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SC173A Datasheet(PDF) 6 Page - Semtech Corporation |
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SC173A Datasheet(HTML) 6 Page - Semtech Corporation |
6 / 26 page © 2010 Semtech Corporation Pin Descriptions (MLPD-10) Pin # Pin Name Pin Function 1 BST Bootstrap pin. A capacitor is connected between BST to LX to develop the floating voltage for the high-side gate drive. 2 VIN Power input supply voltage. 3 LX Switching (Phase) node. 4 PGND Power ground. 5 PGOOD Open-drain Power Good indicator. High impedance indicates power is good. An external pull-up resistor is required. 6 FB Feedback input for switching regulator. Connect to an external resistor divider from the output to program the output voltage. 7 EN Enable input for the switching regulator. Pull EN above 1V or float it to enable the part with auto- matic power save mode enabled. Connect EN to AGND to disable the switching regulator. 8 TON On-time set input. Set the on-time by a series resistor to AGND. 9 AGND Analog Ground. 10 VDD Input power for internal control circuit. Needs at least 2.2mF decoupling capacitor from this pin to AGND. PAD Thermal pad for heatsinking purposes. Connect to ground plane using multiple vias. Not con- nected internally. 6 SC173A |
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