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AST1S31HF Datasheet(PDF) 4 Page - STMicroelectronics |
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AST1S31HF Datasheet(HTML) 4 Page - STMicroelectronics |
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4 / 33 page  Pin settings AST1S31HF 4/33 DocID026968 Rev 2 1 Pin settings 1.1 Pin connection Figure 2. Pin connection (top view) 1.2 Pin description Table 1. Pin description No. Type Description 1 VINA Unregulated DC input voltage 2EN Enable input. With EN higher than 1.5 V the device in ON and with EN lower than 0.5 V the device is OFF. 3FB Feedback input. Connecting the output voltage directly to this pin the output voltage is regulated at 0.8 V. To have higher regulated voltages an external resistor divider is required from Vout to the FB pin. 4 AGND Ground 5PG Open drain Power Good (POR) pin. It is released (open drain) when the output voltage is higher than 0.92 * VOUT with a delay of 170 s. If the output voltage is below 0.92 * VOUT, the POR pin goes to low impedance immediately. If not used, it can be left floating or to GND. 6 VINSW Power input voltage 7 SW Regulator output switching pin 8 PGND Power ground 9 ePAD Exposed pad connected to ground |
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