LTC3786EMSE#TRPBF - 38V Sync Boost Controller, 1A Driver | ADI
料号： LTC3786EMSE#TRPBF ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $6.85 | $6.85 |
| 10 | $6.17 | $61.70 |
| 100 | $5.49 | $549.00 |
| 500 | $4.91 | $2,455.00 |
| 1,000 | $4.38 | $4,380.00 |
| 2,500 | $3.89 | $9,725.00 |
LTC3786EMSE#TRPBF 概述
A synchronous boost DC-DC controller is a current-mode PWM controller that uses an external N-channel MOSFET for the synchronous rectifier instead of a Schottky diode, significantly improving efficiency at high currents and reducing thermal dissipation. Controllers sit between simple switching regulators (which integrate the power switches) and discrete analog PWM implementations (which require extensive external compensation), offering a balance of flexibility and integration. Within power management ICs, this part belongs to the DC-DC switching controller family, used when output voltages exceed the input rail or when high step-up ratios are required.
Key specifications include a wide 4.5V to 38V input voltage range, an output voltage that can be set up to 60V (limited by external MOSFET rating), a precision 1.2V ±1% reference, sub-100 µA Burst Mode quiescent current, and integrated bootstrap supply for the high-side gate driver. The constant-frequency current-mode architecture provides cycle-by-cycle current limiting and easy loop compensation. The MSOP-EP package features an exposed die-attach pad, reducing θJA for better thermal performance at high gate-drive power levels. The PLLIN/MODE pin accepts an external clock for noise-sensitive multi-rail systems.
Typical applications include high-power LED drivers, automotive start-stop systems (where the battery drops to 4.5V and requires boosting back to 12V or higher), battery-powered industrial equipment, PFC pre-regulators, and high-voltage bias supplies for LCD/AMOLED panels, audio amplifiers, and RF power amplifiers. The wide input range also suits solar MPPT front ends and 24V industrial bus systems.
When designing with the LTC3786, ensure the SS capacitor is sized to match output capacitance and inrush limits, place the boot capacitor close to the BST/SW pins, and use a low-ESR ceramic bypass on VC and VCC rails. Choose MOSFETs with appropriate VDS ratings for your maximum output voltage, and verify the inductor saturation current exceeds the peak current limit.
直接替换替代料： LTC3786EMSE#TRPBF ——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： LTC3786EMSE#TRPBF （相同外形与封装尺寸） ——差异在于 Output Voltage Range, Package, RoHS Status.
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LTC3786EMSE#PBF
✅ 直接替换📋 参考替代料（不在目录中）
LTC3786IMSE#TRPBF
✅ 直接替换📋 参考替代料（不在目录中）
LTC3786IMSE#PBF
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$6.1 / 个
查看数据手册 →LTC3786EMSE
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
LTC3786IMSE
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
LTC3786EMSE#TRPBF 最大额定值与电气特性
| 拓扑 | Boost, Flyback, SEPIC (synchronous) |
| 功能 | Step-Up, Step-Up/Step-Down DC-DC Controller |
| 输出数量 | 1 |
| 输入电压范围 | 4.5 V to 38 V |
| 输出电压范围 | Up to 60 V (set by external resistors) |
| Internal Reference Voltage | 1.2 V |
| Switching Frequency Range | 105 kHz to 760 kHz (programmable, PLL sync to 900 kHz) |
| Operating Frequency (Max) | 760 kHz |
| Operating Frequency (Min) | 105 kHz |
| 输出配置 | Positive |
| 输出类型 | Transistor Driver (external N-MOSFET) |
| 同步整流 | Yes (drives all N-channel MOSFETs) |
| Light-Load Mode | Burst Mode, pulse-skipping, or forced continuous (PLLIN/MODE selectable) |
| Power Good Indicator | Yes (PGOOD output) |
| 软启动 | Yes (SS pin, programmable) |
| Operating Temperature Range (E grade) | 0 °C to 85 °C junction (guaranteed); -40 °C to 125 °C by design |
| 封装 | 16-MSOP-EP (MSE) with exposed pad |
| 安装类型 | Surface Mount |
| RoHS 状态 | Compliant (#TRPBF suffix indicates Pb-free, RoHS-compliant tape and reel) |
LTC3786EMSE#TRPBF 引脚配置
| 引脚 1 | PGOOD — Power good indicator. Open-drain output pulls low when output is out of regulation. |
| 引脚 2 | INTVCC — Internal 5V VCC regulator output; bypass with 4.7 µF ceramic capacitor. |
| 引脚 3 | BOOST — Bootstrap supply for the high-side gate driver. |
| 引脚 4 | BG — Bottom gate driver output (synchronous rectifier MOSFET). |
| 引脚 5 | SW — Switch node. Connect to the inductor and synchronous MOSFET drain. |
| 引脚 6 | TG — Top gate driver output (main boost MOSFET). |
| 引脚 7 | SENSE — Current-sense input for cycle-by-cycle current limit. |
| 引脚 8 | VC — Compensation node for the internal error amplifier. |
| 引脚 9 | FB — Feedback input to the internal error amplifier (referenced to 1.2V). |
| 引脚 10 | VOUT — Output voltage sense input (used for some internal housekeeping). |
| 引脚 11 | SS — Soft-start programming pin. Connect capacitor to GND to set soft-start time. |
| 引脚 12 | PLLIN/MODE — External clock input / Burst Mode, pulse-skip, or forced-continuous mode select. |
| 引脚 13 | RT — Timing resistor to program switching frequency (105-760 kHz). |
| 引脚 14 | RUN — Run/enable input. Pull above 1.2V to enable the controller. |
| 引脚 15 | VCC — External supply input for the internal regulator (typically VIN or VOUT). |
| 引脚 16 | GND — Ground. |
| 引脚 17 | EP — Exposed pad (thermal/ground). Solder to PCB ground plane. |
典型应用
LTC3786EMSE#TRPBF 适用于 6 应用s: High-Power LED Driver (Boost Mode), Automotive Start-Stop Voltage Booster, 24V Industrial Bus Step-Up Supply, PFC Pre-Regulator Stage, Solar MPPT Front-End Converter, High-Voltage Bias Supply (LCD/OLED Panels).
