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Allegro MicroSystems A81407KLVATR-1
- Part No.:
- A81407KLVATR-1
- Manufacturer:
- Allegro MicroSystems
- Category:
- Voltage Regulators - Linear + Switching
- Package:
- 38-TFSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
A81407KLVATR-1.pdf
- Description:
- PMIC FOR SAFETY-RELATED SYSTEMS
- Quantity:
- Payment:
- Shipping:
Inventory:1,352
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Product details
Overview
A81407KLVATR-1 from Allegro MicroSystems is a multi-output automotive power management IC integrating a 2.2 MHz buck/buck-boost pre-regulator (VREG = 5.35 V), four LDOs-including a user-selectable 5 V / 375 mA microcontroller supply (VUC), two 5 V / 120 mA short-to-battery-protected regulators (V5P1/V5P2), and one 5 V / 150 mA general-purpose LDO (V5A)-plus four independent floating gate drivers with integrated charge pumps, triple watchdog timers (PWWD/WWD/QAWD), SPI interface, and analog multiplexer. It delivers system power and high-side load control for EPS, ABS, and TCU applications.
For engineers reviewing the A81407KLVATR-1 datasheet, A81407KLVATR-1 pinout, A81407KLVATR-1 application, or A81407KLVATR-1 equivalent, key selection considerations include ASIL D SEooC compliance per ISO 26262, 3.8–36 V input range with 40 V absolute max, thermal shutdown at 165°C, EMI-reducing frequency dithering, and fault reporting via NPOR/FFn/WD_Fn signals with SPI-readable registers.
Technical Context
The A81407KLVATR-1 implements a dual-bandgap architecture (BG1 for regulation, BG2 for fault checking) to enhance safety coverage and enable robust fault detection. Its pre-regulator operates in buck or buck-boost topology with programmable soft-start, hiccup-mode overcurrent protection, and slew-controlled LX node (1.4 V/ns rise, 1.5 V/ns fall) to minimize EMI.
Four floating gate drivers-GVBB/SVBB, GW/SW, GV/SV, GU/SU-are controlled via SPI and powered by dedicated charge pumps (VCP, VCP2), enabling N-channel MOSFET drive across full VIN (3.8–36 V) with phase-voltage slew rate support. Diagnostic outputs include latched WD_Fn, open-drain NPOR, FFn, and POE safe-state disable signal.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.8 V to 36 V operating; 40 V absolute maximum-supports wide automotive battery transients including cold-crank and load-dump conditions. |
| Pre-Regulator Output | 5.35 V ±0.1 V at 1 A load-tightly regulated intermediate rail supplying all internal LDOs and gate driver charge pumps. |
| VUC Output | 5.0 V ±0.1 V at 375 mA-configurable microcontroller supply with foldback short-circuit protection and 4.68 V UVLO threshold. |
| V5P1/V5P2 Protection | Short-to-battery (VBAT) protection-enables remote sensor powering without risk of damage during battery reversal or overvoltage faults. |
| Watchdog Types | Pulse-Width (PWWD), Window (WWD), and Q&A (QAWD)-provides layered safety monitoring for diverse MCU supervision requirements. |
| Operating Temperature | −40°C to +150°C junction range-qualified for under-hood automotive environments per AEC-Q100 Grade 0. |
| SPI Interface | 16-bit transfers with 5-bit message ID, 5-bit CRC, 3-bit frame counter, and chip ID-ensures secure, error-checked communication for configuration and diagnostics. |
Pinout & Package
Package: 38-pin eTSSOP with exposed thermal pad (suffix "LV"), RoHS-compliant matte tin lead frame, 4000 pieces per 7-inch reel.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 VCP | Charge pump reservoir capacitor connection | Provides stable voltage for floating gate drivers controlling external N-MOSFETs in motor phases or solenoid valves. |
| 11 GVBB / 12 SVBB | Battery-line MOSFET gate drive and source reference | Enables high-side disconnect or reverse-supply protection for main battery input path. |
| 13 GW / 14 SW 15 GV / 16 SV 17 GU / 18 SU |
Motor phase U/V/W gate drives and source references | Supports three-phase motor control with independent sourcing/sinking capability and charge-pump boosted gate voltage. |
| 30 VUC | Selectable microcontroller supply output | Delivers 5.0 V / 375 mA with foldback current limiting and short-to-battery tolerance for critical MCU power domain. |
| 28 WD_Fn | Open-drain watchdog fault output | Latches low on any watchdog timeout event (PWWD/WWD/QAWD), signaling immediate MCU intervention required. |
Key Features
| Feature | Design Value |
|---|---|
| ASIL D SEooC Compliance | Developed per ISO 26262 for integration into ASIL D systems when used per safety manual-reduces functional safety validation burden for OEMs. |
| EMI Reduction Architecture | 2.2 MHz switching with ±10% frequency dithering and controlled LX slew rates (1.4/1.5 V/ns) lowers peak radiated emissions without external filters. |
