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LT3080EDD-1-TRPBF Datasheet(PDF) 8 Page - Linear Technology |
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LT3080EDD-1-TRPBF Datasheet(HTML) 8 Page - Linear Technology |
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8 / 24 page  LT3080-1 8 30801fa APPLICATIONS INFORMATION The LT3080-1 regulator is easy to use and has all the protection features expected in high performance regulators. Included are short-circuit protection and safe operating area protection, as well as thermal shutdown. The LT3080-1 is especially well suited to applications needing multiple rails. The new architecture adjusts down to zero with a single resistor handling modern low voltage digital IC’s as well as allowing easy parallel operation and thermal management without heat sinks. Adjusting to “zero” output allows shutting off the powered circuitry and when the input is pre-regulated—such as a 5V or 3.3V input supply—external resistors can help spread the heat. Aprecision“0”TC10μAinternalcurrentsourceisconnected to the non-inverting input of a power operational amplifier. The power operational amplifier provides a low impedance buffered output to the voltage on the non-inverting input. A single resistor from the non-inverting input to ground sets the output voltage and if this resistor is set to zero, zero output results. As can be seen, any output voltage can be obtained from zero up to the maximum defined by the input power supply. Whatisnotsoobviousfromthisarchitecturearethebenefits of using a true internal current source as the reference as opposed to a bootstrapped reference in older regulators. A true current source allows the regulator to have gain and frequency response independent of the impedance on the positive input. Older adjustable regulators, such as the LT1086 have a change in loop gain with output voltage as well as bandwidth changes when the adjustment pin is bypassed to ground. For the LT3080-1, the loop gain is unchanged by changing the output voltage or bypassing. Output regulation is not fixed at a percentage of the output voltage but is a fixed fraction of millivolts. Use of a true current source allows all the gain in the buffer amplifier to provide regulation and none of that gain is needed to amplify up the reference to a higher output voltage. The LT3080-1 also incorporates an internal ballast resistor to allow for direct paralleling of devices without the need for PC board trace resistors or sense resistors. This internal ballast resistor allows multiple devices to be paralleled directly on a surface mount board for higher output current and higher power dissipation while keeping board layout simple and easy. It is not difficult to add more regulators for higher output current; inputs of devices are all tied together, outputs of all devices are tied directly together, and SET pins of all devices are tied directly together. Because of the internal ballast resistor, devices automatically share the load and the power dissipation. The LT3080-1 has the collector of the output transistor connected to a separate pin from the control input. Since the dropout on the collector (IN pin) is only 300mV, two supplies can be used to power the LT3080-1 to reduce – + VCONTROL IN 10μA 25mΩ 30801 BD OUT SET BLOCK DIAGRAM |
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Similar Description - LT3080EDD-1-TRPBF |
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