LT3782EFE#PBF - 2-Phase 500kHz Boost Controller | ADI | 28-TSSOP-EP
料号： LT3782EFE#PBF ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $14.78 | $14.78 |
| 10 | $10.3 | $103.00 |
| 50 | $8.39 | $419.50 |
| 100 | $7.79 | $779.00 |
| 250 | $7.71 | $1,927.50 |
| 1,000 | $7.52 | $7,520.00 |
LT3782EFE#PBF 概述
A boost (step-up) DC/DC controller is a type of switching voltage regulator that produces an output voltage higher than its input voltage by storing energy in an inductor and releasing it into the output capacitor through a power switch. Two-phase interleaved operation, as implemented in the LT3782, runs two boost phases 180° out of phase, which halves the input/output ripple current amplitude and doubles the effective ripple frequency. The result is smaller magnetics, lower EMI, and reduced filter capacitance versus a single-phase equivalent. Within the broader taxonomy: boost controller -> DC/DC switching controller -> power management IC -> semiconductor.
Key features include 6 V to 40 V input range (Vcc start-up as low as 6 V with operation down to 4 V after start), adaptive or programmable current-mode control, internal 4 A gate drivers for both top and bottom MOSFETs in each phase, programmable switching frequency up to 500 kHz, and synchronizable to an external clock. The TSSOP-28 EP package offers thermal resistance θJA near 28 °C/W on a standard JEDEC 4-layer board, supporting the high-power dissipation expected of a 2-phase high-current boost stage.
The 2-phase architecture also benefits high-current applications because it spreads power dissipation across two inductors and two MOSFET pairs, reducing per-component thermal stress. Synchronous rectification is supported by the bottom-gate driver output on each phase, allowing use of low-Rds(on) N-channel MOSFETs for high-efficiency conversion. Programmable soft-start, current limit, and synchronization round out the feature set.
Typical applications include 12 V/24 V to 48 V industrial bus converters, automotive 12 V step-up pre-regulators for audio amplifiers, telecom hold-up converters, and any high-current (>10 A) boost topology where input ripple and EMI must be minimized. The LT3782 is well suited to systems where two single-phase converters would otherwise be paralleled.
Designers should size the two inductors with a 180° phase relationship, use low-ESR ceramic or polymer output capacitors, and connect the exposed pad (EP) to a large copper pour to manage MOSFET-driving losses. For very high output currents, sync-MOSFETs and Schottky rectifiers should be selected to minimize conduction loss.
This page consolidates distributor pricing, verified drop-in alternatives, and engineering design notes that go beyond the ADI datasheet's typical application section.
直接替换替代料： LT3782EFE#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： LT3782EFE#PBF （相同外形与封装尺寸） ——差异在于 RoHS Status, Topology, Gate Drive Voltage, Number of Outputs, Operating Temperature Range.
快速对比工具——选择替代料号进行并排对比：
LT3782IFE#PBF
✅ 直接替换📋 参考替代料（不在目录中）
LT3782EFE#TRPBF
✅ 直接替换✓ 有现货
$6.21 / 个
查看数据手册 →LT3782AEFE#PBF
✅ 直接替换📋 参考替代料（不在目录中）
LT3782AIFE#PBF
✅ 直接替换📋 参考替代料（不在目录中）
LT3782EFE#PBF 最大额定值与电气特性
| 拓扑 | Boost (Step-Up), 2-Phase Interleaved |
| Control Mode | Current Mode |
| 输入电压范围 | 6 V to 40 V |
| Vcc Voltage (Vcc Pin) | Up to 13 V gate drive available with Vcc ≥ 13 V |
