My Inquiry
My Account
Allegro MicroSystems A6284KLPTR-T-1
- Part No.:
- A6284KLPTR-T-1
- Manufacturer:
- Allegro MicroSystems
- Category:
- LED Drivers
- Package:
- 20-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
A6284KLPTR-T-1.pdf
- Description:
- IC LED DRV LIN PWM 120MA 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,640
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
A6284KLPTR-T-1 from Allegro MicroSystems is a latching-mode, six-channel linear LED current regulator IC for automotive rear lighting systems. It sinks up to 120 mA per channel across LED1–LED6, supports internal/external PWM dimming (200 Hz–2 kHz), features VIN derating (5–42 V), thermal foldback, and fault detection including open-LED, short-to-ground, and overtemperature. Used in DRL/position lamps with external P-MOSFET ballast.
For engineers reviewing the A6284KLPTR-T-1 datasheet, A6284KLPTR-T-1 pinout, A6284KLPTR-T-1 application, or A6284KLPTR-T-1 equivalent, this page delivers verified technical context, exact pin functions, real-world automotive use cases, and two validated alternative parts - all grounded in Allegro's official A6274-84-DS Rev. 4 documentation.
Technical Context
The A6284KLPTR-T-1 implements dual-group LED control (EN1/LED1–3 and EN2/LED4–6) with independent ISET1/ISET2 current programming and latched fault response (MODE1). Its internal PWM generator uses PWMIN-resistor tuning (195–2050 Hz) and DR-voltage-based duty cycle (5–93%), while FULL mode overrides dimming at VDR > 3.6 V.
It integrates a gate driver for external P-MOSFET pre-regulation (reducing IC power dissipation), thermal derating (TJM = TJF – 21°C), and multi-level fault protection: OUT short (VOUT < 1 V), LED string open (VOLED_dis = 5 × VVTH), and latch-on faults (FFn low until ENx/VIN toggle).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Max LED current per channel | 120 mA - enables high-brightness automotive LED strings without external current amplification |
| Input voltage range | 5–42 V - supports cold-crank (5 V), normal operation (14 V), and load-dump (42 V) in automotive 12 V systems |
| Current accuracy | ±2% typical - ensures consistent luminance across LED channels under temperature and supply variation |
| Current matching | ±0.8% typical - minimizes visible brightness mismatch between parallel LED strings |
| PWM dimming range | 200 Hz–2 kHz with 5–93% duty cycle - avoids audible noise and enables smooth brightness control |
| Fault response mode | Latched MODE1 - FFn remains low after fault detection until ENx or VIN toggled, ensuring fail-safe system behavior |
| Operating temperature | –40°C to +150°C (AEC-Q100 qualified) - meets automotive K-grade requirements for under-hood and exterior lighting |
Pinout & Package
Package: 20-pin eTSSOP (LP) with exposed thermal pad - optimized for high-power automotive LED driver thermal management on 4-layer PCBs (RθJA = 29°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| ISET1 | Current reference input | Sets sink current for LED1–LED3 (up to 120 mA); connect resistor to GND per ILED = 590 / RISET1 (kΩ) |
| ISET2 | Current reference input | Sets sink current for LED4–LED6 (up to 120 mA); tie to BIAS for matched 6-channel regulation |
| VTH | VIN derating threshold | Configures input overvoltage foldback start point (VINth(L) = 10 × VVTH + 1.6 V) |
| PWMIN | PWM mode select & frequency set | Resistor-to-GND sets internal PWM frequency; logic-high enables external PWM control |
| FFn | Active-low fault flag / bidirectional latch control | Outputs low on latched fault; accepts low pulse for one-out-all-out shutdown across multiple ICs |
| DR | Duty cycle control | Voltage (0–3.6 V) sets PWM duty cycle via VDR/VBIAS ratio; >3.6 V forces 100% FULL mode |
| EN1 / EN2 | Group enable inputs | Active-high enables LED1–3 (EN1) or LED4–6 (EN2); high-voltage tolerant for direct battery connection |
| GATE | P-MOSFET gate driver | Drives external ballast MOSFET; reduces IC power dissipation and enables input disconnect on fault |
Key Features
| Feature | Design Value |
|---|---|
| Latched fault response (MODE1) | FFn stays asserted until ENx or VIN toggled - prevents transient faults from causing intermittent lamp flicker in safety-critical lighting |
| Programmable VIN derating | VINth(L) adjustable from 18–36 V via VTH resistor divider - protects against thermal runaway during 42 V load-dump events |
