A6217KLJTR-T - 3A Automotive Buck LED Driver | Allegro
N.º da peça: A6217KLJTR-T ✓ Ativo| Qtd. | Preço unitário | Total |
|---|---|---|
| 1 | $2.42 | $2,42 |
| 10 | $2.18 | $21,80 |
| 100 | $1.96 | $196,00 |
| 500 | $1.74 | $870,00 |
| 1.000 | $1.55 | $1.550,00 |
| 3.000 | $1.37 | $4.110,00 |
A6217KLJTR-T Visão geral
A buck LED driver is a switching DC-DC converter whose output stage regulates inductor current rather than voltage, making it ideally matched to high-power LED loads. In the broader semiconductor hierarchy, the A6217 sits in the category chain: LED driver -> lighting driver IC -> power management IC -> semiconductor -> electronic component. The constant-current topology (as opposed to constant-voltage) guarantees uniform luminance across LED strings and tolerates forward-voltage variation between individual emitters.
Key features include AEC-Q100 automotive qualification, an internal 200 mΩ (typical) power MOSFET, programmable switching frequency up to 2.2 MHz (enabling a small external inductor), a high-voltage-tolerant EN/PWM pin for analog or PWM dimming down to near-zero duty cycle, and a 1 µA (typical) shutdown quiescent current. The package's exposed pad lowers thermal resistance so the IC can sustain the full 3 A load without a heatsink in moderate ambient temperatures.
The A6217 integrates robust protection features including adjacent-pin-to-pin short detection, pin-to-ground short detection, and open/short fault detection on the LED load. Switching-frequency dithering reduces EMI peak amplitude, easing CISPR 25 compliance for automotive applications. Enhancements over its predecessor A6213 include dithered switching, lower quiescent current, and a smaller package option.
Typical applications include automotive daytime running lights (DRLs), front and rear fog lamps, turn signals, interior ambient lighting, architectural and signage LED strips, industrial machine-vision LED illumination, and emergency-vehicle strobe lighting. The wide VIN range makes it suitable for both 12 V passenger-vehicle systems and 24 V commercial-truck systems.
When designing with this device, size the inductor for the chosen fSW to keep ripple below 30 % of the average LED current, and place the sense resistor close to the CS pin to minimize parasitic inductance. The exposed pad must be soldered to a copper pour of at least 1 square inch for rated thermal performance.
This page synthesizes distributor pricing, automotive-grade alternative options, and practical thermal and EMI design notes that are not collected in any one place in the manufacturer datasheet.
Alternativas drop-in para A6217KLJTR-T — mesmo encapsulamento, compatível pino a pino. Peças de encapsulamento diferente que exigem retrabalho na PCB são excluídas.
Variantes desta série
Modelos da mesma série compatíveis como drop-in com A6217KLJTR-T (mesmo formato e footprint) — diferindo em Package, Topology.
Ferramenta de comparação rápida — selecione peças alternativas para comparação lado a lado:
A6217KLJTR-1-T
✅ Drop-In✓ Em estoque
$0.43 / unidade
Ver ficha técnica →A6217KLJTR-T Classificações máximas e características elétricas
| Topologia | Synchronous Buck (Step-Down) Constant-Current LED Driver |
| Input Voltage Range (VIN) | 9 V to 46 V |
| Maximum LED Output Current | 3 A |
| Switching Frequency (fSW) | Programmable, up to 2.2 MHz |
| Dimming Interface | EN/PWM pin, analog/PWM-controlled |
| Shutdown Quiescent Current | 1 µA (typical) |
| Internal Power Switch | Integrated MOSFET |
| Automotive Qualification | AEC-Q100 qualified |
| Encapsulamento | 8-pin SOIC-EP (exposed pad) |
| Tipo de montagem | Surface Mount |
| Tape and Reel | Yes (TR suffix) |
| Protection Features | Adjacent pin-to-pin short, pin-to-GND short, LED open/short, thermal shutdown |
| EMI Feature | Switching-frequency dithering |
| Status RoHS | Compliant |
| Reference Part Type | Replacement / upgrade for A6213 |
Configuração de pinos do A6217KLJTR-T
| Pino 1 | VIN — Input supply voltage (9 V to 46 V) |
| Pino 2 | EN/PWM — Enable / PWM dimming input, high-voltage tolerant |
| Pino 3 | CS — Current sense input - connect to external sense resistor |
| Pino 4 | GND — Ground |
| Pino 5 | SW — Switch node to external inductor |
| Pino 6 | NC — Not connected (per datasheet) |
| Pino 7 | NC — Not connected (per datasheet) |
| Pino 8 | EP — Exposed thermal pad - connect to GND pour |
Aplicações típicas
A6217KLJTR-T é adequado para 7 aplicaçãos: Automotive Daytime Running Lights (DRL), Automotive Front Fog and Turn-Signal Lamps, Interior and Ambient Automotive Lighting, Commercial-Truck and Bus Exterior Lighting, Industrial High-Bay LED Fixtures, Architectural and Signage LED Strip Lighting, Emergency Vehicle Strobe and Warning Lights.
Automotive Daytime Running Lights (DRL)
The A6217KLJTR-T is well matched to automotive DRL strings driven directly from the 12 V or 24 V vehicle bus. Its 9 V to 46 V input range covers load-dump transients and cold-crank events, and the AEC-Q100 qualification is mandatory for under-hood or front-lighting modules. With 3 A of constant-current capability, a single A6217 can drive a multi-LED DRL string without binning or current calibration. The integrated switching-frequency dithering lowers peak EMI emissions and eases CISPR 25 compliance testing for OEM modules.
