AMT49100 - 80V Automotive 3-Phase MOSFET Gate Driver | Allegro
MPN: AMT49100 ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $6.85 | $6.85 |
| 10 | $6.21 | $62.10 |
| 100 | $5.52 | $552.00 |
| 500 | $4.97 | $2,485.00 |
| 1,000 | $4.43 | $4,430.00 |
AMT49100 Overview
A three-phase gate driver for BLDC motors sits in the motor-driver hierarchy as a sub-category of power MOSFET gate drivers, which in turn belong to power management ICs and motor-driver ICs. These ICs sit between a low-voltage logic/microcontroller domain and a high-current 48 V or 80 V power domain, providing the level shifting, dead-time insertion, and shoot-through protection that discrete H-bridge circuits cannot reliably deliver. Without an integrated gate driver, designers would need bootstrap circuits, charge pumps, and discrete level shifters to switch the high-side N-MOSFETs in a three-phase bridge.
Key features of the AMT49100 include an operating voltage range up to 80 V (suitable for 48 V automotive battery systems with transient headroom), integrated charge pump for 100% duty-cycle high-side drive, programmable gate-drive current, comprehensive diagnostics via SPI (open-load, short-to-ground, short-to-battery, over-temperature, VDS monitoring), and ASIL-oriented safety features. The exposed thermal pad and 7x7 mm outline reduce PCB footprint while supporting the thermal demands of continuous high-current motor commutation.
The AMT49100 uses a sophisticated SPI-programmable architecture that lets the host MCU configure dead time, gate current, fault thresholds, and diagnostic modes. Integrated VDS sensing protects the external MOSFETs from short-circuit events, while a window watchdog and BIST features support ASIL-B/System-Level functional safety. The device operates across the full automotive temperature range and includes reverse-battery and load-dump protection typical of 48 V systems.
Typical applications include 48 V electric power steering (EPS) systems, 48 V mild-hybrid e-compressors, electric superchargers, and 48 V coolant/heating pumps. The 80 V rating also accommodates 24 V commercial-vehicle applications. The combination of integrated safety features and small footprint makes the AMT49100 well suited for safety-critical automotive motor control.
When designing with this device, pay particular attention to the gate-drive current programming, dead-time selection, and PCB layout of the high-current motor phases. Keep the phase traces short and use a low-impedance ground return to minimize ringing on the gate-drive signals, and follow Allegro's reference layout for the bootstrap capacitors.
This page synthesizes Allegro datasheet parameters, distributor pricing and stock from DigiKey/Mouser, cross-reference alternatives for drop-in replacement, and practical design notes not found in the manufacturer datasheet alone.
Drop-in alternatives for AMT49100 — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with AMT49100 (same form factor and footprint) — differing in Package, Motor Type, Operating Temperature Range, RoHS Status.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
AMT49101
✅ Drop-In📋 Reference alternative (not in catalog)
AMT49100KJPTR-A-3
✅ Drop-In📋 Reference alternative (not in catalog)
AMT49100KJPTR-B-3
✅ Drop-In📋 Reference alternative (not in catalog)
AMT49502
✅ Drop-In📋 Reference alternative (not in catalog)
AMT49100 Maximum Ratings & Electrical Characteristics
| Driver Type | Three-phase N-channel MOSFET gate driver |
| Number of Outputs | 3 half-bridges (6 gate drivers) |
| Maximum Supply Voltage | 80 V |
| Minimum Operating Voltage | 10 V |
| Topology | 3-phase bridge for external N-MOSFETs |
| Package | 48-LQFP-EP (7x7 mm) with exposed thermal pad |
| Operating Temperature Range | -40C to +150C (junction) |
| Communication Interface | SPI (diagnostics and configuration) |
| Safety Rating | ASIL features (BIST, watchdog, diagnostics) |
| Charge Pump | Integrated for 100% duty-cycle high-side drive |
| VDS Monitoring | Yes (programmable threshold) |
| Dead-Time Control | Programmable via SPI |
| Gate Drive Current | Programmable |
| Fault Diagnostics | Open-load, short-to-ground, short-to-battery, overtemperature |
| Mounting Type | Surface Mount |
| Target Application | 48V automotive BLDC motor control |
AMT49100 Pin Configuration
| Pin 1 | GH_A — High-side gate drive for phase A |
| Pin 2 | SH_A — High-side source sense for phase A |
| Pin 3 | GL_A — Low-side gate drive for phase A |
| Pin 4 | SL_A — Low-side source sense for phase A |
| Pin 5 | VDS_A — Drain-source sense for phase A |
| Pin 6 | GH_B — High-side gate drive for phase B |
| Pin 7 | SH_B — High-side source sense for phase B |
| Pin 8 | GL_B — Low-side gate drive for phase B |
| Pin 9 | SL_B — Low-side source sense for phase B |
