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Allegro MicroSystems A8582KLPTR-T
- Part No.:
- A8582KLPTR-T
- Manufacturer:
- Allegro MicroSystems
- Package:
- 16-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
A8582KLPTR-T.pdf
- Description:
- IC REG BUCK ADJ 2A 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,273
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Product details
Overview
A8582KLPTR-T from Allegro MicroSystems is an automotive-grade, asynchronous buck PWM regulator integrating a 70 mΩ high-side N-channel MOSFET, supporting 4.7–36 V input, 0.8 V adjustable output, ≥2.0 A continuous load, and 0.25–2.4 MHz externally adjustable switching frequency - used in GPS/infotainment power rails requiring robust surge tolerance and pre-bias startup.
For engineers reviewing the A8582KLPTR-T datasheet, A8582KLPTR-T pinout, A8582KLPTR-T application, or A8582KLPTR-T equivalent, key selection criteria include its AEC-Q100 qualification, 3 μA sleep current, POK output with 90% VREF threshold, hiccup-mode OCP, and TSSOP-16 exposed-pad thermal performance under automotive ambient conditions.
Technical Context
The A8582KLPTR-T employs current-mode control with internal slope compensation scaled to fSW, enabling stable operation up to 90% duty cycle across wide VIN/VOUT ratios and inductor values. Its transconductance error amplifier (gm = 750 μA/V typ) features dual-input "analog OR" logic for soft-start and regulation, with COMP pin sinking via 1.5 kΩ during fault.
It integrates unique protection architecture: missing-diode detection, pin-to-ground short tolerance on all terminals, open-circuit and adjacent-pin short immunity, plus UVLO (3.8 V stop), OVP (114% VREF), TSD (150°C), and pulse-by-pulse OCP (3.25 A typ). The low-side MOSFET (10 Ω) charges BOOT only when needed - not every cycle - improving light-load efficiency.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.7 V to 36 V - supports automotive battery transients including 40 V surge testing without external clamping. |
| Output Current | ≥2.0 A continuous - sustained at full load with thermal derating per RθJA = 34 °C/W on 4-layer JEDEC PCB. |
| Switching Frequency | 0.25–2.4 MHz adjustable via FSET resistor - enables EMI optimization and compact magnetics design. |
| Feedback Reference | 800 mV ±1% - sets minimum output voltage to 0.8 V with standard resistor divider; enables precise low-VOUT regulation. |
| Sleep Supply Current | <3 μA at TJ ≤ 85°C - enables ultra-low-power standby in always-on automotive modules. |
| Power OK Threshold | 90% of VREF (720 mV) - asserts POK after 7 PWM cycles when FB reaches regulation window, ensuring reliable system sequencing. |
| Thermal Shutdown | 150°C activation with 20°C hysteresis - latches off until junction cools below 130°C, preventing thermal runaway. |
Pinout & Package
Package: 16-pin TSSOP with exposed thermal pad (LP suffix), RoHS-compliant, matte tin leadframe, designed for enhanced heat dissipation via ≥6 vias to GND plane.
