LT1076CQ - 2A Step-Down Switching Regulator | Analog Devices
部品番号: LT1076CQ ✓ 生産中| 数量 | 単価 | 小計 |
|---|---|---|
| 1 | $5.23 | $5.23 |
| 10 | $4.85 | $48.50 |
| 100 | $4.2 | $420.00 |
| 500 | $3.8 | $1,900.00 |
| 1,000 | $3.5 | $3,500.00 |
LT1076CQ 概要
A switching regulator is a voltage regulator that uses a switching element (transistor) to convert an input voltage to a desired output voltage with high efficiency, typically above 80%. Unlike linear regulators, switching regulators store energy in inductors and capacitors and switch the element on and off at a high frequency (100kHz for the LT1076) to control the output. This makes them ideal for applications where power dissipation and heat are concerns, such as battery-powered devices and industrial power supplies.
Key features of the LT1076CQ include a 100kHz switching frequency, 8.5mA quiescent current, programmable current limit, and the ability to operate with input voltages up to 60V. The device also includes micropower shutdown for power saving. The TO-263-6 package provides excellent thermal performance with a low thermal resistance, enabling high power dissipation without external heatsinks in many applications.
The LT1076CQ uses a classic positive buck topology but includes design innovations that allow it to be used as a positive-to-negative converter (flyback) and in boost configurations. The internal current limit is set at 2.6A (for the LT1076), and the oscillator frequency is preset at 100kHz, which balances efficiency and component size. The device is designed for rugged industrial environments, with a junction temperature range of -40°C to +125°C.
Typical applications include industrial power supplies, battery chargers, distributed power systems, and automotive electronics. Its wide input voltage range and high efficiency make it suitable for systems that require step-down conversion from 24V or 48V buses. The LT1076CQ is also used in negative output applications, such as generating -5V from a positive input.
When designing with the LT1076CQ, ensure proper input and output capacitor selection and inductor sizing to maintain stability and low ripple. The programmable current limit allows designers to set the maximum switch current to protect the circuit. The device is available in lead-free (PBF) and tape-and-reel (TR) options, and is RoHS compliant.
ドロップイン代替品: LT1076CQ — 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。
このシリーズのバリエーション
同一シリーズでドロップイン互換のモデル: LT1076CQ （同一形状・フットプリント） — 相違点: Function, Package, RoHS Status.
クイック比較ツール — 並列比較する代替部品を選択:
LT1076CQ#PBF
✅ ドロップイン✓ 在庫あり
$4.45 / 個
データシートを見る →LT1076CQ#TR
✅ ドロップイン📋 参考代替品（カタログ未掲載）
LT1076CQ-5
✅ ドロップイン📋 参考代替品（カタログ未掲載）
LT1074CQ
✅ ドロップイン ⚠️ 仕様未検証📋 参考代替品（カタログ未掲載）
LT1076CQ 最大定格＆電気的特性
| 機能 | Step-Down (Buck), Boost, Flyback |
| 出力タイプ | Adjustable |
| 出力電圧 - 最小 | 2.5 V |
| Output Current (Switch) | 2 A |
| Input Voltage (Max) | 60 V |
| スイッチング周波数 | 100 kHz |
| 静止電流 | 8.5 mA |
| 電流制限 | 2.6 A (programmable) |
| パッケージ | TO-263-6 (D2PAK) |
| 実装タイプ | Surface Mount |
| 動作温度 | -40°C to +125°C |
| 出力数 | 1 |
| 同期整流器 | No |
| RoHS ステータス | Compliant (PBF option) |
| Lead-Free | Yes (PBF option) |
LT1076CQ ピン構成
| ピン 1 | VSW — Switch output |
| ピン 2 | VIN — Input supply |
| ピン 3 | GND — Ground |
| ピン 4 | FB — Feedback |
| ピン 5 | ILIM — Current limit adjust |
| ピン 6 | SHDN — Shutdown |
| ピン 7 | TAB — Thermal pad (GND) |
主な用途
LT1076CQ の用途: 6 件s: Industrial Power Supplies, Battery Chargers, Distributed Power Systems, Automotive Electronics, Telecom and Networking Equipment, Negative Voltage Generators.
Industrial Power Supplies
The LT1076CQ is ideal for industrial power supplies that require step-down conversion from 24V or 48V buses. Its 60V input rating and 2A switch current handle moderate loads efficiently. The 100kHz switching frequency allows for small external components, reducing board space. The device's rugged design and wide temperature range ensure reliable operation in harsh industrial environments. When used in a buck converter, it can achieve efficiencies above 80%, minimizing heat dissipation. The programmable current limit provides protection against overloads, making it suitable for powering sensors, actuators, and control circuits.
おすすめ
Battery Chargers
The LT1076CQ can be configured as a constant-current/constant-voltage battery charger for lead-acid or lithium-ion batteries. Its adjustable output and current limit allow precise control of charging voltage and current. The high efficiency reduces heat generation, which is critical in enclosed charger designs. The device's ability to operate from a wide input range (up to 60V) makes it suitable for charging from solar panels or automotive alternators. The shutdown feature enables low-power standby when the battery is fully charged. With proper external components, the LT1076CQ provides a reliable and cost-effective charging solution.
