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Details, datasheet, quote on part number:LM2937ESX-3.3
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| Part: | LM2937ESX-3.3 |
| Category: | Power Management => Regulators => Linear Voltage Regulators => LDO (Low Drop Out) => Positive Voltage->Fixed |
| Description: | LM2937-3.3 - 400mA And 500mA Voltage Regulator, Package: TO263, Pin Nb=3 |
| Company: | National Semiconductor Corporation |
| Datasheet: | Download LM2937ESX-3.3 datasheet File size : 301 kB |
| Request For quote: | Find where to buy LM2937ESX-3.3
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Datasheet text preview:
LM2937-2.5, LM2937-3.3 400mA and 500mA Voltage Regulators
February 1998
LM2937-2.5, LM2937-3.3 400mA and 500mA Voltage Regulators
General Description
The LM2937-2.5 and LM2937-3.3 are positive voltage regulators capable of supplying up to 500 mA of load current. Both regulators are ideal for converting a common 5V logic supply, or higher input supply voltage, to the lower 2.5V and 3.3V supplies to power VLSI ASIC's and microcontrollers. 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 5V. The LM2937 requires an output bypass capacitor for stability. As with most regulators utilizing a PNP pass transistor, the ESR of this capacitor remains a critical design parameter, but the LM2937-2.5 and LM2937-3.3 include special compensation circuitry that relaxes ESR requirements. The LM2937 is stable for all ESR ratings less than 5. This allows the use of low ESR chip capacitors. The regulators are also suited for automotive applications, with built in protection 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 (400mA for SOT-223 package) n Output trimmed for 5% tolerance under all operating conditions n Wide output capacitor ESR range, 0.01 up to 5 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
DS100113-24
Front View Order Number LM2937ET-2.5, LM2937ET-3.3, See NS Package Number T03B
DS100113-25
Front View Order Number LM2937IMP-2.5, LM2937IMP-3.3, See NS Package Number MA04A
TO-263 Surface-Mount Package
DS100113-27
Side View
DS100113-26
Top View Order Number LM2937ES-2.5, LM2937ES-3.3, See NS Package Number TS3B
© 1998 National Semiconductor Corporation
DS100113
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Connection Diagram and Ordering Information
Temperature Range -40°C TA 125°C -40°C TA 85°C SOT-223 Package Markings Output Voltage 2.5 LM2937ES-2.5 LM2937ET-2.5 LM2937IMP-2.5 L68B 3.3
(Continued) NSC Package Drawing TS3B T03B MA04A TO-263 TO-220 SOT-223 Package
LM2937ES-3.3 LM2937ET-3.3 LM2937IMP-3.3 L69B
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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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 Lead Temperature Soldering 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 (Infrared, 15 seconds) ESD Susceptibility (Note 3)
230°C 215°C 220°C 2 kV
Operating Conditions(Note 1)
Temperature Range (Note 2) LM2937ES, LM2937ET LM2937IMP Input Voltage Range -40°C TA 125°C -40°C TA 85°C 4.75V to 26V
Electrical Characteristics(Note 4)
VIN = VNOM + 5V, 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 2.5 Typ 2.5V Limit 2.42 2.38 2.56 2.62 Line Regulation(Note 5) Load Regulation Quiescent Current 4.75V VIN 26V, IOUT = 5 mA 5 mA IOUT IOUTmax 7V VIN 26V, IOUT = 5 mA VIN = (VOUT + 5V), IOUT = IOUTmax VIN = 5V, IOUT = IOUTmax Output Noise Voltage Long Term Stability Short-Circuit Current Peak Line Transient Voltage Maximum Operational Input Voltage Reverse DC Input Voltage Reverse Transient Input Voltage
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 - TA)/JA, where 125 is the maximum junction temperature for operation, TA is the ambient temperature, and JA is the junction-to-ambient thermal resistance. If this dissipation is exceeded, the die temperature will rise above 125°C and the electrical specifications do not apply. If the die temperature rises above 150°C, the regulator will go into thermal shutdown. The junction-to-ambient thermal resistance JA is 65°C/W, for the TO-220 package, 73°C/W for the TO-263 package, and 174°C/W for the SOT-223 package. When used with a heatsink, JA is the sum of the device junction-to-case thermal resistance JC of 3°C/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 k. Note 4: Typicals are at TJ = 25°C and represent the most likely parametric norm. Note 5: The minimum input voltage required for proper biasing of these regulators is 4.75V. Below this level the outputs will fall out of regulation. This effect is not the normal dropout characteristic where the output falls out of regulation due to the PNP pass transistor entering saturation. If a value for worst case effective input to output dropout voltage is required in a specification, the values should be 2.37V maximum for the LM2937-2.5 and 1.6V maximum for the LM2937-3.3.
3.3V Typ 3.3 Limit 3.20 3.14 3.40 3.46 9.9 3.3 2 10 66 99 13.2 0.6 60 26 1.0 75 0.6 60 26 -30 -75 -15 -50 33 33 10 20 100125
Units V (Min) V(Min) V(Max) V(Max) mV(Max) mV(Max) mA(Max) mA(Max) mA(Max) µVrms mV A(Min) V(Min) V(Min) V(Min) V(Min)
7.5 2.5 2 10 66 75 10 1.0 75
25 25 10 20 100125
10 Hz 100 kHz, IOUT = 5 mA 1000 Hrs. tf < 100 ms, RL = 100
VOUT -0.6V, RL = 100 tr < 1 ms, RL = 100
-30 -75
-15 -50
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