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LD3985XX25 Fiches technique(PDF) 1 Page - STMicroelectronics |
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LD3985XX25 Fiches technique(HTML) 1 Page - STMicroelectronics |
1 / 22 page December 2007 Rev 12 1/22 22 LD3985xx Ultra low drop-low noise BiCMOS voltage regulators low ESR capacitors compatible Features ■ Input voltage from 2.5 V to 6 V ■ Stable with low ESR ceramic capacitors ■ Ultra low dropout voltage (100 mV typ. at 150 mA load, 0.4 mV typ. at 1 mA load) ■ Very low quiescent current (85 µA typ. at no load, 170 µA typ. at 150 mA load; max 1.5 µA in OFF mode) ■ Guaranteed output current up to 150 mA ■ Wide range of output voltage: 1.22 V; 1.8 V; 2.5 V; 2.6 V; 2.7 V; 2.8 V; 2.9 V; 3 V; 3.3 V; 4.7 V ■ Fast turn-on time: typ. 200 µs [CO = 1 µF, CBYP = 10 nF and IO = 1 mA] ■ Logic-controlled electronic shutdown ■ Internal current and thermal limit ■ Output low noise voltage 30 µVRMS over 10 Hz to 100 kHz ■ S.V.R. of 60 dB at 1 kHz, 50 dB at 10 kHz ■ Temperature range: -40 °C to 125 °C Description The LD3985xx provides up to 150 mA, from 2.5 V to 6 V input voltage. The ultra low drop-voltage, low quiescent current and low noise make it suitable for low power applications and in battery powered systems. Regulator ground current increases only slightly in dropout, further prolonging the battery life. Power supply rejection is better than 60 dB at low frequencies and starts to roll off at 10 kHz. High power supply rejection is maintained down to low input voltage levels common to battery operated circuits. 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. The LD3985xx is designed to work with low ESR ceramic capacitors. Typical applications are in mobile phone and similar battery powered wireless systems. Flip-chip TSOT23-5L SOT23-5L (1.57x1.22) Table 1. Device summary Part number LD3985XX122 LD3985XX28 LD3985XX18 LD3985XX29 LD3985XX25 LD3985XX30 LD3985XX26 LD3985XX33 LD3985XX27 LD3985XX47 www.st.com |
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