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Allegro MicroSystems A6261KLJTR-T
- Part No.:
- A6261KLJTR-T
- Manufacturer:
- Allegro MicroSystems
- Category:
- LED Drivers
- Package:
- 8-SOIC (0.154", 3.90mm Width) Exposed Pad
- Datasheet:
-
A6261KLJTR-T.pdf
- Description:
- IC LED DRV LIN PWM 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:5,995
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Product details
Overview
A6261KLJTR-T from Allegro MicroSystems is a linear, dual-channel programmable LED current regulator in an 8-pin SOICN package with exposed thermal pad, delivering 200 mA on LA1 and 100 mA on LA2, ±4% current accuracy, 5% current matching, and integrated short-to-ground, open-LED, and thermal protection - designed for automotive interior lighting and dashboard backlighting.
For engineers reviewing the A6261KLJTR-T datasheet, A6261KLJTR-T pinout, A6261KLJTR-T application, or A6261KLJTR-T equivalent, key selection considerations include its asymmetric dual-output capability (200/100 mA), AEC-Q100 qualification, –40°C to 125°C ambient operation, thermal foldback via THTH pin, and fault flag (FF) behavior during open-load override.
Technical Context
The A6261KLJTR-T implements two independent linear current regulators with separate output channels (LA1, LA2), each referenced to a shared 1.2 V internal IREF voltage. Current is set by external RREF connected to IREF pin, with gain factors GH1 = 25 (LA1) and GH2 = 12.5 (LA2), enabling precise asymmetric current programming without ballast resistors.
It integrates real-time protection logic: short detection triggers per-channel disablement when LAx falls below 1.2–1.8 V; open-LED detection disables all outputs after 2 ms if VIN – VLAx exceeds 170–450 mV; thermal monitoring begins current reduction at TJM = 95–130°C (adjustable via THTH pin) and shuts down at TJF ≈ 170°C with 15°C hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Configuration | Dual-channel linear current source: LA1 = 200 mA max, LA2 = 100 mA max, no shared current summation |
| Current Accuracy | ±4% over –40°C to 125°C ambient, ensuring stable luminance across automotive temperature range |
| Current Matching | ≤5% between LA1 and LA2 under matched load conditions, eliminating need for per-string ballast resistors |
| Supply Range | 6–50 V input, supporting 12 V automotive systems and higher-voltage commercial lighting rails |
| Thermal Protection | Adjustable thermal foldback (TJM = 95–130°C) and hard shutdown at ~170°C, with 2°C/W junction-to-pad resistance |
| Fault Signaling | Open-drain FF pin asserts high on short, open, or overtemperature; pulled low to override open-LED disable |
| Enable Interface | EN pin with 150–350 mV hysteresis supports direct PWM dimming without external debouncing |
Pinout & Package
Package: 8-pin SOICN (suffix LJ) with exposed thermal pad (PAD), Pb-free, 100% matte-tin leadframe plating, RθJA = 35°C/W on 4-layer JEDEC PCB.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| THTH | Thermal threshold control | Adjusts thermal foldback onset temperature (95–130°C); connect to GND to disable thermal monitor |
| IREF | Reference current input | Sets both LA1 and LA2 currents via single resistor; 1.2 V nominal reference voltage |
| GND | Ground reference | Common return for control circuitry and current regulators; must be low-impedance connection |
| LA1 | LED anode 1 output | 200 mA current source; connects to anode of first LED in string 1; disable by tying to VIN |
| LA2 | LED anode 2 output | 100 mA current source; connects to anode of first LED in string 2; disable by tying to VIN |
| EN | Enable input | Active-high logic control; 0.8 V low / 2 V high thresholds with hysteresis for noise immunity |
| FF | Fault flag output | Open-drain indicator; high = fault present (short/open/overtemp); pull low to re-enable outputs after open-LED |
| VIN | Power supply input | 6–50 V main supply for regulators and logic; bypass with 100 nF ceramic capacitor near pin |
Key Features
| Feature | Design Value |
|---|---|
| Asymmetric dual-current regulation | LA1 and LA2 independently set to 200 mA and 100 mA respectively using single RREF and internal gain ratios (GH1=25, GH2=12.5) |
