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SC471AEVB Datasheet(PDF) 7 Page - Semtech Corporation |
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SC471AEVB Datasheet(HTML) 7 Page - Semtech Corporation |
7 / 27 page 7 © 2008 Semtech Corp. SC471/SC471A www.semtech.com POWER MANAGEMENT Pin Descriptions Pin Pin Name Pin Function 1 LX Switching (phase) node. 2 BST Boost capacitor connection for high-side gate drive. 3 VCC 5V power input for the internal circuits and gate drive outputs. 4 DL Gate drive output for the low-side external MOSFET. 5 GND Power ground. This is the return point for the DL driver output, and the reference point for the ILIM and zero cross circuits. 6RTN Return or analog ground for the FB input and FB resistor divider . Connect to GND directly at the IC. All feedback components should connect to this ground. 7 D1 Drain of second internal MOSFET which is controlled by G1. 8 D0 Drain of first internal MOSFET which is controlled by G0. 9FB Feedback sense point. The FB threshold is 0.75V; the resistor divider ratio between VOUT and FB sets the output voltage. This ratio can be modified using the G0/G1 inputs to switch resistors in/out at D0/D1. 10 VOUT Output voltage sense point for determining On-Time. 11 PGOOD Open-drain power good indicator - a high impedance indicates power is good - an external pull-up resistor is required. 12 EN Enable input - connect EN to RTN to disable the SC471/A. 13 ILIM Current limit sense point — to program the current limit connect a resistor from ILIM to LX or to a current sense resistor. 14 G0 Control input for the D0 MOSFET. A logic high (low) energizes the D0 MOSFET on the SC471 (SC471A), pulling D0 to ground. 15 G1 Control input for the D1 MOSFET. A logic high (low) energizes the D1 MOSFET on the SC471 (SC471A), pulling D1 to ground. 16 DH Gate drive output for the high-side external MOSFET. TPAD Mounting pad. Not connected internally - connect to system (power) ground plane through prefer- ably one large via or multiple smaller vias. |
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