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S8424A Datasheet(PDF) 22 Page - Seiko Instruments Inc |
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S8424A Datasheet(HTML) 22 Page - Seiko Instruments Inc |
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22 / 46 page  BATTERY BACKUP SWITCHING IC S-8424A Series Rev.3.0_01 22 3.4 Switch Transistor M1 Voltage regulator 2 is also used to switch from VIN pin to VOUT pin. Therefore, no reverse current flows from VOUT pin to VIN pin when voltage regulator 2 is OFF. The output voltage of voltage regulator 2 can be selected from between 2.3 V and 5.4 V in 0.1 V steps. The on-resistance of switch transistor M1 is 60 Ω or lower (IOUT = 10 to 500 μA). Therefore, when M1 is switched ON and VOUT pin is connected to VBAT pin, the voltage drop (Vdif) caused by M1 is 60 × IOUT (output current) at maximum., and VBAT – Vdif (max.) is output to the VOUT pin at minimum. When voltage regulator 2 is ON and M1 is OFF, the leakage current of M1 is kept below 0.1 μA max. (VIN = 6 V, Ta = 25°C) with the VBAT pin grounded (VSS pin). VIN VBAT VOUT M1 Vdif REG2 Figure 9 Definition of V dif |
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