LM2937-2.5, LM2937-3.3 400mA and 500mA Voltage Regulators August 2005 LM2937-2.5, LM2937-3.3 400mA and 500mA Voltage Regulators two-battery jumps and up to +60V/50V load dump tran- General Description sients. Familiar regulator features such as short circuit and The LM2937-2.5 and LM2937-3.3 are positive voltage regu- thermal shutdown protection are also built in. lators capable of supplying up to 500 mA of load current. Both regulators are ideal for converting a common 5V logic Features supply, or higher input supply voltage, to the lower 2.5V and n Fully specified for operation over 40C to +125C 3.3V supplies to power VLSI ASICs and microcontrollers. n Output current in excess of 500 mA (400mA for Special circuitry has been incorporated to minimize the qui- SOT-223 package) escent current to typically only 10 mA with a full 500 mA load current when the input to output voltage differential is greater n Output trimmed for 5% tolerance under all operating than 5V. conditions n Wide output capacitor ESR range, 0.01 up to 5 The LM2937 requires an output bypass capacitor for stabil- ity. As with most regulators utilizing a PNP pass transistor, n Internal short circuit and thermal overload protection the ESR of this capacitor remains a critical design param- n Reverse battery protection eter, but the LM2937-2.5 and LM2937-3.3 include special n 60V input transient protection compensation circuitry that relaxes ESR requirements. The n Mirror image insertion protection 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, Connection Diagrams and Ordering Information TO-220 Plastic Package SOT-223 Plastic Package 10011324 10011325 Front View Front View Order Number LM2937ET-2.5, LM2937ET-3.3, Order Number LM2937IMP-2.5, LM2937IMP-3.3, See NS Package Number T03B See NS Package Number MA04A TO-263 Surface-Mount Package 10011327 Side View 10011326 Top View Order Number LM2937ES-2.5, LM2937ES-3.3, See NS Package Number TS3B 2005 National Semiconductor Corporation DS100113 www.national.comConnection Diagrams and Ordering Information (Continued) Temperature Output Voltage NSC Package Range 2.5 3.3 Package Drawing 40C T 125C LM2937ES-2.5 LM2937ES-3.3 TS3B TO-263 A LM2937ET-2.5 LM2937ET-3.3 T03B TO-220 40C T 85C LM2937IMP-2.5 LM2937IMP-3.3 MA04A SOT-223 A SOT-223 Package L68B L69B Markings The small physical size of the SOT-223 package does not allow sufficient space to provide the complete device part number. The actual devices will be labeled with the package markings shown. www.national.com 2 LM2937-2.5, LM2937-3.3