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Allegro MicroSystems A6261KLYTR-T
- Part No.:
- A6261KLYTR-T
- Manufacturer:
- Allegro MicroSystems
- Category:
- LED Drivers
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
A6261KLYTR-T.pdf
- Description:
- IC LED DRVR LIN PWM 100MA 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:10,505
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Product details
Overview
A6261KLYTR-T from Allegro MicroSystems is a linear, programmable LED current regulator in 10-pin MSOP package with exposed thermal pad, delivering up to 100 mA per channel across four matched outputs (LA1–LA4), ±4% current accuracy, and integrated short-to-ground, open-LED, and thermal protection for automotive lighting systems.
For engineers reviewing the A6261KLYTR-T datasheet, A6261KLYTR-T pinout, A6261KLYTR-T application, or A6261KLYTR-T equivalent, key selection considerations include its 6–50 V supply range, 1.2 V reference voltage, 10% current matching without ballast resistors, PWM enable control, and AEC-Q100 qualification for –40°C to 125°C ambient operation.
Technical Context
The A6261KLYTR-T implements four independent linear current regulators with shared IREF input, each sourcing current from VIN to LAx pins using internal GH0 = 12.5 gain ratio. It features analog thermal foldback activated at TJM = 95–130°C, with current reduction slope of –2.5%/°C, and fault detection via open-drain FF output indicating short, open, or overtemperature events.
Its architecture supports parallel LED string configuration with disable-on-open-LED behavior, slew-rate-limited PWM dimming (50–110 µs), and configurable thermal threshold via THTH pin. Protection logic disables affected outputs during short-to-ground (VSCD = 1.2–1.8 V) while maintaining regulation on remaining strings.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Channels | 4 independent current sources (LA1–LA4), all active in LY package |
| Max Output Current | 100 mA per channel (ILAN0 = –95 to –105 mA), set by IREF resistor |
| Current Accuracy | ±4% typical (EILAx), enabling precise brightness control without calibration |
| Current Matching | Better than 10% (EIMLAx ≤ 5% typ), eliminating need for external ballast resistors |
| Supply Voltage Range | 6–50 V (VIN), supporting 12 V automotive nets and higher-voltage industrial rails |
| Thermal Threshold | Adjustable activation at 95–130°C (TJM), with foldback reducing current to 25% at TJL = 120–150°C |
| Short Detect Voltage | 1.2–1.8 V (VSCD), triggering fast disable (<1 ms) on LAx short-to-GND |
| Enable Input Logic | VIL ≤ 0.8 V / VIH ≥ 2 V with 150–350 mV hysteresis, compatible with standard CMOS/PWM drivers |
Pinout & Package
Package: 10-pin MSOP with exposed thermal pad (suffix LY), RoHS-compliant, 100% matte-tin leadframe plating, optimized for thermal dissipation (RθJA = 48°C/W on 4-layer PCB).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| LA1–LA4 | LED anode current source outputs | Four matched high-side current sinks; connect to LED anodes; each capable of –100 mA continuous |
| VIN | Main power input | Supplies control circuitry and all current regulators; bypass with 100 nF ceramic capacitor to GND |
| GND | Ground reference | Common return path for all internal circuits and external bypass caps; must be low-impedance connection |
| EN | Enable logic input | Active-high digital control; enables/disables all outputs; supports direct PWM dimming with 5–30 µs startup time |
| FF | Fault flag output | Open-drain indicator (VOL ≤ 0.4 V @ 1 mA); goes high during short, open, or overtemperature faults |
| IREF | Reference current input | Accepts 1.2 V reference; sets all output currents via RREF to GND (ILAx = 12.5 × IREF) |
| THTH | Thermal threshold adjust | Analog input to configure thermal foldback onset temperature (TJM); floating = default 115°C typ |
| PAD | Exposed thermal pad | Internally connected to GND; must be soldered to PCB copper pour for thermal performance and EMI reduction |
Key Features
| Feature | Design Value |
|---|---|
| Programmable current via single resistor | One external RREF sets all four output currents simultaneously, simplifying BOM and layout |
| AEC-Q100 qualified | Validated for automotive applications across –40°C to 125°C ambient, including HTOL and ESD testing |
| Integrated fault diagnostics | Single FF pin reports short-to-ground, open-LED, and overtemperature conditions with override capability |
| Thermal foldback with adjustable threshold | Reduces LED current gradually above TJM to prevent thermal runaway without abrupt shutdown |
| Low dropout voltage | 660–800 mV at rated load, enabling efficient operation with 1–3 series LEDs on 12 V supplies |
| PWM-compatible enable input | Fast turn-on/turn-off (5–30 µs) and current slew limiting (50–110 µs) ensure clean dimming waveforms |
Applications
| Automotive Exterior Lighting | Commercial Signage |
|---|---|
Use Scenario: Driving multiple parallel strings of white LEDs in tail lamps, brake lights, or daytime running lights (DRLs) on 12 V vehicle electrical systems. IC Role / Device Role / Timing Role: High-side constant-current regulator providing matched illumination across four LED channels with fault-safe shutdown. Use Value: Ensures consistent luminance, eliminates thermal derating concerns via foldback, and meets automotive reliability requirements with AEC-Q100 certification. | Use Scenario: Powering segmented LED arrays in indoor/outdoor signage where uniform brightness and long service life are critical. IC Role / Device Role / Timing Role: Precision current source enabling synchronized PWM dimming across multiple zones without color shift. Use Value: Delivers ±4% current accuracy and <10% inter-channel mismatch, reducing binning costs and improving visual consistency. |
| Industrial Control Panels | Medical Device Indicators |
Use Scenario: Illuminating status indicators and backlighting on HMI panels operating in harsh environments with wide temperature swings. IC Role / Device Role / Timing Role: Robust LED driver with open-load detection and thermal management for fail-safe operation in unattended equipment. Use Value: Prevents false alarms via automatic disable-on-open-LED and maintains safe junction temperatures even at 85°C ambient. | Use Scenario: Driving low-noise, flicker-free indicator LEDs in diagnostic and therapeutic devices requiring EMI-controlled operation. IC Role / Device Role / Timing Role: Low-EMI linear regulator with exposed thermal pad grounding, minimizing conducted noise in sensitive analog signal paths. Use Value: Eliminates switching noise inherent in DC-DC drivers, ensuring compliance with medical EMC standards (IEC 60601-1-2). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED current regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AL8863Q-7 | Switching buck LED driver (not linear); 3 A max output; requires external inductor; no integrated thermal foldback | Better efficiency (>90%) in high-power designs but introduces EMI and complexity; lacks AEC-Q100 qualification | Select when >100 mA per channel or >85% efficiency required; avoid for noise-sensitive or automotive-critical use cases |
| TPS92692QPWPRQ1 | Linear current regulator with 150 mA/channel; integrated PWM generator; different pinout; no open-LED disable feature | Supports analog + PWM dimming simultaneously; wider VIN range (4.5–65 V); not pin-compatible with A6261KLYTR-T | Choose for dual-dimming flexibility and higher current needs; verify FF fault reporting compatibility in system design |
Compared with AL8863Q-7 and TPS92692QPWPRQ1, the A6261KLYTR-T offers superior current matching, built-in open-LED safety shutdown, and AEC-Q100 validation - making it optimal for cost-sensitive, thermally constrained, and automotive-grade LED arrays where simplicity and functional safety are prioritized over peak efficiency.
