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Allegro MicroSystems A8584KLPTR-T
- Part No.:
- A8584KLPTR-T
- Manufacturer:
- Allegro MicroSystems
- Package:
- -
- Datasheet:
-
A8584KLPTR-T.pdf
- Description:
- IC REG BUCK ADJ 2.5A TSSOP
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Inventory:4,200
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Product details
Overview
A8584KLPTR-T from Allegro MicroSystems is an automotive-grade, asynchronous buck PWM regulator with integrated 100 mΩ high-side N-channel MOSFET, supporting 4.7–36 V input, 0.8 V adjustable output, 2.5 A load current, and 250–500 kHz externally adjustable switching frequency - used in GPS/infotainment power rails.
For engineers reviewing the A8584KLPTR-T datasheet, A8584KLPTR-T pinout, A8584KLPTR-T application, or A8584KLPTR-T equivalent, this page delivers verified technical context, real-world design meaning of key specs (e.g., 3 μA sleep current, ±1.5% reference accuracy, hiccup-mode OCP), and validated alternative options for automotive DC-DC conversion.
Technical Context
The A8584KLPTR-T employs current-mode control with external slope compensation to ensure stable operation up to 90% duty cycle across wide VIN/VOUT ratios and temperature (–40°C to +125°C). Its transconductance error amplifier (750 μA/V typ) and programmable soft-start (via CSS) enable robust pre-bias startup and fast transient response.
It integrates dual protection logic: pulse-by-pulse overcurrent detection (3.25 A typ) coupled with hiccup-mode recovery (7-event latch, 235 mV SS reset threshold), plus thermal shutdown (150°C trip), UVLO (3.8 V stop), and full pin-level short-to-ground tolerance - meeting AEC-Q100 Grade 1 requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.7–36 V - supports automotive battery transients including 40 V surge testing without external clamping. |
| Output Current | 2.5 A continuous - delivered via internal 100 mΩ high-side MOSFET; enables compact layout without external switch. |
| Reference Voltage | 800 mV ±1.5% - sets minimum output at 0.8 V with precision feedback divider design. |
| Switching Frequency | 250–500 kHz (adjustable via RFSET) - balances EMI control and inductor size; synchronizable up to 750 kHz. |
| Sleep Current | <3 μA - reduces standby power in always-on automotive modules (e.g., telematics, ADAS sensors). |
| Protection Features | Pulse-by-pulse OCP, hiccup-mode short-circuit, thermal shutdown, UVLO, and pin-level short-to-GND tolerance - eliminates need for external fault management circuitry. |
| Package | 16-pin TSSOP with exposed thermal pad - achieves 34°C/W θJA on 4-layer PCB for reliable 2.5 A operation at 125°C ambient. |
Pinout & Package
Package: 16-pin TSSOP (LP suffix), lead-free with 100% matte tin plating and exposed thermal pad (PAD) requiring ≥6 vias to GND plane for thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (1,2,3) | Power input & high-side MOSFET drain | Accepts 4.7–36 V; requires local ceramic decoupling; supplies gate drive and control logic. |
| SS (4) | Soft-start timing node | Capacitor-connected pin controlling ramp time (tSS ≈ 880 μs @ 22 nF) and hiccup period. |
| GND (5,10,12) | Signal and power ground | Low-impedance return path for control, power, and compensation circuits; connects to PAD. |
| POK (6) | Open-drain Power OK indicator | Signals regulation status (90% VREF threshold); requires external pull-up for system sequencing. |
| EN/SYNC (7) | Enable & external clock input | Logic-controlled startup (1.65 V high threshold) and synchronization (1.2×–1.5× fSW range). |
| FSET (8) | Frequency setting resistor node | Resistor-to-GND sets fSW (250–500 kHz); 1% tolerance recommended for stability. |
| FB (9) | Negative feedback input | Monitors output via resistive divider; regulates to 800 mV reference with ±150 nA bias current. |
| COMP (11) | Error amplifier output & loop compensation | Connect RC network here for current-mode loop stability; pulled low (1500 Ω) during fault. |
| BOOT (14) | High-side gate drive boost supply | Charged via internal low-side FET only when needed; requires 100 nF ceramic cap to SW. |
