LP2950-N, LP2951-N
www.ti.com
SNVS764Q –JANUARY 2000–REVISED DECEMBER 2017
9.2.12 Low Battery Disconnect
In Figure 54, a band-gap voltage reference LM385 is used to generate shutdown signal, when Vin < 5.5 V, the
LP2951 turns off and turns on again when VIN > 6 V.
For values shown, regulator shuts down when Vin < 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, and the LP2951 output voltage is close to VIN.
When ambient temperature raise higher than protection target, LM34/35's output voltage is higher than 1.235-V
feedback voltage, the internal pass transistor turns off, and the LP2951 output goes off.
LM34 for 125°F shutdown
LM35 for 125°C shutdown
Figure 55. System Overtemperature Protection Circuit
Copyright © 2000–2017, Texas Instruments Incorporated
Submit Documentation Feedback
31
Product Folder Links: LP2950-N LP2951-N
TI [ TEXAS INSTRUMENTS ]
