LT3579
RECOMMENDED FOR NEW DESIGNS6A Boost/Inverting DC/DC Converter with Fault Protection
- Part Models
- 16
- 1ku List Price
- Starting From $5.01
Overview
- 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
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
Documentation
Data Sheet 1
User Guide 2
Technical Articles 1
Video 1
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 Model | Pin/Package Drawing | Documentation | CAD Symbols, Footprints, and 3D Models |
|---|---|---|---|
| LT3579EFE#PBF | 20-Lead TSSOP w/ EP | ||
| LT3579EFE#TRPBF | 20-Lead TSSOP w/ EP | ||
| LT3579EFE-1#PBF | 20-Lead TSSOP w/ EP | ||
| LT3579EFE-1#TRPBF | 20-Lead TSSOP w/ EP | ||
| LT3579EUFD#PBF | 20-Lead QFN (4mm x 5mm x 0.75mm w/ EP) | ||
| LT3579EUFD#TRPBF | 20-Lead QFN (4mm x 5mm x 0.75mm w/ EP) | ||
| LT3579EUFD-1#PBF | 20-Lead QFN (4mm x 5mm x 0.75mm w/ EP) | ||
| LT3579EUFD-1#TRPBF | 20-Lead QFN (4mm x 5mm x 0.75mm w/ EP) | ||
| LT3579IFE#PBF | 20-Lead TSSOP w/ EP | ||
| LT3579IFE#TRPBF | 20-Lead TSSOP w/ EP | ||
| LT3579IFE-1#PBF | 20-Lead TSSOP w/ EP | ||
| LT3579IFE-1#TRPBF | 20-Lead TSSOP w/ EP | ||
| LT3579IUFD#PBF | 20-Lead QFN (4mm x 5mm x 0.75mm w/ EP) | ||
| LT3579IUFD#TRPBF | 20-Lead QFN (4mm x 5mm x 0.75mm w/ EP) | ||
| LT3579IUFD-1#PBF | 20-Lead QFN (4mm x 5mm x 0.75mm w/ EP) | ||
| LT3579IUFD-1#TRPBF | 20-Lead QFN (4mm x 5mm x 0.75mm w/ EP) |
| Part Models | Product Lifecycle | PCN |
|---|---|---|
|
May 18, 2026 - 26_0072 Epoxy Change for Select TSSOP Products |
||
| LT3579EFE#PBF | PRODUCTION | |
| LT3579EFE#TRPBF | PRODUCTION | |
| LT3579EFE-1#PBF | PRODUCTION | |
| LT3579EFE-1#TRPBF | PRODUCTION | |
| LT3579IFE#PBF | PRODUCTION | |
| LT3579IFE#TRPBF | PRODUCTION | |
| LT3579IFE-1#PBF | PRODUCTION | |
| LT3579IFE-1#TRPBF | PRODUCTION | |
|
Feb 14, 2025 - 25_0016 Bond Wire Change from Gold to Copper Wire (Notification Only) |
||
| LT3579EFE#PBF | PRODUCTION | |
| LT3579EFE#TRPBF | PRODUCTION | |
| LT3579EFE-1#PBF | PRODUCTION | |
| LT3579EFE-1#TRPBF | PRODUCTION | |
| LT3579EUFD#PBF | PRODUCTION | |
| LT3579EUFD#TRPBF | PRODUCTION | |
| LT3579EUFD-1#PBF | PRODUCTION | |
| LT3579EUFD-1#TRPBF | PRODUCTION | |
| LT3579IFE#PBF | PRODUCTION | |
| LT3579IFE#TRPBF | PRODUCTION | |
| LT3579IFE-1#PBF | PRODUCTION | |
| LT3579IFE-1#TRPBF | PRODUCTION | |
|
Apr 6, 2022 - 22_0068 Laser Top Mark for ETSSOP and TSSOP Packages Assembled in ADPG [PNG] and UTL |
||
| LT3579EFE#PBF | PRODUCTION | |
| LT3579EFE#TRPBF | PRODUCTION | |
| LT3579EFE-1#PBF | PRODUCTION | |
| LT3579EFE-1#TRPBF | PRODUCTION | |
| LT3579IFE#PBF | PRODUCTION | |
| LT3579IFE#TRPBF | PRODUCTION | |
| LT3579IFE-1#PBF | PRODUCTION | |
| LT3579IFE-1#TRPBF | PRODUCTION | |
|
Apr 9, 2025 - 25_0016 Bond Wire Change from Gold to Copper Wire (Notification Only) |
||
| LT3579IUFD#PBF | PRODUCTION | |
| LT3579IUFD#TRPBF | PRODUCTION | |
This is the most up-to-date revision of the Data Sheet.
Software Resources
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Request a Driver/SoftwareTools & Simulations
LTspice 1
Models for the following parts are available in LTspice:
- LT3579
- LT3579-1
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.
Evaluation Kits
LT3579EFE/LT3579EFE-1 Demo Board | 2 Paralleled LT3579's, 5V ≤ VIN ≤ 10V, VOUT = 12V @ 3.5A
Resources
LT3579EFE/LT3579EFE-1 Demo Board | 2 Paralleled LT3579's, 5V ≤ VIN ≤ 10V, VOUT = 12V @ 3.5A
Resources
LT3579EFE Demo Board | 5V ≤ VIN ≤ 10V, VOUT = 12V @ 1.75A, Fault Protection
Resources
LT3579EFE Demo Board | 5V ≤ VIN ≤ 10V, VOUT = 12V @ 1.75A, Fault Protection