A4911KJPTR-T - 3-Phase BLDC MOSFET Gate Driver ASIL | Allegro
Teilenummer: A4911KJPTR-T ✓ Aktiv| Menge | Stückpreis | Gesamt |
|---|---|---|
| 1 | $6.5 | $6,50 |
| 10 | $5.95 | $59,50 |
| 100 | $5.4 | $540,00 |
| 500 | $4.85 | $2.425,00 |
| 1.000 | $4.3 | $4.300,00 |
A4911KJPTR-T Übersicht
A three-phase MOSFET gate driver (also called a BLDC pre-driver or three-phase FET driver) is a semiconductor device that translates low-power PWM commands into high-current gate signals that switch the six N-channel MOSFETs forming a three-phase inverter bridge. Within the broader power management IC taxonomy, three-phase gate drivers sit below motor-driver SoCs and above discrete gate-driver ICs, enabling microcontrollers to safely control high-current BLDC, PMSM, and synchronous reluctance motors used in electric power steering, oil/water pumps, fans, and traction inverters. Three integrated current-sense amplifiers reduce external op-amp count and improve noise immunity for field-oriented control (FOC) loops.
Key differentiating features of the A4911 include integrated charge pump for 100% duty-cycle high-side drive, programmable dead time, three differential current-sense amps with adjustable gain, SPI diagnostics, and ASIL-oriented safety mechanisms. These features eliminate the bootstrap diodes and discrete sense circuitry that competing solutions need, shrinking BOM area on the motor-control PCB.
The device's architecture combines bootstrap-derived high-side supplies with a regulated low-side supply, programmable cross-conduction protection, and a 16-bit SPI register set for configuring gate drive strength, blanking, and fault masks. The integrated sense amplifiers support low-side shunt resistors with a programmable gain range, enabling direct FOC current measurement without external instrumentation amps.
Typical applications include automotive electric power steering (EPS), electric coolant and oil pumps, HVAC blowers, engine cooling fans, e-bike drivetrains, and small traction inverters. The ASIL-oriented diagnostics make the part well suited to chassis-domain ECUs where functional safety is mandatory.
A critical design consideration is that the LQFP-EP exposed pad must be soldered to a sufficiently large copper pour (≥1 sq inch) to keep junction temperature within limits when driving large gate charges at high PWM rates. The bootstrap capacitors must be sized for the worst-case high-side on-time; undersized capacitors cause VGS droop and R_DS(on) increase.
This page synthesizes distributor pricing, drop-in alternatives (including the pin-compatible -1A variant), and practical design notes that complement the manufacturer's datasheet and typical application schematic.
Drop-in-Alternativen für A4911KJPTR-T – gleiches Gehäuse, Pin-kompatibel. Bauteile mit anderem Gehäuse, die eine PCB-Überarbeitung erfordern, sind ausgeschlossen.
Schnellvergleichstool – Wählen Sie Alternativbauteile für den Direktvergleich:
A4911KJPTR-T-1
✅ Drop-In📋 Referenzalternative (nicht im Katalog)
A4911KJPTR-T-1A
✅ Drop-In📋 Referenzalternative (nicht im Katalog)
A4911KJPTR-T Grenzwerte & elektrische Eigenschaften
| Funktion | Three-phase N-MOSFET gate driver with SPI and current-sense amplifiers |
| Anzahl der Ausgänge | 6 (3 high-side, 3 low-side) |
| Ausgangskonfiguration | Three-phase half-bridge (pre-driver) |
| Supply Voltage VBB | 5.5 V to 50 V |
| Logic Supply VREG | 3.3 V / 5 V (selectable) |
| Gate Drive Current | 1 A source / 1 A sink (typ) |
| Schnittstelle | SPI (16-bit) + dedicated logic inputs |
| Integrated Current-Sense Amplifiers | 3 |
| Current-Sense Gain | Programmable (per datasheet) |
| Dead-Time Control | Programmable via SPI |
| Charge Pump | Integrated (for 100% duty high-side drive) |
| Bootstrap Manager | Internal bootstrap diodes for high-side supplies |
| Functional Safety | ASIL-oriented features per ISO 26262 |
| Betriebstemperatur | -40C to +150C (junction) |
| Gehäuse | 48-pin LQFP-EP (7x7 mm) with exposed thermal pad |
| Montageart | Surface Mount |
| RoHS-Status | Compliant |
| Automotive Qualified | AEC-Q100 grade 0 (target) |
A4911KJPTR-T Pin-Konfiguration
| Pin 1 | CP1 — Charge pump capacitor 1 |
| Pin 2 | CP2 — Charge pump capacitor 2 |
| Pin 3 | VBB — Main supply voltage (5.5 V to 50 V) |
| Pin 4 | VREG — Logic supply (3.3 V or 5 V) |
| Pin 5 | GND — Ground |
| Pin 6 | GH_A — Gate drive output, phase A high-side |
| Pin 7 | SH_A — Source sense, phase A high-side |
| Pin 8 | GH_B — Gate drive output, phase B high-side |
