Products
LT3955
PRODUCTION60VIN LED Converter with Internal PWM Generator
- Part Models
- 4
- 1ku List Price
- Starting From $5.15
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Overview
- 3000:1 True Color PWM™ Dimming for LEDs
- Wide VIN Range: 4.5V to 60V
- Rail-to-Rail Current Sense Range: 0V to 80V
- Internal 80V/3.5A Switch
- Programmable PWM Dimming Signal Generator
- Constant Current (±3%) and Constant-Voltage (±2%) Regulation
- Accurate Analog Dimming
- Drives LEDs in Boost, SEPIC, CUK, Buck Mode, Buck-Boost Mode, or Flyback Configuration
- Output Short-Circuit Protected Boost
- Open LED Protection and Reporting
- Adjustable Switching Frequency: 100kHz to 1MHz
- Programmable VIN UVLO with Hysteresis
- C/10 Indication for Battery Chargers
- Low Shutdown Current: <1μA
- Thermally Enhanced 5mm × 6mm QFN Package
The LT3955 is a DC/DC converter designed to operate as a constant-current source and constant-voltage regulator. It features an internal low side N-channel MOSFET rated for 80V/3.5A. The LT3955 is ideally suited for driving high current LEDs, but also has features to make it suitable for charging batteries and supercapacitors. The fixed frequency, current mode architecture results in stable operation over a wide range of supply and output voltages. A voltage feedback pin serves as the input for several LED protection features, and also makes it possible for the converter to operate as a constant-voltage source. A frequency adjust pin allows the user to program the frequency from 100kHz to 1MHz to optimize efficiency, performance or external component size.
The LT3955 senses output current at the high side or at the low side of the load. The PWM input can be configured to self-oscillate at fixed frequency with duty ratio programmable from 4% to 96%. When driven by an external signal, the PWM input provides LED dimming ratios of up to 3000:1. The CTRL input provides additional analog dimming capability.
Applications
- High Power LEDs
- Output Short-Circuit Protected Boost
- Battery and SuperCap Chargers
- Accurate Current Limited Voltage Regulators
Documentation
Data Sheet 1
User Guide 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 |
|---|---|---|---|
| LT3955EUHE#PBF | 36-Lead QFN (5mm x 6mm x 0.75mm w/ EP) | ||
| LT3955EUHE#TRPBF | 36-Lead QFN (5mm x 6mm x 0.75mm w/ EP) | ||
| LT3955IUHE#PBF | 36-Lead QFN (5mm x 6mm x 0.75mm w/ EP) | ||
| LT3955IUHE#TRPBF | 36-Lead QFN (5mm x 6mm x 0.75mm w/ EP) |
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 |
|---|---|---|
| Protection Switches & Controllers 2 | ||
| LT4363 | RECOMMENDED FOR NEW DESIGNS | High Voltage Surge Stopper with Current Limit |
|
LT4320 LT4320-1 |
Ideal Diode Bridge Controller | |
Tools & Simulations
LTspice 1
Models for the following parts are available in LTspice:
- LT3955
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
LT3955EUHE Demo Board | Boost LED Driver; 5V to 60VIN, VOUT up to 67V @ 0.3A