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Allegro MicroSystems A3922KLPTR-T
- Part No.:
- A3922KLPTR-T
- Manufacturer:
- Allegro MicroSystems
- Category:
- Motor Drivers, Controllers
- Package:
- 28-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
A3922KLPTR-T.pdf
- Description:
- IC MOTOR DRVR 5.5V-50V 28ETSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:6,627
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Product details
Overview
A3922KLPTR-T from Allegro MicroSystems is an automotive-grade N-channel full-bridge (H-bridge) MOSFET pre-driver IC designed to control high-power inductive loads such as brushed DC motors, solenoids, and actuators. It operates from 5.5 V to 50 V supply, integrates a programmable charge pump for gate drive down to 7 V battery input, supports SPI-compatible serial interface and direct logic control, and delivers ASIL D–compliant diagnostics for safety-critical vehicle systems.
For engineers reviewing the A3922KLPTR-T datasheet, A3922KLPTR-T pinout, A3922KLPTR-T application, or A3922KLPTR-T equivalent, key selection considerations include its 28-pin eTSSOP package with exposed thermal pad, programmable dead time (1.25–2.15 µs), integrated current sense amplifier (35 V/V gain, ±1 mV offset), and dual-control mode (logic inputs or SPI) for motor bridge management in ECU designs.
Technical Context
The A3922KLPTR-T implements a bootstrap-based high-side gate drive architecture with a charge pump regulator that maintains programmable VREG output (8 V or 13 V) across wide input voltage ranges (5.5–50 V). Its dual-mode control-direct TTL-compatible logic inputs (HA, HBn, LAn, LB) or 16-bit SPI interface-enables flexible integration into both simple PWM-driven and complex diagnostic-aware automotive ECUs.
Integrated protection includes adjustable dead-time cross-conduction prevention, VDS monitoring on both high- and low-side switches (programmable thresholds: 1.2 V default), overcurrent detection (2.7–3.3 V trip), open-load sensing (225 mV on-state threshold), and comprehensive fault reporting via status registers. Diagnostics support on-line verification under serial command per ISO 26262 SEooC requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Range | 5.5 V to 50 V - enables operation during cold-crank (6 V) and load-dump (40+ V) automotive transients without external regulation |
| VREG Output | Programmable 8 V or 13 V - powers low-side drivers and charges bootstrap capacitors; stable down to VBB = 5.5 V |
| Dead Time | 1.25–2.15 µs (default 1.6 µs) - prevents shoot-through in external N-MOSFET H-bridge by configurable timing between high/low-side switching |
| Current Sense Gain | 35 V/V (default), ±2% gain error - provides accurate motor phase current measurement with <±1 mV input offset for closed-loop control |
| Gate Drive Strength | RDS(on)UP = 8 Ω (HS, 25°C), RDS(on)DN = 2.4 Ω (LS, 25°C) - drives typical 10 nF gate capacitance with 190 ns turn-on / 120 ns turn-off times |
| Diagnostic Coverage | ASIL D SEooC per ISO 26262 - verified fault detection for VBB undervoltage, VREG OV/UV, overtemperature (175°C trip), VDS faults, and open-load conditions |
| Interface | SPI-compatible 16-bit serial interface + TTL logic inputs - allows configuration, real-time status readback, and fault logging without MCU GPIO overhead |
Pinout & Package
Package: 28-pin eTSSOP (suffix 'LP') with exposed thermal pad; 9.7 mm × 4.4 mm footprint, 1.2 mm nominal height; lead-free, 100% matte-tin leadframe plating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CP2 | Charge pump capacitor high terminal | Connects to CP1 via ceramic capacitor (470 nF typical) to generate boosted gate drive voltage for high-side N-MOSFETs |
| VBB | Main power supply input | Accepts unregulated 5.5–50 V battery input; powers internal regulators, charge pump, and logic; requires local 100 nF decoupling |
| VBRG | High-side drain voltage monitor | Senses voltage at top of external H-bridge to enable VDS short-circuit detection with programmable 1.2 V threshold |
| GHA, GHB | High-side gate drive outputs | Floating outputs driving gates of external N-MOSFETs; each sourced from CA/CB bootstrap supplies; RDS(on)UP = 8 Ω @ 25°C |
| GLA, GLB | Low-side gate drive outputs | Ground-referenced outputs driving low-side N-MOSFET gates; powered by VREG; RDS(on)DN = 2.4 Ω @ 25°C |
| CSP, CSM | Current sense amplifier inputs | Differential inputs for shunt-based motor current sensing; common-mode range –1 V to +2 V; supports bidirectional measurement |
| CSO | Current sense amplifier output | Analog output (0.3–4.8 V) scaled by 35× gain and programmable offset; used for closed-loop current control or overcurrent fault triggering |
| HA, HBn, LAn, LB | Direct logic control inputs | TTL-compatible, battery-voltage-tolerant (0–50 V) inputs enabling PWM or static control of bridge phases without level-shifting |
| SDI, SDO, SCK, STRn | SPI-compatible serial interface | 16-bit MSB-first interface for configuration (dead time, VDS threshold), status readback, and diagnostic verification commands |
