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

Allegro MicroSystems A8503EECTR-T

Name: A8503EECTR-T
Brand: Allegro MicroSystems
SKU: A8503EECTR-T
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: A8503EECTR-T

Manufacturer:: Allegro MicroSystems

Category:: LED Drivers

Package:: 26-WFQFN Exposed Pad

Datasheet:: A8503EECTR-T.pdf

Description:: IC LED DRVR RGLTR PWM 25MA 26QFN

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Product details

Overview

A8503EECTR-T from Allegro MicroSystems is a 26-lead QFN/MLP ultra-small WLED/RGB LED driver IC for medium-size display backlighting, integrating a 50 V/2 A boost converter and six 25 mA current sinks, supporting up to 10-series × 6-parallel LED configurations (V_f ≤ 3.7 V) with 500:1 PWM dimming ratio.

For engineers reviewing the A8503EECTR-T datasheet, A8503EECTR-T pinout, A8503EECTR-T application, or A8503EECTR-T equivalent, key selection considerations include input voltage range (4.3–5.5 V), open/short LED string protection, latch-or-autorestart fault mode selection via MODE pin, and thermal/overvoltage/UVLO safeguards for reliable display power management.

Technical Context

The A8503EECTR-T implements a constant-frequency current-mode boost converter with integrated 50 V DMOS switch, enabling efficient high-side LED driving from a single 4.3–5.5 V supply. Its six independent current sinks support precise active current sharing across parallel LED strings for tight matching (±1.5% typical).

Protection architecture includes pulse-by-pulse current limiting, overtemperature shutdown, open-diode detection, and selectable fault response-latch-off when MODE = low, autorestart when MODE = VIN-ensuring robust operation in compact display systems.

Key Specifications

Parameter	Value and Actual Design Meaning
Input Voltage Range	4.3 V to 5.5 V - supports direct connection to single-cell Li-ion or USB-powered systems without external regulation.
Boost Output Voltage	Up to 50 V - sufficient to drive up to 10-series white LEDs (3.7 V each) or RGB strings with margin.
LED Sink Current	25 mA per channel - enables uniform brightness across 6 parallel strings at full load.
PWM Dimming Ratio	500:1 - provides fine-grained luminance control for medium-display backlighting without color shift.
Operating Temperature	−40 °C to +85 °C - qualified for industrial and consumer display environments without derating.
Fault Response Mode	Selectable latch or autorestart - configured by MODE pin logic level, enabling system-level fault recovery strategy alignment.

Pinout & Package

Package: 4 mm × 4 mm, 26-lead QFN/MLP (exposed pad), RoHS-compliant, moisture sensitivity level (MSL) 3.

Pin/Terminal	Circuit Role	Design Meaning
VIN	Input Power Supply	Connects to 4.3–5.5 V source; feeds boost converter input and internal LDOs.
SW	Boost Switch Node	Connection point for external boost inductor and flyback diode/anode.
FB	Feedback Input	Monitors boost output voltage via resistor divider for regulated 50 V max output.
EN	Enable Control	Active-high digital enable; toggling resets latched fault condition when MODE = low.
MODE	Fault Mode Select	Low = latch-off on fault; high = autorestart; determines system-level fault handling behavior.
LED1–LED6	Current Sink Outputs	Each drives one LED string cathode; supports active current sharing for ±1.5% matching.
PGND	Power Ground	High-current return path for boost switch and LED sinks; connects to exposed thermal pad.

Key Features

Feature	Design Value
Integrated 50 V/2 A DMOS Boost Switch	Eliminates external high-voltage MOSFET, reducing BOM count and PCB area in space-constrained displays.
Active Current Sharing Across 6 Sinks	Ensures ±1.5% current matching between parallel LED strings without external sensing resistors.
Open/Short LED String Protection	Detects and responds to open-circuit or short-circuit faults on any of the 6 LED channels, preventing thermal runaway.
Selectably Latching or Autorestarting Fault Mode	Enables flexible system-level fault recovery design via single MODE pin configuration.
500:1 PWM Dimming with Duty Cycle Control	Delivers flicker-free, high-contrast backlight control without affecting LED forward voltage or color point.

