LT1533
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LT1533

Ultralow Noise 1A Switching Regulator

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Part Models 4
1ku List Price Starting From $6.09
Features
  • 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
Additional Details
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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.

Applications

  • Precision Instrumentation Systems
  • Isolated Supplies for Industrial Automation
  • Medical Instruments
  • Wireless Communications
  • Single Board Data Acquisition Systems
Part Models 4
1ku List Price Starting From $6.09

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Documentation

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Part Model Pin/Package Drawing Documentation CAD Symbols, Footprints, and 3D Models
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Product Lifecycle

PCN

Oct 8, 2024

- 24_0236

Migrating Bottom Trace Code Marking to Top Side Laser Marking for SOIC_N Package

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LT1533CS#TRPBF

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LT1533IS#PBF

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Oct 12, 2022

- 22_0252

Epoxy Change from Henkel 8290 to 8290A for 16-Lead SOIC Package

LT1533CS#PBF

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PRODUCTION

LT1533IS#PBF

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Aug 6, 2022

- 22_0173

Laser Top Mark Conversion for SOICN14 and SOICN16 Packages Assembled on ADPG [PNG]

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Filter by Model

reset

Reset Filters

Part Models

Product Lifecycle

PCN

Oct 8, 2024

- 24_0236

arrow down

Migrating Bottom Trace Code Marking to Top Side Laser Marking for SOIC_N Package

LT1533CS#PBF

PRODUCTION

LT1533CS#TRPBF

PRODUCTION

LT1533IS#PBF

PRODUCTION

LT1533IS#TRPBF

PRODUCTION

Oct 12, 2022

- 22_0252

arrow down

Epoxy Change from Henkel 8290 to 8290A for 16-Lead SOIC Package

LT1533CS#PBF

PRODUCTION

LT1533CS#TRPBF

PRODUCTION

LT1533IS#PBF

PRODUCTION

LT1533IS#TRPBF

PRODUCTION

Aug 6, 2022

- 22_0173

arrow down

Laser Top Mark Conversion for SOICN14 and SOICN16 Packages Assembled on ADPG [PNG]

LT1533CS#PBF

PRODUCTION

LT1533CS#TRPBF

PRODUCTION

LT1533IS#PBF

PRODUCTION

LT1533IS#TRPBF

PRODUCTION

Software & Part Ecosystem

Evaluation Kits 5

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DC230A-B

LT1533CS | Ultra Low Noise Bipolar Output DC/DC Converter, 12VIN to +/-5VOUT @ 700mA, VIN min.=10.8V, 3.5W Output

DC173B

LT1533CS | Ultra Low Noise Boost Converter, 5V Input, 12VOUT @ 150mA

reference details image

DC230A-D

LT1533CS | Ultra Low Noise Bipolar Output DC/DC Converter, 5VIN to +/-5VOUT @ 350mA, VIN min.= 4.5V, 1.8W Output

reference details image

DC230A-A

LT1533CS | Ultra Low Noise Bipolar Output DC/DC Converter, 5VIN to +/-12VOUT @ 150mA, VIN min.=4.5V, 1.8W Output

reference details image

DC230A-C

LT1533CS | Ultra Low Noise Bipolar Output DC/DC Converter, 5VIN to +/-15VOUT @ 120mA, VIN min.=4.5V, 1.8W Output

Tools & Simulations 1

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.

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