LT3791EFE#TRPBF - 60V 4-Switch Sync Buck-Boost LED Driver | ADI
MPN: LT3791EFE#TRPBF β Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $8.5 | $8.50 |
| 10 | $7.65 | $76.50 |
| 100 | $6.8 | $680.00 |
| 500 | $6.12 | $3,060.00 |
| 1,000 | $5.5 | $5,500.00 |
Drop-in alternatives for LT3791EFE#TRPBF β same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool β Select alternative parts for side-by-side comparison:
LT3791EFE#PBF
β Drop-Inβ In Stock
$10.76 / Unit
View Datasheet βLT3791EFE-1#TRPBF
β‘ Same Packageπ Reference alternative (not in catalog)
LT3791EFE-1#PBF
β‘ Same Packageπ Reference alternative (not in catalog)
LT3791HFE#TRPBF
β Drop-Inπ Reference alternative (not in catalog)
LT3791IFE#TRPBF
β Drop-Inπ Reference alternative (not in catalog)
LT3791MPFE#TRPBF
β Drop-Inπ Reference alternative (not in catalog)
LT3791EFE#TRPBF Maximum Ratings & Electrical Characteristics
| Topology | Buck-Boost |
| Number of Outputs | 1 |
| Input Voltage Range | 4.7V to 60V |
| LED String Voltage | Up to 52V |
| Switching Frequency | 200kHz to 700kHz |
| Dimming | Analog and PWM |
| Control Architecture | Current Mode |
| Package | 38-TSSOP-EP |
| Operating Temperature Range | -40Β°C to 125Β°C |
| Mounting Type | Surface Mount |
| RoHS Status | Compliant |
| REACH Status | Compliant |
| MSL Level | [DATA_NEEDED: MSL Level] |
| Synchronous Rectification | Yes |
| External MOSFETs | Yes |
LT3791EFE#TRPBF Pin Configuration
| Pin 1 | BOOST1 β Bootstrap capacitor connection for high-side MOSFET |
| Pin 2 | TG1 β High-side gate drive for switch A |
| Pin 3 | SW1 β Switch node for switch A |
| Pin 4 | BG1 β Low-side gate drive for switch A |
| Pin 5 | VIN β Input supply voltage |
| Pin 6 | BG2 β Low-side gate drive for switch B |
| Pin 7 | SW2 β Switch node for switch B |
| Pin 8 | TG2 β High-side gate drive for switch B |
| Pin 9 | BOOST2 β Bootstrap capacitor connection for high-side MOSFET |
| Pin 10 | VOUT β Output voltage sense |
| Pin 11 | SENSE β Current sense input |
| Pin 12 | CTRL1 β Control input for analog dimming |
| Pin 13 | CTRL2 β Control input for PWM dimming |
| Pin 14 | SS β Soft-start capacitor connection |
| Pin 15 | FREQ β Switching frequency set resistor |
| Pin 16 | SYNC β External clock synchronization input |
| Pin 17 | VREF β Reference voltage output |
| Pin 18 | GND β Ground |
| Pin 19 | GND β Ground |
| Pin 20 | GND β Ground |
| Pin 21 | GND β Ground |
| Pin 22 | GND β Ground |
| Pin 23 | GND β Ground |
| Pin 24 | GND β Ground |
| Pin 25 | GND β Ground |
| Pin 26 | GND β Ground |
| Pin 27 | GND β Ground |
| Pin 28 | GND β Ground |
| Pin 29 | GND β Ground |
| Pin 30 | GND β Ground |
| Pin 31 | GND β Ground |
| Pin 32 | GND β Ground |
| Pin 33 | GND β Ground |
| Pin 34 | GND β Ground |
| Pin 35 | GND β Ground |
| Pin 36 | GND β Ground |
| Pin 37 | GND β Ground |
| Pin 38 | GND β Ground |
Safe Operating Area (SOA) & Thermal Characteristics
No official SOA curve available for this component. Always operate within absolute maximum ratings specified in the datasheet. Ensure adequate cooling and derate as needed.
Typical Applications
LT3791EFE#TRPBF is suitable for 6 applications: Automotive LED Headlights, Industrial LED Lighting, General Purpose Constant-Current LED Driver, LED Backlighting for Displays, Portable and Battery-Powered Lighting, Solar-Powered LED Lighting.
Automotive LED Headlights
The LT3791EFE#TRPBF is ideal for automotive LED headlights due to its wide input voltage range (4.7V to 60V) and ability to regulate LED current up to 52V. It handles voltage transients from the vehicle's electrical system, ensuring stable brightness. The 4-switch buck-boost topology maintains regulation even when the battery voltage drops during cranking. PWM dimming enables adaptive lighting features. The -40Β°C to 125Β°C operating range suits under-hood environments. Its high efficiency reduces thermal stress, and the 38-TSSOP-EP package with exposed pad aids heat dissipation.
