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SC1454XIMSTR Datasheet(PDF) 7 Page - Semtech Corporation |
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SC1454XIMSTR Datasheet(HTML) 7 Page - Semtech Corporation |
7 / 14 page 7 2005 Semtech Corp. www.semtech.com SC1454 POWER MANAGEMENT impedance allowable to maintain T J ≤ 125°C: This target value can be achieved by using one square inch of board copper connected to the GND pin (pin 3), which connects directly to the device substrate. Increasing this area or the use of multi layer boards will lower the junction temperature and improve overall output voltage accuracy. Layout Considerations While layout for linear devices is generally not as critical as for a switching application, careful attention to detail will ensure reliable operation. 1) Attaching the part to a larger copper footprint will enable better heat transfer from the device, especially on PCBs where there are internal ground and power planes. 2) Place the input, output and bypass capacitors close to the device for optimal transient response and device behaviour. 3) Connect all ground connections directly to the ground plane. If there is no ground plane, connect to a common local ground point before connecting to board ground. R1 and R2 should be selected such that the current flowing through them is ≥ 10µA (thus R2 ≤ 120kΩ). Thermal Considerations The worst-case power dissipation for this part is given by: (1) For all practical purposes, equation (1) can be reduced to the following expression: (2) Looking at a typical application: V IN(MAX) = 4.2V V OUTA = 3V - 2% (worst case) = 2.94V V OUTB = 3.3V - 2% (worst case) = 3.234V I OUTA = IOUTB = 150mA T A = 85°C Inserting these values into equation (2) above gives us: Using this figure, we can calculate the maximum thermal Applications Information (Cont.) () () ) MAX ( Q ) MAX ( IN ) MAX ( OUTB ) MIN ( OUTB ) MAX ( IN ) MAX ( OUTA ) MIN ( OUTA ) MAX ( IN ) MAX ( D I V I V V I V V P • + • − + • − = () () ) MAX ( OUTB ) MIN ( OUTB ) MAX ( IN ) MAX ( OUTA ) MIN ( OUTA ) MAX ( IN ) MAX ( D I V V I V V P • − + • − = () ( ) W 334 . 0 145 . 0 189 . 0 15 . 0 234 . 3 2 . 4 15 . 0 94 . 2 2 . 4 P ) MAX ( D = + = • − + • − = () () W / C 120 334 . 0 85 125 P T T ) MAX ( D ) MAX ( A ) MAX ( J ) MAX ( JA ° = − = − = θ |
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