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PDF LM9036 Data sheet ( Hoja de datos )
| Número de pieza | LM9036 | |
| Descripción | Ultra-Low Quiescent Current Voltage Regulator | |
| Fabricantes | National Semiconductor | |
| Logotipo |  |
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April 2004
LM9036
Ultra-Low Quiescent Current Voltage Regulator
General Description
The LM9036 ultra-low quiescent current regulator features
low dropout voltage and low current in the standby mode.
With less than 25µA Ground Pin current at a 0.1mA load, the
LM9036 is ideally suited for automotive and other battery
operated systems. The LM9036 retains all of the features
that are common to low dropout regulators including a low
dropout PNP pass device, short circuit protection, reverse
battery protection, and thermal shutdown. The LM9036 has
a 40V maximum operating voltage limit, a −40˚C to +125˚C
operating temperature range, and ±5% output voltage toler-
ance over the entire output current, input voltage, and tem-
perature range.
Features
n Ultra low Ground Pin current (IGND ≤ 25µA for IOUT
= 0.1mA)
n Fixed 5V, 3.3V, 50mA output
n Output tolerance ±5% over line, load, and temperature
n Dropout voltage typically 200mV @ IOUT = 50mA
n −45V reverse transient protection
n Internal short circuit current limit
n Internal thermal shutdown protection
n 40V operating voltage limit
Typical Application
* Required if regulator is located more than 2" from power supply filter capacitor.
20001101
** Required for stability. Must be rated over intended operating temperature range. Effective series resistance (ESR) is critical, see Electrical
Characteristics. Locate capacitor as close as possible to the regulator output and ground pins. Capacitance may be increased without bound.
© 2004 National Semiconductor Corporation DS200011
www.national.com
1 page  
Typical Performance Characteristics (Continued)
Quiescent Current
Quiescent Current
20001113
Peak Output Current
20001114
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 θJA rating has
two distinct components: the junction to case thermal resis-
tance rating θJC; and the case to ambient thermal resistance
rating θCA. The relationship is defined as: θJA = θJC + θCA.
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 θJA rating to approximately 50˚C/W.
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.
20001117
Using the θJA for a LM9036DT mounted on a circuit board as
defined at (Note 8), and using the formula for maximum
allowable dissipation given in (Note 3) for an ambient tem-
perature (TA) of +85˚C, we find that PDMAX = 1.3W. Including
the small contribution of the quiescent current IQ to the total
power 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 ambient temperature of 25˚C the PDMAX = 2.5W, and
the 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
withstand a short circuit above 40V because of safe operat-
ing 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.
5 www.national.com
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| Páginas | Total 7 Páginas | |
| PDF Descargar | [ Datasheet LM9036.PDF ] | |
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