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ISL6218CRZ Datasheet(PDF) 9 Page - Renesas Technology Corp |
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ISL6218CRZ Datasheet(HTML) 9 Page - Renesas Technology Corp |
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9 / 19 page  ISL6218 FN9101 Rev 6.00 Page 9 of 19 August 6, 2007 The choice of value for soft-start capacitor is determined by the maximum slew rate required for the application. An example calculation is shown in Equation 1. Using the I1 current source on the SOFT pin as 130µA, and the slew rate of (10mV/ s), the SOFT capacitor is calculated in Equation 1: Gate Drive Signals The ISL6218 provides internal gate drive for a single channel, Synchronous Buck, Core Regulator. The ISL6218 was designed with a 4A, low side gate current sink ability, and a 2A, low-side gate current source ability to efficiently drive the latest, high performance MOSFETs. This feature will provide the system designer with flexibility in MOSFET selection as well as optimum efficiency during all modes of operation. Frequency Setting The power channel switching frequency is set up by a resistor from the FSET pin to ground. The choice of FSET resistance for a desired switching frequency can be approximated using Figure 3. The switching frequency is designed to operate between 250kHz and 500kHz per phase. CORE Voltage Programming The voltage identification pins (VID0, VID1, VID2, VID3, VID4 and VID5) set the DAC output voltage. These pins do not have internal pull-up or pull-down capability. These pins will recognize 1.0V, 3.3V or 5.0V CMOS logic. Table 1 shows the command voltage, VDAC for the 6 bit VID codes. The IC responds to VID code changes as shown in Figure 5. PGOOD is masked between these transitions. µF 012 . 0 mV 10 µs 1 µA 130 SlewRate I C SOURCE SOFT (EQ. 1) FIGURE 3. CHANNEL SWITCHING FREQUENCY vs RFSET 250k 500k 750k 1M 0 50 100 150 200 250 CHANNEL SWITCHING FREQUENCY, fSW (Hz) TABLE 1. INTEL IMPV-IV VID CODES VID5 VID4 VID3 VID2 VID1 VID0 VDAC 0 0 0 0 0 0 1.708 0 0 0 0 0 1 1.692 0 0 0 0 1 0 1.676 0 0 0 0 1 1 1.660 0 0 0 1 0 0 1.644 0 0 0 1 0 1 1.628 0 0 0 1 1 0 1.612 0 0 0 1 1 1 1.596 0 0 1 0 0 0 1.580 0 0 1 0 0 1 1.564 0 0 1 0 1 0 1.548 0 0 1 0 1 1 1.532 0 0 1 1 0 0 1.516 0 0 1 1 0 1 1.500 0 0 1 1 1 0 1.484 0 0 1 1 1 1 1.468 0 1 0 0 0 0 1.452 0 1 0 0 0 1 1.436 0 1 0 0 1 0 1.420 0 1 0 0 1 1 1.404 FIGURE 4. SOFT-START TRACKING CIRCUITRY SHOWING INTERNAL CURRENT SOURCES AND “DROOP” FOR ACTIVE, DEEP AND DEEPER SLEEP MODES OF OPERATION CSOFT SOFT EA+ RDROOP ISL6218 IDROOP + VDROOP + ERROR AMPLIFIER |
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