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NCP148AFCT255T2G Datasheet(PDF) 11 Page - ON Semiconductor |
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NCP148AFCT255T2G Datasheet(HTML) 11 Page - ON Semiconductor |
11 / 12 page NCP148 www.onsemi.com 11 configuration on the PCB, the board material, and the ambient temperature affect the rate of junction temperature rise for the part. The maximum power dissipation the NCP148 can handle is given by: P D(MAX) + 125oC * T A q JA (eq. 1) The power dissipated by the NCP148 for given application conditions can be calculated from the following equations: P D [ VIN @ IGND ) IOUT VIN * VOUT (eq. 2) Figure 38. qJA and PD (MAX) vs. Copper Area (CSP4) 0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 80 90 100 110 120 130 140 150 160 0 100 200 300 400 500 600 700 PCB COPPER AREA (mm2) qJA, 2 oz Cu qJA, 1 oz Cu PD(MAX), TA = 25°C, 1 oz Cu PD(MAX), TA = 25°C, 2 oz Cu Reverse Current The PMOS pass transistor has an inherent body diode which will be forward biased in the case that VOUT > VIN. Due to this fact in cases, where the extended reverse current condition can be anticipated the device may require additional external protection. Power Supply Rejection Ratio The NCP148 features very high Power Supply Rejection ratio. If desired the PSRR at higher frequencies in the range 100 kHz – 10 MHz can be tuned by the selection of COUT capacitor and proper PCB layout. PCB Layout Recommendations To obtain good transient performance and good regulation characteristics place CIN and COUT capacitors close to the device pins and make the PCB traces wide. In order to minimize the solution size, use 0402 or 0201 capacitors with appropriate capacity. Larger copper area connected to the pins will also improve the device thermal resistance. The actual power dissipation can be calculated from the equation above (Equation 2). Expose pad can be tied to the GND pin for improvement power dissipation and lower device temperature. ORDERING INFORMATION Device Nominal Output Voltage Description Marking Rotation Package Shipping NCP148AFCT180T2G 1.8 V 450 mA, Active Discharge T 270 ° 567JZ 5000 / Tape & Reel NCP148AFCT250T2G 2.5 V V 0 ° NCP148AFCT255T2G 2.55 V 4 180 ° NCP148AFCT260T2G 2.6 V V 90 ° NCP148AFCT270T2G 2.7 V Y 0 ° NCP148AFCT280T2G 2.8 V 6 0 ° |
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