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Allegro MicroSystems A6266KLPTR-T
- Part No.:
- A6266KLPTR-T
- Manufacturer:
- Allegro MicroSystems
- Category:
- LED Drivers
- Package:
- 16-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
A6266KLPTR-T.pdf
- Description:
- IC LED DRVR CTRL PWM 1A 16ETSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,575
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Product details
Overview
A6266KLPTR-T from Allegro MicroSystems is an AEC-Q100 Grade 0 automotive-qualified boost converter controller for constant-current high-power LED string driving. It delivers up to 1 A output current, supports up to 15 series-connected LEDs (e.g., 3.5 Vf each), and operates from 5–50 V input supply-optimized for 12 V/24 V automotive systems including fog lights, DRLs, and reversing lights.
For engineers reviewing the A6266KLPTR-T datasheet, A6266KLPTR-T pinout, A6266KLPTR-T application, or A6266KLPTR-T equivalent, key selection considerations include its programmable 100–700 kHz switching frequency, dual fault flags (FF1/FF2) with open/short LED detection, thermal shutdown at 170°C, and PWM dimming via EN pin with 94 ms disable time.
Technical Context
The A6266KLPTR-T implements a fixed-frequency, current-mode control architecture with dual-loop regulation: an inner loop controls peak switch current using SP/SN sense inputs and slope compensation, while the outer loop regulates average LED current via LP/LN differential sensing and IREF-modulated reference. Diagnostics include latched open-LED protection (VOCL = 5.5 V), shorted-LED detection using LA/LF voltage ratio comparison, and VREG undervoltage lockout (3.8 V turn-off).
It integrates gate drive (SG) capable of 35 ns rise/fall times into logic-level MOSFETs, supports interleaving via CKOUT phase-shifted oscillator output, and features two open-drain fault flags (FF1/FF2) with distinct latching behavior per fault type-FF1 asserts on output short or shorted LED string, FF2 on undercurrent or overtemperature-enabling differentiated system-level response.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 5–50 V - supports full automotive battery range including cold-crank (6 V) and load-dump (50 V) transients. |
| Max LED Current | 1 A - set by external RSL; enables high-brightness illumination for headlights and fog lamps. |
| Switching Frequency | 100–700 kHz - adjustable via ROSC resistor or external clock; enables EMI optimization and inductor size reduction. |
| LED String Capacity | Up to 15 LEDs - validated at 3.5 Vf per LED with 85% duty cycle; ensures uniform brightness in series configuration. |
| Thermal Protection | 170°C warning threshold with 15°C hysteresis - triggers FF2 flag without disabling output, allowing external thermal management. |
| Fault Detection | Open LED (VOCL = 5.5 V), shorted LED (VSCOR = 505 mV), short-to-supply/ground - enables fail-safe lighting system diagnostics. |
| Package Thermal Resistance | RθJA = 34°C/W (4-layer PCB) - requires exposed pad soldering for automotive-grade thermal reliability. |
Pinout & Package
The A6266KLPTR-T is housed in a 16-pin TSSOP package with exposed thermal pad (suffix LP), Pb-free with 100% matte tin leadframe plating, optimized for automotive thermal and mechanical robustness.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN | Enable / PWM input | Direct PWM dimming interface; low >94 ms initiates sleep mode (<4 µA quiescent). |
| FF1, FF2 | Fault flag outputs | Open-drain indicators: FF1 latches on output short/shorted string; FF2 reports undercurrent/overtemperature. |
| LP, LN | LED current sense inputs | Differential measurement across RSL; sets 100% current as VIDL/RSL (typ. 100 mV). |
| LA, LF | LED string voltage reference | LA senses total string voltage via resistor divider; LF references first LED forward voltage for short detection. |
| SG | Gate driver output | Drives external low-side MOSFET; 35 ns switching with 1.7 Ω pull-up (25°C) for efficient boost stage control. |
| VIN, GND, VREG | Power and regulation | VIN: main 5–50 V supply; VREG: internal 5 V regulator (4.75–5.25 V) with capacitor bypass on pin 11. |
