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AAT4601IHS-T1 Datasheet(PDF) 8 Page - Advanced Analogic Technologies |
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AAT4601IHS-T1 Datasheet(HTML) 8 Page - Advanced Analogic Technologies |
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8 / 14 page  Applications Information Setting Current Limit A simple three-step procedure can be used to adjust the AAT4601's current limit. First, the maxi- mum current required by the load should be deter- mined. Second, select a resistor that guarantees adequate current is available to the load under nor- mal conditions. Finally, the maximum current that can pass through the switch can be calculated and compared to the maximum current available. Step 1: The maximum current required by a load is usually defined in port specifications design application references. For example, USB ports are specified to support loads of up to 500 mA. Step 2: The most convenient method for deter- mining a current limit resistor value is to look it up in the provided table named "Current Limit RSET Values". Find the lowest current value that is greater than the maximum load current in the given application. Refer to the column named "Device will not current limit below". The resistor value needed is in the corresponding row named "RSET". For example, a USB port requires 500 mA. The lowest level where the device will current limit above 500 mA is 516 mA. The corresponding resistor value for RSET would be 2kΩ . Step 3: Now the required resistor value has been determined. The maximum current that can be drawn, even with a short circuit applied to the out- put, can be determined by reading the column labeled "Device always current limits below". If the power supply connected to the AAT4601's input can provide this current level, the power supply voltage will not collapse when a short circuit is applied to the load switch output. For example, a notebook com- puter has a USB port which is powered by an AAT4601 with a 2k Ω resistor connected between the SET pin and GND. If the power supply con- nected to the AAT4601's IN pin can provide more than 917 mA, this supply will remain in regulation even if a short circuit is applied to the USB port. Current Limit RSET Values AAT4601 1.5A Current Limited P-Channel Switch 8 4601.2001.11.0.92 RSET Current Device will Device always ( Ω) Limit typ not current current limits (mA) limit below: below: (mA) (mA) 470 1585 1141 2029 510 1529 1101 1957 560 1466 1055 1876 620 1397 1006 1788 680 1334 960 1707 750 1266 911 1620 820 1206 869 1544 910 1144 823 1464 1000 1089 784 1394 1100 1034 745 1324 1200 986 710 1262 1300 941 677 1204 1500 865 623 1107 1600 829 597 1061 1800 769 554 985 2000 716 516 917 2200 673 485 861 2400 633 456 811 2700 582 419 745 3000 539 388 690 3300 502 362 643 3600 470 339 602 3900 442 318 565 4300 410 295 524 4700 382 275 489 5100 358 258 458 5600 332 239 424 6200 306 220 392 6800 283 204 362 7500 268 193 343 |
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