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LTC1153 Datasheet(PDF) 5 Page - Linear Technology |
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LTC1153 Datasheet(HTML) 5 Page - Linear Technology |
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5 / 16 page  5 LTC1153 Auto-Reset Time* Shutdown Threshold Voltage MOSFET Gate Drive Current CC HARA TERISTICS A TYPICALPERFOR CE TEMPERATURE (°C) –50 0.4 0.6 1.O 1.2 1.4 2.4 1.8 0 50 75 LTC1153 • TPC13 0.8 2.0 2.2 1.6 –25 25 100 125 VS = 18V VS = 5V TEMPERATURE (°C) –25 0.1 1 10 25 LTC1153 • TPC14 –50 125 0 50 75 100 *SECONDS OF DELAY PER µF CT VS = 5V VS = 12V VS = 18V PI FU CTIO S Input and Shutdown Pins The LTC1153 input pin is active high and activates all of the protection and charge pump circuitry when switched ON. The shutdown pin is designed to break the circuit if a secondary fault condition (over temperature, etc.) is de- tected. The LTC1153 logic and shutdown inputs are high impedance CMOS gates with ESD protection diodes to ground and supply and therefore should not be forced beyond the power supply rails. The shutdown pin should be connected to ground when not in use. Timing Capacitor Pin (Auto-Reset Timer) The small capacitor charging current (4.2 µA) produces large delays with relatively small valued capacitors, but care must be taken to ensure that this current is not shunted to ground through a leaky capacitor or printed circuit board trace. The timing capacitor voltage is sensed by a high impedance CMOS comparator input with ESD clamp diodes to ground and supply and therefore should not be forced beyond the power supply rails. This pin can be grounded if the auto-reset function is not used. MOSFET Gate Drive Pin The MOSFET gate drive pin is either driven to ground when the switch is turned OFF or driven above the supply rail when the switch is turned ON. This pin is a relatively high impedance when driven above the rail (the equivalent of a few hundred k Ω). Care should be taken to minimize any loading of this pin by parasitic resistance to ground or supply. Supply Pin The supply pin of the LTC1153 serves two vital purposes. The first is obvious: it powers the input, gate drive, regu- lation and protection circuitry. The second purpose is less obvious: it provides a Kelvin connection to the top of the drain sense resistor for the internal 100mV reference. The LTC1153 is designed to be continuously powered so that the gate of the MOSFET is actively driven at all times. If it is necessary to remove power from the supply pin and then re-apply it, the input pin (or enable pin) should be cycled a few milliseconds after the power is re-applied to reset the input latch and protection circuitry. Also, the input and enable pins should be isolated with 10k resistors to limit the current flowing through the ESD protection diodes to the supply pin. The supply pin of the LTC1153 should never be forced below ground as this may result in permanent damage to the device. A 300 Ω resistor should be inserted in series with the ground pin if negative supply voltage transients are anticipated. GATE VOLTAGE ABOVE SUPPLY (V) 1 10 100 1000 0 8 12 16 0.1 4 20 LTC1153 • TPC15 VS = 18V TA = 25°C VS = 12V VS = 5V |
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Similar Description - LTC1153 |
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