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MCP1640T-IMC Datasheet(PDF) 17 Page - Microchip Technology |
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MCP1640T-IMC Datasheet(HTML) 17 Page - Microchip Technology |
17 / 32 page 2010-2015 Microchip Technology Inc. DS20002234D-page 17 MCP1640/B/C/D 5.6 Thermal Calculations The MCP1640/B/C/D is available in two different packages: 6-Lead SOT-23 and 8-Lead 2 x 3 DFN. The junction temperature is estimated by calculating the power dissipation and applying the package thermal resistance ( JA). The maximum continuous junction temperature rating for the MCP1640/B/C/D is +125°C. To quickly estimate the internal power dissipation for the switching boost regulator, an empirical calculation using measured efficiency can be used. Given the measured efficiency, the internal power dissipation is estimated by Equation 5-3. EQUATION 5-3: The difference between the first term – input power, and the second term – power delivered, is the internal MCP1640/B/C/D power dissipation. This is an estimate, assuming that most of the power lost is internal to the MCP1640/B/C/D and not CIN, COUT and the inductor. There is some percentage of power lost in the boost inductor, with very little loss in the input and output capacitors. For a more accurate estimation of internal power dissipation, subtract the IINRMS 2 xL ESR power dissipation. 5.7 PCB Layout Information Good printed circuit board layout techniques are important to any switching circuitry, and switching power supplies are no different. When wiring the switching high-current paths, short and wide traces should be used. Therefore, it is important that the input and output capacitors be placed as close as possible to the MCP1640/B/C/D to minimize the loop area. The feedback resistors and feedback signal should be routed away from the switching node and the switching current loop. When possible, ground planes and traces should be used to help shield the feedback signal and minimize noise and magnetic interference. FIGURE 5-1: MCP1640/B/C/D SOT-23-6 Recommended Layout. V OUT I OUT Efficiency ------------------------------------- V OUT I OUT – P Dis = COUT L CIN +VIN GND GND +VOUT Via to GND Plane MCP1640 Via for Enable RTOP RBOT 1 |
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