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MMPF0100NPEP データシート(PDF) 35 Page - Freescale Semiconductor, Inc |
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MMPF0100NPEP データシート(HTML) 35 Page - Freescale Semiconductor, Inc |
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35 / 137 page  Analog Integrated Circuit Device Data Freescale Semiconductor 35 PF0100 Functional Block Requirements and Behaviors Power Generation 6.4.4 Buck Regulators Each buck regulator is capable of operating in PFM, APS, and PWM switching modes. 6.4.4.1 Current Limit Each buck regulator has a programmable current limit. In an overcurrent condition, the current is limited cycle-by-cycle. If the current limit condition persists for more than 8.0 ms, a fault interrupt is generated. 6.4.4.2 General Control To improve system efficiency the buck regulators can operate in different switching modes. Changing between switching modes can occur by any of the following means: I2C programming, exiting/entering the Standby mode, exiting/entering Sleep mode, and load current variation. Available switching modes for buck regulators are presented in Table 28. During soft-start of the buck regulators, the controller transitions through the PFM, APS, and PWM switching modes. 3.0 ms (typical) after the output voltage reaches regulation, the controller transitions to the selected switching mode. Depending on the particular switching mode selected, additional ripple may be observed on the output voltage rail as the controller transitions between switching modes. Table 29 summarizes the Buck regulator programmability for Normal and Standby modes. Table 28. Switching Mode Description Mode Description OFF The regulator is switched off and the output voltage is discharged. PFM In this mode, the regulator is always in PFM mode, which is useful at light loads for optimized efficiency. PWM In this mode, the regulator is always in PWM mode operation regardless of load conditions. APS In this mode, the regulator moves automatically between pulse skipping mode and PWM mode depending on load conditions. Table 29. Regulator Mode Control SWxMODE[3:0] Normal Mode Standby Mode 0000 Off Off 0001 PWM Off 0010 Reserved Reserved 0011 PFM Off 0100 APS Off 0101 PWM PWM 0110 PWM APS 0111 Reserved Reserved 1000 APS APS 1001 Reserved Reserved 1010 Reserved Reserved 1011 Reserved Reserved 1100 APS PFM 1101 PWM PFM |
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