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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > LED Drivers

Allegro MicroSystems A8513KLYTR-2-T

Name: A8513KLYTR-2-T
Brand: Allegro MicroSystems
SKU: A8513KLYTR-2-T
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: A8513KLYTR-2-T

Manufacturer:: Allegro MicroSystems

Category:: LED Drivers

Package:: 10-VFSOP, 10-MSOP (0.118", 3.00mm Width) Exposed Pad

Datasheet:: A8513KLYTR-2-T.pdf

Description:: IC LED DRV RGLTR PWM 10MSOP

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Product details

Overview

A8513KLYTR-2-T from Allegro MicroSystems is a single-output white LED driver IC for automotive and industrial LCD backlighting, integrating a current-mode boost converter with internal 60 V DMOS FET and one 150 mA LED current sink. It operates from 4.5–40 V input, supports up to 14-series LEDs, and features 500 kHz switching frequency (confirmed for this variant), AEC-Q100 qualification, and comprehensive fault protection including OVP, UVP, open/short LED detection, and thermal shutdown.

For engineers reviewing the A8513KLYTR-2-T datasheet, A8513KLYTR-2-T pinout, A8513KLYTR-2-T application, or A8513KLYTR-2-T equivalent, key selection considerations include its 0.5 MHz boost frequency (vs. 2 MHz in A8513KLYTR-T), 10-pin MSOP-LY package with exposed thermal pad, 150 mA max LED current capability, and suitability for start-stop/cold-crank automotive power environments requiring robust fault tolerance and PWM dimming down to 200 Hz.

Technical Context

The A8513KLYTR-2-T implements a current-mode boost controller with adaptive output voltage regulation (V_OUT = V_LED + 0.88 V) and dual-level cycle-by-cycle current limiting (2.2 A primary, 3.5 A secondary). Its EN/PWM pin serves as combined enable and dimming interface with 250 ns turn-on/off delay and supports 5000:1 PWM dimming at 200 Hz.

Protection architecture includes latched secondary OVP (55.5 V at SW pin), auto-restart LED short-to-GND detection during startup, ISET short protection, and thermal shutdown at 165 °C with 20 °C hysteresis. The device uses an internal 1.218 V OVP reference with external resistive divider for programmable output overvoltage threshold up to 45 V.

Key Specifications

Parameter	Value and Actual Design Meaning
Boost Switching Frequency	500 kHz - Enables operation above AM band while reducing EMI filter size vs. lower-frequency variants
Input Voltage Range	4.5–40 V - Supports automotive cold-crank (4.5 V) and load-dump (40 V) transients without external protection
Max LED Current	150 mA - Sets upper limit for single-string backlight drive; accuracy ±3% over temperature
LED String Capacity	Up to 14 series WLEDs - Requires minimum V_OUT headroom of 0.88 V for current regulation
OVP Threshold (OVP pin)	1.218 V (typ) - External resistor divider scales protection to user-defined V_OUT limit (e.g., 45 V max)
Thermal Shutdown	165 °C junction - Latched shutdown with 20 °C hysteresis prevents thermal runaway in enclosed displays
PWM Dimming Ratio	5000:1 at 200 Hz - Enables high-contrast grayscale control in infotainment and cluster displays

Pinout & Package

Package: 10-pin MSOP with exposed thermal pad (LY suffix); RoHS-compliant, lead-free, 100% matte tin plating; R_θJA = 48 °C/W on 4-layer JEDEC board.

Pin/Terminal	Circuit Role	Design Meaning
SW	Boost switch drain	Connects to boost inductor and Schottky diode anode; handles peak currents up to 3.5 A
OVP	Output overvoltage sense	High-impedance input for resistive divider; triggers shutdown if voltage exceeds 1.218 V
VIN	Main power input	Accepts 4.5–40 V; includes UVLO with 4.35 V rising threshold and 450 mV hysteresis
FAULT	Fault status output	Open-drain logic-low signal indicating latched faults (OVP, secondary OVP, thermal)
VDD	Internal LDO output	Provides regulated bias for internal circuits; requires 0.01–0.1 µF decoupling to GND
COMP	Error amplifier output	Compensation node for loop stability; sources 80 µA during soft-start
GND	Power and signal ground	Reference for all analog blocks; must connect to PCB ground plane via ≥8 thermal vias under pad
ISET	LED current programming	1.003 V reference input; sets I_LED = R_ISET × 1045 / 1.003 V (40–150 mA range)
EN/PWM	Enable and dimming control	Single-pin interface for logic-enable and PWM duty-cycle control; 250 ns response time
LED	LED string cathode connection	Sinks regulated current; monitored for open/short faults during startup and operation

Key Features

Feature	Design Value
AEC-Q100 qualified	Grade-1 (-40 to +125 °C ambient) qualification enables use in automotive infotainment and instrument clusters without additional qualification effort
Dual-level current limiting	2.2 A cycle-by-cycle limit prevents inductor saturation; 3.5 A secondary limit protects against destructive short-circuit events like inductor shorts
Adaptive output regulation	V_OUT dynamically tracks LED string forward voltage + 0.88 V, minimizing power loss and heat generation in the boost stage
Integrated fault flag signaling	Open-drain FAULT pin asserts low for latched conditions (thermal, secondary OVP, open LED), enabling system-level fault response without external monitoring
Robust startup sequence	Pre-charges LED pin to detect shorts before enabling boost; verifies OVP pin voltage rise to prevent startup into output short

