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LTC4440ES6 Datasheet(PDF) 9 Page - Linear Technology |
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LTC4440ES6 Datasheet(HTML) 9 Page - Linear Technology |
9 / 12 page 9 LTC4440 4440i Bypassing and Grounding The LTC4440 requires proper bypassing on the VCC and VBOOST–TS supplies due to its high speed switching (nano- seconds) and large AC currents (Amperes). Careless component placement and PCB trace routing may cause excessive ringing and under/overshoot. To obtain the optimum performance from the LTC4440: A. Mount the bypass capacitors as close as possible between the VCC and GND pins and the BOOST and TS pins. The leads should be shortened as much as pos- sible to reduce lead inductance. B. Use a low inductance, low impedance ground plane to reduce any ground drop and stray capacitance. Re- member that the LTC4440 switches >2A peak currents and any significant ground drop will degrade signal integrity. APPLICATIO S I FOR ATIO C. Plan the power/ground routing carefully. Know where the large load switching current is coming from and going to. Maintain separate ground return paths for the input pin and the output power stage. D. Keep the copper trace between the driver output pin and the load short and wide. E. When using the MS8E package, be sure to solder the exposed pad on the back side of the LTC4440 package to the board. Correctly soldered to a 2500mm2 double- sided 1oz copper board, the LTC4440 has a thermal resistance of approximately 40 °C/W. Failure to make good thermal contact between the exposed back side and the copper board will result in thermal resistances far greater than 40 °C/W. |
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