| 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 circuitry. |
| SS (4) | Soft-start timing & hiccup period control | Capacitor-connected node sourcing 20 μA at startup; discharge current sets hiccup retry interval. |
| GND (5,12) | Signal and power ground reference | Low-impedance return path for control logic, current sense, and thermal pad connection. |
| POK (6) | Open-drain Power OK indicator | Asserts high-Z when FB within ±10% of 800 mV; requires external pull-up for system power sequencing. |
| EN/SYNC (7) | Enable logic input / external clock sync | Logic-high (>1.65 V) enables operation; accepts 1.2× to 1.5× fSW external clock after soft-start completion. |
| FSET (8) | Switching frequency programming | Resistor-to-GND sets fSW from 250 kHz to 2.4 MHz; 1% tolerance recommended for accuracy. |
| FB (9) | Negative feedback input | Senses output voltage via resistive divider; regulates to 800 mV; supports pre-bias startup. |
| FBX (10) | OVP comparator remote sense | Configures overvoltage trip point as % of VREF; grounded if OVP disabled. |
| COMP (11) | Error amplifier output & loop compensation | Connects RC network to GND for Type II/III compensation; pulled to GND via 1.5 kΩ during fault. |
| BOOT (14) | High-side gate drive bootstrap supply | Drives HS MOSFET gate; requires 100 nF ceramic capacitor to SW for charge replenishment. |
| SW (15,16) | Switch node & HS MOSFET source | Connects to external diode cathode and inductor; high dV/dt node requiring tight layout and Kelvin routing. |
| PAD | Exposed thermal pad | Mandatory connection to PCB ground plane via ≥6 thermal vias; primary path for junction-to-board heat transfer. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 1 qualification | Validated for –40°C to +125°C ambient operation - meets automotive reliability and stress test requirements. |
| Asynchronous topology with boot-gated HS FET | Eliminates need for synchronous rectifier driver; 70 mΩ RDS(on) enables high-efficiency mid-load operation. |
| Pre-bias startup capability | Adapts soft-start sequence when VOUT is pre-charged - prevents reverse current and output collapse. |
| Missing-diode (D1) protection | Detects open external freewheeling diode and disables switching - prevents catastrophic failure during diode failure. |
| Pin-fault tolerant design | All pins withstand short-to-ground, open-circuit, and adjacent-pin shorts - enhances field robustness in harsh environments. |
| Stable with ceramic output capacitors | No ESR requirement - enables use of low-ESR, high-reliability MLCCs without stability compromise. |
Applications
| GPS/Infotainment Power Rail | Automobile Audio Amplifier Supply |
|---|---|
Use Scenario: Powers RF front-end and baseband processors in automotive navigation systems exposed to cold-crank (4.7 V) and load-dump (40 V) events. IC Role / Device Role / Timing Role: Primary DC-DC step-down regulator delivering stable 3.3 V or 5 V from battery rail; manages inrush during hot-plug USB-C connectivity. Use Value: AEC-Q100 qualification ensures functional safety; 2.4 MHz switching allows small 2.2 µH inductor; POK output coordinates SoC reset sequencing. |
Use Scenario: Supplies Class D audio amplifier ICs in head-unit or rear-seat entertainment systems requiring low-noise, fast-transient response. IC Role / Device Role / Timing Role: High-current buck converter regulating 12 V battery to 9 V amplifier rail; handles dynamic load steps from 100 mA to 2 A. Use Value: Current-mode control delivers <10 µs transient recovery; hiccup-mode OCP prevents thermal damage during speaker short; soft-start eliminates pop noise. |
| Home Audio DSP Power | Network Equipment PoE Midspan |
Use Scenario: Powers digital signal processors and DACs in premium home theater receivers where EMI must meet CISPR-22 Class B limits. IC Role / Device Role / Timing Role: Adjustable-frequency buck regulator enabling spread-spectrum-like EMI reduction via 0.25–2.4 MHz tuning. Use Value: External frequency synchronization allows alignment with system clock to avoid beat frequencies; ceramic-capacitor stability simplifies layout. |
Use Scenario: Generates auxiliary bias rails (e.g., 3.3 V, 5 V) in IEEE 802.3at PoE midspan injectors operating from 48–57 V DC input. IC Role / Device Role / Timing Role: Wide-input buck controller stepping down PoE-derived voltage while surviving 100 V transients per IEC 61000-4-5. Use Value: 40 V absolute max VIN rating and robust pin-fault tolerance protect against PoE surge coupling; low 3.5 mA no-load current improves idle efficiency. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar asynchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM5164QPWPRQ1 | 40 V max VIN, 1 A rated, integrated sync FET, 0.35–2.2 MHz, no POK or missing-diode protection | Requires external diode for async mode; lacks automotive-specific fault tolerance and hiccup configuration | Choose for cost-sensitive 1 A designs needing synchronous efficiency; avoid where AEC-Q100 or diode-failure resilience is mandatory. |
| MPQ4420AGL-A | 36 V max VIN, 2 A rated, 0.3–2.5 MHz, no EN/SYNC sync function, no FBX OVP pin, 500 mV ref | Lacks remote OVP sensing and external clock sync; lower reference voltage limits low-VOUT precision | Select when board space is constrained (QFN-10) and sync is unnecessary; verify OVP implementation separately if required. |
Compared with LM5164QPWPRQ1 and MPQ4420AGL-A, the A8582KLPTR-T uniquely combines AEC-Q100 qualification, missing-diode protection, programmable hiccup behavior, and dedicated FBX OVP sensing - making it optimal for mission-critical automotive power rails where fault coverage and regulatory compliance are non-negotiable.