| SW (15,16) | Switch node & high-side source | Connects to inductor and freewheeling diode; handles high dI/dt; routed with wide copper. |
| PAD | Exposed thermal pad | Mandatory GND connection via ≥6 vias; primary path for heat dissipation (RθJA = 34°C/W). |
Key Features
| Feature | Design Value |
|---|---|
| Automotive AEC-Q100 qualified | Grade 1 (–40°C to +125°C TA) - certified for under-hood and infotainment applications without derating. |
| Externally adjustable compensation | COMP pin accepts RC network - enables optimization for diverse output capacitors (including ceramics) and load dynamics. |
| Pre-bias startup support | Adapts soft-start sequence when VOUT is pre-charged - prevents reverse current and output collapse during hot-swap events. |
| Asynchronous architecture with boot efficiency | Low-side FET activates only to charge BOOT capacitor - eliminates unnecessary conduction loss and improves light-load efficiency. |
| Robust pin-level fault tolerance | All pins withstand short-to-GND, adjacent-pin shorts, and open-circuit faults - reduces need for external protection components. |
Applications
| GPS/Infotainment Power Supply | Automobile Audio Amplifier Rail |
|---|---|
|
Use Scenario: Provides stable 5 V or 3.3 V rail for navigation processors, display controllers, and cellular modems in automotive head units. IC Role / Device Role / Timing Role: Primary step-down regulator converting 12 V battery to low-noise logic supply; manages load dump transients up to 40 V. Use Value: A8584KLPTR-T's 34°C/W thermal resistance and hiccup-mode protection ensure uninterrupted operation during engine cranking and cold-cranking conditions. |
Use Scenario: Generates clean 12 V bias for Class D audio amplifiers in premium vehicle sound systems. IC Role / Device Role / Timing Role: High-current buck controller delivering 2.5 A with <3 μA sleep current to meet EU CO2 emission standards for idle audio readiness. Use Value: A8584KLPTR-T's adjustable 250–500 kHz fSW allows EMI tuning to avoid AM band interference while maintaining small magnetics. |
| Home Audio Digital Signal Processor | Network Equipment PoE Midspan |
|
Use Scenario: Powers DSPs and DACs in high-fidelity home theater receivers requiring low-noise, tightly regulated 1.8 V or 1.2 V rails. IC Role / Device Role / Timing Role: Precision buck regulator using 800 mV ±1.5% reference and ceramic-cap-compatible loop for minimal output ripple. Use Value: A8584KLPTR-T's transconductance error amplifier (750 μA/V) and external compensation deliver >60° phase margin across line/load/temp variations. |
Use Scenario: Supplies auxiliary 5 V/2.5 A rail in IEEE 802.3af/at midspan PSEs where space-constrained board area limits discrete solutions. IC Role / Device Role / Timing Role: Integrated high-side switch buck regulator replacing controller + external MOSFET, reducing BOM count and layout complexity. Use Value: A8584KLPTR-T's 100 mΩ RDS(on) and 36 V max VIN simplify compliance with IEC 61000-4-5 surge testing for PoE infrastructure. |
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, integrated 0.57 Ω high-side FET; no POK or hiccup mode; requires external compensation. | Better suited for higher-input industrial applications; lacks automotive-grade hiccup and POK features critical for infotainment safety. | Select LM5164QPWPRQ1 only if input exceeds 36 V and hiccup-mode fault recovery is not required. |
| MPQ4420AGL-A-Z | 4–36 V input, 2 A, 110 mΩ high-side FET; includes POK but no sync input or soft-start adjust; fixed 500 kHz fSW. | Lower current rating and no frequency adjustment limit flexibility in EMI-sensitive audio designs; lacks EN/SYNC dual-function capability. | Choose MPQ4420AGL-A-Z only for cost-sensitive, non-synchronized 2 A applications where soft-start timing is not critical. |
Compared with LM5164QPWPRQ1 and MPQ4420AGL-A-Z, the A8584KLPTR-T uniquely combines 2.5 A capability, adjustable 250–500 kHz fSW, hiccup-mode OCP, and AEC-Q100 qualification - making it the only option qualified for automotive infotainment power rails requiring both reliability and design flexibility.
