LT1970A - 500mA Power Op Amp with Adjustable Precision Current Limit

Features

  • ±500mA Minimum Output Current
  • Independent Adjustment of Source and Sink Current Limits
  • 1% Current Limit Accuracy
  • Improved Reactive Load Driving Stability
  • 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
  • Specified Temperature Range: –40°C to 85°C
  • Available in a 20-Lead TSSOP Package

Typical Application

LT1970A Typical Application
LT1970A Typical Application

Description

The LT®1970A 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 1% 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 LT1970A can drive capacitive and inductive loads directly.

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 LT1970A is packaged in a 20-lead TSSOP package with a thermally conductive copper bottom plate to facilitate heat sinking.

Packaging

CAD Symbols and Footprints: The downloadable Zip file below contains the schematic symbol and PCB footprints.

For complete and up to date package information and drawings, please refer to our packaging page

Part Number Package Code Temp Package
Drawing
RoHS
LT1970ACFE#PBF TSSOP-20 FE C 05-08-1663 (CA) Yes
LT1970ACFE#TRPBF TSSOP-20 FE C 05-08-1663 (CA) Yes
LT1970AIFE#PBF TSSOP-20 FE I 05-08-1663 (CA) Yes
LT1970AIFE#TRPBF TSSOP-20 FE I 05-08-1663 (CA) Yes


LT1970A Package Drawing

Order Info

  • Part numbers ending in PBF are lead free. Solder plated terminal finish (SnPb) versions are non-standard and special terms and conditions and pricing applies if available. Please contact LTC marketing for information.
  • Part numbers containing TR or TRM are shipped in tape and reel or 500 unit mini tape and reel, respectively
  • Please refer to our general ordering information or the product datasheet for more details

Package Variations and Pricing

Part Number Package Temp Price
(1-99)
Price
(1k)*
RoHS
LT1970ACFE#PBF TSSOP-20 C $6.05 $4.95 Yes
LT1970ACFE#TRPBF TSSOP-20 C $5.07 Yes
LT1970AIFE#PBF TSSOP-20 I $7.15 $5.70 Yes
LT1970AIFE#TRPBF TSSOP-20 I $5.82 Yes
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* The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Linear Technology sales office or authorized distributor.

Demo Boards

Linear Technology offers many demo boards free of charge to qualified customers. Contact your local sales office or distributor to inquire about a demo board. Certain demo boards are also available for sale via credit card on this website. Demo boards are for evaluation purposes only. It remains the customer’s responsibility to verify proper and reliable operation in the actual end application.

Part Number Description Price Documentation
DC453B-A LT1970ACFE | Power Op Amp with Adjustable Current Limit Non-Boosted $150.00
DC453B-B LT1970ACFE | Power Op Amp with Adjustable Current Limit Boosted $150.00
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Click here to view our complete list of demo boards

Applications

  • Automatic Test Equipment
  • Laboratory Power Supplies
  • Motor Drivers
  • Thermoelectric Cooler Driver

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Design Tools

LTspice

LTspice® software is a powerful, fast and free simulation tool, schematic capture and waveform viewer with enhancements and models for improving the simulation of switching regulators. Click here to download LTspice

Models for the following parts are available in LTspice:
LT1970

Technical Support