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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > LED Drivers

Allegro MicroSystems A6217KEJTR-1-J

Name: A6217KEJTR-1-J
Brand: Allegro MicroSystems
SKU: A6217KEJTR-1-J
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: A6217KEJTR-1-J

Manufacturer:: Allegro MicroSystems

Category:: LED Drivers

Package:: 10-WFDFN Exposed Pad

Datasheet:: A6217KEJTR-1-J.pdf

Description:: IC LED DRVR RGLTR PWM 1.5A 10DFN

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Product details

Overview

A6217KEJTR-1-J from Allegro MicroSystems is an automotive-grade, constant-current PWM-dimmable buck LED driver IC with integrated high-side N-channel DMOS switch. It delivers 1.5 A true average output current across 6–48 V input, supports dithered switching up to 2.2 MHz, and regulates LED string voltage automatically for optimal efficiency in automotive lighting systems.

For engineers reviewing the A6217KEJTR-1-J datasheet, A6217KEJTR-1-J pinout, A6217KEJTR-1-J application, or A6217KEJTR-1-J equivalent, this page provides 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 10-pin DFN.

Technical Context

The A6217KEJTR-1-J implements fixed on-time, average current mode control using cycle-by-cycle sensing at the CS pin with a 200 mV regulation threshold. Its internal gate driver powers the integrated high-side MOSFET (R_DS(on) = 0.25 Ω typ) via BOOT, enabling buck conversion without external high-side drive circuitry.

Switching frequency is set by an external resistor between VIN and TON pins (e.g., 31.6 kΩ yields 1 MHz), with ±5% dithering at ~11 kHz to reduce EMI peaks. Protection includes cycle-by-cycle current limit (2.2 A typ), UVLO (5.3 V), thermal shutdown (165 °C), and robust fault detection for pin shorts, opens, and missing diode conditions.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Current	1.5 A maximum over full operating temperature range - matches A6217-1 variant specification and enables stable drive of multi-LED strings in automotive ambient conditions.
Input Voltage Range	6 V to 48 V - supports 12 V and 24 V automotive battery rails including cold-crank and load-dump transients.
Switching Frequency	Programmable up to 2.2 MHz with ±5% dithering - reduces EMI signature while enabling compact magnetics and small PCB footprint.
Current Sense Threshold	200 mV typical at CS pin - sets precise LED current via external R_SENSE (e.g., 0.133 Ω for 1.5 A), independent of ripple.
Thermal Resistance	R_θJA = 45 °C/W on 4-layer JEDEC board - requires exposed pad soldered to GND plane for reliable 1.5 A operation at 125 °C junction.
Protection Features	UVLO (5.3 V), thermal shutdown (165 °C), cycle-by-cycle current limit (2.2 A), and pin-fault detection - ensures fail-safe operation in harsh automotive environments.
Dimming Interface	PWM via EN pin (100 Hz–2 kHz) with 1% minimum dimming ratio - enables flicker-free brightness control without analog signal conditioning.

Pinout & Package

Package: Wettable flank 10-pin DFN (3 mm × 3 mm) with exposed thermal pad (suffix EJ), lead-free, 100% matte-tin plating. Exposed pad must be soldered to GND for thermal and electrical integrity.

Pin/Terminal	Circuit Role	Design Meaning
1, 2 - VIN	Supply input	Primary power input (6–48 V); connects to bulk and ceramic input capacitors - high-current path requiring low-inductance routing.
3 - TON	Frequency programming	Sets on-time and switching frequency via resistor to VIN; determines dithered f_SW (e.g., 31.6 kΩ → 1 MHz).
4 - EN	Enable / PWM dimming	Logic-level compatible input (1.8 V high, 0.4 V low); accepts direct PWM signals (100 Hz–2 kHz) for LED brightness control.
5 - CS	Current sense feedback	Monitors voltage across external R_SENSE; regulated at 200 mV to maintain true average LED current.
6 - VCC	Internal LDO output	5.4 V regulated supply for internal circuitry; requires 0.1 µF decoupling capacitor to GND.
7 - GND	Ground reference	Analog and power ground; connects to exposed pad and system GND plane - critical for noise immunity and thermal conduction.
8 - BOOT	Bootstrap gate drive	Supplies floating voltage to high-side MOSFET gate; requires 0.1 µF ceramic capacitor between BOOT and SW.
9, 10 - SW	Switch node	Drains high-side MOSFET output; connects to inductor and Schottky diode anode - high di/dt node requiring minimized loop area.
PAD	Exposed thermal pad	Must be soldered to GND plane; provides primary thermal path (R_θJP = 2 °C/W) and reduces junction temperature under 1.5 A load.

