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Allegro MicroSystems A6270KLPTR-T-1
- Part No.:
- A6270KLPTR-T-1
- Manufacturer:
- Allegro MicroSystems
- Category:
- LED Drivers
- Package:
- 16-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
A6270KLPTR-T-1.pdf
- Description:
- IC LED DRVR LINEAR PWM 16ETSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:8,000
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Product details
Overview
A6270KLPTR-T-1 from Allegro MicroSystems is a high-current, two-channel automotive LED controller IC designed to drive external N-channel MOSFETs for Stop/Tail and DRL/Position lighting. It delivers ±4% current regulation accuracy per channel, operates from 5.3 V to 40 V input, supports internal/external PWM dimming (200 Hz–1 kHz), and integrates drain short-to-VIN, open LED, and thermal fault protection. Used in automotive rear lighting modules requiring AEC-Q100 compliance and parallel scalability.
For engineers reviewing the A6270KLPTR-T-1 datasheet, A6270KLPTR-T-1 pinout, A6270KLPTR-T-1 application, or A6270KLPTR-T-1 equivalent, this page provides verified technical context on dual-string current control, VIN- and temperature-based derating behavior, fault response modes (MODE pin configurable), gate driver performance (6–9 V swing), and master-slave synchronization via PWM_OUT/PWM_IN - all critical for automotive lighting BOM validation and thermal layout design.
Technical Context
The A6270KLPTR-T-1 implements independent peak-current regulation per channel using external sense resistors (VREF = 200 mV typ) and programmable derating: reference voltage drops to 90% at VIN ≥ 17.7 V and to 60% at VIN ≥ 19.9 V; thermal derating begins at TJ ≈ 149°C with full shutdown at 170°C. Its dual-gate drivers (GATE1/GATE2) deliver 6–9 V high-level output with <1 V dropout and support CGISS up to 2000 pF.
Fault management is pin-configurable via MODE: when MODE = VBIAS, detected faults (drain short-to-VIN, open LED, drain short-to-GND) latch GATEx high for autorecovery while pulling FF low and disabling GATEy/PWM_OUT; when MODE = LOW, only FF asserts low while GATE1/GATE2 and PWM_OUT remain active. PWM frequency is set either by resistor on PWM_IN (fPWM = 5400/RFPWM + 25 Hz) or external clock, with duty cycle controlled analogically via DR pin (5–90% range).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 5.3 V to 40 V - supports full automotive battery range including cold-crank (5.1 V min enabled) and load-dump transients. |
| Current Regulation Accuracy | ±4% per channel - ensures consistent luminance across LED strings without calibration. |
| Reference Voltage (SENSE1/2) | 200 mV (typ), 192–208 mV (min/max) - sets LED peak current as ILED = 200 mA / RSENSE (Ω). |
| PWM Frequency Range | 200 Hz to 1 kHz - avoids audible noise while enabling fine-grained brightness control. |
| Thermal Shutdown Threshold | 170°C (TJ), with 30°C hysteresis - protects IC and external MOSFETs during sustained overtemperature. |
| VIN Derating Trigger | 17.7 V (VINth(L)) - initiates linear foldback of reference voltage to limit power dissipation in external FETs. |
| Fault Detection Voltages | Drain short-to-VIN: (VIN – VDx) < 0.8 V; Open LED/short-to-GND: VDx < 0.24 V - enables robust string health monitoring. |
Pinout & Package
Package: 16-pin TSSOP (LP) with exposed thermal pad - Pb-free, 100% matte-tin leadframe plating; RθJP = 2°C/W enables efficient heat transfer to PCB ground plane.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (16) | Main power supply input | Accepts 5.3–40 V; powers internal bias and gate drivers; feeds VIN undervoltage/overvoltage detection. |
| GATE1 (13), GATE2 (10) | N-channel MOSFET gate drivers | Deliver 6–9 V swing with <1 V dropout; drive up to 2000 pF gate capacitance; enable high-side LED string control. |
| SENSE1 (12), SENSE2 (11) | Current sense inputs | Monitor voltage drop across external sense resistors; set per-channel LED current with ±4% accuracy. |
| D1 (14), D2 (9) | Drain voltage sensing inputs | Detect drain short-to-VIN (VIN – VDx < 0.8 V), open LED (VDx < 0.24 V), and drain short-to-GND (VDx < 0.24 V). |
| MODE (4) | Fault response mode selector | Configures fault behavior: VBIAS = latched shutdown with autorecovery; LOW = FF-only assertion, normal operation maintained. |
| FULL (15) | Stop mode enable | Overrides PWM_IN/DR; forces 100% duty cycle on both channels for brake light operation. |
| PWM_IN (6), PWM_OUT (5) | Dimming interface | PWM_IN accepts resistor-set or external clock signal; PWM_OUT mirrors internal gate state for master-slave synchronization. |
| FF (7) | Fault flag output | Open-drain logic-low signal indicates active fault; used as fault input in slave configurations when MODE = VBIAS. |
Key Features
| Feature | Design Value |
|---|---|
