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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Motor Drivers, Controllers

Allegro MicroSystems A3935KJP-T

Name: A3935KJP-T
Brand: Allegro MicroSystems
SKU: A3935KJP-T
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: A3935KJP-T

Manufacturer:: Allegro MicroSystems

Category:: Motor Drivers, Controllers

Package:: 48-LQFP Exposed Pad

Datasheet:: A3935KJP-T.pdf

Description:: IC MOTOR DRVR 4.75V-5.25V 48LQFP

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Product details

Overview

A3935KJP-T from Allegro MicroSystems is a three-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 - used in electric power steering (EPS) and HVAC blower modules.

For engineers reviewing the A3935KJP-T datasheet, A3935KJP-T pinout, A3935KJP-T application, or A3935KJP-T equivalent, key selection considerations include its 48-pin LQFP package with exposed thermal pad, integrated fault diagnostics (short-to-battery/ground, bridge-open, VBAT over/undervoltage), dead-time control (75–180 ns), and direct TTL-level phase-A/B/C gate control logic.

Technical Context

The A3935KJP-T implements a pulse-frequency modulated (PFM) boost converter to generate stable VBOOST (~16 V) from low-voltage automotive batteries (7–40 V), feeding an internal LDO that supplies regulated VREG (12.7–14 V) for high-side gate driving. Bootstrap capacitors (CA/CB/CC) are charged via VREG when low-side outputs (GLA/GLB/GLC) are active, enabling n-channel MOSFET high-side switching.

It features a dedicated differential current-sense amplifier (CSP/CSN inputs, CSOUT output) with ±200 mV common-mode input range, 1.6 MHz small-signal bandwidth, and 25 mV DC offset error - calibrated for shunt-based motor phase current monitoring. Fault detection includes VDSTH-configurable drain-source voltage monitoring per phase, with independent UVFLT/OVFLT diagnostic outputs and active-low FAULT assertion on thermal shutdown, VDD undervoltage (3.8–4.3 V), or VREG undervoltage (9.9–11.1 V).

Key Specifications

Parameter	Value and Actual Design Meaning
Battery Input Range	7 V to 40 V - supports cold-crank (7 V) and load-dump (40 V) conditions in automotive systems.
VREG Output Voltage	12.7–14 V - LDO-regulated supply for high-side gate drivers; dropout voltage ≤0.9 V at 40 mA.
Gate Drive Capability	GHx source: 400–800 mA (pulsed, TJ = 25–135 °C); GLx sink: 550–850 mA - drives wide-range n-channel MOSFETs.
Current Sense Gain	18.6–19.8 V/V - enables accurate motor phase current measurement using low-value external shunts.
Dead Time	75–180 ns - prevents shoot-through during high-/low-side FET transitions in 3-phase bridge.
Operating Junction Temp	-40 °C to +150 °C - qualified for under-hood automotive environments including EPS and traction inverters.
Fault Detection Thresholds	VBAT overvoltage: 19.4–25.4 V (adjustable via OVSET); short-to-ground/battery thresholds set by VDSTH (0.5–3.0 V).

Pinout & Package

Package: 48-lead low-profile QFP (LQFP) with exposed thermal pad (suffix JP), RoHS-compliant, moisture sensitivity level 3.

Pin/Terminal	Circuit Role	Design Meaning
GHA/GHB/GHC	High-side gate drive outputs	Drive n-channel MOSFET gates; require external bootstrap capacitors (CA/CB/CC) and series gate resistors for dv/dt control.
GLA/GLB/GLC	Low-side gate drive outputs	Sink current to turn on low-side n-channel FETs; referenced to LSS (common low-side source node).
SA/SB/SC	Motor phase terminals	Connect directly to motor windings; serve as negative return for bootstrap capacitors and Kelvin sense points.
CSP/CSN	Differential current sense inputs	Kelvin-connected across low-side shunt resistor; enable accurate phase current measurement despite PCB trace resistance.
VDSTH	Drain-source fault threshold input	Analog voltage (0.5–3.0 V) setting short-circuit detection threshold for high- and low-side MOSFETs.
OVSET	VBAT overvoltage trip point control	DC input (0–2.5 V) scaling VBAT(ov) = 12 × VSET(ov) + 22.4 V - allows programmable overvoltage protection.
FAULT/UVFLT/OVFLT	Diagnostic status outputs	Active-low FAULT asserts on any fault; UVFLT/OVFLT are open-drain, high-impedance when inactive or during thermal/VDD faults.
VBOOST/BOOSTS/BOOSTD	Integrated boost converter interface	BOOSTD/BOOSTS connect external inductor and diode; VBOOST feeds VREG LDO - eliminates need for external boost IC.

