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LM2926T датащи(PDF) 1 Page - National Semiconductor (TI) |
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LM2926T датащи(HTML) 1 Page - National Semiconductor (TI) |
1 / 10 page LM2926/LM2927 Low Dropout Regulator with Delayed Reset General Description The LM2926 is a 5V, 500 mA, low dropout regulator with de- layed reset. The microprocessor reset flag is set low by ther- mal shutdown, short circuits, overvoltage conditions, drop- out, and power-up. After the fault condition is corrected, the reset flag remains low for a delay time determined by the de- lay capacitor. Hysteresis is included in the reset circuit to prevent oscillations, and a reset output is guaranteed down to 3.2V supply input. A latching comparator is used to dis- charge the delay capacitor, which guarantees a full reset pulse even when triggered by a relatively short fault condi- tion. A patented quiescent current reduction circuit drops the ground pin current to 8 mA at full load when the input-output differential is 3V or more. Familiar PNP regulator features such as reverse battery pro- tection, transient protection, and overvoltage shutdown are included in the LM2926 making it suitable for use in automo- tive and battery operated equipment. The LM2927 is electrically identical to the LM2926 but has a different pin-out. The LM2927 is pin-for-pin compatible with the L4947 and TLE4260 alternatives. The LM2926 is pin-for-pin compatible with the LM2925. Features n 5% output accuracy over entire operating range n Dropout voltage typically 350 mV at 500 mA output n Externally programmed reset delay n Short circuit proof n Reverse battery proof n Thermally protected n LM2926 is pin-for-pin compatible with the LM2925 n P + Product Enhancement tested Applications n Battery operated equipment n Microprocessor-based systems n Portable instruments Typical Application Connection Diagrams and Ordering Information DS010759-1 *Required if regulator is located far (>2") from power supply filter. **CO must be at least 10 µF to maintain stability. May be increased without bound to maintain regulation during transients. Locate as close as possible to the regulator. This capacitor msut be rated over the same operating temperature range as the regulator. The equivalent series resistance (ESR) of this capacitor is critical; see curve under Typical Performance Characteristics. 5–Lead TO-220 DS010759-2 Front View Order Number LM2926T See NS Package Number TO5A 5-Lead TO-220 DS010759-14 Front View Order Number LM2927T See NS Package Number TO5A April 1998 © 1998 National Semiconductor Corporation DS010759 www.national.com |
Аналогичный номер детали - LM2926T |
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Аналогичное описание - LM2926T |
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