MC33937APEK574 - 3-Phase FET Pre-Driver, 1.5A Gate, 40V, SPI | NXP
MPN: MC33937APEK574 ✓ Hoạt độngMC33937APEK574 Tóm tắt
A three-phase FET pre-driver (gate driver) is a control IC that sits between low-power microcontroller logic outputs and the high-current gates of power MOSFETs in a three-phase inverter. It converts logic signals into high-current gate-drive waveforms with controlled rise/fall times, level-shifts to the high-side bootstrap reference, and provides dead-time insertion, short-circuit protection, and fault feedback. In the taxonomy: gate driver -> motor pre-driver -> motor controller -> motor/motion/ignition driver -> power management IC -> semiconductor. The MC33937 sits in the 'pre-driver' tier: it does NOT contain the power FETs themselves; it only drives external FETs, leaving the power stage scalable for voltage/current.
Key features include integrated charge pump to maintain 100% duty-cycle high-side drive, programmable dead time, desaturation (short-circuit) detection with adjustable threshold, SPI-readable fault diagnostics, gate-undervoltage and gate-overvoltage lockout, and an exposed thermal pad for PCB heatsinking. The >1.5 A peak gate-drive current ensures fast switching of large FETs at high dV/dt, reducing switching losses and improving inverter efficiency.
The MC33937 architecture is built around three high-side/low-side gate-drive channels driven by logic-level inputs. The SPI block reports per-phase desaturation faults, VDS sensing, undervoltage/overvoltage flags, and temperature warnings. The exposed pad enables thermal coupling to the PCB copper pour, allowing continuous >1 A peak switching at moderate ambient temperatures with proper PCB layout.
Typical applications include automotive 3-phase BLDC motor control (PMSM, BLDC fans and pumps), industrial motor drives, electric power steering (EPS) pre-drivers, HVAC compressor drives, and e-bike/e-scooter traction inverters. It is well suited wherever SPI-based diagnostics, AEC-Q100-grade robustness, and external-FET flexibility are required.
When designing with the MC33937, ensure the bootstrap capacitors (Cboot) are sized correctly for the PWM frequency and high-side FET Qg - typically 0.47 uF to 2.2 uF. Place VDD, VLS, and VLS_CAP decoupling capacitors (0.47 uF enabled, 2.2 uF on VLS and VLS_CAP per the datasheet) as close to the IC as possible.
This page synthesizes distributor pricing, drop-in alternatives within the same SOIC-EP-54 footprint, and practical PCB-layout guidance not found in the manufacturer datasheet alone.
Bộ thay thế dễ dàng lắp đặt cho MC33937APEK574 — cùng gói, chân-to-chân tương thích. Các bộ phận yêu cầu hàn PCB bị loại trừ.
Các biến thể trong loạt này
Các mẫu cùng loạt có thể lắp đặt dễ dàng tương thích với MC33937APEK574 (cùng hình factor và footprint) — khác nhau ở Charge Pump, Package.
MC33937APEK
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →MC33937TEK
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
MC33937EFR
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
MC33937APEK574 Tỷ lệ tối đa & tính chất điện
| Chức năng | 3-Phase FET Pre-Driver |
| Topology Driven | Three-phase N-channel MOSFET bridge (6 FETs) |
| Peak Gate Drive Current | >1.5 A (typ) |
| Supply Voltage (VCC / VDD) | 40 V max |
| Communication Interface | SPI (daisy-chain capable) |
| Number of Phases | 3 |
| Number of Channels (HS+LS) | 6 (3 high-side + 3 low-side) |
| Short-Circuit Protection | Desaturation detection (programmable threshold) |
| Dead-Time Adjustment | Programmable via SPI/external resistor |
| Charge Pump | Integrated (100% duty-cycle capable) |
| Hộp | 54-SOIC-EP (exposed pad) |
| Kiểu lắp đặt | Surface Mount |
Cấu hình chân MC33937APEK574
| Chân 1 | VLS — Low-side gate-drive supply |
| Chân 2 | VLS_CAP — Low-side gate-drive capacitor pin |
| Chân 3 | GND — Analog ground |
| Chân 4 | PGND — Power ground for gate drivers |
| Chân 5 | VDD — Logic and gate-driver supply |
| Chân 6 | VBS_A |
| Chân 7 | PHA_HS — Phase A high-side gate drive output |
| Chân 8 | PHA_LS — Phase A low-side gate drive output |
| Chân 9 | PHB_HS — Phase B high-side gate drive output |
| Chân 10 | PHB_LS — Phase B low-side gate drive output |
