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Allegro MicroSystems A4939KLPTR-3-T
- Part No.:
- A4939KLPTR-3-T
- Manufacturer:
- Allegro MicroSystems
- Category:
- Motor Drivers, Controllers
- Package:
- 28-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
A4939KLPTR-3-T.pdf
- Description:
- IC MTR DRV MULTI 5.5-50V 28TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,303
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Product details
Overview
A4939KLPTR-3-T from Allegro MicroSystems is a three-phase N-channel MOSFET gate driver IC designed for automotive motor control, delivering regulated 13 V gate drive down to 7 V battery input, integrated crossover protection, and 3.3 V LDO output for external circuitry. It supports electronic power steering (EPS), hydraulic pumps, and engine cooling fans.
For engineers reviewing the A4939KLPTR-3-T datasheet, A4939KLPTR-3-T pinout, A4939KLPTR-3-T application, or A4939KLPTR-3-T equivalent, this page provides verified technical context, validated pin functions, confirmed 3.3 V LDO regulator behavior, real-world fault diagnostics (VDS short detection, overtemperature, undervoltage), and precise package mapping to 28-pin TSSOP with exposed thermal pad (LP).
Technical Context
The A4939KLPTR-3-T implements a charge pump regulator enabling full (>10 V) high-side gate drive at battery voltages ≥7 V and reduced gate drive operation down to 5.5 V. Its six independent TTL-compatible logic inputs (AHI/ALO, BHI/BLO, CHI/CLO) allow arbitrary commutation schemes defined by an external microcontroller.
It integrates per-phase drain-source voltage monitoring using programmable VDSTH threshold (0.2–2.0 V range), open-drain FAULT output signaling short-to-supply/ground, undervoltage, and overtemperature events, and uses bootstrap capacitors (CA/CB/CC to SA/SB/SC) for high-side floating supply generation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBB Range | 5.5 V to 50 V - supports wide automotive battery transients including cold-crank (5.5 V) and load-dump (50 V) |
| VREG Output | 12.5–13.75 V @ 15 mA - powers low-side drivers and charges bootstrap capacitors; regulates down to 5.5 V battery |
| V3 Output | 3.15–3.53 V @ 70 mA - dedicated 3.3 V LDO output for external MCU or sensor biasing; requires ≥1 µF/≤250 mΩ capacitor |
| Gate Drive RDS(on) | High-side pull-up: 5–13 Ω (25°C); low-side pull-down: 1.5–4.6 Ω (25°C) - enables fast switching of low-RDS(on) MOSFETs |
| Fault Detection | VDS short-to-battery/ground per phase, VBB undervoltage, junction overtemperature (170–180°C trip) - all reported via single open-drain FAULT pin |
| Package | 28-pin TSSOP with exposed thermal pad (LP) - Pb-free, matte-tin plating; RθJA = 28°C/W (4-layer PCB) |
| Logic Interface | TTL thresholds (VIL ≤ 0.8 V, VIH ≥ 2.0 V) - compatible with 3.3 V or 5 V microcontrollers without level shifting |
Pinout & Package
28-pin TSSOP with exposed thermal pad (LP package), lead-free, matte-tin plating. Thermal pad must be soldered to PCB ground plane for thermal performance (RθJP = 2°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| LSS | Low-side source return | Common return path for GLA/GLB/GLC outputs; connects to low-side MOSFET sources via low-impedance trace |
| GLC, GLB, GLA | Low-side gate drives (Phases C/B/A) | Drive N-channel MOSFET gates referenced to LSS; support 150 mA sink current at 25°C |
| GHC, GHB, GHA | High-side gate drives (Phases C/B/A) | Floating outputs powered by bootstrap capacitors (CA/CB/CC); deliver >10 V gate drive down to 7 V VBB |
| SC, SB, SA | Motor phase connections | Connect to motor windings; serve as negative terminals for bootstrap capacitors and VDS sensing nodes |
| CC, CB, CA | Bootstrap capacitor connections | Positive terminals for phase-specific bootstrap caps; charged when Sx is pulled low, enable high-side turn-on |
| VREG | Regulated gate drive supply | 13 V nominal output powering low-side drivers and bootstrap charging; stable down to 5.5 V VBB |
| CP1, CP2 | Charge pump capacitor terminals | Interface to external 470 nF pump capacitor enabling boost regulation below 16 V VBB |
| V3 | 3.3 V LDO output | Dedicated 3.3 V supply for external logic; not used internally; requires ≥1 µF ceramic capacitor to GND |
| VBB | Main power supply input | 5.5–50 V battery input powering all internal functions including charge pump and LDO |
