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Allegro MicroSystems A4939KLPTR-5-T
- Part No.:
- A4939KLPTR-5-T
- Manufacturer:
- Allegro MicroSystems
- Category:
- Motor Drivers, Controllers
- Package:
- 28-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
A4939KLPTR-5-T.pdf
- Description:
- IC MOTOR DRIVER 5.5V-50V 28TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:11,873
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Product details
Overview
A4939KLPTR-5-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 cross-conduction protection, and 5 V LDO output for external circuitry - deployed in electronic power steering and hydraulic pump systems.
For engineers reviewing the A4939KLPTR-5-T datasheet, A4939KLPTR-5-T pinout, A4939KLPTR-5-T application, or A4939KLPTR-5-T equivalent, this page provides verified functional identity, validated LP-package pin mapping, confirmed 5 V LDO regulator behavior, real-world fault diagnostics (VDS short detection, overtemperature warning), and two field-validated alternative parts with documented technical distinctions.
Technical Context
The A4939KLPTR-5-T implements a charge-pump–based gate drive supply (VREG = 12.5–13.75 V) enabling full N-channel high-side drive at battery voltages as low as 7 V, with fallback operation down to 5.5 V at reduced gate voltage. It uses discrete TTL-level logic inputs (AHI/ALO, BHI/BLO, CHI/CLO) to directly control six independent gate drivers without internal commutation logic.
Each phase includes dedicated bootstrap capacitor terminals (CA/SA, CB/SB, CC/SC), drain-source voltage monitoring via programmable VDSTH pin (0.2–2.0 V threshold range), and independent short-to-supply/short-to-ground detection. Fault reporting is consolidated on a single open-drain FAULT output, with undervoltage lockout on VBB (5.5–50 V range) and V5 output (4.85–5.25 V at ≤70 mA).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBB Supply Range | 5.5 V to 50 V - supports cold-crank automotive operation (down to 5.5 V) while maintaining functional gate drive |
| V5 LDO Output | 4.85–5.25 V at ≤70 mA - powers external microcontrollers or sensors without separate regulator |
| VREG Gate Drive Supply | 12.5–13.75 V typical - ensures >10 V gate-source voltage for robust N-MOSFET turn-on across temperature |
| Bootstrap Diode Current Limit | 250–750 mA - sustains rapid charging of external bootstrap capacitors during PWM switching |
| Turn-On/Off Propagation Delay | 60–180 ns - enables precise timing control for high-frequency BLDC commutation schemes |
| VDS Fault Blank Time | 1.5–4.5 µs - suppresses false short-circuit triggers during MOSFET switching transients |
| Overtemperature Warning Threshold | 170–180 °C junction - initiates FAULT assertion before permanent thermal damage occurs |
Pinout & Package
28-pin TSSOP with exposed thermal pad (LP package), Pb-free, 100% matte-tin leadframe plating - optimized for automotive under-hood thermal dissipation (RθJA = 28 °C/W on 4-layer PCB).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| LSS | Low-side source return | Common return path for GLA/GLB/GLC discharge current; must be low-impedance PCB trace to MOSFET sources |
| GHA, GHB, GHC | High-side gate drives | Source/sink outputs for N-MOSFET gates; require external series resistors to control dv/dt |
| GLA, GLB, GLC | Low-side gate drives | Source/sink outputs referenced to LSS; drive lower half of 3-phase bridge |
| SA, SB, SC | Motor phase connections | Bridge output nodes; also serve as bootstrap capacitor negative terminals and VDS sense points |
| CA, CB, CC | Bootstrap capacitor positive | Connect to bootstrap caps (e.g., 100 nF X7R) - charged when respective Sx is low |
| VREG | Regulated gate drive supply | 13 V nominal output powering low-side drivers and bootstrap cap charging; requires ≥10 µF bulk capacitance |
| CP1, CP2 | Charge pump capacitor terminals | Interface to external 470 nF pump cap; enables VREG regulation below 16 V VBB |
| V5 | 5 V LDO output | Dedicated 5 V supply for external logic; disabled if VBB < 6 V or V5 load exceeds 70 mA |
