|Description||5-A Low Dropout Positive Regulators|
|LM1084ISX-3.3/NOPB Datasheet PDF : 29 Pages |
SNVS037G – SEPTEMBER 1999 – REVISED JANUARY 2015
Typical Applications (continued)
8.2.3 5-V Regulator With Shutdown
A variation of the 5 V output regulator application with shutdown control is shown in Figure 18 based on the
LM1084-ADJ. It uses a simple NPN transistor on the ADJ pin to block or sink the current on the ADJ pin. If the
TTL logic is pulled high, the NPN transistor is activated and the part is disabled, outputting approximately 1.25 V.
If the TTL logic is pulled low, the NPN transistor is unbiased and the regulator functions normally.
Figure 18. 5-V Regulator with Shutdown
8.2.4 Battery Charger
The LM1084-ADJ can be used as a battery charger to regulate the charging current required by the battery bank
as shown in Figure 19. In this application the LM1084 acts as a constant voltage, constant current part by
sensing the voltage potential across the battery and compensating it to the current voltage. To maintain this
voltage, the regulator delivers the maximum charging current required to charge the battery. As the battery
approaches the fully charged state, the potential drop across the sense resistor, RS,reduces and the regulator
throttles back the current to maintain the float voltage of the battery.
Figure 19. Battery Charger
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