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 • 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.

Also Recommended LM2937▲ Different Output Voltages LP2989▲ Better Performance, Lower Dropout LM2937-3.3▲ 3.3V Output Voltage MY BRIEFCASE                                       Click any "Briefcase" icon to add an item

Typical Application click for larger image	Connection Diagram click for larger image
Typical Performance *click for larger image Output Voltage vs Temperature, LM2937-2.5

Datasheet

Title		Size	Date	Other Language
	LM2937-2.5, LM2937-3.3 400mA and 500mA Voltage Regulators	735 Kbytes	29-Aug-05

Featured Application Notes

Title		Size	Date	Other Language
	AN-1836: Application Note 1836 LMH1251 Evaluation Board Users Guide v2.0	2267 Kbytes	24-Jun-08

More Application Notes

Title		Size	Date	Other Language
	AN-1836: Application Note 1836 LMH1251 Evaluation Board Users Guide v2.0	2267 Kbytes	24-Jun-08

Reliability Metrics

Part Number	Process	EFR Reject	EFR Sample Size	PPM	LTA Rejects	LTA Device Hours	FITS	MTTF (Hours)
LM2937ES-2.5	SLM	0	44046	0	0	3532500	1	1002356520
LM2937ESX-2.5	SLM	0	44046	0	0	3532500	1	1002356520
LM2937ET-2.5	SLM	0	44046	0	0	3532500	1	1002356520
LM2937IMP-2.5	SLM	0	44046	0	0	3532500	1	1002356520
LM2937IMPX-2.5	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.