Buck-Boost LED Drivers
Analog Devices buck/boost LED drivers allow LED bias when the input voltage is either above or below the LED voltage. This is ideal in cases such as a single cell lithium-ion (Li-Ion) battery driving a single LED where the input voltage can vary from 4.2 V fully charged down to 2.7 V fully depleted, while the LED forward voltage can vary from 2 V to 4 V depending on brightness and temperature. Our 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
- Single 2MHz Buck-Boost Controller Drives Entire LED Headlight Cluster, Meets CISPR 25 Class 5 EMI PDF
- Buck-Boost LED Driver Reaches 98% Efficiency, Features Internal PWM Dimming and Spread Spectrum without Flicker PDF
- One LED Driver Is All You Need for Automotive LED Headlight Clusters (LT3795) PDF
- Meet Green Standards in 24VAC and 12VAC Lighting Systems: Replace Halogen Bulbs with LEDs Driven by High Power Factor, High Efficiency Converter PDF
- Combined Voltage and Current Control Loops Simplify LED Drivers, High Capacity Battery/Supercap Chargers & MPPT* Solar Applications PDF
- March 2009 - Don’t Want to Hear It? Avoid the Audio Band with PWM LED Dimming at Frequencies Above 20kHz 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
- Jun 2007 - 4.5A Monolithic LED Drivers with 3000:1 Dimming are Ideal for a Wide Range of High Power LED Applications PDF
- Jun 2007 - Triple Output LED Driver Delivers 3000:1 Dimming Ratio in Buck, Boost or Buck-Boost Mode PDF
- Dec 2005 Constant Current from 3A DC/DC Converter with 2 Rail-to-Rail Current Sense Amplifiers PDF
- 140W Monolithic Switching Regulator Simplifies Constant-Current/Constant-Voltage Regulation
Technical Articles
- Spread Spectrum Frequency Modulation Reduces EMI
- Meet Green Standards in 24VAC and 12VAC Lighting Systems: Replace Halogen Bulbs with LEDs Driven by High Power Factor, High Efficiency Converter
- 60V 2MHz Buck-Boost Controllers Regulate High Power Voltage and Current with High Efficiency and Low EMI
- Low EMI LED Driver Features 2A, 40V, Integrated, Synchronous Switches for Automotive Lighting
- 3A, 1MHz Buck Mode LED Driver with Integrated Voltage Limiting
Videos
- Spread Spectrum Frequency Modulation Reduces Automotive LED Driver EMI
- High Power Three-Channel LED Driver (LT3797)
- 60V, 98% Efficient, 4-Switch Synchronous Buck-Boost Controller IC Drives LEDs, Regulates Voltage and Charges Batteries
- 60V 8-Switch Matrix LED Dimmer (LT3965)
- 60V LED Driver with Internal 4A Switch for Automotive Lighting (LT3952)
- Low EMI LED Driver with Synchronous Internal 2A Switches
Design Notes
- DN567 - 60V 2MHz Buck-Boost Controllers Regulate High Power Voltage and Current with High Efficiency and Low EMI 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
- DN548 - 60V Buck-Boost LED Driver with Up to 98% Efficiency Has Internal PWM Dimming and Spread Spectrum 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
- DN501 - 60V Buck-Boost Controller Drives High Power LEDs, Charges Batteries and Regulates Voltage with Up to 98.5% Efficiency at 100W and Higher 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
Buck-Boost LED Drivers
| SortOrder | Part# | Number of Outputs | Vin (min) (V) | Vin (max) (V) | Output Current (typ) (A) | Vout Max (typ) (V) | Monolithic | Topology | Price (1000+) ($ US) |
|---|---|---|---|---|---|---|---|---|---|
