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Allegro MicroSystems A8510GECTR-T
- Part No.:
- A8510GECTR-T
- Manufacturer:
- Allegro MicroSystems
- Category:
- LED Drivers
- Package:
- 26-WFQFN Exposed Pad
- Datasheet:
-
A8510GECTR-T.pdf
- Description:
- IC LED DRVR RGLTR PWM 40MA 26QFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,628
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Product details
Overview
A8510GECTR-T from Allegro MicroSystems is a multi-output white LED driver IC for LCD backlighting, integrating a current-mode boost converter with internal 60 V DMOS switch and eight precision current sinks. It delivers up to 40 mA per channel across 8 strings, supports 5–40 V input, and provides synchronized switching up to 2.3 MHz - enabling high-efficiency driving of up to 96 LEDs (12 per string) in industrial and automotive display systems.
For engineers reviewing the A8510GECTR-T datasheet, A8510GECTR-T pinout, A8510GECTR-T application, or A8510GECTR-T equivalent, this page details its fault-tolerant LED sink architecture, dual-level current limiting, thermal/overvoltage/open-LED protection, and single-supply operation - critical for robust backlight design in infotainment and industrial LCDs.
Technical Context
The A8510GECTR-T implements a current-mode boost controller with adaptive output voltage regulation (VOUT = max(VLED1–VLED8) + 0.68 V), minimizing power loss by dynamically tracking the highest-string forward voltage. Its dual-level cycle-by-cycle current limit enables soft-start (700 mA) and overload protection (3.5 A typical), while internal bias generation allows full functionality from 5 V startup.
Synchronization via FSET/SYNC supports system-wide clock alignment from 580 kHz to 2.3 MHz with 150 ns minimum pulse width requirements; APWM pin enables fine analog-current trimming (20–1000 kHz), and EN/PWM combines enable control with PWM dimming (200 Hz–1 kHz) and sub-500 ns turn-on/off delay for high-fidelity brightness control.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 5 V to 40 V - supports wide-range industrial power rails and battery-backed displays without external regulators. |
| LED Current per Channel | Up to 40 mA - precise current sinking across all 8 channels with ±3% accuracy and 0.8% LED-to-LED matching. |
| Boost Switch Rating | 60 V DMOS with 300 mΩ RDS(on) - enables high-efficiency step-up conversion for 12-series white LED strings (Vf ≈ 3.5 V). |
| Switching Frequency Range | 580 kHz to 2.3 MHz - adjustable via FSET/SYNC resistor or external clock; supports EMI optimization and compact magnetics. |
| Protection Features | Output short/overvoltage, open/shorted LED pin, overtemperature (165°C shutdown), and VIN UVLO (4.35 V rise / 3.9 V fall). |
| Thermal Resistance | RθJA = 48.5 °C/W on 2-layer PCB - requires exposed pad soldering with ≥8 thermal vias for sustained 40 mA/channel operation. |
| Digital Interface Pins | Single EN/PWM pin for enable + PWM dimming; APWM pin for analog current trimming; FSET/SYNC for frequency setting/sync. |
Pinout & Package
The A8510GECTR-T is housed in a 26-pin, 4 mm × 4 mm, 0.75 mm nominal height QFN package with exposed thermal pad (suffix EC), lead-free and 100% matte tin-plated.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Input power and current-sense reference | Supplies internal circuitry and serves as positive reference for RSC; must exceed 4.35 V to exit UVLO. |
| FAULT | Open-drain fault indicator | Pulled low during OVP, overtemp, LED open/short, or SW overcurrent; requires 100 kΩ pull-up to logic rail. |
| COMP | Error amplifier output | Compensation node for boost loop stability; requires RZ/CZ network to GND per design. |
| EN/PWM | Enable and PWM dimming input | Logic-high enables IC and sets 100% LED current; PWM at 200 Hz–1 kHz modulates brightness with <500 ns delay. |
| FSET/SYNC | Frequency setting and synchronization | Resistor-to-GND sets fSW (580 kHz–2.3 MHz); accepts external clock for system-level timing alignment. |
| ISET | LED current reference input | RISET resistor sets full-scale current (e.g., 8.25 kΩ → 40 mA); internal 1.003 V reference enables accurate scaling. |
| LED1–LED8 | Current sink outputs | Cathode connections for up to 8 independent LED strings; each regulates current with 680 mV compliance voltage. |
| VGATE | External P-MOSFET gate driver | Drives high-side disconnect switch during fault; shuts down in ≤3 µs when overvoltage or thermal event occurs. |
| VSENSE | Current sense negative input | Measures voltage drop across RSC; threshold is VIN – VSENSE = 180 mV for current-limit detection. |