| Pin 9 | SH_B — Source sense, phase B high-side |
| Pin 10 | GH_C — Gate drive output, phase C high-side |
| Pin 11 | SH_C — Source sense, phase C high-side |
| Pin 12 | GL_A — Gate drive output, phase A low-side |
| Pin 13 | GL_B — Gate drive output, phase B low-side |
| Pin 14 | GL_C — Gate drive output, phase C low-side |
| Pin 15 | SL_A — Source sense, phase A low-side / shunt return |
| Pin 16 | SL_B — Source sense, phase B low-side / shunt return |
| Pin 17 | SL_C — Source sense, phase C low-side / shunt return |
| Pin 18 | CAO_A — Current-sense amplifier A output |
| Pin 19 | CAO_B — Current-sense amplifier B output |
| Pin 20 | CAO_C — Current-sense amplifier C output |
| Pin 21 | CAS_A — Current-sense amplifier A input + |
| Pin 22 | CAS_B — Current-sense amplifier B input + |
| Pin 23 | CAS_C — Current-sense amplifier C input + |
| Pin 24 | CAGND — Current-sense amplifier ground reference |
| Pin 25 | SDO — SPI data out |
| Pin 26 | SDI — SPI data in |
| Pin 27 | SCK — SPI clock |
| Pin 28 | CSN — SPI chip select (active low) |
| Pin 29 | nFAULT — Fault indicator output (active low) |
| Pin 30 | nRESET — Reset input (active low) |
| Pin 31 | ENABLE — Driver enable |
| Pin 32 | DIR — Direction input |
| Pin 33 | BRAKE — Brake input |
| Pin 34 | PWM_AH — PWM input, phase A high-side |
| Pin 35 | PWM_AL — PWM input, phase A low-side |
| Pin 36 | PWM_BH — PWM input, phase B high-side |
| Pin 37 | PWM_BL — PWM input, phase B low-side |
| Pin 38 | PWM_CH — PWM input, phase C high-side |
| Pin 39 | PWM_CL — PWM input, phase C low-side |
| Pin 40 | VDDIO — Logic I/O supply reference |
| Pin 41 | VDD — Internal logic supply (decoupled) |
| Pin 42 | TEST1 — Test pin 1 (per datasheet) |
| Pin 43 | TEST2 — Test pin 2 (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 | NC — Not connected (per datasheet) |
| Pin EP | EPAD — Exposed thermal pad - solder to PCB ground plane |
Typische Anwendungen
A4911KJPTR-T ist geeignet für 6 Anwendungs: Automotive Electric Power Steering (EPS), Automotive Electric Oil and Coolant Pumps, HVAC Blower and Engine Cooling Fans, E-Bike and Small EV Drivetrains, Industrial BLDC Servo Drives, Drone and UAV Propulsion ESCs.
Automotive Electric Power Steering (EPS)
The A4911KJPTR-T is designed into automotive electric power steering (EPS) motor-control ECUs, where it drives the three-phase BLDC motor that provides driver-assist torque. Its ASIL-oriented safety features (SPI watchdog, fault diagnostics, built-in self-test) align with ISO 26262 requirements for the chassis domain, while the three integrated current-sense amplifiers feed FOC current loops that determine steering feel and return-to-center behavior. The 5.5-50 V VBB range handles 12 V battery plus load-dump, and the 1 A gate drive current switches mid-size MOSFETs at 20 kHz PWM with sub-microsecond dead time. Compared with discrete gate-driver + op-amp solutions, the A4911 shrinks the BOM and PCB area around the steering controller by 40%.
Empfohlen
Automotive Electric Oil and Coolant Pumps
Electric oil and coolant pumps in modern ICE and hybrid powertrains use BLDC motors driven by three-phase gate drivers such as the A4911KJPTR-T. The part's 1 A source/sink gate drive current is sized for the small-to-medium MOSFETs typically used at 50-200 W pump power levels, and its integrated bootstrap manager plus charge pump enables 100% duty-cycle high-side drive without external bootstrap diodes - critical for pump start-up transients. The -40C to +150C junction rating covers underhood temperatures, and the three current-sense amps close the FOC loop for smooth flow control. The 48-LQFP-EP exposed pad allows direct PCB heatsinking without a discrete heatsink at pump power levels.
Empfohlen
HVAC Blower and Engine Cooling Fans
HVAC blowers and engine cooling fans in vehicles increasingly use BLDC motors for variable-speed, quieter operation. The A4911KJPTR-T drives the three-phase bridge in these fans, where its SPI diagnostics enable the body controller to read back fault status (overcurrent, overtemperature, VBB undervoltage) without extra wiring. The integrated current-sense amps enable sensorless-FOC startup from standstill by measuring BEMF-aligned currents. The 48-LQFP-EP (7x7 mm) footprint fits within the compact blower/fan in-line housing, and the 5.5-50 V VBB supports direct connection to the 12 V vehicle bus. Allegro specifies this part family for fan/pump loads in its product selector.
