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LTC1174HVCS8 Datasheet(PDF) 11 Page - Linear Technology |
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LTC1174HVCS8 Datasheet(HTML) 11 Page - Linear Technology |
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11 / 20 page  11 LTC1174 LTC1174-3.3/LTC1174-5 1174fe Figure 7. LTC1174 Layout Diagram (See Board Layout Checklist) APPLICATIO S I FOR ATIO Board Layout Checklist When laying out the printed circuit board, the following checklist should be used to ensure proper operation of the LTC1174. These items are also illustrated graphically in the layout diagram in Figure 7. Check the following in your layout: 1. Is the Schottky catch diode closely connected between ground (Pin 4) and switch (Pin 5)? 2. Is the “+” plate of CIN closely connected to VIN (Pin 6)? This capacitor provides the AC current to the internal P-channel MOSFET. 3. Is the 0.1 µF VIN decoupling capacitor closely conected between VIN (Pin 6) and ground (Pin 4)? This capacitor carries the high frequency peak currents. 4. Is the SHUTDOWN (Pin 8) actively pulled to VIN during normal operation? The SHUTDOWN pin is high imped- ance and must not be allowed to float. 5. Is the IPGM (Pin 7) pulled either to VIN or ground? The IPGM pin is high impedance and must not be allowed to float. 3 LTC1174 2 SW R1 8 7 6 1 5 4 L VOUT D 1174 F07 OUTPUT DIVIDER REQUIRED WITH ADJUSTABLE VERSION ONLY 0.1 µF LBOUT LBIN GND SHUTDOWN IPGM VIN R2 BOLD LINES INDICATE HIGH CURRENT PATH VIN CIN COUT VOUT (VFB) + DESIGN EXAMPLE As a design example, assume VIN = 9V (nominal), VOUT = 5V, and IOUT = 350mA maximum. The LTC1174-5 is used for this application, with IPGM (Pin 7) connected to VIN. The minmum value of L is determined by assuming the LTC1174-5 is operating in continuous mode. Figure 8. Continuous Inductor Current TIME IPEAK IV AVG CURRENT = IOUT = = 350mA IPEAK + IV 2 1174 F08 With IOUT = 350mA and IPEAK = 0.6A (IPGM = VIN), IV = 0.1A.The peak-to-peak ripple inductor current, IRIPPLE, is 0.5A and is also equal to: I VV L A RIPPLE OUT D PP = + ⎛ ⎝⎜ ⎞ ⎠⎟ () − − 410 6 • |
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