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MMPF0100 데이터시트(PDF) 79 Page - Freescale Semiconductor, Inc |
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MMPF0100 데이터시트(HTML) 79 Page - Freescale Semiconductor, Inc |
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79 / 136 page ![]() Analog Integrated Circuit Device Data Freescale Semiconductor 79 PF0100 Functional Block Requirements and Behaviors Power Generation 7.4.5 Boost Regulator SWBST is a boost regulator with a programmable output from 5.0 to 5.15 V. SWBST can supply the VUSB regulator for the USB PHY in OTG mode, as well as the VBUS voltage. Note that the parasitic leakage path for a boost regulator will cause the SWBSTOUT and SWBSTFB voltage to be a Schottky drop below the input voltage whenever SWBST is disabled. The switching NMOS transistor is integrated on-chip. Figure 22 shows the block diagram and component connection for the boost regulator. SWBSTLX VOBST Driver Controller EA Z1 Z2 Internal Compensation I2C Interface SWBSTMODE VREFUV VREF GNDSWBST VIN LBST CINBST DBST SWBSTFB RSENSE SC VREFSC SWBSTFAULT OC UV COSWBST SWBSTIN Figure 22. Boost Regulator Architecture 7.4.5.1 SWBST Setup and Control Boost regulator control is done through a single register SWBSTCTL described in Table 87. SWBST is included in the power-up sequence if its OTP power-up timing bits, SWBST_SEQ[4:0], are not all zeros. Table 87. Register SWBSTCTL - ADDR 0x66 Name Bit # R/W Default Description SWBST1VOLT 1:0 R/W 0x00 Set the output voltage for SWBST 00 = 5.000 V 01 = 5.050 V 10 = 5.100 V 11 = 5.150 V SWBST1MODE 3:2 R 0x02 Set the Switching mode on Normal operation 00 = OFF 01 = PFM 10 = Auto (Default)(47) 11 = APS UNUSED 4 – 0x00 UNUSED SWBST1STBYMODE 6:5 R/W 0x02 Set the Switching mode on Standby 00 = OFF 01 = PFM 10 = Auto (Default)(47) 11 = APS |
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