LP2951-N_15 Datasheet, PDF (28/51 Pages) Texas Instruments – LP295x-N Series of Adjustable Micropower Voltage Regulators

LP2950-N, LP2951-N
SNVS764O – JANUARY 2000 – REVISED DECEMBER 2014
www.ti.com
*High input lowers V_out 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 will output 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, we use LP339, a quad comparator, 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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