| AEC-Q100 qualified | Validated for automotive applications across K-grade temperature range (–40°C to 125°C ambient) |
| Integrated fault management | Per-output short detection + global open-LED disable + thermal foldback + FF override capability reduces system-level protection components |
| Low dropout operation | 660 mV min dropout at 80 mA (LA1) and 40 mA (LA2), enabling efficient use of 12 V supply with 1–3 series LEDs |
| PWM-ready enable interface | EN pin supports direct 100 kHz+ PWM dimming with controlled current slew rate (50–110 µs) and sleep current <10 µA |
Applications
| Automotive Instrument Cluster Backlighting | Commercial HVAC Panel Indicators |
|---|---|
Use Scenario: Driving mixed-color LED strings (e.g., white for digits, red for warning icons) behind TFT-LCD overlays in vehicle dashboards. IC Role / Device Role / Timing Role: Dual-channel constant-current source regulating 200 mA for high-intensity white LEDs and 100 mA for lower-power red indicators, synchronized via shared EN pin. Use Value: Eliminates binning and external current-setting resistors while maintaining luminance uniformity across temperature and supply variation. | Use Scenario: Illuminating segmented status LEDs (power, mode, error) on industrial HVAC control panels operating in unconditioned environments. IC Role / Device Role / Timing Role: Provides robust, thermally adaptive current regulation with fault reporting (FF) to microcontroller for predictive maintenance alerts. Use Value: Enables reliable long-life operation at up to 125°C ambient without derating, with automatic current reduction preventing thermal runaway during extended runtime. |
| Truck Cab Interior Lighting | Off-Highway Equipment Control Panels |
Use Scenario: Powering distributed LED strips for map lights and step illumination in heavy-duty truck cabs subject to vibration and wide voltage transients. IC Role / Device Role / Timing Role: LA1 drives primary 200 mA white strip; LA2 powers auxiliary 100 mA amber strip; EN enables coordinated on/off and dimming. Use Value: Short-to-ground protection isolates faults without disabling entire lighting system; FF signal enables diagnostic logging in telematics modules. | Use Scenario: Controlling status and warning LEDs on ruggedized control interfaces for construction and agricultural machinery. IC Role / Device Role / Timing Role: Functions as fault-tolerant LED driver with open-LED override (FF pull-down) to maintain partial visibility during single-LED failure. Use Value: Ensures operational continuity in safety-critical environments where full LED array failure would impair operator situational awareness. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED current regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AL8862SP-7 | Single-channel 150 mA buck LED driver; requires external inductor; no thermal foldback or open-LED disable | Lower BOM cost but lacks fault isolation and multi-string flexibility; not AEC-Q100 qualified | Choose for cost-sensitive non-automotive applications where only one LED string is needed and thermal margin is ample |
| TPS92692QPWPRQ1 | Dual-channel 200 mA linear driver with identical LA1/LA2 symmetry; includes I2C interface and analog dimming; higher quiescent current (250 µA) | Supports digital diagnostics and programmable fault thresholds but requires additional MCU resources | Choose when system-level configurability and telemetry outweigh simplicity and ultra-low sleep current (<10 µA) |
Compared with AL8862SP-7 and TPS92692QPWPRQ1, the A6261KLJTR-T uniquely delivers asymmetric dual-current regulation (200/100 mA) in a compact SOICN package with automotive-grade thermal protection and zero-component open-LED override - making it optimal for mixed-intensity LED arrays where space, reliability, and fault resilience are prioritized over digital control.
Availability
A6261KLJTR-T is available at Aetrix Electronics and suitable for automotive instrument clusters, commercial HVAC panels, truck cab lighting, and off-highway equipment control interfaces requiring stable component supply and AEC-Q100 compliance.
Supply support for A6261KLJTR-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 drivers for automotive and industrial markets.
