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Allegro MicroSystems ARG81400KLVATR
- Part No.:
- ARG81400KLVATR
- Manufacturer:
- Allegro MicroSystems
- Package:
- 38-TFSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
ARG81400KLVATR.pdf
- Description:
- IC REG BUCK-BOOST 38TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,047
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Product details
Overview
ARG81400KLVATR from Allegro MicroSystems is a multi-output power management IC designed for automotive and industrial MCU power domains. It integrates a buck/buck-boost pre-regulator (VREG = 5.35 V), an adjustable synchronous buck (1.25–3.3 V, 600 mA), five LDOs (3.3 V/90 mA, 5 V/55 mA, 5 V/30 mA, 5 V/200 mA, 5 V/100 mA with short-to-supply protection), SPI interface, window watchdog timer (250–2000 μs programmable), and ASIL D SEooC safety compliance per ISO 26262 - deployed in electronic power steering and transmission control units.
For engineers reviewing the ARG81400KLVATR datasheet, ARG81400KLVATR pinout, ARG81400KLVATR application, or ARG81400KLVATR equivalent, this device delivers high-temperature operation (–40°C to +150°C), dual bandgap fault detection, ENBAT/ENB enable flexibility, NPOR fault signaling, and diagnostic reporting via SPI - critical for functional safety validation and ECU power architecture design.
Technical Context
The ARG81400KLVATR employs a buck or buck-boost pre-regulator to generate a stable 5.35 V VREG rail, which supplies five linear regulators and an independent adjustable synchronous buck. Its control architecture includes two error amplifiers (COMP1/COMP2), soft-start pins (SS1/SS2), and dual bandgaps (BGVREF for regulation, BGFAULT for fault checking) to meet ASIL D requirements.
It supports ignition-level enable (ENBAT up to 50 V) and logic-level enable (ENB), provides individual 5 V rail disable via SPI, and features comprehensive protection: pulse-by-pulse current limiting on both switching stages, hiccup-mode short-circuit response, LX short-circuit detection, missing diode (D1) sensing, thermal shutdown at 165°C, and OV/UV monitoring on all outputs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.8 V to 40 V operating, 50 V absolute max - supports wide automotive battery transients including cold-crank and load-dump conditions. |
| VREG Output | 5.35 V ±0.1 V at 1 A - pre-regulated supply feeding all LDOs and synchronous buck, with buck/boost topology enabling operation down to 3.8 V input. |
| Adjustable Buck | 1.25–3.3 V output, 600 mA continuous - configured via FB pin (1.25 V reference), suitable for core voltage scaling of MCUs or DSPs. |
| LDO Outputs | 3.3 V/90 mA, 5 V/55 mA (V5A), 5 V/30 mA (V5B), 5 V/200 mA (V5CAN), 5 V/100 mA (V5P) - V5P includes short-to-supply protection for CAN transceiver isolation. |
| Watchdog Timer | Window-type with programmable detect periods (250/500/1000/2000 μs) - enters active state post-NPOR, supports flash mode and secure SPI reset for fail-safe recovery. |
| Safety Certification | ASIL D SEooC per ISO 26262 - developed with dual bandgaps, startup self-test (BIST), and fault-latched diagnostics (e.g., *VREG_OV, *ILIM,LX2) for safety-critical ECU integration. |
| Package | 38-pin eTSSOP (LV suffix), 1.2 mm max height, exposed thermal pad - optimized for high-power density and thermal dissipation in under-hood environments. |
Pinout & Package
ARG81400KLVATR is housed in a 38-pin eTSSOP package (suffix "LV") with exposed thermal pad for enhanced thermal performance in automotive under-hood applications. Pin functions are validated per Allegro's official terminal list table and pinout diagram (ARG81400-DS, Rev. 9).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (pins 2,3) | Main input voltage supply | Accepts 3.8–40 V DC; dual pins reduce IR drop and improve transient handling during load dump. |
| ENBAT (pin 5) | High-voltage ignition enable input | Accepts up to 50 V with internal current limiting; status reported via ENBATS (pin 7) for key-switch monitoring. |
| ENB (pin 17) | Logic-level enable input | CMOS-compatible (2 V threshold); used for microprocessor-controlled power sequencing and sleep/wake coordination. |
| VREG (pin 31) | Pre-regulator output | 5.35 V regulated rail powering all LDOs and synchronous buck; monitored for OV/UV faults triggering NPOR (pin 15). |
| NPOR (pin 15) | Active-low open-drain fault output | Asserted low on VREG, 3V3, or V5A regulator fault - provides hardware reset signal to MCU without SPI dependency. |
| FFn (pin 21) | Active-low open-drain fault flag | General-purpose fault alert; latched until cleared via SPI or power cycle - enables software-based fault logging and recovery. |
| SCK/SDI/SDO/STRn (pins 14,11,12,13) | SPI interface signals | Full-duplex 4-wire SPI (mode 0) for reading fault registers, configuring watchdog, disabling individual rails (V5A/V5B/V5CAN/V5P), and setting dithering. |
