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AS3543 데이터시트(PDF) 32 Page - ams AG |
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AS3543 데이터시트(HTML) 32 Page - ams AG |
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32 / 92 page ![]() www.austriamicrosystems.com Revision 1.11 31 - 91 AS3543 3v2 Data Sheet - D e t a i l e d D e s c r i p t i o n - P o w e r M a n a g e m e n t F u n c t i o n s 9.1.4 LDO3 & LDO4 These LDOs can be used to generate the periphery voltage for the digital processor or other external components (e.g. ext. DAC, USB-PHY, SD-Cards, NAND-Flashes, FM-Tuner …) LDO3 has a separate input pin (BVDDP1) which can be connected to either the battery or a DCDC converter output. Input Voltage BVDDP1 or BVDD Output Voltage is PVDD1 & PVDD2 (1.2 to 3.5V) Default value at start-up is defined by VPRG2 pin Driver strength: 100mA, can be programmed to 200mA 9.1.5 Parameter BVDD=3.6V, TA= 25 o C, unless otherwise mentioned Table 20. LDO Parameter Symbol Parameter Condition Min Typ Max Unit RON On resistance 1 PSRR Power supply rejection ratio f=1kHz 70 dB f=100kHz 40 IOFF Shut down current 100 nA IVDD Supply current without load 50 µA Noise Output noise 10Hz < f < 100kHz 50 µVrms tstart Startup time 200 µs Vout_tol Output voltage tolerance minimum +/- 50mV -2.5% 2.5% mV VLineReg Line regulation LDO2, Static <1 mV LDO2, Transient; Slope: tr=10µs <10 VLoadReg Load regulation LDO2, Static <1 mV LDO2, Transient; Slope: tr=10µs <10 ILIMIT Current limitation LDO1 100 LDO2, LDO3, LDO4 200 mA LDO2, LDO3 and LDO4, has to be enabled via register 18h-1, 18h-2, 18h-3 350 |
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