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Allegro MicroSystems A8586KLJTR-T
- Part No.:
- A8586KLJTR-T
- Manufacturer:
- Allegro MicroSystems
- Package:
- 8-SOIC (0.154", 3.90mm Width) Exposed Pad
- Datasheet:
-
A8586KLJTR-T.pdf
- Description:
- IC REG BUCK ADJ 3.5A 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,799
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Product details
Overview
A8586KLJTR-T 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, adjustable 0.8–30 V output voltage, and programmable switching frequency up to 4 MHz - designed for automotive power conversion in 12 V/24 V battery systems.
For engineers reviewing the A8586KLJTR-T datasheet, A8586KLJTR-T pinout, A8586KLJTR-T application, or A8586KLJTR-T equivalent, key selection considerations include its AEC-Q100 qualification, PFM-enabled low-quiescent-current operation (30 µA), frequency dithering for EMI reduction, and SOIC-8 thermal-pad package compatibility with industrial and automotive PCB layouts.
Technical Context
The A8586KLJTR-T implements peak-current-mode PWM control with internal slope compensation (3.1 A/µs at 2 MHz), enabling stable operation at duty cycles >50% across wide VIN/VOUT ratios. Its transconductance error amplifier (60 µA/V typ.) interfaces with external RC compensation on the COMP pin for loop stability.
It integrates protection logic including cycle-by-cycle overcurrent detection (4.0–5.5 A limit), hiccup-mode short-circuit recovery (6 ms off-time), BOOT capacitor fault detection (7-cycle missing, 120-cycle shorted), and freewheeling diode open/short monitoring - all operating without external components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.8 V to 36 V - supports direct connection to automotive battery rails including cold-crank (6 V) and load-dump (36 V) transients. |
| Output Current | Up to 3.5 A continuous - limited by internal 150 mΩ MOSFET RDS(on) and thermal resistance of 35 °C/W (SOIC-8 LJ package). |
| Switching Frequency | Programmable 0.2–4 MHz via FREQ pin resistor - enables EMI-sensitive band avoidance (e.g., AM radio, ADSL) and optimization for size vs. efficiency. |
| Quiescent Current | 30 µA typical in active PFM mode - extends battery runtime in always-on vehicle modules like telematics or ADAS sensors. |
| Feedback Reference | 0.792 V ±1.5% (25°C), 0.773–0.812 V (–40°C to 125°C) - sets output accuracy for precision 3.3 V or 5 V rail generation with standard resistor dividers. |
| Protection Features | UVLO (3.0 V start, 0.4 V hysteresis), thermal shutdown (170°C), BOOT fault detection, freewheeling diode fault detection, and hiccup-mode OCP - eliminates need for external supervision ICs. |
| EMI Mitigation | Frequency dithering (±8% sweep at 12 kHz rate), controlled switch-node slew rates, soft freewheel diode turn-off - reduces peak radiated emissions without added filtering. |
Pinout & Package
Package: 8-pin SOIC with exposed thermal pad (suffix LJ), JEDEC-standard footprint, 35 °C/W junction-to-ambient thermal resistance on 4-layer PCB.
