Datasheet LT3081 (Analog Devices) - 10
| Manufacturer | Analog Devices |
| Description | 1.5A Single Resistor Rugged Linear Regulator with Monitors |
| Pages / Page | 32 / 10 — pin FuncTions. IN:. IMON:. OUT:. SET:. TEMP:. Exposed Pad/Tab:. LIM:. … |
| File Format / Size | PDF / 475 Kb |
| Document Language | English |
pin FuncTions. IN:. IMON:. OUT:. SET:. TEMP:. Exposed Pad/Tab:. LIM:. NC:. block DiagraM
Model Line for this Datasheet
- LT3081EDF#PBF LT3081EDF#PBF LT3081EDF#TRPBF LT3081EDF#TRPBF LT3081EFE#PBF LT3081EFE#PBF LT3081EFE#TRPBF LT3081EFE#TRPBF LT3081ER#PBF LT3081ER#PBF LT3081ER#TRPBF LT3081ER#TRPBF LT3081ET7#06PBF LT3081ET7#06PBF LT3081ET7#PBF LT3081ET7#PBF LT3081HFE#PBF LT3081HFE#PBF LT3081HFE#TRPBF LT3081HFE#TRPBF LT3081HT7#PBF LT3081HT7#PBF LT3081IDF#PBF LT3081IDF#PBF LT3081IDF#TRPBF LT3081IDF#TRPBF LT3081IFE#PBF LT3081IFE#PBF LT3081IFE#TRPBF LT3081IFE#TRPBF LT3081IR#PBF LT3081IR#PBF LT3081IR#TRPBF LT3081IR#TRPBF LT3081IT7#PBF LT3081IT7#PBF LT3081MPFE#PBF LT3081MPFE#PBF LT3081MPFE#TRPBF LT3081MPFE#TRPBF LT3081MPT7#PBF LT3081MPT7#PBF
Text Version of Document
LT3081
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 = 1.5A, IMON typically sources 300µA. With a Voltage Specifications). 1k resistor to GND, this produces 300mV. 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 LT3081 requires a 5mA 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 and + 0.4V to VOUT – 40V. If unused, connect this pin to OUT. FE packages and the tab of the R and T7 packages 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/Pin 4) at the PCB. The amount tional to resistor value. Connect this resistor directly to of copper area and planes connected to OUT determine OUT at the pins of the package. The typical ratio of current the effective thermal resistance of the packages. limit to resistor value is 360mA/kΩ with a 450Ω 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 LT3081 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 3081 BD 3081fc 10 For more information www.linear.com/LT3081 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 = 1.5A, IMON typically sources 300µA. With a Voltage Specifications). 1k resistor to GND, this produces 300mV. 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 LT3081 requires a 5mA 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 and + 0.4V to VOUT – 40V. If unused, connect this pin to OUT. FE packages and the tab of the R and T7 packages 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/Pin 4) at the PCB. The amount tional to resistor value. Connect this resistor directly to of copper area and planes connected to OUT determine OUT at the pins of the package. The typical ratio of current the effective thermal resistance of the packages. limit to resistor value is 360mA/kΩ with a 450Ω 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 LT3081 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 3081 BD 3081fc 10 For more information www.linear.com/LT3081 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