Applications

Smartphone Backlighting	Tablet Display Backlight
Use Scenario: Driving 6 parallel strings of 8–10 series white LEDs in a 7–10 inch LCD panel with dynamic brightness control. IC Role / Device Role / Timing Role: Primary WLED driver IC providing regulated current, PWM dimming, and fault protection for display backlight subsystem. Use Value: Enables compact 4 mm × 4 mm solution with 500:1 dimming range and ±1.5% current matching for consistent screen luminance.	Use Scenario: Powering RGB LED backlight in portable media player with color gamut expansion and ambient light-adaptive dimming. IC Role / Device Role / Timing Role: Multi-channel RGB LED driver delivering independent current control per color channel with shared boost stage. Use Value: Supports accurate white point tuning and smooth color transitions using active current sharing across R/G/B strings.
Automotive Infotainment Displays	Industrial HMI Panels
Use Scenario: Backlighting 5–7 inch automotive center-stack displays operating across −40 °C to +85 °C ambient. IC Role / Device Role / Timing Role: Robust LED driver with latch-mode fault response for safety-critical display power management. Use Value: Ensures fail-safe operation via UVLO, OTP, and open/short LED detection-preventing uncontrolled LED current under fault conditions.	Use Scenario: Illuminating ruggedized 4.3–8 inch industrial touchscreens exposed to variable temperature and ESD stress. IC Role / Device Role / Timing Role: High-integration WLED driver with integrated protection and minimal external components for long-lifecycle designs. Use Value: Reduces bill-of-materials and improves reliability with built-in overvoltage, open-diode, and thermal shutdown functions.

Smartphone Backlighting

Tablet Display Backlight

Use Scenario: Driving 6 parallel strings of 8–10 series white LEDs in a 7–10 inch LCD panel with dynamic brightness control.

IC Role / Device Role / Timing Role: Primary WLED driver IC providing regulated current, PWM dimming, and fault protection for display backlight subsystem.

Use Value: Enables compact 4 mm × 4 mm solution with 500:1 dimming range and ±1.5% current matching for consistent screen luminance.

Use Scenario: Powering RGB LED backlight in portable media player with color gamut expansion and ambient light-adaptive dimming.

IC Role / Device Role / Timing Role: Multi-channel RGB LED driver delivering independent current control per color channel with shared boost stage.

Use Value: Supports accurate white point tuning and smooth color transitions using active current sharing across R/G/B strings.

Automotive Infotainment Displays

Industrial HMI Panels

Use Scenario: Backlighting 5–7 inch automotive center-stack displays operating across −40 °C to +85 °C ambient.

IC Role / Device Role / Timing Role: Robust LED driver with latch-mode fault response for safety-critical display power management.

Use Value: Ensures fail-safe operation via UVLO, OTP, and open/short LED detection-preventing uncontrolled LED current under fault conditions.

Use Scenario: Illuminating ruggedized 4.3–8 inch industrial touchscreens exposed to variable temperature and ESD stress.

IC Role / Device Role / Timing Role: High-integration WLED driver with integrated protection and minimal external components for long-lifecycle designs.

Use Value: Reduces bill-of-materials and improves reliability with built-in overvoltage, open-diode, and thermal shutdown functions.

Equivalent & Alternatives

The following parts are listed as comparable options for similar WLED/RGB driver applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
TPS61165DRVR	Single-string 30 mA sink; no integrated current sharing; requires external sense resistors for multi-string matching.	Limited to ≤4 parallel strings; lacks open/short LED detection per channel.	Preferred where cost-sensitive, lower-channel-count backlighting suffices and layout space allows discrete sensing.
MAX16832ATP+	6-channel linear LED driver (no boost); max 36 V output; requires external boost stage for >36 V LED strings.	Not suitable for 10-series LED stacks without added DC-DC; higher power dissipation in linear mode.	Selected when low-noise, low-EMI operation is prioritized over efficiency in low-V_f or low-string-count designs.

Compared with TPS61165DRVR and MAX16832ATP+, the A8503EECTR-T uniquely integrates a 50 V boost converter with active current sharing across six sinks-enabling compact, high-efficiency, and fault-resilient medium-display backlighting without external sensing or boost circuitry.

Availability

A8503EECTR-T is available at Aetrix Electronics and suitable for smartphone backlighting, tablet display backlight, and automotive infotainment displays requiring stable component supply, extended temperature operation, and integrated fault protection.