| OVP | Overvoltage protection sense | Monitors VOUT via ROVP divider; triggers shutdown if sensed voltage exceeds 8.1 V (typical) threshold. |
| SW | Internal boost switch drain | Connects to boost inductor; rated for 62 V transient and 3.5 A continuous switching current. |
| PGND | Power ground return | Low-impedance return path for boost switch and LED sinks; separate from AGND to minimize noise coupling. |
Key Features
| Feature | Design Value |
|---|---|
| Adaptive Boost Output Regulation | Maintains minimal VOUT = max(VLED1–VLED8) + 0.68 V, reducing power dissipation and heat in LED strings. |
| Dual-Level Cycle-by-Cycle Current Limit | Soft-start limit (700 mA) prevents inrush; main limit (3.5 A typ.) protects internal switch during faults. |
| Integrated Input Disconnect Driver | VGATE pin drives external P-MOSFET to isolate VIN during OVP, overtemp, or LED fault - enhancing system safety. |
| High-Accuracy LED Current Matching | 0.8% typical LED-to-LED matching ensures uniform brightness across multi-string LCD backlights. |
| Robust Fault Detection Suite | Detects open/shorted LED pins, LED-to-GND shorts, overvoltage (primary + secondary 55 V), and thermal shutdown (165°C). |
| Flexible Dimming Architecture | EN/PWM enables standard PWM dimming; APWM adds 20–1000 kHz digital trimming for color balance or contrast optimization. |
Applications
| Automotive Infotainment Displays | Industrial HMI Panels |
|---|---|
|
Use Scenario: Backlighting 7–12 inch TFT-LCDs in vehicle dashboards and center consoles under wide temperature (-40°C to 105°C) and supply (9–16 V battery) conditions. IC Role / Device Role / Timing Role: LED driver IC providing regulated current to 8 parallel LED strings, with adaptive VOUT and fault isolation via VGATE-driven PMOS. Use Value: Ensures consistent luminance despite varying LED Vf drift and input transients, while OVP and thermal shutdown prevent damage during load dump or hot-cranking events. |
Use Scenario: Driving high-brightness LCD backlights in factory automation HMIs exposed to EMI-rich environments and 24 V DC industrial power. IC Role / Device Role / Timing Role: Multi-channel constant-current source with synchronized switching (≤2.3 MHz) to reduce conducted EMI and simplify filter design. Use Value: Enables compact, low-noise power stage layout using small inductors and ceramic capacitors, meeting CISPR-25 Class 5 emissions limits. |
| Medical Diagnostic Monitors | Avionics Display Systems |
|
Use Scenario: Powering clinical-grade LCD backlights requiring flicker-free dimming, long-term current stability, and fail-safe fault reporting. IC Role / Device Role / Timing Role: Precision LED current sink with <0.8% matching and open/short LED detection, feeding FAULT signal to system MCU for diagnostic logging. Use Value: Eliminates visible brightness variation across display zones and provides deterministic fault response for IEC 62304 Class C software compliance. |
Use Scenario: Backlighting certified avionics displays operating from 28 V aircraft bus with strict DO-160 lightning surge and thermal derating requirements. IC Role / Device Role / Timing Role: High-reliability LED driver with 165°C thermal shutdown, 55 V secondary OVP, and UVLO hysteresis (450 mV) for stable startup after brownouts. Use Value: Maintains display visibility during engine start transients and meets RTCA DO-160 Section 22 Level A lightning-induced surge immunity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM3409QMYX/NOPB | Single-channel buck-boost LED driver; no integrated current sinks; requires external MOSFET and sense resistors. | Designed for single-string high-power LEDs (up to 1.5 A), not multi-string LCD backlighting. | Choose LM3409QMYX/NOPB only when driving one high-current string with programmable analog dimming - not for 8-channel parallel backlighting. |
| TPS61165DRVR | Single-output boost LED driver with 30 V switch; lacks LED open/short detection, thermal shutdown, and multi-string current matching. | Targeted at small displays (≤3.5") with ≤50 mA total current; no fault reporting or adaptive VOUT regulation. | Use TPS61165DRVR for cost-sensitive portable displays where 8-channel precision and fault tolerance are not required. |
Compared with LM3409QMYX/NOPB and TPS61165DRVR, the A8510GECTR-T uniquely integrates eight matched current sinks, adaptive output regulation, comprehensive fault detection, and system-level sync capability - making it purpose-built for high-reliability, multi-string LCD backlighting rather than generic LED driving.
