Step-Down (Buck) LED Drivers
Analog Devices step-down (buck) LED drivers are ideal for applications where the input voltage is above the LED voltage, as in many automotive or industrial applications. These LED drivers offer the highest efficiency, lowest noise, and the smallest footprints. Other features include integrated Schottky diodes, accurate LED current matching, and multiple output capability.
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LT Journal
- Synchronous, Low EMI LED Driver Features Integrated Switches and Internal PWM Dimming PDF
- 42V High Power Density Buck Regulators in a Tiny QFN Package PDF
- 20A LED Driver with Accurate ±3% Full Scale Current Sensing Adapts to Multitude of Applications PDF
- One LED Driver Is All You Need for Automotive LED Headlight Clusters (LT3795) PDF
- Can’t Find the Right Synchronous Boost LED Driver? Use a Synchronous Buck Converter Instead: Boost Mode Topology Drives 25V, 3A LEDs from 12V PDF
- Boost-Buck LED Driver Topology for Automotive LEDs Operates with Low Input and Output Ripple (LT3952) PDF
- Boost-then‑Buck LED Drivers Enable Wide PWM Dimming Range with Wide-Ranging Input Voltages (LT3797) PDF
- LED Controller with Dual Current Regulation Loops Detects Faulty LEDs, Provides 100:1 Analog Dimming PDF
- LED Driver with Integrated Spread Spectrum Reduces EMI without Adding Flicker (LT3795) PDF
- High Power Controller Drives High Power LEDs, Regulates Solar Cells, and Charges Batteries, Steps Down 60V Inputs PDF
- Accurate PWM LED Dimming without External Signal Generators, Clocks or µControllers PDF
- Combined Voltage and Current Control Loops Simplify LED Drivers, High Capacity Battery/Supercap Chargers & MPPT* Solar Applications PDF
- Two Wide Input Range Monolithic Switching Regulators Make it Easy to Fit Boost, Flyback, SEPIC and Inverting Topologies into Tight Spaces PDF
- January 2009 - 100V Controller in 3mm × 3mm QFN or MSE Drives High Power LED Strings from Just About Any Input PDF
- April 2010 - 140W Monolithic Switching Regulator Simplifies Constant-Current/Constant-Voltage Regulation PDF
- September 2009 - 4W LED Driver Includes Power Switch, Compensation Components and Schottky in 16-Pin MSOP PDF
- September 2009 - uModule LED Driver Integrates All Circuitry, Including the Inductor, in a Surface Mount Package PDF
- June 2009 - Triple Output LED Driver Works with Inputs to 60V and Delivers 3000:1 PWM Dimming PDF
- December 2009 - High Current/High Speed LED Driver Revolutionizes PWM Dimming PDF
- March 2009 - Don’t Want to Hear It? Avoid the Audio Band with PWM LED Dimming at Frequencies Above 20kHz PDF
- June 2008 - No PWM Signal Needed for Accurate Dim/Bright Control of Automotive Brake Lights and Other Signal LEDs PDF
- Jan 2008 - Efficient 48V Buck Mode LED Driver Delivers 50mA PDF
- Oct 2007 -LED Driver Yields 3000:1 True Color PWM Dimming with Any Buck, Boost or Buck-Boost Topology from a Wide 3V–40V Input Range PDF
- Accurate Constant-Current, Constant-Voltage 20A Power Supply Ensures Safe Charging of Supercaps and Li-Ion Batteries
Technical Articles
- High Efficiency Solar MPPT Battery Charger Using LT8611 and AD5245
- 95% Efficient at 2MHz 42V Synchronous Buck
- 36V, 2A LED Driver with 5000:1 PWM Dimming Meets CISPR 25 Class 5 EMI Limits with Silent Switcher Architecture
- Low EMI LED Driver Features 2A, 40V, Integrated, Synchronous Switches for Automotive Lighting
