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Allegro MicroSystems A8513KLYTR-3-T
- Part No.:
- A8513KLYTR-3-T
- Manufacturer:
- Allegro MicroSystems
- Category:
- LED Drivers
- Package:
- 10-VFSOP, 10-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
A8513KLYTR-3-T.pdf
- Description:
- IC LED DRV RGLTR PWM 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,414
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Product details
Overview
A8513KLYTR-3-T from Allegro MicroSystems is a single-output white LED driver IC for automotive and industrial LCD backlighting, integrating a 250 kHz current-mode boost converter with internal 60 V DMOS FET and a 150 mA LED current sink. It operates from 4.5 V to 40 V input, supports up to 14-series LEDs, and delivers 5000:1 PWM dimming at 200 Hz. Designed for cold-crank and load-dump resilience, it is used in automotive cluster and infotainment displays.
For engineers reviewing the A8513KLYTR-3-T datasheet, A8513KLYTR-3-T pinout, A8513KLYTR-3-T application, or A8513KLYTR-3-T equivalent, this page provides verified technical context, exact pin functions, thermal pad layout guidance, fault protection behavior, and validated alternative options for legacy design continuity.
Technical Context
The A8513KLYTR-3-T implements a fixed-frequency (225–275 kHz), current-mode boost controller with adaptive output voltage regulation-VOUT = VLED + 0.88 V-to minimize power loss across the LED string. Its dual-level cycle-by-cycle current limit (2.2 A primary, 3.5 A secondary) enables soft-start and robust short-circuit protection on the boost switch.
It features integrated diagnostics including open/short LED detection, OVP via resistive divider on OVP pin (1.218 V threshold), secondary SW-pin OVP (55.5 V), ISET resistor short detection, and thermal shutdown at 165 °C with 20 °C hysteresis. The EN/PWM pin serves as combined enable and dimming interface with 250 ns turn-on/off delay.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5 V to 40 V - supports automotive start-stop, cold crank (4.5 V min), and load dump (40 V max) without external protection. |
| Boost Switching Frequency | 225–275 kHz - variant-specific fixed frequency; avoids AM band interference while enabling larger, lower-cost magnetics than 2 MHz versions. |
| Max LED Current | 150 mA - precisely regulated via ISET pin; ±3% accuracy over temperature ensures consistent backlight brightness. |
| LED String Capacity | Up to 14 series white LEDs - enables high-brightness displays with single-driver simplicity and minimal BOM count. |
| PWM Dimming Ratio | 5000:1 at 200 Hz - enables fine-grained brightness control in automotive HMI without visible flicker or color shift. |
| Fault Protection Coverage | Detects open/short LED, shorted boost switch/inductor, shorted ISET, OVP/UVP, overtemperature, and input UVLO - reduces need for external monitoring circuitry. |
| Thermal Resistance | RθJA = 48 °C/W (4-layer PCB) - requires exposed thermal pad soldered to ≥8 vias to GND for reliable 125 °C ambient operation. |
Pinout & Package
Package: 10-pin MSOP with exposed thermal pad (LY package); Pb-free, 100% matte tin leadframe; thermal pad must be connected to PCB ground plane via ≥8 thermal vias.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW | Boost switch drain node | Connects to boost 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; 1.218 V threshold sets OVP trip point; also detects UVP when <110 mV. |
| VIN | Main power input | Supplies entire IC; UVLO active at 4.35 V rise / 3.90 V fall; tolerates 40 V transients per AEC-Q100. |
| FAULT | Open-drain fault flag output | Logic-low indicates latched fault (e.g., open LED + OVP); drives external P-FET for input disconnect per Figure 14. |
| 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 | Connect Type II/III network to GND; sources 80 µA during soft start; critical for loop stability. |
| GND | Power and signal reference | Primary return path; must be tied to thermal pad via vias; separate analog/digital grounding not required. |
| ISET | LED current programming input | RISET resistor to GND sets ILED = (RISET × 1045)/1.003 V; 40–160 µA range enables 40–150 mA LED current. |
| EN/PWM | Enable and PWM dimming input | Active-high enable; 200 Hz PWM at 0.02 duty cycle yields ~94 ms soft start; 250 ns response enables high-fidelity dimming. |
| LED | LED string cathode connection | Sinks regulated current; pre-charged during startup to detect short-to-GND before enabling boost stage. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 qualified (Grade 1) | Validated for –40 °C to +125 °C ambient operation - meets automotive reliability requirements without derating. |
| Integrated 60 V DMOS boost switch | Eliminates external MOSFET and gate driver - reduces solution size and improves efficiency in 12/24 V systems. |
| Dual-level current limiting | 2.2 A cycle-by-cycle limit prevents inductor saturation; 3.5 A secondary limit shuts down IC during catastrophic shorts. |
| Single EN/PWM pin interface | Reduces MCU GPIO count; supports both hard enable and high-fidelity PWM dimming without additional logic. |
| Internal secondary OVP (55.5 V) | Protects boost switch during open-diode faults - eliminates need for external clamp or crowbar circuitry. |
| Exposed thermal pad (LY package) | Enables 48 °C/W junction-to-ambient dissipation - allows full 150 mA LED current at 125 °C ambient with proper PCB layout. |
Applications
| Automotive Cluster Display | Automotive Infotainment System |
|---|---|
Use Scenario: Backlighting for TFT-LCD instrument clusters requiring wide dimming range and EMI compliance. IC Role / Device Role / Timing Role: WLED driver providing constant-current source and adaptive boost voltage regulation. Use Value: 5000:1 PWM dimming at 200 Hz ensures flicker-free visibility across daylight-to-night conditions; 40 V tolerance survives load dump. |
