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Allegro MicroSystems A6217KEJTR-J
- Part No.:
- A6217KEJTR-J
- Manufacturer:
- Allegro MicroSystems
- Category:
- LED Drivers
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
A6217KEJTR-J.pdf
- Description:
- IC LED DRIVER RGLTR PWM 3A 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,859
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Product details
Overview
A6217KEJTR-J from Allegro MicroSystems is an automotive-grade, constant-current PWM-dimmable buck LED driver IC with integrated high-side N-channel DMOS switch, 6–48 V input range, 3 A max output current, and true average current regulation via cycle-by-cycle controlled on-time. It drives single-string high-power LEDs in automotive lighting systems including daytime running lights and dimmable interior lights.
For engineers reviewing the A6217KEJTR-J datasheet, A6217KEJTR-J pinout, A6217KEJTR-J application, or A6217KEJTR-J equivalent, this page delivers verified technical context, validated pin functions, confirmed thermal and electrical specs, and real-world dimming and fault-handling behavior - all specific to the EJ-package variant with wettable flank DFN-10 footprint.
Technical Context
The A6217KEJTR-J implements fixed on-time, average current mode control with dithered switching frequency (±5% around programmed value) to reduce EMI. Its internal control loop uses a 0.2 V CS-regulation threshold and integrates UVLO (5.3 V), thermal shutdown (165 °C), and cycle-by-cycle current limiting (4.0 A typical).
It supports direct logic-level or high-voltage (up to VIN) PWM dimming via the EN pin, with programmable off-time up to 20 ms before shutdown. The device features robust fault protection against pin-to-GND shorts, adjacent pin shorts, open/short external components, and missing Schottky diode detection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 6–48 V - supports full automotive battery range including cold-crank and load-dump transients. |
| Max Output Current | 3 A - rated over full operating temperature range (−40°C to +125°C junction). |
| CS Regulation Threshold | 200 mV ±10 mV - sets precise average LED current via external sense resistor (iLED = 0.2 V / RSENSE). |
| Switching Frequency Range | Programmable 0.5–2 MHz via external RTON; dithered ±5% at ~11 kHz modulation rate for EMI reduction. |
| Thermal Resistance (Junction-to-Ambient) | 45 °C/W - measured on 4-layer JEDEC-standard PCB; requires thermal pad soldering to GND for performance. |
| Shutdown Current | 1 µA typical - enables ultra-low power state during EN low >20 ms. |
| UVLO Threshold | 5.3 V with 150 mV hysteresis - ensures reliable startup after battery recovery and prevents brown-out oscillation. |
Pinout & Package
Package: Wettable flank 10-pin DFN (3 mm × 3 mm), exposed thermal pad (PAD), lead-free with 100% matte-tin plating. Requires GND connection of PAD for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2 - VIN | Supply input | Primary DC input (6–48 V); connects to bulk and ceramic input capacitors; high-current path. |
| 3 - TON | Frequency programming | Sets on-time and switching frequency via resistor to VIN; determines dithered fSW (0.5–2 MHz). |
| 4 - EN | Enable / PWM dimming input | Logic-compatible (1.8 V high, 0.4 V low); accepts direct VIN-level signals; controls startup, shutdown, and 100 Hz–2 kHz PWM dimming. |
| 5 - CS | Current sense feedback | Monitors voltage across external RSENSE; regulates average LED current at 0.2 V reference. |
| 6 - VCC | Internal LDO output | 5.4 V ±0.3 V regulated supply for internal circuitry; requires 0.1 µF decoupling to GND. |
| 7 - GND | Ground reference | Analog and power ground; must be connected to exposed PAD and system GND plane. |
| 8 - BOOT | Bootstrap gate drive | Provides floating bias for high-side MOSFET gate; requires 0.1 µF ceramic capacitor to SW. |
| 9, 10 - SW | Switch node | High dv/dt node connecting internal DMOS drain to external inductor and diode; routing must minimize loop area. |
| PAD | Exposed thermal pad | Must be soldered to solid GND copper pour; primary thermal path (RθJP = 2 °C/W). |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 qualified | Grade 1 (−40°C to +125°C ambient) - validated for automotive under-hood and cabin lighting applications. |
