LM2937-3.3 Datasheet | National Semiconductor

Description The LM2937-2.5 and LM2937-3.3 are positive voltage regulators capable of supplying up to 500 m A of load current. Both regulators are ideal for converting a mon 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 m A with a full 500 m A 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 pensation circuitry that relaxes ESR requirements. The LM2937 is stable for all ESR ratings less than 5Ω. 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 m A (400m A for SOT-223 package) n Output trimmed for 5% tolerance under all operating conditions n Wide output capacitor ESR range, 0.01Ω up to 5Ω 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...