Send an Inquiry

To receive a quote for your project, please fill in the following information, and we’ll get back to you promptly.

Submit Inventory List

Please fill in the following information, and we’ll get back to you promptly.

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

Allegro MicroSystems A8586KLJTR-T-1

Name: A8586KLJTR-T-1
Brand: Allegro MicroSystems
SKU: A8586KLJTR-T-1
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

Compare

Part No.:: A8586KLJTR-T-1

Manufacturer:: Allegro MicroSystems

Category:: Voltage Regulators - DC DC Switching Regulators

Package:: 8-SOIC (0.154", 3.90mm Width) Exposed Pad

Datasheet:: A8586KLJTR-T-1.pdf

Description:: IC REG BUCK ADJ 3.5A 8SOIC

Quantity:: RFQ Add To RFQ list

Payment:

Shipping:

Inventory:5,850

Please send an inquiry. Send us your inquiry, and we will respond immediately.

Product details

Overview

A8586KLJTR-T-1 from Allegro MicroSystems is a high-frequency, current-mode synchronous step-down DC/DC regulator with integrated 150 mΩ high-side MOSFET, delivering up to 3.5 A output current, operating from 3.8–36 V input, and supporting adjustable switching frequency up to 4 MHz - used in automotive power rails, industrial distributed supplies, and battery-powered systems requiring low quiescent current (30 µA) and AEC-Q100 qualification.

For engineers reviewing the A8586KLJTR-T-1 datasheet, A8586KLJTR-T-1 pinout, A8586KLJTR-T-1 application, or A8586KLJTR-T-1 equivalent, key selection considerations include PFM-enabled light-load efficiency, dithering-assisted EMI reduction, SOIC-8 thermal-pad package layout compatibility, and VIN UVLO (3.0 V start), FB reference (792 mV), and hiccup-mode short-circuit protection.

Technical Context

The A8586KLJTR-T-1 implements fixed-frequency PWM with current-mode control, internal slope compensation (3.1 A/µs at 2 MHz), and programmable oscillator via external RFREQ resistor. It supports pre-biased startup and soft-start ramp (1.5 ms) with voltage-controlled duty-cycle limiting for dropout operation.

Its protection architecture includes cycle-by-cycle overcurrent detection (4.0–5.5 A limit), BOOT capacitor fault monitoring (7-cycle hiccup on open, 120-cycle on short), freewheeling diode open/short detection, thermal shutdown (170°C), and VIN undervoltage lockout with 0.4 V hysteresis - all designed for robust automotive-grade deployment.

Key Specifications

Parameter	Value and Actual Design Meaning
Input Voltage Range	3.8 V to 36 V - enables direct connection to 12 V/24 V automotive batteries and industrial wide-input rails without pre-regulation.
Output Current	Up to 3.5 A continuous - sufficient for powering microcontrollers, sensors, and communication ICs in compact embedded systems.
Switching Frequency	Programmable up to 4 MHz via FREQ pin resistor - allows operation above AM band (1.6–3.0 MHz typical) to reduce conducted EMI.
Quiescent Current	30 µA operational IQ - extends battery life in always-on vehicle modules and IoT edge nodes.
Feedback Reference	0.792 V ±1.2% - enables precise output regulation from 0.8 V to 30 V using standard resistor dividers (e.g., RFB2 = 40.2 kΩ).
MOSFET RDS(on)	150 mΩ - reduces conduction loss at full load, supporting >90% peak efficiency at 12 V_IN/5 V_OUT.
Thermal Shutdown	170°C with 20°C hysteresis - provides self-recovery under sustained overload while protecting PCB and adjacent components.

Pinout & Package

Package: 8-pin SOIC with exposed thermal pad (LJ suffix), JEDEC-standard footprint, R_θJA = 35°C/W on 4-layer PCB - optimized for thermal performance in space-constrained automotive and industrial layouts.

