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LM3940IMPX-3.3 Datasheet(PDF) 1 Page - Texas Instruments |
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LM3940IMPX-3.3 Datasheet(HTML) 1 Page - Texas Instruments |
1 / 18 page LM3940 www.ti.com SNVS114E – MAY 1999 – REVISED MARCH 2013 LM3940 1A Low Dropout Regulator for 5V to 3.3V Conversion Check for Samples: LM3940 1 FEATURES APPLICATIONS 2 • Output voltage specified over temperature • Laptop/Desktop Computers • Excellent load regulation • Logic Systems • Specified 1A output current • Requires only one external component • Built-in protection against excess temperature • Short circuit protected DESCRIPTION The LM3940 is a 1A low dropout regulator designed to provide 3.3V from a 5V supply. The LM3940 is ideally suited for systems which contain both 5V and 3.3V logic, with prime power provided from a 5V bus. Because the LM3940 is a true low dropout regulator, it can hold its 3.3V output in regulation with input voltages as low as 4.5V. The TO-220 package of the LM3940 means that in most applications the full 1A of load current can be delivered without using an additional heatsink. The surface mount DDPAK/TO-263 package uses minimum board space, and gives excellent power dissipation capability when soldered to a copper plane on the PC board. TYPICAL APPLICATION *Required if regulator is located more than 1 ″ from the power supply filter capacitor or if battery power is used. **See APPLICATION HINTS. CONNECTION DIAGRAM Figure 1. 3-Lead TO-220 Package Figure 2. 3-Lead DDPAK/TO-263 Package (Front View) (Front View) Drawing Number NDE00EB Drawing Number KTT003B Figure 3. 3-Lead SOT-223 (Front View) Drawing Number DCY (R-PDSO-G4) 1 Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet. 2 All trademarks are the property of their respective owners. PRODUCTION DATA information is current as of publication date. Copyright © 1999–2013, Texas Instruments Incorporated Products conform to specifications per the terms of the Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters. |
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