That would explain why it is different in the smaller LT1084- and LT1085-die.
Another explanation: That is some change in the control loop. The structures are connected to the ADJ-Pin. Anyone an idea what these structures do: LT1083-die LT1084-die LT1085-die My first assumption was that they use these structures to generate fixed output voltage regulators. LT1085 (LT1085-die) A pointy metal line and one blown fuse. Otherwise they wouldn´t have blown a fuse on a LT1084-die to use it in a LT1084. => The blown fuse shows that the fuses are not only for changing LT108x-variants, they are also used for fine adjustment. => More current but multiplicated only by two power stages (not four as in the LT1083). For example, if switch over occurs at 1 A, the regulator will supply all of the loads demand up to 1 A. The IC linear regulator is so easy to use that it is virtually foolproof, andso inexpensive that it is usually one of the cheapest components in an electronicassembly. LT1084 (LT1084-die) A broad metal line and one blown fuse. LINEAR VOLTAGE REGULATORS Introduction The linear regulator is the basic building block of nearly every power supply used inelectronics. => Less current to adjust the LT1083-die to a LT1084. LT1084 (LT1083-die) A pointy metal line and some blown fuses. Another interesting point is the shunt for current limitation: LT1083 A pointy metal line and every fuse is intact. Also reverse protection diode area is smaller.
#Power transistor voltage regulator driver#
Here you can see they shortened the output stage transistors and cutted the driver transistor in half.
#Power transistor voltage regulator series#
To continue the series today I have the LT1085 for you: Same big heatspreader but smaller die. I assume it´s a way to inject a external reference voltage. For what? The bigger Transistor base contact is then isolated and can be connected by the unused bondpad. It contains a fusible link with which you can "destroy" the bandgap reference. Perhaps they used worse dies for these regulators. With this fuses it´s possible to sell the smaller linear regulators (LT1084, LT1085, LT1086) with the same die. It seems there are four fuses to adjust the current limit of the big output stage. That could be beneficial in view of second breakdown. I assume they use one output stage for each of the two current limits. Perhaps the yellow-orange layer does some thermal expansion compensation… The LT1083 uses two output stages (green, blue). Nice! It´s the MK-version which allows a die temperature of 200☌. A switching regulator converts the dc input voltage to a switched voltage applied to a power MOSFET or BJT switch. Hi all! Today I have a LT1083 for you, a very interesting high power (7,5A) linear regulator.
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