LT3791EFE#PBF - 60V 4-Switch Sync Buck-Boost LED Driver | ADI
N.º de pieza: LT3791EFE#PBF ✓ Activo| Cant. | Precio unitario | Total |
|---|---|---|
| 1 | $16.85 | $16,85 |
| 10 | $15.42 | $154,20 |
| 100 | $13.87 | $1.387,00 |
| 500 | $12.31 | $6.155,00 |
| 1.000 | $10.76 | $10.760,00 |
LT3791EFE#PBF Descripción general
A buck-boost LED driver controller is a power management IC that regulates current through an LED string by controlling four external MOSFETs in a single-inductor topology. It can step up or step down the input voltage to maintain a constant LED current, making it essential for applications where the supply voltage varies around the LED forward voltage. This controller sits within the hierarchy of LED drivers, which are part of power management integrated circuits used in lighting systems.
Key features include a 4-switch single-inductor architecture that allows VIN above, below, or equal to VOUT, synchronous switching for efficiency up to 98.5%, a wide input voltage range, and 2% output voltage accuracy. The controller supports both analog and PWM dimming, with a frequency adjustable or synchronizable from 200kHz to 700kHz. It also provides open LED and short LED protection, along with a precision current sense amplifier.
The LT3791EFE#PBF uses a constant-frequency, current-mode architecture with forced-continuous operation, ensuring stable operation across all conditions. The 4-switch topology eliminates the need for a separate boost and buck stage, reducing component count and board space. The controller can regulate LED current with ±2% accuracy, and its wide input range makes it suitable for automotive, industrial, and general lighting applications.
Typical applications include automotive headlamps, industrial lighting, and high-power LED drivers. The device is ideal for battery-powered systems where input voltage varies, such as in vehicles or portable equipment. Its ability to operate with input voltages above or below the LED string voltage makes it versatile for various LED configurations.
When designing with this controller, ensure proper PCB layout for the high-current switching paths and adequate thermal management for the external MOSFETs. The frequency synchronization pin allows multiple controllers to operate at the same frequency, reducing EMI in multi-channel designs.
Alternativas directas para LT3791EFE#PBF — mismo encapsulado, compatible pin a pin. Se excluyen las piezas de otro encapsulado que requieren retrabajo de la PCB.
Variantes de esta serie
Modelos de la misma serie compatibles directamente con LT3791EFE#PBF (mismo factor de forma y huella) — difiere en Input Voltage Range, Package, Topology, Dimming, RoHS Status.
Herramienta de comparación rápida — seleccione piezas alternativas para compararlas lado a lado:
LT3791EFE-1#PBF
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
LT3791IFE#PBF
✅ Sustitución directa ⚠️ Especificaciones sin verificar✓ En stock
$4.5 / unidad
Ver hoja de datos →LT3791EFE#TRPBF
✅ Sustitución directa✓ En stock
$5.5 / unidad
Ver hoja de datos →LT3791IFE-1#PBF
✅ Sustitución directa ⚠️ Especificaciones sin verificar📋 Alternativa de referencia (no en el catálogo)
LT3791IFE-1#TRPBF
✅ Sustitución directa ⚠️ Especificaciones sin verificar📋 Alternativa de referencia (no en el catálogo)
LT3791EFE#PBF Valores máximos y características eléctricas
| Topología | Buck-Boost |
| Número de salidas | 1 |
| Tensión de salida - máx. | 60 V |
| Corriente de salida (máx.) | 10 A |
| Input Voltage (Min) | 4.7 V |
| Input Voltage (Max) | 60 V |
| Frecuencia de conmutación | 200 kHz to 700 kHz |
| Dimming | Analog, PWM |
| Eficiencia | 98.5% |
| Encapsulado | 38-TSSOP-EP |
| Tipo de montaje | Surface Mount |
| Temperatura de funcionamiento | -40C to +125C |
| Estado RoHS | Compliant |
| Output Voltage Accuracy | 2% |
| Control Architecture | Current Mode |
Configuración de pines de LT3791EFE#PBF
| Pin 1 | BOOST1 — Bootstrap for high-side MOSFET 1 |
| Pin 2 | TG1 — High-side gate drive for switch 1 |
| Pin 3 | SW1 — Switch node 1 |
| Pin 4 | BG1 — Low-side gate drive for switch 1 |
| Pin 5 | VIN — Input supply voltage |
| Pin 6 | BG2 — Low-side gate drive for switch 2 |
| Pin 7 | SW2 — Switch node 2 |
| Pin 8 | TG2 — High-side gate drive for switch 2 |
| Pin 9 | BOOST2 — Bootstrap for high-side MOSFET 2 |
| Pin 10 | VOUT — Output voltage sense |
| Pin 11 | SENSE+ — Positive current sense input |
| Pin 12 | SENSE- — Negative current sense input |
| Pin 13 | CTRL — Analog dimming control input |
| Pin 14 | PWM — PWM dimming input |
| Pin 15 | FREQ — Switching frequency set/sync |
| Pin 16 | SS — Soft-start capacitor |
| Pin 17 | VC — Error amplifier compensation |
| Pin 18 | FB — Feedback for voltage regulation |
| Pin 19 | GND — Ground |
| Pin 20 | EXPOSED PAD — Thermal pad, connect to GND |
Aplicaciones típicas
LT3791EFE#PBF es adecuado para 6 aplicacións: Automotive Headlamps, Industrial Lighting, High-Power LED Drivers, Battery-Powered Systems, General Lighting, LED Backlighting.
