LT3791EFE#PBF - 60V 4-Switch Sync Buck-Boost LED Driver | ADI
料号： LT3791EFE#PBF ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 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 概述
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.
直接替换替代料： LT3791EFE#PBF ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
本系列中的变体
可与以下型号直接替换的同系列型号： LT3791EFE#PBF （相同外形与封装尺寸） ——差异在于 Input Voltage Range, Package, Topology, Dimming, RoHS Status.
快速对比工具——选择替代料号进行并排对比：
LT3791EFE-1#PBF
✅ 直接替换📋 参考替代料（不在目录中）
LT3791IFE#PBF
✅ 直接替换 ⚠️ 规格未核验✓ 有现货
$4.5 / 个
查看数据手册 →LT3791EFE#TRPBF
✅ 直接替换✓ 有现货
$5.5 / 个
查看数据手册 →LT3791IFE-1#PBF
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
LT3791IFE-1#TRPBF
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
LT3791EFE#PBF 最大额定值与电气特性
| 拓扑 | Buck-Boost |
| 输出数量 | 1 |
| 输出电压 - 最大 | 60 V |
| 输出电流（最大） | 10 A |
| Input Voltage (Min) | 4.7 V |
| Input Voltage (Max) | 60 V |
| 开关频率 | 200 kHz to 700 kHz |
| Dimming | Analog, PWM |
| 效率 | 98.5% |
| 封装 | 38-TSSOP-EP |
| 安装类型 | Surface Mount |
| 工作温度 | -40C to +125C |
| RoHS 状态 | Compliant |
| Output Voltage Accuracy | 2% |
| Control Architecture | Current Mode |
LT3791EFE#PBF 引脚配置
| 引脚 1 | BOOST1 — Bootstrap for high-side MOSFET 1 |
| 引脚 2 | TG1 — High-side gate drive for switch 1 |
| 引脚 3 | SW1 — Switch node 1 |
| 引脚 4 | BG1 — Low-side gate drive for switch 1 |
| 引脚 5 | VIN — Input supply voltage |
| 引脚 6 | BG2 — Low-side gate drive for switch 2 |
| 引脚 7 | SW2 — Switch node 2 |
| 引脚 8 | TG2 — High-side gate drive for switch 2 |
| 引脚 9 | BOOST2 — Bootstrap for high-side MOSFET 2 |
| 引脚 10 | VOUT — Output voltage sense |
| 引脚 11 | SENSE+ — Positive current sense input |
| 引脚 12 | SENSE- — Negative current sense input |
| 引脚 13 | CTRL — Analog dimming control input |
| 引脚 14 | PWM — PWM dimming input |
| 引脚 15 | FREQ — Switching frequency set/sync |
| 引脚 16 | SS — Soft-start capacitor |
| 引脚 17 | VC — Error amplifier compensation |
| 引脚 18 | FB — Feedback for voltage regulation |
| 引脚 19 | GND — Ground |
| 引脚 20 | EXPOSED PAD — Thermal pad, connect to GND |
典型应用
LT3791EFE#PBF 适用于 6 应用s: 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.
推荐
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.
推荐
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.
推荐
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.
推荐
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.
推荐
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.
推荐
推荐产品汇总
工程参考数据： LT3791EFE#PBF ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 | 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) |
关键差异点
- 4-switch synchronous buck-boost topology （对比 LT3791EFE-1#PBF)
- High efficiency up to 98.5% （对比 LT3791IFE#PBF)
- Wide input voltage range (4.7V to 60V) （对比 LT3791EFE#TRPBF)
设计说明
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.
合规信息
RoHS compliant per #PBF suffix. AEC-Q100 not applicable as this is not an automotive-qualified part.
