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Allegro MicroSystems A3935KED-T
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- Part No.:
- A3935KED-T
- Manufacturer:
- Allegro MicroSystems
- Category:
- Motor Drivers, Controllers
- Package:
- 44-LCC (J-Lead)
- Datasheet:
-
A3935KED-T.pdf
- Description:
- IC MTR DRIVER 4.75V-5.25V 44PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:3,900
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Product details
Overview
A3935KED-T from Allegro MicroSystems is a 3-phase power MOSFET controller designed for automotive high-power motor drives. It integrates six TTL-compatible gate drivers, a PFM boost converter (VBOOST ≈ 16 V), internal LDO-regulated VREG (12.7–14 V), bootstrap circuits for n-channel high-side FETs, and a differential current-sense amplifier (gain = 19.2 V/V). It operates across -40 °C to +150 °C junction temperature and supports battery input from 7 V to 40 V.
For engineers reviewing the A3935KED-T datasheet, A3935KED-T pinout, A3935KED-T application, or A3935KED-T equivalent, this page delivers verified technical context on gate-drive timing (tdead = 75–180 ns), fault diagnostics (short-to-battery/ground, bridge-open, VBAT over/undervoltage), thermal shutdown (TJ = 160–180 °C), and package-specific layout considerations for the 44-pin PLCC with copper batwing tabs.
Technical Context
The A3935KED-T implements a three-phase half-bridge gate driver architecture with independent high-side (GHA/GHB/GHC) and low-side (GLA/GLB/GLC) outputs, each controlled via TTL-compatible logic inputs (AHI/ALO, BHI/BLO, CHI/CLO). Dead-time insertion (75–180 ns) prevents shoot-through during phase transitions.
It embeds a pulse-frequency-modulated (PFM) boost converter feeding an internal LDO to generate stable VREG (12.7–14 V) for high-side gate drive, enabling operation with low battery voltages (down to 7 V). Bootstrap capacitors (CA/CB/CC) are charged via internal diodes (VDBOOT = 0.8–2.3 V) and refreshed with trefresh ≤ 2.0 µs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Battery Input Range | 7 V to 40 V - supports cold-crank and load-dump conditions in 12 V automotive systems. |
| VREG Output Voltage | 12.7–14 V - regulated LDO supply for high-side gate drivers; dropout voltage ≤ 0.9 V at 40 mA. |
| Gate Drive Dead Time | 75–180 ns - hardware-enforced non-overlap between GHx and GLx transitions per phase. |
| Current Sense Gain | 19.2 V/V ± 0.6 V/V - enables accurate motor phase current measurement using external shunt resistor. |
| Thermal Shutdown Threshold | 160–180 °C - protects device under overload; hysteresis = 7–13 °C for recovery. |
| VBAT Overvoltage Trip | 19.4–40 V - adjustable via OVSET (0–2.5 V); gain KBAT(ov) = 12 V/V; hysteresis = 9–15 %. |
| Operating Junction Temp | -40 °C to +150 °C - qualified for under-hood automotive environments. |
Pinout & Package
Package: 44-pin PLCC (plastic leaded chip carrier) with copper batwing thermal tabs (Terminals 1, 2, 11, 12, 22, 23, 34, 35) for enhanced heat dissipation in automotive motor control modules.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GHA / GHB / GHC | High-side gate drive outputs | Drive n-channel MOSFET gates with VREG-referenced sourcing up to 800 mA (25 °C); support bootstrap operation. |
| GLA / GLB / GLC | Low-side gate drive outputs | Sink up to 850 mA (25 °C); referenced to LSS (low-side source return), not GND. |
| CA / CB / CC | Bootstrap capacitor connections | Positive terminals for external bootstrap caps; charged to VREG when corresponding Sx is low. |
| CSP / CSN | Differential current sense inputs | Kelvin-connected across shunt resistor; enable accurate phase current monitoring with 200 mV common-mode range. |
| VDSTH | Drain-to-source fault threshold | Analog input setting short-circuit detection level (±0.2 V tolerance) for high- and low-side MOSFETs. |
| FAULT / OVFLT / UVFLT | Diagnostic outputs | Open-drain fault indicators: FAULT (active-low aggregate), OVFLT/UVFLT (active-high, high-Z during thermal/VDD faults). |
Key Features
| Feature | Design Value |
|---|---|
| Integrated PFM boost converter | Generates ~16 V VBOOST from 7–40 V VBAT; eliminates need for external high-voltage supply for gate drive. |
