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Allegro MicroSystems A4411KLVTR-T
- Part No.:
- A4411KLVTR-T
- Manufacturer:
- Allegro MicroSystems
- Category:
- Voltage Regulators - Linear + Switching
- Package:
- 38-TFSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
A4411KLVTR-T.pdf
- Description:
- IC REG QD BUCK/BST/LNR 38ETSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,738
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Product details
Overview
A4411KLVTR-T from Allegro MicroSystems is an automotive-grade power management IC configured as a buck or buck-boost pre-regulator delivering tightly regulated 5.35 V (VREG) to three LDOs and one adjustable synchronous buck stage. It integrates a pulse-width window watchdog (1–2 ms programmable), NPOR (2 ms fixed delay), POK5V, dual bandgaps, and thermal shutdown - designed for underhood CAN and microprocessor power supplies in electronic power steering modules.
For engineers reviewing the A4411KLVTR-T datasheet, A4411KLVTR-T pinout, A4411KLVTR-T application, or A4411KLVTR-T equivalent, key selection criteria include its −40°C to 135°C operating range, 3.5–36 V input, 250 kHz–2.4 MHz adjustable switching frequency, V5P tracking capability (to FBADJ or V5SNR), and pin-to-pin tolerant 38-pin eTSSOP-LV package with exposed thermal pad.
Technical Context
The A4411KLVTR-T implements a dual-stage regulation architecture: a buck-boost pre-regulator (VREG) feeds three independent 5 V LDOs (V5SNR, V5CAN, V5P) and an adjustable synchronous buck (0.8–3.3 V, 800 mA). Its TRACK pin selects whether V5P tracks FBADJ (for remote sensor rail alignment) or V5SNR (for local sensor synchronization).
It features a programmable pulse-width window watchdog (PWWD) with scalable activation delay, ±8%/±13%/±18% tolerance selection via WDTOL, and active-low WDENn enable. Dual bandgaps (BGVREF for regulation, BGFAULT for fault checking) ensure long-term reliability in high-temperature automotive environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.5 V to 36 V (supports cold-crank down to 3.5 V; 40 V absolute max) |
| VREG Output | 5.35 V ±100 mV at 1.25 A - stable intermediate rail for downstream LDOs and buck stage |
| Adjustable Buck Output | 0.8 V to 3.3 V / 800 mA - set by external RFB1/RFB2; reference voltage 800 mV ±13 mV |
| LDO Outputs | V5SNR: 5 V / 150 mA; V5CAN: 5 V / 200 mA; V5P: 5 V / 120 mA with foldback + short-to-battery protection |
| Switching Frequency | 250 kHz to 2.4 MHz - adjustable via RFSET resistor; supports external SYNC and dithering for EMI reduction |
| Watchdog Window | Programmable 1–2 ms pulse-width detection with ±8%, ±13%, or ±18% tolerance - enables robust microcontroller supervision |
| Operating Temp | −40°C to 135°C ambient - AEC-Q100 qualified for underhood automotive applications |
Pinout & Package
Package: 38-pin eTSSOP with exposed thermal pad (suffix "LV"), optimized for high-power dissipation in constrained automotive layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (pins 2,3) | Main input supply connection | Accepts 3.5–36 V battery input; dual pins reduce IR drop and improve current handling |
| VREG (pin 32) | Pre-regulator output | 5.35 V intermediate rail supplying all LDOs and ADJ buck stage; monitored for UV/OV faults |
| TRACK (pin 12) | V5P tracking reference selector | Logic-high → V5P tracks FBADJ; logic-low → V5P tracks V5SNR - enables platform reuse across sensor topologies |
| WDADJ (pin 21) | Watchdog window time setting | Resistor-to-ground sets 1–2 ms pulse-width detection window; scales activation delay for processor startup |
| POK5V (pin 9) | Power OK status output | Open-drain signal asserted when any of V5SNR/V5CAN/V5P falls outside 4.5–5.5 V window |
| NPOR (pin 8) | Power-on reset output | Active-low open-drain with fixed 2 ms delay - provides deterministic system reset timing after power-up |
Key Features
| Feature | Design Value |
|---|---|
| Buck-boost pre-regulator | Enables operation down to 3.5 V VIN - critical for automotive cold-crank conditions without requiring external boost stage |
| V5P tracking & protection | Tracks either FBADJ or V5SNR with ±25 mV accuracy; includes foldback + short-to-battery protection for remote sensors |
| Programmable PWWD | Configurable 1–2 ms window with selectable tolerance (±8%/±13%/±18%) - adapts to diverse MCU watchdog requirements |
| Dual bandgap architecture | Separate BGVREF (regulation) and BGFAULT (monitoring) references - improves long-term stability and fault detection integrity |
