AMT49413 - 3-Phase BLDC Controller and MOSFET Driver | Allegro
MPN： AMT49413 ✓ 啟用中AMT49413 概覽
A brushless DC motor controller is an integrated circuit that handles the commutation timing and current regulation for a 3-phase brushless motor. It sits hierarchically between the gate driver and the higher-level microcontroller (MCU) within the broader motor control subsystem. The AMT49413 combines the controller, current-sense amplifier, and gate driver into a single IC, reducing external component count and PCB area compared to discrete implementations.
Key features include 100% duty cycle operation for high-speed running, synchronous rectification for reduced power dissipation, and internal current sensing with an external sense resistor. The device integrates a charge pump for the high-side gate drive, eliminating the need for an external bootstrap capacitor in many topologies. Programmable features include current-limit threshold, PWM frequency, and dead time.
Typical applications include automotive cooling fans, fuel and water pumps, electric power steering systems, industrial pumps and blowers, HVAC equipment, and 48 V mild-hybrid auxiliary drives. The 50 V absolute maximum rating targets 12 V and 24 V automotive buses with transient headroom.
Design tip: External MOSFET selection must consider SOA at the commutation frequency chosen; switching losses scale with fSW. The exposed thermal pad must be soldered to a sufficient copper pour (recommended 1 square inch minimum) to keep junction temperature within ratings at high continuous current.
直接替換替代品，適用於 AMT49413 — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
此系列的變體
與下列產品可直接替換的同系列型號： AMT49413 （相同外形與佔位） — 差異在於 Package, Synchronous Rectification, Mounting Type, Motor Type, Operating Temperature.
AMT49413KEVSR-J
✅ 直接替換📋 參考替代品（不在目錄中）
A3938SLDTR-T
✅ 直接替換聯絡詢價
查看資料表 →A3977SLPTR-T
✅ 直接替換聯絡詢價
查看資料表 →AMT49413 最大額定值與電氣特性
| Motor Type | 3-phase brushless DC (BLDC) |
| Supply Voltage Range | 5.5 V to 50 V (functional); 7 V to 50 V (full gate drive) |
| Gate Drive Voltage | Greater than 10 V VGS at VBB down to 7 V |
| External FET Type | N-channel MOSFETs (3-phase bridge) |
| Control Method | Fixed-frequency PWM with Hall-sensor commutation |
| Current Sensing | Internal current-sense amplifier with external sense resistor |
| 同步整流 | Yes (programmable) |
| Charge Pump | Integrated for high-side gate drive |
| 封裝 | 48-pin QFN-EP (7 mm x 7 mm) with exposed thermal pad |
| 工作溫度範圍 | -40C to +150C (junction) |
| Commutation Method | Integrated Hall-effect sensor inputs (3 sensors) |
| PWM Frequency | Programmable (per datasheet) |
| Duty Cycle | 0% to 100% |
| Protection Features | Undervoltage lockout, thermal shutdown, short-circuit protection |
| Automotive Grade | Designed for automotive and industrial applications |
| 安裝類型 | Surface Mount (QFN-EP) |
AMT49413 48-pin qfn-ep (7 mm x 7 mm) with exposed thermal pad 腳位配置指南
AMT49413（48-pin qfn-ep (7 mm x 7 mm) with exposed thermal pad 封裝）的腳位配置。 此功率元件具有閘極、汲極與源極端子。對於非極性封裝，請參閱製造商資料表以取得確切的第 1 腳方向與佈局詳細資訊。常見應用包括電源設計、馬達驅動與負載切換。
無詳細腳位定義資料： AMT49413.
請參閱 資料表 以查看完整腳位配置。
典型應用
AMT49413 適用於 6 應用s: Automotive Cooling Fans, Automotive Fuel and Water Pumps, Industrial Pumps and Blowers, HVAC Blowers and Fans, Electric Power Steering (EPS) Auxiliary Drives, 48 V Mild-Hybrid Auxiliary Drives.
Automotive Cooling Fans
The AMT49413 is well matched to 12 V and 24 V automotive cooling fans where integrated Hall-sensor commutation simplifies the BOM. With a 5.5 V to 50 V supply range and greater than 10 V VGS gate drive down to 7 V, the controller tolerates cold-crank and load-dump transients typical of automotive electrical environments. Synchronous rectification reduces power dissipation, enabling compact QFN-EP (7x7) designs that fit inside fan hubs.
推薦
Automotive Fuel and Water Pumps
Electric fuel and water pumps in 12 V/24 V vehicles benefit from the AMT49413's integrated current sensing and programmable current limit. According to Allegro's datasheet, the device's internal current-sense amplifier with an external shunt resistor enables closed-loop torque control. The 50 V maximum rating and built-in protection features (UVLO, thermal shutdown) provide robust operation in harsh under-hood environments.
