介绍一下NOKIA手机用LDODA9123.008 21 April 2005 MAS9123 80 mA LDO Voltage Regulator IC Very Low Noise: 9.5 Vrms Very Short Start-up Time: 20 s Excellent Ripple Rejection: 68 dB Stable with Low-ESR Output Capacitors Low Minimum Output Capacitance Requirement: 0.23 F Regulator Enable/Disable Control DESCRIPTION MAS9123 is a low dropout voltage regulator with an enable/disable pin, which allows device to be turned off or on by pulling control to low or high. Due to the very low noise level of only 9.5 Vrms MAS9123 is highly suitable for very sensitive circuits, e.g., in portable applications. In addition to the noise level, MAS9123 excels in dropout voltage (95 mV typical at 50 mA) and in start-up time (with bypass capacitor typically 20 s from start-up to within ±1% of VOUT(NOM)). Also its ripple rejection abil……