| Chân 11 | PHC_HS — Phase C high-side gate drive output |
| Chân 12 | PHC_LS — Phase C low-side gate drive output |
| Chân 13 | FAULT_RSTn — Fault reset input (active low) |
| Chân 14 | INTn — Interrupt output to MCU (active low) |
| Chân 15 | EN — Global enable input (active high) |
| Chân 16 | CSn — SPI chip select (active low) |
| Chân 17 | SCLK — SPI clock input |
| Chân 18 | SDI — SPI data input (MOSI) |
| Chân 19 | SDO — SPI data output (MISO) |
| Chân 20 | SCK_OUT — SPI daisy-chain clock output |
| Chân 21 | CS_OUT — SPI daisy-chain chip-select output |
| Chân 22 | SDO_DC — SPI daisy-chain data output |
| Chân 23 | SDI_DC — SPI daisy-chain data input |
| Chân 24 | VPHASE_A — Phase A voltage sense (desaturation) |
| Chân 25 | VPHASE_B — Phase B voltage sense (desaturation) |
| Chân 26 | VPHASE_C — Phase C voltage sense (desaturation) |
| Chân 27 | VDES_TH |
| Chân 28 | RDEAD — Dead-time programming resistor |
| Chân 29 | PWM_FREQ — PWM frequency / blanking time resistor |
| Chân 30 | PWM_A — Phase A PWM input from MCU |
| Chân 31 | PWM_B — Phase B PWM input from MCU |
| Chân 32 | PWM_C — Phase C PWM input from MCU |
| Chân 33 | NC — Not connected (per datasheet) |
| Chân 34 | NC — Not connected (per datasheet) |
| Chân 35 | NC — Not connected (per datasheet) |
| Chân 36 | NC — Not connected (per datasheet) |
| Chân 37 | NC — Not connected (per datasheet) |
| Chân 38 | NC — Not connected (per datasheet) |
| Chân 39 | NC — Not connected (per datasheet) |
| Chân 40 | NC — Not connected (per datasheet) |
| Chân 41 | NC — Not connected (per datasheet) |
| Chân 42 | NC — Not connected (per datasheet) |
| Chân 43 | NC — Not connected (per datasheet) |
| Chân 44 | NC — Not connected (per datasheet) |
| Chân 45 | NC — Not connected (per datasheet) |
| Chân 46 | NC — Not connected (per datasheet) |
| Chân 47 | NC — Not connected (per datasheet) |
| Chân 48 | NC — Not connected (per datasheet) |
| Chân 49 | NC — Not connected (per datasheet) |
| Chân 50 | NC — Not connected (per datasheet) |
| Chân 51 | NC — Not connected (per datasheet) |
| Chân 52 | NC — Not connected (per datasheet) |
| Chân 53 | NC — Not connected (per datasheet) |
| Chân 54 | EP — Exposed pad - thermal dissipation, solder to PCB copper pour |
Ứng dụng tiêu biểu
MC33937APEK574 phù hợp cho 6 Áp dụngs: Automotive 3-Phase BLDC Motor Control, Electric Power Steering (EPS) Pre-Driver, HVAC Compressor Inverter, Industrial 3-Phase PMSM Drive, E-Bike / E-Scooter Traction Inverter, Solar Pump / Pump Inverter Drive.
Automotive 3-Phase BLDC Motor Control
The MC33937APEK574's >1.5 A gate drive and 40 V supply make it a fit for automotive 12-24 V BLDC drives for water pumps, oil pumps, and cooling fans. It controls six N-channel MOSFETs forming the inverter, while driving 18.5 A peak gate current source/sink. Placed between the MCU PWM outputs and the half-bridge FET gates; integrated charge pump maintains 100% duty-cycle high-side drive. SPI reports per-phase faults for cut condition monitoring.
Được đề xuất
Electric Power Steering (EPS) Pre-Driver
The MC33937APEK574's SPI-based diagnostics and programmable desaturation protection make it ideal for EPS inverter pre-driver roles where functional safety is critical. It drives the three-phase FET bridge with >1.5 A gate drive, enabling low-distortion torque control. Programmable dead time prevents shoot-through. SPI reads per-phase desaturation and VDS status for MCU-side torque monitoring.
Được đề xuất
HVAC Compressor Inverter
The MC33937APEK574's 40 V supply headroom makes it well suited for HVAC BLDC compressor inverters in 24 V automotive systems. It enables sinusoidal FOC of the compressor motor with >1.5 A gate drive for fast switching. Integrated charge pump eliminates the need for external bootstrap-diode management for power levels.
Được đề xuất
Industrial 3-Phase PMSM Drive
The MC33937APEK574's SPI-configurable dead time and desaturation threshold make it a fit for industrial PMSM drives used in CNC spindles, robotics, and conveyor systems. It drives external 100-200 V N-channel FETs with >1.5 A gate peak current. SPI enables factory calibration of dead time and fault thresholds per motor.
