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SC171EVB Datasheet(PDF) 6 Page - Semtech Corporation |
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SC171EVB Datasheet(HTML) 6 Page - Semtech Corporation |
6 / 27 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/PSV Tri-state pin. Enable input for switching regulator. Pull EN/PSV high to enable the part with power save mode enabled. Connect EN/PSV to AGND to disable the switching regulator. Leave EN/PSV floating to enable the IC in forced continuous conduction mode. 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 1mF 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 SC171 |
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