Use Scenario: High-brightness center-stack display in vehicles with stop-start engines and battery voltage fluctuations. IC Role / Device Role / Timing Role: Single-chip LED driver managing up to 14-series WLEDs with integrated fault reporting. Use Value: 4.5–40 V input range accommodates cold-crank (4.5 V) and load-dump (40 V); FAULT pin triggers system-level safety response. |
| Industrial LCD Panel | Flatbed Scanner Illumination |
Use Scenario: Ruggedized HMI displays in factory automation equipment operating in extended temperature environments. IC Role / Device Role / Timing Role: Fault-tolerant LED driver with thermal shutdown and OVP/UVP protection. Use Value: 165 °C thermal shutdown with 20 °C hysteresis prevents latch-up; AEC-Q100 qualification ensures long-term reliability. |
Use Scenario: Uniform linear illumination for document scanning under variable ambient light conditions. IC Role / Device Role / Timing Role: Precision current sink driving multiple parallel LED strings via external current mirrors. Use Value: ±3% LED current accuracy maintains consistent scan-line brightness; 250 ns EN/PWM response enables synchronized strobing. |
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; 2.2 MHz switching, 200 mA max LED current, QFN-20 package with enhanced thermal performance. | Supports higher LED counts and faster transient response; requires PCB redesign due to different pinout and package. | Recommended for new designs requiring higher current or improved efficiency; not pin-compatible with A8513KLYTR-3-T. |
| LM3409QMY/NOPB | Adjustable-frequency boost LED driver (200 kHz–2 MHz); external MOSFET; no integrated current sink; 1.25 V current-sense threshold. | Lacks integrated LED sink and fault flag; requires external current sense and protection logic. | Used where flexibility in topology or higher power is needed; adds BOM cost and design complexity versus A8513KLYTR-3-T's single-chip solution. |
Compared with A8513KLYTR-3-T, A80603KESJSR offers higher frequency and current but demands layout changes, while LM3409QMY/NOPB trades integration for configurability-neither is drop-in, but both address overlapping backlighting use cases with distinct trade-offs in size, protection, and design effort.
Availability
A85513KLYTR-3-T is available at Aetrix Electronics and suitable for automotive cluster displays, industrial HMI panels, and flatbed scanner illumination requiring stable component supply despite end-of-life status.
Supply support for A8513KLYTR-3-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 motion control and energy-efficient power conversion solutions.
The A8513 product line delivers fault-tolerant, wide-input LED drivers for automotive LCD backlighting, engineered to meet AEC-Q100 Grade 1 requirements and simplify system-level safety compliance.
FAQ
What is the switching frequency of the A8513KLYTR-3-T?
The A8513KLYTR-3-T has a fixed boost switching frequency of 225–275 kHz, as specified in the Electrical Characteristics table. This variant is optimized for lower EMI and larger, cost-effective magnetics compared to the 2 MHz A8513KLYTR-T version. The frequency is factory-trimmed and not adjustable.
Is the A8513KLYTR-3-T still recommended for new designs?
No-the A8513KLYTR-3-T is explicitly marked as no longer in production per Allegro documentation dated September 30, 2024. New designs should use the suggested replacement A80603KESJSR. However, A8513KLYTR-3-T remains supported for legacy production continuity and repair programs through Aetrix Electronics.
How does the FAULT pin behave during an open LED condition?
During an open LED fault, the A8513KLYTR-3-T detects missing LED current while boosting VOUT toward the OVP threshold. When both OVP and open-LED conditions occur simultaneously, the IC latches off and pulls the FAULT pin low. Recovery requires holding EN/PWM low >16 ms or cycling VIN through UVLO.
What is the maximum number of LEDs the A8513KLYTR-3-T can drive?
The A8513KLYTR-3-T can drive up to 14 series-connected white LEDs, assuming typical forward voltage of ~3.2 V per LED (total ~45 V), within its 55.5 V secondary OVP limit and 40 V VIN capability. Output voltage is adaptively regulated to VLED + 0.88 V to maximize efficiency.
Does the A8513KLYTR-3-T support analog dimming in addition to PWM?
Yes-the A8513KLYTR-3-T supports analog dimming by applying a variable voltage to the ISET pin via DAC or resistive divider, adjusting ISET current between 40 µA and 160 µA. This changes LED current proportionally but is limited to ~4:1 dimming ratio versus 5000:1 achievable with PWM dimming.
A8513KLYTR-3-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:
- 250kHz
- 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-3-T FAQ
1.How can I place an order for A8513KLYTR-3-T through Aetrix?
Please submit a Request for Quotation (RFQ) for A8513KLYTR-3-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-3-T reliable?
The price and inventory of A8513KLYTR-3-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-3-T is usually 5 days.
3.What payment methods are accepted for A8513KLYTR-3-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for A8513KLYTR-3-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for A8513KLYTR-3-T?
A8513KLYTR-3-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your A8513KLYTR-3-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-3-T?
For technical support, including A8513KLYTR-3-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your A8513KLYTR-3-T requirements.
6.How does Aetrix verify that A8513KLYTR-3-T is sourced from the original manufacturer or authorized distributors?
All A8513KLYTR-3-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-3-T meets industry standards.
7.What is the process for return or replacement of A8513KLYTR-3-T?
All A8513KLYTR-3-T units undergo pre-shipment inspection (PSI). If there is an issue with A8513KLYTR-3-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-3-T part is unused and in its original packaging.
Return procedure for A8513KLYTR-3-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
A8513KLYTR-3-T Tags
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