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Allegro MicroSystems ARG81401KLPATR
- Part No.:
- ARG81401KLPATR
- Manufacturer:
- Allegro MicroSystems
- Package:
- 20-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
ARG81401KLPATR.pdf
- Description:
- IC REG BUCK 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,444
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Product details
Overview
ARG81401KLPATR from Allegro MicroSystems is an automotive-grade power management IC featuring a buck or buck-boost pre-regulator, dual LDOs (5 V/200 mA and 3.3 V/300 mA), programmable window watchdog timer, and active-low NPOR with 22.5 ms typical delay. It operates from 3–36 V input, supports −40°C to 150°C junction temperature, and is designed for underhood microcontroller and CAN power supply applications.
For engineers reviewing the ARG81401KLPATR datasheet, ARG81401KLPATR pinout, ARG81401KLPATR application, or ARG81401KLPATR equivalent, key selection criteria include its AEC-Q100 qualification, adjustable 250 kHz–2.4 MHz switching frequency, dual-bandgap fault detection architecture, ENBAT ignition-enable compatibility, and thermal shutdown protection at 170°C typical.
Technical Context
The ARG81401KLPATR integrates a synchronous buck-boost pre-regulator generating a tightly regulated 6.6 V intermediate rail (VREG), which feeds two foldback-protected LDOs. Its control loop uses dual independent bandgaps-BG1 for VREG/3V3/VCP regulation reference and BG2 for V5 reference and fault detection-enhancing long-term reliability in high-temperature automotive environments.
It implements a programmable window watchdog timer with fixed 30 ms activation delay, WDENn enable/disable pin (active low), and WDADJ pin for external resistor-based timeout configuration. Frequency dithering (±12%) and hiccup-mode short-circuit protection further support robust EMI/EMC compliance and fault resilience in safety-critical modules.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 3 V to 36 V operating; 40 V absolute max - supports full automotive battery transients including load dump. |
| VREG Output | 6.6 V ±1.5% (typ), 1 A capable - provides stable intermediate rail for internal LDOs and external circuitry. |
| V5 LDO | 5 V ±2%, 200 mA output with foldback short-circuit protection - powers CAN transceivers or logic interfaces. |
| 3V3 LDO | 3.3 V ±2.1%, 300 mA output with foldback protection - supplies microcontrollers or sensors directly. |
| Switching Freq | Adjustable 250 kHz–2.4 MHz via FSET/SYNC pin - enables EMI optimization and layout flexibility. |
| NPOR Delay | 22.5 ms typical fixed delay - ensures reliable microcontroller reset timing after power-up. |
| Watchdog | Programmable window timer with 30 ms startup delay and FAST/SLOW timeout ranges (0.5–100 ms) - supports safe processor supervision during boot and runtime. |
| Junction Temp | −40°C to +150°C - qualified for underhood placement in EPS, TCU, and ABS modules. |
Pinout & Package
ARG81401KLPATR is supplied in a 20-pin eTSSOP package (suffix "LP") with exposed thermal pad, 1.2 mm max height, and 100% matte tin lead frame - optimized for high-power-density automotive PCB layouts and thermal dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Main input voltage supply | Accepts 3–36 V automotive battery; withstands 40 V transient surges. |
| ENBAT | Ignition-enable input | High-voltage compatible (−13 V to 40 V with resistor); triggers startup on key-on. |
| VREG | Pre-regulator feedback | Connects to output capacitor network; regulates 6.6 V intermediate rail. |
| VLDO | LDO input supply | Powered by VREG; feeds both 5 V and 3.3 V linear regulators. |
| 3V3 / V5 | LDO outputs | 3.3 V/300 mA and 5 V/200 mA regulated supplies with foldback current limiting. |
| WDENn | Watchdog enable | Active-low pin; open or low enables watchdog; high disables for programming. |
| WDIN | Watchdog refresh input | Rising-edge triggered; must be toggled within programmed window to prevent reset. |
| WDADJ | Watchdog timeout adjust | External resistor to ground sets FAST/SLOW timeout range and clock division. |
| NPOR | Power-on reset output | Open-drain, active-low signal with 22.5 ms delay; asserts on undervoltage or fault. |
| LX / LG | Switch node / gate drive | LX connects to external inductor/diode; LG drives external boost MOSFET gate. |
| VCP / CP1 / CP2 | Charge pump terminals | Generate boosted gate drive voltage; require external 10 nF ceramic capacitors. |
| GND / PGND | Analog / power ground | Separate grounds minimize noise coupling between control and power circuits. |
| FSET/SYNC | Frequency setting/sync | Resistor sets switching frequency; accepts external clock for synchronization. |