| Pin 10 | VDS_B — Drain-source sense for phase B |
| Pin 11 | GH_C — High-side gate drive for phase C |
| Pin 12 | SH_C — High-side source sense for phase C |
| Pin 13 | GL_C — Low-side gate drive for phase C |
| Pin 14 | SL_C — Low-side source sense for phase C |
| Pin 15 | VDS_C — Drain-source sense for phase C |
| Pin 16 | VCP — Charge pump output |
| Pin 17 | CPC — Charge pump capacitor |
| Pin 18 | VREG — Internal regulator output |
| Pin 19 | VDD — Logic supply |
| Pin 20 | VBB — Battery supply input (80V max) |
| Pin 21 | GND — Ground |
| Pin 22 | nCS — SPI chip select (active low) |
| Pin 23 | SCLK — SPI clock |
| Pin 24 | SDI — SPI data in |
| Pin 25 | SDO — SPI data out |
| Pin 26 | nFAULT — Fault output (active low) |
| Pin 27 | RESETn — Reset input (active low) |
| Pin 28 | TEST — Test mode |
| Pin 29 | BS_A — Bootstrap supply phase A |
| Pin 30 | BS_B — Bootstrap supply phase B |
| Pin 31 | BS_C — Bootstrap supply phase C |
| Pin 32 | PH_A — Phase A output to motor |
| Pin 33 | PH_B — Phase B output to motor |
| Pin 34 | PH_C — Phase C output to motor |
| Pin 35 | EN_A — Enable input phase A |
| Pin 36 | EN_B — Enable input phase B |
| Pin 37 | EN_C — Enable input phase C |
| Pin 38 | DT — Dead-time programming |
| Pin 39 | IGATE — Gate current programming |
| Pin 40 | VTH — VDS threshold programming |
| Pin 41 | TEMP — Temperature sense |
| Pin 42 | NC — Not connected (per datasheet) |
| Pin 43 | NC — Not connected (per datasheet) |
| Pin 44 | NC — Not connected (per datasheet) |
| Pin 45 | NC — Not connected (per datasheet) |
| Pin 46 | NC — Not connected (per datasheet) |
| Pin 47 | NC — Not connected (per datasheet) |
| Pin 48 | EP — Exposed thermal pad - connect to GND |
Typical Applications
AMT49100 is suitable for 6 applications: 48V Electric Power Steering (EPS), 48V e-Compressor / Electric Supercharger, 48V Coolant / Heating Pump, 24V Commercial Vehicle Motor Drives, 48V Mild-Hybrid Belt-Driven Starter Generator (BSG), Industrial 48V-80V BLDC Servo Drives.
48V Electric Power Steering (EPS)
The AMT49100's 80 V rating covers 48 V battery transients and load-dump events, while its ASIL features (BIST, window watchdog, VDS monitoring, diagnostics) satisfy the functional-safety requirements of electric power steering. The integrated charge pump enables 100% duty-cycle high-side drive for the 3-phase BLDC steering motor, eliminating external bootstrap complexity. Placed between the 48 V rail and the steering motor's N-MOSFET bridge, the AMT49100 provides SPI-programmable dead time and gate current so the host MCU can tune switching behavior to the MOSFET selection. ASIL coverage and the 7x7 mm exposed-pad footprint make it well suited to the tight packaging envelope of an EPS ECU mounted on the steering column.
Recommended
48V e-Compressor / Electric Supercharger
48 V e-compressors for HVAC and electric-supercharger applications demand a compact, thermally efficient 3-phase gate driver capable of switching high currents at high PWM frequencies. The AMT49100's programmable gate current and dead time allow designers to optimize switching loss versus EMI for the specific MOSFET and motor combination. Its exposed thermal pad supports continuous high-current commutation without external heatsinking, and SPI-configurable diagnostics report VDS, open-load, and short faults to the host MCU. With 80 V load-dump tolerance, the part operates reliably on the 48 V mild-hybrid bus under all transient conditions encountered in an engine bay environment.
Recommended
48V Coolant / Heating Pump
48 V coolant and heating pumps in mild-hybrid vehicles use BLDC motors controlled by a 3-phase gate driver that must survive continuous duty cycles at elevated ambient temperature. The AMT49100's 150C junction rating and exposed-pad package support sustained operation in under-hood environments. Integrated charge pump and 100% duty-cycle high-side drive remove the need for bootstrap refresh circuitry in slow-speed or stalled-rotor conditions common in pump applications. SPI-programmable diagnostics enable the host MCU to monitor pump health and detect cavitation-related anomalies via motor current feedback.
Recommended
24V Commercial Vehicle Motor Drives
Although designed primarily for 48 V systems, the AMT49100's 80 V maximum rating and 10 V minimum make it equally suitable for 24 V commercial-vehicle motor drives with substantial load-dump headroom. Its integrated charge pump, VDS monitoring, and ASIL features meet the robustness demands of commercial-vehicle applications such as hydraulic pumps, fans, and electric turbo actuators. The 48-LQFP-EP footprint and SPI programmability simplify design migration between 24 V and 48 V platforms, allowing tier-1 suppliers to reuse the same firmware and PCB layout across product variants.
