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LM2925T Datasheet(PDF) 1 Page - National Semiconductor (TI) |
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LM2925T Datasheet(HTML) 1 Page - National Semiconductor (TI) |
1 / 8 page LM2925 Low Dropout Regulator with Delayed Reset General Description The LM2925 features a low dropout, high current regulator. Also included on-chip is a reset function with an externally set delay time. Upon power up, or after the detection of any error in the regulated output, the reset pin remains in the ac- tive low state for the duration of the delay. Types of errors de- tected include any that cause the output to become unregu- lated: low input voltage, thermal shutdown, short circuit, input transients, etc. No external pull-up resistor is neces- sary. The current charging the delay capacitor is very low, al- lowing long delay times. Designed primarily for automotive applications, the LM2925 and all regulated circuitry are protected from reverse battery installations or two-battery jumps. During line transients, such as a load dump (60V) when the input voltage to the regulator can momentarily exceed the specified maximum operating voltage, the 0.75A regulator will automatically shut down to protect both internal circuits and the load. The LM2925 cannot be harmed by temporary mirror-image inser- tion. Familiar regulator features such as short circuit and thermal overload protection are also provided. Features n 5V, 750 mA output n Externally set delay for reset n Input-output differential less than 0.6V at 0.5A n Reverse battery protection n 60V load dump protection n −50V reverse transient protection n Short circuit protection n Internal thermal overload protection n Available in plastic TO-220 n Long delay times available n P + Product Enhancement tested Typical Application Circuit Connection Diagram DS005268-1 *Required if regulator is located far from power supply filter. **COUT 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 must be rated over the same operating temperature range as the regulator. The equivalent series resistance (ESR) of this capacitor is critical; see curve. FIGURE 1. Test and Application Circuit TO-220 5-Lead DS005268-2 Order Number LM2925T See NS Package Number T05A April 1998 © 1998 National Semiconductor Corporation DS005268 www.national.com |
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