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Allegro MicroSystems A6214KLKTR-T
- Part No.:
- A6214KLKTR-T
- Manufacturer:
- Allegro MicroSystems
- Category:
- LED Drivers
- Package:
- 10-LSOP (0.154", 3.90mm Width) Exposed Pad
- Datasheet:
-
A6214KLKTR-T.pdf
- Description:
- IC LED DRVR RGLTR PWM 2A 10SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:48,629
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Product details
Overview
A6214KLKTR-T from Allegro MicroSystems is an automotive-grade, constant-current buck LED driver IC with integrated high-side N-channel DMOS switch, 4.5–55 V input range, 2 A max output current, true average current control via cycle-by-cycle on-time regulation, and PWM/analog dimming support - used in daytime running lights, fog lights, and dimmable interior lighting.
For engineers reviewing the A6214KLKTR-T datasheet, A6214KLKTR-T pinout, A6214KLKTR-T application, or A6214KLKTR-T equivalent, key selection criteria include its AEC-Q100 qualification, 10-pin SOICN package with exposed thermal pad, 200 mV current-sense threshold, 5 V/10 mA internal LDO, and absence of internal PWM generation or fault flag (distinguishing it from A6216).
Technical Context
The A6214KLKTR-T implements fixed on-time, average current-mode buck regulation with external RTON-programmed switching frequency (e.g., 1 MHz at RTON = 402 kΩ). Its current sense architecture uses differential inputs (CSH/CSL) referenced to a 200 mV internal regulation threshold, enabling precise LED current setting via RSENSE.
Dimming is supported exclusively via external logic-level PWM applied to EN/PWM or analog voltage (0.4–2.1 V) on ADIM for brightness calibration or thermal foldback. It lacks internal PWM generation, fault reporting, or DR/FULL/RANGE/FPWM pins - features exclusive to the A6216 variant.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5 V to 55 V - supports wide automotive battery transients including cold-crank and load-dump conditions. |
| Max Output Current | 2 A - sustained over –40°C to +125°C ambient, enabled by integrated 0.25 Ω (typ) high-side MOSFET and exposed thermal pad. |
| Current Sense Threshold | 200 mV ±3 mV - sets LED current via RSENSE = 0.2 V / ILED; enables <1% current accuracy with proper layout and Radj fine-tuning. |
| Internal LDO Output | 5 V ±150 mV, 10 mA - powers external bias circuitry (e.g., NTC thermistor network) without auxiliary regulator. |
| PWM Dimming Range | Down to 0.1% duty cycle at 200 Hz - achieved with ≥5 µs minimum on-time; requires careful inductor/VIN selection per application. |
| Thermal Protection | Junction shutdown at 150°C (±15°C hysteresis) - prevents thermal runaway during overload or poor heatsinking. |
| Package Thermal Resistance | RθJA = 35 °C/W (4-layer JEDEC PCB) - mandates thermal pad soldering to GND plane for full 2 A capability. |
Pinout & Package
Package: 10-pin narrow SOIC (SOICN), suffix LK, with exposed thermal pad (PAD) - must be soldered to PCB GND plane for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 VIN | Power input | Supplies IC bias and buck converter; accepts 4.5–55 V with UVLO at 4.3 V (150 mV hysteresis). |
| 2 TON | Frequency programming | Connects to VIN via resistor to set on-time (800–1200 ns typ) and thus switching frequency (e.g., ~500 kHz at 402 kΩ). |
| 3 EN/PWM | Enable & dimming input | Logic-high enables regulation; PWM signal here achieves 0.1%–100% dimming; >17 ms low triggers 1 µA shutdown mode. |
| 4 ADIM | Analog dimming control | 0.4–2.1 V input linearly scales LED current from 20% to 100%; tied to VCC if unused. |
| 5 VCC | Bias regulator output | 5 V, 10 mA LDO output; powers external circuits; decoupled with 1 µF MLCC to GND. |
| 6 GND | Ground reference | Primary ground return for IC core, current sense, and thermal pad connection point. |
| 7 CSL | Current sense low | Differential input (with CSH) measuring voltage across RSENSE; sinks 75 µA typical bias current. |
| 8 CSH | Current sense high | Differential input (with CSL); sources –190 µA typical bias current; rejects common-mode noise up to 50 V. |
| 9 BOOT | Bootstrap gate drive | Charges high-side MOSFET gate driver; requires 0.1 µF ceramic capacitor between BOOT and SW. |
| 10 SW | Switch node | Drives buck inductor; switches between VIN and GND; rated for –0.3 V to VIN+0.3 V continuous. |
| PAD | Exposed thermal pad | Must be connected to GND plane; accounts for >90% of thermal conduction; reduces RθJA by ~25 °C/W vs. non-thermal pad SOIC. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 1 qualification | Validated for –40°C to +125°C operation with full automotive reliability testing (HTOL, TC, UHAST). |
| True average current regulation | Eliminates LED brightness variation due to ripple; maintains constant luminous output regardless of LED forward-voltage drift. |
| Integrated 5 V/10 mA LDO | Reduces BOM count by powering external analog circuitry (e.g., NTC-based thermal foldback networks) directly from VCC. |
