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SI9182DH-15-T1 数据表(PDF) 10 Page - Vishay Siliconix |
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SI9182DH-15-T1 数据表(HTML) 10 Page - Vishay Siliconix |
10 / 10 page Si9182 Vishay Siliconix www.vishay.com 10 Document Number: 71150 S-41221—Rev. F, 28-Jun-04 DETAILED DESCRIPTION The Si9182 is a low drop out, low quiescent current, and very 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 Si9182 is a very fast regulator with bandwidth exceeding 50 kHz while maintaining low quiescent current at light load conditions. With this bandwidth, the Si9182 is the fastest LDO available today. The Si9182 is stable with any output capacitor type 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 Si9182, 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 Si9182 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 CNOISE, DELAY, SENSE or ADJ, and SD. SENSE or ADJ SENSE is used to sense the output voltage. Connect SENSE to VOUT for the fixed voltage version. 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 Si9182. VOUT is guaranteed to be on when the SD pin voltage equals or is greater than 1.5 V. VOUT is guaranteed to be off when theSD pin voltage equals or is less than 0.4 V. During shutdown mode, the Si9182 will draw less than 2-mA current from the source. To automatically turn on VOUT whenever the input is applied, tie the SD pin to VIN. ERROR ERROR is an open drain output that goes low when VOUT is less than 5% of its normal value. As with any open drain output, an external pull up resistor is needed. When a capacitor is connected from DELAY to GROUND, the error signal transition from low to high is delayed (see Delay section). This delayed error signal can be used as the power-on reset signal for the application system. (Refer to Figure 4.) The ERROR pin is disconnected if not used. DELAY A capacitor from DELAY to GROUND sets the time delay for ERROR going from low to high state. The time delay can be calculated using the following formula: (2) Tdelay + VADJ Cdelay Idelay The DELAY pin should be an open circuit if not used. CNOISE For low noise application, connect a high frequency ceramic capacitor from CNOISE to ground. A 0.01-mF or a 0.1-mF X5R or X7R is recommended. |
类似零件编号 - SI9182DH-15-T1 |
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类似说明 - SI9182DH-15-T1 |
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