LT1072: 1.25A High Efficiency Switching Regulator Data Sheet8/27/2007201K
Features and Benefits
- Available in MiniDIP, TO-220, and TO-3 Packages
- Wide Input Voltage Range: 3V to 60V
- Low Quiescent Current: 6mA
- Internal 1.25A Switch
- Very Few External Parts Required
- Self-Protected Against Overloads
- Operates in Nearly All Switching Topologies
- Shutdown Mode Draws Only 50µA Supply Current
- Flyback-Regulated Mode has Fully Floating Outputs
- Can be Externally Synchronized
The LT®1072 is a monolithic high power switching regulator. It can be operated in all standard switching configurations including buck, boost, flyback, forward, inverting and “Cuk”. A high current, high efficiency switch is included on the die along with all oscillator, control, and protection circuitry. Integration of all functions allows the LT1072 to be built in a standard 5-pin TO-3 or TO-220 power package as well as the 8-pin miniDlP. This makes it extremely easy to use and provides "bustproof" operation similar to that obtained with 3-pin linear regulators.
The LT1072 operates with supply voltages from 3V to 60V, and draws only 6mA quiescent current. It can deliver load power up to 20 watts with no external power devices. By utilizing current-mode switching techniques, it provides excellent AC and DC load and line regulation.
The LT1072 has many unique features not found even on the vastly more difficult to use low power control chips presently available. It uses an adaptive anti-sat switch drive to allow very wide ranging load currents with no loss in efficiency. An externally activated shutdown mode reduces total supply current to 50µA typical for standby operation. Totally isolated and regulated outputs can be generated by using the optional “flyback regulation mode” built into the LT1072, without the need for optocouplers or extra transformer windings.
- Logic Supply 5V at 2.5A
- 5V Logic to ±15V Op Amp Supply
- Offline Converter up to 50W
- Battery Upconverter
- Power Inverter (+ to -) or (- to +)
- Fully Floating Multiple Outputs
- Driver for High Current Supplies
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
R012 Reliability Data3/23/201831 K
AN29 - Some Thoughts on DC-DC Converters3/8/20131M
AN45 - Measurement and Control Circuit Collection11/29/20121M
AN32 - High Efficiency Linear Regulators9/8/2010798K
AN19 - LT1070 Design Manual8/14/2009640K
AN30 - Switching Regulator Circuit Collection10/31/2008592K
AN46 - Efficiency and Power Characteristics of Switching Regulator Circuits8/20/20072M
AN31 - Linear Circuits for Digital Systems8/20/20071M
DN27 - Design Considerations for RS-232 Interfaces6/28/2016311K
DN31 - Isolated Power Supplies for Local Area Networks4/1/2014105K
DN17 - Programming Pulse Generators for Flash Memories3/21/2014116K
Design Note 52: DC/DC Converters for Portable Computers7/1/1991
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.
To launch ready-to-run LTspice demonstration circuits for this part:
Step 1: Download and install LTspice on your computer.
Step 2: Click on the link in the section below to download a demonstration circuit.
Step 3: If LTspice does not automatically open after clicking the link below, you can instead run the simulation by right clicking on the link and selecting “Save Target As.” After saving the file to your computer, start LTspice and open the demonstration circuit by selecting ‘Open’ from the ‘File’ menu.
Models for the following parts are available in LTspice:
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|
|LT1072CN8#PBF||Material Declaration||Reliability Data||8-Lead PDIP (Narrow 0.3 Inch)|
|LT1072CS8#PBF||Material Declaration||Reliability Data||8-Lead SOIC (Narrow 0.15 Inch)|
|LT1072CS8#TRPBF||Material Declaration||Reliability Data||8-Lead SOIC (Narrow 0.15 Inch)|
|LT1072CSW#PBF||Material Declaration||Reliability Data||16-Lead SOIC (Wide 0.3 Inch)|
|LT1072CSW#TRPBF||Material Declaration||Reliability Data||16-Lead SOIC (Wide 0.3 Inch)|
|LT1072CT#06PBF||Material Declaration||Reliability Data||5-Lead TO-220 (Flow 06)|
|LT1072CT#PBF||Material Declaration||Reliability Data||5-Lead TO-220|
|LT1072HVCT#PBF||Material Declaration||Reliability Data||5-Lead TO-220|
|LT1072HVIT#PBF||Material Declaration||Reliability Data||5-Lead TO-220|
|LT1072IN8#PBF||Material Declaration||Reliability Data||8-Lead PDIP (Narrow 0.3 Inch)|
|LT1072IT#PBF||Material Declaration||Reliability Data||5-Lead TO-220|
|Wafer Fabrication Data||R012 Reliability Data|
Select a model from the dropdown below to subscribe to PCN/PDN notifications and view past notifications as well.
Support & Discussions
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.