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LTC1165CN8 Datasheet(PDF) 4 Page - Linear Technology |
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LTC1165CN8 Datasheet(HTML) 4 Page - Linear Technology |
4 / 8 page 4 LTC1163/LTC1165 CC HARA TERISTICS A TYPICALPERFOR CE PI FU CTIO S Input Pins The LTC1163 is noninverting; i.e., the MOSFET gate is driven above the supply when the input pin is held high. The LTC1165 is inverting and drives the MOSFET gate high when the input pin is held low. The inverting inputs of the LTC1165 allow P-channel switches to be replaced by lower resistance/cost N-channel switches while maintain- ing system drive polarity. The LTC1163/LTC1165 logic inputs are high impedance CMOS gates with ESD protection diodes to ground and therefore should not be forced below ground. The inputs can however, be driven above the power supply rail as there are no clamping diodes connected between the input pins and supply pin. This facilitates operation in mixed 5V/3V systems. Output Pins The output pin is either driven to ground when the switch is turned OFF or driven above the supply rail when the switch is turned ON. The output is clamped to about 14V above ground by a built-in Zener clamp. This pin has 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 A 150 Ω resistor should be inserted in series with the ground pin or supply pin if negative supply voltage tran- sients are anticipated. This will limit the current flowing from the power source into the LTC1163/LTC1165 to tens of milliamps during reverse battery conditions. OPERATIO The LTC1163/LTC1165 are triple micropower MOSFET drivers designed for operation over the 1.8V to 6V supply range and include the following functional blocks: 3V Logic Compatible Inputs The LTC1163/LTC1165 inputs have been designed to accommodate a wide range of 3V and 5V logic families. The input threshold voltage is set at roughly 50% of the supply voltage and approximately 200mV of input hyster- esis is provided to ensure clean switching. The input enables all of the following circuit blocks: the bias generator, the high frequency oscillator and gate charge pump. Therefore, when the input is turned off, the entire circuit powers down and the supply current drops below 1 µA. Standby Supply Current TEMPERATURE (°C) 0 5 4 3 2 1 0 –1 10 20 30 40 LTC1163/65 • TPC07 50 60 70 MOSFET Gate Drive Current GATE VOLTAGE ABOVE SUPPLY (V) 1 10 100 1000 04 6 8 0.1 2 10 LTC1163/65 • TPC09 VS = 5V VS = 3.3V VS = 2.2V VS = 1.8V TA = 25°C Supply Current per Driver ON TEMPERATURE (°C) 0 300 250 200 150 100 50 0 10 20 30 40 LTC1163/65 • TPC08 50 60 70 VS = 5V VS = 3.3V VS = 1.8V |
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