Datasheet
Package Availability, Models, Samples & Pricing
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.
Reliability Metrics
| Part Number |
Process |
EFR Reject |
EFR Sample Size |
PPM |
LTA Rejects |
LTA Device Hours |
FITS |
MTTF (Hours) |
|
LM2937ES-3.3 | SLM | 0 | 44046 | 0 | 0 | 3532500 | 1 | 1002356520
|
|
LM2937ESX-3.3 | SLM | 0 | 44046 | 0 | 0 | 3532500 | 1 | 1002356520
|
|
LM2937ET-3.3 | SLM | 0 | 44046 | 0 | 0 | 3532500 | 1 | 1002356520
|
|
LM2937IMP-3.3 | SLM | 0 | 44046 | 0 | 0 | 3532500 | 1 | 1002356520
|
|
LM2937IMPX-3.3 | SLM | 0 | 44046 | 0 | 0 | 3532500 | 1 | 1002356520
|
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.
[Information as of 7-Nov-2009]
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