おすすめ
Distributed Power Systems
In distributed power architectures, the LT1076CQ is used to generate local rails from a central bus. Its 60V input capability allows it to step down from 48V telecom or industrial buses to 5V or 3.3V logic rails. The 2A output current is sufficient for powering microcontrollers, sensors, and communication interfaces. The device's high efficiency reduces the need for heatsinking, simplifying PCB layout. The adjustable output voltage provides flexibility for various rail voltages. The LT1076CQ's robust design ensures stable operation in noisy environments, making it a reliable choice for distributed power systems.
おすすめ
Automotive Electronics
The LT1076CQ is suitable for automotive electronics that require step-down conversion from the 12V or 24V battery. Its input voltage rating of 60V handles load dump transients, and the -40°C to +125°C temperature range covers under-hood environments. The device can power infotainment systems, sensors, and lighting controllers. The 100kHz switching frequency minimizes interference with AM radio bands. The programmable current limit protects against short circuits. While not AEC-Q100 qualified, the LT1076CQ is widely used in automotive designs where the qualification is not mandatory. Its high efficiency reduces battery drain, extending vehicle battery life.
おすすめ
Telecom and Networking Equipment
The LT1076CQ is used in telecom and networking equipment to generate low-voltage rails from 48V backplanes. Its 60V input rating is ideal for -48V telecom supplies, and the 2A output can power line cards, switches, and routers. The device's high efficiency reduces heat in densely packed equipment racks. The adjustable output allows for various logic voltages. The shutdown feature enables power saving during idle periods. The LT1076CQ's reliability and long-term availability make it a trusted choice for infrastructure equipment that requires high uptime.
おすすめ
Negative Voltage Generators
The LT1076CQ can be configured as a positive-to-negative converter to generate negative supply rails, such as -5V or -12V, from a positive input. This is useful in applications like op-amp supplies, LCD bias, and audio circuits. The flyback topology allows for isolation if a transformer is used. The device's 2A switch current provides sufficient power for most negative rail applications. The adjustable output voltage enables precise negative voltage setting. The LT1076CQ's high efficiency and small footprint make it an attractive solution for generating negative rails without a separate transformer.
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: LT1076CQ — 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 | LT1076CQ#PBF | LT1076CQ#TR | LT1076CQ-5 | LT1074CQ |
|---|---|---|---|---|---|
| Package | TO-263-6 (D2PAK) | TO-263-6 (D2PAK) | TO-263-6 (D2PAK) | TO-263-6 (D2PAK) | TO-263-6 (D2PAK) |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Output Current (Switch) | 2 A | 2 A | 2 A | 2 A | 5 A |
| Input Voltage (Max) | 60 V | 60 V | 60 V | 60 V | 60 V |
| Switching Frequency | 100 kHz | 100 kHz | 100 kHz | 100 kHz | 100 kHz |
| Output Voltage | Adjustable (2.5V min) | Adjustable (2.5V min) | Adjustable (2.5V min) | Fixed 5V | Adjustable (2.5V min) |
| Quiescent Current | 8.5 mA | 8.5 mA | 8.5 mA | 8.5 mA | 8.5 mA |
| Lead-Free | No (standard) | Yes | No | No | No |
主な差別化要因
- Wide input voltage range up to 60V （vs MC34167)
- Programmable current limit （vs LT1074CQ)
- Low quiescent current of 8.5mA （vs MC34167)
設計ノート
For the LT1076CQ, ensure the input and output capacitors are placed close to the IC pins to minimize parasitic inductance. Use a low-ESR electrolytic capacitor (e.g., 100uF) on the input and a 100uF output capacitor. A 0.1uF ceramic capacitor should be placed near the VIN pin for high-frequency decoupling. The thermal pad (TAB) should be soldered to a large copper area for heat dissipation.
The LT1076CQ in TO-263-6 package can dissipate significant power at high input-output differentials. For example, at VIN=24V, VOUT=5V, and 2A load, the power dissipation is approximately 38W (assuming 80% efficiency). This requires a heatsink or a large copper area on the PCB. The thermal resistance from junction to ambient (theta_JA) is typically 40°C/W with proper copper area. Ensure the junction temperature stays below 125°C.
Do not exceed the maximum input voltage of 60V. The current limit is programmable via the ILIM pin; leaving it open sets the default limit to 2.6A. Use a resistor to ground to reduce the limit. The SHDN pin can be used for micropower shutdown; connect to ground for shutdown, and to VIN for normal operation. Ensure the feedback resistor divider uses 1% tolerance resistors for accurate output voltage.
コンプライアンス情報
The LT1076CQ standard version is not lead-free; the LT1076CQ#PBF is lead-free and RoHS compliant. AEC-Q100 qualification is not specified.
