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CX1084-3.3 データシートの表示(PDF) - Unspecified

CX1084-3.3 5A Low Dropout Voltage Regulator ETC2
CX1084-3.3 Datasheet PDF : 9 Pages
1 2 3 4 5 6 7 8 9
Thermal Regulation CX1084
Adjust Pin Current
Adjust Pin Current
Temperature Stability
Long Term Stability
TA = 25°C, 30ms pulse
10mA IOUT 5A , 1.5V(VIN - VOUT) 12V
10mA IOUT 5A , 1.5V(VIN - VOUT) 12V
TA =125°C, 1000Hrs
Min Typ Max Units
0.008 0.04 %W
RMS Output Noise
(% of VOUT )
TA = 25°C , 10Hz f 10kHz
Thermal Resistance
M Package: Control Circuitry/ Power Transistor
1.5/4.0 °C/W
T Package: Control Circuitry/ Power Transistor
1.5/4.0 °C/W
Parameters identified with boldface type apply over the full operating temperature range.
Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. For guaranteed specifications and test
conditions, see the
Electrical Characteristics. The guaranteed specifications apply only for the test conditions listed.
Note 2: Line and Load regulation are guaranteed up to the maximum power dissipation of 15W. Power dissipation is determined by the
input/output differential and the output current. Guaranteed maximum power dissipation will not be available over the full input/output range.
Note 3:See thermal regulation specifications for changes in output voltage due to heating effects. Line and load regulation are measured at
a constant junction temperature by low duty cycle pulse testing. Load regulation is measured at the output lead ~1/8” from the package.
Note 4: Dropout voltage is specified over the full output current range of the device.
Note 5: Minimum load current is defined as the minimum output current required to maintain regulation. When (VIN - VOUT) = 12V the device
is guaranteed to regulate if the output current is greater than 10mA.
The CX1084 series of adjustable and fixed regulators are easy to use and have all the protection features expected in
high performance voltage regulators: short circuit protection and thermal shut-down.
Pin compatible with older three terminal adjustable regulators, these devices offer the advantage of a lower dropout voltage,
more precise reference tolerance and improved reference stability with temperature.
The circuit design used in the CX1084 series
requires the use of an output capacitor as part of the
device frequency compensation. The addition of 150uF
aluminum electrolytic or a 22uF solid tantalum on the
output will ensure stability for all operating conditions.
When the adjustment terminal is bypassed with a
capacitor to improve the ripple rejection, the requirement
for an output capacitor increases. The value of 22uF
tantalum or 150uF aluminum covers all cases of
bypassing the adjustment terminal. Without bypassing
the adjustment terminal smaller capacitors can be used
with equally good results.
To ensure good transient response with heavy load
current changes capacitor values on the order of 100uF are
used in the output of many regulators. To further improve
stability and transient response of these devices larger
values of output capacitor can be used.
Protection Diodes
Unlike older regulators, the CX1084 family does not
need any protection diodes between the adjustment pin and
the output and from the output to the input to prevent
over-stressing the die. Internal resistors are limiting the
internal current paths on the CX1084 adjustment pin,
therefore even with capacitors on the adjustment pin no
protection diode is needed to ensure device safety under
short-circuit conditions.
Diodes between the input and output are not usually
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