| True average current regulation | 0.2 V CS threshold with cycle-by-cycle on-time control - maintains consistent LED brightness independent of Vf drift or temperature. |
| Dithered switching frequency | ±5% spread at ~11 kHz modulation - reduces peak EMI by distributing energy across narrow band, easing EMC compliance. |
| Integrated high-side DMOS switch | 0.25 Ω typical RDS(on) at 25°C - eliminates external FET, simplifies layout, and improves efficiency in compact designs. |
| Robust fault protection suite | Detects and shuts down on pin-to-GND short, adjacent pin short, open/short RSENSE, missing Schottky diode, and overtemperature - enables fail-safe operation. |
Applications
| Daytime Running Lights (DRL) | Front/Rear Fog Lights |
|---|---|
Use Scenario: Continuous 24/7 illumination in variable ambient light, requiring stable luminous flux across battery voltage swings (9–16 V) and temperature (−40°C to +85°C). IC Role / Device Role / Timing Role: Constant-current buck regulator with PWM dimming capability and thermal foldback - maintains 3 A LED string current while adapting to thermal derating. Use Value: Eliminates need for external current-sense amplifier and gate driver; achieves >90% efficiency at 12 V input and 7 V output with 1 MHz switching. |
Use Scenario: High-intensity, weather-resistant lighting activated only in low-visibility conditions, demanding rapid startup (<70 µs), high reliability, and EMI resilience near radar/sensors. IC Role / Device Role / Timing Role: Automotive-grade LED driver with dithered switching and fault diagnostics - suppresses conducted EMI and reports open-load or short-circuit faults. Use Value: Meets CISPR 25 Class 5 radiated emissions without output capacitor; supports 200 Hz–2 kHz PWM dimming for adaptive beam shaping. |
| Turn/Stop Lights | Dimmable Interior Lights |
Use Scenario: Fast-response signaling (≤100 ms rise/fall) with high peak current (3 A) and strict thermal management in confined rear lamp housings. IC Role / Device Role / Timing Role: High-current buck controller with cycle-by-cycle current limit and thermal shutdown - prevents LED overcurrent during transient load changes. Use Value: Delivers 3 A peak current with <100 ns minimum on-time; thermal shutdown at 165 °C with 25 °C hysteresis avoids nuisance tripping during pulsed operation. |
Use Scenario: User-adjustable cabin lighting with smooth 1–100% dimming range, low-noise operation, and compatibility with vehicle CAN bus-controlled dimming profiles. IC Role / Device Role / Timing Role: PWM-dimmable LED driver with logic-level EN interface and low standby current - interfaces directly with microcontroller GPIO or LIN transceiver outputs. Use Value: 1 µA shutdown current extends battery life; 20 ms EN timeout enables graceful fade-out; supports analog dimming via external voltage injection on CS pin. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar constant-current buck LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| A6217KEJTR-1-J | 1.5 A max output (vs. 3 A); identical EJ package, pinout, and feature set. | Targeted for lower-power LED strings (e.g., map lights, courtesy lights) where thermal margin or cost optimization is prioritized. | Select when design does not require full 3 A capability; shares same PCB footprint and firmware interface. |
| AL8862Q-7 | 3 A max output, AEC-Q100 Grade 1, but uses external high-side MOSFET and requires separate compensation network. | Offers greater flexibility in MOSFET selection and thermal partitioning, but increases BOM count and layout complexity. | Choose when higher voltage tolerance (>60 V) or discrete FET replacement is needed; not pin-compatible with A6217KEJTR-J. |
Compared with A6217KEJTR-J, A6217KEJTR-1-J provides identical functionality at reduced current rating and lower thermal stress, while AL8862Q-7 trades integration for design flexibility - making the former a drop-in revision and the latter a system-level architecture alternative.
Availability
A6217KEJTR-J is available at Aetrix Electronics and suitable for automotive lighting, industrial signage, and transportation lighting applications requiring stable component supply despite end-of-life status.
