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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Voltage Regulators - DC DC Switching Regulators

Allegro MicroSystems A4412KLVTR-T

Name: A4412KLVTR-T
Brand: Allegro MicroSystems
SKU: A4412KLVTR-T
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: A4412KLVTR-T

Manufacturer:: Allegro MicroSystems

Category:: Voltage Regulators - DC DC Switching Regulators

Package:: 38-TFSOP (0.173", 4.40mm Width) Exposed Pad

Datasheet:: A4412KLVTR-T.pdf

Description:: IC REG BUCK BOOST ADJ 38ETSSOP

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Product details

Overview

A4412KLVTR-T from Allegro MicroSystems is an ASIL-D SEooC automotive power management IC featuring a buck/buck-boost pre-regulator, five integrated linear regulators (3.3 V/90 mA, 5 V/55 mA, 5 V/30 mA, 5 V/200 mA CAN, and 5 V/100 mA short-to-battery protected), and an adjustable 1.3–3.3 V/400 mA synchronous buck regulator - all operating across 3.8–40 V_IN in under-hood environments up to 150°C junction temperature.

For engineers reviewing the A4412KLVTR-T datasheet, A4412KLVTR-T pinout, A4412KLVTR-T application, or A4412KLVTR-T equivalent, key selection considerations include its dual-bandgap fault detection architecture, SPI-controlled rail enable/disable, window watchdog timer with flash mode, and comprehensive protection suite including foldback OCP, short-to-battery on V5P, and LX short-circuit detection.

Technical Context

The A4412KLVTR-T integrates a buck/buck-boost pre-regulator (VREG output = 5.35 V) that supplies both internal LDOs and a programmable synchronous buck stage. Its control loop uses two independent bandgaps (BGVREF for regulation, BGFAULT for safety monitoring), enabling ISO 26262-compliant fault coverage.

Diagnostic capability includes NPOR (active-low open-drain fault flag), ENBAT status output (ENBATS), and SPI-accessible fault registers. The 2 ms window watchdog accepts processor pulses and supports secure SPI reset or flash-mode entry - critical for fail-safe microprocessor supervision in EPS and powertrain modules.

Key Specifications

Parameter	Value and Actual Design Meaning
Input Voltage Range	3.8 V to 40 V operating; 50 V absolute max - supports cold-crank and load-dump conditions in 12 V automotive systems.
VREG Output	5.35 V ±100 mV at 1.2 A - tightly regulated intermediate rail powering all internal regulators and gate drivers.
Adjustable Buck Output	1.3 V to 3.3 V, 400 mA - set via external FB resistors; includes pulse-by-pulse current limit and hiccup-mode short-circuit protection.
Linear Regulators	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) - all with foldback OCP; V5P adds short-to-battery protection.
Watchdog Timer	2 ms window watchdog with fail-safe timeout; configurable via SPI for flash mode or restart - ensures deterministic microprocessor health monitoring.
Safety Certification	ASIL-D SEooC per ISO 26262 (when used per safety manual); AEC-Q100 Grade 0 qualified (−40°C to +150°C).
Package	38-pin eTSSOP-LV with exposed thermal pad - low-profile (1.2 mm max height) for high-temperature under-hood mounting.

Pinout & Package

The A4412KLVTR-T is supplied in a 38-lead eTSSOP package (suffix "LV") with exposed power pad, optimized for thermal dissipation in high-temperature automotive applications.

Pin/Terminal	Circuit Role	Design Meaning
1 (VCP)	Charge pump reservoir capacitor connection	Stabilizes gate drive voltage for boost FET; requires 1 µF ceramic capacitor to ground.
2,3 (VIN)	Main input voltage supply	Dual pins reduce IR drop and improve current handling for 3.8–40 V automotive battery input.
5 (ENBAT)	High-voltage ignition enable input	Accepts −13 V to 50 V with series resistor; enables device during key-on; status reported on ENBATS.
15 (NPOR)	Active-low open-drain power-on reset output	Asserted if fault detected on VREG, 3V3, or V5A rails - used for system-level POR coordination.
26 (V5P)	5 V / 100 mA protected linear regulator output	Short-to-battery tolerant; foldback OCP; dedicated supply for safety-critical sensors or CAN transceivers.
30 (5VCAN)	5 V / 200 mA CAN interface regulator output	Low-noise, high-current rail for CAN FD transceivers; isolated from other 5 V rails for EMI robustness.
31 (VREG)	Buck/buck-boost pre-regulator output	5.35 V intermediate rail feeding all LDOs and synchronous buck stage; monitored for UV/OV faults.
PAD	Exposed thermal pad	Must be soldered to PCB ground plane for thermal performance and R_θJA = 30°C/W operation.

