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Allegro MicroSystems A8586KEJTR-T
- Part No.:
- A8586KEJTR-T
- Manufacturer:
- Allegro MicroSystems
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
A8586KEJTR-T.pdf
- Description:
- IC REG BUCK ADJ 3.5A 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,355
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Product details
Overview
A8586KEJTR-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 across 3.8–36 V input range and supporting adjustable 0.8–30 V output voltage. It features programmable switching frequency up to 4 MHz, 30 μA quiescent current, and AEC-Q100 qualification for automotive power systems.
For engineers reviewing the A8586KEJTR-T datasheet, A8586KEJTR-T pinout, A8586KEJTR-T application, or A8586KEJTR-T equivalent, key selection criteria include PFM-enabled light-load efficiency, frequency dithering for EMI reduction, thermal shutdown at 170°C, hiccup-mode short-circuit protection, and DFN-10 package compatibility with high-power-density PCB layouts.
Technical Context
The A8586KEJTR-T implements fixed-frequency PWM control with cycle-by-cycle current limiting and internal slope compensation enabling stable operation above 50% duty cycle across wide VIN/VOUT ratios. Its transconductance error amplifier (60 µA/V typ.) interfaces with external RC compensation on the COMP pin for robust loop stability.
It integrates a bootstrap gate driver with dedicated BST pin, monitors BOOT capacitor health, detects freewheeling diode open/short faults, and enforces VIN undervoltage lockout (3.0 V start, 0.4 V hysteresis) and overvoltage protection independent of feedback loop status.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.8 V to 36 V - supports direct connection to 12 V/24 V automotive batteries and industrial rails without pre-regulation |
| Output Current | Up to 3.5 A - sufficient for powering microcontrollers, sensors, and communication ICs in embedded systems |
| Switching Frequency | Programmable up to 4 MHz via FREQ pin resistor - enables compact magnetics and avoids AM/ADSL EMI bands |
| Quiescent Current | 30 µA typical - extends battery life in always-on vehicle modules and IoT edge nodes |
| MOSFET RDS(on) | 150 mΩ - minimizes conduction loss at full load, reducing thermal stress in DFN-10 package |
| Feedback Reference | 0.792 V ±1.2% - enables precise output regulation with standard resistor dividers and low-output-capacitance stability |
| Thermal Shutdown | 170°C with 20°C hysteresis - protects against sustained overload or poor heatsinking in enclosed environments |
Pinout & Package
Package: 10-pin DFN with exposed thermal pad (suffix EJ), optimized for high-power density and thermal performance on 4-layer PCBs (RθJA = 45°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (Pins 1,2) | Switch node | Source of internal high-side MOSFET; connects directly to inductor and freewheeling diode cathode - requires shortest possible trace routing |
| EN (Pin 3) | 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 |
| COMP (Pin 4) | Error amplifier output | Compensation node for current-mode loop; accepts series RC network to GND for stability tuning |
| FB (Pin 5) | Feedback input | Inverting input of transconductance amplifier; senses divided output voltage to regulate VOUT to 0.792 V reference |
| GND (Pin 6) | Power ground | Main return path for control circuitry and high-current SW node - must connect to exposed thermal pad |
| FREQ (Pin 7) | Frequency setting | Connects to GND via RFREQ resistor to program switching frequency from 0.2 MHz to 4 MHz |
| VIN (Pins 8,9) | Power input | Drain of internal MOSFET and supply for control circuits; requires local 10 µF ceramic capacitor to GND |
| BST (Pin 10) | Bootstrap capacitor | Connects to SW via 100 nF capacitor; supplies gate drive voltage >VIN for high-side MOSFET turn-on |
Key Features
| Feature | Design Value |
|---|---|
| Frequency dithering | ±8% triangular sweep at 12 kHz - reduces peak EMI amplitude by spreading spectral energy across narrow band |
| Pulse-frequency modulation (PFM) | Active only in A8586 variant - enables <30 µA light-load operation while maintaining regulation via SW node tri-state |
| Comprehensive fault protection | Includes hiccup-mode short-circuit, BOOT capacitor fault detection, freewheeling diode open/short, VIN UVLO, and thermal shutdown |
| Ceramic capacitor stability | No minimum ESR requirement - supports low-profile, high-reliability MLCCs without external damping components |
| Pre-biased startup | Prevents output discharge during hot-insertion - holds SW tri-state until soft-start voltage exceeds pre-existing FB voltage |
| Low dropout operation | Maximized duty cycle with frequency foldback - sustains regulation during input brownout or high-VOUT conditions |
Applications
| Automotive Body Control Module | Industrial PLC I/O Power Supply |
|---|---|
Use Scenario: Powers MCU, CAN transceiver, and sensor interface in door module with 12 V battery input subject to load dump and cold crank. IC Role / Device Role / Timing Role: Primary buck regulator providing stable 3.3 V/5 V rail with AEC-Q100 compliance and 36 V transient tolerance. Use Value: 30 µA quiescent current prevents battery drain during vehicle sleep mode; frequency dithering meets CISPR 25 Class 5 radiated emissions limits. |
Use Scenario: Generates isolated 24 V-to-5 V power for digital input/output cards in factory automation cabinets. IC Role / Device Role / Timing Role: High-efficiency step-down converter operating from wide-range industrial 24–36 V DC bus. Use Value: 3.5 A output supports multiple downstream LDOs; hiccup-mode protection prevents thermal runaway during field-wiring faults. |
| Portable Medical Instrument | Telematics Control Unit (TCU) |
