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Allegro MicroSystems A8513KLYTR-1-T
- Part No.:
- A8513KLYTR-1-T
- Manufacturer:
- Allegro MicroSystems
- Category:
- LED Drivers
- Package:
- 10-VFSOP, 10-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
A8513KLYTR-1-T.pdf
- Description:
- IC LED DRV RGLTR PWM 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,362
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Product details
Overview
A8513KLYTR-1-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 V to 40 V input, supports up to 14-series LEDs, and features 1 MHz switching frequency, AEC-Q100 qualification, and comprehensive fault protection including OVP, UVP, open/short LED detection, and thermal shutdown.
For engineers reviewing the A8513KLYTR-1-T datasheet, A8513KLYTR-1-T pinout, A8513KLYTR-1-T application, or A8513KLYTR-1-T equivalent, this page delivers verified technical context, exact package mapping (10-pin MSOP-LY), validated pin functions, real-world dimming performance (5000:1 PWM at 200 Hz), and confirmed alternative options aligned with Allegro's official replacement guidance.
Technical Context
The A8513KLYTR-1-T implements a fixed-frequency current-mode boost controller with adaptive output voltage regulation-VOUT = VLED + 0.88 V-to minimize power loss across varying LED string voltages. Its dual-level cycle-by-cycle current limit (2.2 A primary, 3.5 A secondary) enables soft-start and robust inductor short protection.
It uses a single EN/PWM pin for combined enable and dimming control, with 250 ns turn-on/turn-off delay, and integrates fault monitoring via an open-drain FAULT pin that signals overvoltage, undervoltage, open LED, shorted ISET, thermal shutdown, and boost switch faults-some latched, others auto-restarting.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5 V to 40 V - supports automotive start-stop, cold crank, and load dump without external pre-regulation |
| Boost Switching Frequency | 1 MHz ±10% - avoids AM radio band interference while enabling compact magnetics |
| Max LED Current | 150 mA - drives up to 14-series white LEDs with ±3% accuracy over temperature |
| LED Dimming Ratio | 5000:1 at 200 Hz - enables high-contrast display brightness control without visible flicker |
| OVP Threshold Accuracy | ±4% (1.218 V nominal at OVP pin) - allows precise external resistor-divider programming of output overvoltage limit |
| Thermal Shutdown | 165°C with 20°C hysteresis - prevents permanent damage during sustained overload or poor PCB thermal design |
| Package Thermal Resistance | RθJA = 48°C/W on 4-layer JEDEC board - requires exposed pad soldered to ground plane with ≥8 thermal vias |
Pinout & Package
The A8513KLYTR-1-T is housed in a 10-pin MSOP package with exposed thermal pad (LY suffix), Pb-free with 100% matte tin leadframe plating. The exposed pad must be connected to PCB ground plane using ≥8 thermal vias for reliable thermal dissipation under full-load operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW | Boost switch drain node | Connects to inductor and Schottky diode anode; handles peak currents up to 3.5 A during fault events |
| OVP | Output overvoltage sense input | Accepts resistive divider from VOUT; triggers shutdown if voltage exceeds 1.218 V (±4%) |
| VIN | Main power input | Supplies entire IC; UVLO thresholds at 4.35 V (rise) and 3.90 V (fall) with 450 mV hysteresis |
| FAULT | Open-drain fault indicator | Pulled low during latched faults (e.g., open LED + OVP); used to drive external P-FET for input disconnect |
| VDD | Internal LDO output | Provides regulated bias for internal circuits; requires 0.01–0.1 µF decoupling capacitor to GND |
| COMP | Error amplifier output & compensation node | Connects external RC network for loop stability; sources 80 µA during soft start |
| GND | Power and signal reference | Common return for all currents; must be tied to exposed thermal pad |
| ISET | LED current programming input | Current-sense reference pin; sets 100% LED current via RISET resistor (ILED = RISET × 1045 / 1.003 V) |
| EN/PWM | Enable and PWM dimming control | Logic-high enables IC and sets full LED current; PWM duty cycle directly controls average LED current |
| LED | LED string cathode connection | Sinks regulated current up to 150 mA; includes short-to-GND detection during startup |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 qualified | Grade 1 (–40°C to +125°C ambient) - certified for automotive infotainment and cluster applications |
| Dual-level current limiting | 2.2 A cycle-by-cycle + 3.5 A secondary limit - enables controlled soft-start and catastrophic short protection |
| Adaptive output regulation | VOUT = VLED + 0.88 V - minimizes power loss by dynamically adjusting boost output to minimum required voltage |
| Integrated secondary OVP | 55.5 V threshold at SW pin - protects boost switch during open-diode failure without external components |
| Fast PWM response | 250 ns EN/PWM-to-LED turn-on/off delay - preserves dimming fidelity at low duty cycles and high frequencies |
| Fault-tolerant startup | LED pin pre-charge and OVP pin validation before soft start - prevents erroneous enable under shorted or open LED conditions |
Applications
| Automotive Infotainment Display | Automotive Instrument Cluster |
|---|---|
Use Scenario: Backlighting for TFT-LCD modules in center-stack head units operating across –40°C to +85°C ambient with 12 V battery supply subject to load dump transients. IC Role / Device Role / Timing Role: WLED driver providing constant-current source and adaptive boost regulation for 8–12 series LEDs. Use Value: 40 V absolute max input withstands 35 V load dump pulses; AEC-Q100 qualification ensures reliability in safety-critical cockpit systems. |
Use Scenario: Driving segmented or full-graphic LCD backlight in digital instrument clusters where EMI must stay below AM band limits. IC Role / Device Role / Timing Role: High-efficiency boost LED driver with 1 MHz switching to avoid 0.53–1.71 MHz AM radio interference. Use Value: 1 MHz fixed frequency eliminates audible noise and simplifies EMI filter design versus variable-frequency alternatives. |
| Industrial LCD Panel | Flatbed Scanner Illumination |
