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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Voltage Regulators - DC DC Switching Regulators

Allegro MicroSystems A8585KLKTR-T-2

Name: A8585KLKTR-T-2
Brand: Allegro MicroSystems
SKU: A8585KLKTR-T-2
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: A8585KLKTR-T-2

Manufacturer:: Allegro MicroSystems

Category:: Voltage Regulators - DC DC Switching Regulators

Package:: 10-LSOP (0.154", 3.90mm Width) Exposed Pad

Datasheet:: A8585KLKTR-T-2.pdf

Description:: IC REG BUCK 5V 2A 10SOIC

Quantity:: RFQ Add To RFQ list

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Product details

Overview

A8585KLKTR-T-2 from Allegro MicroSystems is a wide-input, 2 A automotive buck regulator with selectable 10 µA sleep mode, ±1% output voltage accuracy at 5 V, integrated 110 mΩ high-side MOSFET, and operation down to 3.6 V_IN (falling). It serves as the primary DC-DC power supply for infotainment head units requiring low-quiescent-current standby capability.

For engineers reviewing the A8585KLKTR-T-2 datasheet, A8585KLKTR-T-2 pinout, A8585KLKTR-T-2 application, or A8585KLKTR-T-2 equivalent, key selection criteria include EN/SLEEP-controlled ultra-low-I_Q shutdown (≤10 µA), AEC-Q100 qualification, load-dump survivability to 40 V, and compatibility with ceramic output capacitors in thermally constrained automotive PCB layouts.

Technical Context

The A8585KLKTR-T-2 implements current-mode PWM control with external compensation for stability across variable output capacitance and load conditions. Its EN/SLEEP pin enables automatic transition into 10 µA sleep mode when driven low, disabling switching and forcing V_OUT = 0 V.

It features programmable switching frequency (300–550 kHz), frequency dithering for EMI reduction, and robust protection including pulse-by-pulse overcurrent, hiccup-mode short-circuit response, BOOT fault detection, and thermal shutdown at 170 °C with 20 °C hysteresis.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	Fixed 5.0 V ±1.0% (ensured over –40°C to 150°C junction)
Max Output Current	2.0 A continuous; limited by thermal design and PCB copper area
Input Voltage Range	4.0 V to 35 V operating; withstands 40 V surge (load dump)
Sleep Mode Current	≤10 µA typical at 16 V_IN, ≤25 µA max at 35 V_IN (T_J ≤ 85°C)
Switching Frequency	Adjustable 300–550 kHz via RFSET; sync-capable up to 605 kHz
UVLO Threshold	3.6 V (start), 3.4 V (stop) - supports idle-stop vehicle operation
Thermal Resistance	R_θJA = 35 °C/W on JEDEC 4-layer board - requires exposed pad soldering

Pinout & Package

Package: 10-pin SOIC with exposed thermal pad (suffix LK); RoHS-compliant, matte-tin leadframe.

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 rail with local high-frequency ceramic capacitor; dual pins reduce IR drop
3 EN/SLEEP	Enable/sleep control input	Logic-high enables regulation; logic-low forces ultra-low-I_Q shutdown (V_OUT = 0 V)
4 FSET/SYNCPWM	Frequency setting and synchronization input	Resistor-to-GND sets f_SW; external clock overrides mode selection and forces PWM
5 VOUT	Regulated output and feedback node	Kelvin-connected to output capacitor; supplies internal bias when ≥3.1 V
6 NPOR	Active-low power-on reset output	Open-drain, 7.5 ms delay after V_OUT regulation; asserts low if V_OUT drops below 4.62 V
7 COMP	Error amplifier output and loop compensation node	Connect R_Z/C_Z/C_P network here for current-mode loop stability
8 GND	Analog and power ground reference	Must tie to PCB ground plane; connects to exposed thermal pad
9 SW	High-side MOSFET source and power switch node	Connects to inductor and freewheeling diode; high dv/dt node requiring tight layout
10 BOOT	High-side gate driver bootstrap supply	47 nF ceramic cap required between BOOT and SW; fault protection triggers if <1.8 V
Pad	Exposed thermal pad	Must be soldered to internal/external ground planes using ≥6 vias for thermal dissipation

