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S-19244E33H-V5T2U Datasheet(PDF) 27 Page - ABLIC Inc. |
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S-19244E33H-V5T2U Datasheet(HTML) 27 Page - ABLIC Inc. |
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27 / 68 page  AUTOMOTIVE, 105°C OPERATION, 10 V INPUT, 1000 mA VOLTAGE REGULATOR WITH SOFT-START FUNCTION Rev.3.2_00 S-19244xxxH Series 27 3. ON / OFF pin The ON / OFF pin controls the internal circuit and the output transistor in order to start and stop the regulator. When the ON / OFF pin is set to OFF, the internal circuit stops operating and the output transistor between the VIN pin and the VOUT pin is turned off, reducing current consumption significantly. Note that the current consumption increases when a voltage of 0.6 V to VIN − 0.3 V is applied to the ON / OFF pin. The ON / OFF pin is configured as shown in Figure 29 and Figure 30. 3. 1 S-19244xxxH Series A / C / E / G type Since the ON / OFF pin is internally pulled down to the VSS pin in the floating status, the VOUT pin is set to the VSS level. Refer to " Electrical Characteristics" for the ON / OFF pin current. 3. 2 S-19244xxxH Series B / D / F / H type Since the ON / OFF pin is neither pulled down nor pulled up, do not use these types in the floating status. When not using the ON / OFF pin, connect it to the VIN pin. Table 26 Product Type ON / OFF Pin Internal Circuit VOUT Pin Voltage Current Consumption A / B / C / D E / F / G / H "H" : ON Operate Constant value *1 ISS1 *2 A / B / C / D E / F / G / H "L" : OFF Stop Pulled down to VSS *3 ISS2 *1. The constant value is output due to the regulating based on the set output voltage value. *2. Note that the IC's current consumption increases as much as current flows into the pull-down resistor when the ON / OFF pin is connected to the VIN pin and the S-19244xxxH Series A / C / E / G type is operating (refer to Figure 29). *3. The VOUT pin voltage of the S-19244xxxH Series A / B / E / F type is pulled down to VSS due to the discharge shunt circuit (RLOW = 100 Ω typ.), the feedback resistors (Rs and Rf) and a load. VSS VIN ON / OFF VSS VIN ON / OFF Figure 29 S-19244xxxH Series A / C / E / G type Figure 30 S-19244xxxH Series B / D / F / H type |
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