Automotive Headlamps
The LT3791EFE#PBF is ideal for automotive headlamps due to its wide input voltage range (4.7V to 60V) and high efficiency up to 98.5%. It can regulate LED current up to 10A, providing consistent brightness even as the battery voltage varies during cranking or load transients. The 4-switch buck-boost topology ensures operation when the input voltage is above or below the LED string voltage, which is common in automotive systems. PWM dimming enables adaptive lighting features, and the controller's robust protection features (open/short LED) enhance reliability in harsh environments.
Recomendado
Industrial Lighting
In industrial lighting, the LT3791EFE#PBF provides a flexible solution for high-power LED drivers. Its wide input range accommodates various supply voltages (24V, 48V, etc.), and the 4-switch architecture allows driving LED strings with forward voltages above or below the input. The controller's 200kHz to 700kHz switching frequency enables optimization of inductor size and efficiency. With analog and PWM dimming, it supports precise light control for applications like street lighting and factory illumination. The high efficiency reduces thermal stress, and the 38-pin TSSOP-EP package is suitable for compact industrial fixtures.
Recomendado
High-Power LED Drivers
The LT3791EFE#PBF is designed for high-power LED drivers requiring up to 10A of LED current. Its synchronous 4-switch buck-boost topology achieves up to 98.5% efficiency, minimizing power loss and heat generation. The controller regulates LED current with ±2% accuracy, ensuring consistent light output. It supports both analog and PWM dimming, making it suitable for applications like stage lighting, architectural lighting, and LED video walls. The wide input voltage range allows operation from various power sources, including batteries and solar panels, providing design flexibility.
Recomendado
Battery-Powered Systems
For battery-powered systems, the LT3791EFE#PBF's ability to operate with input voltages above, below, or equal to the output is crucial. As the battery discharges, its voltage drops, and the buck-boost topology ensures the LED current remains regulated. The controller's low quiescent current and high efficiency extend battery life. It is suitable for portable lighting, emergency lights, and solar-powered LED systems. The PWM dimming feature allows power saving by reducing brightness when full output is not needed, further enhancing battery runtime.
Recomendado
General Lighting
The LT3791EFE#PBF is well-suited for general lighting applications such as LED bulbs, downlights, and panel lights. Its wide input range (4.7V to 60V) allows it to work with various AC-DC adapters or DC supplies. The high efficiency reduces energy consumption, and the compact 38-pin TSSOP-EP package enables small form factor designs. Analog dimming provides a simple interface for dimmable lighting, while PWM dimming offers high dimming ratios for advanced control. The controller's protection features ensure reliable operation in consumer lighting products.
Recomendado
LED Backlighting
In LED backlighting applications, the LT3791EFE#PBF provides precise current regulation for LED strings in displays and monitors. Its 4-switch buck-boost topology allows driving LED strings with forward voltages that may be higher or lower than the input supply, which is common in backlight units. The controller supports PWM dimming for brightness control and local dimming features. With efficiency up to 98.5%, it minimizes heat generation, which is critical in thin display designs. The wide input range accommodates various power supply configurations, making it a versatile choice for backlight drivers.
Recomendado
Resumen de productos recomendados
Datos de referencia de ingeniería para LT3791EFE#PBF — comparación, orientación de diseño e información de cumplimiento.
Guía de selección
Comparación con alternativas
| Parámetro | Este producto | LT3791EFE-1#PBF | LT3791IFE#PBF | LT3791EFE#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 | Voltage/Current Regulator Controller | LED Driver Controller | LED Driver Controller |
| Input Voltage Range | 4.7V to 60V | 4.7V to 60V | 4.7V to 60V | 4.7V to 60V |
| Output Current | 10A | 10A | 10A | 10A |
| Switching Frequency | 200kHz to 700kHz | 200kHz to 700kHz | 200kHz to 700kHz | 200kHz to 700kHz |
| Dimming | Analog, PWM | Analog, PWM | Analog, PWM | Analog, PWM |
| Temperature Grade | Commercial (0C to 70C) | Commercial (0C to 70C) | Industrial (-40C to +125C) | Commercial (0C to 70C) |
Diferenciadores clave
- 4-switch synchronous buck-boost topology (frente a LT3791EFE-1#PBF)
- High efficiency up to 98.5% (frente a LT3791IFE#PBF)
- Wide input voltage range (4.7V to 60V) (frente a LT3791EFE#TRPBF)
Notas de diseño
For high-current switching paths, use wide, short traces to minimize parasitic inductance and resistance. Place the input and output capacitors close to the MOSFETs and controller pins. The exposed pad should be soldered to a large copper pour for thermal dissipation. Refer to the LT3791 datasheet layout guidelines for optimal performance.
The LT3791EFE#PBF itself dissipates minimal power, but the external MOSFETs and inductor handle high currents. Ensure adequate heatsinking for the MOSFETs, especially in high-power applications. The 38-pin TSSOP-EP package's exposed pad should be connected to a ground plane to improve thermal performance. Calculate power dissipation and use thermal vias if necessary.
Avoid exceeding the absolute maximum ratings for VIN and VOUT (60V). Ensure the bootstrap capacitors are properly sized for the switching frequency. The frequency synchronization pin should be terminated if not used. Also, verify the current sense resistor value to achieve the desired LED current, as incorrect values can lead to inaccurate regulation.
Información de cumplimiento
RoHS compliant per #PBF suffix. AEC-Q100 not applicable as this is not an automotive-qualified part.
