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Allegro MicroSystems A89506KESSR-J
- Part No.:
- A89506KESSR-J
- Manufacturer:
- Allegro MicroSystems
- Category:
- Gate Drivers
- Package:
- 20-WFQFN Exposed Pad
- Datasheet:
-
A89506KESSR-J.pdf
- Description:
- IC GATE DRVR FULL-BRIDGE 20QFN
- Quantity:
- Payment:
- Shipping:
Inventory:10,740
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Product details
Overview
A89506KESSR-J from Allegro MicroSystems is a full-bridge PWM gate driver IC designed to control all-N-channel external MOSFET H-bridges for DC motor applications. It operates up to 50 V, integrates synchronous rectification, adjustable off-time/blank-time/current limit/gate drive, and provides VDS protection, thermal shutdown with hysteresis, UVLO, and crossover-current protection - enabling robust motor control in automotive-grade systems.
For engineers reviewing the A89506KESSR-J datasheet, A89506KESSR-J pinout, A89506KESSR-J application, or A89506KESSR-J equivalent, this device supports PHASE/ENABLE/MODE logic, delivers analog current-sense output (AIOUT), features AEC-Q100 qualification, and requires careful attention to RC timing network selection for decay mode and fault blanking.
Technical Context
The A89506KESSR-J implements fixed off-time PWM current regulation using an external sense resistor and VREF input, with peak current calculated as IPEAK = VREF/(10 × RSENSE). Its internal charge pump generates gate voltage above VBB for high-side N-MOSFET drive, while synchronous rectification reduces conduction losses during slow-decay operation.
Control logic supports three decay modes (slow, fast, mixed) selected via MODE pin, with mixed-decay defaulting to 13% fast-decay portion of tOFF. Fault handling includes latched VDS overvoltage detection (VDSTH = 1 V), OCLn open-drain flag with 300–650 µs timeout, and AIOUT-based current monitoring with 10× gain and sample-and-hold circuitry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBB Max | 50 V - supports 48 V automotive battery systems with headroom for load dump transients |
| Operating Temp | –40°C to +135°C - qualified for under-hood automotive environments (K grade) |
| Gate Drive Voltage | 6.5–7.5 V (typ) - sufficient to fully enhance standard N-channel MOSFETs at VBB ≥ 8 V |
| Fixed Off-Time | Adjustable 30 µs (typ) - sets PWM chopping frequency and peak current regulation window |
| Blank-Time | 2.1–3.9 µs - blanks current-sense comparator during switching transitions to prevent false OCP |
| VDS Threshold | 1 V - detects MOSFET overvoltage faults before destructive avalanche occurs |
| Thermal Shutdown | 165–185°C with 15°C hysteresis - prevents thermal runaway while allowing recovery without power cycle |
Pinout & Package
Package: 4 mm × 4 mm, 20-contact QFN with exposed thermal pad (ES suffix); RoHS-compliant, moisture-sensitive level 3.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| ISET | Gate drive current setting | Resistor-to-ground sets pull-up (21–39 mA) and pull-down (47–89 mA) gate currents in ~2:1 ratio |
| MODE | Decay mode select | Logic high enables slow-decay braking; low enables fast-decay or mixed-decay per ENABLE state |
| SENSE | Current sense return | Connects to low-side shunt resistor; referenced to GND for bidirectional current sensing |
| GLA/GLB/GHA/GHB | Gate drivers | Four independent outputs driving external N-MOSFET gates; GLx = low-side, GHx = high-side |
| SB/SA | High-side bridge references | Provide local return paths for high-side gate drivers; must be connected to respective MOSFET sources |
| VCP/CP1/CP2 | Charge pump terminals | VCP is reservoir node; CP1/CP2 form flying capacitor network to generate >VBB gate voltage |
| OCLn | Open-drain fault flag | Asserts low on VDS fault or current limit event; requires external pull-up for system-level interrupt |
| AIOUT | Analog current monitor | 10× amplified SENSE voltage with sample-and-hold; droops ≤1 mV/µs when held |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous rectification | Reduces power dissipation by enabling complementary low-side FET conduction during slow-decay periods |
| Adjustable gate drive strength | ISET resistor tunes both high- and low-side gate currents independently to match MOSFET Qg and minimize switching loss |
| Mixed-decay PWM control | Automatically combines 13% fast-decay and 87% slow-decay within each off-time to balance torque ripple and efficiency |
