lm9036qmx-5.0 National Semiconductor Corporation, lm9036qmx-5.0 Datasheet - Page 6

• Manufacturer Part Number: lm9036qmx-5.0
• Description: Lm9036q Ultra-low Quiescent Current Voltage Regulator
• Manufacturer: National Semiconductor Corporation

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Applications Information
Unlike other PNP low dropout regulators, the LM9036Q re-
mains fully operational to 40V. Owing to power dissipation
characteristics of the package, full output current cannot be
guaranteed for all combinations of ambient temperature and
input voltage.
The junction to ambient thermal resistance θ
distinct components: the junction to case thermal resistance
rating θ
θ
While the LM9036Q has an internally set thermal shutdown
point of typically 150°C, this is intended as a safety feature
CA
. The relationship is defined as: θ
JC
; and the case to ambient thermal resistance rating
JA
= θ
JC
JA
+ θ
rating has two
CA
.
6
only. Continuous operation near the thermal shutdown tem-
perature should be avoided as it may have a negative affect
on the life of the device.
The LM9036Q maintains regulation to 55V, it will not with-
stand a short circuit above 40V because of safe operating
area limitations in the internal PNP pass device. Above 55V
the LM9036Q will break down with catastrophic effects on the
regulator and possibly the load as well. Do not use this device
in a design where the input operating voltage may exceed
40V, or where transients are likely to exceed 55V.