Datasheet

LM20136
www.ti.com
SNVS564B JANUARY 2009REVISED APRIL 2013
Figure 28. Powergood Behavior
UVLO
The LM20136 has a built-in under-voltage lockout protection circuit that keeps the device from switching until the
input voltage reaches 2.7V (typical). The UVLO threshold has 45 mV of hysteresis that keeps the device from
responding to power-on glitches during start up. If desired the turn-on point of the supply can be changed by
using the precision enable pin and a resistor divider network connected to V
IN
as shown in Figure 34 in the
design guide.
Thermal Protection
Internal thermal shutdown circuitry is provided to protect the integrated circuit in the event that the maximum
junction temperature is exceeded. When activated, typically at 160°C, the LM20136 tri-states the power FETs
and resets soft start. After the junction cools to approximately 150°C, the part starts up using the normal start up
routine. This feature is provided to prevent catastrophic failures from accidental device overheating.
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