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MSK5920-3.3ERHU Datasheet(PDF) 3 Page - M.S. Kennedy Corporation |
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MSK5920-3.3ERHU Datasheet(HTML) 3 Page - M.S. Kennedy Corporation |
3 / 7 page APPLICATION NOTES PIN FUNCTIONS VIN - This pin provides power to all internal circuitry in- cluding bias, start-up, thermal limit and overcurrent latch. Input voltage range is 2.9V to 6.5V. GND - Internally connected to ground, this pin should be connected externally by the user to the circuit ground. SHUTDOWN - There are two functions to the SHUTDOWN pin. It may be used to disable the output voltage or to reset a current latch condition. To activate the shutdown/ reset functions the user must apply a voltage greater than 1.6V to the SHUTDOWN pin. The output voltage will turn on when the SHUTDOWN pin is pulled below the thresh- old voltage. If the SHUTDOWN pin is not used, it should be connected to ground. It should be noted that with the shutdown pin tied to ground, a current latch condition can only be reset by cycling power off, then on. VOUT - This is the output pin for the device. OUTPUT CAPACITOR SELECTION Output capacitors are required to maintain regulation and stability. A 220µF surface mount tantalum capacitor in parallel with a 1.0µF ceramic capacitor from the output to ground should suffice under most conditions. If the user finds that tighter voltage regulation is needed during output transients, more capacitance may be added. If more capacitance is added to the output, the bandwidth may suffer. ESR of the output capacitors should be maintained at 0.1 Ω to 1Ω. INPUT POWER SUPPLY BYPASSING 3 FIGURE 1 Overcurrent protection is provided by the MSK 5920RH series through the use of a timed latch off circuit. The internal latch timeout is triggered by an overcurrent con- dition. To allow for start up surge currents, the timeout is approximately 5.5mS at 25°C. If the overcurrent condi- tion remains at the end of the timeout cycle, the regulator will latch off until the latch is reset. The latch condition can be reset by pulling the shutdown pin high or cycling VIN off then back on. A thermal limit condition will trigger the latch with no time out delay. OVERCURRENT LATCH To maximize transient response and minimize power sup- ply transients it is recommended that a 100µF tantalum capacitor is connected between VIN and ground. A 0.1µF ceramic capacitor should also be used for high frequency bypassing. CURRENT LIMIT AND SOA The MSK 5920RH current limit function is directly af- fected by the input and output voltages. Figure 1 illus- trates the relationship between VIN and ICL for various output voltages. It is very important for the user to con- sult the SOA curve when using input voltages which re- sult in current limit conditions beyond 4.5 Amps. When using input voltages which result in current limit above 4.5 Amps, the user must maintain output current within the SOA curve to avoid damage to the device. Note that 5 Amp maximum is due to current carrying capability of the internal wirebonds. REPLACING THE OMR9601/IRUH33P253AIM When the MSK 5920-2.5RH is used as a replacement for the IR OMR9601 or IRUH33P253AIM, the user should recognize that the MSK 5920-2.5RH does not contain in- ternal tantalum capacitors on the input and output. MSK does not typically use tantalum capacitors in space level standard products of this nature. Rev. G 1/06 |
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