LT3431
PRODUCTIONHigh Voltage, 3A, 500kHz Step-Down Switching Regulator
- Part Models
- 4
- 1ku List Price
- Starting From $8.32
Overview
- Wide Input Range: 5.5V to 60V
- 3A Peak Switch Current
- Small Thermally Enhanced 16-Pin TSSOP Package
- Constant 500kHz Switching Frequency
- Saturating Switch Design: 0.1Ω
- Peak Switch Current Maintained Over Full Duty Cycle Range
- Effective Supply Current: 2.5mA
- Shutdown Current: 30µA
- 1.2V Feedback Reference Voltage
- Easily Synchronizable
- Cycle-by-Cycle Current Limiting
The LT3431 is a 500kHz monolithic buck switching regulator that accepts input voltages up to 60V. A high efficiency 3A, 0.1Ω switch is included on the die along with all the necessary oscillator, control and logic circuitry. A current mode architecture provides fast transient response and good loop stability.
Special design techniques and a new high voltage process achieve high efficiency over a wide input range. Efficiency is maintained over a wide output current range by using the output to bias the circuitry and by utilizing a supply boost capacitor to saturate the power switch. Patented circuitry maintains peak switch current over the full duty cycle range. A shutdown pin reduces supply current to 30µA and the device can be externally synchronized from 580kHz to 700kHz with logic level inputs.
The LT3431 is available in a thermally enhanced 16-pin TSSOP package.
Applications
- Industrial and Automotive Power Supplies
- Portable Computers
- Battery Chargers
- Distributed Power Systems
Documentation
Data Sheet 1
User Guide 1
Design Note 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 |
|---|---|---|---|
| LT3431EFE#PBF | 16-Lead TSSOP w/ EP | ||
| LT3431EFE#TRPBF | 16-Lead TSSOP w/ EP | ||
| LT3431IFE#PBF | 16-Lead TSSOP w/ EP | ||
| LT3431IFE#TRPBF | 16-Lead TSSOP w/ EP |
| Part Models | Product Lifecycle | PCN |
|---|---|---|
|
May 18, 2026 - 26_0072 Epoxy Change for Select TSSOP Products |
||
| LT3431EFE#PBF | PRODUCTION | |
| LT3431EFE#TRPBF | PRODUCTION | |
| LT3431IFE#PBF | PRODUCTION | |
| LT3431IFE#TRPBF | PRODUCTION | |
|
Apr 6, 2022 - 22_0068 Laser Top Mark for ETSSOP and TSSOP Packages Assembled in ADPG [PNG] and UTL |
||
| LT3431EFE#PBF | PRODUCTION | |
| LT3431EFE#TRPBF | PRODUCTION | |
| LT3431IFE#PBF | PRODUCTION | |
| LT3431IFE#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 |
|---|---|---|
| Circuit Monitors 1 | ||
| LTC2960 | RECOMMENDED FOR NEW DESIGNS | 36V Nano-Current Two-Input Voltage Monitor |
| Hot Swap Controllers 1 | ||
| LT4363 | RECOMMENDED FOR NEW DESIGNS | High Voltage Surge Stopper with Current Limit |
| Oscillators 1 | ||
| LTC6908 | Resistor Set SOT-23 Oscillator with Spread Spectrum Modulation | |
| Power System Management (PSM) & Sequencers 1 | ||
| LTC2974 | RECOMMENDED FOR NEW DESIGNS | 4-Channel PMBus Power System Manager Featuring Accurate Output Current Measurement |
Tools & Simulations
LTspice 1
Models for the following parts are available in LTspice:
- LT3431
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
LT3431EFE Demo Board | 60V Transients, 7.5V ≤ VIN ≤ 20V, VOUT = 5V @ 2A
Resources
Latest Discussions
No discussions on LT3431 yet. Have something to say?
Start a Discussion on EngineerZone®