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LT1175IS8-5 Datasheet(PDF) 7 Page - Linear Technology |
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LT1175IS8-5 Datasheet(HTML) 7 Page - Linear Technology |
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7 / 18 page  LT1175 1175fe pin FuncTions VIN (Pins 1, 8/Pin 3, Tab/Pin 2, Tab/Pins 1, 8/Pin 3, Tab): Power is supplied to the device through this pin. A bypass capacitor is required on this pin if the device is more than six inches away from the main filter capacitor. In general, the impedance of a battery rises with frequency, so it is advisabletoincludeabypasscapacitorinbattery-powered circuits. A 1µF or larger tantalum capacitor is suggested for all applications, but if low ESR capacitors such as ceramic or film are used for the output and input capaci- tors, the input capacitor should be three times the value of the output capacitor. ILIM2, ILIM4 (Pins 2, 7/NA/NA/Pins 2, 7/NA): The two currentlimitpinsareemittersectionsofthepowertransis- tor. When left open, they float several hundred millivolts above the negative input voltage. When shorted to the input voltage, they increase current limit by a minimum of 200mA for ILIM2 and 400mA for ILIM4. These pins must be connected only to the input voltage, either directly or through a resistor. OUTPUT (Pin 3/Pin 1/Pin 1/Pin 3/Pin 1): The OUTPUT pin isthecollectoroftheNPNpowertransistor.Itcanbeforced to the input voltage, to ground or up to 2V positive with respect to ground without damage or latchup (see Output VoltageReversalinApplicationsInformationsection).The LT1175 has foldback current limit, so maximum current at the OUTPUT pin is a function of input-to-output voltage. See Typical Performance Characteristics. SENSE (Pin 4/Pin 2/NA/Pin 4/Pin 2): The SENSE pin is used in the adjustable version to allow custom selection of output voltage, with an external divider set to generate 3.8V at the SENSE pin. Input bias current is typically 75nA flowing out of the pin. Maximum forced voltage on the SENSE pin is 2V and –10V with respect to GND pin. The fixed 5V version utilizes the SENSE pin to give true Kelvin connections to the load or to drive an external pass transistor for higher output currents. Bias current out of the 5V SENSE pin is approximately 12µA. Separating the SENSE and OUTPUT pins also allows for a new loop compensation technique described in the Applications Information section. GND (Pin 5/Pin 4/Pin 3/Pin 5/Pin 4): The GND pin has a quiescent current of 45µA at zero load current, increas- ing by approximately 10µA per mA of output current. At 500mA output current, GND pin current is about 5mA. Current flows into the GND pin. SHDN (Pin 6/Pin 5/NA/Pin 6/Pin 5): The SHDN pin is specially configured to allow it to be driven from either positive voltage logic or with negative only logic. Forc- ing the SHDN pin 2V either above or below the GND pin will turn the regulator on. This makes it simple to connect directly to positive logic signals for active low shutdown. If no positive voltages are available, the SHDN pin can be driven below the GND pin to turn the regulator on. When left open, the SHDN pin will default low to a regulator “on” condition. For all voltages below absolute maximum ratings, the SHDN pin draws only a few microamperes of current (see Typical Performance Characteristics).Maximumvoltageonthe SHDNpinis15V, –20V with respect to the GND pin and 35V, –5V with respect to the negative input pin. (N8/Q/ST/S8/T) |
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