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S-8550AA-M5T1U Datasheet(PDF) 5 Page - Seiko Instruments Inc |
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S-8550AA-M5T1U Datasheet(HTML) 5 Page - Seiko Instruments Inc |
5 / 31 page STEP-DOWN, BUILT-IN FET, SYNCHRONOUS RECTIFICATION, PWM CONTROL SWITCHING REGULATORS Rev.5.0_01 S-8550 Series 5 Absolute Maximum Ratings Table 3 Absolute Maximum Ratings (Unless otherwise specified: Ta = 25°C, VSS = 0 V) Item Symbol Absolute Maximum Rating Unit VIN pin voltage VIN VSS − 0.3 to VSS + 6.0 V FB pin voltage VFB VSS − 0.3 to VIN + 0.3 V CONT pin voltage VCONT VSS − 0.3 to VIN + 0.3 V ON/OFF pin voltage VON/OFF VSS − 0.3 to VIN + 0.3 V CONT pin current ICONT 1300 mA Power dissipation SOT-23-5 PD 600*1 mW SNT-8A 450*1 mW Operating temperature Topr −40 to +85 °C Storage temperature Tstg −40 to +125 °C *1. When mounted on printed circuit board [Mounted board] (1) Board size: 114.3 mm × 76.2 mm × t1.6 mm (2) Board name: JEDEC STANDARD51-7 Caution 1. The absolute maximum ratings are rated values exceeding which the product could suffer physical damage. These values must therefore not be exceeded under any conditions. 2. Since this IC has a built-in power MOS FET, make sure that dissipation of the power MOS FET does not exceed the allowable power dissipation of the package. (Refer to Figure 5.) Generally, dissipation of a switching regulator can be calculated by the following equation. Dissipation = (100 (%) − efficiency (%)) / efficiency (%) × output voltage × load current The greater part of dissipation depends on the built-in power MOS FET, however, dissipation of the inductor is also included. In addition, since power dissipation of the package also changes according to a mounting board or a mounting state, fully check them using an actually mounted mode. 0 400 0 Ambient temperature (Ta) [ °C] 200 500 300 100 600 700 50 100 150 SNT-8A SOT-23-5 Figure 5 Power Dissipation of Package (Mounted on Board) |
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