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Allegro MicroSystems A8580KLPTR-T
- Part No.:
- A8580KLPTR-T
- Manufacturer:
- Allegro MicroSystems
- Package:
- 16-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
A8580KLPTR-T.pdf
- Description:
- IC REG BUCK ADJ 2.5A 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,511
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Product details
Overview
A8580KLPTR-T from Allegro MicroSystems is an automotive-grade asynchronous buck regulator designed for car audio and infotainment power supplies. It delivers up to 2.5 A output current, supports 4.0–35 V input voltage range, operates in PWM/PFM/sleep modes, and features ±1.0% output voltage accuracy (0°C to 85°C), 250 kHz–2.4 MHz programmable switching frequency, and active-low NPOR output. It is used in instrument clusters and navigation systems requiring low-quiescent-current standby.
For engineers reviewing the A8580KLPTR-T datasheet, A8580KLPTR-T pinout, A8580KLPTR-T application, or A8580KLPTR-T equivalent, key selection criteria include its AEC-Q100 qualification, 110 mΩ integrated high-side MOSFET, ultra-low 5 µA sleep-mode supply current at 85°C, external synchronization capability via PWM/PFMn pin, and thermal shutdown protection at 170°C.
Technical Context
The A8580KLPTR-T implements current-mode control with transconductance error amplifier (gm = 750 µA/V typ), slope compensation scalable with fOSC, and pulse-by-pulse overcurrent protection. Its PWM/PFMn pin serves dual function: logic-level mode selection and external clock synchronization input (fSYNC up to 2.9 MHz).
It integrates a 110 mΩ high-side N-channel MOSFET and requires external asynchronous diode and bootstrap capacitor. The device uses external compensation (RZ/CZ/CP network) and supports pre-biased startup, hiccup-mode short-circuit recovery, and robust fault handling including BOOT open/short, VIN UVLO (3.6 V start), and VOUT OVP (880 mV threshold).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.0 V to 35 V - supports wide automotive battery transients including cold-crank and load-dump conditions. |
| Max Output Current | 2.5 A - limited by thermal design; derates to ~1.8 A at 85°C ambient on JEDEC 4-layer PCB (RθJA = 34°C/W). |
| Switching Frequency | 250 kHz to 2.4 MHz - set by RFSET resistor; enables EMI optimization and small external component selection. |
| Feedback Accuracy | ±1.0% (0°C to 85°C) - ensures stable 3.3 V or 5.0 V rail regulation for DSPs and microcontrollers. |
| Sleep Mode Current | <5 µA at 85°C - enables always-on keep-alive functionality in infotainment head units without draining battery. |
| NPOR Output | Active-low open-drain with 7.5 ms delay - provides reliable power-on reset signal for downstream logic after VOUT regulation is achieved. |
| Protection Features | Pulse-by-pulse OCP, hiccup-mode short circuit, BOOT OV/UV, VOUT OVP/UVP, thermal shutdown (170°C), and pin-to-pin short detection - satisfies ASIL-B system-level FMEA requirements. |
Pinout & Package
Package: 16-pin TSSOP with exposed thermal pad (suffix LP); RoHS-compliant, lead-free, matte-tin plated.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (pins 1, 2) | Main power input | Supplies control circuitry and high-side MOSFET drain; accepts 4–35 V with surge tolerance up to 40 V. |
| SW (pins 14, 15) | Switch node | Connects to external inductor and freewheeling diode; high dv/dt node requiring tight layout and low-inductance routing. |
| GND (pins 5, 13) | Power and signal ground | Dual ground pins reduce ground bounce; exposed thermal pad must be connected to PCB ground plane via ≥6 vias. |
| BOOT (pin 16) | High-side gate drive boost | Requires 47 nF ceramic capacitor to SW; regulates internal high-side driver voltage (4.1 V enable threshold). |
| FB (pin 10) | Feedback input | Monitors output voltage via resistor divider; reference is 800 mV ±1.0% - sets VOUT = 800 mV × (1 + RFB1/RFB2). |
| COMP (pin 9) | Error amplifier output | External compensation node; connects RZ–CZ–CP network to stabilize current-mode loop across full load/temperature range. |
| PWM/PFMn (pin 6) | Mode control & sync input | Logic-high = PWM mode; logic-low = Low-IQ PFM; external clock >1.2×fOSC forces synchronization - no additional sync pin required. |
| SLEEPn (pin 4) | Shutdown enable | Active-low; <0.5 V forces ultra-low-power sleep (<10 µA total); >2.1 V required for normal operation. |
| NPOR (pin 7) | Power-on reset output | Open-drain, active-low; transitions high-impedance after 7.5 ms once VOUT reaches regulation - drives external MCU reset pin. |
