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SI91871DMP-18-T1 Datasheet(PDF) 1 Page - Vishay Siliconix |
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SI91871DMP-18-T1 Datasheet(HTML) 1 Page - Vishay Siliconix |
1 / 10 page Available Si91871 Vishay Siliconix Document Number: 72012 S-51147—Rev. F, 20-Jun-05 www.vishay.com 1 300-mA Ultra Low-Noise LDO Regulator With Discharge Option FEATURES D Ultra Low Dropout—300 mV at 300-mA Load D Ultra Low Noise—30 mVRMS (10-Hz to 100-kHz) D Shutdown Control D 130-mA Ground Current at 300-mA Load D 1.5% Guaranteed Output Voltage Accuracy D 400-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 Output, Auto-Discharge In Shutdown Mode D Fixed 1.2, 1.8, 2.5, 2.6, 2.8, 3.0, 3.3, 5.0-V Output Voltage Options D MLP33-5 PowerPAKr 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 Si91871 is a 300-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 Si91871 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 Si91871’s ultra low output noise. An external noise bypass capacitor connected to the device’s BP pin can further reduce the noise level. The Si91871 is designed to maintain regulation while delivering 400-mA peak current, making it ideal for systems that have a high surge current upon turn-on. For better transient response and regulation, an active pull-down circuit is built into the Si91871 to clamp the output voltage when it rises beyond normal regulation. The Si91871 automatically discharges the output voltage by connecting the output to ground through a 100-W n-channel MOSFET when the device is put in shutdown mode. The Si91871 features reverse battery protection to limit reverse current flow to approximately 1-mA in the event reversed battery is applied at the input, thus preventing damage to the IC. The Si91871 is available in both the standard and lead (Pb)-free 5-pin MLP33 PowerPAK packages and is specified to operate over the industrial temperature range of −40_C to 85_. TYPICAL APPLICATION CIRCUIT MLP33-5 Si91871 VIN GND SD VOUT VIN SD VOUT 2.2 mF BP 10 nF 2.2 mF |
Similar Part No. - SI91871DMP-18-T1 |
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Similar Description - SI91871DMP-18-T1 |
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