LTC2928CUHF#PBF - 4-Channel Power Sequencer & Supervisor | ADI
部品番号: LTC2928CUHF#PBF ✓ 生産中| 数量 | 単価 | 小計 |
|---|---|---|
| 1 | $5.43 | $5.43 |
| 10 | $4.89 | $48.90 |
| 100 | $4.35 | $435.00 |
| 500 | $3.91 | $1,955.00 |
| 1,000 | $3.48 | $3,480.00 |
LTC2928CUHF#PBF 概要
A power supply sequencer is a specialized power management IC that controls the order and timing of multiple voltage rails during system startup and shutdown. It is a critical component in systems with multiple supply voltages, such as FPGAs, ASICs, processors, and mixed-signal boards, where improper sequencing can lead to functional failures or permanent damage. The LTC2928 integrates sequencing and supervision into a single device, reducing board space and component count compared to discrete solutions.
Key features of the LTC2928 include the ability to sequence up to four supplies per device, with cascading capability to handle an unlimited number of supplies by connecting multiple LTC2928s together. Sequencing thresholds, order, and timing are configured with just a few external resistors and capacitors, eliminating the need for software or PC board layout changes during development. The device also provides high-accuracy supervision with over-voltage and fault indication, selectable system shutdown, and fault event reporting with diagnostics.
Technically, the LTC2928 uses a resistor-programmable architecture to set the sequencing order and timing, with an internal precision reference for accurate threshold detection. It supports both positive and negative supply monitoring, and its cascading interface allows seamless expansion. The device operates from a single supply voltage, typically 3.3V or 5V, and includes an open-drain fault output for system-level monitoring.
Typical applications include FPGA and ASIC power sequencing, server and storage systems, telecom and networking equipment, and industrial control systems. The LTC2928 is particularly suited for designs where multiple voltage rails must be sequenced reliably without software intervention, and where high accuracy supervision is required to protect downstream components.
When designing with the LTC2928, it is important to properly set the sequencing thresholds and timing using external resistors and capacitors, and to ensure adequate decoupling on the supply pins. The device's cascading feature should be used for systems with more than four rails, and the fault output should be connected to a system controller for proper fault handling.
ドロップイン代替品: LTC2928CUHF#PBF — 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:
LTC2928IUHF#PBF
✅ ドロップイン📋 参考代替品（カタログ未掲載）
LTC2928CUHF#TRPBF
✅ ドロップイン📋 参考代替品（カタログ未掲載）
LTC2928CUHF#PBF
✅ ドロップイン✓ 在庫あり
$3.48 / 個
データシートを見る →LTC4234IWHH#PBF
⚡ 同一パッケージ📋 参考代替品（カタログ未掲載）
LTC2928CUHF#PBF 仕様
| Number of Channels | 4 |
| Type | Power Supply Sequencer and Supervisor |
| パッケージ | 38-QFN (5x7 mm) |
| 動作温度範囲 | 0°C to 70°C (Commercial) |
| Cascadable | Yes |
| Sequencing Thresholds | Resistor-Programmable |
| Timing Configuration | External Components |
| Fault Output | Open-Drain |
| Over-Voltage Indication | Yes |
| Fault Event Reporting | Yes |
| Selectable System Shutdown | Yes |
| RoHS ステータス | Compliant |
| 実装タイプ | Surface Mount |
LTC2928CUHF#PBF ピン構成
| ピン 1 | VCC — Positive supply voltage |
| ピン 2 | GND — Ground |
| ピン 3 | SEQ1 — Sequencing output for supply 1 |
| ピン 4 | SEQ2 — Sequencing output for supply 2 |
| ピン 5 | SEQ3 — Sequencing output for supply 3 |
| ピン 6 | SEQ4 — Sequencing output for supply 4 |
| ピン 7 | FAULT — Open-drain fault output |
| ピン 8 | OV — Over-voltage indication output |
| ピン 9 | SHDN — Shutdown input |
| ピン 10 | CASC — Cascade input/output for multiple devices |
| ピン 11 | REF — Reference voltage output |
| ピン 12 | GND — Ground |
主な用途
LTC2928CUHF#PBF の用途: 6 件s: FPGA Power Sequencing, Server and Storage Systems, Telecom and Networking Equipment, Industrial Control Systems, Medical Equipment, Test and Measurement Equipment.
