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Si7114 Datasheet(PDF) 3 Page - Richtek Technology Corporation |
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Si7114 Datasheet(HTML) 3 Page - Richtek Technology Corporation |
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3 / 18 page  3 DS8298-01 November 2011 www.richtek.com RT8298 Copyright 2011 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation. © Functional Pin Description Pin No. WDFN-14L 4x3 SOP-8 (Exposed Pad) Pin Name Pin Function 1 6 FB Feedback Input. This pin is connected to the converter output. It is used to set the output of the converter to regulate to the desired value via an external resistive divider. The feedback reference voltage is 0.808V typically. 2 -- PGOOD Power Good Indicator with Open Drain. (for RT8298ZQW only) A 100k Ω pull-high resistor is needed. The output of this pin is pulled to low when the FB is lower than 0.75V; otherwise it is high impedance. 3 7 EN/SYNC Enable or External Frequency Synchronization Input. A logic-high (2V < EN < 5.5V) enables the converter; a logic-low forces the IC into shutdown mode reducing the supply current to less than 3 μA. For external frequency synchronization operation, the available frequency range is from 300kHz to 1.5MHz. 4, 5, 6 8 VIN Power Input. The available input voltage range is from 4.5V to 24V. A 22 μF or larger input capacitor is needed to reduce voltage spikes at the input. 7 -- NC No Internal Connection. 8, 9, 10 1 SW Switching Node. Output of the internal high side MOSFET. Connect this pin to external low-side N-MOSFET, inductor and bootstrap capacitor. 11 2 BOOT Bootstrap for High side Gate Driver. Connect a 1 μF ceramic capacitor between the BOOT pin and SW pin. 12 3 VCC BG Driver Bias Supply. Decouple with a 1 μF X5R/X7R ceramic capacitor between the VCC pin and GND. 13 4 BG Gate Driver Output. Connect this pin to the gate of the external low-side N-MOSFET. 14, 15 (Exposed Pad) 5, 9 (Exposed Pad) GND Ground. The exposed pad must be soldered to a large PCB and connected to GND for maximum thermal dissipation. |
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