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Linear Tech op amp offers accurate current output

Posted: 24 May 2002 ?? ?Print Version ?Bookmark and Share

Keywords:lt1970? operation amplifier? power supply amplifier?

The LT1970 operation amplifier from Linear Technology Corp. uses a 0Vdc to 5Vdc control signal to set the source and sink currents with a 2 percent accuracy. This makes the device suitable for use in applications that require precise load voltage and current control including analog pin drivers in ATE, linear laser TEC controllers, and laboratory power supplies.

The amplifier operates from a single or split supply of 5V to 36V, and produces an output of up to 500mA. However, the IC can directly drive external power transistors to boost the output current to any desired level.

The LT1970 has three diagnostic flags to indicate the operational status of the part. The open collector status flags can directly drive LEDs to signal that one amplifier has entered current limit (sourcing or sinking), as well as thermal shutdown.

The device has a 3.6MHz gain-bandwidth product with 1.6V/ms slew rate and also features a shutdown/enable control input, built-in self current limit of 800mA if the source resistor is lost, and thermal shutdown protection.

The 20-pin thermally-enhanced TSSOP device is rated for operation from -400C to 850C, and is priced at $4.95 each in 1,000-piece quantities.

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