LTM8047 - Isolated Flyback uModule DC/DC, 32V In | Analog Devices
部品番号: LTM8047 ✓ 生産中| 数量 | 単価 | 小計 |
|---|---|---|
| 1 | $18.45 | $18.45 |
| 10 | $16.85 | $168.50 |
| 100 | $14.9 | $1,490.00 |
| 500 | $13.6 | $6,800.00 |
| 1,000 | $12.3 | $12,300.00 |
LTM8047 概要
An isolated DC/DC converter is a switching power converter in which the input and output share no galvanic connection; energy is transferred across a transformer, breaking ground loops and providing an isolation barrier. Within the power management hierarchy, the LTM8047 belongs to the family of system-in-package power modules (uModules), which integrate a switching controller, power switches, a transformer, and all support components into a single surface-mount device.
Key features include the 725VDC isolation rating (tested at 725VDC for one second in each polarity, per the manufacturer datasheet), a wide 3.1V to 32V input range suitable for unregulated industrial and automotive rails, and full integration of the flyback power stage. Because the transformer is built into the package, designers eliminate the most difficult part of isolated-supply design: magnetics selection, layout, and creepage management.
The LTM8047 uses a flyback architecture in which the controller drives integrated power switches and a coupled inductor. Output voltage is set with a small number of external resistors, and a soft-start pin (SS) sources approximately 10uA during startup, per the datasheet, enabling controlled power-up. The device is also usable in inverting and SEPIC configurations per manufacturer documentation.
Typical applications include isolated bias supplies for industrial PLCs, isolated sensor and transducer interfaces, isolated communication port power (RS-485/CAN bias rails), and negative or SEPIC rail generation where a single small module replaces a discrete transformer-based design.
A key design consideration is thermal: as a fully integrated module, power dissipation depends on VIN/VOUT/frequency setting, so copper area under the package ground pads governs junction temperature. Verify output current derating at your operating point in the datasheet thermal curves.
This page synthesizes distributor pricing, drop-in family alternatives, and practical design notes not found in the manufacturer datasheet, with price data as of 2026-10-19.
ドロップイン代替品: LTM8047 — 同一パッケージでピン互換。PCBの作り直しが必要な異なるパッケージの部品は除外されています。
クイック比較ツール — 並列比較する代替部品を選択:
LTM8048
✅ ドロップイン📋 参考代替品（カタログ未掲載）
LTM8049
✅ ドロップイン📋 参考代替品（カタログ未掲載）
LTM8047MPY
✅ ドロップイン📋 参考代替品（カタログ未掲載）
LTM8047IY
✅ ドロップイン ⚠️ 仕様未検証📋 参考代替品（カタログ未掲載）
LTM8047EY
✅ ドロップイン ⚠️ 仕様未検証📋 参考代替品（カタログ未掲載）
LTM8047 最大定格＆電気的特性
| トポロジー | Isolated Flyback uModule DC/DC Converter |
| 入力電圧範囲 | 3.1 V to 32 V |
| 出力電圧範囲 | 2.5 V to 12 V |
| 最大出力電流 | 440 mA (LTM8047MPY, per DigiKey listing) |
| 出力数 | 1 (isolated) |
| Isolation Rating | 725 VDC (tested 1 second, each polarity) |
| Integrated Components | Switching controller, power switches, transformer, support components |
| Configuration Options | Isolated flyback; also supports inverting and SEPIC operation |
| Soft-Start Current | Approximately 10 uA out of SS pin (per datasheet) |
| 動作温度範囲 | -40C to +125C internal (E grade: 0C to +125C guaranteed) |
| 実装タイプ | Surface Mount (BGA/LGA-style module package) |
| パッケージ | uModule BGA/LGA module, 6.25 mm x 9 mm class |
| 1ku List Price | Starting from $12.30 (as of 2026-10-19) |
LTM8047 umodule bga/lga module, 6.25 mm x 9 mm class ピン配置ガイド
LTM8047 (umodule bga/lga module, 6.25 mm x 9 mm class パッケージ) のピン配置。 このパワーデバイスは、ゲート、ドレイン、ソース端子を備えています。非極性パッケージの場合、正確なピン1の向きとフットプリントの詳細については、メーカーのデータシートを参照してください。主な用途には、電源設計、モータ駆動、負荷スイッチングがあります。
詳細なピン配置データはありません: LTM8047.
