LT3579
6A Boost/Inverting DC/DC Converter with Fault Protection
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Overview
Features and Benefits
- 6A, 42V Combined Power Switch
- Output Short Circuit Protection
- Wide Input Range: 2.5V to 16V Operating, 40V Maximum Transient
- LT3579-1: Dual-Phase Capable
- Master/Slave (3.4A/2.6A) Switch Design
- User Configurable Undervoltage Lockout
- Easily Configurable as a Boost, SEPIC, Inverting, or
- Flyback Converter
- Low VCESAT Switch: 250mV at 5.5A (Typical)
- Can Be Synchronized to External Clock
- Can Synchronize other Switching Regulators
- High Gain SHDN Pin Accepts Slowly Varying Input Signals
- 20-Lead TSSOP and 20-Pin 4mm × 5mm QFN Packages
Product Details
The LT3579 is a PWM DC/DC converter with built-in fault protection features to aid in protecting against output shorts, input/output overvoltage, and overtemperature conditions. The part consists of a 42V master switch, and a 42V slave switch that can be tied together for a total current limit of 6A.
The LT3579 is ideal for many local power supply designs. It can be easily configured in Boost, SEPIC, Inverting, or Flyback configurations, and is capable of generating 12V at 1.7A, or –12V at 1.2A from a 5V input. In addition, the LT3579’s slave switch allows the part to be configured in high voltage, high power charge pump topologies that are very efficient and require fewer components than traditional circuits.
The LT3579’s switching frequency range can be set between 200kHz and 2.5MHz. The part may be clocked internally at a frequency set by the resistor from the RT pin to ground, or it may be synchronized to an external clock. A buffered version of the clock signal is driven out of the CLKOUT pin, and may be used to synchronize other compatible switching regulator ICs to the LT3579.
The LT3579 also features innovative SHDN pin circuitry that allows for slowly varying input signals and an adjustable undervoltage lockout function. Additional features such as frequency foldback and soft-start are integrated. The LT3579 is available in 20-lead TSSOP and 20-pin 4mm × 5mm QFN packages.
Applications
- Local Power Supply
- Vacuum Fluorescent Display (VFD) Bias Supplies
- TFT-LCD Bias Supplies
- Automotive Engine Control Unit (ECU) Power
Product Lifecycle
Recommended for New Designs
This product has been released to the market. The data sheet contains all final specifications and operating conditions. For new designs, ADI recommends utilization of these products.
Evaluation Kits (2)
Documentation & Resources
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R530 Reliability Data3/26/2018PDF20 K
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DC1661A - Demo Manual3/23/2011PDF464K
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DC1514A - Demo Manual3/14/2011PDF561K
Tools & Simulations
LTspice
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:
LT3579
LT3579-1
Design Resources
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.
PCN-PDN Information
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Support & Discussions
LT3579 Discussions
RE: LT3579 synchronization for positive and negative voltages?
12 week(s) ago in Power Management
Sample & Buy
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Evaluation Boards
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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.