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900844 Datasheet(PDF) 62 Page - Freescale Semiconductor, Inc |
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900844 Datasheet(HTML) 62 Page - Freescale Semiconductor, Inc |
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62 / 118 page  Analog Integrated Circuit Device Data 62 Freescale Semiconductor 900844 FUNCTIONAL DEVICE OPERATION POWER SUPPLIES The output current is measured internally, digitized by the ADC, and stored in a register for the processor to access. The peak current is sensed internally for over-current protection purposes. If an over-current condition is detected, the regulator will limit the current through a cycle by cycle operation and alert the system through the VDDQFAULT signal, which will in turn assert the VRFAULT Interrupt signal. VDDQ is originally prepared to provide 1.8 V by connecting VDDQ output voltage directly to FBDDQ node, refer to Figure 27. To provide flexibility, VDDQ can also be set to 1.5 V by adding a resistor divider from VDDQ output to the FBDDQ using VCORE as voltage reference, refer to Figure 28. The following are the recommended resistor values for the feedback divider: • RFBDDQ15_1 = 680 Ω • RFBDDQ15_2 = 2.21 k Ω Figure 27. VDDQ Detailed Internal Block Diagram (VDDQ at 1.8 V) Figure 28. VDDQ Detailed Internal Block Diagram (VDDQ at 1.5 V) Main Features • Uses the VPWR rail as its power supply • It is used as a pre-regulator to many LDO rails, for enhanced efficiency and reduced thermal dissipation. It also supplies power to rails in the CPU (central processing unit), Platform controller hub, and the platform • Uses Integrated MOSFETs •4.0 MHz switching frequency • High efficiency operating modes depending on load conditions • Output can be discharged through the low side switch. • Peak current sensing with over-current protection Driver Controller EA VREF Z1 Z2 Internal Compensation PVINDDQ SWDDQ FBDDQ ISENSE5 VPWR CODDQ CINDDQ LDDQ SPI Interface PGNDDDQ VDDQ CTLVDDQ AOACCTLVDDQ VDDQFAULT Driver Controller EA VREF Z1 Z2 Internal Compensation PVINDDQ SWDDQ FBDDQ ISENSE5 VPWR CODDQ CINDDQ LDDQ SPI Interface PGNDDDQ VDDQ CTLVDDQ AOACCTLVDDQ VDDQFAULT VCORE RFBDDQ15_2 RFBDDQ15_1 |
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