| Overview
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| Diagrams
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| Parametrics
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| Documents
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| Order
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| Packaging
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| Reliability
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Features
| | Fully specified for operation over -40°C to +125°C |
| | Output current in excess of 500 mA (400mA for SOT-223 package) |
| | Output trimmed for 5% tolerance under all operating conditions |
| | Wide output capacitor ESR range, 0.01 up to 5
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| | Internal short circuit and thermal overload protection |
| | Reverse battery protection |
| | 60V input transient protection |
| | Mirror image insertion protection |
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.
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| Paramaters / Values | LM2937-3.3 | LM2937 | LP2989 | LM2937-2.5 |
| Output Current | 500, 400 mA
| 500 mA
| 500 mA
| 500, 400 mA
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| Output Min | 3.3 Volt
| 12, 15, 8, 10, 5 Volt
| 2.5, 3.3, 3, 2.8, 5 Volt
| 2.5 Volt
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| Input Min Voltage | 4.75 Volt
| | 5.31, 3.11, 3.61, 2.81 Volt
| 4.75 Volt
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| Input Max Voltage | 26 Volt
| 26 Volt
| 16 Volt
| 26 Volt
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| Adjustable Output | No
| No
| No
| No
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| Quiescent Current | 2 mA
| 2 mA
| 0.11 mA
| 2 mA
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| On/Off Pin | No
| No
| Yes
| No
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| Error Flag | No
| No
| Yes
| No
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| RegType | LDO
| LDO
| LDO
| LDO
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| Temperature Min | -40 deg C
| -40 deg C
| -40 deg C
| -40 deg C
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| Temperature Max | 125, 85 deg C
| 125 deg C
| 125 deg C
| 125, 85 deg C
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| Output Max | 3.3 Volt
| 12, 15, 8, 10, 5 Volt
| 2.5, 3.3, 3, 2.8, 5 Volt
| 2.5 Volt
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| Output Voltage | 3.3 Volt
| 12, 15, 8, 10, 5 Volt
| 2.5, 3.3, 3, 2.8, 5 Volt
| 2.5 Volt
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Datasheet
Featured Application Notes
More Application Notes
Part Number(s) (NSID) | Top View | Availability | Current Reported Stock | Budgetary Pricing | Standard Pack Size |
LM2937IMP-3.3/NOPB LM2937IMP-3.3
RoHS | | Full production Lead Time: 6 weeks
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| $0.69 each at 1K+ pcs | reel of 1000 |
LM2937IMPX-3.3/NOPB LM2937IMPX-3.3
RoHS | | Full production Lead Time: 12 weeks
| | Distributor | Region | Qty |
| ARROW |  | Worldwide | 4000 |
| DIGIKEY |  | Worldwide | 2000 |
| $0.69 each at 1K+ pcs | reel of 2000 |
LM2937ET-3.3/NOPB LM2937ET-3.3
RoHS | | Full production Lead Time: 12 weeks
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| $0.74 each at 1K+ pcs | rail of 45 |
LM2937ES-3.3/NOPB LM2937ES-3.3
RoHS | | Full production Lead Time: 12 weeks
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| $0.88 each at 1K+ pcs | rail of 45 |
LM2937ESX-3.3/NOPB LM2937ESX-3.3
RoHS | | Full production Lead Time: 12 weeks
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| $0.88 each at 1K+ pcs | reel of 500 |
Reliability Metrics
| Part Number |
Process |
EFR Reject |
EFR Sample Size |
PPM |
LTA Rejects |
LTA Device Hours |
FITS |
MTTF (Hours) |
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LM2937ES-3.3 | SLM | 0 | 44046 | 0 | 0 | 3532500 | 1 | 1002356520
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LM2937ESX-3.3 | SLM | 0 | 44046 | 0 | 0 | 3532500 | 1 | 1002356520
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LM2937ET-3.3 | SLM | 0 | 44046 | 0 | 0 | 3532500 | 1 | 1002356520
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LM2937IMP-3.3 | SLM | 0 | 44046 | 0 | 0 | 3532500 | 1 | 1002356520
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LM2937IMPX-3.3 | SLM | 0 | 44046 | 0 | 0 | 3532500 | 1 | 1002356520
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Note: The Early Failure Rates (EFR) were calculated as point estimate PPM based on rejects and sample size for EFR.
The Long Term Failure Rates were calculated
at 60% confidence using the Arrhenius equation at 0.7eV activation energy and derating the assumed stress
temperature of 150°C to an application temperature of 55°C.
For more information on Reliability Metrics, please click here.
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