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ISL24003IRZ-T7 Datasheet(PDF) 8 Page - Intersil Corporation |
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ISL24003IRZ-T7 Datasheet(HTML) 8 Page - Intersil Corporation |
8 / 10 page 8 FN6118.0 December 7, 2005 Description of Operation and Application Information Product Description The ISL24003 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 ISL24003 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 ISL24003 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 ISL24003 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 ISL24003 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 150mA 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 10mA for the buffers and 60mA 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 ISL24003, 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: where: •TJMAX = Maximum junction temperature •TAMAX = Maximum ambient temperature • θJA = 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: when sourcing, and: 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. PDMAX TJMAX - TAMAX Θ JA --------------------------------------------- = PDMAX VS IS ΣiVS+ ( [ VOUTi) ILOADi] VS+ ( VOUT) ILA × – + × – × + × = PDMAX VS IS ΣiV ( OUTi [ VS-) ILOADi] VOUT ( VS-) ILA × – + × – × + × = ISL24003 |
Similar Part No. - ISL24003IRZ-T7 |
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Similar Description - ISL24003IRZ-T7 |
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