Using a Linear Regulator to Produce a Constant Current Source

Reference Design using part MAX1818 by Analog Devices

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Manufacturer

Analog Devices
  • Application Category
    Power Supplies
  • Product Type
    DC to DC Single Output Power Supplies

For End Products

  • Cellular Phone
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  • Notebook
  • Personal Digital Assistant
  • Wireless Base Station

Description

  • High-side constant-current source features the MAX1818 LDO and draws 1.5V/ROUT from RLOAD. The circuit requires the voltage for ROUT between the IN and GND terminals to be minimally 2.5V

Key Features

  • Conversion Type
    DC to DC
  • Input Voltage
    5.5 V
  • Output Voltage
    1.5 V

Featured Parts (8)

Featured Parts
Part Number Manufacturer Type Description
MAX1818EUT33+T Analog Devices Linear Regulators LDO Regulator Pos 1.25V to 5V3.3V 0.5A 6-Pin SOT-23 T/R Buy
MAX1818EUT50+T Analog Devices Linear Regulators LDO Regulator Pos 1.25V to 5V5V 0.5A 6-Pin SOT-23 T/R Buy
MAX1818EUT25+ Analog Devices Linear Regulators LDO Regulator Pos 1.25V to 5V2.5V 0.5A 6-Pin SOT-23 T/R Buy
MAX1818EUT50+ Analog Devices Linear Regulators LDO Regulator Pos 1.25V to 5V5V 0.5A 6-Pin SOT-23 T/R Buy
MAX1818EUT18+T Analog Devices Linear Regulators LDO Regulator Pos 1.25V to 5V1.8V 0.5A 6-Pin SOT-23 T/R Buy
MAX1818EUT33+ Analog Devices Linear Regulators LDO Regulator Pos 1.25V to 5V3.3V 0.5A 6-Pin SOT-23 T/R Buy
MAX1818EUT25+T Analog Devices Linear Regulators LDO Regulator Pos 1.25V to 5V2.5V 0.5A 6-Pin SOT-23 T/R Buy
MAX1818EUT15+T Analog Devices Linear Regulators LDO Regulator Pos 1.25V to 5V1.5V 0.5A 6-Pin SOT-23 T/R Buy

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