詳細は データシート をご参照ください。
主な用途
LTM8047 の用途: 6 件s: Industrial PLC Isolated Bias Supply, Isolated RS-485 / CAN Communication Ports, Isolated Sensor and Transducer Interfaces, Negative Rail Generation (Inverting Configuration), SEPIC Single-String Power Conversion, Instrumentation and Test Equipment Isolated Supplies.
Industrial PLC Isolated Bias Supply
The LTM8047 fits industrial PLC I/O card power because its 3.1V to 32V input accepts nominal 24V industrial rails with wide tolerance, while the 725VDC isolation barrier separates the field-side domain from controller logic. Because the switching controller, power switches, and transformer are all integrated in one surface-mount module, a design team can add an isolated rail with only a handful of external resistors and capacitors, eliminating custom magnetics risk. Output is programmable from 2.5V to 12V, covering isolated transceiver and sensor rails. The trade-off is thermal: available output current falls as VIN-VOUT stress rises, so check the datasheet derating curves at the actual operating point.
おすすめ
Isolated RS-485 / CAN Communication Ports
Isolated fieldbus ports need a small, isolated 3.3V or 5V bias rail on the bus side. The LTM8047 serves this directly: set the isolated output anywhere from 2.5V to 12V with a resistor divider, and use the 725VDC isolation rating as the galvanic barrier required to prevent ground loops between node electronics and the transceiver domain. The fully integrated transformer avoids the creepage and layout pitfalls of discrete flyback designs, and the wide 3.1V to 32V input tolerates poorly regulated logic supplies. Standard flyback ripple is acceptable for RS-485 and CAN transceivers; for lower noise, the LTM8048 variant with an integrated LDO post-regulator drops into the same footprint.
おすすめ
Isolated Sensor and Transducer Interfaces
In isolated measurement chains (thermocouples, pressure sensors, pH probes), the LTM8047 powers the floating sensor domain from the controller domain while its 725VDC isolation blocks ground-loop currents that corrupt microvolt-level signals. The single isolated output covers typical sensor rail needs between 2.5V and 12V, and the soft-start pin (approximately 10uA sourced from SS, per the datasheet) gives a controlled power-up that prevents inrush artifacts at measurement turn-on. Because the whole power stage is in one reflow-solderable module, high-channel-count data acquisition boards replicate the circuit cheaply. Verify output current derating for low-power sensors is well within the 440mA MPY-grade capability.
おすすめ
Negative Rail Generation (Inverting Configuration)
Per Analog Devices documentation, the LTM8047 family also operates as an inverting uModule converter with up to 700mA output current. This makes the same footprint useful for generating negative rails (for example -5V or -12V) that op-amps, RF amplifiers, and display bias circuits require, without a second transformer design. Using one qualified module across both isolated and inverting functions across a product family reduces procurement and qualification overhead. In inverting mode there is no isolation requirement, so design attention shifts to thermal management and output ripple: input voltage range and switching frequency settings determine the dissipation and component temperatures in the module.
おすすめ
SEPIC Single-String Power Conversion
The LTM8047 documentation also covers SEPIC operation with up to 700mA output current, enabling a non-isolated step-up/step-down converter from a single integrated module. This is valuable where the input rail can be above or below the required output - such as 12V/24V battery-backed systems feeding a fixed 5V or 12V load. Because SEPIC needs only a single integrated inductor-based power stage here (the transformer is built into the module), the external BOM stays minimal: an output-setting resistor network and input/output capacitors. Efficiency is lower than a dedicated buck at large step ratios, so size copper under the module according to the datasheet thermal application information.
