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. Our synchronous 4-switch Buck-Boost LED Driver architecture transitions between buck, pass-through and boost operating modes seamlessly, offering a well-regulated output despite the wide variations of the input voltage. Other differentiating features include integrated Schottky diodes, accurate LED current matching, and multiple output capability.
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Technical Articles Page
- 4.5A Monolithic LED Drivers with 3000:1 Dimming are Ideal for a Wide Range of High Power LED Applications
- Triple Output LED Driver Delivers 3000:1 Dimming Ratio in Buck, Boost or Buck-Boost Mode
- LED Driver Yields 3000:1 True Color PWM Dimming with Any Buck, Boost or Buck-Boost Topology from a Wide 3V–40V Input Range
- One LED Driver Is All You Need for Automotive LED Headlight Clusters (LT3795)
- Constant Current from 3A DC/DC Converter with 2 Rail-to-Rail Current Sense Amplifiers
- Buck-Boost LED Driver Reaches 98% Efficiency, Features Internal PWM Dimming and Spread Spectrum without Flicker
- Meet Green Standards in 24VAC and 12VAC Lighting Systems: Replace Halogen Bulbs with LEDs Driven by High Power Factor, High Efficiency Converter
- 140W Monolithic Switching Regulator Simplifies Constant-Current/Constant-Voltage Regulation
- Spread Spectrum Frequency Modulation Reduces EMI
- 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
- 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
- Spread Spectrum Frequency Modulation Reduces Automotive LED Driver EMI
- High Power Three-Channel LED Driver (LT3797)
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 | LT3942 | 1 | 3 | 36 | 2 | 36 | Yes | Buck-Boost | $2.95 (LT3942EUFD#PBF) |
| 2 | LT3952A | 1 | 3 | 42 | 4 | 60 | Yes | Boost, Buck, Buck-Boost, LED Driver | $2.95 (LT3952AEFE#PBF) |
| 3 | LT8391A | 1 | 4 | 60 | 10 | 60 | No | Buck-Boost, LED Driver | $3.23 (LT8391AEUFD#PBF) |
| 4 | LT3922-1 | 1 | 2.8 | 36 | 2 | 40 | Yes | Boost, Buck, Buck-Boost | $2.71 (LT3922EUFD-1#PBF) |
| 5 | LT3922 | 1 | 2.8 | 36 | 2 | 40 | Yes | Boost, Buck, Buck-Boost | $2.71 (LT3922EUFD#PBF) |
| 6 | LT8391 | 1 | 4 | 60 | 10 | 60 | No | Buck-Boost, LED Driver | $3.23 (LT8391EUFD#PBF) |
| 7 | LT3761A | 1 | 4.5 | 60 | 10 | 100 | No | Boost, Buck, Buck-Boost, LED Driver, Sepic | $3.20 (LT3761AEMSE#PBF) |
| 8 | LT3761 | 1 | 4.5 | 60 | 10 | 100 | No | Boost, Buck, Buck-Boost, LED Driver, Sepic | $3.20 (LT3761EMSE#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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