| COMP | Error amplifier compensation | Connects RC network for loop stability; supports type II/III compensation. |
| VCC | Internal regulator bypass | Bypass capacitor stabilizes internal 4.6 V bias rail for analog circuitry. |
| PGND | Power ground | Low-impedance return path for LX current; ties to thermal pad for heat sinking. |
| Pad | Exposed thermal pad | Internally connected to PGND; must be soldered to PCB copper for thermal performance. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-bandgap architecture | Independent BG1 (VREG/3V3/VCP regulation) and BG2 (V5 reference + fault detection) improve system-level reliability and fault isolation. |
| Programmable window watchdog | Configurable timeout (0.5–100 ms) with fixed 30 ms activation delay - prevents premature reset during processor boot while enabling precise supervision. |
| ENBAT ignition interface | Compatible with high-side switched battery rails via 1 kΩ resistor - eliminates need for external level-shifting circuitry in start-stop systems. |
| Frequency dithering | ±12% spread-spectrum modulation - reduces peak EMI emissions without compromising efficiency or thermal performance. |
| Hiccup-mode OCP | Adaptive fault recovery (15–60 PWM cycles before shutdown) - limits average power during sustained overloads while preserving component integrity. |
| Pin-to-pin/pin-to-ground tolerance | Every pin withstands −0.3 V to rated max voltage - simplifies board-level ESD protection and improves field robustness. |
Applications
| Electronic Power Steering (EPS) | Transmission Control Unit (TCU) |
|---|---|
Use Scenario: High-temperature power supply for EPS motor controller MCU, CAN interface, and position sensors under hood. IC Role / Device Role / Timing Role: Primary PMIC providing isolated 5 V (CAN) and 3.3 V (MCU core) rails from 12 V battery; NPOR synchronizes MCU reset with stable V5/V3V3. Use Value: Dual-bandgap monitoring ensures continuous fault detection across temperature extremes; ENBAT enables seamless start-stop operation without auxiliary wake-up circuitry. | Use Scenario: Centralized power management for TCU's dual-core processor, solenoid drivers, and LIN/CAN communication subsystems. IC Role / Device Role / Timing Role: Buck-boost pre-regulator delivers 6.6 V to LDOs; watchdog supervises processor execution; NPOR guarantees deterministic boot sequence. Use Value: Adjustable switching frequency avoids critical EMI bands in crowded transmission bay; hiccup-mode OCP protects against solenoid short-circuits without latch-off. |
| Advanced Braking Systems (ABS) | Emissions Control Module |
Use Scenario: Safety-critical power source for ABS hydraulic control unit MCU, wheel speed sensor interfaces, and valve driver ICs. IC Role / Device Role / Timing Role: Provides redundant 3.3 V and 5 V supplies with independent UV/OV monitoring; NPOR initiates ASIL-B compliant reset sequence. Use Value: Latched MPOR response to charge pump faults ensures fail-safe shutdown; thermal shutdown at 170°C prevents thermal runaway during brake-by-wire actuation. | Use Scenario: Powering OBD-II controller, NOx/DPF sensors, and CAN diagnostics interface in exhaust aftertreatment systems. IC Role / Device Role / Timing Role: Delivers clean 3.3 V for precision ADCs and 5 V for CAN transceivers; watchdog guards against firmware lockup during emission cycle validation. Use Value: Wide VIN range (3–36 V) accommodates cold-cranking dips and alternator surges; frequency dithering meets stringent OEM EMC requirements near catalytic converters. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar power management applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| A4409KLPTR-T | Successor device with updated thermal design, extended VIN range (2.7–40 V), and enhanced watchdog flexibility; same 20-pin eTSSOP package. | Supports newer automotive platforms requiring lower cold-crank start voltage and improved diagnostic coverage. | Select for new designs requiring lifecycle continuity and enhanced fault reporting capability. |
| TPS65381A-Q1 | TI automotive PMIC with integrated 3.3 V/200 mA and 5 V/300 mA LDOs, but no buck-boost pre-regulator - requires external DC/DC stage. | Used where system already includes a primary 5 V/3.3 V buck converter and only needs LDO supervision and watchdog. | Choose when pre-regulation is handled externally and higher integration of diagnostics is required. |
Compared with ARG81401KLPATR, the A4409KLPTR-T offers direct replacement capability with improved cold-crank performance and updated safety features, while the TPS65381A-Q1 serves as a functional alternative only when a discrete buck-boost stage is available - neither matches the integrated pre-regulator + dual-LDO + watchdog architecture of ARG81401KLPATR in a single package.
