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Allegro MicroSystems A6267KLPTR-T
- Part No.:
- A6267KLPTR-T
- Manufacturer:
- Allegro MicroSystems
- Category:
- LED Drivers
- Package:
- 16-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
A6267KLPTR-T.pdf
- Description:
- IC LED DRVR CTRL PWM 1A 16ETSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,891
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Product details
Overview
A6267KLPTR-T from Allegro MicroSystems is an AEC-Q100 Grade 0 automotive LED controller IC that implements a programmable constant-current DC-DC converter for driving up to 15 high-power LEDs in series at currents up to 1 A. It supports both ground-referenced boost and supply-referenced buck-boost topologies, delivers integrated open/short LED diagnostics with dual fault flags (FF1/FF2), and operates from 6.5 V to 50 V input - optimized for fog lights, DRLs, and reversing lights.
For engineers reviewing the A6267KLPTR-T datasheet, A6267KLPTR-T pinout, A6267KLPTR-T application, or A6267KLPTR-T equivalent, key selection considerations include its 16-pin TSSOP-LP package with exposed thermal pad, programmable 100–700 kHz switching frequency, 10 μA shutdown current, LED undercurrent detection, and single/multiple shorted-LED identification capability.
Technical Context
The A6267KLPTR-T uses current-mode control with dual-loop regulation: an inner loop manages peak switch current via SP/SN sense inputs and slope-compensated PWM, while the outer loop regulates average LED current using LP/LN differential sensing and IREF-modulated reference. Its buck-boost topology ensures no LED leakage path during shutdown and eliminates inrush current at power-up.
It integrates diagnostic comparators for VREG undervoltage (4.1–4.5 V trip), overtemperature warning (170 °C), open LED (>5.5 V), shorted LED string (505 mV threshold), and LED undercurrent (1 mV hysteresis). Fault status is latched on open LED, output short, or shorted LED string, and cleared only by EN low pulse or power cycle.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 6.5 V to 50 V - supports full automotive battery range including cold-crank and load-dump transients. |
| LED Current Accuracy | ±5% error - ensured by precision 100 mV LED sense threshold (VIDL) and matched amplifier architecture. |
| Switching Frequency | 100–700 kHz - set externally via ROSC resistor or driven synchronously via OSC/CKOUT for EMI reduction. |
| Thermal Resistance | RθJA = 34 °C/W (4-layer PCB) - enables >1 A continuous LED drive with standard thermal layout. |
| Fault Detection | Dual open-drain FF1/FF2 outputs - FF1 asserts on VREG UV, output short, open LED, or shorted LED string; FF2 on LED undercurrent or overtemperature. |
| Shutdown Current | 10 μA - includes LED leakage, enabling always-on vehicle systems without battery drain. |
| Operating Temperature | –40 °C to +150 °C (Grade 0) - qualified per AEC-Q100 for under-hood automotive placement. |
Pinout & Package
Package: 16-pin TSSOP with exposed thermal pad (LP suffix), lead-free, 100% matte tin plating. Thermal pad must be soldered to PCB ground plane for RθJP = 2 °C/W performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN | Enable / PWM dimming input | Direct logic-level PWM interface; low >94 ms disables gate drive and enters 10 μA sleep mode. |
| FF1, FF2 | Fault flag outputs | Open-drain signals - FF1 latches critical faults (open LED, short string); FF2 reports transient faults (undercurrent, overtemp). |
| LP, LN | LED current sense inputs | Differential pair measuring voltage across external RSL; sets 100 mV threshold for ±5% current accuracy. |
| LA, LF | LED string voltage reference inputs | LA senses scaled total LED string voltage; LF references first LED forward voltage - enables single/multiple short detection. |
| SG | Gate driver output | Logic-level MOSFET driver (35 ns rise/fall); drives external low-side N-channel FET in boost/buck-boost configurations. |
| SP, SN | Switch current sense inputs | Monitors peak inductor current via RSS; slope-compensated to prevent subharmonic oscillation at D >50%. |
