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ILC7083AIM550X Datasheet(PDF) 10 Page - Fairchild Semiconductor |
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ILC7083AIM550X Datasheet(HTML) 10 Page - Fairchild Semiconductor |
10 / 16 page ILC7083/ILC7084 10 REV. 1.0.9 1/28/03 Evaluation Board Parts List (for Figure 9) Label Part Number Manufacturer Description U1 ILC7083AIM5-30 Fairchild Semiconductor 150mA RF LDO™ regulator J1 69190-405 Berg Connector, four position header Cin GRM40 Y5V 105Z16 muRata Ceramic capacitor, 1 µF,16V, SMT (size 0805) Cnoise ECU-V1H103KBV Panasonic Ceramic capacitor, 0.01 µF,16V, SMT (size 0603) Cout GRM42-6X5R475K10 muRata Ceramic capacitor, 4.7 µF,16V, SMT (size 1206) Grounding Recommendations 1. Connect CIN between VIN of the ILC7083 and the “GROUND PLANE”. 2. Keep the ground side of COUT and CNOISE connected to the “LOCAL GROUND” and not directly to the “GROUND PLANE”. 3. On multilayer boards use component side copper for grounding around the ILC7083 and connect back to a “GROUND PLANE” using vias. 4. If using a DC-DC converter in your design, use a star grounding system with separate traces for the power ground and the control signals. The star should radiate from where the power supply enters the PCB. Layout Considerations 1. Place all RF LDO related components; ILC7083, input capacitor CIN, noise bypass capacitor CNOISE and output capacitor COUT as close together as possible. 2. Keep the output capacitor COUT as close to the ILC7083 as possible with very short traces to the VOUT and GND pins. 3. The traces for the related components; ILC7083, input capacitor CIN, noise bypass capacitor CNOISE and output capacitor COUT can be run with minimum trace widths close to the LDO. 4. Maintain a separate “LOCAL GROUND” remote from the “GROUND PLANE” to ensure a quiet ground near the LDO. Figure 9 shows how this circuit can be translated into a PCB layout. Recommended Ceramic Output Capacitors COUT Capacitor Size IOUT Dielectric Part Number Capacitor Vendor 1 µF 0805 0 to 150mA X5R C2012X5R1A105KT TDK 0805 X7R GRM40X7R105K010 muRata 0805 X7R LMK212BJ105KG Taiyo-Yuden 1206 X7R GRM42-6X7R105K016 muRata 1206 X7R EMK316BJ105KL Taiyo-Yuden 1206 X5R TMK316BJ105KL Taiyo-Yuden 2.2 µF 0805 0 to 150mA X5R GRM40X5R225K 6.3 muRata 0805 X5R C2012X5R0J225KT TDK 1206 X5R EMK316BJ225ML Taiyo-Yuden 4.7 µF 1206 0 to 150mA X5R GRM42-6X5R475K010 muRata 1206 X7R LMK316BJ475ML Taiyo-Yuden |
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