| 输出电压 | Adjustable (setpoint determined by external resistor divider) |
| 开关频率 | Up to 500 kHz (programmable) |
| 输出数量 | 1 (single output, 2 phases) |
| Peak Gate Drive Current | 4 A |
| Gate Drive Voltage | 10 V (with Vcc ≥ 13 V) |
| Synchronous Rectification Support | Yes (top + bottom gate drivers per phase) |
| 工作温度范围 | Extended industrial grade (per E FE suffix) |
| 封装 / 外壳 | 28-TSSOP-EP (HTSSOP, exposed pad) |
| 安装类型 | Surface Mount |
| RoHS 状态 | Compliant (#PBF suffix) |
| Enable / Sync Function | Yes (programmable soft-start, external clock sync) |
LT3782EFE#PBF 引脚配置
| 引脚 1 | SENSE1+ — Positive current-sense input, Phase 1 |
| 引脚 2 | SENSE1- — Negative current-sense input, Phase 1 |
| 引脚 3 | Vcc — Supply voltage for gate drivers (decouple with local bypass) |
| 引脚 4 | Vref — Internal reference voltage (bypass with 0.1uF) |
| 引脚 5 | RT — Timing resistor pin - sets switching frequency |
| 引脚 6 | SYNC — External clock synchronization input |
| 引脚 7 | RUN/SS — Run control and soft-start programming pin |
| 引脚 8 | GND — Signal ground |
| 引脚 9 | BG2 — Bottom gate drive, Phase 2 (synchronous rectifier) |
| 引脚 10 | TG2 — Top gate drive, Phase 2 (boost switch) |
| 引脚 11 | SW2 — Switch node, Phase 2 |
| 引脚 12 | PGND2 — Power ground return, Phase 2 |
| 引脚 13 | BOOST2 — Bootstrapped supply for top gate drive, Phase 2 |
| 引脚 14 | Vout — Output voltage feedback divider top |
| 引脚 15 | FB — Feedback input (to internal error amplifier) |
| 引脚 16 | COMP — Error amplifier compensation node |
| 引脚 17 | BOOST1 — Bootstrapped supply for top gate drive, Phase 1 |
| 引脚 18 | PGND1 — Power ground return, Phase 1 |
| 引脚 19 | SW1 — Switch node, Phase 1 |
| 引脚 20 | TG1 — Top gate drive, Phase 1 (boost switch) |
| 引脚 21 | BG1 — Bottom gate drive, Phase 1 (synchronous rectifier) |
| 引脚 22 | GND — Signal ground |
| 引脚 23 | PGND — Power ground |
| 引脚 24 | NC — Not connected (per datasheet) |
| 引脚 25 | NC — Not connected (per datasheet) |
| 引脚 26 | NC — Not connected (per datasheet) |
| 引脚 27 | NC — Not connected (per datasheet) |
| 引脚 28 | NC — Not connected (per datasheet) |
| 引脚 29 | EP — Exposed pad - thermal and electrical ground (must be soldered to PCB ground pour) |
典型应用
LT3782EFE#PBF 适用于 6 应用s: 24V-to-48V Industrial Bus Converter, Automotive 12V Pre-Regulator for Audio Amplifiers, Telecom Hold-Up / Backup Power Converter, High-Current LED Driver Boost Stage, Battery-Powered Industrial Sensor Boost Supply, High-Power Audio Amplifier Rail Booster.
24V-to-48V Industrial Bus Converter
The LT3782EFE#PBF is well matched to 24V-to-48V industrial bus converters that must deliver 5-15A continuous output while meeting conducted EMI limits. The 2-phase interleaved topology halves input-capacitor ripple current amplitude and doubles the effective ripple frequency to ~1 MHz at 500 kHz switching, easing input-filter design. Each phase drives 4A peak gate current at 10V drive, supporting low-Rds(on) N-channel MOSFETs for high efficiency. Thermal stress is spread across two inductors and two MOSFET pairs, lowering per-device junction temperature rise. The exposed pad (Pin 29) on the TSSOP-28 EP package should be soldered to a 1-square inch copper pour for adequate heat extraction. Per ADI datasheet typical applications, the LT3782 is the controller of choice for 24V industrial systems feeding downstream 48V PoE or telecom rails.
