SI91841

Si91841/3 Vishay Siliconix 150-mA Ultra Low-Noise LDO Regulator With Discharge Option FEATURES D Ultra Low Dropout—130 mV at 150-mA Load D Ultra Low Noise—30 mV(rms) (10-Hz to 100-kHz Bandwidth) D Shutdown Control D 110-mA Ground Current at 150-mA Load D 1.5% Guaranteed Output Voltage Accuracy D 300-mA Peak Output Current Capability D Uses Low ESR Ceramic Capacitors D Fast Start-Up (50 ms) D Fast Line and Load Transient Response (v 30 ms) D 1-mA Maximum Shutdown Current D Output Current Limit D Reverse Battery Protection D Built-in Short Circuit and Thermal Protection D Si91841: Output, Auto-Discharge In Shutdown Mode D Si91843: Output, No-Discharge In Shutdown Mode D Fixed 1.8, 2.0, 2.2, 2.5, 2.6, 2.7, 2.8, 2.85, 2.9, 3.0, 3.3, 3.5, 3.6, 5.0-V Output Voltage Options D Thin SOT23-5 Package APPLICATIONS D Cellular Phones, Wireless Handsets D Noise-Sensitive Electronic Systems, Laptop and Palmtop Computers D PDAs D Pagers D Digital Cameras D MP3 Player D Wireless Modem DESCRIPTION The Si91841/3 is a 150-mA CMOS LDO (low dropout) voltage regulator. It is the perfect choice for low voltage, low power applications. An ultra low ground current makes this part attractive for battery operated power systems. The Si91841/3 also offers ultra low dropout voltage to prolong battery life in portable electronics. Systems requiring a quiet voltage source, such as RF applications, will benefit from the Si91841/3’s ultra low output noise. An external noise bypass capacitor connected to the ...