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Allegro MicroSystems A8513KLYTR-T
- Part No.:
- A8513KLYTR-T
- Manufacturer:
- Allegro MicroSystems
- Category:
- LED Drivers
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
A8513KLYTR-T.pdf
- Description:
- IC LED DRV RGLTR PWM 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:7,396
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Product details
Overview
A8513KLYTR-T from Allegro MicroSystems is a single-output, AEC-Q100-qualified white LED driver IC for automotive LCD backlighting. It integrates a 2 MHz current-mode boost converter with internal 60 V DMOS FET and one precision current sink, operates from 4.5–40 V input, delivers up to 150 mA LED current, and drives up to 14 series WLEDs - enabling robust start/stop and load-dump tolerant backlight systems in instrument clusters.
For engineers reviewing the A8513KLYTR-T datasheet, A8513KLYTR-T pinout, A8513KLYTR-T application, or A8513KLYTR-T equivalent, this page provides verified technical context, validated package mapping (10-pin MSOP-LY), confirmed fault-protection architecture, real-world dimming performance (5000:1 at 200 Hz), and cross-referenced alternatives for automotive display power design.
Technical Context
The A8513KLYTR-T implements a current-mode boost controller with adaptive output voltage regulation (VOUT = VLED + 0.88 V) and dual-level cycle-by-cycle current limiting (2.2 A primary, 3.5 A secondary). Its 2 MHz fixed switching frequency places operation above the AM radio band, minimizing EMI filtering requirements.
It features integrated diagnostics including open/short LED detection, OVP (1.218 V threshold at OVP pin, 55.5 V secondary at SW), UVLO (4.35 V rise / 3.90 V fall), thermal shutdown (165 °C), and fault flag assertion for external P-FET disconnect - all active during normal operation except startup-phase protections.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5 V to 40 V - supports cold-crank (≥4.5 V) and load-dump (≤40 V) transients without external protection. |
| Boost Switching Frequency | 2 MHz (typ.) - enables compact magnetics and avoids AM-band interference. |
| Max LED Current | 150 mA - set via ISET resistor; ±3% accuracy over temperature. |
| LED String Capacity | Up to 14 series white LEDs - accommodates high-brightness automotive displays. |
| PWM Dimming Ratio | 5000:1 at 200 Hz - enables precise brightness control in infotainment UIs. |
| Fault Response Time | <1 μs overvoltage detection at SW pin - triggers latched shutdown for open-diode protection. |
| Thermal Resistance | 48 °C/W (Junction-to-Ambient, LY on 4-layer PCB) - requires ≥8 thermal vias under exposed pad. |
Pinout & Package
Package: 10-pin MSOP with exposed thermal pad (LY suffix), lead-free, 100% matte tin plating. Requires solder connection of exposed pad to PCB ground plane with minimum 8 thermal vias.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| SW | Boost switch drain node | Connects to inductor and Schottky anode; handles 2.2 A peak current and 55.5 V secondary OVP clamp. |
| OVP | Output overvoltage sense input | Resistive divider input (1.218 V threshold); enables programmable VOUT OVP up to 45 V. |
| VIN | Main power input | Accepts 4.5–40 V; includes 450 mV UVLO hysteresis for stable cold-crank recovery. |
| FAULT | Open-drain fault indicator | Logic-low output signals OVP, UVP, open LED, shorted ISET, overtemperature, or boost fault. |
| VDD | Internal LDO output | Provides regulated bias; requires 0.01–0.1 μF decoupling capacitor to GND. |
| COMP | Error amplifier output & compensation node | Connect RC network here for loop stability; sources 80 μA during soft-start. |
| GND | Power and signal reference | Common return for VIN, VDD, ISET, LED, and exposed thermal pad. |
| ISET | LED current programming input | 1.003 V reference; RISET sets ILED = (RISET × 1045)/1.003 V (40–150 mA range). |
| EN/PWM | Enable and PWM dimming control | Single-pin interface: logic-high enables IC; PWM duty cycle controls brightness (250 ns turn-on/off delay). |
| LED | LED string cathode connection | Sinks regulated current; monitored for open/short detection during startup and operation. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 1 qualification | Validated for –40 °C to +125 °C ambient operation - meets automotive infotainment and cluster reliability requirements. |
| Dual-level boost switch current limit | 2.2 A cycle-by-cycle + 3.5 A secondary latch - prevents destructive inductor shorts while enabling soft-start current ramp. |
| Adaptive output voltage regulation | VOUT = VLED + 0.88 V - minimizes power loss by dynamically tracking LED string forward voltage. |
| Integrated open/short LED detection | Pre-startup LED pin pre-charge (260 mV threshold) + runtime monitoring - eliminates need for external sense resistors. |
| Secondary OVP at SW pin | 55.5 V clamp - protects internal DMOS during open-diode faults without requiring external TVS. |
| Fast PWM response | 250 ns EN/PWM-to-LED turn-on/off delay - preserves dimming fidelity at low duty cycles (<1%). |
Applications
| Automotive Instrument Cluster | Automotive Infotainment Display |
|---|---|
Use Scenario: Driving illumination of TFT-LCD gauges with variable ambient light conditions and frequent engine start-stop cycles. IC Role / Device Role / Timing Role: WLED driver providing regulated current and adaptive VOUT to maintain consistent brightness across 4.5–40 V input transients. Use Value: Eliminates external OVP/UVLO components and enables 5000:1 dimming for night/day mode transitions without flicker. |
Use Scenario: Backlighting high-resolution center-stack displays exposed to load-dump events during battery replacement or alternator faults. IC Role / Device Role / Timing Role: Fault-tolerant LED driver with latched shutdown on OVP/UVP and open-LED detection. Use Value: Prevents display blackouts during 40 V transients and ensures fail-safe indication via FAULT pin-driven system controller alert. |
| Industrial HMI Panel | Portable Medical Imaging Display |
Use Scenario: Powering ruggedized LCD backlights in factory-floor HMIs subject to wide-input industrial supplies and ESD stress. IC Role / Device Role / Timing Role: Single-chip boost+current-sink solution with integrated thermal shutdown and short-circuit protection. Use Value: Reduces BOM count by consolidating boost controller, gate driver, current sink, and protection logic into one LY-package IC. |