| FSET (pin 8) | Frequency setting | Resistor to GND sets base fOSC (e.g., 59 kΩ → 425 kHz); enables precise EMI tuning without changing layout. |
| SS (pin 3) | Soft-start/hiccup timing | Capacitor to GND sets soft-start ramp time (880 µs typical) and hiccup period during overcurrent faults. |
| BIAS (pin 11) | Bias supply input | Accepts 3.2–5.5 V external bias to improve efficiency; bypassed internally if left unconnected (VREG used instead). |
| VREG (pin 12) | LDO bypass | Internal 3.05 V LDO output; requires 1 µF ceramic capacitor to GND for stability of internal regulators. |
Key Features
| Feature | Design Value |
|---|---|
| Automotive AEC-Q100 Grade 1 | Qualified for –40°C to +125°C ambient operation - meets reliability requirements for front-end infotainment ECUs. |
| Low-IQ PFM Mode | Draws ≤50 µA at 12 VIN/3.3 VOUT with 40 µA load - sustains microcontroller RTC and wake-up circuitry during vehicle sleep. |
| Integrated 110 mΩ High-Side MOSFET | Eliminates external high-side switch; reduces BOM count and layout area while maintaining 2.5 A capability at moderate duty cycles. |
| External Synchronization via PWM/PFMn | Removes need for dedicated SYNC pin - simplifies multi-rail timing alignment in complex audio SoC power trees. |
| Pre-biased Startup Capability | Starts cleanly into pre-charged output capacitors - prevents reverse current flow and avoids system reset during hot-plug or brown-out recovery. |
| Robust Fault Protection Set | Includes BOOT OV/UV, asynchronous diode open/short detection, and pin-fault tolerant logic - reduces need for external supervision ICs. |
Applications
| Instrument Clusters | Car Audio Amplifiers |
|---|---|
Use Scenario: Powering digital gauges, TFT displays, and CAN interface controllers in modern digital dashboards. IC Role / Device Role / Timing Role: Primary 5.0 V/2.5 A buck regulator supplying display driver ICs and microcontroller cores. Use Value: ±1.0% VOUT accuracy ensures consistent LCD brightness and ADC reference stability across temperature; NPOR guarantees deterministic boot sequence. | Use Scenario: Generating clean 3.3 V rail for DSPs and Class-D amplifier controllers in premium head units. IC Role / Device Role / Timing Role: High-efficiency synchronous buck controller with low-noise PFM mode for standby audio processing. Use Value: 50 µA PFM quiescent current extends battery life during vehicle-off state; 2.4 MHz capability allows use of 2.2 µH inductors for compact layout. |
| Navigation Systems | HVAC Control Modules |
Use Scenario: Supplying GPS modules, touch-screen controllers, and wireless connectivity ICs in embedded navigation units. IC Role / Device Role / Timing Role: Wide-input buck regulator supporting 12 V battery and 24 V commercial vehicle variants. Use Value: 4.0–35 V input range accommodates 24 V truck systems and handles 40 V load-dump transients without external TVS. | Use Scenario: Providing regulated 3.3 V for HVAC microcontrollers and sensor interfaces in climate control ECUs. IC Role / Device Role / Timing Role: Always-on power source with sleep mode triggered by vehicle ignition status. Use Value: <5 µA sleep current prevents parasitic drain; SLEEPn pin direct connection to ignition-switched 12 V eliminates need for auxiliary logic. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| A8586KEJTR-T | Successor part with improved thermal performance (RθJA = 28°C/W), higher 3.0 A rating, and enhanced EMI behavior; pin-compatible but requires updated RFSET and compensation values. | Designed for next-gen infotainment with higher compute loads; supports same 4–35 V input and AEC-Q100 Grade 1. | Select A8586KEJTR-T for new designs requiring higher current or lower thermal resistance; not recommended for legacy A8580 footprint reuse without validation. |
| MPQ4333GQ-AEC1 | Monolithic 3 A buck with integrated MOSFETs; fixed 500 kHz/2.2 MHz options; lacks NPOR and external sync via mode pin; different pinout and compensation scheme. | Targeted at general automotive body electronics; no Low-IQ PFM mode - minimum IQ is 35 µA (vs. 5 µA sleep for A8580). | Consider MPQ4333GQ-AEC1 only when NPOR and ultra-low sleep current are not required; requires full schematic and layout revision. |
Compared with A8586KEJTR-T and MPQ4333GQ-AEC1, the A8580KLPTR-T uniquely combines ultra-low 5 µA sleep current, NPOR output, and external synchronization on a single mode pin - making it optimal for cost-sensitive, space-constrained infotainment subsystems where deterministic reset and battery preservation are critical.
