My Inquiry
My Account
Allegro MicroSystems A6265KLPTR-T
- Part No.:
- A6265KLPTR-T
- Manufacturer:
- Allegro MicroSystems
- Category:
- LED Drivers
- Package:
- 16-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
A6265KLPTR-T.pdf
- Description:
- IC LED DRIVER CTRLR PWM 16ETSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,994
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
A6265KLPTR-T from Allegro MicroSystems is an automotive-grade DC-DC LED controller IC designed to drive 2–10 high-power LEDs in series with programmable constant current up to 1 A. It supports both ground-referenced boost and supply-referenced buck-boost topologies, features dual fault flags (FF1/FF2), integrated LED short/open diagnostics, and operates from 6.5 V to 50 V input - optimized for fog lights, DRLs, and reversing lights.
For engineers reviewing the A6265KLPTR-T datasheet, A6265KLPTR-T pinout, A6265KLPTR-T application, or A6265KLPTR-T equivalent, key selection considerations include its AEC-Q100 Grade 0 qualification, 100–700 kHz programmable switching frequency, 16-pin TSSOP-LP package with exposed thermal pad, and support for PWM dimming via EN pin with <94 ms disable time.
Technical Context
The A6265KLPTR-T implements a constant-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. Its buck-boost topology ensures no LED leakage path during shutdown and eliminates inrush at power-up.
It integrates diagnostic comparators for LED open-circuit (VOCL = 5.5 V), single/multiple LED shorts (VSCL = 505 mV, VSCOR = 505 mV), undercurrent (VUCL = 1 mV), overtemperature (TJF = 170 °C), and VREG undervoltage (VREGUV = 4.3 V), with latched or non-latched fault reporting on FF1 and FF2 open-drain outputs.
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 Range | Programmable up to 1 A via external RSL - enables uniform brightness across 2–10 series LEDs |
| Switching Frequency | 100 kHz to 700 kHz - adjustable via ROSC resistor or external clock on OSC pin for EMI optimization |
| Operating Temperature | –40 °C to +150 °C (Grade 0) - qualified per AEC-Q100 for under-hood automotive placement |
| Fault Detection | Dual open-drain flags FF1/FF2 - FF1 latches on output short/shorted string; FF2 reports undercurrent/overtemp without latch |
| Shutdown Current | ≤10 μA - includes LED leakage path; enables always-on connection in vehicle systems |
| Package Thermal Resistance | RθJA = 34 °C/W (4-layer PCB) - exposed thermal pad enables high-power LED driver thermal management |
Pinout & Package
Package: 16-pin TSSOP with exposed thermal pad (suffix LP); lead-free, 100% matte tin plating; JEDEC-standard footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN | Enable / PWM input | Active-high logic input; enables operation or accepts external PWM for brightness control; >94 ms low disables chip into sleep mode |
| FF1, FF2 | Fault flag outputs | Open-drain outputs; FF1 latches critical faults (output short, shorted string); FF2 reports transient faults (undercurrent, overtemp) |
| LP, LN | LED current sense inputs | Differential pair measuring voltage across RSL; sets LED current via VIDL = 100 mV (typical) and IREF scaling |
| LA, LF | LED string voltage monitoring | LA senses total LED string voltage via resistor divider; LF references first LED forward voltage - enables detection of 1+ shorted LEDs |
| SG | Gate driver output | Drives external logic-level N-channel MOSFET low-side switch; 35 ns rise/fall time, 1.7 Ω pull-up (25°C) |
| SP, SN | Switch current sense inputs | Monitors peak inductor current via RSS; supports slope-compensated current-mode control with 410 mV (typ) VIDS limit |
| VIN, GND, VREG | Power rails | VIN powers control circuitry (6.5–50 V); GND is system ground; VREG provides internal 5 V ±5% regulated supply for bias and capacitor decoupling |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 0 qualification | Validated for –40 °C to +150 °C junction operation - suitable for direct mounting near headlights or fog lamps |
| Buck-boost topology support | Enables seamless operation across wide input (6.5–50 V) without LED current interruption - critical for 12 V/24 V dual-voltage vehicles |