Availability
A8582KLPTR-T is available at Aetrix Electronics and suitable for GPS/infotainment, automobile audio, and network equipment power conversion requiring stable component supply, automotive-grade reliability, and long-term lifecycle support.
Supply support for A8582KLPTR-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 drivers for automotive and industrial markets.
The A8582 belongs to Allegro's automotive-qualified DC-DC regulator product line, engineered specifically for demanding vehicle subsystems requiring robust transient handling, comprehensive fault protection, and seamless integration into ASIL-B–capable power architectures.
FAQ
What is the maximum input voltage rating for the A8582KLPTR-T, and how does it handle automotive load dump?
The A8582KLPTR-T has an absolute maximum VIN rating of 40 V, exceeding standard ISO 7637-2 Load Dump Pulse 5a (35 V, 400 ms). Its internal circuitry remains functional up to 36 V continuous operation, and the 40 V rating allows direct connection to automotive battery rails without external TVS clamping in most cases - validated per AEC-Q100 stress testing protocols.
Does the A8582KLPTR-T support pre-biased output startup, and how does it behave during this condition?
Yes, the A8582KLPTR-T supports pre-biased startup. When VOUT is pre-charged, the FB pin senses the existing voltage, and the soft-start sequence delays COMP release until VSS reaches ~VFB + 330 mV. This prevents reverse current flow through the external diode and avoids output voltage collapse - critical for hot-swap and multi-rail sequencing applications.
How is the switching frequency set on the A8582KLPTR-T, and what is the accuracy over temperature?
The A8582KLPTR-T switching frequency is set by a resistor (RFSET) from the FSET pin to GND, supporting 250 kHz to 2.4 MHz. Frequency accuracy is ±12% over –40°C to +125°C ambient, with typical variation of ±5% at 25°C. A 1% tolerance resistor is recommended to minimize deviation, and the FSET vs. fSW curve is provided in the datasheet Design section.
What protection features distinguish the A8582KLPTR-T from generic buck controllers?
The A8582KLPTR-T includes automotive-specific protections absent in generic controllers: missing external diode (D1) detection, pin-to-ground short tolerance on every terminal, adjacent-pin short immunity, and configurable hiccup-mode OCP with user-defined retry count. These features ensure fail-safe behavior in harsh automotive environments where wiring faults or component degradation are common failure modes.
Can the A8582KLPTR-T be synchronized to an external clock, and what are the timing constraints?
Yes, the A8582KLPTR-T accepts external synchronization on the EN/SYNC pin after soft-start completion. The input clock must operate between 1.2× and 1.5× the base fSW (set by RFSET), with ≤80% duty cycle, ≥200 ns pulse width, and ≤15 ns rise/fall times. Synchronization begins only once VFB exceeds the POK threshold (90% VREF), ensuring stable lock-in.
A8582KLPTR-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Allegro MicroSystems
- Series:
- -
- Package/Case:
- 16-TSSOP (0.173", 4.40mm 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):
- 4.7V
- Voltage - Input (Max):
- 36V
- Voltage - Output (Min/Fixed):
- 0.8V
- Voltage - Output (Max):
- 36V
- Current - Output:
- 2A
- Frequency - Switching:
- 250kHz ~ 2.45MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-eTSSOP-EP
A8582KLPTR-T FAQ
1.How can I place an order for A8582KLPTR-T through Aetrix?
Please submit a Request for Quotation (RFQ) for A8582KLPTR-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 A8582KLPTR-T reliable?
The price and inventory of A8582KLPTR-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for A8582KLPTR-T is usually 5 days.
3.What payment methods are accepted for A8582KLPTR-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for A8582KLPTR-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for A8582KLPTR-T?
A8582KLPTR-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your A8582KLPTR-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 A8582KLPTR-T?
For technical support, including A8582KLPTR-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your A8582KLPTR-T requirements.
6.How does Aetrix verify that A8582KLPTR-T is sourced from the original manufacturer or authorized distributors?
All A8582KLPTR-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 A8582KLPTR-T meets industry standards.
7.What is the process for return or replacement of A8582KLPTR-T?
All A8582KLPTR-T units undergo pre-shipment inspection (PSI). If there is an issue with A8582KLPTR-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 A8582KLPTR-T part is unused and in its original packaging.
Return procedure for A8582KLPTR-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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