| Thermal foldback with hysteresis | LED current drops gradually from 90% at TJM to 35% at TJL; full shutdown at 175°C with 30°C hysteresis - extends reliability in sealed lamp housings |
| Controlled output slew during PWM | LED current ramp time = 8 µs (10–90%) - reduces EMI emissions critical for automotive EMC compliance |
| Multi-fault detection with grouped reporting | Detects LED open, short-to-ground, mid-string short, OUT short, VIN overvoltage, and thermal faults - enables diagnostic logging per SAE J2354 |
Applications
| Automotive Rear Combination Light | DRL / Position Lamp |
|---|---|
|
Use Scenario: Integrated tail lamp assembly combining brake, turn, reverse, and position functions with dynamic dimming. IC Role / Device Role / Timing Role: Six-channel current sink regulating individual LED strings; EN1/EN2 enable group-level function switching; FULL/DIM mode controls daytime vs nighttime brightness. Use Value: Enables single-IC control of multi-function lighting with <0.8% channel matching - eliminates visible color/brightness shift between adjacent LEDs. |
Use Scenario: Front-end daylight running light with adaptive intensity based on ambient light and vehicle speed. IC Role / Device Role / Timing Role: LED current regulator with programmable PWM dimming (via DR pin) and VIN derating - maintains constant luminance across 5–42 V battery range. Use Value: Delivers stable 120 mA/channel drive even during cold-crank (5 V), avoiding DRL dropout during engine start. |
| Side Marker Lamp | Stop/Tail Lamp with Fault Diagnostics |
|
Use Scenario: Low-power side marker requiring precise current control and thermal resilience in compact housing. IC Role / Device Role / Timing Role: Dual-group current sink (EN1/EN2) driving two independent LED strings; thermal foldback prevents overheating in enclosed plastic housings. Use Value: Maintains ±2% current accuracy from –40°C to +150°C - ensures regulatory-compliant luminance across full automotive temperature range. |
Use Scenario: Safety-critical stop lamp with ASIL-B–compatible fault reporting and latch-on failure mode. IC Role / Device Role / Timing Role: Latched fault detector (MODE1) asserting FFn on open-LED, short-to-ground, or thermal events - triggers vehicle CAN alert via microcontroller. Use Value: Provides unambiguous, persistent fault indication (no auto-reset) - meets UNECE R149 functional safety requirements for exterior lighting. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED current regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| A6284KLPTR-T | Unlatched MODE0 fault response - FFn pulses low then auto-resumes; no manual reset required | Suitable for non-safety-critical lighting where transient faults should not disable output permanently | Select A6284KLPTR-T when system-level fault handling is managed externally and continuous operation is prioritized over fail-safe lockout |
| MAX16820ATP+ | 4-channel, 150 mA/channel; no integrated PWM generator; requires external MCU for dimming control | Lacks latched fault mode and VIN derating - needs additional circuitry for automotive voltage transients | Choose MAX16820ATP+ only if channel count reduction is acceptable and external PWM timing control is preferred over integrated analog dimming |
Compared with A6284KLPTR-T-1, the A6284KLPTR-T offers simpler fault recovery but less robust safety assurance, while the MAX16820ATP+ trades integrated dimming and fault intelligence for higher per-channel current and lower channel count - making A6284KLPTR-T-1 optimal for six-string, fail-safe automotive rear lighting.
Availability
A6284KLPTR-T-1 is available at Aetrix Electronics and suitable for automotive rear combination lights, DRL/position lamps, and side marker applications requiring stable component supply, AEC-Q100 qualification, and long-term production continuity.
Supply support for A6284KLPTR-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 designer of high-performance magnetic sensing and power ICs, specializing in automotive-grade motion control and energy-efficient power management solutions.
The A6284 product line delivers programmable, fault-protected LED current regulation for automotive exterior lighting - engineered to meet stringent AEC-Q100, EMC, and thermal requirements in harsh vehicular environments.
FAQ
What is the key functional difference between A6284KLPTR-T-1 and A6284KLPTR-T?
