LP2951-N_15_15 Datasheet, PDF (30/50 Pages) Texas Instruments – LP295x-N Series of Adjustable Micropower Voltage Regulators

LP2950-N, LP2951-N
SNVS764O – JANUARY 2000 – REVISED DECEMBER 2014
www.ti.com
9.2.12 Low Battery Disconnect
In Figure 54, a band-gap voltage reference LM385 is used to generate shutdown signal, when V_in < 5.5 V, the
LP2951 turns off and turns on again when V_IN > 6 V.
For values shown, regulator shuts down when V_in < 5.5 V and turns on again at 6 V. Current drain in disconnected
mode is approximately 150 μA.
*Sets disconnect voltage.
**Sets disconnect hysteresis.
Figure 54. Low Battery Disconnect
9.2.13 System Overtemperature Protection Circuit
In Figure 55, temperature sensors LM34/35's output voltage is linearly proportional to the Celsius (Centigrade)
temperature.
At room temperature, LM34/35's output voltage is lower than 1.235-V feedback voltage, the internal pass
transistor fully turns on, LP2951 output voltage is close to V_IN.
When ambient temperature raise higher than protection target, LM34/35's output voltage will be higher than
1.235-V feedback voltage, the internal pass transistor turns off, the LP2951 output will go off.
LM34 for 125°F Shutdown
LM35 for 125°C Shutdown
Figure 55. System Overtemperature Protection Circuit
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