| OSC, CKOUT | Oscillator interface | OSC sets frequency (100–700 kHz) via resistor or external clock; CKOUT provides phase-shifted sync signal for multi-controller interleaving. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 0 qualification | Rated for −40°C to +150°C ambient operation - meets automotive junction temperature and reliability requirements. |
| Single and multiple LED short detection | Uses LA/LF voltage ratio comparison to identify shorted LEDs without disabling output - maintains partial illumination safety. |
| Programmable LED current reference | IREF pin accepts 0–1 V analog input to scale LED current linearly - enables intensity matching across modules or soft-start sequencing. |
| Open LED overvoltage protection | Disables SG output when VLA−VLP > 5.5 V - prevents hazardous voltages during LED string breakage. |
| Interleaved switching support | CKOUT provides phase-shifted oscillator output - reduces input ripple and simplifies EMC filter design in multi-channel systems. |
Applications
| Automotive Fog Lights | Daytime Running Lights (DRL) |
|---|---|
Use Scenario: High-intensity forward lighting in low-visibility conditions requiring robust thermal and fault resilience. IC Role / Device Role / Timing Role: Boost controller regulating constant 700–1000 mA through 8–12 series white LEDs; manages load-dump transients up to 50 V. Use Value: Maintains uniform brightness despite battery voltage variation; detects single LED shorts to prevent complete channel failure. | Use Scenario: Always-on front lighting meeting EU ECE R87 photometric requirements with minimal power draw. IC Role / Device Role / Timing Role: Constant-current driver for 6–10 series LEDs; uses EN pin for PWM dimming at 100–1000 Hz to meet luminance modulation specs. Use Value: Delivers precise 100–300 mA output with <±5% current error; leverages FF2 flag for thermal derating feedback to MCU. |
| Reversing Lights | Automotive Headlights (Low Beam) |
Use Scenario: High-reliability rear illumination activated during gear shift, subject to vibration and thermal cycling. IC Role / Device Role / Timing Role: LED string controller with open-circuit detection (VOCL = 5.5 V) and latch-reset via EN toggle; operates from 12 V nominal supply. Use Value: Prevents unsafe high-voltage stress on output capacitor during LED failure; enables diagnostic logging via FF1/FF2 status. | Use Scenario: Primary forward lighting with adaptive beam shaping, requiring stable current under engine cranking (6 V min). IC Role / Device Role / Timing Role: Boost-mode controller driving 15-series LEDs at 1 A; uses VIN range (5–50 V) to sustain operation during cold-crank events. Use Value: Ensures uninterrupted illumination down to 6 V input; integrated diagnostics support ASIL-B functional safety monitoring. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar boost-mode LED controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| A6271KLPTR-T-1 | Successor device with enhanced ESD rating (±8 kV HBM), improved VREG UVLO hysteresis (120 mV), and updated fault blank timer. | Designed for new designs requiring extended lifecycle support; discontinued A6266KLPTR-T is not recommended for new applications. | Select A6271KLPTR-T-1 for production ramp; A6266KLPTR-T remains viable only for legacy repair or obsolescence mitigation. |
| LM3410XMYX/NOPB | Non-automotive boost LED driver with 1.6 MHz fixed frequency, no integrated LED short/open diagnostics, and −40°C to +125°C rating. | Suitable for industrial/commercial lighting where AEC-Q100 compliance and multi-LED fault isolation are not required. | Choose LM3410XMYX/NOPB only if automotive qualification, thermal grade, and advanced diagnostics are unnecessary. |
Compared with A6266KLPTR-T, the A6271KLPTR-T-1 offers extended manufacturer support and refined protection features, while the LM3410XMYX/NOPB provides higher switching frequency but lacks automotive qualification and comprehensive LED fault detection-making it unsuitable for safety-critical vehicle lighting.
Availability
A6266KLPTR-T is available at Aetrix Electronics and suitable for automotive fog lights, daytime running lights, and reversing lights requiring stable component supply despite end-of-life status.
Supply support for A6266KLPTR-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 magnetic sensors and power ICs, specializing in automotive and industrial motion control solutions.