Availability
A8580KLPTR-T is available at Aetrix Electronics and suitable for automotive instrument clusters, car audio amplifiers, and navigation systems requiring stable component supply despite end-of-life status.
Supply support for A8580KLPTR-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 designer and manufacturer of high-performance power ICs and magnetic sensors for automotive and industrial applications.
The A8580 belongs to Allegro's automotive power management product line, engineered specifically for demanding car audio and infotainment systems requiring wide-input operation, ultra-low standby power, and robust fault resilience.
FAQ
Is the A8580KLPTR-T still in production?
No, the A8580KLPTR-T is discontinued per Allegro's official product status update dated September 30, 2024. It is no longer in production, samples are unavailable, and new designs should transition to the recommended substitution A8586KEJTR-T. However, Aetrix Electronics maintains legacy inventory and offers lifecycle support for existing production programs using the A8580KLPTR-T.
What is the maximum output current the A8580KLPTR-T can deliver reliably?
The A8580KLPTR-T is rated for up to 2.5 A output current under optimized thermal conditions (e.g., 4-layer JEDEC PCB, 200 LFM airflow). Actual deliverable current depends on VIN, VOUT, switching frequency, and PCB thermal design - for example, at 12 VIN/3.3 VOUT and 425 kHz, it supports ~2.2 A at 85°C ambient; at 2 MHz, derating increases due to higher switching losses. Thermal shutdown triggers at 170°C junction temperature.
How does the A8580KLPTR-T achieve ultra-low sleep current?
The A8580KLPTR-T achieves <5 µA sleep current (at 85°C, 16 VIN) by disabling all switching activity, turning off internal regulators, and placing the high-side MOSFET in deep cutoff. Only essential bias circuitry remains active, and MOSFET leakage is limited to 10 µA max at 16 VIN. The SLEEPn pin must be driven below 0.5 V to activate this state, and the device exits sleep within 103 µs of SLEEPn rising above 1.3 V.
Can the A8580KLPTR-T synchronize to an external clock?
Yes, the A8580KLPTR-T supports external synchronization via the PWM/PFMn pin: applying a clock signal >1.2× the base fOSC (e.g., >500 kHz for a 425 kHz design) forces the PWM frequency to lock to the incoming clock. This eliminates beat frequencies in multi-rail systems and simplifies EMI filtering - no separate SYNC pin or external logic is needed. Synchronization is disabled during PFM or sleep modes.
What protection features does the A8580KLPTR-T include?
The A8580KLPTR-T integrates comprehensive protection: pulse-by-pulse current limit (4.1 A typ), hiccup-mode short-circuit recovery, BOOT overvoltage/undervoltage detection, asynchronous diode open/short fault sensing, VIN undervoltage lockout (3.6 V start), VOUT overvoltage (880 mV) and undervoltage (740 mV) protection, and thermal shutdown at 170°C. All protections are auto-recovering unless latched by sustained fault conditions.
A8580KLPTR-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:
- Obsolete
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4V
- Voltage - Input (Max):
- 35V
- Voltage - Output (Min/Fixed):
- 0.8V
- Voltage - Output (Max):
- 10V
- Current - Output:
- 2.5A
- Frequency - Switching:
- 252kHz ~ 2.44MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-eTSSOP-EP
A8580KLPTR-T FAQ
1.How can I place an order for A8580KLPTR-T through Aetrix?
Please submit a Request for Quotation (RFQ) for A8580KLPTR-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 A8580KLPTR-T reliable?
The price and inventory of A8580KLPTR-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for A8580KLPTR-T is usually 5 days.
3.What payment methods are accepted for A8580KLPTR-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for A8580KLPTR-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for A8580KLPTR-T?
A8580KLPTR-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your A8580KLPTR-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 A8580KLPTR-T?
For technical support, including A8580KLPTR-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your A8580KLPTR-T requirements.
6.How does Aetrix verify that A8580KLPTR-T is sourced from the original manufacturer or authorized distributors?
All A8580KLPTR-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 A8580KLPTR-T meets industry standards.
7.What is the process for return or replacement of A8580KLPTR-T?
All A8580KLPTR-T units undergo pre-shipment inspection (PSI). If there is an issue with A8580KLPTR-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 A8580KLPTR-T part is unused and in its original packaging.
Return procedure for A8580KLPTR-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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