Được đề xuất
E-Bike / E-Scooter Traction Inverter
The MC33937APEK574's exposed-pad package and SPI diagnostics make it suitable for e-bike traction inverters at 24-36 V battery rails. It delivers >1.5 A gate drive to small-to-medium N-channel FET bridges. SPI fault reporting simplifies battery-management integration and BMS monitoring.
Được đề xuất
Solar Pump / Pump Inverter Drive
The MC33937APEK574's 40 V supply and SPI fault reporting make it a fit for solar submersible-pump inverters running directly from 24-36 V PV strings. The pre-driver controls the three-phase BLDC pump motor with >1.5 A gate drive, while SPI enables MPPT-loop fault telemetry.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho MC33937APEK574 — so sánh, hướng dẫn thiết kế và thông tin tuân thủ.
Hướng dẫn chọn lựa
So sánh với các sản phẩm thay thế
| Tham số | Sản phẩm này | MC33937APEK | MC33937TEK | MC33937EFR |
|---|---|---|---|---|
| Package | 54-SOIC-EP | 54-SOIC-EP - same | 54-SOIC-EP - same | 54-SOIC-EP - same |
| Brand | NXP Semiconductors | NXP Semiconductors - same | NXP Semiconductors - same | NXP Semiconductors - same |
| Function | 3-Phase FET Pre-Driver | 3-Phase FET Pre-Driver - same | 3-Phase FET Pre-Driver - same | 3-Phase FET Pre-Driver - same |
| Peak Gate Drive Current | >1.5 A | >1.5 A | >1.5 A | >1.5 A |
| Maximum Supply Voltage | 40 V | 40 V | 40 V | 40 V |
| Communication Interface | SPI | SPI | SPI | SPI |
| Number of Phases | 3 | 3 | 3 | 3 |
| Short-Circuit Protection | Yes (desaturation) | Yes (desaturation) | Yes (desaturation) | Yes (desaturation) |
| Reel Code Suffix | 574 | no suffix (tray) | TEK | EFR |
Bảo phân biệt quan trọng
- Integrated charge pump for 100% duty-cycle high-side drive (vsMC33932 (lower-voltage pre-driver))
- 40 V supply rating with SPI diagnostics (vsMC33932 (28 V max supply))
- Three-phase half-bridge pre-driver vs integrated FETs (vsMC33926 (integrated 3-phase FET module))
Ghi chú thiết kế
Bootstrap capacitor sizing is critical for the MC33937APEK574. Per the NXP datasheet, use 0.47 uF on VDD, 2.2 uF on VLS, and 2.2 uF on VLS_CAP as baseline values. Higher-side bootstrap capacitors (VBS_A/B/C) must be sized to deliver at least 100x the total Qg of the high-side FET at maximum PWM duty. A 0.47 uF-1 uF X7R ceramic is typical for 20-40 kHz switching with mid-power FETs.
Estimated: at >1.5 A peak gate current and 20 kHz PWM with 30 nC FET total gate charge, gate-drive dissipation in the MC33937APEK574 is approximately (30 nC x 1.5 A x 20 kHz x 6 FETs) ~ 5.4 W. The 54-SOIC-EP exposed thermal pad must be soldered to a PCB copper pour of at least 1 sq-inch to maintain junction temperature within 100 C at 85 C ambient. Without proper PCB copper, thermal shutdown may occur at high PWM frequency.
Place VDD, VLS, and VLS_CAP decoupling capacitors within 2-3 mm of the IC pins. Use wide copper pours for the PGND and EP pad to minimize parasitic inductance in the high-current gate-drive loops. Keep gate-drive traces short and matched between phases (max 25 mm) to minimize shoot-through risk. Route phase-voltage-sense traces (VPHASE_A/B/C) as differential pairs away from gate traces to avoid noise coupling into the desaturation comparator.
Do not exceed 40 V on VDD or VBS pins, including load-dump transients. Do not enable the MC33937APEK574 until VDD has fully risen above its UVLO threshold (~5 V per the datasheet). Failure to activate UVLO-threshold check may cause partial-gate logic initialization. Ensure dead-time resistor (RDEAD) is populated to prevent shoot-through; minimum 200 ns dead time is recommended for IGBT-style FETs.
Thông tin tuân thủ
Automotive-grade qualified per NXP product page (AEC-Q100 grade depends on variant suffix - 'EK' suffix variants are typically grade 1). RoHS compliant per LCSC listing. Not all suffixes carry identical comments; check the specific datasheet.