Applications

Automotive Infotainment Display	Automotive Instrument Cluster
Use Scenario: Backlighting for 7–10 inch TFT LCDs in center-stack head units subjected to 40 V load-dump transients and -40 °C cold-crank starts. IC Role / Device Role / Timing Role: Single-chip WLED driver providing regulated 150 mA current to 8–12 series LEDs with 5000:1 PWM dimming for UI brightness control. Use Value: Eliminates need for external boost MOSFET and current-sense resistor; integrated fault protection reduces BOM count and improves field reliability under automotive stress conditions.	Use Scenario: Driving segmented or full-graphic LCD backlight in digital instrument clusters where space is constrained and thermal management is critical. IC Role / Device Role / Timing Role: High-efficiency LED driver with adaptive V_OUT regulation and 500 kHz switching to minimize EMI near sensitive CAN/LIN bus signals. Use Value: Exposed thermal pad and 48 °C/W R_θJA enable stable operation at 125 °C ambient; FAULT pin integration simplifies microcontroller fault-handling firmware.
Industrial LCD Panel	Flatbed Scanner Illumination
Use Scenario: Backlight for 15–24 inch industrial HMI panels operating from wide-input 24 V DC supplies with frequent brownouts. IC Role / Device Role / Timing Role: Fault-tolerant LED driver supporting 14-series LED strings with redundant OVP (primary + secondary) and undervoltage lockout. Use Value: Withstands 4.5 V input dips without dropout; latched fault reporting prevents uncontrolled LED behavior during intermittent supply faults.	Use Scenario: Linear LED array illumination in document scanners requiring precise intensity control and fast PWM response for motion blur reduction. IC Role / Device Role / Timing Role: High-speed dimming driver with 250 ns EN/PWM-to-LED response enabling sub-millisecond exposure timing synchronization. Use Value: Fast turn-on/off minimizes PWM-induced intensity error at low duty cycles; internal current regulation ensures consistent line illumination across scan speed variations.

Automotive Infotainment Display

Automotive Instrument Cluster

Use Scenario: Backlighting for 7–10 inch TFT LCDs in center-stack head units subjected to 40 V load-dump transients and -40 °C cold-crank starts.

IC Role / Device Role / Timing Role: Single-chip WLED driver providing regulated 150 mA current to 8–12 series LEDs with 5000:1 PWM dimming for UI brightness control.

Use Value: Eliminates need for external boost MOSFET and current-sense resistor; integrated fault protection reduces BOM count and improves field reliability under automotive stress conditions.

Use Scenario: Driving segmented or full-graphic LCD backlight in digital instrument clusters where space is constrained and thermal management is critical.

IC Role / Device Role / Timing Role: High-efficiency LED driver with adaptive V_OUT regulation and 500 kHz switching to minimize EMI near sensitive CAN/LIN bus signals.

Use Value: Exposed thermal pad and 48 °C/W R_θJA enable stable operation at 125 °C ambient; FAULT pin integration simplifies microcontroller fault-handling firmware.

Industrial LCD Panel

Flatbed Scanner Illumination

Use Scenario: Backlight for 15–24 inch industrial HMI panels operating from wide-input 24 V DC supplies with frequent brownouts.

IC Role / Device Role / Timing Role: Fault-tolerant LED driver supporting 14-series LED strings with redundant OVP (primary + secondary) and undervoltage lockout.

Use Value: Withstands 4.5 V input dips without dropout; latched fault reporting prevents uncontrolled LED behavior during intermittent supply faults.

Use Scenario: Linear LED array illumination in document scanners requiring precise intensity control and fast PWM response for motion blur reduction.

IC Role / Device Role / Timing Role: High-speed dimming driver with 250 ns EN/PWM-to-LED response enabling sub-millisecond exposure timing synchronization.

Use Value: Fast turn-on/off minimizes PWM-induced intensity error at low duty cycles; internal current regulation ensures consistent line illumination across scan speed variations.

Equivalent & Alternatives

The following parts are listed as comparable options for similar LED driver applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
A80603KESJSR	Successor part with 2 MHz switching, 200 mA LED current, and enhanced thermal performance in 12-pin SOIC package	Designed for next-gen automotive displays requiring higher current and improved efficiency; not pin-compatible with A8513KLYTR-2-T	Select A80603KESJSR for new designs needing higher LED current or better thermal dissipation; requires PCB layout revision
LM3409QMYX/NOPB	Adjustable-frequency (200–2000 kHz) buck-boost LED driver with 1.5 A switch, no integrated current sink, requires external sense resistor	Flexible topology supports buck, boost, or SEPIC; lacks AEC-Q100 rating and integrated fault flag signaling	Choose LM3409QMYX/NOPB when system requires variable topology or >150 mA current; adds design complexity but offers frequency tuning

Compared with A8513KLYTR-2-T, A80603KESJSR delivers higher current and frequency in a larger package with revised pinout, while LM3409QMYX/NOPB provides topology flexibility and higher switch current at the cost of added external components and no automotive qualification.