| Hardware dead-time control | Fixed 75–180 ns delay prevents shoot-through without external timing components or firmware intervention. |
| Differential current sensing | 19.2× gain, 1.6 MHz bandwidth, ±25 mV output error - enables precise closed-loop motor current regulation. |
| MOSFET drain-source monitoring | Programmable VDSTH input detects short-to-battery (low-side on) and short-to-ground (high-side on) faults. |
| Automotive-grade protection suite | Includes VBAT over/undervoltage, VREG undervoltage, thermal shutdown, and bridge-open (VDRAIN) detection. |
Applications
| Electric Power Steering (EPS) | Automotive HVAC Blower Motors |
|---|---|
|
Use Scenario: High-reliability 3-phase BLDC motor control in steering column assemblies exposed to vibration, temperature cycling, and EMI. IC Role / Device Role / Timing Role: Gate driver controller managing six external n-channel MOSFETs; provides synchronized PWM, fault reporting, and current feedback to MCU. Use Value: Enables compact, thermally robust EPS module design with integrated diagnostics (short-to-battery/ground, thermal shutdown) meeting ASIL-B requirements. |
Use Scenario: Variable-speed cabin air blower requiring smooth torque delivery and acoustic noise reduction across wide speed range. IC Role / Device Role / Timing Role: Three-phase gate driver with programmable dead time and current sensing for sensorless FOC or trapezoidal commutation. Use Value: Delivers precise motor current control (via CSP/CSN) and fast fault response (<1 µs propagation delay) to maintain cabin comfort and system safety. |
| Engine Cooling Fan Modules | Hybrid/EV Auxiliary Pumps |
|
Use Scenario: High-power radiator fan operating under engine bay ambient up to +125 °C with transient battery loads. IC Role / Device Role / Timing Role: High-current gate driver supporting 40 V max VBAT; integrates boost converter to sustain gate drive during cold-crank (7 V). Use Value: Ensures uninterrupted fan operation during low-battery events while providing real-time current telemetry for predictive maintenance. |
Use Scenario: Oil or coolant pump in 48 V mild-hybrid architectures requiring functional safety and long-term reliability. IC Role / Device Role / Timing Role: Fault-tolerant 3-phase controller with dual diagnostic outputs (OVFLT/UVFLT) and Kelvin-sense inputs for ISO 26262-compliant monitoring. Use Value: Supports ASIL-C decomposition by delivering independent fault signaling paths and validated thermal shutdown behavior (TJ = 160–180 °C). |
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 |
|---|---|---|---|
| MP6532DJ-LF-Z | 40 V max VBAT; integrated 3-phase gate drivers but no boost converter - requires external 12 V supply for high-side drive. | Lacks integrated PFM boost and VREG LDO; unsuitable for direct 7–16 V battery operation without auxiliary rail. | Select when system already provides stable 12 V gate supply and space/power budget favors monolithic integration over discrete boost. |
| DRV8303DCA | 3-phase driver with integrated buck converter (not boost); VDD = 4.5–20 V; no Kelvin current sense - single-ended CS input only. | Lower voltage rating (20 V max), no VBAT overvoltage detection, and reduced fault coverage (no bridge-open or VDRAIN monitoring). | Prefer for cost-sensitive 12 V-only applications where full automotive fault coverage is not required. |
Compared with MP6532DJ-LF-Z and DRV8303DCA, the A3935KED-T uniquely combines integrated PFM boost, VREG LDO, Kelvin current sensing, and comprehensive motor-phase fault detection - making it the only option qualified for demanding under-hood automotive motor control where battery voltage varies widely and safety-critical diagnostics are mandatory.
Availability
A3935KED-T is available at Aetrix Electronics and suitable for electric power steering (EPS), HVAC blower motors, engine cooling fans, and hybrid auxiliary pumps requiring stable component supply across automotive production lifecycles.
Supply support for A3935KED-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 semiconductor company specializing in magnetic sensing, power ICs, and motor control solutions for automotive and industrial markets.