Supply support for A8503EECTR-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 magnetic sensors, power ICs, and motor driver solutions, founded in 1989 and headquartered in Worcester, MA.

The A8503 product line targets ultra-compact, high-efficiency LED backlight drivers for medium-format displays-emphasizing integration, thermal resilience, and robust fault management in space- and reliability-constrained applications.

FAQ

What is the maximum number of LEDs the A8503EECTR-T can drive?

The A8503EECTR-T supports up to 10-series × 6-parallel LED configurations, accommodating up to 60 LEDs total at 25 mA per string. Each of its six current sinks handles one parallel string, and the integrated 50 V boost converter ensures sufficient headroom for 10-series white LEDs (V_f ≤ 3.7 V). The A8503EECTR-T datasheet confirms this topology under "Electrical Characteristics" and "Typical Application" sections.

Does the A8503EECTR-T require external current-sense resistors?

No, the A8503EECTR-T does not require external current-sense resistors. It uses internal precision current mirrors and active current sharing across its six LED sinks to achieve ±1.5% matching without external components. This architecture is confirmed in the "Features" and "Functional Block Diagram" sections of the official Allegro A8503 datasheet.

How does the MODE pin affect fault handling in the A8503EECTR-T?

The MODE pin selects fault response behavior in the A8503EECTR-T: pulled low, it enables latch-off mode (requires VIN recycle or EN toggle to clear); pulled high to VIN, it enables autorestart mode (automatic recovery after fault clears). This dual-mode capability is explicitly documented in the "Fault Protection" section of the A8503EECTR-T datasheet and verified on Allegro's product page.

What is the thermal pad connection requirement for the A8503EECTR-T MLP-26 package?

The A8503EECTR-T uses a 4 mm × 4 mm MLP-26 package with an exposed thermal pad that must be soldered to a dedicated PGND copper pour for optimal thermal performance and electrical integrity. Allegro's recommended footprint specifies solder mask-defined pads and thermal vias to inner ground planes-details are provided in the "Package Dimensions" and "Layout Guidelines" sections of the A8503EECTR-T datasheet.

Is the A8503EECTR-T compatible with 3.3 V logic-level PWM inputs?

Yes, the A8503EECTR-T accepts 3.3 V logic-level PWM signals on its DIM pin. Its PWM interface is designed for standard CMOS-compatible inputs with VIH ≥ 2.0 V and VIL ≤ 0.8 V, making it interoperable with common microcontrollers and PMICs. This specification is listed in the "Absolute Maximum Ratings" and "Electrical Characteristics" tables of the A8503EECTR-T datasheet.

A8503EECTR-T Specifications

Product attributes: Attribute value

Manufacturer:: Allegro MicroSystems

Series:: -

Package/Case:: 26-WFQFN Exposed Pad

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Type:: DC DC Regulator

Topology:: Step-Up (Boost)

Internal Switch(s):: Yes

Number of Outputs:: 6

Voltage - Supply (Min):: 4.3V

Voltage - Supply (Max):: 5.5V

Voltage - Output:: -

Current - Output / Channel:: 25mA

Frequency:: -

Dimming:: PWM

Applications:: Backlight

Operating Temperature:: -40°C ~ 85°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 26-QFN/MLP (4x4)

A8503EECTR-T FAQ

1.How can I place an order for A8503EECTR-T through Aetrix?

Please submit a Request for Quotation (RFQ) for A8503EECTR-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 A8503EECTR-T reliable?

The price and inventory of A8503EECTR-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for A8503EECTR-T is usually 5 days.

3.What payment methods are accepted for A8503EECTR-T?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for A8503EECTR-T transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for A8503EECTR-T?

A8503EECTR-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your A8503EECTR-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 A8503EECTR-T?

For technical support, including A8503EECTR-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your A8503EECTR-T requirements.

6.How does Aetrix verify that A8503EECTR-T is sourced from the original manufacturer or authorized distributors?

All A8503EECTR-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 A8503EECTR-T meets industry standards.

7.What is the process for return or replacement of A8503EECTR-T?

All A8503EECTR-T units undergo pre-shipment inspection (PSI). If there is an issue with A8503EECTR-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 A8503EECTR-T part is unused and in its original packaging.

Return procedure for A8503EECTR-T:

1.Submit a request within 90 days.

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

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