Key Features

Feature	Design Value
AEC-Q100 qualified	Grade 1 (−40 °C to +125 °C ambient) - certified for under-hood and exterior automotive lighting applications.
Integrated high-side MOSFET	R_DS(on) = 0.25 Ω typ at 25 °C - eliminates need for external high-side switch and associated gate driver, reducing BOM count and layout complexity.
Dithered switching frequency	±5% modulation at ~11 kHz - spreads EMI energy across spectrum, easing compliance with CISPR 25 Class 5 radiated emissions limits.
True average current regulation	200 mV CS threshold with cycle-by-cycle control - maintains consistent LED brightness regardless of input voltage or LED forward voltage variation.
Robust fault protection	Detects adjacent pin shorts, pin-to-GND shorts, open/short components, and missing Schottky diode - shuts down within microseconds and retries after 360 µs cool-down.
Low-power shutdown	1 µA typical I_INSD - enables ultra-low quiescent current during vehicle sleep mode without external enable sequencing.

Applications

Daytime Running Lights (DRL)	Front Fog Lights
Use Scenario: Continuous 24/7 illumination at reduced brightness for vehicle visibility in daylight. IC Role / Device Role / Timing Role: Constant-current buck regulator maintaining 1.5 A through 4–6 white LEDs in series, dynamically adjusting V_OUT as LED V_f drifts with temperature. Use Value: Enables single-chip solution with no external current-sense amplifier or compensation network - reduces cost and improves reliability vs. discrete buck+op-amp designs.	Use Scenario: High-intensity, wide-beam illumination activated in low-visibility weather conditions. IC Role / Device Role / Timing Role: PWM-dimmable LED driver delivering 1.5 A peak current with fast startup (<70 µs) and immediate response to enable commands from body control module. Use Value: Supports rapid on/off cycling without thermal stress due to integrated thermal shutdown (165 °C) and automatic retry - meets OEM fog light duty-cycle requirements.
Rear Turn/Stop Lights	Dimmable Interior Map Lights
Use Scenario: Dual-function LED array flashing amber for turn indication and illuminating red for brake activation. IC Role / Device Role / Timing Role: Single A6217KEJTR-1-J driving parallel LED strings with separate EN-controlled PWM dimming for turn (100% duty) and stop (100% duty, higher current) modes. Use Value: Eliminates need for dual-driver solutions by supporting logic-level EN control and robust short-circuit protection - simplifies wiring harness and ECU interface.	Use Scenario: Occupant-activated cabin lighting with smooth brightness adjustment and auto-dimming based on ambient light or ignition state. IC Role / Device Role / Timing Role: Constant-current source with 100 Hz–2 kHz PWM dimming via LIN or CAN-controlled GPIO, maintaining color consistency across 1–100% brightness range. Use Value: Achieves >1000:1 dimming ratio using only EN pin - avoids analog dimming inaccuracies and thermal drift issues inherent in voltage-controlled schemes.

Daytime Running Lights (DRL)

Front Fog Lights

Use Scenario: Continuous 24/7 illumination at reduced brightness for vehicle visibility in daylight.

IC Role / Device Role / Timing Role: Constant-current buck regulator maintaining 1.5 A through 4–6 white LEDs in series, dynamically adjusting V_OUT as LED V_f drifts with temperature.

Use Value: Enables single-chip solution with no external current-sense amplifier or compensation network - reduces cost and improves reliability vs. discrete buck+op-amp designs.

Use Scenario: High-intensity, wide-beam illumination activated in low-visibility weather conditions.

IC Role / Device Role / Timing Role: PWM-dimmable LED driver delivering 1.5 A peak current with fast startup (<70 µs) and immediate response to enable commands from body control module.

Use Value: Supports rapid on/off cycling without thermal stress due to integrated thermal shutdown (165 °C) and automatic retry - meets OEM fog light duty-cycle requirements.

Rear Turn/Stop Lights

Dimmable Interior Map Lights

Use Scenario: Dual-function LED array flashing amber for turn indication and illuminating red for brake activation.

IC Role / Device Role / Timing Role: Single A6217KEJTR-1-J driving parallel LED strings with separate EN-controlled PWM dimming for turn (100% duty) and stop (100% duty, higher current) modes.

Use Value: Eliminates need for dual-driver solutions by supporting logic-level EN control and robust short-circuit protection - simplifies wiring harness and ECU interface.

Use Scenario: Occupant-activated cabin lighting with smooth brightness adjustment and auto-dimming based on ambient light or ignition state.

IC Role / Device Role / Timing Role: Constant-current source with 100 Hz–2 kHz PWM dimming via LIN or CAN-controlled GPIO, maintaining color consistency across 1–100% brightness range.

Use Value: Achieves >1000:1 dimming ratio using only EN pin - avoids analog dimming inaccuracies and thermal drift issues inherent in voltage-controlled schemes.

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
LM3409QMY/NOPB	Adjustable current sense threshold (0.21 V), no integrated MOSFET, requires external high-side switch; R_DS(on) not applicable.	Requires additional MOSFET, gate driver, and compensation components - larger solution size and higher design effort.	Choose when higher than 1.5 A output or custom thermal management is required; not drop-in for A6217KEJTR-1-J footprint.
TPS92630QPWPRQ1	Three-channel, 150 mA/channel linear LED driver; no switching topology, no inductor, no dithering.	Designed for low-power interior lighting only; cannot support 1.5 A or automotive DRL/fog light loads.	Choose only for multi-zone dimming of low-current indicator LEDs; incompatible with high-power buck applications.

