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ISL61853IIRZ Datasheet(PDF) 9 Page - Intersil Corporation |
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ISL61853IIRZ Datasheet(HTML) 9 Page - Intersil Corporation |
9 / 20 page ISL6185 9 FN6937.0 October 22, 2010 Introduction The ISL6185 is a dual channel fully independent overcurrent (OC) fault protection IC for the +2.5V to +5V environment. Each ISL6185 incorporates in a single package two 85mΩ P-channel MOSFET power switches for power control. Independent enabling inputs and fault reporting outputs compatible with 2.5V to 5V logic allows for external control and reporting. This device features integrated power switches with current monitoring, accurate current limiting, reverse bias protection and current limited timed delay to turn-off for system reliability. See Figures 11 through 26 for typical operational waveforms including both under and overcurrent situations. The ISL6185 offers current sense and limiting with VIN = 5V guaranteed continuous current product variants of 0.6A, 1.1A, 1.5A and 1.8A making these devices well suited for a myriad of USB and other low power (9W max) port power management applications and configurations. The ISL6185 also provides a thermally insensitive timed OC turn-off and fault notification, isolating and protecting the voltage bus in the event of a peripheral OC event or short circuit event independent of the adjoining switch’s electrical or the ambient thermal condition. The ISL6185 undervoltage lockout feature prevents turn-on of the outputs unless the correct ENABLE state and VIN > VUVLO are present. During initial turn-on the ISL6185 prevents fault reporting by blanking the fault signal. During operation, once an OC condition is detected the output is current limited for tCL to allow transient OC conditions to pass. If still in current limit after the current limit period has elapsed, the output is then turned off and the fault is reported by pulling the corresponding FAULT output low. On the latch off options, after turn-off both the output and the FAULT signal are latched low until reset by the enable signal being de-asserted or a POR occurs at which time the FAULT signal will clear and the switch is ready to be turned back on. On the auto restart options the ISL6185 will attempt to periodically turn-on the output as long as the enable is asserted. When disabled the ISL6185 has a low quiescent supply current and output to input reverse current flow blocking capability. The ISL6185 family is provided with enable polarity options and an industry standard 8 lead SOIC pinout along with two versions in the 70% smaller 3x3 DFN. The 8 Ld DFN package offers the same performance as the 8 Ld SOIC whereas the 10 Ld DFN offers higher current capability in the smallest possible package because of lower package electrical and thermal resistance. Functional Description Power On Preset (POR) The ISL6185 POR feature inhibits device functionality when VIN <VUVLO. Reverse Polarity Protection In any event where the power switch is disabled and VOUT > VIN there will be no output to input current flow nor will the output voltage appear on the input. Soft-Start Upon enable, the switch passes a constant current to the load. The voltage on the VOUT pin will ramp up according the equation: ILIM/COUT (V/s). Resistive or active load will slow the VOUT ramp up toward the top of its curve. Fault Blanking On Start-Up During initial turn-on, the ISL6185 prevents nuisance faults being reported to the system controller by blanking the fault signal until the internal FET is fully enhanced. Current Trip and Limiting Levels The ISL6185 provides integrated current sensing in the MOSFET that allows for rapid control of OC events. Once an OC condition is detected the ISL6185 goes into its current limiting (CL) control mode. The ISL6185 is variant specified to allow a continuous current (ICONT) operation of 0.6A, 1.1A, 1.5A or 1.8A. As the current increases past its continuous current rating it will reach a level that causes the device to enter its current limit mode, that is the current trip level. The current trip level is in all cases adequately above the ICONT rating as to not cause unintended false faults. The current limit is specified at VOUT = VIN - 1V to test a known representative condition and is featured at a nominal value slightly higher than the continuous current rating. The speed of this current limiting control is inversely related to the magnitude of the OC fault. Thus a hard overcurrent is more quickly pulled to its limiting value than a marginal OC condition. Over-Temperature Shutdown Although the ISL6185 has an over-temperature shutdown and lockout feature, because of the 12ms timed shutdown the thermal shutdown is likely only to be invoked in extremely high ambient temperatures. The over- temperature protection invokes and disables the switch turn-on operation once the die temperature is ~+140°C, it will turn off an already on switch at ~+150°C and releases the part to operation once the die temperature falls to ~+120°C. ISL6185 |
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