Key Features

Feature	Design Value
Integrated PFM boost converter	Generates ~16 V VBOOST from 7–40 V battery - enables robust high-side n-FET drive without external boost IC.
Bootstrap circuitry with CA/CB/CC pins	Supports floating high-side gate drive for all three phases using discrete external capacitors and diodes.
Differential current-sense amplifier	19.2 V/V gain, 1.6 MHz bandwidth, ±25 mV offset error - delivers precise motor phase current feedback for closed-loop control.
Comprehensive fault protection	Detects short-to-battery, short-to-ground, bridge-open, VBAT over/undervoltage, VDD undervoltage, and thermal shutdown - each with dedicated diagnostic outputs.
TTL-compatible logic interface	Direct AHI/ALO, BHI/BLO, CHI/CLO inputs accept 0.8 V / 2.0 V logic thresholds - simplifies connection to MCU GPIO or PWM controllers.

Applications

Electric Power Steering (EPS)	HVAC Blower Motor Control
Use Scenario: High-reliability 3-phase brushless DC motor control in vehicle steering column assemblies, operating continuously under vibration and temperature extremes. IC Role / Device Role / Timing Role: Three-phase gate driver with integrated current sensing and fault reporting - replaces discrete gate driver + boost + sense amp solution. Use Value: Enables compact, thermally efficient EPS module design with single-chip VBAT regulation, real-time phase current monitoring, and ASIL-B-aligned fault diagnostics.	Use Scenario: Variable-speed cabin air circulation system requiring smooth torque delivery and stall protection across 12 V battery voltage range. IC Role / Device Role / Timing Role: Motor phase controller managing commutation timing, current limiting, and overtemperature response in HVAC actuator subsystems. Use Value: Delivers precise airflow control via analog current feedback (CSOUT), while VBAT undervoltage lockout prevents erratic behavior during engine cranking.
Automotive Seat Adjustment Motors	Electric Brake Booster Actuators
Use Scenario: Bidirectional 3-phase motor driving seat position adjustment with soft-start, stall detection, and EMI-controlled slew rate. IC Role / Device Role / Timing Role: Gate driver with programmable dead time (75–180 ns) and external gate resistor support - ensures clean commutation and low EMI emissions. Use Value: Reduces bill-of-materials count by integrating bootstrap, boost, and current sense functions - critical for space-constrained seat control ECUs.	Use Scenario: Safety-critical brake assist system requiring fail-safe shutdown, redundant fault reporting, and operation up to 150 °C junction temperature. IC Role / Device Role / Timing Role: Fault-monitored motor driver with dual diagnostic outputs (FAULT + UVFLT/OVFLT) and thermal shutdown at 160–180 °C. Use Value: Supports functional safety requirements through deterministic fault response, including forced low-side gate disable on VDD undervoltage or thermal events.

Electric Power Steering (EPS)

HVAC Blower Motor Control

Use Scenario: High-reliability 3-phase brushless DC motor control in vehicle steering column assemblies, operating continuously under vibration and temperature extremes.

IC Role / Device Role / Timing Role: Three-phase gate driver with integrated current sensing and fault reporting - replaces discrete gate driver + boost + sense amp solution.

Use Value: Enables compact, thermally efficient EPS module design with single-chip VBAT regulation, real-time phase current monitoring, and ASIL-B-aligned fault diagnostics.

Use Scenario: Variable-speed cabin air circulation system requiring smooth torque delivery and stall protection across 12 V battery voltage range.

IC Role / Device Role / Timing Role: Motor phase controller managing commutation timing, current limiting, and overtemperature response in HVAC actuator subsystems.

Use Value: Delivers precise airflow control via analog current feedback (CSOUT), while VBAT undervoltage lockout prevents erratic behavior during engine cranking.

Automotive Seat Adjustment Motors

Electric Brake Booster Actuators

Use Scenario: Bidirectional 3-phase motor driving seat position adjustment with soft-start, stall detection, and EMI-controlled slew rate.

IC Role / Device Role / Timing Role: Gate driver with programmable dead time (75–180 ns) and external gate resistor support - ensures clean commutation and low EMI emissions.

Use Value: Reduces bill-of-materials count by integrating bootstrap, boost, and current sense functions - critical for space-constrained seat control ECUs.

Use Scenario: Safety-critical brake assist system requiring fail-safe shutdown, redundant fault reporting, and operation up to 150 °C junction temperature.

IC Role / Device Role / Timing Role: Fault-monitored motor driver with dual diagnostic outputs (FAULT + UVFLT/OVFLT) and thermal shutdown at 160–180 °C.

Use Value: Supports functional safety requirements through deterministic fault response, including forced low-side gate disable on VDD undervoltage or thermal events.

Equivalent & Alternatives

The following parts are listed as comparable options for similar three-phase gate driver applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
MP6532GQ-Z (Monolithic Power Systems)	40 V max VBAT, integrated 3-phase gate drivers only - no boost converter or current sense amplifier; requires external VDD supply and shunt amplifier.	Lacks integrated current sensing and PFM boost - suitable for designs with existing 12 V auxiliary rail and separate current monitor IC.	Choose MP6532GQ-Z when board space permits external components and system already provides regulated 12 V for gate drive.
TLE9201SG (Infineon)	Includes embedded 3-phase pre-driver but requires external high-side drivers and external current sense; supports SPI configuration and diagnostics.	Offers programmable parameters via SPI and enhanced CAN-based diagnostics - targets higher ASIL levels but increases software complexity.	Choose TLE9201SG when functional safety certification (ASIL C/D) and configurability outweigh integration benefits of A3935KJP-T.