| Dual Bandgap Fault Detection | Independent BG1 (regulation) and BG2 (fault checking) paths improve diagnostic coverage and detect bandgap failure modes not visible to single-sensor designs. |
| Safe-State Control (POE) | Active-low latched output that disables external subsystems (e.g., motor driver ICs) upon watchdog fault-prevents unsafe actuation during failures. |
| Analog Multiplexer (AMUXO) | Single-pin output reporting scaled values of VUC, V5A, V5P1, V5P2, VENBAT, VCP, VCP2, BG1, BG2, TEMP, VREG, and VIN-reduces MCU ADC channel count. |
Applications
| Electronic Power Steering (EPS) | Advanced Braking Systems (ABS) |
|---|---|
|
Use Scenario: Powers MCU, CAN transceiver, position sensors, and three-phase motor drivers in column-assist or rack-assist EPS modules. IC Role / Device Role / Timing Role: Central power manager providing regulated rails (VUC, V5A, V5P1/P2), gate drive for motor phases (GU/GV/GW), and safety-critical watchdog supervision. Use Value: Enables single-chip solution for both logic power and high-current motor control with ASIL D-ready diagnostics-reducing BOM count and PCB area vs. discrete PMIC + gate driver combos. |
Use Scenario: Supplies ABS controller MCU, wheel speed sensor interfaces, solenoid valve drivers, and CAN/FlexRay communication ICs in hydraulic modulator units. IC Role / Device Role / Timing Role: Delivers fault-tolerant 5 V rails with short-to-battery protection for remote wheel sensors and controls N-MOSFETs driving ABS solenoids via floating gate drivers. Use Value: Eliminates need for external reverse-battery protection diodes and discrete LDOs-improving efficiency and reliability while meeting stringent ISO 16750-2 transient immunity requirements. |
| Transmission Control Units (TCU) | Emissions Control Modules |
|
Use Scenario: Manages power for TCU MCU, gear position sensors, shift solenoid drivers, and LIN/CAN communication in automatic and dual-clutch transmissions. IC Role / Device Role / Timing Role: Provides isolated 5 V supplies (V5P1/V5P2) for isolated sensor domains and high-side gate drivers for transmission solenoids with fast turn-on/turn-off via charge pump. Use Value: Supports hot-plug operation and battery reversal survivability-critical for serviceability and field durability in harsh under-hood environments. |
Use Scenario: Powers OBD-II controller, NOx/lambda sensors, EGR valve actuators, and CAN bus in diesel aftertreatment and gasoline direct injection systems. IC Role / Device Role / Timing Role: Supplies multiple protected LDO outputs and enables switched loads (e.g., EGR cooler fans) using floating gate drivers with SPI-configurable timing and fault response. Use Value: Integrates startup self-tests (UV/ov/overtemp), analog mux monitoring, and triple watchdogs-meeting ISO 26262 diagnostic coverage targets for emissions-critical functions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multi-output automotive power management applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MPQ4332-AEC1 | Single 3.5 A buck regulator with no integrated LDOs or gate drivers; lacks ASIL D certification and watchdog types beyond basic window watchdog. | Requires external LDOs and high-side drivers for motor/solenoid control-increasing component count and board space. | Choose when only pre-regulation is needed and safety certification is handled at system level. |
| TPS65381A-Q1 | Includes 3 LDOs and 2 gate drivers but no buck/buck-boost pre-regulator-requires external 5.35 V supply; supports only window watchdog. | Cannot replace A81407KLVATR-1's integrated pre-regulator function-limits use to systems with existing intermediate rail. | Choose when intermediate 5.35 V rail is already available and lower gate driver count suffices. |
Compared with MPQ4332-AEC1 and TPS65381A-Q1, the A81407KLVATR-1 uniquely integrates pre-regulation, four protected LDOs, four floating gate drivers, triple watchdogs, and ASIL D SEooC compliance in one package-enabling complete power and safety subsystem consolidation for next-generation chassis controllers.
Availability
A81407KLVATR-1 is available at Aetrix Electronics and suitable for electronic power steering (EPS), advanced braking systems (ABS), and transmission control units (TCU) requiring stable component supply across extended temperature and automotive qualification cycles.
Supply support for A81407KLVATR-1 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 global leader in motion control and energy-efficient power semiconductor solutions, specializing in high-reliability magnetic sensing and automotive-grade power ICs.