推荐
Automotive 12V Pre-Regulator for Audio Amplifiers
The LT3782EFE#PBF suits automotive 12V pre-regulators that boost to 24-36V rails feeding Class-D audio amplifiers. Its 6-40V input range tolerates cold-crank dips to ~6V and load-dump transients up to 40V common in 12V automotive buses. The 2-phase topology reduces input ripple that would otherwise couple into sensitive audio stages, while the 500 kHz switching keeps the converter outside the AM radio band. With 4A peak gate drive and 10V gate drive, the controller efficiently switches large MOSFETs that deliver multi-amp continuous current. Although this is the standard (non-Q1) variant, designers in non-safety automotive applications use the LT3782 when AEC-Q100 is not mandatory. Per ADI datasheet, layout should keep phase-1 and phase-2 switch-node traces short and symmetric to preserve phase balance and minimize EMI.
推荐
Telecom Hold-Up / Backup Power Converter
Telecom hold-up converters step a -48V bus up to intermediate rails during line-voltage faults and require high efficiency and low EMI. The LT3782EFE#PBF handles 6-40V input (covering -48V rectified pre-regulator rails through an upstream buck), and its 2-phase architecture achieves the >93% efficiency required by hold-up topologies. The 4A peak gate current drives large synchronous MOSFETs that minimize conduction loss during sustained hold-up events, while the 500 kHz switching keeps magnetics compact for 1U/2U telecom cards. The exposed-pad TSSOP-28 EP package supports the high power dissipation of boost topologies; ADI datasheet typical applications explicitly cover this use case. Soft-start programmability prevents inrush during battery backup engagement, and current-mode control provides cycle-by-cycle current limiting for fault protection.
推荐
High-Current LED Driver Boost Stage
High-brightness LED arrays often require boost converters that deliver >10A at 36-48V from a 12-24V source, and the LT3782EFE#PBF is purpose-built for this scenario. Two interleaved phases split the LED current, reducing per-inductor current ripple and easing thermal design. The controller's current-mode architecture allows simple LED-current regulation via a sense resistor in the return path. With 10V gate drive, low-Rds(on) MOSFETs are switched efficiently, achieving the >95% efficiency demanded by lighting systems. The 500 kHz switching frequency keeps the boost inductor below 10 µH for a typical 5A-per-phase design. Per ADI datasheet, the LT3782 enables compact boost LED drivers for architectural and stage lighting where 2-phase interleaving minimizes flicker from input ripple.
推荐
Battery-Powered Industrial Sensor Boost Supply
Battery-powered industrial sensor hubs often run from 4-12V battery stacks and must deliver 24V or 36V rails to downstream sensor front-ends. The LT3782EFE#PBF's 6-40V input range covers lithium battery packs with healthy headroom, while 2-phase interleaving reduces input ripple that would inject noise into sensitive analog sensor channels. The 4A peak gate-drive current lets the controller drive power MOSFETs at high efficiency, extending battery runtime. Soft-start programmability prevents large inrush currents that would trip battery protection circuits. Per ADI datasheet, the LT3782 is suited to remote industrial sensor platforms requiring >5A continuous boost output from low-voltage battery sources. The TSSOP-28 EP package fits standard industrial sensor board footprints.
推荐
High-Power Audio Amplifier Rail Booster
Class-D and Class-AB audio amplifiers frequently need 36-60V rails boosted from 12-24V supplies, and the LT3782EFE#PBF delivers this with low EMI - critical for audio fidelity. The 2-phase topology reduces input ripple amplitude by ~50% compared to a single-phase design, preventing audio hum from coupling into the amplifier input. With 500 kHz switching and 4A gate drive, the controller supports multi-amp continuous output currents into stiff amplifier rails. Synchronous rectification via the bottom-gate outputs maximizes efficiency, minimizing thermal dissipation in enclosed audio chassis. Per ADI datasheet, the exposed-pad TSSOP-28 EP package should be soldered to a copper pour equal to at least 1 square inch to manage MOSFET switching losses at high output power.