| Slew rate control (SLEW pin) | Adjusts LX1 rise time via external resistor - reduces EMI/EMC emissions without sacrificing efficiency |
Applications
| Electronic Power Steering (EPS) | CAN Node Power Supply |
|---|---|
Use Scenario: High-vibration, high-temperature underhood module powering torque sensors, motor drivers, and CAN transceivers. IC Role / Device Role / Timing Role: Central power hub delivering isolated, protected 5 V rails (V5SNR, V5CAN, V5P) and adjustable core voltage (ADJ) with integrated watchdog supervision. Use Value: Eliminates need for discrete LDOs and external watchdog; meets AEC-Q100 Grade 0 requirements up to 135°C ambient. | Use Scenario: Robust 5 V supply for ISO 11898-2/3 CAN transceivers in body control modules or gateway ECUs. IC Role / Device Role / Timing Role: Provides V5CAN with foldback short-circuit protection and POK5V fault signaling - ensures CAN bus remains operational during load faults. Use Value: Prevents bus lockup during transceiver overloads; POK5V enables host MCU to initiate safe recovery without external monitoring circuitry. |
| Remote Sensor Hub | Microprocessor Core Supply |
Use Scenario: Distributed sensor cluster (e.g., temperature, pressure) located away from main ECU, requiring tracked 5 V rail. IC Role / Device Role / Timing Role: V5P delivers 5 V with tracking to FBADJ (for ADC reference alignment) or V5SNR (for synchronized wake-up); includes short-to-battery protection. Use Value: Enables single-supply design for mixed-signal sensor nodes; eliminates risk of damage from battery shorts in harness wiring. | Use Scenario: Adjustable 0.8–3.3 V supply for automotive microcontrollers (e.g., S32K, TC3xx) requiring dynamic voltage scaling. IC Role / Device Role / Timing Role: Synchronous buck regulator (ADJ) with soft-start, hiccup-mode OCP, and 800 mA output - directly powers MCU core or I/O domains. Use Value: Reduces external component count vs. discrete buck controller + MOSFET solution; supports fast transient response for burst-mode processing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multi-rail automotive power management applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MPQ4332-AEC1 | Single buck controller (no integrated pre-regulator or LDOs); requires external FETs and discrete LDOs | Lacks integrated V5P tracking, PWWD, NPOR, and POK5V - needs companion ICs for full functionality | Choose when board space allows discrete implementation and higher design flexibility is prioritized over integration |
| TPS65381A-Q1 | Includes 3x LDOs and watchdog but no buck-boost pre-regulator; max VIN = 28 V; no V5P short-to-battery protection | Not suitable for 36 V cold-crank or underhood >135°C ambient; lacks V5P tracking and ENBAT ignition enable | Consider only for lower-voltage, lower-temperature body electronics where pre-regulator redundancy is unnecessary |
Compared with MPQ4332-AEC1 and TPS65381A-Q1, the A4411KLVTR-T uniquely integrates buck-boost pre-regulation, three protected LDOs, adjustable buck, and programmable PWWD in one AEC-Q100-qualified device - reducing BOM count, PCB area, and validation effort for demanding underhood applications.
Availability
A4411KLVTR-T is available at Aetrix Electronics and suitable for electronic power steering (EPS), automotive powertrain control units, and CAN node power supplies requiring stable component supply across extended temperature ranges and automotive lifecycle commitments.
Supply support for A4411KLVTR-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 global leader in precision sensing and power ICs, specializing in magnetic sensors, motor drivers, and automotive-qualified power management solutions.
The A4411 product line targets high-reliability automotive subsystems - specifically engineered to replace discrete power trees in EPS, transmission control, and ADAS modules with integrated, AEC-Q100-compliant multi-rail regulators.
FAQ
What is the maximum input voltage rating for the A4411KLVTR-T?
The A4411KLVTR-T has an absolute maximum input voltage rating of 40 V on the VIN pins, with continuous operation supported from 3.5 V to 36 V. This wide range accommodates automotive battery transients including load dump and cold-crank conditions. The device incorporates under- and overvoltage lockout (UVLO) with start threshold of 5.4 V (typical) and stop threshold of 3.04 V (typical), ensuring reliable startup and graceful shutdown across harsh vehicle electrical environments. Operation beyond 36 V is not recommended for sustained use.
