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MP2235 Datasheet(PDF) 17 Page - Monolithic Power Systems |
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MP2235 Datasheet(HTML) 17 Page - Monolithic Power Systems |
17 / 21 page MP2235 – SYNCHRONOUS STEP-DOWN CONVERTER MP2235 Rev. 1.0 www.MonolithicPower.com 17 5/16/2013 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2013 MPS. All Rights Reserved. PC Board Layout (8) PCB layout is very important to achieve stable operation especially for VCC capacitor and input capacitor placement. For best results, follow these guidelines: 1. Use large ground plane directly connect to GND pin. Add vias near the GND pin if bottom layer is ground plane. 2. Place the VCC capacitor to VCC pin and GND pin as close as possible. Make the trace length of VCC pin-VCC capacitor anode-VCC capacitor cathode-chip GND pin as short as possible. 3. Place the ceramic input capacitor close to IN and GND pins. Keep the connection of input capacitor and IN pin as short and wide as possible. 4. Route SW, BST away from sensitive analog areas such as FB. It’s not recommended to route SW, BST trace under chip’s bottom side. 5. Place the T-type feedback resistor R5 close to chip to ensure the trace which connects to FB pin as short as possible Notes: 8) The recommended layout is based on the Figure 8 Typical Application circuit on the next page. L1 C2 C1 C1A R4 C4 C6 Vin GND Vout SW GND GND SW EN/SYNC BST GND VOUT C2A L1 C2 C1 C1A R4 C4 C6 Vin GND Vout SW GND GND SW EN/SYNC BST GND VOUT C2A Design Example Below is a design example following the application guidelines for the specifications: Table 2: Design Example VIN 12V VOUT 3.3V Io 3A The detailed application schematic is shown in Figure 10. The typical performance and circuit waveforms have been shown in the Typical Performance Characteristics section. For more device applications, please refer to the related Evaluation Board Datasheets. |
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