| VDS fault protection with blanking | VDS monitor disabled for programmable duration post-switching (via RC network) to avoid false trips from Miller-induced spikes |
| AEC-Q100 Grade 0 qualification | Validated for automotive applications requiring operation up to +150°C junction temperature |
Applications
| Electric Power Steering (EPS) | Automotive HVAC Blower |
|---|---|
Use Scenario: Precise bidirectional torque control of brushless DC motor in steering assist module under varying road loads and battery voltages. IC Role / Device Role / Timing Role: Full-bridge gate driver managing external N-MOSFETs; regulates motor current via fixed off-time PWM and provides real-time AIOUT feedback for closed-loop torque control. Use Value: Enables smooth, responsive steering assist with <135°C ambient operation, VDS fault detection preventing MOSFET failure during stall events, and synchronous rectification improving system efficiency by >15% at partial load. | Use Scenario: Variable-speed control of centrifugal blower motor in climate control system across wide temperature range and supply voltage fluctuations. IC Role / Device Role / Timing Role: PWM gate driver implementing mixed-decay current regulation; MODE pin configures brake behavior during rapid speed reduction. Use Value: Delivers stable airflow control down to 10% duty cycle with minimal audible noise, leveraging blank-time adjustment to suppress EMI from diode reverse recovery, and thermal shutdown protecting against duct blockage scenarios. |
| Seat Motor Actuation | Auto-Focus Camera Module |
Use Scenario: Position-controlled movement of automotive seat motors with end-stop detection and stall protection. IC Role / Device Role / Timing Role: Full-bridge driver executing forward/reverse commands via PHASE/ENABLE; uses OCLn flag and AIOUT to detect mechanical jam and trigger safe shutdown. Use Value: Prevents motor burnout and gear damage by latching off on VDS fault during stalling, while AIOUT's 10× gain enables accurate current thresholding at <100 mV sense voltage - reducing PCB space vs. discrete amplifiers. | Use Scenario: Micro-precision lens positioning in compact camera modules requiring ultra-low EMI and minimal heat generation. IC Role / Device Role / Timing Role: Gate driver operating external MOSFETs in low-duty-cycle PWM mode; leverages standby mode (1 µA typical) between focus adjustments. Use Value: Achieves <10 µA quiescent current in standby, eliminates need for external enable sequencing, and maintains position accuracy via sample-and-hold AIOUT that holds sensed current during PWM off-time without droop exceeding 15 mV. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar full-bridge gate driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP6550GQ-Z | Integrated MOSFETs (40 V, 5 A), no external FET support; lacks VDS monitoring and AIOUT | Targeted at lower-power, space-constrained applications where integrated FETs suffice | Select MP6550GQ-Z only if motor current ≤5 A and VDS fault detection is not required |
| TB9057FG | AEC-Q100 Grade 1 (–40°C to +125°C), includes CAN interface and built-in current DAC; higher BOM cost | Designed for centralized body control modules requiring communication and diagnostics | Choose TB9057FG when CAN bus integration and diagnostic reporting are mandatory, not for standalone motor drive |
Compared with MP6550GQ-Z and TB9057FG, the A89506KESSR-J uniquely balances external FET flexibility, comprehensive fault coverage (VDS + thermal + UVLO + OCP), and analog current monitoring in a compact QFN - making it optimal for mid-power automotive actuators where reliability and design margin are critical.
Availability
A89506KESSR-J is available at Aetrix Electronics and suitable for electric power steering, HVAC blower control, and seat actuation systems requiring stable component supply, AEC-Q100 compliance, and long-term automotive lifecycle support.
Supply support for A89506KESSR-J 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 A89506 product line delivers high-voltage, high-reliability gate drivers for N-channel H-bridges - engineered specifically for demanding automotive motion control applications including EPS, cooling fans, and precision actuators.
FAQ
What is the maximum continuous VBB voltage rating for the A89506KESSR-J?