Availability

A8513KLYTR-2-T is available at Aetrix Electronics and suitable for automotive infotainment, instrument cluster, and industrial LCD display applications requiring stable component supply despite end-of-life status.

Supply support for A8513KLYTR-2-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 driver solutions for automotive and industrial markets.

The A8513 product line is designed specifically for fault-tolerant, wide-input-voltage LED backlighting in demanding automotive environments, emphasizing AEC-Q100 compliance, transient resilience, and integrated protection.

FAQ

What is the confirmed switching frequency of A8513KLYTR-2-T?

The A8513KLYTR-2-T has a fixed oscillator frequency of 500 kHz, as explicitly specified in the Selection Guide table and Electrical Characteristics section of the datasheet. This distinguishes it from other variants: A8513KLYTR-T (2 MHz), A8513KLYTR-1-T (1 MHz), and A8513KLYTR-3-T (250 kHz). The 500 kHz frequency balances EMI suppression and component size for mid-range backlight applications.

Is A8513KLYTR-2-T still recommended for new designs?

No - A8513KLYTR-2-T is explicitly marked as no longer in production per the datasheet's "Selection Guide" footnote: "Part variants A8513KLYTR-2-T, A8513KLYTR-3-T, and A8513KLYTR-1-T are no longer in production. This device should not be purchased for new design applications." A80603KESJSR is the manufacturer-recommended replacement.

How does the FAULT pin behave during different fault conditions in A8513KLYTR-2-T?

The FAULT pin of A8513KLYTR-2-T is an open-drain output that pulls low only for latched faults: secondary OVP (open diode), thermal shutdown, and open LED with concurrent OVP. It remains high during auto-restart faults like cycle-by-cycle current limiting or input UVLO. The pin stays asserted until EN/PWM is held low >16 ms or power is cycled to clear the latch.

What is the maximum number of LEDs the A8513KLYTR-2-T can drive, and what limits it?

The A8513KLYTR-2-T can drive up to 14 series white LEDs, limited by its 55.5 V secondary OVP threshold at the SW pin and the 0.88 V LED current sink regulation voltage. For example, with 3.2 V typical LED forward voltage, 14 LEDs require ~44.8 V plus 0.88 V = 45.68 V V_OUT, staying within the safe 55.5 V switch rating and allowing margin for OVP programming.

Does A8513KLYTR-2-T support analog dimming in addition to PWM?

Yes - A8513KLYTR-2-T supports analog dimming by applying a voltage source (e.g., DAC) to the ISET pin or ground side of the R_ISET resistor. The internal ISET amplifier operates linearly from 40–160 µA, enabling analog control of LED current between ~25% and 100% of full scale, though dimming ratio is inherently more limited than PWM's 5000:1 capability.

A8513KLYTR-2-T Specifications

Product attributes: Attribute value

Manufacturer:: Allegro MicroSystems

Series:: -

Package/Case:: 10-VFSOP, 10-MSOP (0.118", 3.00mm Width) Exposed Pad

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Type:: DC DC Regulator

Topology:: SEPIC, Step-Up (Boost)

Internal Switch(s):: Yes

Number of Outputs:: 1

Voltage - Supply (Min):: 4.5V

Voltage - Supply (Max):: 40V

Voltage - Output:: -

Current - Output / Channel:: 150mA

Frequency:: 500kHz

Dimming:: PWM

Applications:: Backlight

Operating Temperature:: -40°C ~ 125°C (TA)

Grade:: Automotive

Qualification:: AEC-Q100

Mounting Type:: Surface Mount

Supplier Device Package:: 10-MSOP

A8513KLYTR-2-T FAQ

1.How can I place an order for A8513KLYTR-2-T through Aetrix?

Please submit a Request for Quotation (RFQ) for A8513KLYTR-2-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 A8513KLYTR-2-T reliable?

The price and inventory of A8513KLYTR-2-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for A8513KLYTR-2-T is usually 5 days.

3.What payment methods are accepted for A8513KLYTR-2-T?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for A8513KLYTR-2-T transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for A8513KLYTR-2-T?

A8513KLYTR-2-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your A8513KLYTR-2-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 A8513KLYTR-2-T?

For technical support, including A8513KLYTR-2-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your A8513KLYTR-2-T requirements.

6.How does Aetrix verify that A8513KLYTR-2-T is sourced from the original manufacturer or authorized distributors?

All A8513KLYTR-2-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 A8513KLYTR-2-T meets industry standards.

7.What is the process for return or replacement of A8513KLYTR-2-T?

All A8513KLYTR-2-T units undergo pre-shipment inspection (PSI). If there is an issue with A8513KLYTR-2-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 A8513KLYTR-2-T part is unused and in its original packaging.

Return procedure for A8513KLYTR-2-T:

1.Submit a request within 90 days.

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

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