The A81407 product line was designed specifically for chassis and powertrain ECUs needing integrated power regulation, motor/solenoid control, and functional safety compliance-targeting EPS, ABS, TCU, and emissions control applications.
FAQ
What is the key functional difference between A81407KLVATR and A81407KLVATR-1?
The A81407KLVATR-1 configures the VUC output to 5.0 V (±0.1 V), whereas the base A81407KLVATR sets VUC to 3.3 V (±0.07 V). Both share identical pinout, package, LDO current ratings (375 mA), protection features, gate drivers, watchdog architecture, and ASIL D SEooC compliance. The -1 suffix denotes factory-programmed 5 V VUC for microcontroller supply in systems requiring higher I/O voltage compatibility.
Does A81407KLVATR-1 support both buck and buck-boost pre-regulator topologies?
Yes, the A81407KLVATR-1 automatically selects buck mode when VIN > 5.5 V and buck-boost mode when VIN < 5.5 V, maintaining regulated 5.35 V VREG output across the full 3.8–36 V input range. This seamless transition ensures uninterrupted power to downstream LDOs and gate drivers during cold-crank (as low as 3.8 V) and load-dump (up to 36 V) events.
How does the A81407KLVATR-1 implement short-to-battery protection on V5P1 and V5P2?
The A81407KLVATR-1 monitors V5P1 and V5P2 outputs against VBAT using dedicated comparators. If either rail exceeds VBAT by >200 mV, the corresponding LDO is immediately disconnected via internal switches. Recovery requires SPI command or power cycle. This protects remote sensors connected to long harnesses from damage during battery reversal or alternator faults.
Can the A81407KLVATR-1 gate drivers control external P-channel MOSFETs?
No-the A81407KLVATR-1 gate drivers (GVBB, GW, GV, GU) are optimized for N-channel MOSFETs with source-referenced outputs (SVBB, SW, SV, SU). They rely on integrated charge pumps to generate gate voltages above VIN, enabling full enhancement of N-MOSFETs. Driving P-channel devices would require external level-shifting circuitry not supported by the IC's architecture.
What diagnostic data can be read via the A81407KLVATR-1 analog multiplexer (AMUXO)?
The A81407KLVATR-1 AMUXO pin outputs scaled analog voltages representing 12 internal parameters: VUC, V5A, V5P1, V5P2, VENBAT, VCP, VCP2, BG1, BG2, die temperature, VREG, and VIN. Each is divided by a fixed ratio (e.g., VUC ÷ 2, VENBAT ÷ 8) for MCU ADC compatibility-enabling real-time health monitoring without additional external sensors.
A81407KLVATR-1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Allegro MicroSystems
- Series:
- -
- Package/Case:
- 38-TFSOP (0.173", 4.40mm Width) Exposed Pad
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Topology:
- Step-Down (Buck) (1) or Step-Down/Step-Up (Buck/Boost) (1), Linear (LDO) (4)
- Number of Outputs:
- 9
- Frequency - Switching:
- 2.2MHz
- Voltage/Current - Output 1:
- 5.35V, -
- Voltage/Current - Output 2:
- Fixed, Selectable, Fixed, 3.3V/5V, 375mA
- Voltage/Current - Output 3:
- 5V, 150mA
- w/LED Driver:
- No
- w/Supervisor:
- No
- w/Sequencer:
- Yes
- Voltage - Supply:
- 3.8V ~ 36V
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 38-eTSSOP
A81407KLVATR-1 FAQ
1.How can I place an order for A81407KLVATR-1 through Aetrix?
Please submit a Request for Quotation (RFQ) for A81407KLVATR-1 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 A81407KLVATR-1 reliable?
The price and inventory of A81407KLVATR-1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for A81407KLVATR-1 is usually 5 days.
3.What payment methods are accepted for A81407KLVATR-1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for A81407KLVATR-1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for A81407KLVATR-1?
A81407KLVATR-1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your A81407KLVATR-1 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 A81407KLVATR-1?
For technical support, including A81407KLVATR-1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your A81407KLVATR-1 requirements.
6.How does Aetrix verify that A81407KLVATR-1 is sourced from the original manufacturer or authorized distributors?
All A81407KLVATR-1 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 A81407KLVATR-1 meets industry standards.
7.What is the process for return or replacement of A81407KLVATR-1?
All A81407KLVATR-1 units undergo pre-shipment inspection (PSI). If there is an issue with A81407KLVATR-1, 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 A81407KLVATR-1 part is unused and in its original packaging.
Return procedure for A81407KLVATR-1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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