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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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
Product Selector Card
LT Journal
- Combined Voltage and Current Control Loops Simplify LED Drivers, High Capacity Battery/Supercap Chargers & MPPT* Solar Applications PDF
- September 2009 - uModule LED Driver Integrates All Circuitry, Including the Inductor, in a Surface Mount Package PDF
- December 2009 - High Current/High Speed LED Driver Revolutionizes PWM Dimming PDF
Technical Articles Page
- 36V, 2A LED Driver with 5000:1 PWM Dimming Meets CISPR 25 Class 5 EMI Limits with Silent Switcher Architecture
- High Efficiency Solar MPPT Battery Charger Using LT8611 and AD5245
- Low EMI LED Driver Features 2A, 40V, Integrated, Synchronous Switches for Automotive Lighting
- 3A, 1MHz Buck Mode LED Driver with Integrated Voltage Limiting
- 95% Efficient at 2MHz 42V Synchronous Buck
- 42V High Power Density Buck Regulators in a Tiny QFN Package
- Spread Spectrum Frequency Modulation Reduces EMI
- One LED Driver Is All You Need for Automotive LED Headlight Clusters (LT3795)
- Can’t Find the Right Synchronous Boost LED Driver? Use a Synchronous Buck Converter Instead: Boost Mode Topology Drives 25V, 3A LEDs from 12V
- 60V, Synchronous Step-Down High Current LED Driver
- Accurate Constant-Current, Constant-Voltage 20A Power Supply Ensures Safe Charging of Supercaps and Li-Ion Batteries
- 140W Monolithic Switching Regulator Simplifies Constant-Current/Constant-Voltage Regulation
- No PWM Signal Needed for Accurate Dim/Bright Control of Automotive Brake Lights and Other Signal LEDs
- LED Driver Yields 3000:1 True Color PWM Dimming with Any Buck, Boost or Buck-Boost Topology from a Wide 3V–40V Input Range
Videos
- Low EMI LED Driver with Synchronous Internal 2A Switches
- 60V 8-Switch Matrix LED Dimmer (LT3965)
- 60V LED Driver with Internal 4A Switch for Automotive Lighting (LT3952)
- High Power Three-Channel LED Driver (LT3797)
- LT3956 Video Product Brief
- LT3743 Video Product Brief
- LT3592 Video Product Brief
- High Current LED Driver with Three-State Control For Color Mixing - LT3743
- Spread Spectrum Frequency Modulation Reduces Automotive LED Driver EMI
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 | LT3966 | 4 | 3 | 60 | 120m | 52 | Boost, Buck, Buck-Boost, LED Driver | Yes | $3.95 (LT3966EUJ#PBF) |
| 2 | LT3950 | 1 | 3 | 60 | 1.2 | 60 | Boost, Buck, Buck-Boost, LED Driver, Sepic | Yes | $1.95 (LT3950EMSE#PBF) |
| 3 | LT3952A | 1 | 3 | 42 | 4 | 60 | Boost, Buck, Buck-Boost, LED Driver | Yes | $2.95 (LT3952AEFE#PBF) |
| 4 | LT3964 | 2 | 4 | 36 | 1.6 | 35.64 | Buck, LED Driver | Yes | $4.50 (LT3964EUHE#PBF) |
| 5 | LT3932 | 1 | 3.6 | 36 | 2 | 36 | Buck, LED Driver | Yes | $2.71 (LT3932EUFD#PBF) |
| 6 | LT3922-1 | 1 | 2.8 | 36 | 2 | 40 | Boost, Buck, Buck-Boost | Yes | $2.71 (LT3922EUFD-1#PBF) |
| 7 | LT3922 | 1 | 2.8 | 36 | 2 | 40 | Boost, Buck, Buck-Boost | Yes | $2.71 (LT3922EUFD#PBF) |
| 8 | LT3761A | 1 | 4.5 | 60 | 10 | 100 | Boost, Buck, Buck-Boost, LED Driver, Sepic | No | $3.20 (LT3761AEMSE#PBF) |
| 9 | LT3761 | 1 | 4.5 | 60 | 10 | 100 | Boost, Buck, Buck-Boost, LED Driver, Sepic | No | $3.20 (LT3761EMSE#PBF) |
| 10 | LT3744 | 1 | 3.3 | 36 | 40 | 36 | Buck, LED Driver | No | $3.95 (LT3744EUHE#PBF) |
| 11 | LT8613 | 1 | 3.4 | 42 | 6 | 41.58 | Buck | Yes | $5.20 (LT8613EUDE#PBF) |
| 12 | LT3795 | 1 | 4.5 | 110 | 10 | 110 | Boost, Buck, Buck-Boost, LED Driver, Sepic | No | $3.45 (LT3795EFE#PBF) |