The A6266 product line delivers automotive-grade LED lighting controllers with integrated diagnostics, targeting headlight, DRL, and auxiliary lighting systems requiring AEC-Q100 Grade 0 reliability and functional safety awareness.
FAQ
Is A6266KLPTR-T still recommended for new designs?
No. Allegro MicroSystems explicitly states that A6266KLPTR-T is discontinued and should not be purchased for new design applications. The recommended substitution is A6271KLPTR-T-1, which offers updated specifications and ongoing production support. A6266KLPTR-T remains available only for legacy repair or obsolescence bridging, with no samples offered.
What is the maximum number of LEDs the A6266KLPTR-T can drive, and under what conditions?
The A6266KLPTR-T is validated to drive up to 15 series-connected LEDs at currents up to 1 A, assuming each LED has a forward voltage of 3.5 V and the boost converter operates at 85% duty cycle. This configuration requires minimum input voltage of 9 V (per datasheet VIN vs. LED count table) and is optimized for 12 V/24 V automotive systems.
How does the A6266KLPTR-T detect a shorted LED in the string?
The A6266KLPTR-T detects shorted LEDs by comparing two differential voltages: VSTR = VLA − VLP (total string voltage scaled by resistor divider) and VLED = VLF − VLP (reference LED voltage). For the first LED, a short is flagged if VSTR > VLED + VSCOR (505 mV typ); for others, if VLED > VSTR + VSCO (200 mV typ). FF2 goes high-impedance while output remains active.
Can the A6266KLPTR-T perform analog dimming, and how is it implemented?
Yes. Analog dimming is implemented via the IREF pin: applying 0–1 V to IREF scales the LED current linearly per equation ILED(max) = VIREF/(10 × RSL). This enables intensity matching between LED modules or soft-start functionality using an RC network from IREF to VREG and GND. Full-scale current (100%) occurs when IREF = VREG (5 V).
What thermal management is required for reliable operation of the A6266KLPTR-T?
Reliable operation requires soldering the exposed thermal pad to a minimum 3.8 in² copper area per side on a 2-layer PCB (RθJA = 43°C/W) or use of a 4-layer JEDEC-standard board (RθJA = 34°C/W). Junction temperature must remain ≤150°C; overtemperature warning triggers at 170°C (FF2 flag), with 15°C hysteresis. Derating is necessary above 100°C ambient.
A6266KLPTR-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Allegro MicroSystems
- Series:
- -
- Package/Case:
- 16-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- DC DC Controller
- Topology:
- Step-Up (Boost)
- Internal Switch(s):
- No
- Number of Outputs:
- 1
- Voltage - Supply (Min):
- 5V
- Voltage - Supply (Max):
- 50V
- Voltage - Output:
- -
- Current - Output / Channel:
- 1A
- Frequency:
- 100kHz ~ 700kHz
- Dimming:
- PWM
- Applications:
- -
- Operating Temperature:
- -40°C ~ 150°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-eTSSOP-EP
A6266KLPTR-T FAQ
1.How can I place an order for A6266KLPTR-T through Aetrix?
Please submit a Request for Quotation (RFQ) for A6266KLPTR-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 A6266KLPTR-T reliable?
The price and inventory of A6266KLPTR-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for A6266KLPTR-T is usually 5 days.
3.What payment methods are accepted for A6266KLPTR-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for A6266KLPTR-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for A6266KLPTR-T?
A6266KLPTR-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your A6266KLPTR-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 A6266KLPTR-T?
For technical support, including A6266KLPTR-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your A6266KLPTR-T requirements.
6.How does Aetrix verify that A6266KLPTR-T is sourced from the original manufacturer or authorized distributors?
All A6266KLPTR-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 A6266KLPTR-T meets industry standards.
7.What is the process for return or replacement of A6266KLPTR-T?
All A6266KLPTR-T units undergo pre-shipment inspection (PSI). If there is an issue with A6266KLPTR-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 A6266KLPTR-T part is unused and in its original packaging.
Return procedure for A6266KLPTR-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
A6266KLPTR-T Tags
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