A4402ELPTR-T - Dual Buck + LDO PMIC, 2MHz, 16-TSSOP-EP | Allegro
部品番号: A4402ELPTR-T ✓ 生産中| 数量 | 単価 | 小計 |
|---|---|---|
| 1 | $0.95 | $0.95 |
| 10 | $0.89 | $8.90 |
| 100 | $0.84 | $84.00 |
| 500 | $0.79 | $395.00 |
| 1,000 | $0.75 | $750.00 |
| 4,000 | $0.71 | $2,840.00 |
A4402ELPTR-T 概要
What is a PMIC with integrated buck and LDO? A PMIC (Power Management Integrated Circuit) consolidates multiple voltage regulators into one IC; a buck (step-down switching) regulator efficiently converts a higher DC input to a lower DC output using an LC filter and PWM/COT control, while an LDO (Low-Dropout linear regulator) uses a series pass element to clean up switching ripple into a low-noise rail. Together they form a hierarchical power tree: PMIC -> multi-channel regulator -> buck + LDO co-pack -> embedded power management IC.
Key features of the A4402ELPTR-T include a wide VIN range, an integrated high-side MOSFET in the buck stage, internal frequency compensation, soft-start, and thermal shutdown. The exposed thermal pad (eTSSOP-EP) keeps junction-to-ambient thermal resistance low enough for compact PCB layouts, and the LDO post-regulation stage delivers a low-noise rail suitable for analog or RF sections fed from the buck output.
Typical applications include camera modules, sensor hubs, microcontroller core + I/O rails, point-of-sale terminals, and embedded industrial controllers. The 2 MHz switching frequency enables small external L/C footprints, while the adjustable buck output combined with the LDO allows a designer to optimize efficiency and noise trade-offs in mixed-signal systems.
Design tip: stagger the buck and LDO start-up using the part's soft-start behavior so the downstream microcontroller sees a monotonic core rail before peripheral I/O, avoiding latch-up. Use the exposed pad as the primary heat-dissipation path and place input/output capacitors as close to the IC as routing allows.
This page synthesizes distributor pricing across DigiKey, Mouser, LCSC and Octopart, lists drop-in and same-brand variants, and adds practical design notes beyond the manufacturer datasheet to help engineers pick the right Allegro A4402 part for their power tree.
ドロップイン代替品: A4402ELPTR-T — 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:
A4402KLPTR-T
✅ ドロップイン📋 参考代替品（カタログ未掲載）
A4402ELTR-T
✅ ドロップイン ⚠️ 仕様未検証📋 参考代替品（カタログ未掲載）
A4402ELPTR-T 最大定格＆電気的特性
| トポロジー | Buck + LDO (dual-output PMIC) |
| Buck Control Method | Constant On-Time (COT) |
| スイッチング周波数 | 2 MHz (max) |
| 出力数 | 2 (1 Buck + 1 LDO) |
| Buck Output Voltage | Adjustable |
| LDO Output Voltage | Adjustable |
| 動作温度範囲 | -40C to +85C |
| パッケージ | 16-pin TSSOP with exposed thermal pad (eTSSOP-EP) |
| 実装タイプ | Surface Mount |
| Packaging | Tape & Reel, 4000 pcs per 13-inch reel |
| Package Thermal Resistance (theta_JA, 4-layer PCB per JEDEC) | 34 C/W |
| Lead Finish | 100% matte tin leadframe plating (Pb-free) |
| RoHS ステータス | ROHS3 Compliant |
| 熱シャットダウン | Yes (internal) |
| ソフトスタート | Yes (internal) |
A4402ELPTR-T ピン構成
| ピン 1 | VIN — Input supply voltage for the IC |
| ピン 2 | EN — Enable / soft-start control input |
| ピン 3 | BST — Bootstrap for buck high-side gate drive |
| ピン 4 | LX — Buck switch node (to external inductor) |
| ピン 5 | FB — Buck feedback (to external resistor divider) |
| ピン 6 | GND — Ground |
| ピン 7 | AGND — Analog ground |
| ピン 8 | VOUT_LDO — LDO output voltage |
| ピン 9 | FB_LDO — LDO feedback (to external resistor divider) |
| ピン 10 | VIN_LDO — LDO input supply (typically tied to buck output) |
| ピン 11 | PGND — Power ground for buck stage |
| ピン 12 | NC — Not connected (per datasheet) |
| ピン 13 | NC — Not connected (per datasheet) |
| ピン 14 | COMP — Compensation network node |
| ピン 15 | SS — Soft-start setting |
| ピン 16 | PGOOD — Power-good indicator output |
主な用途
A4402ELPTR-T の用途: 6 件s: Camera Module Power Supply, Microcontroller Core + I/O Rail Generator, Sensor Hub Power Management, Point-of-Sale (POS) Terminal Power, Embedded Industrial Controller, Portable / Battery-Powered Device.
Camera Module Power Supply
The A4402ELPTR-T fits camera module designs because its 2 MHz buck converter generates a low-ripple core rail for the image sensor DSP while the integrated LDO cleans the supply for the analog frontend and image sensor AVDD pin. The 16-pin TSSOP-EP footprint occupies minimal PCB real estate, critical inside the tight stack-up of a camera module. Buck output adjustable down to sub-1 V combined with the LDO post-regulation keeps switching noise far below the sensor's noise floor.