Use Scenario: Enabling silent, flicker-free dimming in portable ultrasound or X-ray preview screens where EMI must avoid RF-sensitive analog front-ends. IC Role / Device Role / Timing Role: 2 MHz switching LED driver minimizing conducted noise in shared power rails. Use Value: Achieves >90% efficiency at 12 V input while suppressing AM-band emissions - critical for FDA-compliant medical device EMC. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar WLED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX16832ATP+ | 40 V max input, 1.2 MHz switching, no secondary OVP at SW pin, requires external current sense resistor. | Lacks integrated open-diode protection and adaptive VOUT; suited for cost-sensitive non-automotive displays. | Choose when board space allows external sensing and secondary OVP is not required for reliability certification. |
| TPS61165DRVR | 28 V max input, 1.2 MHz, 40 V internal switch, no AEC-Q100 qualification, no latched fault modes. | Not rated for automotive transients; limited to ≤12 series LEDs and 40 mA max current. | Choose only for consumer-grade portable displays with stable 5–24 V supplies and no functional safety requirements. |
Compared with MAX16832ATP+ and TPS61165DRVR, the A8513KLYTR-T uniquely combines AEC-Q100 qualification, 40 V input tolerance, 2 MHz EMI-optimized switching, and dual-level OVP - making it the only option qualified for direct replacement in automotive cluster backlight designs requiring ISO 16750-2 compliance.
Availability
A8513KLYTR-T is available at Aetrix Electronics and suitable for automotive instrument clusters, infotainment displays, and industrial HMIs requiring stable component supply across extended temperature and transient-voltage operating conditions.
Supply support for A8513KLYTR-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, headquartered in Worcester, Massachusetts.
The A8513 product line targets automotive LCD backlighting with integrated fault protection, wide-input operation, and AEC-Q100 qualification - specifically engineered for reliability in start-stop and load-dump environments.
FAQ
What is the maximum number of white LEDs the A8513KLYTR-T can drive?
The A8513KLYTR-T can drive up to 14 series white LEDs, assuming typical forward voltage of ~3.2 V per LED and maximum output voltage headroom of ~45 V. This is enabled by its 60 V internal DMOS switch and adaptive VOUT regulation (VOUT = VLED + 0.88 V), which minimizes power loss while maintaining sufficient margin for worst-case Vf variation across temperature and unit-to-unit.
Does the A8513KLYTR-T support analog dimming in addition to PWM?
Yes, the A8513KLYTR-T supports analog dimming via the ISET pin using either a DAC-controlled single resistor or dual-resistor configuration. The internal ISET error amplifier operates linearly from 40–160 μA, allowing analog current reduction down to ~25% of full scale. However, PWM dimming remains preferred for achieving the full 5000:1 ratio - analog dimming is limited by ISET's 40–160 μA range and reference voltage accuracy.
How does the A8513KLYTR-T handle open-LED fault conditions?
The A8513KLYTR-T detects open-LED faults during both startup (via LED pin pre-charge to 260 mV) and runtime. If no current flows through the LED pin while VOUT rises to the OVP threshold (1.218 V at OVP pin), 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 - ensuring fail-safe behavior in automotive displays.
What thermal design guidelines apply to the A8513KLYTR-T's exposed pad?
The A8513KLYTR-T's exposed thermal pad must be soldered directly to the PCB ground plane with at least 8 thermal vias (0.3 mm diameter recommended). On a 4-layer JEDEC-standard board, this achieves RθJA = 48 °C/W. Insufficient thermal vias or floating pad connection will cause junction temperature to exceed 150 °C under 150 mA load, triggering thermal shutdown and compromising reliability.
Is the A8513KLYTR-T pin-compatible with other variants in the A8513 family?
No - the A8513KLYTR-T (10-pin MSOP-LY) is not pin-compatible with the A8513KLPTR-T (16-pin TSSOP-LP), despite sharing identical functionality and electrical specs. Pin counts, layouts, and terminal assignments differ significantly between LY and LP packages. Board redesign is required when substituting between these variants; only same-suffix parts (e.g., A8513KLYTR-1-T) share pinout.
A8513KLYTR-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Allegro MicroSystems
- Series:
- -
- Package/Case:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width) Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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:
- 2MHz
- 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-T FAQ
1.How can I place an order for A8513KLYTR-T through Aetrix?
Please submit a Request for Quotation (RFQ) for A8513KLYTR-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-T reliable?
The price and inventory of A8513KLYTR-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-T is usually 5 days.
3.What payment methods are accepted for A8513KLYTR-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for A8513KLYTR-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for A8513KLYTR-T?
A8513KLYTR-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your A8513KLYTR-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-T?
For technical support, including A8513KLYTR-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your A8513KLYTR-T requirements.
6.How does Aetrix verify that A8513KLYTR-T is sourced from the original manufacturer or authorized distributors?
All A8513KLYTR-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-T meets industry standards.
7.What is the process for return or replacement of A8513KLYTR-T?
All A8513KLYTR-T units undergo pre-shipment inspection (PSI). If there is an issue with A8513KLYTR-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-T part is unused and in its original packaging.
Return procedure for A8513KLYTR-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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