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Allegro MicroSystems A8586KEJTR-T-2
- Part No.:
- A8586KEJTR-T-2
- Manufacturer:
- Allegro MicroSystems
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
A8586KEJTR-T-2.pdf
- Description:
- IC REG BUCK ADJ 3.5A 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,808
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Product details
Overview
A8586KEJTR-T-2 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 operates with programmable switching frequency up to 4 MHz, features PFM mode for light-load efficiency, and is AEC-Q100 qualified for automotive power conversion.
For engineers reviewing the A8586KEJTR-T-2 datasheet, A8586KEJTR-T-2 pinout, A8586KEJTR-T-2 application, or A8586KEJTR-T-2 equivalent, key selection considerations include its DFN-10 package with exposed thermal pad, 30 μA quiescent current, frequency dithering for EMI reduction, and PFM-enabled efficiency optimization in battery-powered systems.
Technical Context
The A8586KEJTR-T-2 implements current-mode PWM control with internal slope compensation enabling stable operation at duty cycles >50%, supported by a transconductance error amplifier (60 µA/V typical gm) and fixed soft-start ramp (1.5 ms). Its architecture integrates a bootstrap gate driver, internal LDO (~2.9 V), and cycle-by-cycle overcurrent protection with hiccup-mode recovery.
It supports programmable oscillator via external RFREQ resistor (e.g., 45.3 kΩ sets 2 MHz), includes VIN UVLO (3.0 V start, 0.4 V hysteresis), thermal shutdown (170°C typ), and comprehensive fault detection: BOOT open/short, freewheel diode open/short, and overvoltage protection with automatic recovery.
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 rails without pre-regulation. |
| Output Current | Up to 3.5 A - sufficient for powering microcontrollers, sensors, and interface ICs in distributed power systems. |
| Switching Frequency | Programmable up to 4 MHz - allows operation outside AM/ADSL EMI bands and supports compact magnetics. |
| Quiescent Current | 30 µA typical - extends battery life in always-on vehicle modules and portable equipment. |
| MOSFET RDS(on) | 150 mΩ - reduces conduction loss and thermal stress at full load, improving efficiency at mid-to-high loads. |
| Feedback Reference | 0.792 V ±1.3% - enables precise output regulation with standard resistor dividers and low-output-voltage designs. |
| Thermal Resistance | RθJA = 45 °C/W (DFN-10 on 4-layer PCB) - defines maximum power dissipation before derating; requires thermal pad soldering for rated performance. |
Pinout & Package
Package: 10-pin DFN with exposed thermal pad (suffix EJ), 3 mm × 3 mm footprint, 0.5 mm pitch, designed for high-power density and thermal reliability in space-constrained automotive and industrial PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (Pins 1,2) | Switch node | Source of internal high-side MOSFET; connects directly to inductor and freewheel diode cathode - must be routed with wide, low-inductance traces to minimize EMI and voltage spikes. |
| EN (Pin 3) | Enable input | High-voltage logic input (40 V tolerant); rising threshold 1.5 V - allows direct connection to VIN for auto-enable or microcontroller GPIO control. |
| COMP (Pin 4) | Error amplifier output | Compensation node for current-mode loop; requires external RC network (RZ/CZ) to GND - determines stability margin and transient response speed. |
| FB (Pin 5) | Feedback input | Inverting input of error amplifier; senses divided output voltage - sets regulated VOUT = 0.792 V × (1 + RFB1/RFB2) with <1% reference accuracy. |
| GND (Pin 6) | Power and signal ground | Common return for control circuitry and power stage - must be connected to thermal pad and low-impedance ground plane to ensure noise immunity and thermal performance. |
| FREQ (Pin 7) | Oscillator programming | Connects to GND via RFREQ resistor - selects switching frequency from 0.2 MHz to 4 MHz; value directly determines EMI profile and inductor size. |
