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S-818A30AUC-BGK-T2 Datasheet(PDF) 7 Page - Seiko Instruments Inc |
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S-818A30AUC-BGK-T2 Datasheet(HTML) 7 Page - Seiko Instruments Inc |
7 / 23 page Rev.1.2 LOW DROPOUT CMOS VOLTAGE REGULATOR S-818 Series Seiko Instruments Inc. 7 Operation 1. Basic operation Figure 7 shows the block diagram of the S-818 Series. The error amplifier compares a reference voltage VREF with the part of the output voltage divided by the feedback resistors Rs and Rf. It supplies the output transistor with the gate voltage, necessary to ensure certain output voltage free of any fluctuations of input voltage and temperature. 2. Output transistor The S-818 Series uses a low on-resistance Pch MOS FET as the output transistor. Be sure that VOUT does not exceed VIN+0.3 V to prevent the voltage regulator from being broken due to inverse current flowing from VOUT pin to VIN pin through the parasitic diode. 3. Power Off Pin (ON/OFF Pin) This pin activates and inactivates the regulator. When the ON/OFF pin is switched to the power off level, the operation of all internal circuit stops, the built-in Pch MOSFET output transistor between VIN and VOUT pin is switched off, suppressing current consumption. The VOUT pin goes to the Vss level due to internal divided resistance of several M Ω between VOUT pin and VSS pin. The structure of the ON/OFF pin is shown in Figure 8. Since the ON/OFF pin is neither pulled down nor pulled up internally, do not keep it in the floating state. Current consumption increases if a voltage of 0.3 V to VIN-0.3 V is applied to the ON/OFF pin. When the power off pin is not used, connect it to the VIN pin for product type "A" and to the VSS pin for product type "B". Table 6 Power off pin function by product type Product type ON/OFF pin Internal circuit VOUT pin voltage Current consumption A “H” : Power on Operating Set value Iss1 A “L” : Power off Stop VSS level Iss2 B “H” : Power off Stop VSS level Iss2 B “L” : Power on Operating Set value Iss1 Reference voltage circuit VOUT *1 *1 Parasitic diode VSS VIN Rs Rf Error amplifier Current source Vref ON/OFF VIN VSS Figure 8 ON/OFF Pin Figure 7 Typical Circuit Block Diagram |
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