| V5P (pin 26) | Protected 5 V LDO output | 100 mA, short-to-supply tolerant - designed for isolated CAN transceivers requiring robust fault containment. |
Key Features
| Feature | Design Value |
|---|---|
| ASIL D SEooC Compliance | Hardware safety element out-of-context certified per ISO 26262 - enables use in safety-critical systems (e.g., EPS, ABS) when integrated per safety manual guidance. |
| Dual Bandgap Architecture | Independent BGVREF (regulation) and BGFAULT (fault checking) paths - increases fault coverage and eliminates single-point failure in voltage reference chain. |
| Individual Rail Disable via SPI | Software-controllable shutdown of V5A, V5B, V5CAN, and V5P - allows dynamic power gating for ECU sub-systems without hardware rework. |
| Frequency Dithering & Slew Control | ±10% switching frequency modulation + controlled LX1 slew rates (1.4/1.5 V/ns) - reduces peak EMI emissions to meet CISPR 25 Class 5 requirements. |
| Short-to-Supply Protected V5P | V5P output withstands direct short to battery (VBAT) - prevents latch-up and enables safe operation in CAN nodes exposed to reverse-battery or jump-start events. |
| Startup Self-Test (BIST) | Automated verification of OV/UV detect, thermal shutdown, power-on enable, and watchdog functionality at power-up - satisfies ASIL D diagnostic coverage requirements. |
Applications
| Electronic Power Steering (EPS) | Advanced Braking Systems (ABS) |
|---|---|
Use Scenario: Powers MCU, motor gate drivers, and position sensors in electric power-assisted steering modules operating at 125°C ambient. IC Role / Device Role / Timing Role: Primary system PMIC delivering sequenced, fault-monitored rails - V5CAN powers CAN FD transceiver; V5P isolates short-to-battery faults. Use Value: Dual bandgap fault detection and ASIL D compliance ensure uninterrupted torque assist during safety-critical maneuvers, meeting ISO 26262 ASIL D FMEDA targets. |
Use Scenario: Supplies ABS controller MCU, solenoid drivers, wheel speed sensor interfaces, and LIN communication in high-vibration brake actuation units. IC Role / Device Role / Timing Role: Central power hub with NPOR-driven hardware reset and SPI-accessible fault logs - enables deterministic recovery after overvoltage transients on 12 V bus. Use Value: ENBAT-triggered startup ensures immediate power availability upon ignition, while hiccup-mode protection prevents thermal runaway during solenoid coil short circuits. |
| Transmission Control Units (TCU) | Emissions Control Modules |
Use Scenario: Provides regulated power to TCU's dual-core MCU, gearbox position sensors, shift solenoids, and CAN/CAN FD communication links in hot engine bay environments. IC Role / Device Role / Timing Role: Multi-rail regulator with adjustable synchronous buck (for core voltage) and five LDOs - V5CAN supports high-speed CAN FD data logging; V5P protects CAN transceivers. Use Value: 150°C junction rating and thermal shutdown hysteresis (15°C) sustain reliable operation across full drivetrain temperature range without derating. |
Use Scenario: Powers OBD-II controller, NOx/lambda sensors, exhaust gas recirculation (EGR) valve drivers, and CAN diagnostics in diesel aftertreatment systems. IC Role / Device Role / Timing Role: Safety-aware PMIC with window watchdog and fault-flagged diagnostics - detects and reports rail faults before emission compliance thresholds are violated. Use Value: SPI-configurable watchdog timeout (250–2000 μs) aligns with real-time control loop timing of closed-loop air-fuel ratio correction algorithms. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multi-output automotive PMIC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| NCP81239MNTXG | 4-channel buck + 3 LDOs; no integrated watchdog or ASIL D certification; 40 V max input; 32-pin QFN. | Lacks window watchdog, dual bandgap, and ISO 26262 compliance - unsuitable for ASIL B+ systems like EPS or ABS. | Select only for non-safety-critical body control modules where cost and footprint are prioritized over functional safety. |
| TPS65381A-Q1 | Single buck + 4 LDOs + watchdog + ASIL B compliance; 40 V input; 32-pin HTSSOP; no adjustable buck output. | Supports ASIL B but not ASIL D; lacks adjustable synchronous buck and V5P short-to-supply protection - insufficient for high-integrity MCU core voltage scaling. | Use where ASIL B suffices and fixed 3.3 V/5 V rails dominate; avoid when V5P-level fault containment or 1.25–3.3 V core regulation is required. |
Compared with NCP81239MNTXG and TPS65381A-Q1, ARG81400KLVATR uniquely combines ASIL D SEooC certification, adjustable synchronous buck, short-to-supply protected V5P, and dual-bandgap fault detection - making it the only option qualified for EPS and ABS ECUs requiring full ISO 26262 compliance.