Key Features

Feature	Design Value
Dual independent bandgaps	BGVREF for regulation accuracy and BGFAULT for redundant fault checking - increases diagnostic coverage for ASIL-D compliance.
SPI-controlled rail enable/disable	Individual disable of V5A, V5B, V5CAN, V5P, and 3V3 via secure SPI commands - enables dynamic power sequencing and low-power sleep modes.
Window watchdog with flash mode	2 ms window timer requiring precise pulse timing; flash mode halts watchdog while preserving state - simplifies safe firmware updates.
Short-to-battery protection on V5P	V5P survives direct connection to battery (up to 50 V) without damage - eliminates need for external protection diodes in sensor power paths.
EMI reduction features	Frequency dithering (±10%) and controlled LX slew rates (1.4–1.5 V/ns) - reduces peak radiated emissions without external filtering.

Applications

EPS Modules	Automotive Powertrains
Use Scenario: Electric power steering control unit requiring multiple isolated, fault-monitored power rails in engine bay. IC Role / Device Role / Timing Role: Central PMIC providing 3.3 V MCU core, 5 V CAN transceiver, 5 V sensor bias, and 5 V protected actuator driver rails - all with SPI-configurable sequencing and fault reporting. Use Value: Eliminates discrete LDOs and external watchdog, reducing BOM count by ≥7 components while meeting ASIL-D diagnostic requirements.	Use Scenario: Transmission control module operating near hot exhaust components with wide input voltage transients. IC Role / Device Role / Timing Role: Primary power supervisor delivering regulated 3.3 V and 5 V rails to MCU, solenoid drivers, and position sensors - with thermal shutdown at 165°C and cold-crank support down to 3.8 V. Use Value: Enables single-chip power solution rated for 150°C ambient, avoiding derating penalties and enabling smaller heatsink-free PCB layout.
CAN Power Supplies	High-Temperature Sensor Interfaces
Use Scenario: Body control module supplying isolated 5 V to multiple CAN FD transceivers with ESD and fault isolation. IC Role / Device Role / Timing Role: Dedicated V5CAN rail (200 mA) with low noise and independent OCP - decoupled from other 5 V outputs to prevent cross-rail fault propagation. Use Value: Guarantees stable CAN bus operation during load dump (40 V) and prevents bus lock-up due to transceiver overcurrent.	Use Scenario: Exhaust gas temperature sensor node mounted directly on turbo housing with minimal thermal margin. IC Role / Device Role / Timing Role: Provides 3.3 V/90 mA and 5 V/100 mA (V5P) rails with short-to-battery tolerance - powering analog front-end and signal conditioning circuitry. Use Value: Survives direct VBAT shorts during sensor harness faults and operates continuously at 150°C junction temperature without derating.

EPS Modules

Automotive Powertrains

Use Scenario: Electric power steering control unit requiring multiple isolated, fault-monitored power rails in engine bay.

IC Role / Device Role / Timing Role: Central PMIC providing 3.3 V MCU core, 5 V CAN transceiver, 5 V sensor bias, and 5 V protected actuator driver rails - all with SPI-configurable sequencing and fault reporting.

Use Value: Eliminates discrete LDOs and external watchdog, reducing BOM count by ≥7 components while meeting ASIL-D diagnostic requirements.

Use Scenario: Transmission control module operating near hot exhaust components with wide input voltage transients.

IC Role / Device Role / Timing Role: Primary power supervisor delivering regulated 3.3 V and 5 V rails to MCU, solenoid drivers, and position sensors - with thermal shutdown at 165°C and cold-crank support down to 3.8 V.

Use Value: Enables single-chip power solution rated for 150°C ambient, avoiding derating penalties and enabling smaller heatsink-free PCB layout.

CAN Power Supplies

High-Temperature Sensor Interfaces

Use Scenario: Body control module supplying isolated 5 V to multiple CAN FD transceivers with ESD and fault isolation.

IC Role / Device Role / Timing Role: Dedicated V5CAN rail (200 mA) with low noise and independent OCP - decoupled from other 5 V outputs to prevent cross-rail fault propagation.

Use Value: Guarantees stable CAN bus operation during load dump (40 V) and prevents bus lock-up due to transceiver overcurrent.

Use Scenario: Exhaust gas temperature sensor node mounted directly on turbo housing with minimal thermal margin.

IC Role / Device Role / Timing Role: Provides 3.3 V/90 mA and 5 V/100 mA (V5P) rails with short-to-battery tolerance - powering analog front-end and signal conditioning circuitry.

Use Value: Survives direct VBAT shorts during sensor harness faults and operates continuously at 150°C junction temperature without derating.

Equivalent & Alternatives

The following parts are listed as comparable options for similar automotive power management applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
MAX25201ATPA/V+ (Maxim Integrated)	Single 3.3 V/300 mA + 5 V/300 mA dual-output buck; no integrated LDOs or watchdog; ASIL-B certified only.	Lacks multi-rail flexibility and safety diagnostics; suitable for non-safety-critical body electronics only.	Select when cost-sensitive design requires only two regulated outputs and no functional safety certification.
TPS65381A-Q1 (Texas Instruments)	3.3 V/250 mA + 5 V/250 mA dual buck + 5 V/150 mA LDO; integrated window watchdog; ASIL-B compliant.	No buck-boost pre-regulator; limited to 5.5–42 V input; lacks short-to-battery protection on any rail.	Prefer for designs needing watchdog + dual buck but not requiring V5P short-to-battery tolerance or extended low-VIN operation.

