LT3956
LT3956
PRODUCTION80VIN, 80VOUT Constant-Current, Constant-Voltage Converter
- Part Models
- 4
- 1ku List Price
- Starting From $5.31
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Overview
- 3000:1 True Color PWM™ Dimming
- Wide Input Voltage Range: 4.5V to 80V
- Output Voltage Up to 80V
- Internal 3.3A/84V Switch
- Constant-Current and Constant-Voltage Regulation
- 250mV High Side Current Sense
- Drives LEDs in Boost, Buck Mode, Buck-Boost Mode, SEPIC or Flyback Topology
- Adjustable Frequency: 100kHz to 1MHz
- Open LED Protection
- Programmable Undervoltage Lockout with Hysteresis
- Constant-Voltage Loop Status Pin
- PWM Disconnect Switch Driver
- CTRL Pin Adjusts High Side Current Sense Threshold
- Low Shutdown Current: <1μA
- Programmable Soft-Start
- Available in the 36-Lead (5mm × 6mm) QFN Package
The LT3956 is a DC/DC converter designed to operate as a constant-current source and constant-voltage regulator. It is ideally suited for driving high current LEDs. It features an internal low side N-channel power MOSFET rated for 84V at 3.3A and driven from an internal regulated 7.15V supply. The fixed frequency, current-mode architecture results in stable operation over a wide range of supply and output voltages. A ground referenced voltage FB 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 LT3956 senses output current at the high side of the LED string. High side current sensing is the most flexible scheme for driving LEDs, allowing boost, buck mode or buck-boost mode configuration. The PWM input provides LED dimming ratios of up to 3000:1, and the CTRL input provides additional analog dimming capability.
Applications
- High Power LED
- Battery Charger
- Accurate Current Limited Voltage Regulator
Documentation
Data Sheet 1
User Guide 1
Application Note 1
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 |
|---|---|---|---|
| LT3956EUHE#PBF | 36-Lead QFN (5mm x 6mm x 0.75mm w/ EP) | ||
| LT3956EUHE#TRPBF | 36-Lead QFN (5mm x 6mm x 0.75mm w/ EP) | ||
| LT3956IUHE#PBF | 36-Lead QFN (5mm x 6mm x 0.75mm w/ EP) | ||
| LT3956IUHE#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
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Tools & Simulations
LTspice 1
Models for the following parts are available in LTspice:
- LT3956
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
LT3956UHE Demo Board | 80VIN, 80VOUT Constant-Current, Constant-Voltage Converter