Availability
A8510GECTR-T is available at Aetrix Electronics and suitable for industrial HMI panels, automotive infotainment displays, and medical diagnostic monitors requiring stable component supply, long lifecycle support, and AEC-Q100-compliant performance.
Supply support for A8510GECTR-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, industrial, and aerospace markets.
The A8510 product line is designed specifically for fault-tolerant, multi-string LCD backlighting in demanding environments - emphasizing precision current matching, adaptive efficiency, and robust protection for displays in vehicles, factories, and critical equipment.
FAQ
What is the maximum number of LEDs the A8510GECTR-T can drive, and under what conditions?
The A8510GECTR-T can drive up to 96 white LEDs - 12 LEDs in series per string across all 8 current sinks - at 40 mA per string, assuming Vf ≈ 3.5 V and VIN ≥ 8 V. The boost converter's adaptive output regulation (VOUT = max(VLED1–VLED8) + 0.68 V) ensures minimal overhead voltage, maximizing efficiency. Higher LED counts require paralleling sinks or reducing per-string current.
How does the A8510GECTR-T handle LED string faults such as open or shorted connections?
The A8510GECTR-T performs automatic LED pin detection during power-up: it checks each LEDx pin for voltages <70 mV (short-to-GND, halting startup), 150 mV (unused, disabling that string), or >325 mV (active string). During operation, it continuously monitors for open/shorted LED pins and reports faults via the open-drain FAULT pin, while also triggering thermal shutdown at 165°C and secondary OVP at 55 V.
Can the A8510GECTR-T synchronize its switching frequency with other converters in the same system?
Yes - the A8510GECTR-T supports synchronization via its FSET/SYNC pin, accepting external clock signals from 580 kHz to 2.3 MHz with minimum 150 ns on/off times. When synchronized, the SW node aligns precisely to the external clock without LED current variation, enabling EMI reduction and deterministic timing in multi-rail systems. Loss of SYNC causes automatic reversion to the resistor-set frequency.
What is the role of the VGATE pin on the A8510GECTR-T, and how is it used in system protection?
The VGATE pin on the A8510GECTR-T drives the gate of an external P-MOSFET to disconnect the input supply (VIN) during fault conditions. Upon OVP, overtemperature, or LED fault detection, VGATE pulls low within 3 µs, turning off the PMOS and isolating downstream circuitry. This enhances system safety by preventing fault propagation and enabling controlled shutdown sequences in automotive and industrial designs.
How does the APWM pin on the A8510GECTR-T differ from the EN/PWM pin in terms of dimming functionality?
The EN/PWM pin controls coarse on/off LED current with 200 Hz–1 kHz PWM, offering fast turn-on/off (<500 ns) for standard brightness modulation. In contrast, the APWM pin accepts 20–1000 kHz digital signals to fine-tune the ISET reference current - enabling analog-like dimming resolution, color balancing across LED bins, or contrast ratio maximization without PWM artifacts, while EN/PWM remains high.
A8510GECTR-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Allegro MicroSystems
- Series:
- -
- Package/Case:
- 26-WFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- DC DC Regulator
- Topology:
- Step-Up (Boost)
- Internal Switch(s):
- Yes
- Number of Outputs:
- 8
- Voltage - Supply (Min):
- 5V
- Voltage - Supply (Max):
- 40V
- Voltage - Output:
- -
- Current - Output / Channel:
- 40mA
- Frequency:
- -
- Dimming:
- PWM
- Applications:
- Backlight
- Operating Temperature:
- -40°C ~ 105°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 26-QFN/MLP (4x4)
A8510GECTR-T FAQ
1.How can I place an order for A8510GECTR-T through Aetrix?
Please submit a Request for Quotation (RFQ) for A8510GECTR-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 A8510GECTR-T reliable?
The price and inventory of A8510GECTR-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for A8510GECTR-T is usually 5 days.
3.What payment methods are accepted for A8510GECTR-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for A8510GECTR-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for A8510GECTR-T?
A8510GECTR-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your A8510GECTR-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 A8510GECTR-T?
For technical support, including A8510GECTR-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your A8510GECTR-T requirements.
6.How does Aetrix verify that A8510GECTR-T is sourced from the original manufacturer or authorized distributors?
All A8510GECTR-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 A8510GECTR-T meets industry standards.
7.What is the process for return or replacement of A8510GECTR-T?
All A8510GECTR-T units undergo pre-shipment inspection (PSI). If there is an issue with A8510GECTR-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 A8510GECTR-T part is unused and in its original packaging.
Return procedure for A8510GECTR-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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