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S-8880A24-I8T1U Datasheet(PDF) 9 Page - Seiko Instruments Inc |
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S-8880A24-I8T1U Datasheet(HTML) 9 Page - Seiko Instruments Inc |
9 / 30 page ENERGY HARVESTING POWERED BY ULTRA-LOW POWER AND ULTRA-LOW VOLTAGE OPERATION BOOST CHARGE PUMP FOR STEP-UP DC-DC CONVERTER STARTUP Rev.1.0_01 S-8880A Series 9 The following are the connection examples based on the set condition. The symbols used in the connection diagrams are described in Table 9 below. Table 9 Element Name Symbol Constant Description Schottky diode SD1 − Preventing a voltage drop of the VDD pin due to output capacitor CL at step-up DC-DC converter startup Capacitor CVDD CCPOUT × 0.1 or lower Power smoothing capacitor of the step-up DC-DC converter Schottky diode SD2 − Preventing the OUT pin voltage of the S-8880A Series from exceeding the absolute maximum rating Pull-down resistor ROUT − Bleeder resistor R1 − Preventing the VM pin voltage of the S-8880A Series from exceeding the absolute maximum rating Bleeder resistor R2 − 1. VOUT ≤ 3.0 V, CL ≤ CCPOUT × 0.1, no load VIN CIN VIN CCPOUT VIN OUT VM VSS VSS CL VVOUT VDD VOUT CPOUT S-8880A Series Step-up DC-DC converter Figure 7 2. VOUT ≤ 3.0 V, CL > CCPOUT × 0.1 VIN CIN VIN CCPOUT VIN OUT VM VSS S-8880A Series VSS CL VVOUT Step-up DC-DC converter CVDD VDD VOUT CPOUT SD1 Figure 8 |
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