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ISL6532ACR Datasheet(PDF) 16 Page - Intersil Corporation |
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ISL6532ACR Datasheet(HTML) 16 Page - Intersil Corporation |
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16 FN9099.5 May 5, 2008 MOSFET Selection - AGP LDO The main criteria for selection of the linear regulator pass transistor is package selection for efficient removal of heat. Select a package and heatsink that maintains the junction temperature below the rating with a maximum expected ambient temperature. The power dissipated in the linear regulator is: where IO is the maximum output current and VOUT is the nominal output voltage of the linear regulator. ISL6532A Application Circuit Figure 8 shows an application circuit utilizing the ISL6532A. Detailed information on the circuit, including a complete Bill- of-Materials and circuit board description, can be found in Application Note AN1056. P LINEAR I O V IN - VOUT () × ≅ (EQ. 13) FIGURE 8. DDR SDRAM AND AGP VOLTAGE REGULATOR USING THE ISL6532A 10.0k Ω 1 μF 5VSBY UGATE FB COMP ISL6532A C17,18 LGATE VCC12 VTT VTT + VTT VREF_IN VREF_OUT VTTSNS PGOOD +3.3V Q4 + VDDQ DRIVE2 FB2 VDDQ Q1,3 2.5V 15AMAX + + Q2,4 VCC5 NCH OCSET VDDQ GNDQ PHASE VAGP 1.5V VREF VDDQ Q5 GNDQ VDDQ VDDQ SLP_S5 SLP_S3 S5# S3# PGOOD C16 R2 1 μF L1 2.1 μH L2 2.1 μH 4.99k Ω R1 C19 0.47 μF C22 1000pF 8.87k Ω R7 C6-8 C9-12 1800 μF 22 μF 6.8nF C14 825 Ω R6 C15 C13 R5 R4 R3 22.6 Ω 1.74k Ω 19.1k Ω 56nF 1000pF 680pF C25 R10 100k Ω R9 287 Ω R8 249 Ω 220 μF C23 1 μF C24 1.25V + VDDQ C20 220 μF C21 220 μF C26 0.1 μF C27 0.1 μF C1-3 2200 μF C4,5 1 μF ISL6532A |
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