Availability
ARG81401KLPATR is available at Aetrix Electronics and suitable for Electronic Power Steering (EPS), Transmission Control Units (TCU), and Advanced Braking Systems (ABS) requiring stable component supply despite end-of-life status.
Supply support for ARG81401KLPATR 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 magnetic sensing and power IC solutions, specializing in high-reliability semiconductor devices for automotive, industrial, and consumer markets.
The ARG81401KLPATR belongs to Allegro's automotive power management product line, engineered specifically for underhood applications demanding AEC-Q100 qualification, extended temperature operation, and integrated functional safety features.
FAQ
What is the recommended replacement for ARG81401KLPATR in new designs?
The A4409KLPTR-T is the officially recommended substitution for ARG81401KLPATR in new designs, offering identical pinout, enhanced cold-crank performance down to 2.7 V, and updated watchdog functionality. While ARG81401KLPATR remains available for legacy production, Allegro advises transitioning to A4409KLPTR-T to ensure long-term supply and access to latest automotive safety features. Both parts share the same 20-pin eTSSOP package and thermal pad layout.
Does ARG81401KLPATR support both buck and buck-boost topologies in the same design?
Yes, ARG81401KLPATR supports configurable operation in either buck or buck-boost mode via external component selection - removing D2 and Q1 enables pure buck operation, while retaining them enables buck-boost. The device automatically adapts control loops and protection thresholds accordingly. This flexibility allows one ARG81401KLPATR design to serve multiple vehicle platforms with varying battery voltage profiles, including 12 V and 24 V commercial vehicles.
How does the dual-bandgap architecture in ARG81401KLPATR improve system reliability?
The dual-bandgap architecture in ARG81401KLPATR separates regulation references (BG1 for VREG/3V3/VCP) from fault-detection references (BG2 for V5 and VREG/3V3/VCP fault checking), eliminating single-point failure modes. If BG1 drifts or fails, BG2 continues monitoring for undervoltage events, and vice versa. This redundancy ensures continuous fault detection across −40°C to 150°C operation - a critical requirement for ASIL-B compliant automotive control modules using ARG81401KLPATR.
What is the function of the ENBAT pin on ARG81401KLPATR, and how should it be interfaced?
The ENBAT pin on ARG81401KLPATR is an ignition-enable input that accepts high-voltage signals (−13 V to 40 V) through a 1 kΩ series resistor, allowing direct connection to switched battery rails without level-shifting. It triggers device startup when voltage exceeds 3.2 V (typical) and initiates controlled shutdown when falling below 2.5 V (typical), with 700 mV hysteresis. This enables seamless integration into start-stop systems and eliminates external wake-up circuitry in ARG81401KLPATR-based designs.
Can ARG81401KLPATR's watchdog timer be disabled during factory programming?
Yes, ARG81401KLPATR's window watchdog timer can be fully disabled during factory programming or field reflash using the WDENn pin, which is active-low. Holding WDENn high (≥2 V) disables the watchdog, allowing unrestricted MCU firmware updates without refresh constraints. Once programming completes, pulling WDENn low or leaving it open re-enables the watchdog with its configured timeout window - a feature explicitly supported in ARG81401KLPATR's functional specification and timing diagrams.
ARG81401KLPATR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Allegro MicroSystems
- Series:
- *
- Package/Case:
- 20-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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:
- 20-TSSOP-EP
ARG81401KLPATR FAQ
1.How can I place an order for ARG81401KLPATR through Aetrix?
Please submit a Request for Quotation (RFQ) for ARG81401KLPATR 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 ARG81401KLPATR reliable?
The price and inventory of ARG81401KLPATR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ARG81401KLPATR is usually 5 days.
3.What payment methods are accepted for ARG81401KLPATR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ARG81401KLPATR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ARG81401KLPATR?
ARG81401KLPATR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ARG81401KLPATR 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 ARG81401KLPATR?
For technical support, including ARG81401KLPATR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ARG81401KLPATR requirements.
6.How does Aetrix verify that ARG81401KLPATR is sourced from the original manufacturer or authorized distributors?
All ARG81401KLPATR 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 ARG81401KLPATR meets industry standards.
7.What is the process for return or replacement of ARG81401KLPATR?
All ARG81401KLPATR units undergo pre-shipment inspection (PSI). If there is an issue with ARG81401KLPATR, 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 ARG81401KLPATR part is unused and in its original packaging.
Return procedure for ARG81401KLPATR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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