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AIC1730-28 Datasheet(PDF) 10 Page - Analog Intergrations Corporation

Part # AIC1730-28
Description  150mA, Low Noise, Low Dropout Linear Regulator
Download  12 Pages
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Manufacturer  AIC [Analog Intergrations Corporation]
Direct Link  http://www.analog.com.tw
Logo AIC - Analog Intergrations Corporation

AIC1730-28 Datasheet(HTML) 10 Page - Analog Intergrations Corporation

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AIC1730
10
APPLICATION INFORMATION
INPUT-OUTPUT CAPACITORS
Linear regulators require input and output
capacitors to maintain stability. Input capacitor
at 1
μF with 1uF aluminum electrolytic output
capacitor is recommended. And it should be
selected within the Equivalent Series Resistance
(ESR) range as shown in the figure 21, 22, 23,
and 24. ESR of ceramic capacitor is lower and
its electrical characteristics (capacitance and
ESR) vary widely over temperature. In general,
tantalum
or
electric
output
capacitor
is
suggested for heavy load.
Normally, the output capacitor should be 1
μF
(aluminum electrolytic) at least and rates for
operating temperature range. Note that it’s
important
to
check
selected
manufactures
electrical characteristics (capacitance and ESR)
over temperature.
NOISE BYPASS CAPACITOR
0.1
μF bypass capacitor at BP pin reduces output
voltage noise. And the BP pin has to connect a
capacitor to GND.
POWER DISSIPATION
The maximum power dissipation of AIC1742
depends on the thermal resistance of its case
and circuit board, the temperature difference
between the die junction and ambient air, and
the rate of airflow. The rate of temperature rise is
greatly
affected
by
the
mounting
pad
configuration on the PCB, the board material,
and the ambient temperature. When the IC
mounting with good thermal conductivity is used,
the junction temperature will be low even when
large power dissipation applies.
The power dissipation across the device is
P = IOUT (VIN-VOUT).
The maximum power dissipation is:
)
R
θ
(R
θ
)
T
(T
P
BA
JB
A
J
MAX
+
=
Where TJ-TA is the temperature difference
between the die junction and the surrounding air,
R
θ
JB is the thermal resistance of the package,
and R
θ
BA is the thermal resistance through the
PCB, copper traces, and other materials to the
surrounding air.
As a general rule, the lower temperature is, the
better reliability of the device is. So the PCB
mounting pad should provide maximum thermal
conductivity to maintain low device temperature.
GND pin performs a dual function of providing
an
electrical
connection
to
ground
and
channeling heat away. Therefore, connecting the
GND pin to ground with a large pad or ground
plane would increase the power dissipation and
reduce the device temperature.


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