Features and Benefits
- Greatly Reduced Conducted and Radiated EMI (<100µVP-P in Typical Application)
- Low Switching Harmonic Content
- Independent Control of Switch Voltage and Current Slew Rates
- Two 1A Current Limited Power Switches
- Regulates Positive and Negative Voltages
- 20kHz to 250kHz Oscillator Frequency
- Easily Synchronized to External Clock
- Wide Input Voltage Range: 2.7V to 23V
- Low Shutdown Current: 12µA Typical
- Easier Layout than with Conventional Switchers
- Outputs Can Be Forced to 50% Duty Cycle for Unregulated Applications
The LT1533 is a new class of switching regulator designed to reduce conducted and radiated electromagnetic interference (EMI). Ultralow noise and EMI are achieved by providing user control of the output switch slew rates. Voltage and current slew rates can be independently programmed to optimize switcher harmonic content versus efficiency. The LT1533 can reduce high frequency harmonic power by as much as 40dB with only minor losses in efficiency.
The LT1533 utilizes a dual output switch current mode architecture optimized for low noise topologies. The IC includes two 1A power switches along with all necessary oscillator, control and protection circuitry. Unique error amp circuitry can regulate both positive and negative voltages. The internal oscillator may be synchronized to an external clock for more accurate placement of switching harmonics. Protection features include cycle by cycle current limit protection, undervoltage lockout and thermal shutdown.
Low minimum supply voltage and low supply current during shutdown make the LT1533 well suited for portable applications. The part may also be forced into a 50% duty cycle mode for unregulated applications. The LT1533 is available in the 16-pin narrow SO package.
- Precision Instrumentation Systems
- Isolated Supplies for Industrial Automation
- Medical Instruments
- Wireless Communications
- Single Board Data Acquisition Systems
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.
Evaluation Kits (5)
DC230A-B: Demo Board for the LT1533 Ultralow Noise 1A Switching Regulator.
DC230A-C: Demo Board for the LT1533 Ultralow Noise 1A Switching Regulator.
DC230A-D: Demo Board for LT1533 Ultralow Noise 1A Switching Regulator.
Documentation & Resources
R386 Reliability Data3/22/2018
AN118 - High Voltage, Low Noise, DC/DC Converters6/17/2015
AN94 - Slew Rate Verification for Wideband Amplifiers: The Taming of the Slew11/16/2007
AN90 - Current Sources for Fiber Optic Lasers: A Compendium of Pleasant Current Events8/20/2007
AN84 - Linear Technology Magazine Circuit Collection, Volume IV8/20/2007
AN75 - Circuitry for Signal Conditioning and Power Conversion8/20/2007
AN70 - A Monolithic Switching Regulator with 100µV Output Noise8/20/2007
DC230A - Demo Manual9/24/2009
LT1533 - SPECIFICATION NOTICE11/22/2004
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:
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|
|LT1533CS#PBF||Material Declaration||Reliability Data||16-Lead SOIC (Narrow 0.15 Inch)|
|LT1533CS#TRPBF||Material Declaration||Reliability Data||16-Lead SOIC (Narrow 0.15 Inch)|
|LT1533IS#PBF||Material Declaration||Reliability Data||16-Lead SOIC (Narrow 0.15 Inch)|
|LT1533IS#TRPBF||Material Declaration||Reliability Data||16-Lead SOIC (Narrow 0.15 Inch)|
|Wafer Fabrication Data||R386 Reliability Data|
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Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.