| Single/multiple LED short detection | Uses LA/LF differential comparison to identify shorted diodes within string - prevents thermal runaway in multi-LED arrays |
| PWM dimming via EN pin | Accepts external PWM signal directly on EN; switches LED current between 100% and ~8% - preserves LED color fidelity in amber/white applications |
| Integrated diagnostics with dual fault flags | FF1/FF2 provide independent, configurable fault signaling - simplifies CAN/FlexRay communication interface design for ASAM-compliant lighting modules |
| Thermal pad-enhanced TSSOP package | Exposed pad reduces RθJP to 2 °C/W - enables >1 W dissipation in compact headlight ECU layouts without heatsink |
Applications
| Automotive Fog Lights | Daytime Running Lights (DRL) |
|---|---|
Use Scenario: High-intensity white LED array mounted in front bumper, operating continuously in daylight with ambient temperature up to 85 °C. IC Role / Device Role / Timing Role: Constant-current controller regulating 8-series LEDs at 700 mA; manages buck-boost conversion from 12 V nominal to ~28 V string voltage. Use Value: Eliminates brightness variation across temperature; built-in open-LED protection prevents overvoltage stress on remaining LEDs during filament failure. |
Use Scenario: Slim-profile LED bar integrated into headlamp housing, requiring precise intensity matching and EMI-constrained layout. IC Role / Device Role / Timing Role: PWM-dimming controller using EN pin; synchronizes switching via CKOUT to adjacent A6265KLPTR-T units for interleaved operation. Use Value: Reduces conducted EMI by spreading input current harmonics; analog dimming via IREF enables factory calibration of luminance uniformity. |
| Reversing Lights | Automotive Headlights |
Use Scenario: Rear-mounted LED cluster activated only during reverse gear, subject to vibration and moisture exposure. IC Role / Device Role / Timing Role: Fault-tolerant LED driver with latched FF1 reporting short-to-ground on LED harness - triggers dashboard warning before failure propagation. Use Value: Detects chafed wiring or connector corrosion early; shutdown current <10 μA avoids battery drain during long parking periods. |
Use Scenario: Adaptive driving beam (ADB) module with multiple independently controlled LED segments, each driven by dedicated A6265KLPTR-T. IC Role / Device Role / Timing Role: Primary current regulator for high-brightness segment; uses LA/LF sensing to validate individual LED health in real time. Use Value: Enables functional safety compliance (ISO 26262 ASIL-B) via hardware-based LED short/open diagnostics - no software polling required. |
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), updated fault blank timer, and improved VREG UVLO hysteresis (150 mV vs. 160 mV) | Same pinout and function; supports identical LED counts/currents but adds robustness for next-gen automotive platforms | Select for new designs requiring extended lifecycle support and higher reliability margin |
| LM3409QMHX/NOPB | Non-AEC-Q100 boost-only controller; lacks buck-boost mode, LA/LF short-detection, and dual fault flags; 1.25 MHz max fSW | Suitable for non-automotive industrial LED drivers where cost is prioritized over diagnostics and topology flexibility | Use only in non-automotive contexts; not drop-in compatible due to missing diagnostic pins and different pin mapping |
Compared with A6265KLPTR-T, the A6271KLPTR-T-1 offers direct replacement capability with enhanced robustness for future production, while LM3409QMHX/NOPB serves cost-sensitive non-automotive applications but requires board redesign and loses critical automotive safety features.
Availability
A6265KLPTR-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 - supported via legacy inventory and cross-qualified alternatives.
Supply support for A6265KLPTR-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 sensing and power ICs, specializing in automotive-grade motion control and energy-efficient power management solutions.
The A6265 product line delivers high-current LED driver controllers for automotive exterior lighting, engineered to meet stringent AEC-Q100 Grade 0 requirements and support functional safety architectures in headlight and signal lamp modules.
FAQ
Is A6265KLPTR-T still recommended for new designs?