| VIN, GND, VREG | Power and regulation | VIN powers control circuitry (6.5–50 V); VREG provides internal 5 V rail (4.75–5.25 V) for bias and capacitor stabilization. |
Key Features
| Feature | Design Value |
|---|---|
| Buck-boost topology support | Enables seamless operation across wide input (6.5–50 V) without LED leakage path or inrush current at startup. |
| Single/multiple shorted-LED detection | Uses LA/LF differential comparison to identify failure of one or more LEDs in series string - not just open/short string. |
| Programmable switching frequency | 100–700 kHz via ROSC resistor or external clock - allows EMI optimization and multi-controller interleaving via CKOUT. |
| Integrated diagnostics with latching | FF1 latches on hazardous faults (open LED, short string); FF2 reports recoverable conditions (undercurrent, overtemp) without disabling drive. |
| Analog dimming via IREF | 0–1 V input reduces LED current linearly (ILED = VIREF/(10 × RSL)), enabling intensity-matching and soft-start without PWM color shift. |
Applications
| Automotive Fog Lights | Daytime Running Lights (DRL) |
|---|---|
|
Use Scenario: High-intensity white LED arrays mounted in front bumper, operating continuously in daylight with ambient temperature up to 125 °C. IC Role / Device Role / Timing Role: Constant-current controller regulating 12-series LEDs at 700 mA in buck-boost mode to maintain brightness across 9–16 V battery variation. Use Value: Eliminates brightness drift during engine cranking; integrated open-LED protection prevents overvoltage damage when single LED fails open. |
Use Scenario: Linear LED bar on vehicle fascia, requiring uniform luminance and fail-safe behavior per ISO 8820-3. IC Role / Device Role / Timing Role: Primary LED driver with PWM dimming via EN pin at 200 Hz, synchronized across multiple A6267KLPTR-T units using CKOUT. Use Value: Ensures flicker-free operation and consistent color point; dual fault flags enable CAN bus reporting of partial LED failures. |
| Reversing Lights | Automotive Headlights (Low Beam) |
|
Use Scenario: Rear-mounted LED clusters activated only during reverse gear, subject to vibration and condensation. IC Role / Device Role / Timing Role: Boost-mode controller driving 8-series amber LEDs at 1 A, with thermal derating enabled above 130 °C junction. Use Value: 150 °C max junction rating and robust short-to-ground protection prevent field failures from moisture-induced shorts. |
Use Scenario: Adaptive front-lighting system (AFS) module requiring precise current matching between left/right headlight arrays. IC Role / Device Role / Timing Role: Dual A6267KLPTR-T controllers with matched ROSC and IREF biasing to achieve <1% inter-channel current mismatch. Use Value: Analog dimming via IREF enables dynamic beam shaping without color shift; LA/LF diagnostics confirm individual LED integrity before activation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| A6271KLPTR-T-1 | Successor device with enhanced ESD rating (±8 kV HBM), lower quiescent current (3 μA), and extended VIN range (4.5–60 V). | Supports next-gen 48 V mild-hybrid architectures and wider cold-crank margins; retains pin compatibility but requires updated ROSC/IREF calibration. | Select A6271KLPTR-T-1 for new designs requiring longer product lifecycle, higher reliability, or 48 V compatibility. |
| LM3409QMY/NOPB | TI automotive LED controller with similar boost/buck-boost capability but no integrated shorted-LED detection or LA/LF diagnostic pins. | Lacks single/multiple LED short identification; relies on external comparators for open/short string detection - increases BOM count and layout complexity. | Choose LM3409QMY/NOPB only if legacy design reuse or TI ecosystem alignment outweighs diagnostic capability loss. |
Compared with A6267KLPTR-T, the A6271KLPTR-T-1 offers extended voltage range and lower shutdown current for future-proofing, while the LM3409QMY/NOPB provides functional equivalence without advanced LED-level diagnostics - making A6267KLPTR-T uniquely suited for safety-critical lighting where per-LED fault isolation is mandatory.
