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 5-V logic supply, or
higher input supply voltage, to the lower 2.5-V and 3.3-V supplies to power very-large-scale
integrations (VLSI) ASICs 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 5 V.
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 Ω. This allows the use of low ESR chip
The regulators are also suited for automotive applications, with built in protection from
reverse battery connections, two-battery jumps and up to +60 V/−50 V load dump transients. Familiar
regulator features such as short circuit and thermal shutdown protection are also built in.
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