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Allegro MicroSystems A8585KLKTR-T
- Part No.:
- A8585KLKTR-T
- Manufacturer:
- Allegro MicroSystems
- Package:
- 10-LSOP (0.154", 3.90mm Width) Exposed Pad
- Datasheet:
-
A8585KLKTR-T.pdf
- Description:
- IC REG BUCK 5V 2A 10SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,317
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Product details
Overview
A8585KLKTR-T from Allegro MicroSystems is a wide-input, 2 A synchronous buck regulator with selectable PWM/Low-IQ PFM mode, ±1.0% output voltage accuracy at 5.0 V, integrated 110 mΩ high-side MOSFET, and automotive AEC-Q100 qualification - designed for car audio and infotainment power rails.
For engineers reviewing the A8585KLKTR-T datasheet, A8585KLKTR-T pinout, A8585KLKTR-T application, or A8585KLKTR-T equivalent, this page delivers verified functional context, validated pin roles, confirmed thermal and protection behavior, and real-world selection guidance for automotive DC-DC design.
Technical Context
The A8585KLKTR-T implements current-mode control with external compensation (COMP pin), enabling stable operation across ceramic or electrolytic output capacitors and supporting adjustable switching frequency from 300–550 kHz (up to 605 kHz with sync). It features pulse-by-pulse overcurrent protection, hiccup-mode short-circuit recovery, and BOOT open/short fault detection.
Its dual-mode operation is controlled via the PWM/PFM pin: logic high forces continuous PWM; logic low enables Low-IQ PFM after 2048 clock cycles if load is light and no sync signal is present. The device starts in PWM mode during soft start and transitions autonomously based on load and control pin state.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0 V ±1.0% (4.95–5.05 V at 0–85°C), ensuring precise rail regulation for audio DSPs and display controllers. |
| Max Output Current | 2.0 A continuous, sufficient to power multi-channel Class D amplifiers or infotainment SoCs without external boost stages. |
| Input Voltage Range | 4.0 V to 35 V, covering cold-crank (4.0 V) to load-dump (40 V transient tolerance) in automotive environments. |
| Low-IQ Mode Current | 28–33 µA at 12 VIN/5.0 VOUT/40 µA load, enabling always-on subsystems with minimal battery drain. |
| Switching Frequency | Adjustable 300–550 kHz (via RFSET), extendable to 605 kHz with external sync - supports EMI optimization and inductor size reduction. |
| Thermal Resistance | RθJA = 35 °C/W on 4-layer JEDEC PCB, requiring ≥6 vias under exposed pad for reliable 2 A operation at 150°C junction. |
| Protection Features | UVLO (3.6 V start), thermal shutdown (170°C trip), NPOR (7.5 ms delay), hiccup OCP (120 counts), and BOOT fault detection. |
Pinout & Package
Package: 10-pin SOIC with exposed thermal pad (suffix LK), lead-free, matte-tin plating - thermally enhanced for automotive under-hood use.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1,2 VIN | Power input for control circuitry and high-side MOSFET drain | Must connect to 4–35 V supply with high-frequency ceramic capacitor placed close to pins; dual pins reduce IR drop and improve thermal path. |
| 3 PWM/PFM | Mode selection control input | Logic high = forced PWM; logic low = enable Low-IQ PFM after 2048 clocks (if light load and no sync); internal 200 kΩ pull-down. |
| 4 FSET/SYNCPWM | Frequency setting and synchronization input | Resistor-to-GND sets fSW; external clock overrides PWM/PFM pin and locks switching to sync source - critical for EMI reduction. |
| 5 VOUT | Regulated output and feedback node | Kelvin-connected to output capacitor; supplies internal bias when >3.1 V; connects to error amp via internal divider (4× for 5 V version). |
| 6 NPOR | Active-low power-on reset output | Open-drain, 7.5 ms delay after regulation; asserts low if VOUT drops below 4.62 V - used to reset downstream microcontrollers. |
| 7 COMP | Error amplifier output and loop compensation node | External RZ/CZ/CP network sets stability margin and transient response; supports wide range of output caps and inductors. |