- 3A, 1MHz Buck Mode LED Driver with Integrated Voltage Limiting
- 42V High Power Density Buck Regulators in a Tiny QFN Package
- Spread Spectrum Frequency Modulation Reduces EMI
- 60V, Synchronous Step-Down High Current LED Driver
Videos
- Low EMI LED Driver with Synchronous Internal 2A Switches
- High Current LED Driver with Three-State Control For Color Mixing - LT3743
- LT3592 Video Product Brief
- LT3956 Video Product Brief
- LT3743 Video Product Brief
- Spread Spectrum Frequency Modulation Reduces Automotive LED Driver EMI
- High Power Three-Channel LED Driver (LT3797)
- 60V 8-Switch Matrix LED Dimmer (LT3965)
- 60V LED Driver with Internal 4A Switch for Automotive Lighting (LT3952)
Design Notes
- DN570 - 36V, 2A LED Driver with 5000:1 PWM Dimming Meets CISPR 25 Class 5 EMI Limits with Silent Switcher Architecture PDF
- DN557 - Low EMI LED Driver Features 2A, 40V, Integrated, Synchronous Switches for Automotive Lightin PDF
- DN556 - 3A, 1MHz Buck Mode LED Driver with Integrated Voltage Limiting PDF
- DN1038 - 42V High Power Density Buck Regulators in a Tiny QFN Package PDF
- DN376 - Monolithic Converter Drives High Power LEDs PDF
- DN340 - DC/DC Converter Drives Lumileds White LEDs from a Variety of Power Sources PDF
- DN252 - Current-Limited DC/DC Converter Simplifies USB Power Supplies PDF
- DN508 - 60V, Synchronous Step-Down High Current LED Driver PDF
- DN504 - 42V, 2.5A Synchronous Step-Down Regulator with 2.5μA Quiescent Current PDF
- DN445 - uModule LED Driver Integrates All Circuitry, Including the Inductor, in a Surface Mount Package PDF
- DN461 - 100V Controller Drives High Power LED Strings from Just about Any Input PDF
- DN449 - Triple LED Driver in 4mm × 5mm QFN Supports LCD Backlights in Buck, Boost or Buck-Boost Modes and Delivers 3000:1 PWM Dimming Ratio PDF
- DN1009 - Tiny, Efficient High Power LED Camera Flash Solutions for Cell Phone Applications PDF
- DN392 - High Voltage Buck Converters Drive High Power LEDs PDF
- DN388 - Wide Input Range 1A LED Driver Powers High Brightness LEDs with Automotive and 12VAC Supplies PDF
Step-Down (Buck) LED Drivers
| SortOrder | Part# | Number of Outputs | Vin (min) (V) | Vin (max) (V) | Output Current (typ) (A) | Vout Max (typ) (V) | Topology | Monolithic | Price (1000+) ($ US) |
|---|---|---|---|---|---|---|---|---|---|
| 1 | LT3922-1 | 1 | 2.8 | 36 | 2 | 40 | Boost, Buck, Buck-Boost | Yes | $2.71 (LT3922EUFD-1#PBF) |
| 2 | LT3964 | 2 | 4 | 36 | 1.6 | 35.64 | Buck, LED Driver | Yes | $4.50 (LT3964EUHE#PBF) |
| 3 | LT3932 | 1 | 3.6 | 36 | 2 | 36 | Buck, LED Driver | Yes | $2.71 (LT3932EUFD#PBF) |
| 4 | LT3922 | 1 | 2.8 | 36 | 2 | 40 | Boost, Buck, Buck-Boost | Yes | $2.71 (LT3922EUFD#PBF) |
| 5 | LT3761A | 1 | 4.5 | 60 | 10 | 100 | Boost, Buck, Buck-Boost, LED Driver, Sepic | No | $3.20 (LT3761AEMSE#PBF) |
| 6 | LT3761 | 1 | 4.5 | 60 | 10 | 100 | Boost, Buck, Buck-Boost, LED Driver, Sepic | No | $3.20 (LT3761EMSE#PBF) |
| 7 | LT3952 | 1 | 3 | 42 | 4 | 60 | Boost, Buck, Buck-Boost, LED Driver | Yes | $3.95 (LT3952EFE#PBF) |
| 8 | LT3744 | 1 | 3.3 | 36 | 40 | 36 | Buck, LED Driver | No | $3.95 (LT3744EUHE#PBF) |
| 9 | LT8613 | 1 | 3.4 | 42 | 6 | 41.58 | Buck | Yes | $5.20 (LT8613EUDE#PBF) |
| 10 | LT3795 | 1 | 4.5 | 110 | 10 | 110 | Boost, Buck, Buck-Boost, LED Driver, Sepic | No | $3.45 (LT3795EFE#PBF) |
| 11 | LT3797 | 3 | 2.5 | 40 | 5 | 100 | Boost, Buck, Buck-Boost, LED Driver, Sepic | No | $4.95 (LT3797ELXE#PBF) |