Supply support for A6217KEJTR-J 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 magnetic sensing, power ICs, and motor control solutions for automotive and industrial markets.
The A6217 product line delivers AEC-Q100-qualified constant-current LED drivers optimized for automotive exterior and interior lighting, emphasizing robustness, EMI control, and seamless PWM/analog dimming integration.
FAQ
Is A6217KEJTR-J still recommended for new designs?
No - A6217KEJTR-J is officially discontinued per Allegro's September 30, 2024 status update. It is no longer in production, samples are unavailable, and new designs should use A6217KEJTR-1-J or consult Allegro for latest alternatives. A6217KEJTR-J remains supported for legacy manufacturing and repair with documented lifecycle management.
What is the maximum LED string voltage supported by A6217KEJTR-J?
A6217KEJTR-J supports up to ~20.3 V output (at VIN = 24 V, fSW = 1 MHz, tOFF(min) = 150 ns), enabling up to six 3.3 V white LEDs in series. Minimum output is ~2.4 V (VIN = 24 V, tON(min) = 100 ns), sufficient for single-LED operation. Actual VOUT range depends on input voltage, switching frequency, and inductor selection.
How does PWM dimming work on the A6217KEJTR-J EN pin?
A6217KEJTR-J accepts 100 Hz–2 kHz PWM signals directly on the EN pin. LED brightness scales linearly with duty cycle; e.g., 50 µs on-time at 5 ms period yields 1% dimming. EN is logic- and high-voltage tolerant (up to VIN), with 1.8 V VIH and 0.4 V VIL thresholds. Dimming occurs without startup delay during active PWM cycles.
Does A6217KEJTR-J require an output capacitor across the LED string?
No - A6217KEJTR-J is designed to operate stably without an output capacitor. Adding one (e.g., 0.68 µF ceramic) reduces LED current ripple but introduces dimming response delay and may reduce maximum achievable dimming ratio. Capacitors must be placed between LED+ and LED−, never LED+ to GND, to avoid control-loop instability.
What thermal design considerations apply to the A6217KEJTR-J DFN-10 package?
A6217KEJTR-J's wettable flank DFN-10 package has RθJA = 45 °C/W on a 4-layer JEDEC board. Successful thermal design requires soldering the exposed PAD to a solid GND copper pour (minimum 100 mm²), using ≥4 thermal vias (0.3 mm diameter), and minimizing trace resistance from PAD to system GND. Derating is required above 85°C ambient.
A6217KEJTR-J Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Allegro MicroSystems
- Series:
- -
- Package/Case:
- 10-WFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- DC DC Regulator
- Topology:
- Step-Down (Buck)
- Internal Switch(s):
- Yes
- Number of Outputs:
- 1
- Voltage - Supply (Min):
- 6V
- Voltage - Supply (Max):
- 48V
- Voltage - Output:
- -
- Current - Output / Channel:
- 3A
- Frequency:
- -
- Dimming:
- PWM
- Applications:
- -
- Operating Temperature:
- 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-DFN (3x3)
A6217KEJTR-J FAQ
1.How can I place an order for A6217KEJTR-J through Aetrix?
Please submit a Request for Quotation (RFQ) for A6217KEJTR-J 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 A6217KEJTR-J reliable?
The price and inventory of A6217KEJTR-J are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for A6217KEJTR-J is usually 5 days.
3.What payment methods are accepted for A6217KEJTR-J?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for A6217KEJTR-J transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for A6217KEJTR-J?
A6217KEJTR-J orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your A6217KEJTR-J 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 A6217KEJTR-J?
For technical support, including A6217KEJTR-J datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your A6217KEJTR-J requirements.
6.How does Aetrix verify that A6217KEJTR-J is sourced from the original manufacturer or authorized distributors?
All A6217KEJTR-J 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 A6217KEJTR-J meets industry standards.
7.What is the process for return or replacement of A6217KEJTR-J?
All A6217KEJTR-J units undergo pre-shipment inspection (PSI). If there is an issue with A6217KEJTR-J, 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 A6217KEJTR-J part is unused and in its original packaging.
Return procedure for A6217KEJTR-J:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
A6217KEJTR-J Tags
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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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