The A89506KESSR-J has an absolute maximum VBB rating of 50 V, with recommended operating range from 5.5 V to 50 V. This allows direct connection to 48 V battery systems while maintaining margin for transient overvoltages. Operation beyond 50 V risks permanent damage to internal charge pump and gate drivers. The A89506KESSR-J datasheet specifies VBB(UVLO) thresholds between 5.05 V and 5.50 V, confirming robust low-voltage immunity.
How does the A89506KESSR-J implement synchronous rectification and what benefit does it provide?
The A89506KESSR-J implements synchronous rectification by actively turning on the complementary low-side MOSFET during slow-decay periods instead of relying on body diode conduction. This reduces power dissipation by lowering voltage drop across the conducting path from ~0.7 V (diode) to ~0.05 V (MOSFET RDS(on)). In typical 12 V, 10 A motor applications, this improves efficiency by 15–20% and reduces thermal stress on external FETs - a key advantage of the A89506KESSR-J over non-SR gate drivers.
What is the function of the RC pin on the A89506KESSR-J and how does it affect operation?
The RC pin on the A89506KESSR-J sets both fixed off-time (tOFF) and blank-time (tBLK) using an external resistor-capacitor network. With RRC = 30 kΩ and CRC = 1 nF, tOFF is typically 30 µs and tBLK is 3 µs. These values directly determine PWM chopping frequency, current regulation accuracy, and immunity to switching noise. Incorrect RC values cause unstable current limiting or false overcurrent faults - a critical tuning parameter unique to the A89506KESSR-J's architecture.
Does the A89506KESSR-J support brake functionality and how is it implemented?
Yes, the A89506KESSR-J supports braking via slow-decay mode (MODE = high, ENABLE low), where the low-side FET remains on to dissipate motor energy through the winding resistance. However, internal PWM current limiting is disabled during braking since current bypasses the sense resistor. Maximum brake current must be limited externally by motor BEMF and winding resistance. The A89506KESSR-J provides OCLn flagging and AIOUT monitoring to detect abnormal conditions but does not regulate brake current - users must ensure external MOSFET SOA compliance.
What package type and thermal characteristics apply to the A89506KESSR-J?
The A89506KESSR-J uses a 4 mm × 4 mm, 20-contact QFN package with exposed thermal pad (ES suffix). Its thermal resistance is RθJA = 37°C/W on a 4-layer PCB with 1 in² copper area. The exposed pad must be soldered to a thermal plane with ≥6 vias (0.3 mm diameter) for effective heat transfer. This package enables compact layout while supporting 135°C ambient operation - a defining feature of the A89506KESSR-J versus smaller-outline alternatives.
A89506KESSR-J Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Allegro MicroSystems
- Series:
- -
- Package/Case:
- 20-WFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Driven Configuration:
- Full-Bridge
- Channel Type:
- Synchronous
- Number of Drivers:
- 4
- Gate Type:
- N-Channel MOSFET
- Voltage - Supply:
- -
- Logic Voltage - VIL, VIH:
- 0.8V, 2V
- Current - Peak Output (Source, Sink):
- -
- Input Type:
- Non-Inverting
- High Side Voltage - Max (Bootstrap):
- -
- Rise / Fall Time (Typ):
- -
- Operating Temperature:
- -40°C ~ 135°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-QFN-EP (4x4)
A89506KESSR-J FAQ
1.How can I place an order for A89506KESSR-J through Aetrix?
Please submit a Request for Quotation (RFQ) for A89506KESSR-J 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 A89506KESSR-J reliable?
The price and inventory of A89506KESSR-J are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for A89506KESSR-J is usually 5 days.
3.What payment methods are accepted for A89506KESSR-J?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for A89506KESSR-J transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for A89506KESSR-J?
A89506KESSR-J orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your A89506KESSR-J 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 A89506KESSR-J?
For technical support, including A89506KESSR-J datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your A89506KESSR-J requirements.
6.How does Aetrix verify that A89506KESSR-J is sourced from the original manufacturer or authorized distributors?
All A89506KESSR-J 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 A89506KESSR-J meets industry standards.
7.What is the process for return or replacement of A89506KESSR-J?
All A89506KESSR-J units undergo pre-shipment inspection (PSI). If there is an issue with A89506KESSR-J, 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 A89506KESSR-J part is unused and in its original packaging.
Return procedure for A89506KESSR-J:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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