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LP5900TL-1.8 Datasheet(PDF) 8 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Part # LP5900TL-1.8
Description  Ultra Low Noise, 100 mA Linear Regulator for RF/Analog Circuits Requires No Bypass Capacitor
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Manufacturer  NSC [National Semiconductor (TI)]
Direct Link  http://www.national.com
Logo NSC - National Semiconductor (TI)

LP5900TL-1.8 Datasheet(HTML) 8 Page - National Semiconductor (TI)

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Typical Performance Characteristics. Unless otherwise specified,C
IN =COUT = 0.47µF, VIN =
VOUT(NOM) + 1.0V, VEN = 1.2V, IOUT =1mA,T A =25
oC. (Continued)
Enable Start-up Time, (I
L= 1mA, VOUT = 2.8V)
Enable Start-up Time, (I
L= 100mA, VOUT = 2.8V)
20144146
20144147
Dropout Over Temperature (100mA)
20144105
Application Hints
POWER DISSIPATION AND DEVICE OPERATION
The permissible power dissipation for any package is a
measure of the capability of the device to pass heat from the
power source, the junctions of the IC, to the ultimate heat
sink, the ambient environment. Thus the power dissipation is
dependent on the ambient temperature and the thermal
resistance across the various interfaces between the die and
ambient air. As stated in (Note 5) of the electrical character-
istics, the allowable power dissipation for the device in a
given package can be calculated using the equation:
The actual power dissipation across the device can be rep-
resented by the following equation:
P
D =(VIN –VOUT)xIOUT
This establishes the relationship between the power dissipa-
tion allowed due to thermal consideration, the voltage drop
across the device, and the continuous current capability of
the device. These two equations should be used to deter-
mine the optimum operating conditions for the device in the
application.
EXTERNAL CAPACITORS
Like any low-dropout regulator, the LP5900 requires external
capacitors for regulator stability. The LP5900 is specifically
designed for portable applications requiring minimum board
space and smallest components. These capacitors must be
correctly selected for good performance.
INPUT CAPACITOR
An input capacitor is required for stability. The input capacitor
should be at least equal to or greater than the output capaci-
tor. It is recommended that a 0.47 µF capacitor be connected
between the LP5900 input pin and ground.
www.national.com
8


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