IC REG ULTRA LOW CURR 5.0V 8MSOP

 

LM2936MM-5.0/NOPB

Manufacturer Part NumberLM2936MM-5.0/NOPB
DescriptionIC REG ULTRA LOW CURR 5.0V 8MSOP
ManufacturerNational Semiconductor
LM2936MM-5.0/NOPB datasheets

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Specifications of LM2936MM-5.0/NOPB

Regulator TopologyPositive FixedVoltage - Output5V
Voltage - InputUp to 40VVoltage - Dropout (typical)0.2V @ 50mA
Number Of Regulators1Current - Output50mA
Operating Temperature-40°C ~ 125°CMounting TypeSurface Mount
Package / Case8-MSOP, Micro8™, 8-uMAX, 8-uSOP,Number Of Outputs1
PolarityPositiveInput Voltage Max40 V
Output Voltage5 VOutput TypeFixed
Dropout Voltage (max)0.1 V at 100 uAOutput Current0.05 A
Line Regulation30 mVLoad Regulation30 mV
Voltage Regulation Accuracy+/- 2 %Maximum Operating Temperature+ 125 C
Mounting StyleSMD/SMTMinimum Operating Temperature- 40 C
Lead Free Status / RoHS StatusLead free / RoHS CompliantCurrent - Limit (min)-
Other namesLM2936MM-5.0
LM2936MM-5.0TR		  
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Applications Information
Unlike other PNP low dropout regulators, the LM2936 re-
mains fully operational to 40V. Owing to power dissipation
characteristics of the available packages, full output current
cannot be guaranteed for all combinations of ambient tem-
perature and input voltage. As an example, consider an
LM2936Z–5.0 operating at 25˚C ambient. Using the formula
for maximum allowable power dissipation given in (Note 3) ,
we find that P
= 641 mW at 25˚C. Including the small
Dmax
contribution of the quiescent current to total power dissipa-
tion the maximum input voltage (while still delivering 50 mA
output current) is 17.3V. The LM2936Z–5.0 will go into ther-
mal shutdown if it attempts to deliver full output current with
an input voltage of more than 17.3V. Similarly, at 40V input
and 25˚C ambient the LM2936Z–5.0 can deliver 18 mA
maximum.
Under conditions of higher ambient temperatures, the volt-
age and current calculated in the previous examples will
drop. For instance, at the maximum ambient of 125˚C the
LM2936Z–5.0 can only dissipate 128 mW, limiting the input
voltage to 7.34V for a 50 mA load, or 3.5 mA output current
for a 40V input.
The junction to ambient thermal resistance θ
two distinct components: the junction to case thermal resis-
tance rating θ
; and the case to ambient thermal resistance
JC
rating θ
. The relationship is defined as: θ
CA
For the SO-8 and TO-252 surface mount packages the θ
rating can be improved by using the copper mounting pads
on the printed circuit board as a thermal conductive path to
extract heat from the package.
On the SO-8 package the four ground pins are thermally
connected to the backside of the die. Adding approximately
0.04 square inches of 2 oz. copper pad area to these four
pins will improve the θ
this extra pad are is placed directly beneath the package
there should not be any impact on board density.
On the TO-252 package the ground tab is thermally con-
nected to the backside of the die. Adding 1 square inch of 2
oz. copper pad area directly under the ground tab will im-
prove the θ
rating to approximately 50˚C/W.
JA
While the LM2936 has an internally set thermal shutdown
point of typically 160˚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.
While the LM2936 maintains regulation to 60V, it will not
withstand a short circuit above 40V because of safe operat-
ing area limitations in the internal PNP pass device. Above
60V the LM2936 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 60V.
rating has
JA
SHUTDOWN PIN
The LM2936BM has a pin for shutting down the regulator
output. Applying a Logic Level High (
= θ
+ θ
.
JA
JC
CA
pin will cause the output to turn off. Leaving the Shutdown
JA
pin open, connecting it to Ground, or applying a Logic Level
<
Low (
0.6V) will allow the regulator output to turn on.
11
rating to approximately 110˚C/W. If
JA
>
2.0V) to the Shutdown
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