Recommended
Industrial LED Lighting
In industrial lighting, the LT3791EFE#TRPBF provides constant-current regulation for high-power LED arrays. Its wide input range accommodates 24V or 48V industrial supplies, while the buck-boost topology ensures consistent brightness across varying line voltages. The adjustable switching frequency (200kHz to 700kHz) allows optimization for efficiency or component size. Analog dimming enables simple brightness control, and the forced-continuous current mode simplifies EMI filtering. The controller's robust protection features, including open LED and short-circuit protection, ensure reliable operation in harsh industrial environments.
Recommended
General Purpose Constant-Current LED Driver
The LT3791EFE#TRPBF serves as a versatile constant-current LED driver for various lighting applications, from signage to architectural lighting. Its ability to step up or step down voltage makes it suitable for LED strings with varying forward voltages. The PWM dimming capability allows for high contrast ratios, essential for display backlighting. The controller's current mode architecture provides excellent line and load regulation. With a wide input range and high output voltage capability, it can drive multiple LEDs in series, reducing the need for multiple drivers. The 38-TSSOP-EP package is compact, saving board space.
Recommended
LED Backlighting for Displays
For display backlighting, the LT3791EFE#TRPBF provides precise current control and PWM dimming, enabling high contrast ratios and uniform brightness. Its wide input voltage range supports various power supplies, from 5V USB to 24V industrial rails. The buck-boost topology ensures consistent LED current even when the input voltage fluctuates. The adjustable switching frequency allows designers to avoid interference with display timing signals. The controller's high efficiency reduces heat generation, which is critical in compact display modules. The 38-TSSOP-EP package with exposed pad aids thermal management.
Recommended
Portable and Battery-Powered Lighting
The LT3791EFE#TRPBF is suitable for portable lighting powered by batteries, where input voltage varies as the battery discharges. Its wide input range (4.7V to 60V) allows operation from a single cell to multiple cells. The buck-boost topology maintains constant LED current regardless of battery voltage, ensuring consistent brightness. The low quiescent current and high efficiency extend battery life. PWM dimming allows for brightness control, and the small 38-TSSOP-EP package is ideal for compact designs. The controller's protection features prevent damage from reverse battery or overcurrent conditions.
Recommended
Solar-Powered LED Lighting
In solar-powered lighting, the LT3791EFE#TRPBF efficiently regulates LED current from a varying solar panel output. Its wide input range (4.7V to 60V) accommodates the voltage fluctuations from solar panels. The buck-boost topology ensures maximum power extraction and consistent LED brightness. The adjustable switching frequency allows optimization for efficiency, and the forced-continuous current mode simplifies EMI filtering. The controller's high efficiency is crucial for maximizing battery life in off-grid systems. The 38-TSSOP-EP package is suitable for outdoor enclosures, and the -40Β°C to 125Β°C range handles extreme temperatures.
Recommended
Recommended Products Summary
Engineering reference data for LT3791EFE#TRPBF β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | LT3791EFE#PBF | LT3791EFE-1#TRPBF | LT3791HFE#TRPBF |
|---|---|---|---|---|
| Package | 38-TSSOP-EP | 38-TSSOP-EP | 38-TSSOP-EP | 38-TSSOP-EP |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Function | LED Driver Controller | LED Driver Controller | Voltage/Current Regulator Controller | LED Driver Controller |
| Input Voltage Range | 4.7V to 60V | 4.7V to 60V | 4.7V to 60V | 4.7V to 60V |
| Switching Frequency | 200kHz to 700kHz | 200kHz to 700kHz | 200kHz to 700kHz | 200kHz to 700kHz |
| Dimming | Analog and PWM | Analog and PWM | Analog and PWM | Analog and PWM |
| Operating Temperature Range | -40Β°C to 125Β°C | -40Β°C to 125Β°C | -40Β°C to 125Β°C | -40Β°C to 150Β°C |
| RoHS | Compliant | Compliant | Compliant | Compliant |
Key Differentiators
- 4-switch synchronous buck-boost topology (vs LT3791EFE-1#TRPBF)
- Wide input voltage range (4.7V to 60V) (vs LT3791EFE#PBF)
- High LED string voltage capability (up to 52V) (vs LT3791EFE-1#TRPBF)
Design Notes
For optimal performance, place the input and output capacitors close to the VIN and VOUT pins. The switching nodes (SW1, SW2) should have minimal trace length to reduce parasitic inductance. Use a solid ground plane and connect the exposed pad to the ground plane with multiple vias for thermal and electrical performance.
The LT3791EFE#TRPBF is a controller, so its power dissipation is low, but the external MOSFETs and inductor will generate heat. Ensure adequate copper area and airflow around these components. The exposed pad of the TSSOP-EP package should be soldered to a large copper area to keep the controller cool.
When selecting the inductor, ensure it can handle the peak current without saturating. The current sense resistor must be placed close to the SENSE pin to avoid noise. Also, verify that the bootstrap capacitors are sized correctly for the gate drive requirements of the external MOSFETs.
Compliance Information
RoHS and REACH compliance confirmed from distributor listings. AEC-Q100 not applicable as this is not an automotive-qualified part. Lead-free per part number suffix.