Compared with MAX25201ATPA/V+ and TPS65381A-Q1, the A4412KLVTR-T uniquely combines ASIL-D SEooC certification, five independently protected LDOs, short-to-battery tolerance on V5P, and buck/buck-boost topology for ultra-wide VIN range - making it the only option for high-integrity EPS and powertrain applications demanding full fault coverage.

Availability

A4412KLVTR-T is available at Aetrix Electronics and suitable for automotive EPS modules, powertrain control units, CAN FD gateway designs, and high-temperature sensor interfaces requiring stable component supply across extended temperature and voltage ranges.

Supply support for A4412KLVTR-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 power ICs and magnetic sensors, specializing in automotive-grade solutions with rigorous AEC-Q100 qualification and ISO 26262 functional safety development processes.

The A4412 product line delivers integrated power management for safety-critical automotive subsystems - combining pre-regulation, multiple protected LDOs, watchdog supervision, and SPI configurability into a single ASIL-D SEooC device for under-hood deployment.

FAQ

What is the maximum junction temperature rating for the A4412KLVTR-T?

The A4412KLVTR-T is rated for a maximum junction temperature of 165°C, with thermal shutdown activated at that threshold and 15°C hysteresis. Its 38-pin eTSSOP-LV package achieves R_θJA = 30°C/W when the exposed pad is properly soldered to a thermal plane - enabling reliable operation in under-hood environments up to 150°C ambient.

Does the A4412KLVTR-T support both buck and buck-boost pre-regulator modes?

Yes, the A4412KLVTR-T automatically selects buck or buck-boost mode based on input voltage: buck mode activates above 5.5 V_IN, while buck-boost engages down to 3.8 V_IN. This allows seamless operation during cold-crank events without external mode control - maintaining stable 5.35 V VREG output across the full 3.8–40 V automotive input range.

How does the short-to-battery protection on the V5P rail function in the A4412KLVTR-T?

The V5P output of the A4412KLVTR-T withstands direct connection to battery voltage (up to 50 V) without damage or latch-up, thanks to internal protection circuitry that isolates the regulator during short-to-VBAT events. This eliminates the need for external Schottky diodes in sensor power paths and maintains functionality after harness faults - a key requirement for ASIL-D sensor interfaces.

Can the A4412KLVTR-T's window watchdog be disabled or reconfigured via SPI?

Yes, the A4412KLVTR-T's 2 ms window watchdog supports secure SPI commands for flash mode entry (pausing watchdog while preserving state) and full restart. It cannot be permanently disabled, but its behavior is fully configurable - including timeout window adjustment and fault response - ensuring compliance with ISO 26262 requirements for fail-safe microprocessor supervision.

What safety documentation is provided for the A4412KLVTR-T under ISO 26262?

Allegro provides a complete ASIL-D Safety Element out of Context (SEooC) package for the A4412KLVTR-T, including safety manual, FMEDA report, safety analysis summary, and hardware/software safety requirements specification - all aligned with ISO 26262-5 and -6. These documents define usage constraints and integration requirements necessary to achieve ASIL-D compliance in end-systems.

A4412KLVTR-T 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:: Step-Down, Step-Up/Step-Down

Output Configuration:: Positive

Topology:: Buck, Buck-Boost

Output Type:: Adjustable

Number of Outputs:: 1

Voltage - Input (Min):: 3.8V

Voltage - Input (Max):: 40V

Voltage - Output (Min/Fixed):: 1.3V

Voltage - Output (Max):: 3.3V

Current - Output:: 400mA

Frequency - Switching:: 2.2MHz

Synchronous Rectifier:: Yes

Operating Temperature:: -40°C ~ 150°C

Grade:: Automotive

Qualification:: AEC-Q100

Mounting Type:: Surface Mount

Supplier Device Package:: 38-eTSSOP

A4412KLVTR-T FAQ

1.How can I place an order for A4412KLVTR-T through Aetrix?

Please submit a Request for Quotation (RFQ) for A4412KLVTR-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 A4412KLVTR-T reliable?

The price and inventory of A4412KLVTR-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for A4412KLVTR-T is usually 5 days.

3.What payment methods are accepted for A4412KLVTR-T?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for A4412KLVTR-T transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for A4412KLVTR-T?

A4412KLVTR-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your A4412KLVTR-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 A4412KLVTR-T?

For technical support, including A4412KLVTR-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your A4412KLVTR-T requirements.

6.How does Aetrix verify that A4412KLVTR-T is sourced from the original manufacturer or authorized distributors?

All A4412KLVTR-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 A4412KLVTR-T meets industry standards.

7.What is the process for return or replacement of A4412KLVTR-T?

All A4412KLVTR-T units undergo pre-shipment inspection (PSI). If there is an issue with A4412KLVTR-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 A4412KLVTR-T part is unused and in its original packaging.

Return procedure for A4412KLVTR-T:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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