National LM2925 free download

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LM2925 Low Dropout Regulator with Delayed Reset April 1998 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 active low state for the duration of the delay. Types of errors detected include any that cause the output to become unregulated: low input voltage, thermal shutdown, short circuit, input transients, etc. No external pull-up resistor is necessary. The current charging the delay capacitor is very low, allowing 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 insertion. Familiar regulator features such as short circuit and thermal overload protection are also provided. Features n n n n n n n n n n n 5V, 750 mA output Externally set delay for reset Input-output differential less than 0.6V at 0.5A Reverse battery protection 60V load dump protection -50V reverse transient protection Short circuit protection Internal thermal overload protection Available in plastic TO-220 Long delay times available P+ Product Enhancement tested Typical Application Circuit Connection Diagram TO-220 5-Lead DS005268-2 Order Number LM2925T See NS Package Number T05A DS005268-1 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. *Required if regulator is located far from power supply filter. **COUT must be at least 10 µF to maintain stability. May be increased FIGURE 1. Test and Application Circuit © 1998 National Semiconductor Corporation DS005268 www.national.com Absolute Maximum Ratings (Note 1) If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Input Voltage Operating Range Overvoltage Protection 26V 60V Internal Power Dissipation (Note 2) Operating Temperature Range Maximum Junction Temperature Storage Temperature Range Lead Temperature (Soldering, 10 seconds) ESD rating is to be determined Internally Limited -40°C to + 125°C 150°C -65°C to + 150°C 260°C VOUT Electrical Characteristics VIN = 14V, C2 = 10 µf, IO = 500 mA, TJ = 25°C (Note 4) (unless otherwise specified) Parameter Output Voltage Line Regulation Load Regulation Output Impedance Quie