| 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 thermal and EMI performance. |
| EN | Enable input | High-voltage (40 V rated) logic input; rising threshold 1.5 V (±0.35 V); enables automatic startup when tied to VIN or system-controlled sequencing. |
| COMP | Error amplifier output | Compensation node for current-mode loop; requires external RZCZ network to GND - determines phase margin and transient response bandwidth. |
| FB | Feedback input | Inverting input of transconductance error amplifier; senses divided output voltage - sets regulation point via resistor divider (RFB1/RFB2). |
| GND | Power and signal ground | Common reference for control circuitry and power stage; must be connected to exposed thermal pad for thermal and noise integrity. |
| FREQ | Frequency setting | Connects to GND via RFREQ resistor (e.g., 45.3 kΩ for 2 MHz); sets oscillator frequency and influences minimum on-time constraints. |
| VIN | Main power input | Drain of internal MOSFET and supply for control circuits; accepts 3.8–36 V; requires local 10 µF ceramic capacitor placed adjacent to pin. |
| BST | Bootstrap capacitor terminal | Connects to SW via 100 nF ceramic capacitor; supplies gate drive voltage for high-side MOSFET - no series resistor recommended. |
Key Features
| Feature | Design Value |
|---|---|
| Pulse-frequency modulation (PFM) | Enables 30 µA quiescent current at light loads while maintaining regulation - critical for battery-powered automotive modules with intermittent wake-up cycles. |
| Frequency dithering | ±8% triangular sweep at 12 kHz modulates switching spectrum - reduces peak EMI by >10 dB compared to fixed-frequency operation in CISPR 25 Class 5 testing. |
| Internal slope compensation | 3.1 A/µs at 2 MHz, scaling with fSW - ensures stable current-mode control at >50% duty cycle without external compensation components. |
| Ceramic-capacitor stable | Supports low-ESR MLCC output capacitors without requiring tantalum or polymer types - lowers BOM cost and improves reliability in temperature-cycled environments. |
| Pre-biased startup | Prevents reverse current flow into pre-charged output rails - avoids damaging downstream circuitry during hot-plug or multi-rail sequencing scenarios. |
Applications
| Automotive Infotainment Power Supply | ADAS Camera Module DC/DC |
|---|---|
|
Use Scenario: Powers 3.3 V and 5 V rails for display controllers, audio codecs, and USB hubs in head units under 12 V battery input with load-dump immunity. IC Role / Device Role / Timing Role: Primary buck regulator providing regulated, low-noise, AEC-Q100-compliant power with dithering to meet CISPR 25 radiated emissions limits. Use Value: Eliminates need for post-regulation LDOs due to tight 0.792 V reference tolerance and <1% output ripple at full load - reduces board area and thermal load. |
Use Scenario: Supplies 1.8 V core and 3.3 V I/O rails to image sensors and ISP processors in rear-view or surround-view cameras exposed to –40°C to 105°C ambient. IC Role / Device Role / Timing Role: High-efficiency, thermally robust buck converter with thermal shutdown (170°C) and hiccup-mode fault recovery for unattended operation. Use Value: Maintains >92% efficiency at 1 A load across temperature via PFM/PWM seamless transition - extends camera uptime during extended parking mode. |
| Industrial PLC I/O Module | Telematics Control Unit (TCU) |
|
Use Scenario: Generates isolated 5 V and 12 V auxiliary rails from 24 V DC bus in programmable logic controllers with surge and reverse-polarity protection. IC Role / Device Role / Timing Role: Wide-input buck regulator with UVLO hysteresis (0.4 V) and pin-to-ground short survivability - meets IEC 61000-4-5 Level 4 surge immunity requirements. Use Value: Integrated MOSFET and protection reduce component count by 6+ parts versus discrete controller + external FET solutions - improves MTBF and simplifies certification. |
Use Scenario: Powers LTE modem, GNSS receiver, and CAN transceiver in vehicle connectivity units operating continuously on 12 V battery with sleep-mode current budget <50 µA. IC Role / Device Role / Timing Role: Low-IQ buck regulator with 30 µA operational current and EN-controlled shutdown - enables <100 µA system standby with fast wake-up. Use Value: PFM coast mode reduces light-load losses by >4× versus forced-PWM alternatives - extends TCU battery backup time during ignition-off periods. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MPQ4420AGL-A-Z | 40 V max input, 2 A output, no integrated PFM, fixed 500 kHz/2 MHz options only | Lacks frequency dithering and AEC-Q100 qualification; requires external compensation | Lower-cost option for non-automotive industrial use where EMI and qualification are not required. |
| LM61480QRNXTQ1 | 42 V max input, 8 A output, pin-compatible SOIC-8, includes spread-spectrum clocking but no PFM | Higher current rating and wider input range, but 50 µA quiescent current vs. 30 µA; no light-load PFM mode | Better for high-current automotive applications needing >3.5 A, but less optimal for ultra-low-power always-on subsystems. |
Compared with MPQ4420AGL-A-Z and LM61480QRNXTQ1, the A8586KLJTR-T uniquely combines AEC-Q100 qualification, 30 µA PFM operation, and ±8% frequency dithering in an SOIC-8 package - making it the only choice for cost-sensitive, EMI-constrained automotive modules requiring both low IQ and robust EMC performance.