| Independent dual-channel current regulation | Each channel uses dedicated SENSEx pin and VREF = 200 mV for ±4% matching - eliminates inter-string brightness drift in Stop/Tail systems. |
| Configurable fault response via MODE pin | Two distinct behaviors: MODE = VBIAS enables latched shutdown with autorecovery; MODE = LOW preserves PWM_OUT and gate operation - simplifies system-level fault handling. |
| VIN- and temperature-dependent current derating | Reference voltage folds back linearly above 17.7 V VIN and above ~149°C junction temp - prevents thermal runaway without external compensation circuitry. |
| Master-slave PWM synchronization | PWM_OUT pin replicates internal gate state; connecting to PWM_IN of slave ICs ensures identical dimming frequency/duty cycle across multiple A6270KLPTR-T-1 devices - enables scalable high-channel-count lighting. |
| Integrated protection suite | Detects drain short-to-VIN, open LED, drain short-to-GND, VIN undervoltage, and overtemperature - reduces need for external monitoring components in ASIL-B compliant designs. |
Applications
| Rear Combination Lamp (Stop/Tail) | Daytime Running Light (DRL) |
|---|---|
|
Use Scenario: Dual-function rear lamp where same LED array serves as tail light (low current) and brake light (high current) under ECE R7 or SAE J1373. IC Role / Device Role / Timing Role: A6270KLPTR-T-1 regulates two independent current levels via FULL pin override and DR-controlled PWM duty cycle - enabling seamless transition between 5% (tail) and 100% (stop) output. Use Value: Eliminates need for separate driver ICs or mechanical relays; ±4% current matching ensures uniform color and intensity across dual-mode operation. |
Use Scenario: Automotive front-end DRL module requiring constant-brightness illumination across wide battery voltage range (9–16 V) and ambient temperatures (−40°C to 125°C). IC Role / Device Role / Timing Role: A6270KLPTR-T-1 maintains stable LED current via VIN derating (starts at 17.7 V) and thermal derating (begins at ~149°C) - preventing luminance shift during engine-off battery charge or summer thermal soak. Use Value: Delivers consistent photometric output without microcontroller intervention; AEC-Q100 qualification ensures reliability in safety-critical exterior lighting. |
| Multi-String Adaptive Rear Lighting | Commercial Vehicle Marker Light |
|
Use Scenario: High-channel-count rear lighting system (e.g., 8+ LED strings) requiring synchronized dimming and fault isolation across multiple PCBs. IC Role / Device Role / Timing Role: A6270KLPTR-T-1 operates in master-slave configuration: master's PWM_OUT drives slaves' PWM_IN - ensuring sub-microsecond timing alignment and <2% rise/fall time mismatch between strings. Use Value: Enables pixel-level brightness control for dynamic turn signals or hazard patterns without timing skew or visible strobing. |
Use Scenario: Heavy-duty truck/trailer marker lights exposed to 24 V nominal systems, vibration, and extended temperature cycling. IC Role / Device Role / Timing Role: A6270KLPTR-T-1 withstands 40 V transients and monitors drain faults (VDx < 0.24 V) to detect open/shorted LED strings - maintaining partial functionality during single-string failure. Use Value: Meets FMVSS 108 fault-tolerant requirements; exposed thermal pad (RθJP = 2°C/W) sustains 150°C junction temp in sealed enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-channel automotive LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX20051ATP/V+T | Single-channel, integrated high-side switch (no external MOSFET required); 3.5–65 V input; ±3% current accuracy; no VIN derating. | Suitable for lower-power single-string applications; lacks dual independent regulation and master-slave sync capability. | Select when board space is constrained and external FETs are undesirable; not suitable for Stop/Tail dual-level control or scalable multi-string systems. |
| TLC6C5716RTQR | 16-channel constant-current LED sink driver; 3–5.5 V supply; I²C interface; no built-in fault protection beyond open-load detection. | Targets interior RGB lighting or dashboard backlighting; requires external 24 V DC-DC and MCU coordination. | Select for high-channel-count low-voltage interior lighting; incompatible with direct 12/24 V automotive battery connection or AEC-Q100 rear-lamp requirements. |
Compared with MAX20051ATP/V+T and TLC6C5716RTQR, the A6270KLPTR-T-1 uniquely combines dual independent current regulation, AEC-Q100 qualification, VIN/thermal derating, and hardware-based master-slave synchronization - making it the only option qualified for scalable, fault-resilient Stop/Tail and DRL systems operating directly from automotive battery rails.
Availability
A6270KLPTR-T-1 is available at Aetrix Electronics and suitable for automotive rear lighting modules, commercial vehicle marker systems, and adaptive DRL applications requiring stable component supply, AEC-Q100 compliance, and long-term production continuity.