Availability
A6267KLPTR-T is available at Aetrix Electronics and suitable for automotive fog lights, daytime running lights, and reversing lights requiring stable component supply despite its discontinued status - inventory is held for legacy design support and repair programs.
Supply support for A6267KLPTR-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-grade motion control and energy-efficient power management solutions.
The A6267 product line was developed specifically for AEC-Q100-compliant high-current LED lighting in harsh automotive environments, emphasizing diagnostic integrity, thermal resilience, and topology flexibility across 12 V and 24 V platforms.
FAQ
Is A6267KLPTR-T still recommended for new designs?
No - A6267KLPTR-T is a discontinued product and should not be purchased for new design applications. Allegro recommends transitioning to the A6271KLPTR-T-1, which offers improved specifications and ongoing production support. A6267KLPTR-T remains available through Aetrix Electronics solely for legacy repair, replacement, and end-of-life program fulfillment.
What is the maximum number of LEDs the A6267KLPTR-T can drive in buck-boost mode?
The A6267KLPTR-T can drive up to 13 LEDs in series in buck-boost mode when VBAT(min) = 9 V and each LED has a forward voltage of 3.5 V, assuming 85% maximum duty cycle. This is confirmed in the "Buck Boost Mode" table on page 2 of the A6267-DS Rev. 7 datasheet.
How does the A6267KLPTR-T detect a single shorted LED versus a fully shorted LED string?
The A6267KLPTR-T uses LA and LF pins to compare total string voltage (VSTR = VLA – VLP) against reference LED voltage (VLED = VLF – VLP). A single shorted LED reduces VSTR proportionally while preserving VLED; a fully shorted string collapses VSTR near zero while VLED remains measurable - enabling distinct fault flag responses per Table 1.
Can the A6267KLPTR-T operate without the VREG capacitor?
No - the VREG pin requires an external capacitor (typically 1–10 μF ceramic) connected to GND to stabilize the internal 5 V regulator. Omitting this capacitor causes VREG ripple, leading to erratic gate drive timing, oscillator instability, and potential fault flag misassertion - as specified in the Pin Functions section of the A6267-DS Rev. 7.
What is the disable time (tDIS) of the A6267KLPTR-T and how is it determined?
The disable time tDIS of the A6267KLPTR-T is 94 ms when fOSC = 350 kHz. It is derived from the oscillator period multiplied by a fixed ratio of 32,768 - meaning tDIS scales inversely with oscillator frequency (e.g., at 175 kHz, tDIS ≈ 188 ms). This value is measured from EN low assertion to full shutdown entry.
A6267KLPTR-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-Down (Buck), Step-Up (Boost)
- Internal Switch(s):
- No
- Number of Outputs:
- 1
- Voltage - Supply (Min):
- 6.5V
- 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
A6267KLPTR-T FAQ
1.How can I place an order for A6267KLPTR-T through Aetrix?
Please submit a Request for Quotation (RFQ) for A6267KLPTR-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 A6267KLPTR-T reliable?
The price and inventory of A6267KLPTR-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for A6267KLPTR-T is usually 5 days.
3.What payment methods are accepted for A6267KLPTR-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for A6267KLPTR-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for A6267KLPTR-T?
A6267KLPTR-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your A6267KLPTR-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 A6267KLPTR-T?
For technical support, including A6267KLPTR-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your A6267KLPTR-T requirements.
6.How does Aetrix verify that A6267KLPTR-T is sourced from the original manufacturer or authorized distributors?
All A6267KLPTR-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 A6267KLPTR-T meets industry standards.
7.What is the process for return or replacement of A6267KLPTR-T?
All A6267KLPTR-T units undergo pre-shipment inspection (PSI). If there is an issue with A6267KLPTR-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 A6267KLPTR-T part is unused and in its original packaging.
Return procedure for A6267KLPTR-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
A6267KLPTR-T Tags
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