| 1 | LT3952A | 1 | 3 | 42 | 4 | 60 | Yes | Boost, Buck, Buck-Boost, LED Driver | $2.95 (LT3952AEFE#PBF) |
| 2 | LT8391A | 1 | 4 | 60 | 10 | 60 | No | Buck-Boost, LED Driver | $3.23 (LT8391AEUFD#PBF) |
| 3 | LT3922-1 | 1 | 2.8 | 36 | 2 | 40 | Yes | Boost, Buck, Buck-Boost | $2.71 (LT3922EUFD-1#PBF) |
| 4 | LT3922 | 1 | 2.8 | 36 | 2 | 40 | Yes | Boost, Buck, Buck-Boost | $2.71 (LT3922EUFD#PBF) |
| 5 | LT8391 | 1 | 4 | 60 | 10 | 60 | No | Buck-Boost, LED Driver | $3.23 (LT8391EUFD#PBF) |
| 6 | LT3761A | 1 | 4.5 | 60 | 10 | 100 | No | Boost, Buck, Buck-Boost, LED Driver, Sepic | $3.20 (LT3761AEMSE#PBF) |
| 7 | LT3761 | 1 | 4.5 | 60 | 10 | 100 | No | Boost, Buck, Buck-Boost, LED Driver, Sepic | $3.20 (LT3761EMSE#PBF) |
| 8 | LT3952 | 1 | 3 | 42 | 4 | 60 | Yes | Boost, Buck, Buck-Boost, LED Driver | $3.95 (LT3952EFE#PBF) |
| 9 | LT3795 | 1 | 4.5 | 110 | 10 | 110 | No | Boost, Buck, Buck-Boost, LED Driver, Sepic | $3.45 (LT3795EFE#PBF) |
| 10 | LT3955 | 1 | 4.5 | 60 | 1 | 80 | Yes | Boost, Buck, Buck-Boost, LED Driver, Sepic | $3.75 (LT3955EUHE#PBF) |
| 11 | LT3954 | 1 | 4.5 | 40 | 4 | 40 | Yes | Boost, Buck, Buck-Boost, LED Driver, Sepic | $3.60 (LT3954EUHE#PBF) |
| 12 | LT3797 | 3 | 2.5 | 40 | 5 | 100 | No | Boost, Buck, Buck-Boost, LED Driver, Sepic | $4.95 (LT3797ELXE#PBF) |
| 13 | LT3796 | 1 | 6 | 100 | 10 | 100 | No | Boost, Buck, Buck-Boost, LED Driver, Sepic | $3.45 (LT3796EFE#PBF) |
| 14 | LT3791 | 1 | 4.7 | 60 | 10 | 60 | No | Buck-Boost, LED Driver | $4.75 (LT3791EFE#PBF) |
| 15 | LTM8042-1 | 1 | 3 | 30 | 350m | 32 | Yes | Boost, Buck, LED Driver | $8.76 (LTM8042EV-1#PBF) |
| 16 | LTM8042 | 1 | 3 | 30 | 1 | 32 | Yes | Boost, Buck, LED Driver | $8.76 (LTM8042EV#PBF) |
| 17 | LT3519 | 1 | 3 | 30 | 500m | 45 | Yes | Boost, Buck, Buck-Boost, LED Driver, Sepic | $2.50 (LT3519EMS#PBF) |
| 18 | LT3956 | 1 | 4.5 | 80 | 1.5 | 80 | Yes | Boost, Buck, Buck-Boost, Flyback, LED Driver, Sepic | $3.50 (LT3956EUHE#PBF) |
| 19 | LT3756 | 1 | 6 | 100 | 10 | 100 | No | Boost, Buck, Buck-Boost, LED Driver, Sepic | $2.90 (LT3756EUD#PBF) |
| 20 | LT3755 | 1 | 4.5 | 40 | 10 | 75 | No | Boost, Buck, Buck-Boost, LED Driver, Sepic | $2.75 (LT3755EUD#PBF) |
| 21 | LT3492 | 3 | 3 | 30 | 300m | 60 | Yes | Boost, Buck, Buck-Boost, LED Driver | $3.70 (LT3492EUFD#PBF) |
| 22 | LT3517 | 1 | 3 | 30 | 1.25 | 40 | Yes | Boost, Buck, Buck-Boost, LED Driver | $2.70 (LT3517EUF#PBF) |
| 23 | LT3518 | 1 | 3 | 30 | 1.86 | 45 | Yes | Boost, Buck, Buck-Boost, LED Driver | $2.95 (LT3518EUF#PBF) |
| 24 | LT3496 | 3 | 3 | 30 | 700m | 45 | Yes | Boost, Buck, Buck-Boost, LED Driver | $3.50 (LT3496EUFD#PBF) |
| 25 | LT3476 | 4 | 2.8 | 16 | 1 | 36 | Yes | Boost, Buck, Buck-Boost, LED Driver | $4.64 (LT3476EUHF#PBF) |
| 26 | LTC3452 | 7 | 2.7 | 5.5 | 50m | 4.5 | Yes | Buck-Boost, LED Driver | $1.80 (LTC3452EUF#PBF) |
| 27 | LT3478 | 1 | 2.8 | 36 | 4.2 | 42 | Yes | Boost, Buck, Buck-Boost, LED Driver | $3.60 (LT3478EFE#PBF) |
| 28 | LTC3454 | 1 | 2.7 | 5.5 | 1 | 5.15 | Yes | Buck-Boost, LED Driver | $1.95 (LTC3454EDD#PBF) |
| 29 | LT3477 | 1 | 2.3 | 25 | 2.66 | 40 | Yes | Boost, Buck, Buck-Boost, LED Driver | $3.15 (LT3477EUF#PBF) |
| 30 | LTC3453 | 4 | 2.7 | 5.5 | 125m | 4.5 | Yes | Buck-Boost, LED Driver | $1.85 (LTC3453EUF#PBF) |
| 31 | LT1618 | 1 | 1.6 | 18 | 1 | 36 | Yes | Boost, Flyback, Sepic | $1.75 (LT1618EDD#PBF) |
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