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MP8676 Datasheet(PDF) 9 Page - Monolithic Power Systems |
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MP8676 Datasheet(HTML) 9 Page - Monolithic Power Systems |
9 / 10 page MP8676 – 4.5A, 42V, 420KHZ STEP-DOWN WITH SYNCHRONIZABLE GATE DRIVER MP8676 Rev.1.0 www.MonolithicPower.com 9 5/7/2012 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2012 MPS. All Rights Reserved. PCB Layout Guide PCB layout is very important to achieve stable operation. Please follow these guidelines and take Figure3 for references. 1) Keep the path of switching current short and minimize the loop area formed by Input cap, high-side and low-side MOSFETs. 2) Keep the connection of low-side MOSFET between SW pin and input power ground as short and wide as possible. 3) Ensure all feedback connections are short and direct. Place the feedback resistors and compensation components as close to the chip as possible. 4) Route 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. LGATE VCC BST SW IN EN FB C1 Rb R1 C2 L1 PGND SGND 8 76 5 4 3 2 1 GND C3 Top Layer SGND Bottom Layer Figure 3—PCB Layout External Bootstrap Diode An external bootstrap diode may enhance the efficiency of the regulator, the applicable conditions of external BST diode are: VOUT=5V or 3.3V; and Duty cycle is high: D= IN OUT V V >65% In these cases, an external BST diode is recommended from the output of the voltage regulator to BST pin, as shown in Fig.4 MP8676 SW BST C L BST COUT 5V or 3.3V External BST Diode IN4148 Figure 4—Add Optional External Bootstrap Diode to Enhance Efficiency The recommended external BST diode is IN4148, and the BST cap is 0.1~1µF. |
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