AOZ1282CI - 1.2A, 36V Buck Regulator, 450kHz, SOT-23-6 | AOS
部品番号: AOZ1282CI ✓ 生産中| 数量 | 単価 | 小計 |
|---|---|---|
| 1 | $1 | $1.00 |
| 10 | $0.9 | $9.00 |
| 100 | $0.75 | $75.00 |
| 500 | $0.65 | $325.00 |
| 1,000 | $0.55 | $550.00 |
AOZ1282CI 概要
A buck regulator (also called a step-down DC-DC switching regulator) is a power management integrated circuit that converts a higher DC input voltage into a lower DC output voltage at high efficiency by rapidly switching an internal MOSFET and storing energy in an external inductor. Within the broader power management taxonomy, the AOZ1282CI sits at the regulator level: buck regulator -> DC-DC converter -> switching regulator -> power management IC -> semiconductor. The high-side internal N-MOSFET architecture and current-mode control topology place this part in the EZBuck family, designed for compact point-of-load applications.
Key specifications include a 0.8V to 36V adjustable output range via an external resistor divider at the FB pin, internal soft-start, cycle-by-cycle current limit, and over-temperature protection. The fixed 450 kHz switching frequency enables a small inductor footprint, while the wide VIN range supports both 5V, 12V, and 24V industrial bus systems with sufficient headroom. Efficiency reaches up to 95% under typical load conditions.
Typical applications include 12V and 24V distributed power systems, point-of-load conversion for FPGAs, MCUs and DSPs, automotive infotainment and body electronics, industrial control boards, and battery-powered portable equipment where compact size and high efficiency are required.
When designing with the AOZ1282CI, place the input ceramic bypass capacitor as close as possible to the VIN and PGND pins to minimize switching noise injection, and select an inductor with low DCR to preserve efficiency at the 1.2A load.
This page synthesizes distributor pricing, drop-in same-package alternatives, and practical design notes not consolidated on any single distributor or manufacturer page.
ドロップイン代替品: AOZ1282CI — 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: AOZ1282CI （同一形状・フットプリント） — 相違点: Continuous Output Current, Control Mode, Input Voltage Range, Operating Temperature Range, Output Voltage Range.
クイック比較ツール — 並列比較する代替部品を選択:
AOZ1282CI-1
✅ ドロップイン📋 参考代替品（カタログ未掲載）
AOZ1282CI-2
✅ ドロップイン📋 参考代替品（カタログ未掲載）
AOZ1282CI#A
✅ ドロップイン📋 参考代替品（カタログ未掲載）
AOZ1282CI 最大定格＆電気的特性
| トポロジー | Buck (Step-Down) |
| 入力電圧範囲 | 4.5 V to 36 V |
| 出力電圧範囲 | 0.8 V to 36 V (adjustable) |
| Continuous Output Current | 1.2 A |
| スイッチング周波数 | 450 kHz (fixed) |
| Control Mode | Current-mode PWM |
| 効率 | Up to 95% |
| High-Side Switch | Internal N-MOSFET |
| Feedback Reference Voltage | 0.8 V (typical) |
| 動作温度範囲 | -40 °C to +85 °C |
| パッケージ | SOT-23-6 |
| 実装タイプ | Surface Mount |
| RoHS ステータス | Compliant |
| Protection Features | Cycle-by-cycle current limit, over-temperature protection, internal soft-start |
AOZ1282CI ピン構成
| ピン 1 | EN — Enable input (active high) |
| ピン 2 | GND — Power ground |
| ピン 3 | FB — Feedback voltage input (to external resistor divider) |
| ピン 4 | LX — Switch node to external inductor |
| ピン 5 | VIN — Input supply voltage |
| ピン 6 | BST — Bootstrap capacitor connection for high-side gate drive |
主な用途
AOZ1282CI の用途: 6 件s: 12V/24V Industrial Point-of-Load Conversion, Automotive Body Electronics and Infotainment, FPGA and DSP Auxiliary Rail Supply, Portable and Battery-Powered Equipment, Distributed Power Architecture (DPA) Bricks, LED Lighting and Backlight Driver Supply.
12V/24V Industrial Point-of-Load Conversion
The AOZ1282CI's 4.5V to 36V input range and 1.2A continuous output current make it an ideal point-of-load regulator for industrial 12V and 24V bus systems. With 95% peak efficiency, the part delivers the 3.3V or 5V rails required by industrial MCUs, sensors, and signal-conditioning ICs while minimizing heat rise in sealed enclosures. The fixed 450 kHz PWM frequency keeps fundamental switching ripple above the AM band and enables a compact LC filter footprint on the PCB, which is critical when the downstream logic sits within a few centimeters of the regulator.
おすすめ
Automotive Body Electronics and Infotainment
The AOZ1282CI's wide 4.5V to 36V input directly accepts automotive 12V battery voltage, including load-dump transients within the regulation envelope. Designers use it to generate 5V or 3.3V rails for body-control modules, infotainment head units, and instrument-cluster MCUs, replacing larger TO-220 linear regulators with a compact SOT-23-6 footprint. The internal cycle-by-cycle current limit and over-temperature protection provide the robustness expected in automotive environments, while the high efficiency reduces cold-crank battery drain. For AEC-Q100-qualified builds, designers should verify the specific lot qualification status with AOS.
