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MAX1607 Datasheet(PDF) 7 Page - Maxim Integrated Products |
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MAX1607 Datasheet(HTML) 7 Page - Maxim Integrated Products |
7 / 10 page USB Current-Limited Switch in Pin-Compatible Package counter starts. If the load fault persists beyond the 10ms overcurrent-blanking timeout, the OC output asserts low. Ensure that the MAX1607 input is ade- quately bypassed to prevent input glitches from trigger- ing spurious OC outputs. Input voltage glitches less than 150mV will not cause a spurious OC output. Load- transient faults less than 10ms (typ) will not cause an OC output assertion. Only current-limit faults are blanked. Die overtempera- ture faults and input voltage droops below the UVLO threshold will cause an immediate OC output. Applications Information Input Capacitor To limit the input voltage drop during momentary output short-circuit conditions, connect a capacitor from IN to GND. A 1µF ceramic capacitor will be adequate for most applications; however, higher capacitor values will further reduce the voltage drop at the input (Figure 2). Output Capacitor Connect a 0.1µF capacitor from OUT to GND. This capacitor helps to prevent inductive parasitics from pulling OUT negative during turn-off. Layout and Thermal Dissipation Important: Optimize the switch response time to output short-circuit conditions by keeping all traces as short as possible to reduce the effect of undesirable parasitic inductance. Place input and output capacitors as close as possible to the device (no more than 5mm away). All IN and OUT pins must be connected with short traces to the power bus. Wide power-bus planes will provide superior heat dissipation through the MAX1607’s IN and OUT pins. Under normal operating conditions, the package can dissipate and channel heat away. Calculate the maxi- mum power dissipation as follows: P = (ILIMIT)2 ✕ RON where ILIMIT is the preset current limit (1.0A max) and RON is the on-resistance of the switch (125m Ω max). When the output is short circuited, foldback-current lim- iting activates and the voltage drop across the switch equals the input supply. The power dissipated across the switch increases, as does the die temperature. If the fault condition is not removed, the thermal-over- load-protection circuitry activates (see Thermal Shutdown section). Wide power-bus planes connected to IN and OUT and a ground plane in contact with the device will help dissipate additional heat. Figure 2. Typical Application Circuit MAX1607 IN OUTPUT OUT INPUT 1 μF 0.1 μF* *USB SPECIFICATIONS REQUIRE A HIGHER VALUE CAPACITOR. OVERCURRENT OUTPUT ON 100k OFF GND OC EN Chip Information TRANSISTOR COUNT: 715 _______________________________________________________________________________________ 7 Pin Configurations (continued) TOP VIEW 1 2 3 4 5 10 98 7 6 MAX1607 + EP* *EP = EXPOSED PADDLE |
Similar Part No. - MAX1607_07 |
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Similar Description - MAX1607_07 |
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