| LSS | Low-side source return | Independent return path for low-side gate discharge current; must be connected to common source node of external low-side MOSFETs |
| GND | Ground reference | Unified analog/digital/power ground; thermal pad must be soldered to PCB ground plane for thermal and EMI performance |
Key Features
| Feature | Design Value |
|---|---|
| Programmable gate drive voltage | VREG selectable between 8 V and 13 V via serial register, ensuring reliable enhancement of diverse N-MOSFETs across battery voltage range |
| Bootstrap gate drive architecture | CA/CB terminals supply floating high-side gate drive using external 100 nF ceramic capacitors; supports continuous PWM operation up to 100 kHz |
| Adjustable dead time | 6-bit programmable dead time (1.25–2.15 µs) prevents shoot-through during phase commutation in brushed DC motor control |
| Integrated current sense amplifier | 35 V/V gain, ±1 mV input offset, 500 kHz bandwidth - eliminates need for external op-amp and reduces BOM count in motor current feedback loops |
| ASIL D–compliant diagnostics | On-line diagnostic verification, fault blanking, and register-accessible status bits meet ISO 26262 hardware safety requirements for automotive safety-related systems |
| Battery-compliant logic inputs | HA, HBn, LAn, LB tolerate 0–50 V - enables direct connection to vehicle battery or microcontroller I/O without external protection circuitry |
Applications
| Electric Power Steering (EPS) | Automotive HVAC Blower Motor |
|---|---|
Use Scenario: Bidirectional torque assist in rack-and-pinion steering systems requiring precise current-controlled motor actuation under varying load and temperature. IC Role / Device Role / Timing Role: Full-bridge pre-driver controlling dual N-MOSFET half-bridges; manages synchronous rectification, current sensing, and fault response within 10 µs latency. Use Value: Enables ASIL D–compliant motor control with integrated VDS and overcurrent protection, reducing system-level validation effort and eliminating external sense amplifiers. | Use Scenario: Variable-speed blower fan in climate control systems, operating across 6–16 V battery range including cold-crank conditions. IC Role / Device Role / Timing Role: H-bridge driver with programmable dead time and bootstrap gate drive; handles PWM-controlled forward/reverse operation and stall detection. Use Value: Maintains gate drive capability down to 5.5 V VBB while delivering 2.4 Ω low-side RDS(on), ensuring reliable startup and continuous operation during engine cranking. |
| Transmission Solenoid Control | Seat/Mirror Actuator Driver |
Use Scenario: High-current pulse-width modulated control of linear solenoids in automatic transmission valve bodies, demanding robust short-circuit protection. IC Role / Device Role / Timing Role: Pre-driver with VDS monitoring on high-side switches and programmable fault blank time to distinguish transient spikes from true shorts. Use Value: Integrated VDS threshold (1.2 V default) and 7.5 µs overcurrent qualify time prevent nuisance tripping during solenoid inrush, improving shift reliability. | Use Scenario: Compact, low-noise bidirectional drive for small brushed DC motors in power seats and side mirrors, requiring silent operation and EMI control. IC Role / Device Role / Timing Role: Logic-controlled full-bridge with synchronous rectification and programmable dead time to minimize switching noise and heat generation. Use Value: Reduces audible coil whine via precise dead-time tuning and eliminates external gate resistors due to matched propagation delays (<15 ns phase-to-phase mismatch). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar full-bridge MOSFET driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| DRV8876PWPR | Single-package integrated H-bridge (MOSFETs + driver); 45 V max, no VDS monitoring; SPI interface only; no ASIL compliance | Targeted at cost-sensitive non-safety applications (e.g., consumer robotics); lacks diagnostic verification and open-load detection | Select when board space is critical and functional safety is not required; avoid for automotive ECU use where fault coverage is mandated |
| MPQ6532GR-A | Automotive-grade dual half-bridge driver; 50 V rating; ASIL B compliant; no integrated current sense amp; uses external VDS comparators | Requires external components for current sensing and VDS fault detection; suitable for modular designs where diagnostics are handled at MCU level | Choose when leveraging existing MCU ADC resources and needing higher peak current capability (3 A vs A3922's pre-driver 1.5 A gate drive); verify ASIL B sufficiency for target system |
Compared with DRV8876PWPR and MPQ6532GR-A, the A3922KLPTR-T uniquely combines ASIL D SEooC certification, integrated current sense amplifier with programmable gain/offset, and on-chip VDS monitoring - enabling single-chip, safety-certifiable motor control without external analog signal conditioning.