Pin/Terminal	Circuit Role	Design Meaning
SW	Switch node	Source of internal high-side MOSFET; connects directly to inductor and freewheeling diode cathode - requires minimal trace length and wide copper pour for low EMI and thermal dissipation.
EN	Enable input	High-voltage logic input (rated to 40 V); pulls up internally with 1 µA source - allows direct connection to VIN for automatic startup or system-controlled sequencing.
COMP	Error amplifier output	Compensation node for current-mode loop; accepts series RC network (RZ/CZ) to GND - sets phase margin and transient response; clamped between 0.75 V and 1.5 V during operation.
FB	Feedback input	Inverting input of transconductance error amplifier; senses divided output voltage - regulates V_OUT to 0.792 V reference; supports pre-biased startup by holding COMP low until soft-start exceeds V_FB.
GND	Power ground	Primary return path for control circuitry and power stage - must be connected to exposed thermal pad for optimal thermal and noise performance.
FREQ	Frequency setting	Resistor-to-GND node (RFREQ) programs switching frequency from 0.2 MHz to 4 MHz - e.g., 45.3 kΩ sets 2.0 MHz; dithering enabled (±8%) for EMI reduction.
VIN	Power input	Drain of internal MOSFET and supply for control circuits; accepts 3.8–36 V - requires local 10 µF ceramic capacitor placed near pin to suppress high-frequency ripple.
BST	Bootstrap capacitor	Connects 100 nF capacitor to SW pin - generates gate drive voltage >VIN for high-side MOSFET; internal UVLO (1.8 V) prevents misfiring during bootstrap charging.

Key Features

Feature	Design Value
Frequency dithering	±8% triangular modulation at 12 kHz - spreads spectral energy to reduce peak EMI amplitude in sensitive bands (AM, ADSL).
Pulse-frequency modulation (PFM)	Active only in A8586 (not -1/-2 variants); enables <30 µA light-load IQ by coasting SW node when I_PEAK < 800 mA - improves efficiency at <10% load without external control.
Ceramic-capacitor stability	No external ESR requirement - supports low-ESR MLCCs for compact, low-noise output filtering without tantalum or electrolytic capacitors.
Integrated soft-start	Fixed 1.5 ms ramp time with voltage-controlled frequency scaling (¼ f_SW below 200 mV, ½ f_SW up to 400 mV) - limits inrush current and prevents output overshoot during startup.
Freewheeling diode protection	Detects open diode (SW < −1.25 V for >50 ns) and shorted diode - triggers hiccup mode before MOSFET failure, eliminating need for external diode monitoring circuitry.

Applications

Automotive Body Control Module (BCM)	Industrial PLC I/O Power Supply
Use Scenario: Powers microcontroller, CAN transceiver, and sensor interface in 12 V vehicle electrical system with cold-crank (6 V) and load-dump (40 V) transients. IC Role / Device Role / Timing Role: Primary buck regulator supplying 3.3 V/2 A rail; handles wide VIN range and AEC-Q100 stress conditions including thermal cycling and ESD. Use Value: 30 µA quiescent current minimizes battery drain during vehicle sleep mode; dithering and controlled slew rates meet CISPR 25 Class 5 radiated emissions limits.	Use Scenario: Generates isolated 5 V/3 A auxiliary supply for digital I/O modules in factory automation cabinets with 24 V DC bus. IC Role / Device Role / Timing Role: High-efficiency step-down converter replacing linear regulators; operates continuously under 40°C ambient with forced air cooling. Use Value: 150 mΩ R_DS(on) and PFM mode maintain >88% efficiency at 100 mA load, reducing heat sink size and system power loss.
Portable Medical Diagnostic Device	Smart Building Sensor Node
Use Scenario: Powers FPGA, ADC, and wireless SoC in handheld ultrasound unit powered by Li-ion battery (8–12.6 V). IC Role / Device Role / Timing Role: Main power management IC enabling battery runtime extension and low-noise analog supply generation. Use Value: Programmable 2–4 MHz switching avoids interference with ultrasonic transducer frequencies; ceramic-stable design eliminates audible coil whine.	Use Scenario: Supplies 1.8 V/500 mA rail to BLE MCU and environmental sensors in battery-operated HVAC node with 10-year target lifetime. IC Role / Device Role / Timing Role: Ultra-low-IQ buck regulator managing deep-sleep and active burst modes in energy-harvesting constrained design. Use Value: 30 µA operational IQ and hiccup-mode fault recovery enable reliable autonomous operation without service intervention.

Automotive Body Control Module (BCM)

Industrial PLC I/O Power Supply

Use Scenario: Powers microcontroller, CAN transceiver, and sensor interface in 12 V vehicle electrical system with cold-crank (6 V) and load-dump (40 V) transients.

IC Role / Device Role / Timing Role: Primary buck regulator supplying 3.3 V/2 A rail; handles wide VIN range and AEC-Q100 stress conditions including thermal cycling and ESD.