Use Scenario: Backlight for ruggedized 10.1"–15.6" industrial displays powered from 24 V DC rails with wide temperature cycling. IC Role / Device Role / Timing Role: Fault-protected LED driver supporting up to 14-series strings and delivering stable 150 mA current over –40°C to +125°C junction. Use Value: Comprehensive protection (open LED, shorted ISET, thermal, OVP/UVP) reduces field failure risk in unattended equipment. |
Use Scenario: Uniform linear LED array illumination in office/document scanners requiring precise brightness control and fast on/off response. IC Role / Device Role / Timing Role: PWM-dimmable LED driver with 5000:1 dimming ratio and sub-microsecond enable timing. Use Value: 250 ns EN/PWM-to-LED delay enables accurate strobe synchronization with CCD line capture timing. |
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 device with 2 MHz switching, improved efficiency, and updated protection logic; same LY package footprint but different pinout (no COMP pin, integrated compensation) | Designed for new designs requiring higher efficiency and smaller solution size; not pin-compatible with A8513KLYTR-1-T | Select A80603KESJSR for new designs-Allegro explicitly recommends it as the replacement for discontinued A8513 variants. |
| LM3409QMY/NOPB | Adjustable-frequency (200 kHz–2 MHz) buck-boost LED controller with external MOSFET; no integrated current sink or OVP sense pin | Requires external high-side current sense and discrete protection circuitry; suited for flexible multi-string or high-power configurations | Choose LM3409QMY/NOPB only when system-level flexibility outweighs BOM count and layout complexity penalties. |
Compared with A8513KLYTR-1-T, A80603KESJSR offers higher integration and efficiency but requires PCB redesign due to pinout changes, while LM3409QMY/NOPB provides frequency tuning and external FET control at the cost of added components and reduced fault coverage.
Availability
A8513KLYTR-1-T is available at Aetrix Electronics and suitable for automotive infotainment, instrument cluster, and industrial LCD backlighting applications requiring stable component supply despite end-of-life status.
Supply support for A8513KLYTR-1-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, headquartered in Manchester, NH.
The A8513 product line was developed specifically for fault-tolerant, wide-input-voltage LED backlighting in automotive and harsh-environment displays, emphasizing AEC-Q100 compliance, transient resilience, and integrated protection.
FAQ
What is the switching frequency of the A8513KLYTR-1-T?
The A8513KLYTR-1-T has a factory-trimmed oscillator frequency of 1 MHz ±10%, as specified in the Electrical Characteristics table. This fixed frequency avoids the AM radio band and enables predictable EMI filtering. Unlike the A8513KLYTR-T variant (2 MHz), the -1-T version is optimized for lower switching losses in medium-power backlight applications.
Is the A8513KLYTR-1-T still recommended for new designs?
No-the A8513KLYTR-1-T is officially discontinued per Allegro's documentation dated September 30, 2024. New designs should use the recommended replacement A80603KESJSR. However, A8513KLYTR-1-T remains available for legacy production and repair through Aetrix Electronics with full traceability and lifecycle support.
How does the A8513KLYTR-1-T protect against open LED faults?
The A8513KLYTR-1-T detects open LED strings by monitoring for absence of current at the LED pin during OVP threshold crossing. When both OVP and zero LED current occur simultaneously, it triggers a latched shutdown and asserts the FAULT pin low. Recovery requires holding EN/PWM low for >16 ms or cycling VIN through UVLO.
What is the maximum number of LEDs the A8513KLYTR-1-T can drive?
The A8513KLYTR-1-T supports up to 14-series white LEDs, assuming typical forward voltage of ~3.2 V per LED at 150 mA, resulting in ~45 V total string voltage. The boost stage adapts VOUT to VLED + 0.88 V, and the internal 60 V DMOS switch and secondary OVP (55.5 V) ensure safe operation within this range.
Does the A8513KLYTR-1-T require external compensation components?
Yes-the A8513KLYTR-1-T requires an external RC network connected between the COMP pin and GND to stabilize the current-mode boost control loop. The COMP pin sources 80 µA during soft start and functions as the error amplifier output; Allegro provides design guidelines and example values in the datasheet's Application Information section.
A8513KLYTR-1-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:
- 1MHz
- 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-EP
A8513KLYTR-1-T FAQ
1.How can I place an order for A8513KLYTR-1-T through Aetrix?
Please submit a Request for Quotation (RFQ) for A8513KLYTR-1-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-1-T reliable?
The price and inventory of A8513KLYTR-1-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-1-T is usually 5 days.
3.What payment methods are accepted for A8513KLYTR-1-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for A8513KLYTR-1-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for A8513KLYTR-1-T?
A8513KLYTR-1-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your A8513KLYTR-1-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-1-T?
For technical support, including A8513KLYTR-1-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your A8513KLYTR-1-T requirements.
6.How does Aetrix verify that A8513KLYTR-1-T is sourced from the original manufacturer or authorized distributors?
All A8513KLYTR-1-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-1-T meets industry standards.
7.What is the process for return or replacement of A8513KLYTR-1-T?
All A8513KLYTR-1-T units undergo pre-shipment inspection (PSI). If there is an issue with A8513KLYTR-1-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-1-T part is unused and in its original packaging.
Return procedure for A8513KLYTR-1-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
A8513KLYTR-1-T Tags
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BCR402RE6327HTSA1
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BCR430UXTSA2
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BCR420UE6433HTMA1
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BCR421UE6327HTSA1
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LYT1604D-TL
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HV9910CLG-G
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CL2N8-G
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