Availability
A8584KLPTR-T is available at Aetrix Electronics and suitable for GPS/infotainment, automobile audio, and network equipment requiring stable component supply, automotive qualification, and production-ready thermal performance.
Supply support for A8584KLPTR-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 and magnetic sensors for automotive and industrial markets.
The A8584 product line delivers wide-input, high-current asynchronous buck regulators optimized for automotive subsystems demanding AEC-Q100 compliance, robust fault handling, and minimal external component count.
FAQ
What is the maximum input voltage rating for the A8584KLPTR-T?
The A8584KLPTR-T has an absolute maximum VIN rating of 40 V, allowing it to withstand automotive load-dump transients without external protection. Its operational input range is 4.7–36 V, with UVLO stop at 3.8 V (typ) and start at 4.2 V (typ). This ensures reliable startup after cold-cranking and sustained operation during alternator overvoltage events.
Does the A8584KLPTR-T support pre-biased output startup?
Yes, the A8584KLPTR-T supports pre-biased startup: when VOUT is already charged, the device delays PWM initiation until VSS reaches ~VFB + 330 mV, preventing reverse current flow through the output capacitor. This behavior is confirmed in the Functional Description section and validated in Figure 7 of the datasheet.
How is the switching frequency set on the A8584KLPTR-T?
The A8584KLPTR-T switching frequency is set by connecting a resistor (RFSET) from the FSET pin to GND. With RFSET = 105 kΩ, fSW = 250 kHz (typ); values scale inversely - e.g., 52.3 kΩ yields ~500 kHz. The datasheet provides a graph and Equation 2 for precise selection, and recommends 1% tolerance resistors for stability.
What protection features does the A8584KLPTR-T include?
The A8584KLPTR-T includes pulse-by-pulse overcurrent protection (3.25 A typ), hiccup-mode short-circuit recovery (7-event latch), thermal shutdown (150°C trip), UVLO (3.8 V stop), and full pin-level short-to-ground tolerance. All protections are internal and require no external components - verified in the Protection Features section and Electrical Characteristics table.
Is the A8584KLPTR-T pin-compatible with other Allegro buck regulators?
No documented pin-compatible alternatives exist for the A8584KLPTR-T within Allegro's portfolio. Its 16-pin TSSOP layout with VIN (1,2,3), SW (15,16), and PAD grounding is unique to this family. Substitution requires PCB redesign; functional alternatives like LM5164QPWPRQ1 or MPQ4420AGL-A-Z have different pinouts and feature sets.
A8584KLPTR-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Allegro MicroSystems
- Series:
- *
- Package/Case:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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:
- -
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- -
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- -
- Supplier Device Package:
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A8584KLPTR-T FAQ
1.How can I place an order for A8584KLPTR-T through Aetrix?
Please submit a Request for Quotation (RFQ) for A8584KLPTR-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 A8584KLPTR-T reliable?
The price and inventory of A8584KLPTR-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for A8584KLPTR-T is usually 5 days.
3.What payment methods are accepted for A8584KLPTR-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for A8584KLPTR-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for A8584KLPTR-T?
A8584KLPTR-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your A8584KLPTR-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 A8584KLPTR-T?
For technical support, including A8584KLPTR-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your A8584KLPTR-T requirements.
6.How does Aetrix verify that A8584KLPTR-T is sourced from the original manufacturer or authorized distributors?
All A8584KLPTR-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 A8584KLPTR-T meets industry standards.
7.What is the process for return or replacement of A8584KLPTR-T?
All A8584KLPTR-T units undergo pre-shipment inspection (PSI). If there is an issue with A8584KLPTR-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 A8584KLPTR-T part is unused and in its original packaging.
Return procedure for A8584KLPTR-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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