おすすめ
Instrumentation and Test Equipment Isolated Supplies
Bench and modular instruments frequently need small isolated auxiliaries - floating bias for input attenuators, isolated reference domains, or per-channel floating supplies in multi-channel testers. The LTM8047 provides this with a 2.5V to 12V programmable isolated output and a 725VDC barrier in a surface-mount package suitable for automated assembly, replacing hand-wound or vendor-special transformers. The wide 3.1V to 32V input runs from bench backplane rails directly. For reference-grade analog sections, substitute the LTM8048, whose integrated LDO post-regulator suppresses flyback ripple on the same footprint, keeping noise out of precision measurement paths at a modest efficiency cost.
おすすめ
おすすめ製品の概要
エンジニアリング参考データ: LTM8047 — 比較、設計ガイダンス、コンプライアンス情報。
選定ガイド
代替品との比較
| パラメータ | この製品 | LTM8048 | LTM8049 | LTM8047MPY | LTM8047IY |
|---|---|---|---|---|---|
| Package | uModule BGA/LGA module | uModule BGA/LGA module - same family footprint | uModule BGA/LGA module - same family footprint | uModule BGA/LGA module - same | uModule BGA/LGA module - same |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Topology | Isolated flyback (+ inverting/SEPIC modes) | Isolated flyback with LDO post-regulator | Isolated flyback, dual outputs | Isolated flyback | Isolated flyback |
| Input Voltage Range | 3.1 V to 32 V | 3.1 V to 32 V | 3.1 V to 32 V | 3.1 V to 32 V | 3.1 V to 32 V |
| Output Voltage Range | 2.5 V to 12 V | 2.5 V to 12 V (post-regulated) | 2.5 V to 12 V (two outputs) | 2.5 V to 12 V | 2.5 V to 12 V |
| Isolation Rating | 725 VDC | 725 VDC | 725 VDC | 725 VDC | 725 VDC |
| Output Ripple / Noise Feature | Standard flyback ripple | LDO post-regulated (lowest ripple) | Standard flyback ripple (x2 outputs) | Standard flyback ripple | Standard flyback ripple |
主な差別化要因
- Fully integrated transformer eliminates magnetics design risk （vs Discrete flyback controller designs)
- Standard flyback ripple at higher efficiency than post-regulated variant （vs LTM8048)
- Three functionality modes in one footprint （vs LTM8049)
設計ノート
Estimated: as a fully integrated module, LTM8047 dissipation equals input power minus output power and depends on VIN, VOUT, load, and switching frequency. Example at VIN=24V, VOUT=5V, 200mA: Pout=1.0W; at roughly 80% efficiency, dissipation is about 0.25W. Ensure the PCB ground pads connect to a solid copper plane per the datasheet layout section - the module relies on board copper as its heatsink, and available output current derates with rising internal temperature (up to 125C internal limit per datasheet).
Keep the primary-side and secondary-side grounds physically separated on the PCB, joining them only through the module's internal isolation barrier - copper routing under or around the package can bridge the 725VDC isolation gap unintentionally. Place input and output ceramic capacitors close to their respective VIN/GND and secondary pins. Follow the datasheet recommended layout diagrams; the isolation rating is only preserved if creepage/clearance on the board matches the module's internal design.
Set the output with a precision resistor network and respect the soft-start behavior: per the datasheet, the SS pin sources approximately 10uA when the part is enabled, so the soft-start capacitor value sets the output ramp. Do not exceed the 32V absolute input condition, and note the E grade is guaranteed only from 0C to 125C - selecting it for an outdoor -40C application is a common error. Verify isolation test conditions (725VDC, 1 second, each polarity) match your system's required test voltage.
コンプライアンス情報
Compliance status not stated in provided web data; verify on the Analog Devices product page or distributor compliance documents before procurement.
