LT3474
LT3474
LT3474-1
PRODUCTION
Step-Down 1A LED Driver
- Part Models
- 8
- 1ku List Price
- Starting From $4.48
Viewing:
Overview
- True Color PWM™ Delivers Constant Color with 400:1 Dimming Range
- Wide Input Range: 4V to 36V
- Up to 1A LED Current
- Adjustable 200kHz–2MHz Switching Frequency
- Adjustable Control of LED Current
- Integrated Boost Diode
- High Output Current Accuracy is Maintained Over a Wide Range from 35mA to 1A
- Open LED (LT3474) and Short-Circuit Protection
- High Side Sense Allows Grounded Cathode Connection
- Uses Small Inductors and Ceramic Capacitors
- LT3474-1 Drives LED Strings Up to 26V
- Compact 16-Lead TSSOP Thermally Enhanced Surface Mount Package
The LT3474/LT3474-1 are fixed frequency step-down DC/DC converters designed to operate as constant-current sources. An internal sense resistor monitors the output current allowing accurate current regulation, ideal for driving high current LEDs. High output current accuracy is maintained over a wide current range, from 35mA to 1A, allowing a wide dimming range.
Unique PWM circuitry allows a dimming range of 400:1, avoiding the color shift normally associated with LED current dimming.
The high switching frequency offers several advantages, permitting the use of small inductors and ceramic capacitors. Small inductors combined with the 16 lead TSSOP surface mount package save space and cost versus alternative solutions. The constant switching frequency combined with low-impedance ceramic capacitors result in low, predictable output ripple.
With their wide input range of 4V to 36V, the LT3474/ LT3474-1 regulate a broad array of power sources, from 5V logic rails to unregulated wall transformers, lead acid batteries and distributed power supplies. A current mode PWM architecture provides fast transient response and cycle-by-cycle current limiting. Frequency foldback and thermal shutdown provide additional protection.
Applications
- Automotive and Avionic Lighting
- Architectural Detail Lighting
- Display Backlighting
- Constant Current Sources
Documentation
Data Sheet 1
User Guide 2
Design Note 3
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 |
|---|---|---|---|
| LT3474EFE#PBF | 16-Lead TSSOP w/ EP | ||
| LT3474EFE#TRPBF | 16-Lead TSSOP w/ EP | ||
| LT3474EFE-1#PBF | 16-Lead TSSOP w/ EP | ||
| LT3474EFE-1#TRPBF | 16-Lead TSSOP w/ EP | ||
| LT3474IFE#PBF | 16-Lead TSSOP w/ EP | ||
| LT3474IFE#TRPBF | 16-Lead TSSOP w/ EP | ||
| LT3474IFE-1#PBF | 16-Lead TSSOP w/ EP | ||
| LT3474IFE-1#TRPBF | 16-Lead TSSOP w/ EP |
| Part Models | Product Lifecycle | PCN |
|---|---|---|
|
Apr 6, 2022 - 22_0068 Laser Top Mark for ETSSOP and TSSOP Packages Assembled in ADPG [PNG] and UTL |
||
| LT3474EFE#PBF | PRODUCTION | |
| LT3474EFE#TRPBF | PRODUCTION | |
| LT3474EFE-1#PBF | PRODUCTION | |
| LT3474EFE-1#TRPBF | PRODUCTION | |
| LT3474IFE#PBF | PRODUCTION | |
| LT3474IFE#TRPBF | PRODUCTION | |
| LT3474IFE-1#PBF | PRODUCTION | |
| LT3474IFE-1#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 | ||
| LT2940 | PRODUCTION | Power and Current Monitor |
| Hot Swap Controllers 1 | ||
| LT4363 | RECOMMENDED FOR NEW DESIGNS | High Voltage Surge Stopper with Current Limit |
| Pulse-Width Modulation (PWM) & Pulse Generators 1 | ||
| LTC6992 | TimerBlox: Voltage-Controlled Pulse Width Modulator (PWM) | |
| Temperature Sensors 1 | ||
| LTC2995 | PRODUCTION | Temperature Sensor and Dual Voltage Monitor with Alert Outputs |
Tools & Simulations
LTspice 1
Models for the following parts are available in LTspice:
- LT3474
- LT3474-1
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.