| VDSTH | VDS fault threshold programming | Analog input (0.2–2.0 V) setting short-circuit detection level per phase; high-impedance (±3 µA leakage) |
| FAULT | Open-drain fault indicator | Active-high signal pulled externally to ≤5.5 V; asserts on VBB UVLO, overtemperature, or VDS fault |
| AHI–CLO | Logic control inputs | Six TTL-compatible inputs (VIH ≥ 2.0 V, VIL ≤ 0.8 V); each pair controls one phase's high/low side |
| VBB | Main power supply | Input for entire device including LDO, charge pump, and logic; requires reverse-voltage protection and local ceramic decoupling |
Key Features
| Feature | Design Value |
|---|---|
| Three-phase N-MOSFET gate drive | Independent high/low-side outputs per phase enable flexible commutation schemes (six-step, sinusoidal) controlled externally |
| Integrated crossover control | Hardware lockout prevents simultaneous high/low-side activation - eliminates shoot-through risk without software coordination |
| Programmable VDS short detection | Voltage threshold set via VDSTH pin (0.2–2.0 V range) with ±100 mV offset tolerance - adapts to MOSFET RDS(on) and layout parasitics |
| 5 V LDO regulator | Stable 5 V output (4.85–5.25 V) with 130–260 mA overcurrent limit - eliminates need for external 5 V rail in EPS/EHPS modules |
| Automotive-grade thermal protection | Overtemperature warning at 170–180 °C with 15 °C hysteresis - allows system-level thermal management before shutdown |
Applications
| Electronic Power Steering (EPS) | Hydraulic Pump Control |
|---|---|
Use Scenario: High-reliability 3-phase BLDC motor driving rack-and-pinion assist mechanism in 12 V vehicle electrical systems. IC Role / Device Role / Timing Role: Gate driver providing synchronized high/low-side control with VDS fault monitoring to prevent MOSFET failure during torque spikes. Use Value: Enables fail-safe motor cutoff within 2.3 µs blanking window upon short-circuit detection - meets ISO 26262 ASIL-B requirements. |
Use Scenario: Closed-loop pressure control in engine-mounted hydraulic pumps using sensorless BLDC commutation. IC Role / Device Role / Timing Role: Three-phase driver interfacing with external MCU; V5 output powers pump position sensor and ADC reference. Use Value: 5 V LDO eliminates discrete regulator, reducing BOM count and PCB area while maintaining ±2.5% output accuracy under 70 mA load. |
| Engine Cooling Fan | Gearbox Actuator |
Use Scenario: Variable-speed radiator fan operating across wide battery range (6–16 V) including cold-crank conditions. IC Role / Device Role / Timing Role: Gate driver sustaining >10 V gate drive down to 7 V VBB via charge pump; operates functionally at 5.5 V with reduced drive. Use Value: Maintains fan speed control during 5.5 V cranking events - avoids thermal runaway by preventing fan stall. |
Use Scenario: Precision actuation of dual-clutch transmission shift solenoids requiring fast, bidirectional motor control. IC Role / Device Role / Timing Role: Driver executing six-step commutation with programmable VDS thresholds to detect winding shorts in compact gearbox housing. Use Value: Per-phase VDS monitoring isolates faults to single coil - enables diagnostic logging without full system shutdown. |
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 |
|---|---|---|---|
| MP6539GQ-Z | Integrated 3.3 V LDO (not 5 V); no VDSTH programmability; fixed 1.2 V VDS threshold | Lacks adjustable short-circuit sensitivity - less suitable for variable-RDS(on) MOSFETs or high-parasitic layouts | Select when 3.3 V bias is sufficient and fixed fault threshold meets design margin |
| TLE9183QK | Includes embedded SPI interface and diagnostics; higher quiescent current (25 mA vs. 10 mA); QFN-only packaging | Requires MCU firmware integration for configuration; not drop-in compatible due to SPI dependency and pinout mismatch | Select when advanced diagnostics (e.g., gate voltage monitoring) and ASIL-D compliance are required |
Compared with MP6539GQ-Z and TLE9183QK, the A4939KLPTR-5-T offers unique 5 V LDO output, analog-programmable VDS threshold, and TSSOP-LP packaging - making it optimal for cost-sensitive, space-constrained EPS modules needing flexible fault tuning and legacy PCB compatibility.
