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SC2612AMSTR Datasheet(PDF) 9 Page - Semtech Corporation |
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SC2612AMSTR Datasheet(HTML) 9 Page - Semtech Corporation |
9 / 12 page 9 2003 Semtech Corp. www.semtech.com POWER MANAGEMENT SC2612A/C Layout Guidelines (Cont.) 4) The Output Capacitor(s) (Cout) should be located as close to the load as possible, fast transient load cur- rents are supplied by Cout only, and connections between Cout and the load must be short, wide copper areas to minimize inductance and resistance. 5) The SC2612 is best placed over a quiet ground plane area, avoid pulse currents in the Cin, Q1, Q2 loop flowing in this area. PGNDH and PGNDL should be returned to the ground plane close to the package. The AGND pin should be connected to the ground side of (one of) the output capacitor(s). If this is not possible, the AGND pin may be connected to the ground path between the Out- put Capacitor(s) and the Cin, Q1, Q2 loop. Under no cir- cumstances should AGND be returned to a ground in- side the Cin, Q1, Q2 loop. 6) Vcc for the SC2612 should be supplied from the 5V supply through a 10 Ω resistor, the Vcc pin should be decoupled directly to AGND by a 0.1 µF ceramic capaci- tor, trace lengths should be as short as possible. Vout Vin + + Currents in Power Section |
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