The A6261 product line is engineered specifically for protected, thermally robust LED array driving in harsh environments - emphasizing fault resilience, AEC-Q100 qualification, and simplified design through integrated protection and asymmetric current capability.
FAQ
What is the maximum continuous output current per channel for A6261KLJTR-T?
The A6261KLJTR-T provides 200 mA maximum on LA1 and 100 mA maximum on LA2, confirmed by the Selection Guide and Electrical Characteristics table (ILAN1 = –200 mA, ILAN0 = –100 mA). These values are guaranteed at TJ ≤ 150°C with adequate thermal dissipation; actual current depends on RREF value and thermal conditions.
How does the A6261KLJTR-T handle an open LED condition?
When an open LED is detected (VIN – VLAx > 170–450 mV for >2 ms), the A6261KLJTR-T disables all outputs and asserts FF high. To restore operation, pull FF low externally - this overrides the open-LED lockout and re-enables active channels. This behavior is documented in the Functional Description and Open-Load Detection section.
Can the thermal foldback threshold of A6261KLJTR-T be adjusted, and how?
Yes, the thermal foldback onset temperature (TJM = 95–130°C) of the A6261KLJTR-T is adjustable via the THTH pin. Connecting a resistor between THTH and GND lowers VTHTH and increases TJM; connecting to a >1 V reference raises VTHTH and decreases TJM. Figure 3a and 3b in the datasheet provide the voltage–temperature and resistor–voltage relationships.
Is A6261KLJTR-T pin-compatible with other A6261 variants like A6261KLJTR-T-1?
No, A6261KLJTR-T is not pin-compatible with A6261KLJTR-T-1. While both use the same 8-pin SOICN package, A6261KLJTR-T-1 delivers 200 mA on both LA1 and LA2, whereas A6261KLJTR-T delivers 200 mA on LA1 and 100 mA on LA2 - requiring different RREF values and distinct current-setting calculations per channel.
What protection features are integrated into the A6261KLJTR-T?
The A6261KLJTR-T integrates short-to-ground detection per output (1.2–1.8 V threshold), open-LED detection (2 ms delay), thermal foldback (adjustable 95–130°C onset), overtemperature shutdown (~170°C), and EN-controlled sleep mode (<10 µA). All protections feed into the open-drain FF pin for system-level fault reporting.
A6261KLJTR-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Allegro MicroSystems
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width) Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Linear
- Topology:
- -
- Internal Switch(s):
- Yes
- Number of Outputs:
- 4
- Voltage - Supply (Min):
- 6V
- Voltage - Supply (Max):
- 50V
- Voltage - Output:
- -
- Current - Output / Channel:
- 100mA, 200mA
- Frequency:
- -
- Dimming:
- PWM
- Applications:
- -
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC-EP
A6261KLJTR-T FAQ
1.How can I place an order for A6261KLJTR-T through Aetrix?
Please submit a Request for Quotation (RFQ) for A6261KLJTR-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 A6261KLJTR-T reliable?
The price and inventory of A6261KLJTR-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for A6261KLJTR-T is usually 5 days.
3.What payment methods are accepted for A6261KLJTR-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for A6261KLJTR-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for A6261KLJTR-T?
A6261KLJTR-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your A6261KLJTR-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 A6261KLJTR-T?
For technical support, including A6261KLJTR-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your A6261KLJTR-T requirements.
6.How does Aetrix verify that A6261KLJTR-T is sourced from the original manufacturer or authorized distributors?
All A6261KLJTR-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 A6261KLJTR-T meets industry standards.
7.What is the process for return or replacement of A6261KLJTR-T?
All A6261KLJTR-T units undergo pre-shipment inspection (PSI). If there is an issue with A6261KLJTR-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 A6261KLJTR-T part is unused and in its original packaging.
Return procedure for A6261KLJTR-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
A6261KLJTR-T Tags
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BCR402RE6327HTSA1
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BCR430UXTSA2
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LYT1604D-TL
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