LT1970

PRODUCTION

500mA Power Op Amp with Adjustable Precision Current Limit

Data Sheet Product Selection Table
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Overview

  • ±500mA Minimum Output Current
  • Independent Adjustment of Source and Sink Current Limits
  • 2% Current Limit Accuracy
  • Operates with Single or Split Supplies
  • Shutdown/Enable Control Input
  • Open Collector Status Flags:
    • Sink Current Limit
    • Source Current Limit
    • Thermal Shutdown
  • Fail Safe Current Limit and Thermal Shutdown
  • 1.6V/µs Slew Rate
  • 3.6MHz Gain Bandwidth Product
  • Fast Current Limit Response: 2MHz Bandwidth
  • Specified Temperature Range: –40°C to 85°C

The LT1970 is a ±500mA power op amp with precise externally controlled current limiting. Separate control voltages program the sourcing and sinking current limit sense thresholds with 2% accuracy. Output current may be boosted by adding external power transistors.

The circuit operates with single or split power supplies from 5V to 36V total supply voltage. In normal operation, the input stage supplies and the output stage supplies are connected (VCC to V+ and VEE to V–). To reduce power dissipation it is possible to power the output stage (V+, V–) from independent, lower voltage rails. The amplifier is unity-gain stable with a 3.6MHz gain bandwidth product and slews at 1.6V/µs. The current limit circuits operate with a 2MHz response between the VCSRC or VCSNK control inputs and the amplifier output.

Open collector status flags signal current limit circuit activation, as well as thermal shutdown of the amplifier. An enable logic input puts the amplifier into a low power, high impedance output state when pulled low. Thermal shutdown and a ±800mA fixed current limit protect the chip under fault conditions.

The LT1970 is packaged in a 20-lead TSSOP package with a thermally conductive copper bottom plate to facilitate heat sinking.

Applications

  • Automatic Test Equipment
  • Laboratory Power Supplies
  • Motor Drivers
  • Thermoelectric Cooler Driver
LT1970
500mA Power Op Amp with Adjustable Precision Current Limit
AV = 2 Amplifi er with Adjustable ±500mA Full-Scale Current Limit and Fault Indication Current Limited Sinewave Into 10Ω Load Product Package 1
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Documentation

Data Sheet 1

Reliability Data 1

Application Note 1

Design Note 2

Technical Articles 1

Data Sheet

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Software Resources

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Hardware Ecosystem

Parts Product Life Cycle Description
Operational Amplifiers (Op Amps) 1
LT1970A
RECOMMENDED FOR NEW DESIGNS 500mA Power Op Amp with Adjustable Precision Current Limit
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Tools & Simulations

LTspice

Models for the following parts are available in LTspice:

  • LT1970
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Latest Discussions

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