| VIN (Pins 8,9) | Main power input | Drain of internal MOSFET and supply for control circuits - requires local 10 µF ceramic capacitor to suppress high-frequency ripple and maintain stability. |
| BST (Pin 10) | Bootstrap capacitor connection | Drives high-side gate via charge pump; requires 100 nF ceramic capacitor to SW - critical for MOSFET turn-on; open/short detection prevents latch-up. |
Key Features
| Feature | Design Value |
|---|---|
| Frequency dithering (±8%) | Reduces peak EMI amplitude by spreading spectral energy across 12 kHz modulation bandwidth - aids EMC compliance without added filtering components. |
| Pulse-frequency modulation (PFM) | Enables <30 µA light-load operation by disabling switching and tri-stating SW node - eliminates switching losses and maintains >85% efficiency at 1 mA load. |
| Ceramic capacitor stability | Supports low-ESR MLCCs without external compensation - simplifies BOM and layout while enabling fast transient response and compact output filtering. |
| Integrated protection suite | Includes hiccup-mode OCP, BOOT fault detection, freewheel diode monitoring, VIN UVLO, and thermal shutdown - eliminates need for external supervision ICs in safety-critical applications. |
| Pre-biased startup | Prevents reverse current into pre-charged output capacitors - avoids damaging downstream loads during hot-plug or rail sequencing scenarios. |
Applications
| Automotive Infotainment Power Supply | Industrial PLC I/O Module |
|---|---|
Use Scenario: Powers display controller, audio codec, and CAN transceiver in head unit with 12 V battery input and strict EMI limits. IC Role / Device Role / Timing Role: Primary buck regulator providing 3.3 V/2.5 A with dithering and 4 MHz switching to avoid AM band interference. Use Value: Eliminates need for external EMI filters and reduces solution size by 35% vs. discrete MOSFET+controller designs. | Use Scenario: Supplies isolated sensor interface and microcontroller in DIN-rail mounted PLC with 24 V DC field power. IC Role / Device Role / Timing Role: High-input-voltage buck converter delivering 5 V/3 A with UVLO hysteresis and thermal foldback for unregulated industrial rails. Use Value: Maintains regulation down to 3.8 V input and survives 40 V load-dump transients without latch-up or reset. |
| Battery-Powered Telematics Unit | Distributed Telecom Power Node |
Use Scenario: Powers GPS module, cellular modem, and MCU in fleet-tracking device powered by Li-ion (8–16 V) with 10-year battery life target. IC Role / Device Role / Timing Role: Efficiency-optimized buck regulator using PFM mode at sleep currents <10 mA and PWM at active loads. Use Value: Achieves 30 µA quiescent current and >92% efficiency at 100 mA, extending runtime by 2.1× vs. non-PFM alternatives. | Use Scenario: Generates 12 V intermediate rail from 48 V telecom backplane for PoE switch controllers and PHYs. IC Role / Device Role / Timing Role: High-voltage step-down regulator with 36 V max input rating and 150 mΩ MOSFET for minimal dropout at full load. Use Value: Supports >94% efficiency at 3.5 A/12 V output with no external heat sink required due to DFN-10 thermal pad. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MPQ4333GQ-AEC1-Z | 40 V max input, 3.5 A, 2.5 MHz fixed frequency, no PFM, AEC-Q100 Grade 1 | Lacks light-load PFM; higher IQ (45 µA); no frequency dithering or pre-biased startup | Preferred when fixed-frequency EMI predictability outweighs PFM efficiency gains and dithering is unnecessary. |
| TPS54332DR | 28 V max input, 3.5 A, 1 MHz fixed frequency, 75 µA IQ, no AEC-Q100 qualification | Lower input voltage ceiling; no automotive qualification; lacks BOOT/freewheel diode fault detection | Suitable for cost-sensitive industrial applications where AEC-Q100 and 36 V input are not required. |
Compared with MPQ4333GQ-AEC1-Z and TPS54332DR, the A8586KEJTR-T-2 uniquely combines 36 V input capability, 30 µA PFM operation, frequency dithering, and full automotive fault coverage - making it optimal for next-generation vehicle ECUs requiring both efficiency and robustness.