Availability
A8586KLJTR-T is available at Aetrix Electronics and suitable for automotive infotainment systems, ADAS camera modules, and industrial PLC I/O power supplies requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant sourcing.
Supply support for A8586KLJTR-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 semiconductor company specializing in high-performance power ICs, magnetic sensors, and motor driver solutions for automotive and industrial markets.
The A8586 family is engineered for high-reliability automotive power conversion - targeting 12 V/24 V battery-fed systems requiring AEC-Q100 compliance, low EMI, and extended temperature operation from –40°C to 150°C junction.
FAQ
What is the maximum output current capability of the A8586KLJTR-T?
The A8586KLJTR-T delivers up to 3.5 A continuous output current under thermal-limited conditions. This is enabled by its integrated 150 mΩ high-side MOSFET and 35 °C/W junction-to-ambient thermal resistance in the SOIC-8 LJ package. Actual achievable current depends on ambient temperature, PCB layout, and input/output voltage differential - for example, at 12 VIN/3.3 VOUT, full 3.5 A is sustainable with adequate copper area and airflow.
Does the A8586KLJTR-T support programmable switching frequency, and how is it set?
Yes, the A8586KLJTR-T supports programmable switching frequency from 0.2 MHz to 4 MHz using an external resistor (RFREQ) connected between the FREQ pin and GND. For instance, a 45.3 kΩ resistor sets 2 MHz operation. The relationship is nonlinear and documented in Table 1 of the datasheet; values outside the recommended range may cause instability or violate minimum on-time constraints (80 ns).
Is the A8586KLJTR-T qualified for automotive applications?
Yes, the A8586KLJTR-T is AEC-Q100 qualified (Grade 1: –40°C to 125°C ambient). It includes automotive-grade protections such as pin-to-ground short survivability, freewheeling diode fault detection, BOOT capacitor monitoring, and thermal shutdown with 20°C hysteresis - all validated per AEC-Q100 stress test requirements.
How does the PFM mode operate in the A8586KLJTR-T, and what is its benefit?
The A8586KLJTR-T uses PFM mode below ~800 mA load to reduce switching losses and achieve 30 µA quiescent current. When FB voltage rises above the PFM threshold (~1% above PWM setpoint), the SW node is tri-stated and the device draws minimal current. Upon FB drop, it resumes PWM after a 2.5 µs delay. This extends battery life in always-on automotive modules without sacrificing regulation accuracy.
What package type and thermal characteristics does the A8586KLJTR-T use?
The A8586KLJTR-T uses an 8-pin SOIC package with exposed thermal pad (suffix LJ), offering 35 °C/W junction-to-ambient thermal resistance on a standard 4-layer JEDEC PCB. The exposed pad must be soldered to a large copper plane for optimal thermal performance. This package enables drop-in replacement for legacy SOIC-based buck regulators while supporting higher power density than DFN alternatives in space-constrained designs.
A8586KLJTR-T 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 FAQ
1.How can I place an order for A8586KLJTR-T through Aetrix?
Please submit a Request for Quotation (RFQ) for A8586KLJTR-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 A8586KLJTR-T reliable?
The price and inventory of A8586KLJTR-T 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 is usually 5 days.
3.What payment methods are accepted for A8586KLJTR-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for A8586KLJTR-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for A8586KLJTR-T?
A8586KLJTR-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your A8586KLJTR-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 A8586KLJTR-T?
For technical support, including A8586KLJTR-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your A8586KLJTR-T requirements.
6.How does Aetrix verify that A8586KLJTR-T is sourced from the original manufacturer or authorized distributors?
All A8586KLJTR-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 A8586KLJTR-T meets industry standards.
7.What is the process for return or replacement of A8586KLJTR-T?
All A8586KLJTR-T units undergo pre-shipment inspection (PSI). If there is an issue with A8586KLJTR-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 A8586KLJTR-T part is unused and in its original packaging.
Return procedure for A8586KLJTR-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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