| GND | Ground reference | Common analog/digital/power ground; must connect to thermal pad and system ground plane |
| VDSTH | VDS fault threshold programming | Analog input (0.2–2.0 V) setting per-phase short-circuit detection threshold; high-impedance, filterable |
| FAULT | Open-drain diagnostic output | Active-high fault indicator; requires external pull-up (≤5.5 V); asserts on VDS fault, overtemperature, or undervoltage |
| AHI, ALO, BHI, BLO, CHI, CLO | Phase control inputs | TTL-compatible logic inputs defining high/low-side activation per phase; internal lockout prevents shoot-through |
Key Features
| Feature | Design Value |
|---|---|
| Charge pump + buck regulation | Enables full gate drive (>10 V) across 5.5–50 V VBB range without external boost circuitry |
| Per-phase VDS monitoring | Programmable short-to-battery/ground detection per MOSFET using single VDSTH pin and internal comparators |
| Integrated crossover control | Hardware lockout prevents simultaneous high/low-side activation in any phase, eliminating shoot-through risk |
| Dedicated 3.3 V LDO output | On-chip regulator supplies clean 3.3 V (±3.5%) at up to 70 mA for external MCU or sensors; isolated from internal logic |
| Automotive-grade thermal design | RθJA = 28°C/W (4-layer PCB); exposed thermal pad enables reliable operation at TJ ≤ 165°C continuous |
Applications
| Electronic Power Steering (EPS) | Hydraulic Pump Control |
|---|---|
|
Use Scenario: High-reliability 3-phase BLDC motor driving rack-and-pinion assist in passenger vehicles under wide temperature and voltage ranges. IC Role / Device Role / Timing Role: Gate driver providing synchronized high/low-side control, real-time VDS fault detection, and robust gate drive during cold-crank (5.5 V). Use Value: Enables fail-safe torque limiting via FAULT pin assertion on phase short, supporting ASIL-B functional safety requirements. |
Use Scenario: Closed-loop pressure control in electro-hydraulic braking systems requiring precise PWM commutation and thermal resilience. IC Role / Device Role / Timing Role: Three-phase bridge controller interfacing with external MCU; delivers <35 ns turn-on time and matched propagation delay (<10 ns phase-to-phase). Use Value: Reduces external component count with integrated 3.3 V LDO and bootstrap management, simplifying BOM for space-constrained modules. |
| Engine Cooling Fan | Gearbox Actuator |
|
Use Scenario: Variable-speed radiator fan operating across –40°C to 150°C ambient with frequent PWM modulation and battery transients. IC Role / Device Role / Timing Role: Motor phase driver with undervoltage lockout (VREGON = 7.5–8.5 V) and overtemperature warning (170–180°C) for thermal derating. Use Value: Maintains gate drive integrity down to 5.5 V VBB, ensuring fan operation during engine start without brown-out reset. |
Use Scenario: Compact electric actuator for dual-clutch transmission gear selection requiring high-current phase switching and fault logging. IC Role / Device Role / Timing Role: High-side/low-side gate driver with per-phase VDS monitoring and programmable threshold (VDSTH) for adaptive short detection. Use Value: Supports diagnostic traceability via FAULT pin pulse-width encoding (not implemented but enabled by latch-free reporting). |
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 | Integrated 3-phase gate driver with built-in 3.3 V LDO; no programmable VDSTH; lower VBB max (45 V); RDS(on) higher (15 Ω high-side) | Lacks per-phase VDS threshold programming; suited for cost-sensitive non-safety EPS variants without diagnostic logging | Select MP6532GQ-Z only if VDSTH flexibility and 50 V transient tolerance are not required; verify thermal derating at 150°C ambient |
| TLE9183QK | Automotive-qualified 3-phase driver with embedded SPI interface, current sense, and ASIL-D support; no standalone 3.3 V LDO output | Requires external 3.3 V supply; adds complexity but enables closed-loop current control and advanced diagnostics | Choose TLE9183QK when functional safety certification (ISO 26262) and real-time current feedback are mandatory; avoid if LDO integration is critical |
Compared with MP6532GQ-Z and TLE9183QK, the A4939KLPTR-3-T uniquely combines programmable VDS fault detection, 50 V VBB rating, and a dedicated 3.3 V LDO in a compact LP package-making it optimal for EPS and hydraulic pump designs where diagnostic flexibility and supply integration outweigh SPI-based configurability.
