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LTC1706-82 Datasheet(PDF) 6 Page - Linear Technology |
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LTC1706-82 Datasheet(HTML) 6 Page - Linear Technology |
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6 / 8 page  LTC1706-82 6 170682fa Each VID input pin is pulled up by a 40k resistor in series with a diode connected to VCC. Therefore, it should be grounded (or driven low) to produce a digital low input. It can be either floated or connected to VCC to get a digital high input. The series diode is included to prevent the input from being damaged or clamped when it is driven higher than VCC. Voltage Sensing and Feedback Pins The FB pin is a high impedance node that requires mini- mum layout distance to reduce extra loading and un- wanted stray pickup. When used with the LTC1629, the LTC1706-82’s FB, SENSE, VCC and GND pins should be connected, respec- tively, with the EAIN, VDIFFOUT, INTVCC, and SGND pins of the LTC1629. The result of this application is a precisely controlled, multiphase, variable output voltage supply to any low voltage, high current system such as a powerful personal computer, workstation or network server. True remote sense capability of the LTC1629 is also retained in this case. VID Input Characteristics The VID inputs should be driven with a maximum VIL of 0.4V and a minimum VIH of 1.6V. However, the VID input range is not limited to values less than VCC. Because of the internal diode between VCC and the pull-up resistor, the inputs can go higher than VCC without being clamped to VCC or damaging the input. This allows the LTC1706-82 to be fully logic compatible and operational over a higher input voltage range (less than the 7V absolute maximum rating). When a VID input is grounded, there will be a higher quiescent current flow from Vcc because of a resistor from Vcc through a series diode to each one of the VID inputs. This increase in quiescent current is calculated from IQ = N(VCC – VDIODE)/RPULLUP N is the number of grounded VID inputs. VDIODE is typically 0.6V while RPULLUP has a typical pullup resistance of 40k. In other words, each VID input has a typical pull up current of (VCC – 0.6)/40K, which is approximately 68µA for a 3.3V system. OPERATIO Table 1. VID Inputs and Corresponding Output Voltage CODE VID4 VID3 VID2 VID1 VID0 OUTPUT 00000 GND GND GND GND GND 1.850 00001 GND GND GND GND Float 1.825 00010 GND GND GND Float GND 1.800 00011 GND GND GND Float Float 1.775V 00100 GND GND Float GND GND 1.750V 00101 GND GND Float GND Float 1.725V 00110 GND GND Float Float GND 1.700V 00111 GND GND Float Float Float 1.675V 01000 GND Float GND GND GND 1.650V 01001 GND Float GND GND Float 1.625V 01010 GND Float GND Float GND 1.600V 01011 GND Float GND Float Float 1.575V 01100 GND Float Float GND GND 1.550V 01101 GND Float Float GND Float 1.525V 01110 GND Float Float Float GND 1.500V 01111 GND Float Float Float Float 1.475V 10000 Float GND GND GND GND 1.450V 10001 Float GND GND GND Float 1.425V 10010 Float GND GND Float GND 1.400V 10011 Float GND GND Float Float 1.375V 10100 Float GND Float GND GND 1.350V 10101 Float GND Float GND Float 1.325V 10110 Float GND Float Float GND 1.300V 10111 Float GND Float Float Float 1.275V 11000 Float Float GND GND GND 1.250V 11001 Float Float GND GND Float 1.225V 11010 Float Float GND Float GND 1.200V 11011 Float Float GND Float Float 1.175V 11100 Float Float Float GND GND 1.150V 11101 Float Float Float GND Float 1.125V 11110 Float Float Float Float GND 1.100V 11111 Float Float Float Float Float NO_CPU (1.075V) |
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