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BL3406B-2.5V Datasheet(PDF) 9 Page - SHANGHAI BELLING CO., LTD. |
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BL3406B-2.5V Datasheet(HTML) 9 Page - SHANGHAI BELLING CO., LTD. |
9 / 11 page PPMIC BU www.belling.com.cn BL3406B Rev 1.5 Belling Proprietary Information. Unauthorized Photocopy and Duplication Prohibited 10/2009 ©2009 Belling All Rights Reserved 9 BL3406B 1.5 MHz, 800mA Synchronous Buck Converter frequency. Ceramic capacitors with X5R or X7R dielectrics are recommended due to their low ESR and high ripple current. The output ripple ∆VOUT is determined by: × × + × × × − × ≤ ∆ 2 8 1 ) ( C f ESR L f V V V V V OSC OSC IN OUT IN OUT OUT Layout Considerations When laying out the printed circuit board, the following checklist should be used to ensure proper operation of the BL3406B. These items are also illustrated graphically in Figures 5 and 6. Check the following in your layout: 1. The power traces, consisting of the GND trace, the SW trace and the VIN trace should be kept short, direct and wide. 2. Does the VFB pin connect directly to the feedback resistors? The resistive divider R1/R2 must be connected between the (+) plate of Cout and ground. 3. Does the (+) plate of CIN connect to VIN as closely as possible? This capacitor provides the AC current to the internal power MOSFETS. 4. Keep the switching node, SW, away from the sensitive VFB node. 5. Keep the (-) plates of CIN and COUT as close as possible. Figure 3. BL3406B-ADJ Layout Circuit Figure 4. BL3406B-1.8 Layout Circuit Figure 5. BL3406B-ADJ Suggested Layout Figure 6. BL3406B-1.8 Suggested Layout Run GND SW V IN V FB BL3406B-ADJ 4 1 2 3 5 L1 2.2 H C3 10uF C2 22pF R2 200k R1 100k V OUT1.8V VIN 2.7V - 4.2V C1 4.7uF Run GND SW V IN V OUT BL3406B-18 4 1 2 3 5 L1 2.2 H C2 10uF V OUT1.8V VIN 2.7V - 4.2V C1 4.7uF |
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