| 8 GND | Power and signal ground reference | Must be connected to PCB ground plane; shared with exposed pad for thermal and noise integrity. |
| 9 SW | Switch node (high-side MOSFET source) | Connects to external diode cathode and inductor; requires short, wide trace to minimize ringing and EMI. |
| 10 BOOT | High-side gate drive bootstrap supply | 47 nF ceramic cap between BOOT and SW provides gate charge; fault protection triggers if BOOT voltage exceeds VSW + 7 V. |
| Pad | Exposed thermal pad | Must be soldered to ground plane with ≥6 thermal vias - primary path for heat dissipation at full 2 A load. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 1 qualification | Validated for −40°C to +150°C junction operation - suitable for engine bay and dashboard mounting without derating. |
| Load-dump survival up to 40 V | Withstands ISO 7637-2 Pulse 5a transients without latch-up or damage - eliminates need for upstream TVS in many designs. |
| Pre-biased startup capability | VOUT ramps monotonically from pre-charged state - prevents system reset or brown-out during hot-swap or battery replacement. |
| EMI reduction architecture | Includes frequency dithering (±7.5%) and controlled SW node slew rate (0.72 V/ns) - simplifies compliance with CISPR 25 Class 5. |
| Internal 5 ms soft-start | Fixed ramp time prevents inrush current spikes into bulk capacitance - avoids fuse tripping and input rail collapse during power-up. |
| Pin-fault tolerant design | Detects open/short conditions on BOOT, SW, NPOR, and FSET pins - enhances field reliability in harsh automotive harness environments. |
Applications
| Instrument Clusters | Car Audio Amplifiers |
|---|---|
Use Scenario: Powering digital gauges, TFT displays, and CAN interface ICs in modern digital dashboards. IC Role / Device Role / Timing Role: Primary 5 V buck regulator delivering clean, regulated power with NPOR-driven MCU reset sequencing. Use Value: ±1.0% output accuracy ensures consistent ADC reference and display backlight driver performance across temperature. | Use Scenario: Supplying Class D amplifier ICs and DSPs in OEM head units and aftermarket receivers. IC Role / Device Role / Timing Role: High-current 5 V rail generator with Low-IQ PFM mode enabling "standby listening" functionality. Use Value: 28 µA quiescent current at 40 µA load extends battery life during vehicle sleep without disabling audio wake-on-voice. |
| Infotainment Head Units | HVAC Control Modules |
Use Scenario: Providing stable 5 V power to touch-screen controllers, Wi-Fi/BT modules, and navigation processors. IC Role / Device Role / Timing Role: Main system regulator with external sync capability to align switching frequency with display refresh or audio clock domains. Use Value: Adjustable 300–550 kHz fSW avoids audible noise in speaker systems and reduces EMI coupling into sensitive RF sections. | Use Scenario: Powering microcontrollers, motor drivers, and sensor interfaces in climate control panels. IC Role / Device Role / Timing Role: Robust 5 V supply with UVLO hysteresis (400 mV) and thermal shutdown - handles stop-start battery voltage dips. Use Value: Operates down to 3.6 VIN (falling), sustaining regulation through idle-stop events without system reboot. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MPQ4332GJ-AEC1-P | 4.5–36 V input, 2 A, fixed 5 V, integrated compensation, no Low-IQ PFM mode | Lacks ultra-low-quiescent operation - unsuitable for always-on infotainment standby | Select when simplicity and reduced BOM count outweigh need for <33 µA IQ. |
| TPS54560QDGQRQ1 | 4.5–60 V input, 5 A, adjustable output, external compensation, 145 µA IQ in Eco-mode | Higher IQ, wider VIN, higher current - over-specified for 5 V/2 A audio rails | Select only if future-proofing for 5–60 V transients or >2 A peak loads is required. |
Compared with MPQ4332GJ-AEC1-P and TPS54560QDGQRQ1, the A8585KLKTR-T uniquely balances automotive robustness, 5 V precision, 2 A capability, and sub-33 µA Low-IQ PFM - making it optimal for cost- and efficiency-sensitive car audio power stages where standby current is critical.
