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AS3525 Datasheet(PDF) 126 Page - ams AG |
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AS3525 Datasheet(HTML) 126 Page - ams AG |
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126 / 194 page  AS3525-A/-B C22O22 Data Sheet, Confidential © 2005-2009, austriamicrosystems AG, 8141 Unterpremstaetten, Austria-Europe. All Rights Reserved. www.austriamicrosystems.com Revision 1.13 126 - 194 7.4.4 Charge-Pump Step-Down Converter 7.4.4.1 General This converter will be used to supply the core voltage for a microprocessor. • Input Voltage CPVDD • Output Voltage 1.05 to 1.2 V • Voltage setting via CVDDp<1:0> bits in 4 steps • regulated 2:1 charge pump with pulse skipping • scaleable switches according to BVDD • Bypass LDO for higher currents or lower battery voltages respectively • Driver strength: 50mA / 200mA with bypass LDO Figure 48 CP Block Diagram 7.4.4.2 Mode Description Three different functional parts generate core supply voltage CVDD. The switching between the modes is generally done automatically, but can also be manually overwritten by register settings. Please observe that the charge pump block starts up in Mode 2(IOVDD length regulator mode) to avoid a current limitation and has to be switched to automatic operation by register settings. Direct length regulation from VBAT Mode1=true IF ((1.2V+Vmargin1) < VBAT_1V < (VTH1)) && (NoUSB) • Vmargin1=50mV/150mV (100mV hysteretic) • VTH1=1.7V/1.8V (100mV hysteretic) • VBAT LDO is used when [1.8V > VBAT_1V > 1.25V] • VBAT LDO is not used when there is high supply present from USB even when VBAT is in range. Direct length regulation from IOVDD Mode2=true IF ((Not Mode1) && (IOVDD/2 < (1.2+Vmargin2))) • Vmargin2=200mV/300mV (100mV hysteretic) • IOVDD LDO is used when VBAT LDO Mode1 is not entered and • IOVDD is not high enough to do 2:1 charge-pump regulation. Charge-Pump IOVDD division by 2 active plus length regulation Mode3=true IF ((Not Mode1) && (Not Mode2)) |
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