LM9036M-3.3/NOPB National Semiconductor, LM9036M-3.3/NOPB Datasheet - Page 6

• Manufacturer Part Number: LM9036M-3.3/NOPB
• Description: IC LDO REG 3.3V 50MA LOWIQ 8SOIC
• Manufacturer: National Semiconductor

Specifications of LM9036M-3.3/NOPB

• Regulator Topology: Positive Fixed
• Voltage - Output: 3.3V
• Voltage - Input: 14 ~ 40 V
• Voltage - Dropout (typical): 0.2V @ 50mA
• Number Of Regulators: 1
• Current - Output: 50mA
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: 8-SOIC (3.9mm Width)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Current - Limit (min): -
• Other names: *LM9036M-3.3; *LM9036M-3.3/NOPB; LM9036M-3.3

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Applications Information
Unlike other PNP low dropout regulators, the LM9036 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
On the TO-252 package the ground tab is thermally connect-
ed to the backside of the die. Adding 1 square inch of 2 oz.
copper pad area directly under the ground tab will improve the
θ
While the LM9036 has an internally set thermal shutdown
point of typically 150°C, this is intended as a safety feature
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.
CA
JA
. The relationship is defined as: θ
rating to approximately 50°C/W.
JC
; and the case to ambient thermal resistance rating
JA
= θ
JC
JA
+ θ
rating has two
CA
.
6
Using the θ
defined at (Note 8), and using the formula for maximum al-
lowable dissipation given in (Note 3) for an ambient temper-
ature (T
small contribution of the quiescent current I
dissipation, the maximum input voltage (while still delivering
50mA output current) is 29.5V. The LM9036DT will go into
thermal shutdown when attempting to deliver the full output
current of 50mA, with an ambient temperature of +85°C, and
the input voltage is greater than 29.5V. Similarly, with an am-
bient temperature of 25°C the P
LM9036DT can deliver the full output current of 50mA with an
input voltage of up to 40V.
While the LM9036 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 LM9036 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.
A
) of +85°C, we find that P
JA
for a LM9036DT mounted on a circuit board as
DMAX
DMAX
= 1.3W. Including the
Q
= 2.5W, and the
to the total power