The A6284KLPTR-T-1 implements latched MODE1 fault response: once a fault (e.g., open-LED or overtemperature) occurs, FFn goes low and remains asserted until ENx or VIN is toggled. In contrast, A6284KLPTR-T uses unlatched MODE0, where FFn pulses low and automatically resumes operation after fault clearance. This makes A6284KLPTR-T-1 suitable for safety-critical lighting where persistent fault indication is required, while A6284KLPTR-T-1 is used where uninterrupted operation is prioritized.
How does the A6284KLPTR-T-1 achieve thermal protection without external components?
The A6284KLPTR-T-1 integrates on-die thermal monitoring that begins reducing LED current at TJM = TJF – 21°C (typically 154°C), drops to 35% at TJL = TJF – 7°C (168°C), and fully shuts down at TJF = 175°C with 30°C hysteresis. No external thermistor or sensor is needed - the IC autonomously manages power dissipation across its six channels using internal temperature sensing and analog foldback circuitry, as confirmed in the Electrical Characteristics table (page 6) and Figure 8 of the datasheet.
Can the A6284KLPTR-T-1 drive LED strings requiring more than 120 mA per channel?
No - the A6284KLPTR-T-1 is rated for maximum 120 mA per channel (LED1–LED6) under all operating conditions, as specified in the Selection Guide and Electrical Characteristics tables. However, LED pins can be paralleled (e.g., LED1 + LED2) to deliver up to 240 mA to a single string, provided PCB layout and thermal design accommodate the increased power dissipation. Derating applies above 125°C junction temperature, and external P-MOSFET ballasting is recommended for sustained high-current operation.
What is the role of the VTH pin in A6284KLPTR-T-1, and how is it configured?
The VTH pin sets both the VIN derating threshold (VINth(L)) and the open-LED disable voltage (VOLED_dis = 5 × VVTH). A resistor divider from BIAS (5 V) to GND configures VVTH; for example, VVTH = 1.64 V yields VINth(L) = 19 V (per VINth(L) = 10 × VVTH + 1.6). This allows designers to delay foldback until battery voltage exceeds safe levels during load-dump, while preventing false open-LED faults during cold-crank. Configuration is detailed in Figure 7 and Section "Input Overvoltage Derating".
Does the A6284KLPTR-T-1 require an external P-MOSFET for basic operation?
No - the A6284KLPTR-T-1 operates without an external P-MOSFET by connecting GATE and COMP directly to VIN, as stated in the Functional Description (page 12). However, using an external PMOS (e.g., NTB5605) reduces IC power dissipation, enables input disconnect on fault, and activates full fault detection (including OUT short and mid-string short). Omitting the MOSFET disables Faults A, B, and C per datasheet footnote on page 12.
A6284KLPTR-T-1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Allegro MicroSystems
- Series:
- -
- Package/Case:
- 20-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:
- 6
- Voltage - Supply (Min):
- 5V
- Voltage - Supply (Max):
- 42V
- Voltage - Output:
- -
- Current - Output / Channel:
- 120mA
- Frequency:
- -
- Dimming:
- PWM
- Applications:
- -
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TSSOP-EP
A6284KLPTR-T-1 FAQ
1.How can I place an order for A6284KLPTR-T-1 through Aetrix?
Please submit a Request for Quotation (RFQ) for A6284KLPTR-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 A6284KLPTR-T-1 reliable?
The price and inventory of A6284KLPTR-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 A6284KLPTR-T-1 is usually 5 days.
3.What payment methods are accepted for A6284KLPTR-T-1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for A6284KLPTR-T-1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for A6284KLPTR-T-1?
A6284KLPTR-T-1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your A6284KLPTR-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 A6284KLPTR-T-1?
For technical support, including A6284KLPTR-T-1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your A6284KLPTR-T-1 requirements.
6.How does Aetrix verify that A6284KLPTR-T-1 is sourced from the original manufacturer or authorized distributors?
All A6284KLPTR-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 A6284KLPTR-T-1 meets industry standards.
7.What is the process for return or replacement of A6284KLPTR-T-1?
All A6284KLPTR-T-1 units undergo pre-shipment inspection (PSI). If there is an issue with A6284KLPTR-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 A6284KLPTR-T-1 part is unused and in its original packaging.
Return procedure for A6284KLPTR-T-1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
A6284KLPTR-T-1 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…
