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IRF7821 Datasheet(PDF) 16 Page - Richtek Technology Corporation |
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IRF7821 Datasheet(HTML) 16 Page - Richtek Technology Corporation |
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16 / 18 page  16 DS8298-01 November 2011 www.richtek.com RT8298 Copyright 2011 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation. © Figure 9. PCB Layout Guide for SOP-8 (Exposed Pad) Figure 10. PCB Layout Guide for WDFN-14L 4x3 VOUT GND VOUT Q1 R1 R2 SW BOOT VCC BG VIN EN/SYNC GND FB GND 2 3 4 5 6 7 8 9 CIN CBOOT GND L COUT The feedback components must be connected as close to the device as possible. Input capacitor must be placed as close to the IC as possible. SW should be connected to inductor by wide and short trace. Keep sensitive components away from this trace. The EN/SYNC must be kept away from noise. The trace should be short and shielded with a ground trace. CVCC BG GND CVCC capacitor must be placed as close to the IC as possible. VIN VCC GND R1 R2 CBOOT L VOUT COUT VOUT GND CIN GND R3 The feedback components must be connected as close to the device as possible. Input capacitor must be placed as close to the IC as possible. SW should be connected to inductor by wide and short trace. Keep sensitive components away from this trace. The EN/SYNC must be kept away from noise. The trace should be short and shielded with a ground trace. FB PGOOD VIN VIN GND BG VCC SW BOOT EN/SYNC VIN SW NC SW 13 12 11 1 2 3 4 5 14 69 10 GND 15 78 BG CVCC capacitor must be placed as close to the IC as possible. CVCC Q1 VIN |
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