Use Value: 30 µA quiescent current minimizes battery drain during vehicle sleep mode; dithering and controlled slew rates meet CISPR 25 Class 5 radiated emissions limits.

Use Scenario: Generates isolated 5 V/3 A auxiliary supply for digital I/O modules in factory automation cabinets with 24 V DC bus.

IC Role / Device Role / Timing Role: High-efficiency step-down converter replacing linear regulators; operates continuously under 40°C ambient with forced air cooling.

Use Value: 150 mΩ R_DS(on) and PFM mode maintain >88% efficiency at 100 mA load, reducing heat sink size and system power loss.

Portable Medical Diagnostic Device

Smart Building Sensor Node

Use Scenario: Powers FPGA, ADC, and wireless SoC in handheld ultrasound unit powered by Li-ion battery (8–12.6 V).

IC Role / Device Role / Timing Role: Main power management IC enabling battery runtime extension and low-noise analog supply generation.

Use Value: Programmable 2–4 MHz switching avoids interference with ultrasonic transducer frequencies; ceramic-stable design eliminates audible coil whine.

Use Scenario: Supplies 1.8 V/500 mA rail to BLE MCU and environmental sensors in battery-operated HVAC node with 10-year target lifetime.

IC Role / Device Role / Timing Role: Ultra-low-IQ buck regulator managing deep-sleep and active burst modes in energy-harvesting constrained design.

Use Value: 30 µA operational IQ and hiccup-mode fault recovery enable reliable autonomous operation without service intervention.

Equivalent & Alternatives

The following parts are listed as comparable options for similar buck regulator applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
LM5164QPWPRQ1	4.5–65 V input, 1.5 A output, no integrated MOSFET (external high-side FET required), 500 kHz–2.2 MHz programmable frequency	Requires external MOSFET and gate driver; higher VIN range but lower current capability	Select when input exceeds 36 V or when discrete FET optimization is needed for thermal partitioning.
MPQ4420AGL-A	3.3–36 V input, 2 A output, 120 mΩ MOSFET, 200 kHz–2.5 MHz frequency, no PFM or dithering	Lacks frequency dithering and PFM; smaller current rating; no AEC-Q100 qualification	Choose for cost-sensitive non-automotive applications where EMI headroom exists and light-load efficiency is secondary.

Compared with LM5164QPWPRQ1 and MPQ4420AGL-A, the A8586KLJTR-T-1 delivers higher output current (3.5 A vs. ≤2 A), integrated EMI mitigation (dithering + slew control), and automotive qualification - making it optimal for space- and reliability-constrained 12/24 V systems needing single-chip simplicity.

Availability

A8586KLJTR-T-1 is available at Aetrix Electronics and suitable for automotive body electronics, industrial programmable logic controllers, and portable medical devices requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant sourcing.

Supply support for A8586KLJTR-T-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 U.S.-based designer of high-performance power ICs and magnetic sensors, specializing in automotive-grade motor drivers, regulators, and current sensors since 1989.

The A8586 family is engineered for high-voltage DC/DC conversion in harsh environments - targeting automotive infotainment, ADAS power domains, and industrial equipment where wide input range, low IQ, and EMI robustness are critical.

FAQ

What is the maximum switching frequency supported by the A8586KLJTR-T-1?

The A8586KLJTR-T-1 supports a programmable switching frequency up to 4 MHz via an external resistor (RFREQ) connected from the FREQ pin to GND. At 4 MHz, minimum on-time (80 ns) and off-time (100 ns) constraints apply; operation above 2 MHz requires careful attention to input/output voltage ratios to avoid pulse skipping. The default factory-trimmed oscillator is 2 MHz, and dithering (±8%) remains active across the full range.

Does the A8586KLJTR-T-1 support PFM mode for light-load efficiency?

Yes, the A8586KLJTR-T-1 includes PFM mode, which activates automatically when load current drops below ~800 mA. In PFM, the SW node is tri-stated to minimize switching and gate driver losses, achieving 30 µA quiescent current. This feature is disabled in A8586-1 and A8586-2 variants - confirming A8586KLJTR-T-1 is the PFM-enabled version per Allegro's part numbering scheme (no suffix = standard A8586).

What package type does the A8586KLJTR-T-1 use, and how is thermal performance characterized?