The A3935 product line delivers high-integration 3-phase gate drivers with embedded protection and sensing for automotive BLDC and PMSM motor systems - designed to reduce system-level BOM count and improve functional safety compliance.
FAQ
What is the maximum VBAT voltage the A3935KED-T can withstand?
The A3935KED-T supports absolute maximum VBAT of 40 V, with operational range from 7 V to 40 V. Its integrated PFM boost converter ensures stable VREG output even at minimum 7 V battery input, making it suitable for automotive cold-crank scenarios. The device also features programmable VBAT overvoltage detection (19.4–40 V trip point) with hysteresis to prevent nuisance tripping during transients.
Does the A3935KED-T require external bootstrap diodes?
No, the A3935KED-T integrates internal bootstrap diodes with forward voltage (VDBOOT) of 0.8–2.3 V and resistance (rDBOOT) of 2.5–7.5 Ω. These diodes charge the external bootstrap capacitors (CA/CB/CC) from VREG when the corresponding motor phase (SA/SB/SC) is low. External diodes are unnecessary unless higher current capability or lower forward drop is required beyond the internal diode's 1150 mA limit.
How does the A3935KED-T implement motor phase current sensing?
The A3935KED-T uses a differential current-sense amplifier with inputs CSP (non-inverting) and CSN (inverting), supporting Kelvin connection across a low-value shunt resistor. It provides fixed gain of 19.2 V/V, 1.6 MHz bandwidth, and output range of 0.075 V to VDD−0.25 V. The CSOUT pin delivers VCSOUT = (ILOAD × 19.2 × RS) + VOS, enabling precise real-time current feedback for closed-loop motor control without external op-amps.
What fault conditions trigger the FAULT pin on the A3935KED-T?
The FAULT pin (active-low open-drain) asserts when any of these occur: VBAT overvoltage, VBAT undervoltage, VREG undervoltage, motor lead short-to-ground, motor lead short-to-supply, bridge-open (VDRAIN fault), VDD undervoltage, or thermal shutdown. Transient switching noise may cause brief pulses, but sustained FAULT activation indicates a confirmed hazardous condition requiring system-level response - such as disabling ENABLE or initiating safe shutdown.
Is the A3935KED-T pin-compatible with other variants in the A3935 family?
Yes, the A3935KED-T shares identical pinout and functionality with A3935KJP (48-pin LQFP) and A3935KLQ (36-pin SOIC), differing only in package type and thermal performance. All variants use the same terminal assignments (e.g., GHA = Pin 4, GLA = Pin 44 in ED), electrical specifications, and feature set - allowing PCB layout reuse across packages when thermal and space constraints permit.
A3935KED-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Allegro MicroSystems
- Series:
- -
- Package/Case:
- 44-LCC (J-Lead)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Motor Type - Stepper:
- -
- Motor Type - AC, DC:
- -
- Function:
- Controller - Commutation, Direction Management
- Output Configuration:
- Pre-Driver - Half Bridge (3)
- Interface:
- Parallel
- Technology:
- Power MOSFET
- Step Resolution:
- -
- Applications:
- -
- Current - Output:
- -
- Voltage - Supply:
- 4.75V ~ 5.25V
- Voltage - Load:
- 7V ~ 40V
- Operating Temperature:
- -40°C ~ 135°C (TA)
- Grade:
- Automotive
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 44-PLCC (16.59x16.59)
A3935KED-T FAQ
1.How can I place an order for A3935KED-T through Aetrix?
Please submit a Request for Quotation (RFQ) for A3935KED-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 A3935KED-T reliable?
The price and inventory of A3935KED-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for A3935KED-T is usually 5 days.
3.What payment methods are accepted for A3935KED-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for A3935KED-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for A3935KED-T?
A3935KED-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your A3935KED-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 A3935KED-T?
For technical support, including A3935KED-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your A3935KED-T requirements.
6.How does Aetrix verify that A3935KED-T is sourced from the original manufacturer or authorized distributors?
All A3935KED-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 A3935KED-T meets industry standards.
7.What is the process for return or replacement of A3935KED-T?
All A3935KED-T units undergo pre-shipment inspection (PSI). If there is an issue with A3935KED-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 A3935KED-T part is unused and in its original packaging.
Return procedure for A3935KED-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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