Recomendado
Automotive Front Fog and Turn-Signal Lamps
Front fog lamps and turn signals require PWM dimming for flashing and progressive signaling, both natively supported by the A6217KLJTR-T EN/PWM input. The pin accepts a logic-level or high-voltage PWM source and translates the duty cycle directly into LED brightness. With 3 A drive capability and a 46 V ceiling, the same IC handles both 12 V and 24 V vehicle platforms without modification. Fault detection for adjacent pin shorts and LED open/short conditions is essential for ASIL-rated lighting modules.
Recomendado
Interior and Ambient Automotive Lighting
Interior ambient lighting uses many parallel LED strings, each requiring independent constant-current regulation for uniform brightness. The A6217KLJTR-T can drive high-power ambient strings with deep PWM dimming, enabling smooth color and intensity transitions. Its 8-pin SOIC-EP package fits compact overhead-console and door-trim PCBAs, and the 1 µA shutdown current minimizes quiescent drain on always-on cabin lighting. AEC-Q100 qualification ensures long-term reliability in the -40 C to +125 C cabin environment.
Recomendado
Commercial-Truck and Bus Exterior Lighting
24 V commercial trucks and buses have higher bus voltages and longer cable runs that demand robust 46 V-tolerant LED drivers. The A6217KLJTR-T operates directly from 24 V nominal with headroom for load-dump transients up to 46 V, making it ideal for trailer marker lights, brake lights, and turn signals on heavy vehicles. Integrated fault diagnostics allow the truck ECU to detect LED open/short conditions and alert the driver, supporting FMVSS lighting compliance.
Recomendado
Industrial High-Bay LED Fixtures
Industrial high-bay LED fixtures often run from 24 VDC or 36 VDC industrial buses and require drivers with fault tolerance and long operational life. The A6217KLJTR-T delivers 3 A constant current to high-power LED arrays, with switching frequencies up to 2.2 MHz that allow a small inductor and slim-line fixture housing. AEC-Q100 qualification, although automotive-targeted, also provides high reliability margins in industrial applications with wide temperature swings.
Recomendado
Architectural and Signage LED Strip Lighting
Architectural and signage LED strips require PWM dimming for animated effects, deep dimming to very low duty cycles for nighttime operation, and high reliability for continuous-duty commercial installations. The A6217KLJTR-T EN/PWM input supports analog or digital dimming, while the 46 V input range accommodates long LED strings with high forward voltage. The exposed-pad SOIC-EP package provides the thermal headroom needed for sealed outdoor fixtures where convective cooling is limited.
Recomendado
Emergency Vehicle Strobe and Warning Lights
Emergency vehicle strobes require precise PWM control for flash patterns and high reliability for first-responder duty cycles. The A6217KLJTR-T supports fast PWM dimming transitions and 3 A output, capable of driving high-intensity LED strobe arrays directly from the 12 V vehicle bus. AEC-Q100 qualification ensures operation under extreme vibration and temperature conditions encountered in emergency-vehicle service.
Recomendado
Resumo dos produtos recomendados
Dados de referência de engenharia para A6217KLJTR-T — comparação, orientação de projeto e informações de conformidade.
Guia de seleção
Comparação com alternativas
| Parâmetro | Este produto | A6217KLJTR-1-T |
|---|---|---|
| Package | 8-SOIC-EP | 8-SOIC-EP - same |
| Brand | Allegro MicroSystems | Allegro MicroSystems |
| Topology | Buck, constant-current LED driver | Buck, constant-current LED driver |
| Input Voltage Range | 9 V to 46 V | 9 V to 46 V |
| Maximum Output Current | 3 A | 1.5 A |
| Switching Frequency | Up to 2.2 MHz | Up to 2.2 MHz |
| AEC-Q100 Qualified | Yes | Yes |
| Dimming Interface | EN/PWM pin | EN/PWM pin |
| Unit Price (qty 1) | USD 2.42 | USD 1.85 (approx) |
Principais diferenciais
- Higher output current than the lower-rated A6217KLJTR-1-T (vs A6217KLJTR-1-T)
- Enhanced fault detection vs older A6213 family (vs A6213)
- Switching-frequency dithering for EMI reduction (vs A6213)
Notas de projeto
The 8-pin SOIC-EP relies on the exposed pad for thermal dissipation. At 3 A output and VIN = 24 V, VLED = 12 V, power dissipation is approximately 3 W. Solder the exposed pad to a copper pour of at least 1 square inch (645 mm^2) to keep junction temperature rise within rated limits. Estimated: with 4-layer 1 oz PCB and 1 sq inch copper, theta_JA is around 40 C/W, giving a junction-to-ambient rise of approximately 120 C at 3 W - acceptable only if ambient is below +100 C.
Place the input capacitor, sense resistor, and bootstrap components as close to the IC pins as possible to minimize parasitic inductance. The CS pin is particularly sensitive: route the sense-resistor ground return directly to the IC GND pin using a Kelvin connection. The SW node traces should be short and wide to reduce EMI and voltage stress on the internal MOSFET.
If the EN/PWM pin voltage exceeds VIN, a 1 kohm series resistor is required to limit the input current per the Allegro A6217 datasheet. Do not omit the sense resistor - the IC regulates current through the CS pin and will not function correctly without a defined sense voltage. Avoid reverse polarity on the input; the A6217 does not include internal reverse-battery protection and requires an external TVS or Schottky diode.
The integrated switching-frequency dithering spreads the EMI spectrum to ease CISPR 25 compliance for automotive modules. Per the Allegro datasheet, this enhancement over the older A6213 family reduces peak EMI by several dB without requiring external filtering. For severe-EMI environments, an input ferrite bead and pi-filter network (LC) at VIN can further attenuate conducted emissions.
Informações de conformidade
AEC-Q100 qualified per Allegro product page and distributor listings. RoHS and REACH compliance confirmed by Allegro MicroSystems product documentation.
