LT3791EFE#TRPBF - 60V 4-Switch Sync Buck-Boost LED Driver | ADI
MPN： LT3791EFE#TRPBF ✓ 啟用中LT3791EFE#TRPBF 概覽
A buck-boost LED driver controller is a specialized power management IC that combines step-down (buck) and step-up (boost) topologies to maintain a regulated output current regardless of whether the input voltage is higher or lower than the LED string voltage. This makes it ideal for automotive, industrial, and general lighting applications where input voltage variations are common. The LT3791 belongs to the family of switching regulators, specifically DC-DC controllers, which are essential in power management systems for converting and regulating electrical power efficiently.
Key features include a wide 4.7V to 60V input voltage range, adjustable switching frequency from 200kHz to 700kHz, and the ability to synchronize to an external clock. The controller provides analog and PWM dimming, with PWM dimming capable of achieving high contrast ratios. Its 4-switch architecture allows seamless transitions between buck, boost, and buck-boost modes, ensuring stable operation across the entire input range. The device also includes features such as open LED protection, short-circuit protection, and a precision current sense amplifier.
Technically, the LT3791 uses a current mode control architecture with a 4-switch synchronous topology, which improves efficiency by eliminating the need for external Schottky diodes. The controller can drive external N-channel MOSFETs, allowing designers to scale the solution to high-power applications. The forced-continuous current mode ensures predictable operation and simplifies EMI filtering. The device operates over a -40°C to 125°C junction temperature range, making it suitable for harsh environments.
Typical applications include automotive LED lighting (headlights, daytime running lights), industrial lighting, and general-purpose constant-current LED drivers. Its wide input range and high output voltage capability make it particularly well-suited for LED strings in series, where the total forward voltage can be significant.
When designing with the LT3791, careful attention must be paid to the switching node layout and the selection of external components, such as inductors and MOSFETs, to ensure stable operation and meet EMI requirements. The datasheet provides detailed application circuits and component selection guidelines.
直接替換替代品，適用於 LT3791EFE#TRPBF — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
此系列的變體
與下列產品可直接替換的同系列型號： LT3791EFE#TRPBF （相同外形與佔位） — 差異在於 Dimming, Switching Frequency, Input Voltage Range, Operating Temperature Range.
LT3791EFE#PBF
✅ 直接替換聯絡詢價
查看資料表 →LT3791EFE-1#TRPBF
⚡ 相同封裝📋 參考替代品（不在目錄中）
LT3791EFE-1#PBF
⚡ 相同封裝 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
LT3791HFE#TRPBF
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
LT3791IFE#TRPBF
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
LT3791MPFE#TRPBF
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
LT3791EFE#TRPBF 最大額定值與電氣特性
| 拓撲 | Buck-Boost |
| 輸出數量 | 1 |
| 輸入電壓範圍 | 4.7V to 60V |
| LED String Voltage | Up to 52V |
| 切換頻率 | 200kHz to 700kHz |
| Dimming | Analog and PWM |
| Control Architecture | Current Mode |
| 封裝 | 38-TSSOP-EP |
| 工作溫度範圍 | -40°C to 125°C |
| 安裝類型 | Surface Mount |
| RoHS 狀態 | Compliant |
| REACH Status | Compliant |
| 同步整流 | Yes |
| External MOSFETs | Yes |
LT3791EFE#TRPBF 腳位配置
| 腳位 1 | BOOST1 — Bootstrap capacitor connection for high-side MOSFET |
| 腳位 2 | TG1 — High-side gate drive for switch A |
| 腳位 3 | SW1 — Switch node for switch A |
| 腳位 4 | BG1 — Low-side gate drive for switch A |
| 腳位 5 | VIN — Input supply voltage |
| 腳位 6 | BG2 — Low-side gate drive for switch B |
| 腳位 7 | SW2 — Switch node for switch B |
| 腳位 8 | TG2 — High-side gate drive for switch B |
| 腳位 9 | BOOST2 — Bootstrap capacitor connection for high-side MOSFET |
| 腳位 10 | VOUT — Output voltage sense |
| 腳位 11 | SENSE — Current sense input |
| 腳位 12 | CTRL1 — Control input for analog dimming |
| 腳位 13 | CTRL2 — Control input for PWM dimming |
| 腳位 14 | SS — Soft-start capacitor connection |
| 腳位 15 | FREQ — Switching frequency set resistor |
| 腳位 16 | SYNC — External clock synchronization input |
| 腳位 17 | VREF — Reference voltage output |
| 腳位 18 | GND — Ground |
| 腳位 19 | GND — Ground |
| 腳位 20 | GND — Ground |
| 腳位 21 | GND — Ground |
| 腳位 22 | GND — Ground |
| 腳位 23 | GND — Ground |
| 腳位 24 | GND — Ground |
| 腳位 25 | GND — Ground |
| 腳位 26 | GND — Ground |
| 腳位 27 | GND — Ground |
| 腳位 28 | GND — Ground |
| 腳位 29 | GND — Ground |
| 腳位 30 | GND — Ground |
| 腳位 31 | GND — Ground |
| 腳位 32 | GND — Ground |
| 腳位 33 | GND — Ground |
| 腳位 34 | GND — Ground |
| 腳位 35 | GND — Ground |
| 腳位 36 | GND — Ground |
| 腳位 37 | GND — Ground |
| 腳位 38 | GND — Ground |
典型應用
LT3791EFE#TRPBF 適用於 6 應用s: 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 -40°C to 125°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.
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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.
推薦
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.
推薦
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.
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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.
推薦
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 -40°C to 125°C range handles extreme temperatures.
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推薦產品摘要
工程參考資料，適用於 LT3791EFE#TRPBF — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 | 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 | -40°C to 125°C | -40°C to 125°C | -40°C to 125°C | -40°C to 150°C |
| RoHS | Compliant | Compliant | Compliant | Compliant |
主要差異化特點
- 4-switch synchronous buck-boost topology (對比LT3791EFE-1#TRPBF)
- Wide input voltage range (4.7V to 60V) (對比LT3791EFE#PBF)
- High LED string voltage capability (up to 52V) (對比LT3791EFE-1#TRPBF)
設計說明
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.
合規資訊
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.
