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FAN5353 Datasheet(PDF) 2 Page - Fairchild Semiconductor |
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FAN5353 Datasheet(HTML) 2 Page - Fairchild Semiconductor |
2 / 13 page © 2009 Fairchild Semiconductor Corporation www.fairchildsemi.com FAN5353 • Rev. 1.0.2 2 Table 1. Recommended External Components for 3A Maximum Load Current Component Description Vendor Parameter Typ. Units L1 470nH nominal Vishay IHLP1616ABER47M01 CoiltronicsSD12-R47-R TDK VLC5020T-R47N MURATA LQH55PNR47NT0 L 0.47 μH DCR 20 m Ω COUT 2 pieces 10 μF, 6.3V, X5R, 0805 GRM21BR60J106M (Murata) C2012X5R0J106M (TDK) C 10.0 μF CIN 10 μF, 6.3V, X5R, 0805 CIN1 10nF, 25V, X7R, 0402 GRM155R71E103K (Murata) C1005X7R1E103K (TDK) C 10 nF CVCC 4.7 μF, 6.3V, X5R, 0603 GRM188R60J475K (Murata) C1608X5R0J475K (TDK) C 4.7 μF R3 (1) Resistor: 1 Ω 0402 any R 1 Ω Note: 1. R3 is optional and improves IC power supply noise rejection. See Layout recommendations for more information. Pin Configuration FB VOUT PGND PGND SW SW NC PGOOD EN VCC PVIN PVIN 6 5 4 3 2 1 7 8 9 10 11 12 P1 (GND) Figure 2. 12-Pin, 3x3.5mm MLP (Top View) Pin Definitions Pin # Name Description 1 FB FB. Connect to resistor divider. The IC regulates this pin to 0.8V. 2 VOUT VOUT. Sense pin for VOUT. Connect to COUT. 3, 4 PGND Power Ground. Low-side MOSFET is referenced to this pin. CIN and COUT should be returned with a minimal path to these pins. 5, 6 SW Switching Node. Connect to inductor. P1 GND Ground. All signals are referenced to this pin. 7, 8 PVIN Power Input Voltage. Connect to input power source. Connect to CIN with minimal path. 9 VCC IC Bias Supply. Connect to input power source. Use a separate bypass capacitor CVCC from this pin to the P1 GND terminal between pins 1 and 12. 10 EN Enable. The device is in shutdown mode when this pin is LOW. Do not leave this pin floating. 11 PGOOD Power Good. This open-drain pin pulls LOW if the output falls out of regulation or is in soft-start. 12 NC This pin has no function and should be tied to GND. Note: 2. P1 is the bottom heat-sink pad. Ground plane should flow through pins 3, 4, 12, and P1 and can be extended through pin 11 if PGOOD’s function is not required to improve IC cooling. |
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