Datasheet LT3089 (Analog Devices) - 9
| Hersteller | Analog Devices |
| Beschreibung | 800mA Single Resistor Rugged Linear Regulator with Monitors |
| Seiten / Seite | 28 / 9 — PIN FUNCTIONS. IN:. IMON:. OUT:. SET:. TEMP:. Exposed Pad/Tab:. LIM:. … |
| Dateiformat / Größe | PDF / 1.8 Mb |
| Dokumentensprache | Englisch |
PIN FUNCTIONS. IN:. IMON:. OUT:. SET:. TEMP:. Exposed Pad/Tab:. LIM:. NC:. BLOCK DIAGRAM
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Textversion des Dokuments
LT3089
PIN FUNCTIONS IN:
Input. This pin supplies power to regulate internal
IMON:
Output Current Monitor. The IMON pin sources a circuitry and supply output load current. For the device current typically equal to ILOAD/5000 or 200µA per amp of to operate properly and regulate, the voltage on this pin output current. Terminating this pin with a resistor to GND must be between the dropout voltage and 36V above the produces a voltage proportional to ILOAD. For example, OUT pin (depending on output load current, see Dropout at ILOAD = 800mA, IMON typically sources 160µA. With Voltage Specifications). a 1k resistor to GND, this produces 160mV. The output
OUT:
Output. This is the power output of the device. The of the IMON pin is valid for voltages from VOUT + 0.4V to LT3089 requires a 3mA minimum load current for proper VOUT – 40V. If unused, connect this pin to OUT. output regulation.
SET:
Set. This pin is the error amplifier’s noninverting
TEMP:
Temperature Output. This pin delivers a current input and also sets the operating bias point of the circuit. proportional to the internal average junction temperature. A fixed 50μA current source flows out of this pin. A single Current output is 1µA/°C for temperatures above 5°C. The external resistor programs VOUT. Output voltage range is TEMP pin output current typically equals 25µA at 25°C. 0V to 34.5V. The output of the TEMP pin is valid for voltages from VOUT
Exposed Pad/Tab:
Output. The exposed pad of the DF + 0.4V to VOUT – 40V. If unused, connect this pin to OUT. and FE packages and the tab of the R package are tied
I
internally to OUT. As such, tie them directly to OUT (Pins
LIM:
Current Limit Program. A resistor between this pin and OUT programs output current limit to a level propor- 1-4/Pins 1-5, 8, 9, 16/Pin 4) at the PCB. The amount of tional to resistor value. Connect this resistor directly to copper area and planes connected to OUT determine the OUT at the pins of the package. The typical ratio of current effective thermal resistance of the packages. limit to resistor value is 175mA/kΩ with a 300Ω offset.
NC:
No Connection. No connect pins have no connection If programmable current limit is not used, leave this pin to internal circuitry and may be tied to IN, OUT, GND or open; the internal current limit of the LT3089 is still active, floated. 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.
BLOCK DIAGRAM
IN 50µA + CURRENT TEMPERATURE MONITOR DEPENDENT – IMON = ILOAD/5000 CURRENT SOURCE PROGRAMMABLE 1µA/°C CURRENT LIMIT IMON TEMP SET ILIM OUT 3089 BD 3089f For more information www.linear.com/LT3089 9 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Applications Information Typical Applications Package Description Revision History Typical Application Related Parts
PIN FUNCTIONS IN:
Input. This pin supplies power to regulate internal
IMON:
Output Current Monitor. The IMON pin sources a circuitry and supply output load current. For the device current typically equal to ILOAD/5000 or 200µA per amp of to operate properly and regulate, the voltage on this pin output current. Terminating this pin with a resistor to GND must be between the dropout voltage and 36V above the produces a voltage proportional to ILOAD. For example, OUT pin (depending on output load current, see Dropout at ILOAD = 800mA, IMON typically sources 160µA. With Voltage Specifications). a 1k resistor to GND, this produces 160mV. The output
OUT:
Output. This is the power output of the device. The of the IMON pin is valid for voltages from VOUT + 0.4V to LT3089 requires a 3mA minimum load current for proper VOUT – 40V. If unused, connect this pin to OUT. output regulation.
SET:
Set. This pin is the error amplifier’s noninverting
TEMP:
Temperature Output. This pin delivers a current input and also sets the operating bias point of the circuit. proportional to the internal average junction temperature. A fixed 50μA current source flows out of this pin. A single Current output is 1µA/°C for temperatures above 5°C. The external resistor programs VOUT. Output voltage range is TEMP pin output current typically equals 25µA at 25°C. 0V to 34.5V. The output of the TEMP pin is valid for voltages from VOUT
Exposed Pad/Tab:
Output. The exposed pad of the DF + 0.4V to VOUT – 40V. If unused, connect this pin to OUT. and FE packages and the tab of the R package are tied
I
internally to OUT. As such, tie them directly to OUT (Pins
LIM:
Current Limit Program. A resistor between this pin and OUT programs output current limit to a level propor- 1-4/Pins 1-5, 8, 9, 16/Pin 4) at the PCB. The amount of tional to resistor value. Connect this resistor directly to copper area and planes connected to OUT determine the OUT at the pins of the package. The typical ratio of current effective thermal resistance of the packages. limit to resistor value is 175mA/kΩ with a 300Ω offset.
NC:
No Connection. No connect pins have no connection If programmable current limit is not used, leave this pin to internal circuitry and may be tied to IN, OUT, GND or open; the internal current limit of the LT3089 is still active, floated. 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.
BLOCK DIAGRAM
IN 50µA + CURRENT TEMPERATURE MONITOR DEPENDENT – IMON = ILOAD/5000 CURRENT SOURCE PROGRAMMABLE 1µA/°C CURRENT LIMIT IMON TEMP SET ILIM OUT 3089 BD 3089f For more information www.linear.com/LT3089 9 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Applications Information Typical Applications Package Description Revision History Typical Application Related Parts