EL5129IRE-T13 データシートの表示（PDF） - Renesas Electronics
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EL5129IRE-T13 Datasheet PDF : 13 Pages
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EL5129, EL5329
Description of Operation and Application
Information
Product Description
The EL5129 and EL5329 are fabricated using a high voltage
CMOS process. They exhibit rail to rail input and output
capability and have very low power consumption. When driving
a load of 10K and 12pF, the buffers have a
-3dB bandwidth of 10MHz and exhibit 9V/µs slew rate. The
VCOM amplifier has a -3dB bandwidth of 12MHz and exhibit
10V/µs slew rate.
Input, Output, and Supply Voltage Range
The EL5129 and EL5329 are specified with a single nominal
supply voltage from 5V to 15V or a split supply with its total
range from 5V to 15V. Correct operation is guaranteed for a
supply range from 4.5V to 16.5V.
The input common-mode voltage range of the EL5129 and
EL5329 within 500mV beyond the supply rails. The output
swings of the buffers and VCOM amplifier typically extend to
within 100mV of the positive and negative supply rails with load
currents of 5mA. Decreasing load currents will extend the
output voltage even closer to each supply rails.
Output Phase Reversal
The EL5129 and EL5329 are immune to phase reversal as
long as the input voltage is limited from VS- -0.5V to VS+
+0.5V. Although the device's output will not change phase, the
input's over-voltage should be avoided. If an input voltage
exceeds supply voltage by more than 0.6V, electrostatic
protection diode placed in the input stage of the device begin to
conduct and over-voltage damage could occur.
Output Drive Capability
The EL5129 and EL5329 do not have internal short-circuit
protection circuitry. The buffers will limit the short circuit current
to ±120mA and the VCOM amplifier will limit the short circuit
current to ±170mA if the outputs are directly shorted to the
positive or the negative supply. If the output is shorted
indefinitely, the power dissipation could easily increase such
that the part will be destroyed. Maximum reliability is
maintained if the output continuous current never exceeds
±15mA for the buffers and ±100mA for the VCOM amplifier.
These limits are set by the design of the internal metal
interconnections.
The Unused Buffers
It is recommended that any unused buffers should have their
inputs tied to ground plane.
Power Dissipation
With the high-output drive capability of the EL5129 and
EL5329, it is possible to exceed the 125°C “absolute-maximum
junction temperature” under certain load current conditions.
Therefore, it is important to calculate the maximum junction
temperature for the application to determine if load conditions
need to be modified for the buffer to remain in the safe
operating area.
The maximum power dissipation allowed in a package is
determined according to:
PDMAX
=
T----J---M-----A----X-----------T----A----M----A----X--
JA
where:
• TJMAX = Maximum junction temperature
• TAMAX = Maximum ambient temperature
• JA = Thermal resistance of the package
• PDMAX = Maximum power dissipation in the package
The maximum power dissipation actually produced by an IC is
the total quiescent supply current times the total power supply
voltage, plus the power in the IC due to the loads, or:
PDMAX = VS IS + i VS+ – VOUTi ILOADi +
VS+ – VOUT ILA
when sourcing, and:
PDMAX = VS IS + i VOUTi – VS- ILOADi +
VOUT – VS- ILA
when sinking.
where:
• i = 1 to total number of buffers
• VS = Total supply voltage of buffer and VCOM
• ISMAX = Total quiescent current
• VOUTi = Maximum output voltage of the application
• VOUT = Maximum output voltage of VCOM
• ILOADi = Load current of buffer
• ILA = Load current of VCOM
If we set the two PDMAX equations equal to each other, we can
solve for the RLOAD's to avoid device overheat. The package
power dissipation curves provide a convenient way to see if the
device will overheat. The maximum safe power dissipation can
be found graphically, based on the package type and the
ambient temperature. By using the previous equation, it is a
simple matter to see if PDMAX exceeds the device's power
derating curves.
FN7430 Rev 1.00
May 13, 2005
Page 10 of 13
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