DescriptionThe LDS3985 provides up to 300 mA, from 2.5 V to 6 V input voltage.It is stable with ceramic and high quality tantalum capacitor. The ultra low drop voltage, low quiescent current and low noise makes it suitable for low power applications and in battery powered systems. Regulator ground current increases only slightly in dropout, further prolonging the battery life. Shutdown logic control function is available, this means that when the device is used as local regulator, it is possible to put a part of the board in standby, decreasing the total power consumption. Typical applications are in mobile phone and similar battery powered wireless systems, portable information appliances.DFN6SOT23-5LTable 1.Device summaryPart numbersOutput voltagesLDS3985XX151.5 VLDS3985XX181.8 VLDS3985XX252.5 VLDS3985XX282.8 VLDS3985XX303.0 VLDS3985XX333.3 Vwww.st.com ContentsLDS3985xx2/20 Doc ID 11039 Rev 6Contents1Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Features Input voltage from 2.5 V to 6 VStable with low ESR ceramic capacitorsUltra low dropout voltage (150 mV typ. at 300 mA load, 0.4 mV typ. at 1 mA load)Very low quiescent current (85 A typ. at no load, 200 A typ. at 300 mA load;max 1.5 A in off mode)Guaranteed output current up to 300 mAWide range of output voltage:from 1.25 V to 5.0 VFast turn-on time: typ. 240 s[C O = 2.2 F, CBYP = 33 nF and IO = 1 mA]Logic-controlled electronic shutdownInternal current and thermal limitOutput low noise voltage 30 VRMS over 10 Hz to 100 kHz SVR of 55 dB at 1 kHz, 50 dB at 10 kHzTemperature range: -40 C to 125 CDescriptionThe LDS3985 provides up to 300 mA, from 2.5 V to 6 V input voltage.It is stable with ceramic and high quality tantalum capacitor. The ultra low drop voltage, low quiescent current and low noise makes it suitable for low power applications and in battery powered systems. Regulator ground current increases only slightly in dropout, further prolonging the battery life. Shutdown lo specification does not apply for input voltage