How does the TRACK pin function in the A4411KLVTR-T?
The TRACK pin on the A4411KLVTR-T configures the reference source for the V5P tracking LDO: when pulled high, V5P tracks the FBADJ pin (enabling alignment with the adjustable buck output voltage); when pulled low or grounded, V5P tracks V5SNR (synchronizing with the local sensor LDO). This dual-reference capability allows the same A4411KLVTR-T design to support multiple sensor architectures without hardware changes - critical for platform scalability in automotive ECUs. Tracking accuracy is ±25 mV when referencing V5SNR and ±0.5% when referencing FBADJ.
Does the A4411KLVTR-T support external clock synchronization?
Yes, the A4411KLVTR-T supports external clock synchronization via the FSET/SYNC pin (pin 11). When driven with a clean CMOS clock signal, the internal oscillator locks to the external frequency - enabling precise EMI reduction through frequency harmonization across multiple switching regulators on the same PCB. The device accepts external clocks from 250 kHz to 2.4 MHz, matching its internal adjustable range. Synchronization does not affect the programmable pulse-width window watchdog (PWWD), which operates independently using its internal or optional external WDCLK,IN signal.
What protections are implemented on the V5P output of the A4411KLVTR-T?
The V5P output of the A4411KLVTR-T includes three distinct protections: foldback short-circuit current limiting (−200 mA typical limit, collapsing to −90 mA at zero volts), short-to-battery (VBAT) protection (detects and disables V5P if output rises above ~6.5 V), and thermal shutdown. These protections are hardware-enforced and latched - requiring a full power cycle or ENB/ENBAT reassertion to recover. Unlike V5SNR and V5CAN, V5P's short-to-battery detection prevents damage from harness faults common in remote sensor installations, making it uniquely suited for distributed automotive sensor networks.
Can the A4411KLVTR-T operate in buck-only mode, and what are the input voltage requirements?
Yes, the A4411KLVTR-T can be configured for buck-only operation by omitting the boost components (Q1, D2) and adjusting compensation. In this mode, the minimum operating input voltage increases to 5.8 V (typical), compared to 3.5 V in buck-boost mode - due to loss of boost capability during cold-crank. The VIN UVLO start threshold remains 5.4 V (typical), but the device will not start below 5.8 V VIN in buck-only configuration. This mode is appropriate for less demanding applications such as cabin electronics where cold-crank immunity is not required, offering slightly higher efficiency at nominal 12 V battery conditions.
A4411KLVTR-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
- Topology:
- Step-Down (Buck) (1) Synchronous or Step-Down/Step-Up (Buck/Boost) (1), Linear (LDO) (3)
- Number of Outputs:
- 4
- Frequency - Switching:
- 250kHz ~ 2.4MHz
- Voltage/Current - Output 1:
- 0.8V ~ 3.3V, 800mA
- Voltage/Current - Output 2:
- 5V, 150mA
- Voltage/Current - Output 3:
- 5V, 120mA
- w/LED Driver:
- No
- w/Supervisor:
- No
- w/Sequencer:
- Yes
- Voltage - Supply:
- 3.5V ~ 36V
- Operating Temperature:
- -40°C ~ 135°C
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 38-eTSSOP
A4411KLVTR-T FAQ
1.How can I place an order for A4411KLVTR-T through Aetrix?
Please submit a Request for Quotation (RFQ) for A4411KLVTR-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 A4411KLVTR-T reliable?
The price and inventory of A4411KLVTR-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for A4411KLVTR-T is usually 5 days.
3.What payment methods are accepted for A4411KLVTR-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for A4411KLVTR-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for A4411KLVTR-T?
A4411KLVTR-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your A4411KLVTR-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 A4411KLVTR-T?
For technical support, including A4411KLVTR-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your A4411KLVTR-T requirements.
6.How does Aetrix verify that A4411KLVTR-T is sourced from the original manufacturer or authorized distributors?
All A4411KLVTR-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 A4411KLVTR-T meets industry standards.
7.What is the process for return or replacement of A4411KLVTR-T?
All A4411KLVTR-T units undergo pre-shipment inspection (PSI). If there is an issue with A4411KLVTR-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 A4411KLVTR-T part is unused and in its original packaging.
Return procedure for A4411KLVTR-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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