LP2950-N, LP2951-N
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SNVS764Q –JANUARY 2000–REVISED DECEMBER 2017
*High input lowers Vout to 2.5 V.
Figure 51. 5-V Regulator with 2.5-V Sleep Function
9.2.10 Open Circuit Detector for 4 → 20-mA Current Loop
Figure 52 shows the open circuit detector for 4 → 20-mA current loop. The circuit outputs a high level while input
current is less than 3.5 mA.
Figure 52. Open Circuit Detector for 4 → 20-mA Current Loop
9.2.11 Regulator with State-of-Charge Indicator
In Figure 53, the LP339, a quad comparator, is used to indicate battery voltage state. The comparator’s negative
input voltage is equal to the LP2951 1.235-V feedback voltage. By adjusting R3, we can adjust positive input
voltage of C1~C3 to target value.
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