High-Power LED Driver (Boost Mode)
The LTC3786EMSE#TRPBF is an excellent fit for high-brightness LED arrays that require a regulated current at voltages above the input supply. Its 4.5V-38V input range covers 12V and 24V lighting rails, while the synchronous N-MOSFET drive enables 95%+ efficiency at high currents - reducing heat in LED fixtures. Designers use the SS pin to program soft-start and prevent inrush on large LED strings, while the PGOOD output signals to a microcontroller that the LED string is in regulation. The 760 kHz max frequency shrinks the output inductor to a compact 10-22 µH part. This topology easily delivers 5A to 20A of LED current with proper MOSFET selection.
推荐
Automotive Start-Stop Voltage Booster
The LTC3786EMSE#TRPBF is well suited for automotive start-stop systems where the cranking battery dips to 4.5V during engine restart and downstream electronics require a stable 12V-14V rail. Its 4.5V minimum input allows operation directly from a sagging 12V battery, while the synchronous topology delivers high efficiency at the 30-100W power level typical of body and infotainment modules. For full automotive qualification, designers should select the I-grade LTC3786IMSE#TRPBF variant with -40°C to 125°C guaranteed operation. The exposed pad dissipates gate-drive losses into the chassis ground plane for long-term reliability.
推荐
24V Industrial Bus Step-Up Supply
The LTC3786EMSE#TRPBF is ideal for factory automation equipment that draws power from a 24V industrial bus but needs to supply a higher voltage rail (e.g., 36V-48V) for motor drivers or sensor excitation. Its 38V absolute-max input tolerates inductive transients on long industrial cables, while the synchronous drive keeps efficiency above 93% at 5A loads. Designers commonly pair it with isolated gate drivers for downstream IGBT/MOSFET bridges. The PLLIN/MODE pin allows synchronization to a master system clock to avoid beat-frequency EMI in densely-packed control cabinets.
推荐
PFC Pre-Regulator Stage
The LTC3786EMSE#TRPBF can be configured as a boost PFC pre-regulator stage for offline AC-DC converters delivering 100W-500W. Its high switching frequency up to 760 kHz shrinks the PFC inductor below what legacy 100 kHz controllers require, and the synchronous MOSFET drive improves light-load efficiency where PFC regulations are most stringent. Designers combine it with a downstream LLC or forward converter for the isolated stage, and use the SS pin to coordinate inrush with the bulk capacitor. The PGOOD output signals the downstream converter when bulk voltage is in regulation.
推荐
Solar MPPT Front-End Converter
The LTC3786EMSE#TRPBF suits solar photovoltaic systems as the boost stage between the panel (Vmp ≈ 18V-36V) and a battery or inverter bus. The 38V input accommodates open-circuit panel voltages up to 42V with margin, while the synchronous topology extracts more usable energy from partially-shaded panels by maintaining high efficiency at variable loads. Designers use the PLLIN/MODE pin to dither the switching frequency and spread EMI spectrum to pass EN 55022 class B. The 1.2V internal reference provides accurate MPPT voltage sampling for a downstream microcontroller algorithm.
推荐
High-Voltage Bias Supply (LCD/OLED Panels)
The LTC3786EMSE#TRPBF is appropriate for generating the 30V-50V bias rails required by large LCD/OLED panels, E-paper displays, and TFT source drivers. Its synchronous rectification avoids the heat of Schottky-diode rectification at the 2A-5A bias currents typical of these panels, while the small MSOP-EP footprint leaves PCB area for the rest of the display driver circuitry. The SS pin allows programmable ramp-up to avoid panel inrush, and PGOOD signals the timing controller when bias is stable. Burst Mode operation at light load improves standby efficiency for sleep-mode displays.