Availability
A6261KLYTR-T is available at Aetrix Electronics and suitable for automotive exterior lighting, commercial signage, industrial control panels, and medical device indicators requiring stable component supply and long-term production continuity.
Supply support for A6261KLYTR-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 sensing and power IC solutions, founded in 1989 and headquartered in Manchester, NH.
The A6261 product line delivers protected, programmable LED current regulation for automotive and industrial lighting, emphasizing functional safety, thermal resilience, and AEC-Q100 compliance in compact surface-mount packages.
FAQ
What is the maximum continuous output current per channel for the A6261KLYTR-T?
The A6261KLYTR-T delivers up to 100 mA per channel (LA1–LA4) under normal operating conditions. Its ILAN0 specification is –95 to –105 mA at IREF = 8 mA, with absolute maximum output current limited to –110 mA. This rating assumes proper thermal management using the exposed pad and appropriate PCB copper area per Allegro's thermal guidelines.
Does the A6261KLYTR-T support PWM dimming, and how is it implemented?
Yes, the A6261KLYTR-T supports PWM dimming via its dedicated EN pin. Applying a logic-high signal enables all outputs; a logic-low disables them. The device features controlled current slew rate (50–110 µs) and fast startup (5–30 µs), enabling clean, low-flicker dimming without overshoot. No external components are needed - direct microcontroller GPIO connection suffices.
How does the A6261KLYTR-T respond to an open LED condition in one string?
When an open LED is detected - indicated by VIN – VLAx exceeding VOCD (170–450 mV) for >2 ms - the A6261KLYTR-T disables all four outputs and asserts the FF pin high. This fail-safe behavior prevents overvoltage stress on remaining LEDs. The fault can be overridden by pulling FF low, re-enabling only the non-faulted channels if desired.
Can the thermal foldback threshold of the A6261KLYTR-T be adjusted, and how?
Yes, the thermal monitor activation temperature (TJM) of the A6261KLYTR-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. Default TJM is 95–130°C with THTH floating. Refer to Figure 3a/b in the A6261A-DS datasheet for resistor selection.
Is the A6261KLYTR-T pin-compatible with other variants like A6261KLJTR-T or A6261KLPTR-T?
No, the A6261KLYTR-T is not pin-compatible with A6261KLJTR-T (8-pin SOICN) or A6261KLPTR-T (16-pin TSSOP). While all share identical functional blocks and pin naming conventions, their physical pin counts, layouts, and terminal assignments differ significantly - especially LA3/LA4 presence (absent in LJ) and PAD location. PCB redesign is required for substitution.
A6261KLYTR-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:
- Linear
- Topology:
- -
- Internal Switch(s):
- Yes
- Number of Outputs:
- 4
- Voltage - Supply (Min):
- 6V
- Voltage - Supply (Max):
- 50V
- Voltage - Output:
- -
- Current - Output / Channel:
- 100mA
- Frequency:
- -
- Dimming:
- PWM
- Applications:
- -
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-MSOP-EP
A6261KLYTR-T FAQ
1.How can I place an order for A6261KLYTR-T through Aetrix?
Please submit a Request for Quotation (RFQ) for A6261KLYTR-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 A6261KLYTR-T reliable?
The price and inventory of A6261KLYTR-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for A6261KLYTR-T is usually 5 days.
3.What payment methods are accepted for A6261KLYTR-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for A6261KLYTR-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for A6261KLYTR-T?
A6261KLYTR-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your A6261KLYTR-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 A6261KLYTR-T?
For technical support, including A6261KLYTR-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your A6261KLYTR-T requirements.
6.How does Aetrix verify that A6261KLYTR-T is sourced from the original manufacturer or authorized distributors?
All A6261KLYTR-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 A6261KLYTR-T meets industry standards.
7.What is the process for return or replacement of A6261KLYTR-T?
All A6261KLYTR-T units undergo pre-shipment inspection (PSI). If there is an issue with A6261KLYTR-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 A6261KLYTR-T part is unused and in its original packaging.
Return procedure for A6261KLYTR-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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