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LT1764A Datasheet(PDF) 9 Page - Linear Integrated Systems |
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LT1764A Datasheet(HTML) 9 Page - Linear Integrated Systems |
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9 / 28 page  LT3089 9 3089f For more information www.linear.com/LT3089 BLOCK DIAGRAM – + 50µA IN IMON TEMPERATURE DEPENDENT CURRENT SOURCE 1µA/°C SET ILIM OUT 3089 BD PROGRAMMABLE CURRENT LIMIT CURRENT MONITOR IMON = ILOAD/5000 TEMP PIN FUNCTIONS IN: Input. This pin supplies power to regulate internal circuitry and supply output load current. For the device to operate properly and regulate, the voltage on this pin must be between the dropout voltage and 36V above the OUT pin (depending on output load current, see Dropout Voltage Specifications). OUT: Output. This is the power output of the device. The LT3089 requires a 3mA minimum load current for proper output regulation. TEMP: Temperature Output. This pin delivers a current proportional to the internal average junction temperature. Current output is 1µA/°C for temperatures above 5°C. The TEMP pin output current typically equals 25µA at 25°C. The output of the TEMP pin is valid for voltages from VOUT + 0.4V to VOUT – 40V. If unused, connect this pin to OUT. ILIM: Current Limit Program. A resistor between this pin and OUT programs output current limit to a level propor- tional to resistor value. Connect this resistor directly to OUT at the pins of the package. The typical ratio of current limit to resistor value is 175mA/kΩ with a 300Ω offset. If programmable current limit is not used, leave this pin open; the internal current limit of the LT3089 is still active, keeping the device inside safe operating limits. External voltage drops between the current limit resistor and VOUT will affect the current limit. Keep drops below 1mV. IMON: Output Current Monitor. The IMON pin sources a current typically equal to ILOAD/5000 or 200µA per amp of output current. Terminating this pin with a resistor to GND produces a voltage proportional to ILOAD. For example, at ILOAD = 800mA, IMON typically sources 160µA. With a 1k resistor to GND, this produces 160mV. The output of the IMON pin is valid for voltages from VOUT + 0.4V to VOUT – 40V. If unused, connect this pin to OUT. SET: Set. This pin is the error amplifier’s noninverting input and also sets the operating bias point of the circuit. A fixed 50μA current source flows out of this pin. A single external resistor programs VOUT. Output voltage range is 0V to 34.5V. Exposed Pad/Tab: Output. The exposed pad of the DF and FE packages and the tab of the R package are tied internally to OUT. As such, tie them directly to OUT (Pins 1-4/Pins 1-5, 8, 9, 16/Pin 4) at the PCB. The amount of copper area and planes connected to OUT determine the effective thermal resistance of the packages. NC: No Connection. No connect pins have no connection to internal circuitry and may be tied to IN, OUT, GND or floated. |
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