Key Features

Feature	Design Value
AEC-Q100 Grade 1 qualification	Validated for –40°C to +125°C ambient (150°C junction) in automotive environments
Select 10 µA sleep mode	EN/SLEEP pin assertion disables all switching and reduces I_IN to ≤10 µA - critical for always-on infotainment modules
Pre-biased startup capability	V_OUT ramps monotonically even when pre-charged - avoids reverse current or latch-up during hot-swap
External compensation	COMP pin allows full loop tuning for diverse output caps (ceramic/electrolytic) and load transients
Load-dump survival	Withstands 40 V transient on VIN per ISO 7637-2 Pulse 5a - eliminates need for upstream TVS in many designs

Applications

Infotainment Head Unit Power	Instrument Cluster Core Supply
Use Scenario: Primary 5 V rail for DSP, display controller, and audio codec in automotive head units with always-on CAN wake capability. IC Role / Device Role / Timing Role: Main buck regulator delivering 2 A at ±1% accuracy; manages sleep/wake transitions via EN/SLEEP pin synchronized to vehicle ignition state. Use Value: 10 µA sleep current extends battery life during extended parking; 3.6 V UVLO supports engine stop-start without brownout.	Use Scenario: Central 5 V supply for microcontroller, graphics processor, and sensor interface in digital instrument clusters. IC Role / Device Role / Timing Role: High-reliability DC-DC converter with NPOR output used for system-level reset coordination and fault reporting. Use Value: AEC-Q100 qualification and 170 °C thermal shutdown ensure functional safety compliance; 40 V surge rating eliminates external clamping components.
Navigation System Core Rail	HVAC Control Module Supply
Use Scenario: Stable 5 V source for GPS receiver, cellular modem, and touch controller in embedded navigation systems. IC Role / Device Role / Timing Role: Regulator with programmable f_SW and EMI dithering to minimize interference with RF front-ends. Use Value: Adjustable switching frequency avoids sensitive bands (e.g., FM radio, GNSS); soft-start prevents inrush-induced bus droop.	Use Scenario: Power management for HVAC MCU, motor drivers, and cabin sensors in climate control modules. IC Role / Device Role / Timing Role: Input-supply supervisor with UVLO hysteresis and NPOR delay ensuring deterministic boot sequencing. Use Value: 3.4 V UVLO stop threshold prevents erratic operation during battery recovery; hiccup-mode OCP protects against fan stall faults.

Infotainment Head Unit Power

Instrument Cluster Core Supply

Use Scenario: Primary 5 V rail for DSP, display controller, and audio codec in automotive head units with always-on CAN wake capability.

IC Role / Device Role / Timing Role: Main buck regulator delivering 2 A at ±1% accuracy; manages sleep/wake transitions via EN/SLEEP pin synchronized to vehicle ignition state.

Use Value: 10 µA sleep current extends battery life during extended parking; 3.6 V UVLO supports engine stop-start without brownout.

Use Scenario: Central 5 V supply for microcontroller, graphics processor, and sensor interface in digital instrument clusters.

IC Role / Device Role / Timing Role: High-reliability DC-DC converter with NPOR output used for system-level reset coordination and fault reporting.

Use Value: AEC-Q100 qualification and 170 °C thermal shutdown ensure functional safety compliance; 40 V surge rating eliminates external clamping components.

Navigation System Core Rail

HVAC Control Module Supply

Use Scenario: Stable 5 V source for GPS receiver, cellular modem, and touch controller in embedded navigation systems.

IC Role / Device Role / Timing Role: Regulator with programmable f_SW and EMI dithering to minimize interference with RF front-ends.

Use Value: Adjustable switching frequency avoids sensitive bands (e.g., FM radio, GNSS); soft-start prevents inrush-induced bus droop.

Use Scenario: Power management for HVAC MCU, motor drivers, and cabin sensors in climate control modules.

IC Role / Device Role / Timing Role: Input-supply supervisor with UVLO hysteresis and NPOR delay ensuring deterministic boot sequencing.

Use Value: 3.4 V UVLO stop threshold prevents erratic operation during battery recovery; hiccup-mode OCP protects against fan stall faults.