Availability
A4939KLPTR-5-T is available at Aetrix Electronics and suitable for electronic power steering, hydraulic pump control, and engine cooling fan applications requiring stable component supply across automotive production lifecycles.
Supply support for A4939KLPTR-5-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 ICs, specializing in automotive-grade motion control and energy-efficient power management solutions.
The A4939 product line delivers robust three-phase gate driving for N-channel MOSFETs in safety-critical automotive subsystems - engineered specifically for EPS, EHPS, and actuator applications demanding extended temperature operation and fault resilience.
FAQ
What is the function of the V5 pin on the A4939KLPTR-5-T?
The V5 pin on the A4939KLPTR-5-T is a dedicated 5 V low-dropout regulator output, delivering 4.85–5.25 V at up to 70 mA to power external circuitry such as microcontrollers or sensors. It is active only when VBB exceeds 6 V and shuts down with 2 ms lockout if output voltage falls below 450–850 mV. This eliminates the need for an external 5 V regulator in EPS modules.
Does the A4939KLPTR-5-T support sleep mode?
No, the A4939KLPTR-5-T does not support sleep mode. Sleep mode is only available on A4939 variants without an LDO regulator (e.g., A4939KLPTR-T). The A4939KLPTR-5-T retains full functionality with all gate drivers operational even when all logic inputs are held low - power consumption remains at typical 10 mA quiescent current.
How is short-circuit protection implemented in the A4939KLPTR-5-T?
The A4939KLPTR-5-T implements per-phase short-circuit protection using drain-source voltage monitoring. The VDSTH pin accepts an external analog voltage (0.2–2.0 V) to set the detection threshold. When VDS exceeds this level plus ±100 mV offset, a fault is flagged after a 1.5–4.5 µs blanking window. All gate drivers are disabled and the open-drain FAULT pin asserts high.
What package type does the A4939KLPTR-5-T use?
The A4939KLPTR-5-T uses a 28-pin TSSOP package with exposed thermal pad (LP package), measuring 9.7 mm × 4.4 mm × 1.2 mm. It is Pb-free with 100% matte-tin leadframe plating and achieves 28 °C/W junction-to-ambient thermal resistance on a 4-layer JEDEC-standard PCB - optimized for under-hood automotive thermal environments.
Can the A4939KLPTR-5-T drive both high-side and low-side N-channel MOSFETs?
Yes, the A4939KLPTR-5-T drives six N-channel MOSFETs - three high-side (GHA/GHB/GHC) and three low-side (GLA/GLB/GLC) - using bootstrap capacitors (CA/SA, CB/SB, CC/SC) for high-side floating supply. Its charge pump maintains >10 V gate drive down to 7 V VBB, and functional operation continues down to 5.5 V with reduced gate voltage - essential for automotive cold-crank robustness.
A4939KLPTR-5-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:
- -
- 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-5-T FAQ
1.How can I place an order for A4939KLPTR-5-T through Aetrix?
Please submit a Request for Quotation (RFQ) for A4939KLPTR-5-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-5-T reliable?
The price and inventory of A4939KLPTR-5-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-5-T is usually 5 days.
3.What payment methods are accepted for A4939KLPTR-5-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for A4939KLPTR-5-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for A4939KLPTR-5-T?
A4939KLPTR-5-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your A4939KLPTR-5-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-5-T?
For technical support, including A4939KLPTR-5-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your A4939KLPTR-5-T requirements.
6.How does Aetrix verify that A4939KLPTR-5-T is sourced from the original manufacturer or authorized distributors?
All A4939KLPTR-5-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-5-T meets industry standards.
7.What is the process for return or replacement of A4939KLPTR-5-T?
All A4939KLPTR-5-T units undergo pre-shipment inspection (PSI). If there is an issue with A4939KLPTR-5-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-5-T part is unused and in its original packaging.
Return procedure for A4939KLPTR-5-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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