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Allegro MicroSystems A4935KJP-T
- Part No.:
- A4935KJP-T
- Manufacturer:
- Allegro MicroSystems
- Category:
- Motor Drivers, Controllers
- Package:
- 48-LQFP Exposed Pad
- Datasheet:
-
A4935KJP-T.pdf
- Description:
- IC MOTOR DRIVER 3V-5.5V 48LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:2,762
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Product details
Overview
A4935KJP-T from Allegro MicroSystems is a 3-phase N-channel MOSFET pre-driver IC designed for automotive BLDC motor control, featuring integrated high-side/low-side gate drives, adjustable dead time (0–6 µs), uncommitted current sense amplifier with –1.5 V to 4 V common-mode range, and operation from 5.5 V to 50 V battery supply - used in electric power steering (EPS) and HVAC blower modules.
For engineers reviewing the A4935KJP-T datasheet, A4935KJP-T pinout, A4935KJP-T application, or A4935KJP-T equivalent, key selection considerations include its K-grade (–40°C to 150°C) junction temperature rating, 48-pin LQFP package with exposed thermal pad, bootstrap + top-off charge pump architecture enabling DC high-side drive, and diagnostic serial fault register accessible via FF1/FF2 pins.
Technical Context
The A4935KJP-T implements dual charge pump regulation: a main boost converter (CP1/CP2) maintains ≥10 V gate drive down to VBB = 7 V, while per-phase top-off pumps sustain high-side bias during 100% duty cycle. It supports both block commutation and sinusoidal excitation via independent xHI/xLO or shared PWMH/PWML inputs.
Protection logic includes programmable short-to-ground/supply detection using VDSTH threshold (0.1–2 V), overtemperature latching at TJ = 150°C ±20°C, and undervoltage lockout on VREG (7.5–8.5 V), VDD (2.45–2.85 V), and bootstrap (59–69% of VREG). Diagnostics are reported through open-drain FF1/FF2 flags and a serial 8-bit fault register.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBB Supply Range | 5.5 V to 50 V - supports wide automotive battery transients including cold-crank (6.5 V) and load-dump (42 V) |
| Operating Temp (TA) | –40°C to 150°C - qualified for under-hood automotive applications per AEC-Q100 Grade 0 |
| Gate Drive Outputs | 6-channel (3 high-side GHx, 3 low-side GLx) - each capable of 150 mA sink/source at 25°C |
| Dead Time Control | Resistor-adjustable (RDEAD) - 0 ns (RDEAD = AGND) to 6 µs (RDEAD = VDD), prevents shoot-through |
| Current Sense Amp | Uncommitted differential amplifier - supports low-side sensing with –1.5 V common-mode input range |
| VREG Output | 12.5–13.8 V @ 15 mA - powers internal circuitry and bootstrap capacitors; regulated by charge pump below 16 V VBB |
| Fault Diagnostics | Serial 8-bit fault register - readable via FF1/FF2 timing protocol; reports UVLO, OTF, short-to-GND/SUPPLY, bootstrap UV |
Pinout & Package
Package: 48-pin LQFP with exposed thermal pad (suffix JP), 7 mm × 7 mm footprint, 0.5 mm pitch, lead-free with 100% matte tin plating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GHA, GHB, GHC | High-side gate drive outputs | Source/sink up to 150 mA; require external gate resistors for dv/dt control; referenced to SA/SB/SC |
| GLA, GLB, GLC | Low-side gate drive outputs | Sink current to LSS; enable synchronous rectification; referenced to AGND |
| CA, CB, CC | Bootstrap capacitor positive terminals | Provide floating supply for high-side drivers; charged to ~VREG when Sx is low |
| SA, SB, SC | Phase output terminals | Connect directly to motor phases; serve as return path for high-side gate discharge current |
| CSP, CSN | Differential current sense inputs | Accept –1.5 V to 4 V common-mode voltage; support Kelvin-sense resistor placement below ground |
| RDEAD | Dead time configuration input | Resistor-to-AGND sets tDEAD from 0 ns to 3.5 µs; tied to VDD defaults to 6 µs |
| FF1, FF2 | Open-drain fault flag outputs | Encode fault type and latch status via pulse-width modulation; enable serial readout of 8-bit fault register |
Key Features
| Feature | Design Value |
|---|---|
| Top-off charge pump per phase | Enables true 100% duty-cycle high-side drive without bootstrap capacitor depletion |
| Adjustable crossover protection | Prevents shoot-through via resistor-programmable dead time (0–6 µs), configurable per application safety requirements |
| Wide VBB operating range | 5.5 V to 50 V supports start-stop systems, 12 V/24 V architectures, and transient immunity per ISO 7637-2 |
| Integrated diagnostics | Real-time reporting of VDD/VREG/Bootstrap UVLO, overtemperature (150°C), and per-FET short-circuit faults |