推薦
Industrial Pumps and Blowers
Industrial 24 V and 48 V pumps and blowers leverage the AMT49413's wide supply range and Hall-sensor commutation. With gate drive capable of greater than 10 V VGS at 7 V supply, the controller reliably drives N-channel MOSFETs at low bus voltages without external bootstrap components. The integrated charge pump reduces PCB area, while the programmable PWM frequency lets designers trade off switching losses against current ripple.
推薦
HVAC Blowers and Fans
Residential and commercial HVAC blowers use the AMT49413 to deliver variable-speed, high-efficiency BLDC motor control. According to the datasheet, the integrated Hall-sensor input block decodes rotor position from three digital Hall sensors, eliminating firmware overhead for commutation. Synchronous rectification improves efficiency at partial loads, reducing audible noise and extending blower life in continuous-duty HVAC applications.
推薦
Electric Power Steering (EPS) Auxiliary Drives
EPS auxiliary cooling and position-control motors require the reliability of a proven 3-phase BLDC controller like the AMT49413. The device's 50 V maximum rating tolerates 12 V load-dump transients, and integrated protections guard against short-circuit, undervoltage, and overtemperature conditions. Allegro's long history in automotive motor drivers supports the device's qualification for safety-relevant auxiliary functions in EPS systems.
推薦
48 V Mild-Hybrid Auxiliary Drives
48 V mild-hybrid systems use the AMT49413 to drive auxiliary pumps, cooling fans, and supercharger motors at higher power levels. According to Allegro's datasheet, the 50 V absolute maximum supply rating handles 48 V bus transients, while the integrated charge pump and greater than 10 V gate drive ensure robust N-channel MOSFET switching at low effective VGS. The QFN-EP package supports high continuous current with proper PCB thermal design.
推薦
推薦產品摘要
工程參考資料，適用於 AMT49413 — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 | AMT49413KEVSR-J | A3938SLDTR-T | A3977SLPTR-T |
|---|---|---|---|---|
| Brand | Allegro MicroSystems | Allegro MicroSystems | Allegro MicroSystems | Allegro MicroSystems |
| Package | 48-QFN-EP (7x7) | 48-QFN-EP (7x7) - same | 48-QFN-EP - same | 48-QFN-EP - same |
| Motor Type | 3-phase BLDC | 3-phase BLDC (half-bridge driver) | 3-phase BLDC | 3-phase BLDC |
主要差異化特點
- Integrated Hall-sensor commutation with internal current sensing (對比Discrete MCU + gate driver solution)
- Greater than 10 V VGS gate drive down to 7 V supply (對比Bootstrap-based gate drivers)
- 50 V supply rating with synchronous rectification (對比A3977SLPTR-T (older Allegro 3-phase driver))
設計說明
Estimated: at 24 V supply, 10 A continuous phase current, and 50 kHz PWM, switching losses plus conduction losses in the AMT49413 plus external MOSFETs can exceed 3 W. The 48-QFN-EP (7x7) requires at least 1 square inch of copper pour on the top layer plus thermal vias to an internal ground plane to keep junction temperature below 150 C. Derate current at elevated ambient temperatures.
Route the three half-bridge outputs (phase A, B, C) directly to the external MOSFET bridge with minimal loop area to reduce radiated EMI and dv/dt-induced ringing. According to Allegro's datasheet recommendations, place the external current-sense resistor as close to the low-side source return as possible and use a Kelvin connection to the AMT49413's current-sense inputs to avoid ground-loop errors.
Do not exceed 50 V on the supply pin, including load-dump transients. According to Allegro's datasheet, the device maintains full gate drive (>10 V VGS) only down to 7 V supply; below 5.5 V the controller ceases operation. Add a TVS diode on VBB for automotive 12 V systems. Hall-sensor inputs are ESD-sensitive - add external clamping if the harness is exposed to transients.
Select external N-channel MOSFETs with VDS rating of at least 60 V for 24 V automotive applications (1.5x derating) and gate threshold voltage compatible with the AMT49413's greater than 10 V gate drive. Rds(on) at 10 V VGS should be chosen to limit conduction losses; for 10 A continuous phase current, Rds(on) below 10 milliohm is typical.
合規資訊
RoHS and lead-free compliance per Allegro product page. AEC-Q100 qualification status should be confirmed directly with Allegro MicroSystems; the AMT49413 is described as designed for automotive applications but the specific AEC-Q100 grade is not stated in the verified web data.
