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Allegro MicroSystems A8590KLPTR-T
- Part No.:
- A8590KLPTR-T
- Manufacturer:
- Allegro MicroSystems
- Package:
- 16-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
A8590KLPTR-T.pdf
- Description:
- IC REG BUCK ADJ 3A 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,718
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Product details
Overview
A8590KLPTR-T from Allegro MicroSystems is an automotive-grade asynchronous buck regulator delivering up to 3.0 A output current with ±1.0% output voltage accuracy (0°C to 85°C), 4.0–35 V input range, and programmable switching frequency from 250 kHz to 2.4 MHz. It integrates a 110 mΩ high-side MOSFET and supports Low-IQ PFM mode drawing ≤50 µA at 12 VIN/3.3 VOUT/40 µA load - enabling keep-alive power in car audio and infotainment systems during engine stop-start cycles.
For engineers reviewing the A8590KLPTR-T datasheet, A8590KLPTR-T pinout, A8590KLPTR-T application, or A8590KLPTR-T equivalent, key selection considerations include its AEC-Q100 qualification, ultra-low sleep current (<5 µA at 16 VIN, 85°C), NPOR open-drain reset output, external synchronization capability via PWM/PFM pin, and thermal shutdown at 170°C.
Technical Context
The A8590KLPTR-T employs current-mode control with transconductance error amplifier (750 µA/V typ), slope compensation scalable with fOSC, and pulse-by-pulse overcurrent protection triggering at 5.5 A (tON(MIN)). Its Idle/Stop-Start Recovery technique suppresses output overshoot during VIN recovery from sub-minimum conditions.
It features dual-mode operation: PWM mode (fixed-frequency, up to 2.4 MHz) and Low-IQ PFM mode (variable-frequency, <50 µA quiescent current), selected via logic-level PWM/PFM pin. SLEEP pin enables ultra-low-power shutdown (<10 µA total IIN), while NPOR provides active-low power-on reset validated by regulated VOUT.
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 (4.0 V) and load-dump (35 V). |
| Output Current | Up to 3.0 A - enabled by integrated 110 mΩ high-side MOSFET; derated per thermal design and PCB layout. |
| Output Voltage Accuracy | ±1.0% (0°C to 85°C) - ensures stable microcontroller/DSP supply under nominal operating conditions. |
| Quiescent Current (PFM) | ≤50 µA at 12 VIN/3.3 VOUT/40 µA - sustains critical subsystems during vehicle ignition-off states. |
| Sleep Mode Current | <5 µA internal + ≤10 µA MOSFET leakage at 16 VIN, 85°C - meets stringent automotive low-power requirements. |
| Switching Frequency Range | 250 kHz to 2.4 MHz - adjustable via RFSET resistor; enables EMI optimization and small external component selection. |
| NPOR Output | Active-low open-drain - asserts reset until VOUT stabilizes for ≥7.5 ms, ensuring reliable system boot sequencing. |
Pinout & Package
Package: 16-pin TSSOP with exposed thermal pad (suffix LP); RoHS-compliant, 100% matte-tin leadframe plating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (1,2) | Power input | Supplies control circuitry and high-side MOSFET drain; rated 4.0–35 V with 40 V surge tolerance. |
| SLEEP (4) | Shutdown control | Logic-high (>2.1 V) enables operation; logic-low forces ultra-low-current shutdown (VOUT = 0 V). |
| FB (10) | Feedback input | Monitors output via resistor divider; sets VOUT with 800 mV reference (±1.0% accuracy). |
| PWM/PFM (6) | Mode selection & sync input | Low = Low-IQ PFM; high = fixed-frequency PWM; external clock > fOSC synchronizes switching. |
| NPOR (7) | Reset output | Open-drain active-low signal asserting reset until VOUT remains regulated for ≥7.5 ms. |
| SW (14,15) | Switch node | Source of high-side MOSFET; connects to external diode and output inductor; requires low-inductance routing. |
| COMP (9) | Error amplifier output | Compensation node for current-mode loop; requires external RZ/CZ/CP network for stability. |
| BOOT (16) | High-side gate drive boost | Connects 47 nF ceramic capacitor to SW; enables N-channel MOSFET drive above VIN. |
Key Features
| Feature | Design Value |
|---|---|
| Automotive AEC-Q100 qualified | Rated for –40°C to 125°C ambient; validated for instrument clusters, audio, HVAC, and navigation systems. |
| Idle/Stop-Start Recovery | Actively suppresses VOUT overshoot when VIN recovers from dropout, eliminating need for external clamping. |
| External synchronization | PWM/PFM pin accepts external clock > fOSC to align switching frequency - reduces EMI in multi-rail systems. |
| Pre-biased startup capability | Starts safely into pre-charged output without causing reset or reverse current - critical for hot-swap applications. |
| Comprehensive fault protection | Includes pulse-by-pulse OCP, hiccup-mode short-circuit, BOOT OV/UV, VOUT OVP/UVP, thermal shutdown, and pin-fault robustness. |
Applications
| Instrument Clusters | Car Audio Systems |
|---|---|
Use Scenario: Powering digital gauges, TFT displays, and CAN interface ICs in modern digital dashboards during engine start-stop cycles. IC Role / Device Role / Timing Role: Primary 3.3 V/5.0 V buck regulator supplying microcontroller, display driver, and communication peripherals. Use Value: Low-IQ PFM mode maintains VOUT with ≤50 µA draw during stop events; NPOR ensures clean boot on restart. |
Use Scenario: Delivering stable 5 V or 6.5 V to DSPs, amplifiers, and Bluetooth modules in head units with extended idle periods. IC Role / Device Role / Timing Role: High-efficiency DC-DC converter supporting dynamic load steps from standby to full audio playback. Use Value: 3.0 A capability and 110 mΩ MOSFET enable high transient response; thermal shutdown protects during enclosure overheating. |
| Navigation Systems | HVAC Control Units |