Supply support for A6270KLPTR-T-1 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 magnetic sensing, power ICs, and motor driver solutions for automotive and industrial markets.
The A6270KLPTR-T-1 belongs to Allegro's automotive LED controller product line, engineered specifically for AEC-Q100-compliant Stop/Tail and DRL lighting systems requiring precise dual-string current regulation, robust fault protection, and scalable multi-IC operation.
FAQ
What is the recommended external MOSFET for use with the A6270KLPTR-T-1?
The A6270KLPTR-T-1 is designed to drive external N-channel MOSFETs such as the BUK7675-55A (as shown in Allegro's Typical Application Circuit A1). Gate drive capability supports up to 2000 pF total gate capacitance, and the 6–9 V gate swing ensures reliable enhancement-mode switching. Always verify RDS(on), SOA, and thermal resistance against your LED string voltage/current and PCB copper area.
How does the A6270KLPTR-T-1 handle simultaneous faults on both LED strings?
When both D1 and D2 report faults (e.g., open LED or drain short-to-VIN), the A6270KLPTR-T-1 responds identically to single-string faults: FF pulls low continuously, and behavior depends on MODE pin state. With MODE = VBIAS, both GATE1 and GATE2 go high for autorecovery attempts; with MODE = LOW, both gates remain active and only FF asserts - preserving partial system functionality per Table 2 in the datasheet.
Can the A6270KLPTR-T-1 operate without an external sense resistor on SENSE1 or SENSE2?
No. The A6270KLPTR-T-1 requires an external sense resistor connected from each SENSEx pin to GND to establish LED current (ILED = 200 mV / RSENSE). Omitting either resistor disables current regulation for that channel and may cause uncontrolled current flow through the associated external MOSFET and LED string.
What is the purpose of the VTHTH pin on the A6270KLPTR-T-1?
The VTHTH pin sets the input undervoltage fault threshold: VINUV = 4 × VTHTH. For example, tying VTHTH to 1.75 V configures VINUV = 7 V with 262 mV hysteresis. This allows system-level customization of startup/brownout behavior without modifying the IC's internal reference, supporting diverse vehicle battery architectures.
Does the A6270KLPTR-T-1 support analog dimming in addition to PWM dimming?
Yes. The A6270KLPTR-T-1 supports analog dimming via the DR pin: applying a DC voltage between 0 V and 3.6 V sets PWM duty cycle from 5% to 90% (equation: PWM(%) = 148 × VDR / VVBIAS). This enables smooth, flicker-free brightness control using a DAC or microcontroller analog output - complementing its resistor- or clock-driven PWM modes.
A6270KLPTR-T-1 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:
- Active
- Type:
- Linear
- Topology:
- -
- Internal Switch(s):
- No
- Number of Outputs:
- 2
- Voltage - Supply (Min):
- 5.3V
- Voltage - Supply (Max):
- 40V
- Voltage - Output:
- -
- Current - Output / Channel:
- -
- Frequency:
- -
- Dimming:
- PWM
- Applications:
- -
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-eTSSOP-EP
A6270KLPTR-T-1 FAQ
1.How can I place an order for A6270KLPTR-T-1 through Aetrix?
Please submit a Request for Quotation (RFQ) for A6270KLPTR-T-1 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 A6270KLPTR-T-1 reliable?
The price and inventory of A6270KLPTR-T-1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for A6270KLPTR-T-1 is usually 5 days.
3.What payment methods are accepted for A6270KLPTR-T-1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for A6270KLPTR-T-1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for A6270KLPTR-T-1?
A6270KLPTR-T-1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your A6270KLPTR-T-1 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 A6270KLPTR-T-1?
For technical support, including A6270KLPTR-T-1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your A6270KLPTR-T-1 requirements.
6.How does Aetrix verify that A6270KLPTR-T-1 is sourced from the original manufacturer or authorized distributors?
All A6270KLPTR-T-1 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 A6270KLPTR-T-1 meets industry standards.
7.What is the process for return or replacement of A6270KLPTR-T-1?
All A6270KLPTR-T-1 units undergo pre-shipment inspection (PSI). If there is an issue with A6270KLPTR-T-1, 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 A6270KLPTR-T-1 part is unused and in its original packaging.
Return procedure for A6270KLPTR-T-1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
A6270KLPTR-T-1 Tags
-
BCR402RE6327HTSA1
Infineon Technologies
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BCR430UXTSA2
Infineon Technologies
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BCR420UE6433HTMA1
Infineon Technologies
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BCR420UE6327HTSA1
Infineon Technologies
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BCR421UE6327HTSA1
Infineon Technologies
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LYT1604D-TL
Power Integrations
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HV9910CLG-G
Microchip Technology
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CL2N8-G
Microchip Technology
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BCR420UW6-7
Diodes Incorporated
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BCR421UW6-7
Diodes Incorporated
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BCR420UFD-7
Diodes Incorporated
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BCR421UFD-7
Diodes Incorporated
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