Availability
A3922KLPTR-T is available at Aetrix Electronics and suitable for automotive electronic control units, brushed DC motor actuation systems, and solenoid-based transmission controls requiring stable component supply, long-term lifecycle assurance, and ASIL-compliant design continuity.
Supply support for A3922KLPTR-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 driver solutions for automotive and industrial markets.
The A3922 product line is engineered specifically for ASIL D–compliant, high-reliability automotive motor control applications - delivering integrated gate driving, diagnostics, and current sensing in a single eTSSOP package for electric power steering, HVAC, and transmission systems.
FAQ
What is the minimum supply voltage required for functional operation of the A3922KLPTR-T?
The A3922KLPTR-T operates functionally from 5.5 V to 50 V VBB. At 5.5–6 V, it maintains gate drive capability but with reduced VREG output (7.9–9.5 V) and limited current sourcing - sufficient for cold-crank scenarios in automotive systems. Below 5.5 V, the device enters undervoltage lockout and disables all gate outputs to protect external MOSFETs.
How does the A3922KLPTR-T prevent shoot-through in the external H-bridge?
The A3922KLPTR-T prevents shoot-through using two mechanisms: (1) hardware-enforced logic lockout that blocks simultaneous high-side and low-side activation on the same phase, and (2) programmable dead time (1.25–2.15 µs) inserted between turn-off of one switch and turn-on of the complementary switch. Both are active in logic and SPI control modes.
Can the A3922KLPTR-T drive both high-side and low-side N-channel MOSFETs without external level shifters?
Yes. The A3922KLPTR-T integrates a charge pump and bootstrap architecture to generate floating gate drive voltages for high-side N-MOSFETs, and uses VREG (8 V or 13 V) for low-side drive. No external level shifters are needed - only external bootstrap capacitors (CA, CB) and charge pump capacitor (CP1–CP2) are required.
What diagnostic functions are accessible via the serial interface of the A3922KLPTR-T?
The A3922KLPTR-T serial interface provides full access to diagnostic registers including overcurrent status, VDS fault flags, open-load detection, temperature warnings, VREG/VBB UV/OV events, and fault mask settings. It also supports on-line verification commands to confirm diagnostic circuit integrity - a requirement for ISO 26262 ASIL D compliance.
Is the A3922KLPTR-T pin-compatible with earlier Allegro full-bridge drivers like the A3921?
No. The A3922KLPTR-T is not pin-compatible with the A3921. It features a revised 28-pin eTSSOP layout with repositioned bootstrap (CA/CB), current sense (CSP/CSM/CSO), and diagnostic pins. Migration requires PCB redesign and firmware updates to accommodate new register maps, dead time programming, and enhanced diagnostic reporting structure.
A3922KLPTR-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:
- Brushed DC
- Function:
- Controller - Commutation, Direction Management
- Output Configuration:
- Pre-Driver - Half Bridge (2)
- Interface:
- SPI
- Technology:
- NMOS
- 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
A3922KLPTR-T FAQ
1.How can I place an order for A3922KLPTR-T through Aetrix?
Please submit a Request for Quotation (RFQ) for A3922KLPTR-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 A3922KLPTR-T reliable?
The price and inventory of A3922KLPTR-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for A3922KLPTR-T is usually 5 days.
3.What payment methods are accepted for A3922KLPTR-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for A3922KLPTR-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for A3922KLPTR-T?
A3922KLPTR-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your A3922KLPTR-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 A3922KLPTR-T?
For technical support, including A3922KLPTR-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your A3922KLPTR-T requirements.
6.How does Aetrix verify that A3922KLPTR-T is sourced from the original manufacturer or authorized distributors?
All A3922KLPTR-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 A3922KLPTR-T meets industry standards.
7.What is the process for return or replacement of A3922KLPTR-T?
All A3922KLPTR-T units undergo pre-shipment inspection (PSI). If there is an issue with A3922KLPTR-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 A3922KLPTR-T part is unused and in its original packaging.
Return procedure for A3922KLPTR-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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