Use Scenario: Providing regulated 3.3 V to GPS receivers, touch controllers, and Wi-Fi modules in infotainment head units with GPS always-on requirement. IC Role / Device Role / Timing Role: Always-on power rail generator with ultra-low sleep current (<5 µA) and fast wake-up from SLEEP pin assertion. Use Value: Sleep mode eliminates battery drain during vehicle off-state while enabling instant GPS lock on ignition. |
Use Scenario: Supplying 5 V to MCU, motor drivers, and sensor interfaces in climate control modules mounted near engine compartments. IC Role / Device Role / Timing Role: Robust buck regulator handling 40 V load-dump transients and operating up to 125°C ambient. Use Value: AEC-Q100 qualification and 34°C/W thermal resistance ensure reliability in thermally demanding under-hood locations. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM61480QPWPRQ1 | Lower max IOUT (4.0 A vs 3.0 A), no NPOR output, fixed 2.1 MHz fSW, no PFM mode | Lacks Low-IQ PFM and NPOR - unsuitable for stop-start keep-alive or sequenced boot requirements | Select if fixed-frequency PWM-only operation and higher current are prioritized over ultra-low IQ and reset signaling. |
| MPQ4420AGU-AEC1-P | Integrated synchronous rectification, lower quiescent current in sleep (1.5 µA), but no external sync or Idle/Stop-Start Recovery | Missing VIN transient recovery feature and programmable fSW - less suited for aggressive EMI-sensitive infotainment designs | Choose when synchronous efficiency and minimal sleep current outweigh need for external clock sync and transient recovery. |
Compared with LM61480QPWPRQ1 and MPQ4420AGU-AEC1-P, the A8590KLPTR-T uniquely combines Low-IQ PFM, NPOR, external synchronization, and Idle/Stop-Start Recovery - making it optimal for automotive infotainment systems requiring both ultra-low standby power and robust transient behavior.
Availability
A8590KLPTR-T is available at Aetrix Electronics and suitable for automotive instrument clusters, car audio systems, and HVAC control units requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for A8590KLPTR-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 applications.
The A8590 product line delivers wide-input, high-current buck regulators optimized for next-generation automotive infotainment and body electronics - emphasizing AEC-Q100 reliability, ultra-low IQ, and advanced protection features.
FAQ
What is the minimum input voltage required for the A8590KLPTR-T to maintain regulation?
The A8590KLPTR-T maintains regulation down to 3.6 VIN (typical) when VIN is decreasing, with UVLO stop threshold specified at 3.4 V (min). Below this, the device disables switching and pulls COMP and SS low. This enables operation during automotive cold-crank events where battery voltage dips transiently.
Does the A8590KLPTR-T support pre-biased startup?
Yes, the A8590KLPTR-T supports pre-biased startup: it safely starts into an already charged output without forcing reverse current or causing system reset. This is essential for hot-swap applications and redundant power architectures where VOUT may retain residual voltage during reconfiguration.
How does the A8590KLPTR-T handle load-dump transients?
The A8590KLPTR-T withstands surge voltages up to 40 V on VIN, exceeding ISO 7637-2 Pulse 5a requirements. Its absolute maximum rating for VIN is 40 V, and internal protection circuitry - including VIN undervoltage lockout and robust gate drive - ensures reliable operation during automotive load-dump events.
What is the purpose of the NPOR pin on the A8590KLPTR-T?
The NPOR (Not Power-On Reset) pin on the A8590KLPTR-T is an active-low open-drain output that remains low until VOUT has stabilized within regulation for ≥7.5 ms. It provides hardware reset signaling to downstream MCUs or FPGAs, ensuring deterministic boot sequencing in automotive systems.
Can the A8590KLPTR-T be synchronized to an external clock source?
Yes, the A8590KLPTR-T can be synchronized to an external clock applied to the PWM/PFM pin. When the incoming clock frequency exceeds the base fOSC (set by RFSET), the internal PWM frequency locks to the external clock - enabling EMI reduction in multi-converter systems and deterministic timing alignment.
A8590KLPTR-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:
- Not For New Designs
- 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:
- 3A
- Frequency - Switching:
- 2.4MHz
- 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
A8590KLPTR-T FAQ
1.How can I place an order for A8590KLPTR-T through Aetrix?
Please submit a Request for Quotation (RFQ) for A8590KLPTR-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 A8590KLPTR-T reliable?
The price and inventory of A8590KLPTR-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for A8590KLPTR-T is usually 5 days.
3.What payment methods are accepted for A8590KLPTR-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for A8590KLPTR-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for A8590KLPTR-T?
A8590KLPTR-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your A8590KLPTR-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 A8590KLPTR-T?
For technical support, including A8590KLPTR-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your A8590KLPTR-T requirements.
6.How does Aetrix verify that A8590KLPTR-T is sourced from the original manufacturer or authorized distributors?
All A8590KLPTR-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 A8590KLPTR-T meets industry standards.
7.What is the process for return or replacement of A8590KLPTR-T?
All A8590KLPTR-T units undergo pre-shipment inspection (PSI). If there is an issue with A8590KLPTR-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 A8590KLPTR-T part is unused and in its original packaging.
Return procedure for A8590KLPTR-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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