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LT1580IQ Datasheet(PDF) 6 Page - Linear Technology |
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LT1580IQ Datasheet(HTML) 6 Page - Linear Technology |
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6 / 16 page  6 LT1580/LT1580-2.5 BLOCK DIAGRA – + VCONTROL VPOWER SENSE VOUT 1580 BD FOR FIXED VOLTAGE DEVICE GND ADJ APPLICATIONS INFORMATION The LT1580 is a low dropout regulator designed to power the new generation of microprocessors. Low dropout regulators have become more common in desktop com- puter systems as microprocessor manufacturers have moved away from 5V only CPUs. A wide range of supply requirements exists today with new voltages just over the horizon. In many cases the input-output differential is very small, effectively disqualifying many of the low dropout regulators on the market today. The LT1580 is designed to make use of multiple power supplies, present in most systems, to reduce the dropout voltage. This two supply approach maximizes efficiency. The second supply, at least 1V greater than the output voltage, is used to provide power for the control circuitry and supply the drive current to the NPN output transistor. This allows the NPN to be driven into saturation, thereby reducing the dropout voltage by a VBE compared to conventional designs. The current requirement for the control voltage is relatively small, equal to approximately 1% of the output current or about 70mA for a 7A load. The bulk of this current is drive current for the NPN output transistor. This drive current becomes part of the output current. The control voltage must be at least 1V greater than the output voltage to obtain optimum performance. The maxi- mum voltage on the VCONTROL pin is 13V. The maximum voltage at the VPOWER pin is limited to 7V. GDN pin current for fixed voltage devices is 6mA (typ) and is constant as a function of load. ADJ pin current for adjustable devices is 60 µA at 25°C and varies proportional to absolute tempera- ture. |
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