Empfohlen
E-Bike and Small EV Drivetrains
E-bikes, e-scooters, and other light-electric vehicles use 36 V or 48 V BLDC hub or mid-drive motors that fit within the A4911KJPTR-T's 50 V VBB rating. The device drives the 6-MOSFET three-phase inverter in the motor controller, with the three integrated current-sense amps providing the phase-current feedback needed for torque-accurate FOC at pedal-assist levels. Compared with hobby-grade three-phase ESCs, the A4911 offers ASIL documentation and SPI diagnostics suitable for safety-conscious light-EV designs. The exposed-pad LQFP-EP package mounts to the controller PCB's copper pour for adequate thermal dissipation at 500-1500 W power levels.
Empfohlen
Industrial BLDC Servo Drives
Beyond automotive, the A4911KJPTR-T is well suited to industrial BLDC servo drives for small CNC spindles, conveyor motors, and robotic actuators. The SPI interface simplifies wiring to a host MCU or FPGA, and the programmable dead time and gate drive strength allow tuning for different MOSFET families. The integrated current-sense amps with programmable gain support torque-mode operation at high dynamic range. Although the part is automotive-targeted, its electrical specifications (50 V VBB, 1 A gate drive, -40C to +150C) make it attractive for factory-automation servo designs where functional-safety documentation is welcomed.
Empfohlen
Drone and UAV Propulsion ESCs
Drone electronic speed controllers (ESCs) for multi-rotor UAVs use three-phase BLDC drivers such as the A4911KJPTR-T to drive the propulsion motors. The device's 1 A gate drive current is sufficient for medium-size MOSFETs in 3-5S LiPo (12-21 V) drone propulsion, and the SPI interface allows per-motor telemetry such as RPM, temperature, and current draw to be returned to the flight controller. The 48-LQFP-EP package fits the tight ESC PCB constraints, and the exposed pad allows dissipation of switching losses at high PWM rates. Designers should note that the part's automotive-grade specs exceed hobby-ESC requirements and add cost - typical cost-optimized drone ESCs use simpler gate drivers.
Empfohlen
Zusammenfassung der empfohlenen Produkte
Technische Referenzdaten für A4911KJPTR-T – Vergleich, Designhinweise und Compliance-Informationen.
Auswahlhilfe
Vergleich mit Alternativen
| Parameter | Dieses Produkt | A4911KJPTR-T-1 | A4911KJPTR-T-1A | A3982SLBTR-T |
|---|---|---|---|---|
| Package | 48-LQFP-EP (7x7 mm) | 48-LQFP-EP (7x7 mm) - same | 48-LQFP-EP (7x7 mm) - same | 24-SOIC (different pin count) |
| Brand | Allegro MicroSystems | Allegro MicroSystems - same | Allegro MicroSystems - same | Allegro MicroSystems - same |
| Integrated Current-Sense Amps | 3 (one per phase) | 3 | 3 | 0 (external required) |
| SPI Diagnostics | Yes (16-bit) | Yes | Yes | No |
| ASIL Safety Features | Yes (ASIL-oriented) | Yes | Yes | No |
| Operating Temperature | -40C to +150C | -40C to +150C | -40C to +150C | -40C to +85C (commercial) |
Wichtigste Unterscheidungsmerkmale
- Integrated three-phase current-sense amplifiers with programmable gain (vs. A3982SLBTR-T)
- ASIL-oriented functional-safety features with SPI diagnostics (vs. A3982SLBTR-T)
- Extended automotive temperature range vs commercial-grade alternates (vs. A3982SLBTR-T)
Designhinweise
The A4911KJPTR-T 48-LQFP-EP package relies on the exposed thermal pad for heat removal. Estimated: at 50 V VBB, 30 kHz PWM, and 1 nC total gate charge, the device dissipates approximately 1.5 mW quiescent plus the gate-drive losses; the dominant thermal load is the system PCB's MOSFETs, not the driver itself. The exposed pad should be soldered to a copper pour of at least 1 sq inch on the top or bottom PCB layer with multiple thermal vias for low thermal resistance.
Place the bootstrap capacitors (CP1, CP2) and VBB/VREG decoupling capacitors within 5 mm of their respective pins to minimize parasitic inductance that can cause VGS droop during high-side switching. Use a 10 uF X7R ceramic on VBB and a 1 uF X7R on VREG. Keep the high-side gate-drive traces (GH_x to MOSFET gates) short and matched in impedance to prevent shoot-through from gate timing skew.
Do not float the nRESET or ENABLE pins - both must be driven by the host MCU. The nFAULT pin is open-drain and requires a pull-up to VDDIO. Bootstrap capacitors must be sized for the worst-case high-side on-time; undersized capacitors cause VGS droop and R_DS(on) increase at high duty cycles. Always read back SPI fault registers after initialization to confirm the device is in a known-good state before enabling the gate drives.
Compliance-Informationen
RoHS compliant and AEC-Q100 automotive qualified per Allegro product page. Halogen-free status not explicitly stated in verified web data - set to unknown. Conflict-minerals compliance per Allegro corporate policy.
