LT3581
RECOMMENDED FOR NEW DESIGNS3.3A Boost/Inverting DC/DC Converter with Fault Protection
- Part Models
- 10
- 1ku List Price
- Starting From $2.95
Part Details
- 3.3A, 42V Combined Power Switch
- Master/Slave (1.9A/1.4A) Switch Design
- Output Short Circuit Protection
- Wide Input Range: 2.5V to 22V Operating, 40V Maximum Transient
- Switching Frequency Up to 2.5MHz
- Easily Configurable as a Boost, SEPIC, Inverting or Flyback Converter
- User Configurable Undervoltage Lockout
- Low VCESAT Switch: 250mV at 2.75A (Typical)
- Can be Synchronized to External Clock
- Can Be Synchronized to other Switching Regulators
- High Gain SHDN Pin Accepts Slowly Varying Input Signals
- 14-Pin 4mm × 3mm DFN and 16-Lead MSE Packages
The LT3581 is a PWM DC/DC converter with built-in fault protection features to aid in protecting against output shorts, input/output overvoltages, 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 3.3A.
The LT3581 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 830mA, or –12V at 625mA from a 5V input. In addition, the LT3581’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 LT3581’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 LT3581.
The LT3581 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 LT3581 is available in 14-Pin 4mm × 3mm DFN and 16-Lead MSE 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
Reliability Data 1
User Guide 1
Application Note 2
Technical Articles 3
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 |
|---|---|---|---|
| LT3581EDE#PBF | 14-Lead DFN (4mm x 3mm w/ EP) | ||
| LT3581EDE#TRPBF | 14-Lead DFN (4mm x 3mm w/ EP) | ||
| LT3581EMSE#PBF | 16-Lead MSOP w/ EP | ||
| LT3581EMSE#TRPBF | 16-Lead MSOP w/ EP | ||
| LT3581HDE#PBF | 14-Lead DFN (4mm x 3mm w/ EP) | ||
| LT3581HDE#TRPBF | 14-Lead DFN (4mm x 3mm w/ EP) | ||
| LT3581IDE#PBF | 14-Lead DFN (4mm x 3mm w/ EP) | ||
| LT3581IDE#TRPBF | 14-Lead DFN (4mm x 3mm w/ EP) | ||
| LT3581IMSE#PBF | 16-Lead MSOP w/ EP | ||
| LT3581IMSE#TRPBF | 16-Lead MSOP w/ EP |
| Part Models | Product Lifecycle | PCN |
|---|---|---|
|
Feb 20, 2022 - 21_0269 Addition of Alternate Assembly Site ASE Taiwan for Select LFCSP Products |
||
| LT3581EDE#PBF | PRODUCTION | |
| LT3581EDE#TRPBF | PRODUCTION | |
| LT3581HDE#PBF | PRODUCTION | |
| LT3581HDE#TRPBF | PRODUCTION | |
| LT3581IDE#PBF | PRODUCTION | |
| LT3581IDE#TRPBF | PRODUCTION | |
|
Oct 11, 2022 - 22_0244 Epoxy Change from Henkel 8290 to 8290A for MSOP Package |
||
| LT3581EMSE#PBF | PRODUCTION | |
| LT3581EMSE#TRPBF | PRODUCTION | |
| LT3581IMSE#PBF | PRODUCTION | |
| LT3581IMSE#TRPBF | PRODUCTION | |
|
Feb 4, 2020 - 20_0132 Laser Top Mark for 16-Lead MSOP Packages Assembled in ADPG and UTAC |
||
| LT3581EMSE#PBF | PRODUCTION | |
| LT3581EMSE#TRPBF | PRODUCTION | |
| LT3581IMSE#PBF | PRODUCTION | |
| LT3581IMSE#TRPBF | PRODUCTION | |
This is the most up-to-date revision of the Data Sheet.
Software Resources
Can't find the software or driver you need?
Request a Driver/SoftwareHardware Ecosystem
| Parts | Product Life Cycle | Description |
|---|---|---|
| Surge Stopper, Overvoltage, and Overcurrent Protection 1 | ||
| LTC4365 | RECOMMENDED FOR NEW DESIGNS | Overvoltage, Undervoltage and Reverse Supply Protection Controller |
Tools & Simulations
LTspice 1
Models for the following parts are available in LTspice:
- LT3581
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.