Availability
A8586KEJTR-T-2 is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial PLC I/O modules, battery-powered telematics units, and distributed telecom power nodes requiring stable component supply across extended temperature and lifecycle demands.
Supply support for A8586KEJTR-T-2 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 drivers for automotive and industrial markets.
The A8586 product line delivers wide-input, high-efficiency buck regulators engineered for automotive AEC-Q100 compliance, EMI-sensitive environments, and demanding thermal conditions in engine control, ADAS, and body electronics.
FAQ
What is the maximum input voltage rating for the A8586KEJTR-T-2?
The A8586KEJTR-T-2 has an absolute maximum input voltage rating of 40 V, with recommended operating range from 3.8 V to 36 V. This allows direct integration into 24 V industrial systems and 12 V automotive architectures, including tolerance for load-dump transients up to 40 V without damage or latch-up, provided external TVS protection is used per design guidelines.
Does the A8586KEJTR-T-2 support pre-biased output startup?
Yes, the A8586KEJTR-T-2 supports pre-biased startup: when the FB pin senses a non-zero voltage at enable, the COMP pin remains low and SW is tri-stated until the internal soft-start voltage exceeds the sensed FB voltage. This prevents reverse current flow into pre-charged output capacitors - a critical feature for hot-swap and rail-sequencing applications where output voltage may already be present.
How does the PFM mode function in the A8586KEJTR-T-2?
The A8586KEJTR-T-2 enters PFM mode when load current drops below ~800 mA and FB voltage rises above the PFM comparator threshold (≈1% above 0.792 V). In this state, the SW node is tri-stated, drawing only 30 µA from VIN. When FB falls below threshold, the device fully powers up after ~2.5 µs and resumes PWM operation - enabling >90% efficiency at light loads while maintaining tight output regulation.
What package type is used for the A8586KEJTR-T-2?
The A8586KEJTR-T-2 uses a 10-pin DFN package with exposed thermal pad (suffix EJ), measuring 3 mm × 3 mm with 0.5 mm pitch. This package provides superior thermal performance (RθJA = 45 °C/W on JEDEC 4-layer board) and high power density compared to SOIC-8 variants, making it ideal for space-constrained automotive and industrial PCB layouts requiring efficient heat dissipation.
Is frequency dithering enabled on the A8586KEJTR-T-2?
Yes, frequency dithering is enabled on the A8586KEJTR-T-2. It modulates the switching frequency ±8% around the programmed value using an internal 12 kHz triangle waveform - reducing peak EMI amplitude and easing compliance with CISPR 25 Class 5 requirements in automotive applications without adding external spread-spectrum circuitry.
A8586KEJTR-T-2 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Allegro MicroSystems
- Series:
- -
- Package/Case:
- 10-WFDFN Exposed Pad
- Packaging:
- Bulk
- 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:
- Up to 4MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-DFN (3x3)
A8586KEJTR-T-2 FAQ
1.How can I place an order for A8586KEJTR-T-2 through Aetrix?
Please submit a Request for Quotation (RFQ) for A8586KEJTR-T-2 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-2 reliable?
The price and inventory of A8586KEJTR-T-2 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-2 is usually 5 days.
3.What payment methods are accepted for A8586KEJTR-T-2?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for A8586KEJTR-T-2 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for A8586KEJTR-T-2?
A8586KEJTR-T-2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your A8586KEJTR-T-2 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-2?
For technical support, including A8586KEJTR-T-2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your A8586KEJTR-T-2 requirements.
6.How does Aetrix verify that A8586KEJTR-T-2 is sourced from the original manufacturer or authorized distributors?
All A8586KEJTR-T-2 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-2 meets industry standards.
7.What is the process for return or replacement of A8586KEJTR-T-2?
All A8586KEJTR-T-2 units undergo pre-shipment inspection (PSI). If there is an issue with A8586KEJTR-T-2, 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-2 part is unused and in its original packaging.
Return procedure for A8586KEJTR-T-2:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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