Use Scenario: Powers ARM Cortex-M7 processor and analog front-end in handheld ultrasound device powered by Li-ion battery pack. IC Role / Device Role / Timing Role: Main system regulator delivering 1.2 V core and 3.3 V I/O rails with dynamic voltage scaling support. Use Value: Programmable 2–4 MHz switching enables optimal trade-off between inductor size and light-load efficiency; PFM extends runtime per charge cycle. |
Use Scenario: Supplies 5 V rail to LTE modem, GNSS receiver, and secure element in automotive TCU with CAN/FlexRay connectivity. IC Role / Device Role / Timing Role: Primary DC/DC converter handling 12 V automotive input with EMI-hardened design for co-location with RF sections. Use Value: Controlled switch-node slew rates and 4 MHz fundamental frequency avoid interference with cellular/GNSS bands; AEC-Q100 ensures functional safety compliance. |
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 PFM, no dithering, QFN-10 package | Lacks AEC-Q100 qualification and light-load efficiency optimization | Preferred for cost-sensitive industrial applications where EMI and ultra-low IQ are not critical |
| LM61480RQR | 36 V max input, 8 A output, 2.1 MHz fixed frequency, no PFM, SO-16 package | Higher current rating but larger footprint and higher quiescent current (15 µA sleep, 4 mA active) | Selected when board space permits larger package and higher output current is required |
Compared with MPQ4420AGL-A-Z and LM61480RQR, the A8586KEJTR-T uniquely combines AEC-Q100 qualification, 30 µA quiescent current, frequency dithering, and PFM operation in a thermally enhanced DFN-10 package - making it optimal for automotive and battery-critical designs requiring EMI robustness and standby efficiency.
Availability
A8586KEJTR-T is available at Aetrix Electronics and suitable for automotive body electronics, industrial PLC power supplies, portable medical instrumentation, and telematics control units requiring stable component supply and long-term production continuity.
Supply support for A8586KEJTR-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 product line delivers high-efficiency, high-voltage buck regulators engineered for demanding automotive environments - emphasizing AEC-Q100 reliability, EMI resilience, and wide-input flexibility in compact packages.
FAQ
What is the maximum switching frequency supported by the A8586KEJTR-T?
The A8586KEJTR-T supports a programmable switching frequency up to 4 MHz, set by an external resistor (RFREQ) from the FREQ pin to GND. At 4 MHz, minimum on-time (80 ns) and off-time (100 ns) constraints require careful attention to VIN/VOUT ratio to avoid pulse skipping - refer to Figure 3 in the datasheet for recommended operating boundaries.
Does the A8586KEJTR-T support pre-biased output startup?
Yes, the A8586KEJTR-T supports pre-biased startup: when the output is already charged, the COMP pin remains low and the SW node stays tri-stated until the internal soft-start voltage ramps above the existing FB voltage. This prevents reverse current flow and output capacitor discharge during hot-insertion scenarios.
How does the A8586KEJTR-T implement overvoltage protection (OVP)?
The A8586KEJTR-T features always-on OVP that monitors VOUT independently of the feedback loop. If VOUT rises above threshold due to high-side MOSFET leakage or light-load conditions, the high-side switch is forced off while the low-side path remains active to pull down excess voltage - enabling automatic recovery once the fault condition clears.
What thermal derating applies to the A8586KEJTR-T in its DFN-10 package?
The A8586KEJTR-T in DFN-10 (EJ) package has a junction-to-ambient thermal resistance (RθJA) of 45°C/W on a JEDEC-standard 4-layer PCB. Derating begins above 125°C junction temperature; full 3.5 A output is guaranteed only below 100°C ambient with adequate copper area and airflow - consult Allegro's thermal application notes for layout guidelines.
Is the A8586KEJTR-T pin-compatible with other variants like A8586-1 or A8586-2?
Yes, the A8586KEJTR-T shares identical pinout and package with A8586-1KEJTR-T and A8586-2KEJTR-T. Functional differences - such as PFM disable (A8586-1), dithering disable (A8586-1), or PFM-only disable (A8586-2) - are implemented internally and do not affect physical layout or external circuitry.
A8586KEJTR-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Allegro MicroSystems
- Series:
- -
- Package/Case:
- 10-WFDFN 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:
- 10-DFN (3x3)
A8586KEJTR-T FAQ
1.How can I place an order for A8586KEJTR-T through Aetrix?
Please submit a Request for Quotation (RFQ) for A8586KEJTR-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 A8586KEJTR-T reliable?
The price and inventory of A8586KEJTR-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for A8586KEJTR-T is usually 5 days.
3.What payment methods are accepted for A8586KEJTR-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for A8586KEJTR-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for A8586KEJTR-T?
A8586KEJTR-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your A8586KEJTR-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 A8586KEJTR-T?
For technical support, including A8586KEJTR-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your A8586KEJTR-T requirements.
6.How does Aetrix verify that A8586KEJTR-T is sourced from the original manufacturer or authorized distributors?
All A8586KEJTR-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 A8586KEJTR-T meets industry standards.
7.What is the process for return or replacement of A8586KEJTR-T?
All A8586KEJTR-T units undergo pre-shipment inspection (PSI). If there is an issue with A8586KEJTR-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 A8586KEJTR-T part is unused and in its original packaging.
Return procedure for A8586KEJTR-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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