Availability
A4939KLPTR-3-T is available at Aetrix Electronics and suitable for electronic power steering (EPS), hydraulic pump control, and engine cooling fan applications requiring stable component supply, automotive qualification, and long-term lifecycle support.
Supply support for A4939KLPTR-3-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 sensing and power IC solutions, serving automotive, industrial, and consumer markets since 1989.
The A4939 product line delivers robust three-phase gate drivers optimized for automotive BLDC motor control, emphasizing fault resilience, wide-input operation, and integrated power management for EPS, pumps, and actuators.
FAQ
What is the function of the VDSTH pin on the A4939KLPTR-3-T?
The VDSTH pin on the A4939KLPTR-3-T sets the drain-source voltage fault threshold for each motor phase. Applying 0.2–2.0 V programs the exact detection level; grounding disables VDS monitoring; pulling above 2.7 V defaults to internal 1.2 V threshold. This enables adaptive short-circuit protection calibrated to specific MOSFET RDS(on) and layout parasitics.
Does the A4939KLPTR-3-T support sleep mode?
No, the A4939KLPTR-3-T does not support sleep mode. Sleep mode is only available on A4939x variants without the LDO regulator (e.g., A4939KLPTR-T). The A4939KLPTR-3-T retains full functionality-including 3.3 V LDO output and gate drive-even when all control inputs are held low.
How does the A4939KLPTR-3-T generate high-side gate voltage?
The A4939KLPTR-3-T uses external bootstrap capacitors (CA/CB/CC) charged via internal diodes when the corresponding motor phase (SA/SB/SC) is pulled low. During high-side turn-on, the capacitor supplies voltage relative to the phase node, enabling >10 V gate drive for N-channel MOSFETs even at 7 V battery input.
What is the purpose of the CP1 and CP2 pins on the A4939KLPTR-3-T?
CP1 and CP2 connect to an external 470 nF pump capacitor that enables the internal charge pump regulator. This circuit boosts VREG to ~13 V when VBB falls below ~16 V, ensuring consistent gate drive strength across the full 5.5–50 V automotive battery range without external boost components.
Can the A4939KLPTR-3-T drive both high-side and low-side N-channel MOSFETs in a 3-phase bridge?
Yes, the A4939KLPTR-3-T is specifically designed to drive six external N-channel MOSFETs-three high-side (via GHC/GHB/GHA) and three low-side (via GLC/GLB/GLA). Integrated crossover control prevents shoot-through, and bootstrap capacitors provide floating high-side supply referenced to each motor phase.
A4939KLPTR-3-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Allegro MicroSystems
- Series:
- -
- Package/Case:
- 28-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Motor Type - Stepper:
- Multiphase
- Motor Type - AC, DC:
- Brushless DC (BLDC)
- Function:
- Controller - Commutation, Direction Management
- Output Configuration:
- Pre-Driver - Half Bridge (3)
- Interface:
- Parallel
- Technology:
- Power MOSFET
- Step Resolution:
- -
- Applications:
- -
- Current - Output:
- -
- Voltage - Supply:
- 5.5V ~ 50V
- Voltage - Load:
- -
- Operating Temperature:
- -40°C ~ 150°C (TA)
- Grade:
- Automotive
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-TSSOP-EP
A4939KLPTR-3-T FAQ
1.How can I place an order for A4939KLPTR-3-T through Aetrix?
Please submit a Request for Quotation (RFQ) for A4939KLPTR-3-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 A4939KLPTR-3-T reliable?
The price and inventory of A4939KLPTR-3-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for A4939KLPTR-3-T is usually 5 days.
3.What payment methods are accepted for A4939KLPTR-3-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for A4939KLPTR-3-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for A4939KLPTR-3-T?
A4939KLPTR-3-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your A4939KLPTR-3-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 A4939KLPTR-3-T?
For technical support, including A4939KLPTR-3-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your A4939KLPTR-3-T requirements.
6.How does Aetrix verify that A4939KLPTR-3-T is sourced from the original manufacturer or authorized distributors?
All A4939KLPTR-3-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 A4939KLPTR-3-T meets industry standards.
7.What is the process for return or replacement of A4939KLPTR-3-T?
All A4939KLPTR-3-T units undergo pre-shipment inspection (PSI). If there is an issue with A4939KLPTR-3-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 A4939KLPTR-3-T part is unused and in its original packaging.
Return procedure for A4939KLPTR-3-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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