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LTC1706-63 Datasheet(PDF) 5 Page - Linear Integrated Systems |
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LTC1706-63 Datasheet(HTML) 5 Page - Linear Integrated Systems |
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5 / 8 page  5 LTC1706-63 170663f Table 1. VID Inputs and Corresponding Output Voltage CODE VID4 VID3 VID2 VID1 VID0 OUTPUT 00000 GND GND GND GND GND 1.4125V 00001 GND GND GND GND Float 1.4000V 00010 GND GND GND Float GND 1.3875V 00011 GND GND GND Float Float 1.3750V 00100 GND GND Float GND GND 1.3625V 00101 GND GND Float GND Float 1.3500V 00110 GND GND Float Float GND 1.3375V 00111 GND GND Float Float Float 1.3250V 01000 GND Float GND GND GND 1.3125V 01001 GND Float GND GND Float 1.3000V 01010 GND Float GND Float GND 1.2875V 01011 GND Float GND Float Float 1.2750V 01100 GND Float Float GND GND 1.2625V 01101 GND Float Float GND Float 1.2500V 01110 GND Float Float Float GND 1.2375V 01111 GND Float Float Float Float 1.2250V 10000 Float GND GND GND GND 1.2125V 10001 Float GND GND GND Float 1.2000V 10010 Float GND GND Float GND 1.1875V 10011 Float GND GND Float Float 1.1750V 10100 Float GND Float GND GND 1.1625V 10101 Float GND Float GND Float 1.1500V 10110 Float GND Float Float GND 1.1375V 10111 Float GND Float Float Float 1.1250V 11000 Float Float GND GND GND 1.1125V 11001 Float Float GND GND Float 1.1000V 11010 Float Float GND Float GND 1.0875V 11011 Float Float GND Float Float 1.0750V 11100 Float Float Float GND GND 1.0625V 11101 Float Float Float GND Float 1.0500V 11110 Float Float Float Float GND 1.0375V 11111 Float Float Float Float Float 1.0250V OPERATIO When all five VID inputs are high or floating, such as when no CPU is present in a system, a regulated 1.025V output is generated at VSENSE. 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 either be 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 unwanted stray pickup. When used with the LTC1629-6, the LTC1706-63’s FB, SENSE, VCC and GND pins should be connected, respec- tively, with the EAIN, VDIFFOUT, INTVCC and SGND pins of the LTC1629-6. The result of this application is a precisely controlled, variable output voltage supply to any low voltage, high current system such as a powerful personal computer, workstation or network server. 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 LTC1706-63 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 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 pull-up resistance of 40k Ω. VID Programming A list of programmed inputs and their corresponding output voltages is shown in Table 1. Programming is accomplished by applying the proper voltage (or float condition) on the five digital VID inputs. |
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