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LT6703HVCS5-3TRMPBF Datasheet(PDF) 11 Page - Linear Technology |
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LT6703HVCS5-3TRMPBF Datasheet(HTML) 11 Page - Linear Technology |
11 / 14 page LT6703-2/LT6703-3 LT6703HV-2/LT6703HV-3 11 670323fd APPLICATIONS INFORMATION Comparator Input The comparator input can range from ground to 18V (36V for LT6703HV), regardless of the supply voltage used. The typical input current for inputs well above the threshold (i.e., >800mV) is a few pA leaking into the input. With decreasing input voltage, a small bias current begins to be drawn out of the input, reaching a few nA when at ground potential. The input may be forced 100mV below ground without causing an improper output, though some additional bias current will begin to flow from the ESD input protection diode. Inputs driven further negative than 100mV below ground will not cause damage provided the current is limited to 10mA. Comparator Output The comparator output is open collector and capable of sinking 40mA typical. Load currents are directed out of the GND pin of the part. The output off-state voltage may range between – 0.3V and 18V (36V for LT6703HV) with respect to ground, regardless of the supply voltage used. When the output high state bias voltage is above 18V, a 100k minimum pull-up resistor is required and no total load capacitor greater than 100nF should be used. If the output high state is above 18V, caution has to be taken to prevent a short from the output directly to the bias voltage, even if the output is in the off state. As with any open-collector device, the outputs of multiple comparators may be tied together to implement wire-AND logic functions. Power Supplies The comparator circuitry operates from a single 1.4V to 18V supply. A minimum 0.1μF bypass capacitor is required between the VS pin and GND. When an output load is connected to the supply rail near the part and the output is sinking more than 5mA, a 1μF bypass capacitor is recommended. In instances where the supply is relatively “soft” (such as with small batteries) and susceptible to load steps, an additional 47Ω series decoupling resistor can further improve isolation of supply transients from the VS pin. |
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