| Automotive-grade thermal design | RθJA = 23°C/W (4-layer PCB); RθJP = 2°C/W - enables high-power motor drive in compact layouts |
Applications
| Electric Power Steering (EPS) | HVAC Blower Motor |
|---|---|
Use Scenario: High-reliability 3-phase BLDC drive in vehicle steering column, subject to vibration, temperature cycling, and EMI. IC Role / Device Role / Timing Role: Pre-driver controlling six external N-channel MOSFETs; manages gate timing, current sensing, and fault response within <200 ns propagation delay. Use Value: Enables fail-safe coast mode via COAST pin during short-circuit events; latched fault register allows post-fault root-cause analysis without microcontroller intervention. | Use Scenario: Variable-speed cabin air circulation system requiring smooth torque delivery and acoustic noise reduction. IC Role / Device Role / Timing Role: Sinusoidal excitation controller using independent PWM per phase; leverages uncommitted current sense amp for closed-loop peak current limiting. Use Value: Adjustable dead time minimizes torque ripple; 150°C junction rating ensures uninterrupted operation in hot under-dash environments. |
| Transmission Valve Actuator | Onboard Charger Cooling Fan |
Use Scenario: Precision hydraulic valve positioning in automatic transmission, demanding precise current control and fast fault shutdown. IC Role / Device Role / Timing Role: Block commutation driver with real-time drain-source voltage monitoring (VDSTH/VDRAIN) for short-circuit detection. Use Value: Short-to-ground fault detection with ±100 mV offset tolerance avoids false triggers during PWM transitions; ESF pin configures immediate coast-on-fault behavior. | Use Scenario: Forced-air cooling for EV onboard chargers, requiring robust operation across 12 V–48 V input and high ambient temperatures. IC Role / Device Role / Timing Role: High-side PWM driver using PWMH input; utilizes VREG-regulated 13 V gate drive to maintain RDS(on) stability across battery voltage drop. Use Value: Charge pump sustains >10 V gate drive down to VBB = 7 V - ensures consistent FET conduction during engine cranking. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 3-phase gate driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP6532GQ-Z | Single-supply (4.5–35 V), no charge pump; requires external high-side supply or bootstrap diode; lacks serial fault register | Targeted at industrial fans/pumps where automotive qualification and advanced diagnostics are not required | Select MP6532GQ-Z only if cost sensitivity outweighs need for AEC-Q100 compliance and integrated diagnostics |
| DRV8305PAPR | Integrated current sense amplifiers (not uncommitted); fixed 1.5 µs dead time; no top-off charge pump; SPI interface instead of FF1/FF2 serial read | Optimized for space-constrained consumer drones and e-bikes; lower thermal resistance but limited to 40 V max VBB | Choose DRV8305PAPR when board area is critical and diagnostics can be handled via SPI rather than timing-based serial read |
Compared with MP6532GQ-Z and DRV8305PAPR, the A4935KJP-T uniquely combines AEC-Q100 Grade 0 qualification, resistor-adjustable dead time, top-off charge pump for true 100% PWM, and fault register access without SPI - making it the only option qualified for safety-critical automotive powertrain functions.
Availability
A4935KJP-T is available at Aetrix Electronics and suitable for electric power steering (EPS), HVAC blower motors, and transmission actuator systems requiring stable component supply across extended temperature and automotive lifecycle demands.
Supply support for A4935KJP-T includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Allegro MicroSystems is a U.S.-based designer of high-performance magnetic sensors and power ICs, specializing in motion control and energy-efficient power conversion solutions.
The A4935 product line delivers automotive-qualified 3-phase gate drivers with integrated diagnostics and thermal resilience - engineered specifically for electric power steering, brake-by-wire, and other ASIL-B–capable motor control systems.
FAQ
What is the maximum junction temperature specification for the A4935KJP-T?
The A4935KJP-T has a maximum junction temperature (TJ(max)) of 150°C, with transient capability up to 175°C for ≤10 seconds (lifetime total ≤10 hours). This rating is validated per AEC-Q100 Grade 0 and enables operation in under-hood automotive environments where ambient temperatures exceed 125°C. The A4935KJP-T datasheet specifies RθJA = 23°C/W on a 4-layer JEDEC PCB, allowing accurate thermal design for sustained 150°C junction operation.