No - the A6265KLPTR-T is discontinued and should not be purchased for new design applications. Allegro recommends transitioning to the A6271KLPTR-T-1, which maintains pin compatibility and adds enhanced ESD protection and updated fault timing. A6265KLPTR-T remains available through Aetrix Electronics for legacy production and repair, backed by documented traceable sourcing and lifecycle coordination.
What is the maximum number of LEDs the A6265KLPTR-T can drive in buck-boost mode?
The A6265KLPTR-T supports up to 10 LEDs in series in buck-boost mode when VBAT(min) = 9 V and each LED has Vf = 3.5 V, assuming D(max) = 85%. This is confirmed in the "Buck Boost Mode" table on page 2 of the A6265-DS Rev. 9 datasheet. The controller dynamically adjusts duty cycle to maintain constant current across the full input voltage range.
How does the A6265KLPTR-T detect a single shorted LED in a string?
The A6265KLPTR-T detects a single shorted LED by comparing the voltage at LA (scaled total string voltage) against the voltage at LF (reference LED forward voltage). When one LED shorts, VLA drops proportionally while VLF remains stable - triggering a fault condition flagged on FF2. This capability is explicitly stated in the "Features and Benefits" section and validated in the Functional Description on page 7 of the datasheet.
Can the A6265KLPTR-T operate with a 24 V nominal supply?
Yes - the A6265KLPTR-T supports input voltages from 6.5 V to 50 V, fully covering 24 V nominal automotive systems including transients up to ISO 7637-2 Pulse 5a (58 V). Its buck-boost topology ensures stable LED current regulation even during cranking (down to 6.5 V) and load dump events, as verified in the Absolute Maximum Ratings and Functional Description sections.
What is the purpose of the CKOUT pin on the A6265KLPTR-T?
The CKOUT pin on the A6265KLPTR-T provides a phase-shifted oscillator output synchronized to the internal clock. It is used to interleave switching of multiple A6265KLPTR-T devices - reducing input ripple current and simplifying EMC filter design. This functionality is documented in the Pin Functions section (page 7) and illustrated in the Functional Block Diagrams (page 4) of the official datasheet.
A6265KLPTR-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:
- -
- Frequency:
- -
- 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
A6265KLPTR-T FAQ
1.How can I place an order for A6265KLPTR-T through Aetrix?
Please submit a Request for Quotation (RFQ) for A6265KLPTR-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 A6265KLPTR-T reliable?
The price and inventory of A6265KLPTR-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for A6265KLPTR-T is usually 5 days.
3.What payment methods are accepted for A6265KLPTR-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for A6265KLPTR-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for A6265KLPTR-T?
A6265KLPTR-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your A6265KLPTR-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 A6265KLPTR-T?
For technical support, including A6265KLPTR-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your A6265KLPTR-T requirements.
6.How does Aetrix verify that A6265KLPTR-T is sourced from the original manufacturer or authorized distributors?
All A6265KLPTR-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 A6265KLPTR-T meets industry standards.
7.What is the process for return or replacement of A6265KLPTR-T?
All A6265KLPTR-T units undergo pre-shipment inspection (PSI). If there is an issue with A6265KLPTR-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 A6265KLPTR-T part is unused and in its original packaging.
Return procedure for A6265KLPTR-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
A6265KLPTR-T Tags
-
BCR402RE6327HTSA1
Infineon Technologies
-
BCR430UXTSA2
Infineon Technologies
-
BCR420UE6433HTMA1
Infineon Technologies
-
BCR420UE6327HTSA1
Infineon Technologies
-
BCR421UE6327HTSA1
Infineon Technologies
-
LYT1604D-TL
Power Integrations
-
HV9910CLG-G
Microchip Technology
-
CL2N8-G
Microchip Technology
-
BCR420UW6-7
Diodes Incorporated
-
BCR421UW6-7
Diodes Incorporated
-
BCR420UFD-7
Diodes Incorporated
-
BCR421UFD-7
Diodes Incorporated
Tech Hub
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
