Features and Benefits
- ±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.
- Automatic Test Equipment
- Laboratory Power Supplies
- Motor Drivers
- Thermoelectric Cooler Driver
Product Lifecycle Production
At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.
Documentation & Resources
R164 Reliability Data3/23/2018
Power Op Amp Protects Load Circuitry with Precise Current Limiting8/1/2002 LT Journal
Tools & Simulations
LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.
Models for the following parts are available in LTspice:
LT1970 Companion Parts
Recommended Related Parts
ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal.View our quality and reliability program and certifications for more information.
|Part Number||Material Declaration||Reliability Data||Pin/Package Drawing||CAD Symbols, Footprints & 3D Models|
|LT1970CFE#PBF||Material Declaration||Reliability Data||20-Lead TSSOP w/ EP|
|LT1970CFE#TRPBF||Material Declaration||Reliability Data||20-Lead TSSOP w/ EP|
|LT1970IFE#PBF||Material Declaration||Reliability Data||20-Lead TSSOP w/ EP|
|LT1970IFE#TRPBF||Material Declaration||Reliability Data||20-Lead TSSOP w/ EP|
|Wafer Fabrication Data||R164 Reliability Data|
Select a model from the dropdown below to subscribe to PCN/PDN notifications and view past notifications as well.
Sample & Buy
See our Ordering FAQs for answers to questions about online orders, payment options and more.
Buy Now Pricing
(**) Displayed Buy Now Price and Price Range is based on small quantity orders.
(*)The 1Ku 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 Analog Devices, Inc. authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.
Please see the latest communication from our CCO regarding lead times.
Selecting the Sample button above will redirect to the third-party ADI Sample Site. The part selected will carry over to your cart on this site once logged in. Please create a new account there if you have never used the site before. Contact SampleSupport@analog.com with any questions regarding this Sample Site.