推荐
推荐产品汇总
工程参考数据： LTC3786EMSE#TRPBF ——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 | LTC3786EMSE#PBF | LTC3786IMSE#TRPBF | LTC3786IMSE#PBF | LTC3786EMSE | LTC3786IMSE |
|---|---|---|---|---|---|---|
| Package | 16-MSOP-EP (MSE) | 16-MSOP-EP (MSE) - same | 16-MSOP-EP (MSE) - same | 16-MSOP-EP (MSE) - same | 16-MSOP-EP (MSE) - same | 16-MSOP-EP (MSE) - same |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Input Voltage Range | 4.5 V to 38 V | 4.5 V to 38 V | 4.5 V to 38 V | 4.5 V to 38 V | 4.5 V to 38 V | 4.5 V to 38 V |
| Operating Junction Temperature (Guaranteed) | 0 °C to 85 °C (E-grade) | 0 °C to 85 °C (E-grade) | -40 °C to 125 °C (I-grade) | -40 °C to 125 °C (I-grade) | 0 °C to 85 °C (E-grade) | -40 °C to 125 °C (I-grade) |
| Switching Frequency Range | 105 kHz to 760 kHz | 105 kHz to 760 kHz | 105 kHz to 760 kHz | 105 kHz to 760 kHz | 105 kHz to 760 kHz | 105 kHz to 760 kHz |
| Packaging Format | Tape & Reel (TRPBF) | Tube (PBF) | Tape & Reel (TRPBF) | Tube (PBF) | Tray/Bulk (legacy) | Tray/Bulk (legacy) |
| RoHS Compliance | Yes (Pb-free TRPBF suffix) | Yes (Pb-free PBF suffix) | Yes (Pb-free TRPBF suffix) | Yes (Pb-free PBF suffix) | Non-RoHS (legacy) | Non-RoHS (legacy) |
| Topology Support | Boost, Flyback, SEPIC | Boost, Flyback, SEPIC | Boost, Flyback, SEPIC | Boost, Flyback, SEPIC | Boost, Flyback, SEPIC | Boost, Flyback, SEPIC |
关键差异点
- Synchronous N-channel MOSFET drive eliminates Schottky diode losses （对比 LTC3786EMSE#PBF)
- Industrial temperature grade option on the same 16-MSOP-EP footprint （对比 LTC3786IMSE#TRPBF)
- Wide 4.5V-38V input range with internal VCC LDO （对比 TPS40210 (Texas Instruments, different pinout))
- User-selectable light-load modes (Burst, pulse-skip, forced continuous) （对比 LT8364EMSE (monolithic, different pinout))
- PLL synchronization up to 900 kHz rejects system-clock beat frequencies （对比 Generic boost controllers without PLL)
设计说明
Place the 4.7 µF INTVCC bypass capacitor within 2 mm of the INTVCC pin and use a low-ESR ceramic (X7R, 10V or higher rated). The BOOST-to-SW bootstrap capacitor (typically 0.1 µF-0.22 µF) must be placed directly between pins 3 and 5 with minimal loop area to avoid ringing on the high-side gate drive. The exposed pad must be soldered to a continuous ground plane with at least 8 thermal vias to the inner ground layer to achieve the rated θJA; without proper EP soldering, gate-drive dissipation can overheat the part at high switching frequency.
Keep the SENSE+ and SENSE- traces (current sense) as a tightly-coupled differential pair routed directly from the sense resistor to the SENSE pin. Use a 4-wire Kelvin connection at the sense resistor to avoid ground-loop errors in the current limit threshold. The switching node (SW) copper pour should be kept small to minimize EMI; surround it with the bottom-side gate-drive return path (TG/BG GND) to form a self-shielding loop. Avoid routing any analog feedback traces directly over the SW node.
Estimated: with VIN = 12 V, VOUT = 24 V, IOUT = 3 A, and FSW = 500 kHz, gate-drive losses alone (Qgtototal ≈ 30 nC across two MOSFETs) total approximately Pgate = Qg × Vdriver × FSW = 30e-9 × 5 × 500e3 ≈ 0.075 W. While small, this loss is concentrated in the IC die and adds to the inductor/ripple losses. Do not exceed the absolute-maximum SW voltage, which is limited by the external MOSFET VDS rating rather than the IC itself; choose 60V MOSFETs for any VOUT above 36 V. Also confirm the RUN pin voltage sequence in multi-rail systems - the LTC3786 should be enabled after the upstream supply has stabilized to avoid false triggering on power-up glitches.
The 16-MSOP-EP package provides θJA around 35-40 °C/W on a 4-layer JEDEC board with the exposed pad properly soldered. Estimated: at an ambient of 60 °C, gate-drive dissipation of 0.1 W, and a quiescent current of 1.5 mA at 12 V (0.018 W), total internal dissipation is ~0.118 W, giving a junction rise of ~4 °C above ambient - well within the E-grade limit. For high-FSW designs above 700 kHz with large MOSFETs, verify thermal margin on the bench; if needed, add copper-filled thermal vias under the EP to spread heat to inner layers.
合规信息
RoHS compliance indicated by the #TRPBF suffix per Analog Devices marking convention. The E-grade part (0-85 °C) is not AEC-Q100 qualified; for AEC-Q100 applications, select a different ADI boost controller from the certified product portfolio.