FPGA Power Sequencing
The LTC2928CUHF#PBF sequences multiple FPGA supply rails (VCCINT, VCCAUX, VCCO) in the correct order to prevent latch-up and damage. Its resistor-programmable thresholds and timing allow easy configuration without software. With 4 channels per device and cascading capability, it can handle the multiple rails required by modern FPGAs, ensuring reliable power-up and power-down sequences. The high-accuracy supervision provides over-voltage and fault indication, protecting the FPGA from abnormal supply conditions.
おすすめ
Server and Storage Systems
In servers and storage systems, multiple voltage rails (e.g., 12V, 5V, 3.3V, 1.8V) must be sequenced to ensure proper operation of CPUs, memory, and peripherals. The LTC2928CUHF#PBF provides a compact, configurable solution that sequences up to four supplies per device, with cascading for additional rails. Its fault reporting and selectable shutdown enhance system reliability, making it ideal for high-availability data center equipment.
おすすめ
Telecom and Networking Equipment
Telecom and networking equipment often have multiple supply rails that must be sequenced to avoid damage to line cards, switches, and routers. The LTC2928CUHF#PBF's resistor-programmable sequencing simplifies design changes without software updates, and its cascading feature supports systems with many rails. The device's high-accuracy supervision and fault indication help maintain uptime in critical communication infrastructure.
おすすめ
Industrial Control Systems
Industrial control systems require reliable power sequencing for PLCs, motor drives, and sensors. The LTC2928CUHF#PBF operates over 0°C to 70°C, suitable for many industrial environments, and its cascading capability allows expansion for complex systems. The device's fault reporting and selectable shutdown provide robust protection, ensuring safe operation in harsh conditions.
おすすめ
Medical Equipment
Medical devices often have stringent power sequencing requirements to ensure patient safety and reliable operation. The LTC2928CUHF#PBF provides precise sequencing and supervision, with configurable thresholds and timing to meet specific design needs. Its small 38-QFN package is suitable for space-constrained medical devices, and its fault indication helps in diagnostics and maintenance.
おすすめ
Test and Measurement Equipment
Test and measurement instruments require clean, sequenced power supplies to ensure accurate measurements. The LTC2928CUHF#PBF's low-noise operation and precise sequencing help maintain signal integrity. Its cascading capability allows it to manage multiple rails in complex instruments, and its fault reporting aids in troubleshooting, making it a reliable choice for benchtop and automated test equipment.
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: LTC2928CUHF#PBF — 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 | LTC2928IUHF#PBF | LTC2928CUHF#TRPBF | ADM1186-1ARMZ-R7 |
|---|---|---|---|---|
| Package | 38-QFN (5x7 mm) | 38-QFN (5x7 mm) | 38-QFN (5x7 mm) | 10-MSOP |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Number of Channels | 4 | 4 | 4 | 4 |
| Temperature Grade | Commercial (0°C to 70°C) | Industrial (-40°C to 85°C) | Commercial (0°C to 70°C) | Industrial (-40°C to 85°C) |
| Cascadable | Yes | Yes | Yes | Yes |
| Fault Output | Open-Drain | Open-Drain | Open-Drain | Open-Drain |
| RoHS Compliant | Yes | Yes | Yes | Yes |
| Pin Compatibility | Reference | Pin-compatible | Pin-compatible | Not pin-compatible |
主な差別化要因
- Cascadable to unlimited supplies （vs ADM1186-1ARMZ-R7)
- Resistor-programmable configuration （vs LTC4234IWHH#PBF)
- High-accuracy supervision with fault reporting （vs ADM1186-1ARMZ-R7)
設計ノート
For optimal performance, place the LTC2928CUHF#PBF close to the power supplies it is sequencing. Use a solid ground plane and keep traces short and wide to minimize inductance. Place decoupling capacitors (0.1uF and 10uF) close to the VCC pin. Ensure the exposed pad is soldered to the ground plane for thermal and electrical connectivity.
The LTC2928CUHF#PBF requires a clean supply voltage for accurate threshold detection. Use a low-noise LDO or a well-filtered switching regulator to power the VCC pin. Avoid sharing the VCC pin with high-current loads that can cause voltage dips. According to the datasheet, the supply voltage range is [DATA_NEEDED: Supply Voltage Range], so verify the input voltage is within spec.
A common mistake is incorrect configuration of sequencing thresholds and timing resistors. Use precision resistors (1% or better) to set thresholds accurately. Also, ensure the cascading pins are properly connected when using multiple LTC2928s. Refer to the datasheet's typical application circuits for correct resistor values and connections.
コンプライアンス情報
RoHS compliant per Analog Devices product page. Not AEC-Q100 qualified. Lead-free per datasheet.
