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ISL61863EIRZ Datasheet(PDF) 8 Page - Intersil Corporation |
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ISL61863EIRZ Datasheet(HTML) 8 Page - Intersil Corporation |
8 / 18 page ISL6186 8 FN7698.1 September 1, 2011 Functional Description Power On Reset (POR) The ISL6186 POR feature inhibits device functionality when VIN <VUVLO. Reverse Polarity Protection In any event in which the power switch is disabled or powered down, 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 voltage on the VOUT pin will ramp up according to 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 ISL6186 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 ISL6186 provides integrated current sensing in the MOSFET, which allows for rapid control of OC events. Once an OC condition is detected, the ISL6186 goes into its current limiting (CL) control mode. The ISL6186 is variant specified to allow a continuous current (ICONT) operation of 1.5A, 3A or 3.6A. 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 so as not to 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 ISL6186 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. FAULT does not respond to OT events. 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. Turn-off Time Delay During operation, once an OC condition is detected, the output is current limited for ~12ms to allow transient OC conditions to pass. If still in current limit and after the current limit period has elapsed, the output is then turned off, and the fault is reported by pulling the FAULT output low. The internal 12ms timer starts upon current limiting and is independent of ambient or IC thermal conditions, thus providing more consistent operation over the entire temperature range. Latch-off Restart/Auto-Restart Start After turn-off, with the latch-off options, both the output and the FAULT signal are latched low until reset by the enable signal being de-asserted, at which time the FAULT signal will clear and the IC is ready for enable to assert. On the auto-restart options, the ISL6186 will attempt to periodically turn on the output at approximately 1s intervals as long as the enable is asserted. If the OC condition remains indefinitely, so will the fault indication and the restart attempts, until such time as the thermal protection feature is invoked, thus increasing the restart period. Power-Good Output This feature is an active low, open-drain, power-good indicator that asserts after VOUT/VIN>90% and de-asserts when VOUT/VIN < 85%. It immediately de-asserts upon the IC being disabled. Active Output Pull-down Another ISL6186 feature is the 10k Ω active pull-down on the outputs to <60mV above GND when the device is disabled, thus ensuring discharge of the load. Typical Performance Curves FIGURE 3. SWITCH ON-RESISTANCE AT 0.5A FIGURE 4. NORMALIZED SWITCH RESISTANCE 85 80 75 70 65 60 55 50 45 40 35 -40 -25 0 254575 85 115 TEMPERATURE (°C) VIN = 2.5V VIN = 3.3V VIN = 5V 0.7 0.8 0.9 1.0 1.1 1.2 1.3 -40 -25 0 254575 85 115 TEMPERATURE (°C) |
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