おすすめ
FPGA and DSP Auxiliary Rail Supply
FPGAs, DSPs, and high-performance MCUs often require multiple low-voltage rails at moderate currents for auxiliary logic, memory, and I/O banks. The AOZ1282CI delivers up to 1.2A at output voltages down to 0.8V, suitable for generating 1.0V, 1.2V, 1.5V, 1.8V, 2.5V, 3.3V, or 5V rails from a 5V or 12V input bus. Its high efficiency minimizes thermal stress on the PCB, and the small SOT-23-6 footprint allows placement close to the load pin, reducing parasitic inductance and improving transient response when the FPGA switches heavy logic blocks.
おすすめ
Portable and Battery-Powered Equipment
Battery-powered portable devices benefit from the AOZ1282CI's high efficiency and wide input range, which allows direct operation from a 1S to 6S lithium pack or a 12V adapter. The part's low quiescent current and internal soft-start extend battery life, while the SOT-23-6 footprint occupies only a few square millimeters on densely populated portable PCBs. Typical uses include handheld test instruments, portable medical monitoring devices, and consumer electronics where every milliwatt of regulator loss matters for runtime.
おすすめ
Distributed Power Architecture (DPA) Bricks
In distributed power architectures, an isolated front-end converter provides a 12V or 24V intermediate bus, and the AOZ1282CI serves as a non-isolated point-of-load step-down to deliver the final 0.8V to 5V logic rail. The part's 36V input tolerance handles transient excursions on the intermediate bus without damage, and the adjustable output via a single resistor divider simplifies stocking a single BOM item across multiple rail voltages. This reduces the SKU count for contract manufacturers and accelerates time to market.
おすすめ
LED Lighting and Backlight Driver Supply
Constant-current LED drivers require a stable DC supply rail for their internal regulation loops. The AOZ1282CI's wide VIN range lets it generate 5V to 24V driver rails from 24V or 36V LED lighting bus inputs, with high efficiency that keeps the driver electronics cool inside enclosed luminaires. The fixed 450 kHz switching frequency allows the use of small ceramic output capacitors, reducing BOM cost and assembly height in space-constrained LED fixtures.
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: AOZ1282CI — 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 | AOZ1282CI-1 | AOZ1282CI-2 | AOZ1282CI#A |
|---|---|---|---|---|
| Brand | Alpha & Omega Semiconductor | Alpha & Omega Semiconductor | Alpha & Omega Semiconductor | Alpha & Omega Semiconductor |
| Package | SOT-23-6 | SOT-23-6 (same) | SOT-23-6 (same) | SOT-23-6 (same) |
| Output Current | 1.2 A | 0.6 A (-50%) | 0.6 A (-50%) | 1.2 A (same) |
| Input Voltage Range | 4.5 V to 36 V | 4.5 V to 36 V | 4.5 V to 36 V | 4.5 V to 36 V |
| Switching Frequency | 450 kHz | 450 kHz | 1 MHz | 450 kHz |
| Output Voltage Range | 0.8 V to 36 V | 0.8 V to 36 V | 0.8 V to 36 V | 0.8 V to 36 V |
| Pin Compatibility | SOT-23-6 reference | Pin-compatible (SOT-23-6) | Pin-compatible (SOT-23-6) | Identical pinout (SOT-23-6) |
| Internal MOSFET | Yes (high-side N-MOS) | Yes (high-side N-MOS) | Yes (high-side N-MOS) | Yes (high-side N-MOS) |
主な差別化要因
- Full 1.2A output current in SOT-23-6 （vs AOZ1282CI-1 / AOZ1282CI-2)
- Wide 4.5V to 36V input tolerance （vs AOZ1282CI#A)
- Fixed 450 kHz switching frequency for low EMI （vs AOZ1282CI-2)
設計ノート
Place the input ceramic bypass capacitor (typically 10 µF X7R) as close as possible to the VIN and PGND pins to minimize switching noise injection into the input bus. The LX trace should be kept short and surrounded by GND copper on the same layer to reduce radiated EMI, and the FB trace must be routed away from the LX node to avoid noise coupling into the feedback divider.
Estimated: at VIN = 24 V, VOUT = 5 V, and IOUT = 1.2 A, conduction losses in the internal high-side MOSFET plus switching losses yield roughly 0.6-0.9 W dissipation in the SOT-23-6 package. With a typical SOT-23-6 θJA around 150-180 °C/W on a 1 oz 2-layer board, the junction temperature rise above ambient is approximately 90-160 °C - a thermal copper pour under the package and adequate airflow are recommended for sustained full-load operation above 70 °C ambient.
Do not omit the bootstrap capacitor between BST and LX; without it the high-side gate drive collapses and the regulator fails to start. Always populate the FB resistor divider with 1% tolerance parts to maintain VOUT accuracy, and respect the minimum 4.5V input requirement - operation below this may cause irregular switching and poor regulation. Avoid routing sensitive analog signals directly under the LX trace to prevent switching noise injection.
コンプライアンス情報
RoHS compliance per AOS product page and distributor listings. Not specifically AEC-Q100 qualified - verify with manufacturer for automotive production builds. Halogen-free and conflict-minerals status not explicitly published in the verified data.
