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SI9183 データシート(PDF) 10 Page - Vishay Siliconix |
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SI9183 データシート(HTML) 10 Page - Vishay Siliconix |
10 / 11 page Si9183 Vishay Siliconix www.vishay.com 10 Document Number: 71258 S-51147—Rev. G, 20-Jun-05 DETAILED DESCRIPTION The Si9183 is a low drop out, low quiescent current, linear regulator family with very fast transient response. It is primarily designed for battery powered applications where battery run time is at a premium. The low quiescent current allows extended standby time while low drop out voltage enables the system to fully utilize battery power before recharge. The Si9183 is a very fast regulator with bandwidth exceeding 50 kHz while maintaining low quiescent current at light load conditions. With this bandwidth, the Si9183 is one of the fastest LDO available today. The Si9183 is stable with one of any output capacitor types from 1 mF to 10.0 mF. However, X5R or X7R ceramic capacitors are recommended for best output noise and transient performance. VIN VIN is the input supply pin. The bypass capacitor for this pin is not critical as long as the input supply has low enough source impedance. For practical circuits, a 1.0-mF or larger ceramic capacitor is recommended. When the source impedance is not low enough and/or the source is several inches from the Si9183, then a larger input bypass capacitor is needed. It is required that the equivalent impedance (source impedance, wire, and trace impedance in parallel with input bypass capacitor impedance) must be smaller than the input impedance of the Si9183 for stable operation. When the source impedance, wire, and trace impedance are unknown, it is recommended that an input bypass capacitor be used of a value that is equal to or greater than the output capacitor. VOUT VOUT is the output voltage of the regulator. Connect a bypass capacitor from VOUT to ground. The output capacitor can be any value from 1.0 mF to 10.0 mF. A ceramic capacitor with X5R or X7R dielectric type is recommended for best output noise, line transient, and load transient performance. GND Ground is the common ground connection for VIN and VOUT. It is also the local ground connection for CBP, ADJ, and SD. ADJ For the adjustable output version, use a resistor divider R1 and R2, connect R1 from VOUT to ADJ and R2 from ADJ to ground. R2 should be in the 25-kW to 150-kW range for low power consumption, while maintaining adequate noise immunity. The formula below calculates the value of R1, given the desired output voltage and the R2 value, (1) R1 + VOUT * VADJ R2 VADJ VADJ is nominally 1.215 V. SHUTDOWN (SD) SD controls the turning on and off of the Si9183. VOUT is guaranteed to be on when the SD pin voltage equals or is greater than 1.2 V. VOUT is guaranteed to be off when theSD pin voltage equals or is less than 0.4 V. During shutdown mode, the Si9183 will draw less than 1-mA current from the source. To automatically turn on VOUT whenever the input is applied, tie the SD pin to VIN. CBP For low noise application, connect a high frequency ceramic capacitor from CBP to ground. A 0.01-mF or a 0.1-mF X5R or X7R is recommended. Vishay Siliconix maintains worldwide manufacturing capability. Products may be manufactured at one of several qualified locations. Reliability data for Silicon Technology and Package Reliability represent a composite of all qualified locations. For related documents such as package/tape drawings, part marking, and reliability data, see http://www.vishay.com/ppg?71258. |
同様の部品番号 - SI9183_05 |
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同様の説明 - SI9183_05 |
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