| 12 | LT3763 | 1 | 6 | 60 | 20 | 55 | Buck, LED Driver | No | $2.28 (LT3763EFE#PBF) |
| 13 | LT8611 | 1 | 3.4 | 42 | 2.5 | 40 | Buck | Yes | $3.80 (LT8611EUDD#PBF) |
| 14 | LT3745-1 | 16 | 6 | 55 | 75m | 36 | Buck, LED Driver | Yes | $4.95 (LT3745EUJ-1#PBF) |
| 15 | LT3796 | 1 | 6 | 100 | 10 | 100 | Boost, Buck, Buck-Boost, LED Driver, Sepic | No | $3.45 (LT3796EFE#PBF) |
| 16 | LT3745 | 16 | 6 | 55 | 75m | 36 | Buck, LED Driver | Yes | $4.95 (LT3745EUJ#PBF) |
| 17 | LTM8042-1 | 1 | 3 | 30 | 350m | 32 | Boost, Buck, LED Driver | Yes | $8.76 (LTM8042EV-1#PBF) |
| 18 | LTM8042 | 1 | 3 | 30 | 1 | 32 | Boost, Buck, LED Driver | Yes | $8.76 (LTM8042EV#PBF) |
| 19 | LT3596 | 3 | 6 | 60 | 300m | 60 | Buck, LED Driver | Yes | $3.65 (LT3596EUHG#PBF) |
| 20 | LT3746 | 32 | 6 | 55 | 30m | 13 | Buck, LED Driver | Yes | $4.95 (LT3746EUHH#PBF) |
| 21 | LT3741 | 1 | 6 | 36 | 25 | 34 | Buck, LED Driver | No | $3.95 (LT3741EUF#PBF) |
| 22 | LT3597 | 3 | 6 | 60 | 100m | 57 | Buck, LED Driver | Yes | $3.95 (LT3597EUHG#PBF) |
| 23 | LT3743 | 1 | 6 | 36 | 20 | 30 | Buck, LED Driver | No | $4.80 (LT3743EUFD#PBF) |
| 24 | LT3519 | 1 | 3 | 30 | 500m | 45 | Boost, Buck, Buck-Boost, LED Driver, Sepic | Yes | $2.50 (LT3519EMS#PBF) |
| 25 | LTM8040 | 1 | 4 | 36 | 1 | 13 | Buck, LED Driver | Yes | $7.45 (LTM8040EV#PBF) |
| 26 | LT3956 | 1 | 4.5 | 80 | 1.5 | 80 | Boost, Buck, Buck-Boost, Flyback, LED Driver, Sepic | Yes | $3.50 (LT3956EUHE#PBF) |
| 27 | LT3595A | 16 | 4.5 | 45 | 50m | 45 | Buck, LED Driver | Yes | $6.95 (LT3595AEUHH#PBF) |
| 28 | LT3756 | 1 | 6 | 100 | 10 | 100 | Boost, Buck, Buck-Boost, LED Driver, Sepic | No | $2.90 (LT3756EUD#PBF) |
| 29 | LT3755 | 1 | 4.5 | 40 | 10 | 75 | Boost, Buck, Buck-Boost, LED Driver, Sepic | No | $2.75 (LT3755EUD#PBF) |
| 30 | LT3592 | 1 | 3.6 | 36 | 500m | 36 | Buck, LED Driver | Yes | $1.65 (LT3592EDDB#TRPBF) |
| 31 | LT3492 | 3 | 3 | 30 | 300m | 60 | Boost, Buck, Buck-Boost, LED Driver | Yes | $3.70 (LT3492EUFD#PBF) |
| 32 | LT3517 | 1 | 3 | 30 | 1.25 | 40 | Boost, Buck, Buck-Boost, LED Driver | Yes | $2.70 (LT3517EUF#PBF) |
| 33 | LT3595 | 16 | 4.5 | 45 | 50m | 45 | Buck, LED Driver | Yes | $6.95 (LT3595EUHH#PBF) |
| 34 | LT3590 | 1 | 4.5 | 55 | 50m | 55 | Buck, LED Driver | Yes | $1.40 (LT3590EDC#TRPBF) |
| 35 | LT3518 | 1 | 3 | 30 | 1.86 | 45 | Boost, Buck, Buck-Boost, LED Driver | Yes | $2.95 (LT3518EUF#PBF) |
| 36 | LT3496 | 3 | 3 | 30 | 700m | 45 | Boost, Buck, Buck-Boost, LED Driver | Yes | $3.50 (LT3496EUFD#PBF) |
| 37 | LT3476 | 4 | 2.8 | 16 | 1 | 36 | Boost, Buck, Buck-Boost, LED Driver | Yes | $4.64 (LT3476EUHF#PBF) |
| 38 | LT3475-1 | 2 | 4 | 36 | 1.5 | 25 | Buck, LED Driver | Yes | $3.50 (LT3475EFE-1#PBF) |
| 39 | LT3475 | 2 | 4 | 36 | 1.5 | 15 | Buck, LED Driver | Yes | $3.50 (LT3475EFE#PBF) |
| 40 | LT3478 | 1 | 2.8 | 36 | 4.2 | 42 | Boost, Buck, Buck-Boost, LED Driver | Yes | $3.60 (LT3478EFE#PBF) |
| 41 | LT3474-1 | 1 | 4 | 36 | 1 | 26 | Buck, LED Driver | Yes | $2.95 (LT3474EFE-1#PBF) |
| 42 | LT3474 | 1 | 4 | 36 | 1 | 15 | Buck, LED Driver | Yes | $2.95 (LT3474EFE#PBF) |
| 43 | LT3477 | 1 | 2.3 | 25 | 2.66 | 40 | Boost, Buck, Buck-Boost, LED Driver | Yes | $3.15 (LT3477EUF#PBF) |
| 44 | AD8240 | 1 | 9 | 27 | - | - | - | - | $1.29 (AD8240YRMZ) |
| 45 | LT1618 | 1 | 1.6 | 18 | 1 | 36 | Boost, Flyback, Sepic | Yes | $1.75 (LT1618EDD#PBF) |
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