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Details, datasheet, quote on part number:LM2937ET-12
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| Part: | LM2937ET-12 |
| Category: | Power Management => Regulators => Linear Voltage Regulators => LDO (Low Drop Out) => Positive Voltage->Fixed |
| Description: | LM2937 - 500 ma Low Dropout Regulator, Package: TO263, Pin Nb=3 |
| Company: | National Semiconductor Corporation |
| Datasheet: | Download LM2937ET-12 datasheet File size : 316 kB |
| Request For quote: | Find where to buy LM2937ET-12
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Datasheet text preview:
LM2937 500 mA Low Dropout Regulator
July 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 3. 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 connections, 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
n Fully specified for operation over -40°C to +125°C n Output current in excess of 500 mA n Output trimmed for 5% tolerance under all operating conditions n Typical dropout voltage of 0.5V at full rated load current n Wide output capacitor ESR range, up to 3 n Internal short circuit and thermal overload protection n Reverse battery protection n 60V input transient protection n Mirror image insertion protection
Connection Diagram and Ordering Information
TO-220 Plastic Package SOT-223 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
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
© 2000 National Semiconductor Corporation
DS011280
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LM2937
Connection Diagram and Ordering Information
Temperature Range -40°C TJ 125°C -40°C TJ 85°C Output Voltage 5.0 LM2937ES-5.0 LM2937ET-5.0 LM2937IMP-5.0 8.0 LM2937ES-8.0 LM2937ET-8.0 LM2937IMP-8.0 10 LM2937ES-10 LM2937ET-10 LM2937IMP-10 LM2937IMPX-10
(Continued)
NSC 12 15 LM2937ES-15 LM2937ET-15 LM2937IMP-15 LM2937IMPX-15 Package Drawing TS3B T03B MP04A MP04A TO-263 TO-220 SOT-223 SOT-223 in Tape and Reel Package
LM2937ES-12 LM2937ET-12 LM2937IMP-12 LM2937IMPX-12
LM2937IMPX-5.0 LM2937IMPX-8.0
SOT-223 Package Markings
L71B
L72B
L73B
L74B
L75B
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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LM2937
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 Continuous Transient (t 100 ms) Internal Power Dissipation (Note 2) Maximum Junction Temperature Storage Temperature Range TO-220 (10 seconds) 26V 60V Internally Limited 150°C -65°C to +150°C 260°C
TO-263 (10 seconds) SOT-223 (Vapor Phase, 60 seconds) SOT-223 (Infared, 15 seconds) ESD Susceptibility (Note 3)
230°C 215°C 220°C 2 kV
Operating Conditions (Note 1)
Temperature Range (Note 2) LM2937ET, LM2937ES LM2937IMP Maximum Input Voltage -40°C TJ 125°C -40°C TJ 85°C 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 = 25°C. Output Voltage (VOUT) Parameter Output Voltage Conditions 5 mA IOUT IOUTmax 5.00 Typ 5V Limit 4.85 4.75 5.15 5.25 Line Regulation Load Regulation Quiescent Current (VOUT + 2V) VIN 26V, IOUT = 5 mA 5 mA IOUT IOUTmax (VOUT + 2V) VIN 26V, IOUT = 5 mA VIN = (VOUT + 5V), IOUT = IOUTmax Output Noise Voltage Long Term Stability Dropout Voltage Short-Circuit Current Peak Line Transient Voltage Maximum Operational Input Voltage Reverse DC Input Voltage Reverse Transient Input Voltage tr < 1 ms, RL = 100 -75 -50 -75 -50 -75 -50 V(Min) VOUT -0.6V, RL = 100 -30 -15 -30 -15 -30 -15 V(Min) 26 26 26 V(Min) tf < 100 ms, RL = 100 10 Hz 100 kHz IOUT = 5 mA 1000 Hrs. IOUT = IOUTmax IOUT = 50 mA 20 0.5 110 1.0 75 1.0 250 0.6 60 32 0.5 110 1.0 75 1.0 250 0.6 60 40 0.5 110 1.0 75 1.0 250 0.6 60 mV V(Max) mV(Max) A(Min) V(Min) 150 240 300 µVrms 10 20 10 20 10 20 mA(Max) 5 2 50 10 8 2 80 10 10 2 100 10 mV(Max) mA(Max) 15 50 24 8.00 Typ 8V Limit 7.76 7.60 8.24 8.40 80 30 10.00 Typ 10V Limit 9.70 9.50 10.30 10.50 100 V(Min) V(Min) V(Max) V(Max) mV(Max) Units
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