The A8586KLJTR-T-1 uses the 8-pin SOIC package with exposed thermal pad (LJ suffix). Its junction-to-ambient thermal resistance (R_θJA) is 35°C/W on a standard 4-layer JEDEC PCB. The exposed pad must be soldered to a large copper pour for effective heat transfer; Allegro recommends ≥250 mm² thermal pad area with ≥4 thermal vias to inner ground planes.

How does the A8586KLJTR-T-1 handle overcurrent and short-circuit faults?

The A8586KLJTR-T-1 employs cycle-by-cycle current limiting (4.0–5.5 A threshold) followed by hiccup-mode protection. Upon sustained overcurrent, it disables switching for 6 ms, then retries soft-start. It also monitors BOOT capacitor integrity (hiccup after 7 cycles if open) and freewheeling diode status (hiccup after one open/short event), ensuring robust fault recovery without latch-up or manual reset.

Is the A8586KLJTR-T-1 qualified for automotive applications?

Yes, the A8586KLJTR-T-1 is AEC-Q100 Grade 1 qualified (−40°C to +125°C ambient, TJ up to 150°C), with built-in protections including VIN UVLO, thermal shutdown (170°C), pin-to-ground short tolerance, and EMI-optimized features like frequency dithering and controlled switch-node slew rates - meeting requirements for body electronics, infotainment, and ADAS subsystems.

A8586KLJTR-T-1 Specifications

Product attributes: Attribute value

Manufacturer:: Allegro MicroSystems

Series:: -

Package/Case:: 8-SOIC (0.154", 3.90mm Width) Exposed Pad

Packaging:: Tape & Reel (TR)

Product Status:: Active

Function:: Step-Down

Output Configuration:: Positive

Topology:: Buck

Output Type:: Adjustable

Number of Outputs:: 1

Voltage - Input (Min):: 3.8V

Voltage - Input (Max):: 36V

Voltage - Output (Min/Fixed):: 0.8V

Voltage - Output (Max):: 30V

Current - Output:: 3.5A

Frequency - Switching:: 200kHz ~ 4MHz

Synchronous Rectifier:: No

Operating Temperature:: -40°C ~ 150°C (TJ)

Grade:: Automotive

Qualification:: AEC-Q100

Mounting Type:: Surface Mount

Supplier Device Package:: 8-SOIC-EP

A8586KLJTR-T-1 FAQ

1.How can I place an order for A8586KLJTR-T-1 through Aetrix?

Please submit a Request for Quotation (RFQ) for A8586KLJTR-T-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 A8586KLJTR-T-1 reliable?

The price and inventory of A8586KLJTR-T-1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for A8586KLJTR-T-1 is usually 5 days.

3.What payment methods are accepted for A8586KLJTR-T-1?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for A8586KLJTR-T-1 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for A8586KLJTR-T-1?

A8586KLJTR-T-1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your A8586KLJTR-T-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 A8586KLJTR-T-1?

For technical support, including A8586KLJTR-T-1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your A8586KLJTR-T-1 requirements.

6.How does Aetrix verify that A8586KLJTR-T-1 is sourced from the original manufacturer or authorized distributors?

All A8586KLJTR-T-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 A8586KLJTR-T-1 meets industry standards.

7.What is the process for return or replacement of A8586KLJTR-T-1?

All A8586KLJTR-T-1 units undergo pre-shipment inspection (PSI). If there is an issue with A8586KLJTR-T-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 A8586KLJTR-T-1 part is unused and in its original packaging.

Return procedure for A8586KLJTR-T-1:

1.Submit a request within 90 days.

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

Tech Hub

2026-09-08 Obsolete Electronic Components: How to Source and Evaluate Replacements

A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.

2026-09-07 TTL vs CMOS Logic Levels: 74HC and 74HCT Compatibility Explained

TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.

2026-09-04 Logic Level Shifter: How to Connect 3.3V and 5V Logic Safely

A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.

2026-09-03 74HC595 vs TPIC6B595: Output Drive, Pinout, Current, and Load Selection

The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…

2026-09-02 74HC595 Pinout, Timing, Output Current, and Applications

The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…

2026-09-01 Latch vs Flip-Flop: Timing, Differences and Design Choices

A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…

2026-08-30 D Latch Circuit: Truth Table, Timing, ICs and Applications

A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …

2026-08-28 SR Latch Explained: NOR and NAND Circuits, Truth Tables, and Applications

An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…

2026-08-27 Latch Circuit: SR and D Latches, Truth Tables, Timing, and Applications

Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…

2026-08-21 What Is an LED Driver? Types, Circuits, Dimming, and Selection

An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…