| 13 | LT3797 | 3 | 2.5 | 40 | 5 | 100 | Boost, Buck, Buck-Boost, LED Driver, Sepic | No | $4.95 (LT3797ELXE#PBF) |
| 14 | LT3763 | 1 | 6 | 60 | 20 | 55 | Buck, LED Driver | No | $2.28 (LT3763EFE#PBF) |
| 15 | LT8611 | 1 | 3.4 | 42 | 2.5 | 40 | Buck | Yes | $3.80 (LT8611EUDD#PBF) |
| 16 | LT3745-1 | 16 | 6 | 55 | 75m | 36 | Buck, LED Driver | Yes | $4.95 (LT3745EUJ-1#PBF) |
| 17 | LT3796 | 1 | 6 | 100 | 10 | 100 | Boost, Buck, Buck-Boost, LED Driver, Sepic | No | $3.45 (LT3796EFE#PBF) |
| 18 | LT3745 | 16 | 6 | 55 | 75m | 36 | Buck, LED Driver | Yes | $4.95 (LT3745EUJ#PBF) |
| 19 | LTM8042-1 | 1 | 3 | 30 | 350m | 32 | Boost, Buck, LED Driver | Yes | $8.76 (LTM8042EV-1#PBF) |
| 20 | LTM8042 | 1 | 3 | 30 | 1 | 32 | Boost, Buck, LED Driver | Yes | $8.76 (LTM8042EV#PBF) |
| 21 | LT3596 | 3 | 6 | 60 | 300m | 60 | Buck, LED Driver | Yes | $3.65 (LT3596EUHG#PBF) |
| 22 | LT3746 | 32 | 6 | 55 | 30m | 13 | Buck, LED Driver | Yes | $4.95 (LT3746EUHH#PBF) |
| 23 | LT3741 | 1 | 6 | 36 | 25 | 34 | Buck, LED Driver | No | $3.95 (LT3741EUF#PBF) |
| 24 | LT3597 | 3 | 6 | 60 | 100m | 57 | Buck, LED Driver | Yes | $3.95 (LT3597EUHG#PBF) |
| 25 | LT3743 | 1 | 6 | 36 | 20 | 30 | Buck, LED Driver | No | $4.80 (LT3743EUFD#PBF) |
| 26 | LT3519 | 1 | 3 | 30 | 500m | 45 | Boost, Buck, Buck-Boost, LED Driver, Sepic | Yes | $2.50 (LT3519EMS#PBF) |
| 27 | LTM8040 | 1 | 4 | 36 | 1 | 13 | Buck, LED Driver | Yes | $7.45 (LTM8040EV#PBF) |
| 28 | LT3956 | 1 | 4.5 | 80 | 1.5 | 80 | Boost, Buck, Buck-Boost, Flyback, LED Driver, Sepic | Yes | $3.50 (LT3956EUHE#PBF) |
| 29 | LT3595A | 16 | 4.5 | 45 | 50m | 45 | Buck, LED Driver | Yes | $6.95 (LT3595AEUHH#PBF) |
| 30 | LT3756 | 1 | 6 | 100 | 10 | 100 | Boost, Buck, Buck-Boost, LED Driver, Sepic | No | $2.90 (LT3756EUD#PBF) |
| 31 | LT3755 | 1 | 4.5 | 40 | 10 | 75 | Boost, Buck, Buck-Boost, LED Driver, Sepic | No | $2.75 (LT3755EUD#PBF) |
| 32 | LT3592 | 1 | 3.6 | 36 | 500m | 36 | Buck, LED Driver | Yes | $1.65 (LT3592EDDB#TRPBF) |
| 33 | LT3492 | 3 | 3 | 30 | 300m | 60 | Boost, Buck, Buck-Boost, LED Driver | Yes | $3.70 (LT3492EUFD#PBF) |
| 34 | LT3517 | 1 | 3 | 30 | 1.25 | 40 | Boost, Buck, Buck-Boost, LED Driver | Yes | $2.70 (LT3517EUF#PBF) |
| 35 | LT3595 | 16 | 4.5 | 45 | 50m | 45 | Buck, LED Driver | Yes | $6.95 (LT3595EUHH#PBF) |
| 36 | LT3590 | 1 | 4.5 | 55 | 50m | 55 | Buck, LED Driver | Yes | $1.40 (LT3590EDC#TRPBF) |
| 37 | LT3518 | 1 | 3 | 30 | 1.86 | 45 | Boost, Buck, Buck-Boost, LED Driver | Yes | $2.95 (LT3518EUF#PBF) |
| 38 | LT3496 | 3 | 3 | 30 | 700m | 45 | Boost, Buck, Buck-Boost, LED Driver | Yes | $3.50 (LT3496EUFD#PBF) |
| 39 | LT3476 | 4 | 2.8 | 16 | 1 | 36 | Boost, Buck, Buck-Boost, LED Driver | Yes | $4.64 (LT3476EUHF#PBF) |
| 40 | LT3475-1 | 2 | 4 | 36 | 1.5 | 25 | Buck, LED Driver | Yes | $3.50 (LT3475EFE-1#PBF) |
| 41 | LT3475 | 2 | 4 | 36 | 1.5 | 15 | Buck, LED Driver | Yes | $3.50 (LT3475EFE#PBF) |
| 42 | LT3478 | 1 | 2.8 | 36 | 4.2 | 42 | Boost, Buck, Buck-Boost, LED Driver | Yes | $3.60 (LT3478EFE#PBF) |
| 43 | LT3474-1 | 1 | 4 | 36 | 1 | 26 | Buck, LED Driver | Yes | $2.95 (LT3474EFE-1#PBF) |
| 44 | LT3474 | 1 | 4 | 36 | 1 | 15 | Buck, LED Driver | Yes | $2.95 (LT3474EFE#PBF) |
| 45 | LT3477 | 1 | 2.3 | 25 | 2.66 | 40 | Boost, Buck, Buck-Boost, LED Driver | Yes | $3.15 (LT3477EUF#PBF) |
| 46 | AD8240 | 1 | 9 | 27 | - | - | - | Yes | $1.29 (AD8240YRMZ) |
| 47 | LT1618 | 1 | 1.6 | 18 | 1 | 36 | Boost, Flyback, Sepic | Yes | $1.75 (LT1618EDD#PBF) |
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