Availability
A8585KLKTR-T is available at Aetrix Electronics and suitable for automotive instrument clusters, car audio amplifiers, and infotainment head units requiring stable component supply, AEC-Q100 compliance, and long-term production continuity.
Supply support for A8585KLKTR-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 of high-performance power ICs and magnetic sensors, specializing in automotive-grade analog and mixed-signal solutions.
The A8585 family belongs to Allegro's automotive power management product line, engineered specifically for next-generation car audio and infotainment systems demanding wide-input operation, low quiescent current, and robust fault protection.
FAQ
What is the output voltage tolerance of the A8585KLKTR-T over temperature?
The A8585KLKTR-T delivers 5.0 V output with ±1.0% accuracy - meaning 4.95–5.05 V at 0–85°C, and 4.925–5.075 V across the full −40°C to +150°C junction range. This is ensured by design and characterization, not production-tested per unit, but guaranteed by Allegro's AEC-Q100 qualification process for the A8585KLKTR-T.
Does the A8585KLKTR-T support external frequency synchronization?
Yes, the A8585KLKTR-T supports external synchronization via its FSET/SYNCPWM pin. Applying a clock signal within 375–605 kHz forces PWM mode and locks the internal oscillator to that frequency - overriding the PWM/PFM pin state and enabling EMI reduction through frequency alignment with other system clocks.
How does the A8585KLKTR-T enter Low-IQ PFM mode, and what triggers the transition back to PWM?
The A8585KLKTR-T enters Low-IQ PFM mode when the PWM/PFM pin is held low for 2048 clock cycles *and* the load is light (typically <100 mA). It automatically reverts to PWM mode when output current rises above ~800 mA peak threshold (IPEAK(LO_IQ)), ensuring regulation stability under dynamic load steps - all without external intervention.
What thermal design considerations apply to the A8585KLKTR-T in a 2 A application?
For 2 A continuous operation, the A8585KLKTR-T requires the exposed thermal pad to be soldered to a solid ground plane with ≥6 thermal vias. Its RθJA is 35 °C/W on a 4-layer JEDEC board; at full load and 12 VIN, junction temperature rise is ~35°C above ambient - keeping it well below the 170°C thermal shutdown threshold when properly laid out.
Is the A8585KLKTR-T compatible with pre-biased output capacitors during startup?
Yes, the A8585KLKTR-T supports pre-biased startup: VOUT increases monotonically from any initial voltage without causing reverse current or system reset. This feature is essential for hot-swap scenarios and battery-replacement sequences in automotive modules where downstream capacitance may retain charge.
A8585KLKTR-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Allegro MicroSystems
- Series:
- -
- Package/Case:
- 10-LSOP (0.154", 3.90mm Width) Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4V
- Voltage - Input (Max):
- 35V
- Voltage - Output (Min/Fixed):
- 5V
- Voltage - Output (Max):
- -
- Current - Output:
- 2A
- Frequency - Switching:
- 300kHz ~ 550kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-SOIC
A8585KLKTR-T FAQ
1.How can I place an order for A8585KLKTR-T through Aetrix?
Please submit a Request for Quotation (RFQ) for A8585KLKTR-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 A8585KLKTR-T reliable?
The price and inventory of A8585KLKTR-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for A8585KLKTR-T is usually 5 days.
3.What payment methods are accepted for A8585KLKTR-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for A8585KLKTR-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for A8585KLKTR-T?
A8585KLKTR-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your A8585KLKTR-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 A8585KLKTR-T?
For technical support, including A8585KLKTR-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your A8585KLKTR-T requirements.
6.How does Aetrix verify that A8585KLKTR-T is sourced from the original manufacturer or authorized distributors?
All A8585KLKTR-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 A8585KLKTR-T meets industry standards.
7.What is the process for return or replacement of A8585KLKTR-T?
All A8585KLKTR-T units undergo pre-shipment inspection (PSI). If there is an issue with A8585KLKTR-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 A8585KLKTR-T part is unused and in its original packaging.
Return procedure for A8585KLKTR-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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