Compared with MP6532GQ-Z and TLE9201SG, the A3935KJP-T delivers higher integration (on-chip boost, LDO, current sense), simpler hardware design, and deterministic analog fault signaling - making it optimal for cost-sensitive, thermally demanding automotive motor control where minimal external components are prioritized.

Availability

A3935KJP-T is available at Aetrix Electronics and suitable for electric power steering (EPS), HVAC blower control, and seat adjustment motor systems requiring stable component supply across extended temperature and voltage ranges.

Supply support for A3935KJP-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 A3935KJP-T belongs to Allegro's automotive-grade three-phase gate driver product line, engineered specifically for high-reliability motor control in harsh under-hood environments - emphasizing integrated protection, thermal robustness, and simplified system-level design.

FAQ

What is the maximum battery voltage the A3935KJP-T can withstand?

The A3935KJP-T supports absolute maximum VBAT of 40 V, with operational range from 7 V to 40 V. Its integrated PFM boost converter maintains stable VBOOST (~16 V) even during cold-crank (7 V) and load-dump (40 V) transients. The device includes VBAT overvoltage protection adjustable via OVSET, with trip points ranging from 19.4 V to 25.4 V depending on the applied OVSET voltage - ensuring reliable operation across full automotive battery envelope.

Does the A3935KJP-T require external bootstrap diodes?

Yes, the A3935KJP-T requires external bootstrap diodes connected between VREG and each of CA, CB, and CC pins. These diodes charge the bootstrap capacitors when the corresponding low-side gate driver (GLA/GLB/GLC) is active. The datasheet specifies bootstrap diode forward voltage (VDBOOT) and resistance (rDBOOT) limits - typical values are 0.8–2.0 V at 10 mA and 2.5–7.5 Ω - to ensure sufficient gate voltage margin for high-side n-channel MOSFETs during continuous conduction.

How does the A3935KJP-T implement current sensing?

The A3935KJP-T integrates a differential current-sense amplifier with CSP (non-inverting) and CSN (inverting) inputs, delivering a single-ended output on CSOUT. It provides fixed gain of 18.6–19.8 V/V, ±25 mV DC offset error, and 1.6 MHz bandwidth. For accurate measurement, the external shunt resistor must be Kelvin-connected to CSP/CSN, with LSS serving as the low-side reference. The output equation is VCSOUT = (ILOAD × 19.2 × RSHUNT) + VOS, where VOS is calibrated offset voltage - enabling precise real-time phase current feedback in A3935KJP-T-based motor controllers.

What fault conditions cause the FAULT pin to assert low on the A3935KJP-T?

The FAULT pin on the A3935KJP-T goes active low upon detection of any of the following: VBAT overvoltage or undervoltage, VREG undervoltage (9.9–11.1 V), VDD undervoltage (3.8–4.3 V), thermal shutdown (TJ = 160–180 °C), motor lead short-to-ground (when GHx is on), short-to-battery (when GLx is on), or bridge-open (VDRAIN fault). FAULT remains low until all asserted faults clear and internal recovery timers expire - providing unambiguous system-level fault indication without requiring polling or decoding.

Can the A3935KJP-T drive both high-side and low-side n-channel MOSFETs without external level shifters?

Yes, the A3935KJP-T is designed to drive both high-side and low-side n-channel MOSFETs without external level shifters. It uses bootstrap capacitor circuits (CA/CB/CC) charged from VREG to generate gate voltages above the motor phase voltage for high-side FETs. Low-side drivers (GLA/GLB/GLC) reference LSS, eliminating need for isolated supplies. The device specifies GHx high-voltage capability up to 55 V and GLx up to 16 V - supporting standard 12 V/24 V automotive n-FETs with appropriate external gate resistors for controlled dv/dt.

A3935KJP-T Specifications

Product attributes: Attribute value

Manufacturer:: Allegro MicroSystems

Series:: -

Package/Case:: 48-LQFP Exposed Pad

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:: 48-LQFP-EP (7x7)

A3935KJP-T FAQ

1.How can I place an order for A3935KJP-T through Aetrix?

Please submit a Request for Quotation (RFQ) for A3935KJP-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 A3935KJP-T reliable?

The price and inventory of A3935KJP-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for A3935KJP-T is usually 5 days.

3.What payment methods are accepted for A3935KJP-T?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for A3935KJP-T transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for A3935KJP-T?

A3935KJP-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your A3935KJP-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 A3935KJP-T?

For technical support, including A3935KJP-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your A3935KJP-T requirements.

6.How does Aetrix verify that A3935KJP-T is sourced from the original manufacturer or authorized distributors?

All A3935KJP-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 A3935KJP-T meets industry standards.

7.What is the process for return or replacement of A3935KJP-T?

All A3935KJP-T units undergo pre-shipment inspection (PSI). If there is an issue with A3935KJP-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 A3935KJP-T part is unused and in its original packaging.

Return procedure for A3935KJP-T:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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