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ELM613DA Datasheet(PDF) 8 Page - ELM Technology Corporation |
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ELM613DA Datasheet(HTML) 8 Page - ELM Technology Corporation |
8 / 11 page 8 Rev.1.3 11 - 9. PCB layout guide PCB layout is very important to achieve stable operation. Please follow the guidelines below. 1) Keep the path of switching current short and minimize the loop area formed by Input capacitor, high-side MOSFET and low-side MOSFET. 2) Bypass ceramic capacitors are suggested to be put close to the VIN Pin. 3) Ensure all feedback connections are short and direct. Place the feedback resistors and compensation components as close to the chip as possible. 4) Rout SW away from sensitive analog areas such as FB. 5) Connect IN, SW, and especially GND respectively to a large copper area to cool the chip to improve thermal performance and long-term reliability. SOP-8 ■Marking LV1482SN a b c d e f g h i j k Mark Content LV1482SN Product ID a to k Assembly lot No.: 0 to 9 & A to Z repeated ELM613DA 2A, 20V, 550kHz, synchronous step-down DC/DC converter L R1 R2 R3 Cout C1 Vout=5.0V 10µH 15K 15K 6.8K 16K 22µF 3.3nF Vout=3.3V 10µH 12K 100 4.7K 15K 22µF 3.3nF Vout=2.5V 10µH 9.1K 470 5.6K 13K 22µF 3.3nF Vout=1.8V 10µH 6.8K 1K 8.2K 6.8K 22µF 3.3nF Vout=1.2V 4.7µH 1.5K 1.5K 10K 5.1K 22µF 3.3nF Vout=1.0V 3.3µH 1K 1K 24K 4.7K 22µF 3.3nF Table2 : BOM of ELM613DA when Vin≤ 6V, for the purpose of promote the efficiency, it can add an external Schottky diode between IN and BS pins, as shown in Figure 2. SW BS GND VIN ELM613DA Schottky (B0520LW) 5V to 6V Vout ▲ Figure 2: Add a Schottky diode to promote efficiency when Vin ≤ 6V. |
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