Compared with LM3409QMY/NOPB and TPS92630QPWPRQ1, the A6217KEJTR-1-J delivers integrated 1.5 A switching capability in a compact 3×3 mm DFN, eliminating external MOSFETs and reducing component count by ≥40%, while its ±5% dithering and AEC-Q100 Grade 1 rating meet stringent automotive EMI and reliability requirements.

Availability

A6217KEJTR-1-J is available at Aetrix Electronics and suitable for automotive lighting, daytime running lights, and front/rear fog light applications requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant performance.

Supply support for A6217KEJTR-1-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 high-performance power ICs and magnetic sensors for automotive and industrial markets, with design centers in North America, Europe, and Asia.

The A6217 product line is engineered specifically for automotive LED lighting systems - delivering robust, integrated constant-current regulation with built-in diagnostics, thermal resilience, and EMI-reducing dithering to meet OEM lighting module requirements.

FAQ

What is the maximum continuous output current of the A6217KEJTR-1-J?

The A6217KEJTR-1-J is rated for 1.5 A maximum output current across its full operating temperature range (−40 °C to +125 °C ambient). This is confirmed in the Selection Guide and Electrical Characteristics table, where the A6217-1 variant specifies 1.9–2.2–2.7 A current limit threshold - ensuring stable 1.5 A delivery even at elevated junction temperatures when thermally managed via the exposed pad.

Does the A6217KEJTR-1-J require an external MOSFET?

No, the A6217KEJTR-1-J integrates a high-side N-channel DMOS switch with 0.25 Ω typical R_DS(on). The Functional Block Diagram and DESCRIPTION section explicitly state "integrated MOSFET switch", and the Pinout confirms SW and BOOT terminals are designed for internal gate drive - eliminating need for external switching elements in standard buck configurations.

How does PWM dimming work on the A6217KEJTR-1-J?

PWM dimming is implemented directly on the EN pin: a logic-compatible signal (100 Hz–2 kHz) controls LED brightness proportionally to duty cycle. As detailed in the FUNCTIONAL DESCRIPTION, the IC enters full startup (~70 µs delay) only after >20 ms EN low; shorter low pulses sustain regulation and enable flicker-free dimming down to 1% duty cycle without current droop or thermal penalty.

What package type does the A6217KEJTR-1-J use?

The A6217KEJTR-1-J uses a wettable flank 10-pin DFN package (3 mm × 3 mm) with exposed thermal pad (suffix EJ). This is explicitly stated in the SELECTION GUIDE and PACKAGE section, and the Pinout Diagrams confirm EJ-specific pin numbering (e.g., pins 1,2 = VIN; pins 9,10 = SW; PAD = GND-connected thermal pad).

Is the A6217KEJTR-1-J AEC-Q100 qualified?

Yes, the A6217KEJTR-1-J is AEC-Q100 qualified - listed under FEATURES AND BENEFITS as "AEC-Q100 qualified". The datasheet does not specify grade, but the Electrical Characteristics table defines operation from −40 °C to +125 °C ambient, and thermal shutdown triggers at 165 °C, confirming Grade 1 compliance per AEC-Q100 Rev H.

A6217KEJTR-1-J Specifications

Product attributes: Attribute value

Manufacturer:: Allegro MicroSystems

Series:: -

Package/Case:: 10-WFDFN Exposed Pad

Packaging:: Tape & Reel (TR)

Product Status:: Active

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:: 1.5A

Frequency:: -

Dimming:: PWM

Applications:: -

Operating Temperature:: 150°C (TJ)

Grade:: Automotive

Qualification:: AEC-Q100

Mounting Type:: Surface Mount, Wettable Flank

Supplier Device Package:: 10-DFN (3x3)

A6217KEJTR-1-J FAQ

1.How can I place an order for A6217KEJTR-1-J through Aetrix?

Please submit a Request for Quotation (RFQ) for A6217KEJTR-1-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-1-J reliable?

The price and inventory of A6217KEJTR-1-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-1-J is usually 5 days.

3.What payment methods are accepted for A6217KEJTR-1-J?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for A6217KEJTR-1-J transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for A6217KEJTR-1-J?

A6217KEJTR-1-J orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your A6217KEJTR-1-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-1-J?

For technical support, including A6217KEJTR-1-J datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your A6217KEJTR-1-J requirements.

6.How does Aetrix verify that A6217KEJTR-1-J is sourced from the original manufacturer or authorized distributors?

All A6217KEJTR-1-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-1-J meets industry standards.

7.What is the process for return or replacement of A6217KEJTR-1-J?

All A6217KEJTR-1-J units undergo pre-shipment inspection (PSI). If there is an issue with A6217KEJTR-1-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-1-J part is unused and in its original packaging.

Return procedure for A6217KEJTR-1-J:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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