
(VOUT + 2V) £ VIN £ 26V, |
15 |
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50 |
24 |
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80 |
30 |
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100 |
mV(Max) |
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IOUT = 5 mA |
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Load Regulation |
5 mA £ IOUT £ IOUTmax |
5 |
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50 |
8 |
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80 |
10 |
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100 |
mV(Max) |
Quiescent Current |
(VOUT + 2V) £ VIN £ 26V, |
2 |
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10 |
2 |
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10 |
2 |
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10 |
mA(Max) |
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IOUT = 5 mA |
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VIN = (VOUT + 5V), |
10 |
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20 |
10 |
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20 |
10 |
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20 |
mA(Max) |
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IOUT = IOUTmax |
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Output Noise |
10 Hz±100 kHz |
150 |
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240 |
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300 |
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µVrms |
Voltage |
IOUT = 5 mA |
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Long Term Stability |
1000 Hrs. |
20 |
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32 |
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40 |
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mV |
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Dropout Voltage |
IOUT = IOUTmax |
0.5 |
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1.0 |
0.5 |
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1.0 |
0.5 |
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1.0 |
V(Max) |
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IOUT = 50 mA |
110 |
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250 |
110 |
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250 |
110 |
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250 |
mV(Max) |
Short-Circuit Current |
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1.0 |
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0.6 |
1.0 |
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0.6 |
1.0 |
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0.6 |
A(Min) |
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Peak Line Transient |
tf < 100 ms, RL = 100W |
75 |
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60 |
75 |
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60 |
75 |
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60 |
V(Min) |
Voltage |
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Maximum Operational |
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26 |
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26 |
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26 |
V(Min) |
Input Voltage |
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Reverse DC |
VOUT ³ −0.6V, R L = 100W |
−30 |
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−15 |
−30 |
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−15 |
−30 |
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−15 |
V(Min) |
Input Voltage |
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Reverse Transient |
tr < 1 ms, RL = 100W |
−75 |
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−50 |
−75 |
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−50 |
−75 |
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−50 |
V(Min) |
Input Voltage |
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LM2937
3 |
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LM2937
Electrical Characteristics
VIN = VNOM + 5V, (Note 4) IOUTmax = 500 mA for the TO-220 and TO-263 packages, IOUTmax=400mA for the SOT-223 package, COUT = 10 µF unless otherwise indicated. Boldface limits apply over the entire operating temperature range of the
indicted device., all other specifications are for TA = TJ = 25ÊC.
Output Voltage (VOUT) |
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12V |
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15V |
Units |
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Parameter |
Conditions |
Typ |
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Limit |
Typ |
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Limit |
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Output Voltage |
5 mA £ IOUT £ IOUTmax |
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11.64 |
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14.55 |
V (Min) |
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12.00 |
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11.40 |
15.00 |
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14.25 |
V(Min) |
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12.36 |
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15.45 |
V(Max) |
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12.60 |
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15.75 |
V(Max) |
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Line Regulation |
(VOUT + 2V) £ VIN £ 26V, |
36 |
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120 |
45 |
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150 |
mV(Max) |
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IOUT = 5 mA |
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Load Regulation |
5 mA £ IOUT £ IOUTmax |
12 |
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120 |
15 |
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150 |
mV(Max) |
Quiescent Current |
(VOUT + 2V) £ VIN £ 26V, |
2 |
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10 |
2 |
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10 |
mA(Max) |
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IOUT = 5 mA |
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VIN = (VOUT + 5V), |
10 |
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20 |
10 |
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20 |
mA(Max) |
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IOUT = IOUTmax |
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Output Noise |
10 Hz±100 kHz, |
360 |
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450 |
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µVrms |
Voltage |
IOUT = 5 mA |
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Long Term Stability |
1000 Hrs. |
44 |
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56 |
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mV |
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Dropout Voltage |
IOUT = IOUTmax |
0.5 |
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1.0 |
0.5 |
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1.0 |
V(Max) |
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IOUT = 50 mA |
110 |
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250 |
110 |
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250 |
mV(Max) |
Short-Circuit Current |
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1.0 |
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0.6 |
1.0 |
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0.6 |
A(Min) |
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Peak Line Transient |
tf < 100 ms, RL = 100W |
75 |
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60 |
75 |
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60 |
V(Min) |
Voltage |
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Maximum Operational |
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26 |
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26 |
V(Min) |
Input Voltage |
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Reverse DC |
VOUT ³ −0.6V, R L = 100W |
−30 |
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−15 |
−30 |
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−15 |
V(Min) |
Input Voltage |
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Reverse Transient |
tr < 1 ms, RL = 100W |
−75 |
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−50 |
−75 |
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−50 |
V(Min) |
Input Voltage |
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Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Electrical specifications do not apply when operating the device outside of its rated Operating Conditions.
Note 2: The maximum allowable power dissipation at any ambient temperature is PMAX = (125 − T A)/θJA, where 125 is the maximum junction temperature for operation, TA is the ambient temperature, and θJA is the junction-to-ambient thermal resistance. If this dissipation is exceeded, the die temperature will rise above 125ÊC and the electrical specifications do not apply. If the die temperature rises above 150ÊC, the LM2937 will go into thermal shutdown. For the LM2937, the junction-to-ambient thermal resistance θJA is 65ÊC/W, for the TO-220 package, 73ÊC/W for the TO-263 package, and 174ÊC/W for the SOT-223 package. When used with a heatsink, θJA is the sum of the LM2937 junction-to-case thermal resistance θJC of 3ÊC/W and the heatsink case-to-ambient thermal resistance. If the TO-263 or SOT-223 packages are used, the thermal resistance can be reduced by increasing the P.C. board copper area thermally connected to the package (see Application Hints for more information on heatsinking).
Note 3: ESD rating is based on the human body model, 100 pF discharged through 1.5 kΩ.
Note 4: Typicals are at TJ = 25ÊC and represent the most likely parametric norm.
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