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SLG46127 数据表(PDF) 66 Page - Dialog Semiconductor |
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SLG46127 数据表(HTML) 66 Page - Dialog Semiconductor |
66 / 88 page 000-0046127-101 Page 65 of 87 SLG46127 18.0 Dual, 2A P-FET Power Switches 18.1 Power Switches Overview The SLG46127 has a dual-channel, 44 m PMOS power switch designed to switch 1.71 to 5.5 V power rails up to 2 A per channel. Each P-FET Power Switch can be controlled internally via the ONx digital input of the P-FET Power Switch component in GreenPAK Designer, allowing the user to generate integrated mixed-signal control circuits, or externally via PWR_SW_ONx. Whether controlled externally or internally, a low signal on either ONx or PWR_SW_ONx will close the P-FET Power Switch. Each P-FET Power Switch need not be used in the same voltage domain as VDD. However, when VIN is not tied to VDD, using a large pull-up resistor on PWR_SW_ON0 and PWR_SW_ON1 is recommended to prevent current from flowing through the P-FET Power Switch while the device is not powered. 18.2 Power Dissipation The junction temperature of the Power Switch depends on factors such as board layout, ambient temperature, external air flow over the package, load current, and the RDSON-generated voltage drop across each power MOSFET. While the primary contrib- utor to the increase in the junction temperature of the Power Switch is the power dissipation of its power MOSFETs, its power dissipation and the junction temperature in nominal operating mode can be calculated using the following equations: where: PDTOTAL = Total package power dissipation, in Watts (W) RDSON = Channel 0 and Channel 1 Power MOSFET ON resistance, in Ohms (), respectively IOUT = Channel 0 and Channel 1 Output current, in Amps (A), respectively and where: TJ = Die junction temperature, in Celsius degrees (°C) Figure 46. Dual P-FET Power Switch VIN0 VOUT0 SW Open SW Closed AGND VIN1 VOUT1 SW Open SW Closed ILOAD0 ILOAD1 200 200 Control Selection Logic PWR_SW_ON0 ON0 Control Selection Logic PWR_SW_ON1 ON1 PDTOTAL = (RDSON0 x IOUT02) + (RDSON1 x IOUT12) TJ= PDTOTAL x JA + TA |
类似零件编号 - SLG46127 |
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类似说明 - SLG46127 |
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