おすすめ
Microcontroller Core + I/O Rail Generator
In microcontroller-based designs the A4402ELPTR-T generates both the 1.2-3.3 V MCU core rail and the 1.8-5 V I/O rail from a single battery or 5 V bus. The constant on-time buck reaches 2 MHz, which keeps the inductor under 1 uH and the output ripple low, while the LDO post-regulates the I/O rail to remove switching artifacts. Soft-start and thermal shutdown protect the MCU during inrush and fault conditions.
おすすめ
Sensor Hub Power Management
Multi-sensor hubs (IMU + pressure + temperature) need clean rails for MEMS oscillators and noisy digital logic rails separately. The A4402ELPTR-T's dual output lets the buck rail feed the digital MCU while the LDO rail feeds the analog MEMS bias network, with the LDO eliminating buck ripple that would otherwise couple into MEMS drive signals. The exposed thermal pad keeps the IC cool in continuous-operation sensor nodes.
おすすめ
Point-of-Sale (POS) Terminal Power
POS terminals combine a display controller, secure element, magstripe reader and printer, each with different voltage and current profiles. The A4402ELPTR-T supplies the buck rail for the main processor and the LDO rail for the secure element or analog audio path in a single IC, reducing BOM count and PCB area. The wide VIN range supports direct connection to 5 V or 12 V system rails commonly used in POS hardware.
おすすめ
Embedded Industrial Controller
Industrial controllers demand robust power with thermal margin. The A4402ELPTR-T's 16-pin TSSOP-EP package with 34 C/W theta-JA on a 4-layer PCB allows sustained operation near the upper end of its -40C to +85C range, and the integrated thermal shutdown adds a fault-recovery layer. The dual adjustable outputs support a wide range of processor families and their companion analog ICs.
おすすめ
Portable / Battery-Powered Device
Battery-powered devices benefit from the A4402ELPTR-T's buck efficiency at light loads and the LDO's low quiescent current for sleep-mode rails. Constant on-time control gives excellent light-load efficiency compared to fixed-frequency PWM at the cost of slightly variable frequency. The compact 16-pin TSSOP-EP footprint leaves more room for the battery, and RoHS3 compliance keeps the device compatible with global lead-free regulations.
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: A4402ELPTR-T — 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 | A4402KLPTR-T | A4402ELTR-T |
|---|---|---|---|
| Brand | Allegro MicroSystems | Allegro MicroSystems | Allegro MicroSystems |
| Package | 16-pin TSSOP-EP (eTSSOP-EP) | 16-pin TSSOP-EP (eTSSOP-EP) - same | 16-pin TSSOP-EP (eTSSOP-EP) - same |
| Operating Temperature Range | -40C to +85C | -40C to +150C | -40C to +85C |
| Topology | Buck + LDO (dual-output PMIC) | Buck + LDO (dual-output PMIC) - same | Buck + LDO (dual-output PMIC) - same |
| Switching Frequency | 2 MHz | 2 MHz | 2 MHz |
| Output Voltages | Adjustable (Buck) + Adjustable (LDO) | Adjustable (Buck) + Adjustable (LDO) | Adjustable (Buck) + Adjustable (LDO) |
| RoHS Status | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant |
| Thermal Shutdown | Yes | Yes | Yes |
主な差別化要因
- Single-IC dual-output (buck + LDO) reduces BOM and sequencing logic （vs Discrete buck IC + external LDO design)
- 2 MHz constant on-time buck enables compact LC filter （vs Standard 500 kHz - 1 MHz buck converters)
- RoHS3 compliant with Pb-free matte-tin leadframe （vs Older SnPb leadframe variants)
設計ノート
Estimated: the A4402ELPTR-T has a package thermal resistance of 34 C/W on a 4-layer JEDEC PCB. At 1 W dissipation the junction rises 34 C above ambient; budget design margin so worst-case ambient (e.g. 70 C) + junction rise stays below the 125 C shutdown threshold. The exposed thermal pad must be soldered to a continuous copper pour of at least 100 mm^2 on the top layer, with thermal vias to inner ground planes.
Place the buck input capacitor, output capacitor and inductor within 2-3 mm of the LX pin and PGND to minimize high-di/dt loop area. Keep the feedback traces away from the LX switching node to prevent noise coupling into the buck control loop. Use a star-ground connection tying AGND and PGND together at the IC's ground pin, not at the load.
Do not operate the A4402ELPTR-T above its 85C ambient rating for sustained loads - if your enclosure runs hot, choose the A4402KLPTR-T (-40C to +150C) instead. Always populate the soft-start capacitor and the LDO feedback divider with 1% tolerance parts to maintain output accuracy. Avoid reverse-polarity input transients; add an external TVS if the input bus is hot-pluggable.
コンプライアンス情報
ROHS3 compliant per distributor listing (IC-1101, DigiKey) and Allegro datasheet - 100% matte tin leadframe, Pb-free. Not AEC-Q100 qualified; for automotive designs, contact Allegro for qualified alternatives. REACH compliance assumed for Allegro parts but not explicitly stated in verified data - flagged as 'unknown' per data authenticity rules.