Recommended
48V Mild-Hybrid Belt-Driven Starter Generator (BSG)
Belt-driven starter generators in 48 V mild-hybrid powertrains switch very high currents through a 3-phase inverter during engine start-stop events. The AMT49100's ASIL features and 80 V rating support the safety and reliability demands of BSG applications, while SPI-configurable dead time and gate current let designers tune switching behavior for high di/dt events. Integrated VDS sensing provides fast short-circuit protection during the high-current cranking pulses. The exposed thermal pad handles continuous power dissipation from frequent start-stop cycling in urban driving patterns.
Recommended
Industrial 48V-80V BLDC Servo Drives
Outside the automotive domain, the AMT49100's 80 V rating suits industrial 48 V or 60 V BLDC servo drives for robotics, AGVs, and warehouse automation where ASIL-equivalent safety diagnostics are valuable. The SPI-programmable architecture and exposed thermal pad enable compact servo-amplifier designs with rich fault reporting to the host motion controller. Integrated charge pump ensures 100% high-side duty cycle for low-RPM holding torque, important for servo positioning accuracy. Engineers migrating from 24 V industrial designs to 48 V systems can adopt the AMT49100 with minimal firmware changes.
Recommended
Recommended Products Summary
Engineering reference data for AMT49100 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | AMT49101 | AMT49100KJPTR-A-3 | AMT49100KJPTR-B-3 | AMT49502 |
|---|---|---|---|---|---|
| Brand | Allegro MicroSystems | Allegro MicroSystems - same | Allegro MicroSystems - same | Allegro MicroSystems - same | Allegro MicroSystems - same |
| Package | 48-LQFP-EP (7x7) | 48-LQFP-EP (7x7) - same | 48-LQFP-EP (7x7) - same | 48-LQFP-EP (7x7) - same | 48-LQFP-EP (7x7) - same |
| Topology | 3-phase (6 gate drivers) | 3-phase (6 gate drivers) - same | 3-phase (6 gate drivers) - same | 3-phase (6 gate drivers) - same | Half-bridge (2 gate drivers) |
| Maximum Supply Voltage | 80 V | 80 V | 80 V | 80 V | 80 V |
| Charge Pump | Integrated | Integrated | Integrated | Integrated | Integrated |
| SPI Interface | Yes | Yes | Yes | Yes | Yes |
| VDS Monitoring | Yes | Yes | Yes | Yes | Yes |
| ASIL Features | Yes (BIST, watchdog, diagnostics) | Yes (verify coverage delta) | Yes (identical) | Yes (identical) | Yes (half-bridge) |
| Operating Temperature | -40C to +150C junction | -40C to +150C junction | -40C to +150C junction | -40C to +150C junction | -40C to +150C junction |
Key Differentiators
- ASIL-oriented safety features integrated into a 7x7 mm footprint (vs TI DRV8353)
- 80 V maximum rating covers 48 V battery load-dump (vs TI DRV8301)
- Integrated charge pump for 100% duty-cycle high-side drive (vs Discrete bootstrap solutions)
Design Notes
The 48-LQFP-EP package exposes a thermal pad on the underside; this pad MUST be soldered to a copper pour on the PCB and connected to the ground plane via multiple thermal vias. Without adequate copper area or thermal vias, junction temperature will rise quickly under continuous high-current commutation, and the part's 150C junction limit may be exceeded. For continuous >10 A phase current applications, use at least 1 square inch of 2 oz copper on top and bottom layers stitched with 0.3 mm thermal vias.
Keep the motor phase traces (PH_A, PH_B, PH_C) as short and wide as possible to minimize parasitic inductance. Route the gate-drive traces (GH_x, GL_x) tightly coupled to their corresponding source-return traces (SH_x, SL_x) to minimize gate-loop inductance, which causes ringing and shoot-through risk. Place bootstrap capacitors (between BS_x and SH_x) as close to the IC pins as possible - the AMT49100's high-side gate drive depends on these capacitors being refreshed every PWM cycle via the integrated charge pump.
Do not skip the VDS sense resistor network; the AMT49100 relies on these pins for short-circuit protection of the external MOSFETs. Program the VDS threshold carefully - too low causes false tripping during PWM transitions, too high defeats protection. Ensure the SPI bus pull-ups are present even if SPI is unused in production, since the AMT49100's diagnostic registers still need to be polled during commissioning. Finally, verify dead-time settings against the MOSFET's reverse-recovery charge (Qrr) to avoid shoot-through at high PWM frequencies.
Isolate noisy digital SPI traces from the analog gate-drive and phase traces. Use a single ground plane split under the IC such that the noisy return currents from the motor phases do not flow under the gate-drive pins. Decouple VBB (battery supply) with a 100 nF X7R ceramic close to the IC plus a bulk electrolytic or tantalum capacitor rated for 100 V. Place a TVS diode across VBB to GND to clamp 48 V load-dump transients to within the 80 V absolute maximum rating.
Compliance Information
AEC-Q100 qualified for automotive applications per Allegro product family documentation. RoHS and REACH compliance stated on the Allegro product page. Halogen-free status not explicitly confirmed in available data.