Availability
ARG81400KLVATR 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 ranges and automotive qualification standards.
Supply support for ARG81400KLVATR 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 high-performance power ICs, magnetic sensors, and motion control solutions for automotive and industrial markets.
The ARG81400 product line is engineered as a safety-certified multi-output regulator targeting ASIL D automotive ECUs - specifically designed to consolidate power delivery, fault management, and watchdog supervision in space-constrained, high-temperature ECU designs.
FAQ
What is the maximum input voltage rating for the ARG81400KLVATR?
The ARG81400KLVATR has an absolute maximum input voltage rating of 50 V on the VIN pins, with a recommended operating range of 3.8 V to 40 V. This wide input capability supports automotive battery transients such as cold-crank (down to ~3.8 V) and load-dump (up to 40 V), ensuring robust operation in demanding vehicle electrical environments. The ENBAT pin tolerates –13 V to 50 V with external current limiting, enabling direct ignition-switch interface.
Does the ARG81400KLVATR support ASIL D compliance, and how is it implemented?
Yes, the ARG81400KLVATR is developed as an ASIL D safety element out-of-context (SEooC) per ISO 26262. It achieves this through dual independent bandgaps (BGVREF for regulation, BGFAULT for fault checking), startup self-test (BIST) covering OV/UV, thermal shutdown, and watchdog functionality, latched fault reporting (e.g., *VREG_OV, *ILIM,LX2), and hardware fault outputs (NPOR, FFn). These features are documented in the safety manual and must be applied per prescribed integration guidelines to maintain ASIL D integrity.
How does the ARG81400KLVATR protect against short-to-supply faults?
The ARG81400KLVATR provides short-to-supply protection exclusively on the V5P output (pin 26), rated at 5 V/100 mA. This rail incorporates dedicated circuitry to detect and safely limit current during direct shorts to battery voltage (VBAT), preventing damage to downstream CAN transceivers. Other LDOs (V5A, V5B, V5CAN, 3V3) feature foldback overcurrent protection but lack short-to-supply tolerance - confirming V5P's unique role in isolated communication subsystems.
Can the adjustable synchronous buck output of the ARG81400KLVATR be set to 3.3 V, and what is its current capability?
Yes, the adjustable synchronous buck regulator in the ARG81400KLVATR can be configured for 3.3 V output using external feedback resistors (RFB1/RFB2) referenced to its 1.25 V internal FB pin. It delivers up to 600 mA continuously at this voltage, with thermal derating above 125°C ambient. This rail is independent of the fixed 3.3 V LDO (3V3, 90 mA), allowing separate optimization for MCU core voltage versus I/O rail requirements.
What diagnostic capabilities does the ARG81400KLVATR provide via SPI?
The ARG81400KLVATR supports comprehensive SPI-based diagnostics including real-time readout of fault status registers (e.g., VREG_OV, V5A_UV, TSD), programmable watchdog configuration (timeout, flash mode), individual LDO enable/disable control (V5A_DIS, V5B_DIS, etc.), and dithering/slew rate settings. Faults are latched and persist until cleared via SPI command or power cycle - enabling deterministic fault logging and recovery in safety-critical automotive software stacks.
ARG81400KLVATR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Allegro MicroSystems
- Series:
- *
- Package/Case:
- 38-TFSOP (0.173", 4.40mm Width) Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- -
- Output Configuration:
- -
- Topology:
- -
- Output Type:
- -
- Number of Outputs:
- -
- Voltage - Input (Min):
- -
- Voltage - Input (Max):
- -
- Voltage - Output (Min/Fixed):
- -
- Voltage - Output (Max):
- -
- Current - Output:
- -
- Frequency - Switching:
- -
- Synchronous Rectifier:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 38-eTSSOP
ARG81400KLVATR FAQ
1.How can I place an order for ARG81400KLVATR through Aetrix?
Please submit a Request for Quotation (RFQ) for ARG81400KLVATR 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 ARG81400KLVATR reliable?
The price and inventory of ARG81400KLVATR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ARG81400KLVATR is usually 5 days.
3.What payment methods are accepted for ARG81400KLVATR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ARG81400KLVATR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ARG81400KLVATR?
ARG81400KLVATR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ARG81400KLVATR 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 ARG81400KLVATR?
For technical support, including ARG81400KLVATR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ARG81400KLVATR requirements.
6.How does Aetrix verify that ARG81400KLVATR is sourced from the original manufacturer or authorized distributors?
All ARG81400KLVATR 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 ARG81400KLVATR meets industry standards.
7.What is the process for return or replacement of ARG81400KLVATR?
All ARG81400KLVATR units undergo pre-shipment inspection (PSI). If there is an issue with ARG81400KLVATR, 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 ARG81400KLVATR part is unused and in its original packaging.
Return procedure for ARG81400KLVATR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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