How does the A4935KJP-T achieve 100% duty cycle high-side drive?
The A4935KJP-T achieves true 100% duty cycle high-side drive using a per-phase top-off charge pump that replenishes gate charge lost due to high-side driver bias current (<20 µA). Unlike standard bootstrap operation - which fails when Sx remains high - the top-off pump actively maintains Cx voltage above VREG, ensuring continuous gate-source voltage. This function is enabled automatically after GHx turn-on and requires no external components beyond the standard CP1/CP2 capacitor. The A4935KJP-T's architecture eliminates reliance on switching transitions to refresh the bootstrap supply.
Can the A4935KJP-T be used with 3.3 V microcontrollers?
Yes, the A4935KJP-T is fully compatible with 3.3 V logic-level microcontrollers. Its logic supply (VDD) accepts 3.0 V to 5.5 V, and all digital inputs (xHI/xLO, PWMH/PWML, RDEAD, RESET, CCEN, ESF) have 0.3×VDD low threshold and 0.7×VDD high threshold with 500 mV hysteresis. Input leakage remains below ±1 µA across temperature, ensuring reliable interfacing without level-shifting. The A4935KJP-T's design explicitly supports mixed-voltage systems common in modern automotive ECUs where core logic runs at 3.3 V while power domains operate at higher voltages.
What fault conditions trigger latched shutdown in the A4935KJP-T?
Latched shutdown in the A4935KJP-T occurs for VDD undervoltage, VREG undervoltage, bootstrap undervoltage, and short-circuit faults - but only when the ESF pin is high. In this configuration, detected faults force all gate drives low and set persistent FF1/FF2 flags until cleared by a low pulse on RESET (≤3.5 µs) or completion of a serial fault register read. Overtemperature faults (TJ ≥ 150°C) also disable outputs but are not latched - recovery occurs automatically once TJ falls below 135°C (15°C hysteresis). The A4935KJP-T's latching behavior ensures safety-critical systems retain fault state visibility across power cycles.
How is dead time configured on the A4935KJP-T, and what are the valid ranges?
Dead time on the A4935KJP-T is configured via an external resistor (RDEAD) connected between the RDEAD pin and AGND. Valid values range from 0 Ω (direct AGND tie) to 240 kΩ, yielding tDEAD from 0 ns (no internal dead time) to 3.5 µs. At RDEAD = 30 kΩ, tDEAD = 815–1110 ns; at RDEAD = VDD, tDEAD defaults to 6 µs typical. This resistor-based method allows precise tuning of shoot-through prevention without firmware changes. The A4935KJP-T's RDEAD input draws only –70 to –200 µA, minimizing power impact and enabling direct MCU GPIO control if needed.
A4935KJP-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Allegro MicroSystems
- Series:
- -
- Package/Case:
- 48-LQFP Exposed Pad
- Packaging:
- Tray
- Product Status:
- Obsolete
- Motor Type - Stepper:
- -
- Motor Type - AC, DC:
- Brushless DC (BLDC)
- Function:
- Controller - Commutation, Direction Management
- Output Configuration:
- Pre-Driver - Half Bridge (3)
- Interface:
- PWM
- Technology:
- Power MOSFET
- Step Resolution:
- -
- Applications:
- -
- Current - Output:
- -
- Voltage - Supply:
- 3V ~ 5.5V
- Voltage - Load:
- 5.5V ~ 50V
- Operating Temperature:
- -40°C ~ 150°C (TA)
- Grade:
- Automotive
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 48-LQFP-EP (7x7)
A4935KJP-T FAQ
1.How can I place an order for A4935KJP-T through Aetrix?
Please submit a Request for Quotation (RFQ) for A4935KJP-T on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for A4935KJP-T reliable?
The price and inventory of A4935KJP-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for A4935KJP-T is usually 5 days.
3.What payment methods are accepted for A4935KJP-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for A4935KJP-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for A4935KJP-T?
A4935KJP-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your A4935KJP-T order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for A4935KJP-T?
For technical support, including A4935KJP-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your A4935KJP-T requirements.
6.How does Aetrix verify that A4935KJP-T is sourced from the original manufacturer or authorized distributors?
All A4935KJP-T products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that A4935KJP-T meets industry standards.
7.What is the process for return or replacement of A4935KJP-T?
All A4935KJP-T units undergo pre-shipment inspection (PSI). If there is an issue with A4935KJP-T, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The A4935KJP-T part is unused and in its original packaging.
Return procedure for A4935KJP-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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