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LM2852YMXAX-3.3 Datasheet(PDF) 11 Page - National Semiconductor (TI) |
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LM2852YMXAX-3.3 Datasheet(HTML) 11 Page - National Semiconductor (TI) |
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11 / 13 page  Applications Information (Continued) SPLIT-RAIL OPERATION The LM2852 can be powered using two separate voltages for AVIN and PVIN. AVIN is the supply for the control logic; PVIN is the supply for the power FETs. The output filter components need to be chosen based on the value of PVIN. For PVIN levels lower than 3.3V, use output filter component values recommended for 3.3V. PVIN must always be equal to or less than AVIN. 20127014 Layout Hints These are several guidelines to follow while designing the PCB layout for an LM2852 application. 1. The input bulk capacitor, C IN, should be placed very close to the PVIN pin to keep the resistance as low as possible between the capacitor and the pin. High current levels will be present in this connection. 2. All ground connections must be tied together. Use a broad ground plane, for example a completely filled back plane, to establish the lowest resistance possible be- tween all ground connections. 3. The sense pin connection should be made as close to the load as possible so that the voltage at the load is the expected regulated value. The sense line should not run too close to nodes with high EMI (such as the switch node) to minimize interference. 4. The switch node connections should be low resistance to reduce power losses. Low resistance means the trace between the switch pin and the inductor should be wide. However, the area of the switch node should not be too large since EMI increases with greater area. So connect the inductor to the switch pin with a short, but wide trace. Other high current connections in the application such as PVIN and V OUT assume the same trade off between low resistance and EMI. 5. Allow area under the chip to solder the entire exposed die attach pad to ground. Lab measurements show im- proved regulation performance when the exposed pad is well grounded. LM2852Y Example Circuit Schematic (500kHz) Bill of Materials for 3.3V IN to 1.8 VOUT Conversion ID Part Number Type Size Parameters Qty Vendor U 1 LM2852YMXA-1.8 2A Buck ETSSOP-14 1 NSC L O DO3316P-153 Inductor 15 µH 1 Coilcraft C O* 595D107X_6R3C2T Capacitor Case Code “C” 100 µF ±20% 1 Vishay-Sprague C IN GRM32ER60J476ME20B Capacitor 1210 47µF/X5R/6.3V 1 Murata C INX GRM21BR71C105KA01B Capacitor 0805 1µF/X7R/16V 1 Murata C SS VJ0805Y272KXXA Capacitor 0805 2.7nF ±10% 1 Vishay-Vitramon R f CRCW060310R0F Resistor 0603 10 Ω ±10% 1 Vishay-Dale C f GRM21BR71C105KA01B Capacitor 0805 1µF/X7R/16V 1 Murata * If a “non-tantalum” solution is desired use an NOSC107M004R0150, 100 µF capacitor from AVX for CO. 20127020 FIGURE 1. www.national.com 11 |
Similar Part No. - LM2852YMXAX-3.3 |
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Similar Description - LM2852YMXAX-3.3 |
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