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 device; same pinout, improved efficiency, lower I_Q in PFM mode (7 µA), enhanced thermal performance (R_θJA = 28 °C/W)	Direct replacement for new designs; supports identical 5 V/2 A use cases with tighter thermal margin	Select for production designs requiring lifecycle support and improved light-load efficiency
LM61480QRNXTQ1	TI automotive buck; 5 V fixed, 3.5 A, 15 µA I_Q, no dedicated sleep pin - uses enable pin only	Lacks hardware-enforced 10 µA shutdown; requires external logic for ultra-low-power states	Choose when higher current headroom is needed and sleep-mode current is less critical than peak output capability

Compared with A8585KLKTR-T-2, A8586KEJTR-T offers lower thermal resistance and reduced PFM quiescent current while maintaining pin compatibility, whereas LM61480QRNXTQ1 provides greater output current but lacks hardware sleep mode - making A8585KLKTR-T-2 uniquely suited for strict 10 µA standby requirements in legacy infotainment platforms.

Availability

A8585KLKTR-T-2 is available at Aetrix Electronics and suitable for automotive infotainment, instrument cluster, and navigation systems requiring stable component supply despite end-of-life status.

Supply support for A8585KLKTR-T-2 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 for automotive and industrial applications.

The A8585 family was developed specifically for next-generation car audio and infotainment systems, emphasizing ultra-low standby current, load-dump resilience, and seamless integration into space-constrained, thermally demanding automotive PCBs.

FAQ

What is the function of the EN/SLEEP pin on the A8585KLKTR-T-2?

The EN/SLEEP pin on the A8585KLKTR-T-2 controls device enablement and ultra-low-power sleep mode. When pulled high, the regulator operates normally; when pulled low, it enters a shutdown state drawing ≤10 µA from VIN and forcing V_OUT = 0 V. This behavior is exclusive to A8585KLKTR-T-2 and A8585KLKTR-T-3 variants - not present on A8585 or A8585-1.

Is the A8585KLKTR-T-2 still recommended for new designs?

No - Allegro MicroSystems has discontinued A8585KLKTR-T-2 for new designs as of September 30, 2024. The datasheet explicitly states it should not be purchased for new applications. A8586KEJTR-T is the designated replacement, offering improved thermal performance and lower quiescent current while maintaining pin compatibility with A8585KLKTR-T-2.

What output voltage does the A8585KLKTR-T-2 deliver, and how accurate is it?

The A8585KLKTR-T-2 delivers a fixed 5.0 V output with ±1.0% accuracy over –40°C to +150°C junction temperature. This specification is ensured by design and characterization (not 100% production tested), and applies across the full input range (4.0–35 V) and load conditions (0–2 A).

Does the A8585KLKTR-T-2 support external frequency synchronization?

Yes - the A8585KLKTR-T-2 supports external synchronization via its FSET/SYNCPWM pin. Applying a clock signal within 375–605 kHz forces PWM mode and aligns internal switching to the external source, reducing EMI coupling in multi-rail systems. This feature works independently of EN/SLEEP or PWM/PFM pin states.

What protection features are integrated into the A8585KLKTR-T-2?

The A8585KLKTR-T-2 integrates pulse-by-pulse overcurrent protection, hiccup-mode short-circuit response, BOOT open/short detection, VIN undervoltage lockout (3.6 V start), thermal shutdown (170 °C), and NPOR-based output voltage monitoring. All protections are hardware-based and require no external components to activate.

A8585KLKTR-T-2 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:: Obsolete

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-2 FAQ

1.How can I place an order for A8585KLKTR-T-2 through Aetrix?

Please submit a Request for Quotation (RFQ) for A8585KLKTR-T-2 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-2 reliable?

The price and inventory of A8585KLKTR-T-2 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-2 is usually 5 days.

3.What payment methods are accepted for A8585KLKTR-T-2?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for A8585KLKTR-T-2 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for A8585KLKTR-T-2?

A8585KLKTR-T-2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your A8585KLKTR-T-2 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-2?

For technical support, including A8585KLKTR-T-2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your A8585KLKTR-T-2 requirements.

6.How does Aetrix verify that A8585KLKTR-T-2 is sourced from the original manufacturer or authorized distributors?

All A8585KLKTR-T-2 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-2 meets industry standards.

7.What is the process for return or replacement of A8585KLKTR-T-2?

All A8585KLKTR-T-2 units undergo pre-shipment inspection (PSI). If there is an issue with A8585KLKTR-T-2, 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-2 part is unused and in its original packaging.

Return procedure for A8585KLKTR-T-2:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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