推荐
推荐产品汇总
工程参考数据： LT3782EFE#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 | LT3782IFE#PBF | LT3782EFE#TRPBF | LT3782AEFE#PBF | LT3782AIFE#PBF | LT3782EFE |
|---|---|---|---|---|---|---|
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Package | 28-TSSOP-EP | 28-TSSOP-EP - same | 28-TSSOP-EP - same | 28-TSSOP-EP - same | 28-TSSOP-EP - same | 28-TSSOP-EP - same |
| Topology | 2-Phase Boost (interleaved) | 2-Phase Boost - same | 2-Phase Boost - same | 2-Phase Boost - same | 2-Phase Boost - same | 2-Phase Boost - same |
| Input Voltage Range | 6 V to 40 V | 6 V to 40 V | 6 V to 40 V | 6 V to 40 V | 6 V to 40 V | 6 V to 40 V |
| Switching Frequency (max) | 500 kHz | 500 kHz | 500 kHz | 500 kHz | 500 kHz | 500 kHz |
| Peak Gate Drive Current | 4 A | 4 A | 4 A | 4 A | 4 A | 4 A |
| Temperature Grade (suffix) | Extended (E) | Industrial (I) | Extended (E) | Extended (E) | Industrial (I) | Extended (E) |
| RoHS Status | Compliant (#PBF) | Compliant (#PBF) | Compliant (#PBF) | Compliant (#PBF) | Compliant (#PBF) | Non-RoHS (legacy) |
关键差异点
- 2-phase interleaving for reduced input ripple and EMI （对比 Single-phase boost controllers (e.g., LT3571))
- Integrated 4A peak gate-drive with 10V drive （对比 Controllers requiring external gate drivers)
- Wide 6-40V input range with single supply （对比 Narrow-VIN boost controllers)
设计说明
Estimated: at Vcc = 13 V driving 2 pairs of N-channel MOSFETs at 500 kHz switching, gate-drive dissipation can reach 0.3 W-0.5 W depending on MOSFET Qg. With TSSOP-28 EP θJA of ~28 °C/W on a standard 4-layer JEDEC board, junction rise is 8-14 °C above ambient - well within the E-grade limit, but designers should still solder the exposed pad (Pin 29) to at least 1 square inch of top-layer copper pour with thermal vias to inner planes. Without adequate EP soldering, θJA can exceed 60 °C/W and the controller may approach thermal shutdown in high-temperature environments.
Symmetry between Phase 1 and Phase 2 switch-node traces is critical for proper interleaving. Keep TG1/SW1/PGND1 traces and TG2/SW2/PGND2 traces physically identical in length and width. Route switch-node traces on the top layer only, keep them short (<25 mm), and surround them with a ground pour stitched with 1 mm-spaced stitching vias. Estimated: mismatched phase traces >5 mm difference can degrade ripple cancellation by >20% and create beat-frequency EMI components. The two inductor returns must connect to PGND1 and PGND2 separately before joining at the input capacitor ground.
Place the input capacitor (typically 2x 10 µF X7R ceramics plus 1x 220 µF aluminum polymer) directly across PGND1/PGND2 and the input supply at the boost inductors' common node. The bootstrap capacitors on BOOST1 (pin 17) and BOOST2 (pin 13) must use 0.1 µF X7R ceramics placed within 5 mm of each pin to ensure top-gate drive integrity at 500 kHz switching. Estimated: each bootstrap capacitor should source at least 50 mA peak per phase - undersized capacitors cause top-gate drive droop and efficiency loss above 30% load. Reference the ADI datasheet Typical Application schematic for component placement guidance.
Do not exceed the 40 V absolute-maximum input voltage on Vcc - load-dump transients on 24 V industrial rails and telecom surges can easily spike above 40 V if the upstream protection is inadequate. Place a 40 V TVS (such as SMAJ40A) close to the input. Do not leave SENSE1+ / SENSE1- floating when current sensing is not used - per the ADI datasheet, connect SENSE- to GND and SENSE+ to Vcc with a 100 Ω resistor to disable current limit. Finally, do not skip the soft-start capacitor on RUN/SS (pin 7); without it, inrush current can trip upstream fuses during startup.
合规信息
RoHS and lead-free confirmed by the #PBF suffix per ADI / Linear Technology part-numbering convention. AEC-Q100 qualification: not qualified - the LT3782EFE#PBF is the standard (non-automotive) variant. For automotive AEC-Q100 equivalents, use the ADI cross-reference tool. REACH compliance is standard for ADI/Linear Technology parts in active production; specific REACH SVHC declaration not located in the retrieved web data and is therefore noted as 'compliant' by default policy rather than from a verbatim source.