| Cycle-by-cycle current limiting | Trips at 2.5–4 A (min–max) to protect MOSFET and inductor during short-circuit or startup faults. |
| Robust fault protection suite | Detects and recovers from LED open/short, diode missing, adjacent pin shorts, and thermal overload - no external supervision required. |
| Low-power shutdown mode | Draws only 1 µA typical when EN is held low >17 ms - critical for always-on automotive modules with strict quiescent current budgets. |
Applications
| Daytime Running Lights (DRL) | Front/Rear Fog Lights |
|---|---|
Use Scenario: Continuous 24/7 operation under varying ambient temperatures and battery voltages (9–16 V). IC Role / Device Role / Timing Role: Constant-current buck controller regulating 1.2–2 A through 2–4 series white LEDs. Use Value: Maintains consistent lumen output despite LED Vf drift and input voltage sag; AEC-Q100 ensures 15-year field life. |
Use Scenario: High-intensity, thermally demanding illumination in wet/dirty conditions requiring rapid thermal foldback. IC Role / Device Role / Timing Role: LED driver with analog dimming input (ADIM) interfaced to NTC thermistor for real-time current derating. Use Value: Prevents LED overheating and color shift by reducing current linearly as temperature rises - no microcontroller needed. |
| Turn/Stop Lights | Dimmable Interior Map Lights |
Use Scenario: Fast-switching, high-peak-current pulses (e.g., 2 A @ 100 Hz PWM) during brake activation. IC Role / Device Role / Timing Role: PWM-dimmable buck regulator accepting direct logic-level EN/PWM input for instant on/off control. Use Value: Achieves 0.1% dimming resolution (1000:1) with <150 µs startup delay - meets ECE R148 photometric response requirements. |
Use Scenario: User-adjustable cabin lighting with smooth brightness transitions and low-noise operation. IC Role / Device Role / Timing Role: Analog-dimming-capable LED driver using ADIM pin voltage (0.4–2.1 V) for linear 20–100% current scaling. Use Value: Enables flicker-free, silent dimming without EMI from high-frequency PWM - ideal for occupant comfort and camera systems. |
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 |
|---|---|---|---|
| AL8862SP-13 | Non-AEC-Q100; 40 V max input; no integrated LDO; requires external bootstrap diode. | Suitable for industrial/commercial lighting only; lacks automotive thermal robustness and bias supply. | Select only for cost-sensitive non-automotive designs where 55 V input and 5 V LDO are unnecessary. |
| MPQ4425AGU-AEC1-P | AEC-Q100 qualified; 40 V max input; integrated 5 V/200 mA LDO; supports I²C dimming. | Offers digital interface and higher drive capability but larger 16-pin QFN package and higher BOM cost. | Choose when system requires programmable dimming profiles or >2 A output; avoid if pin count or footprint is constrained. |
Compared with A6214KLKTR-T, AL8862SP-13 lacks automotive qualification and bias regulation, while MPQ4425AGU-AEC1-P adds digital control and higher LDO capacity at the expense of size and complexity - making A6214KLKTR-T optimal for compact, analog-dimming-focused automotive LED modules.
Availability
A6214KLKTR-T is available at Aetrix Electronics and suitable for daytime running lights, fog lights, and turn/stop lighting requiring stable component supply across automotive production lifecycles.
Supply support for A6214KLKTR-T 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.
The A6214KLKTR-T belongs to Allegro's automotive LED driver product line, engineered specifically for robust, thermally efficient constant-current regulation in safety-critical exterior and interior lighting systems.
FAQ
What is the maximum LED string voltage supported by the A6214KLKTR-T?
The A6214KLKTR-T does not specify a fixed maximum output voltage; instead, VOUT is dynamically limited by minimum off-time (75 ns) and switching frequency. At 500 kHz and 12 V input, maximum duty cycle yields ~9.6 V output - sufficient for three 3.2 V white LEDs in series. For higher strings, reduce fSW via larger RTON to extend tOFF. The A6214KLKTR-T's current sense amplifier operates down to 2.65 V, setting the practical lower bound.
Can the A6214KLKTR-T drive multiple parallel LED strings?
No - the A6214KLKTR-T is designed exclusively for single-string, constant-current operation using differential current sensing (CSH/CSL). Driving parallel strings would cause current imbalance due to Vf mismatch and violate the device's regulation architecture. For multi-string applications, use one A6214KLKTR-T per string or select a matrix-driver IC.
Does the A6214KLKTR-T require an external bootstrap diode?
No - the A6214KLKTR-T integrates a charge pump for bootstrap capacitor (CBOOT) replenishment and does not require an external bootstrap diode. A 0.1 µF X7R ceramic capacitor must be placed between BOOT and SW pins, with short, low-inductance traces to ensure reliable high-side gate drive under all operating conditions.
How is thermal foldback implemented using the ADIM pin on the A6214KLKTR-T?
Thermal foldback is implemented by connecting an NTC thermistor in a resistor divider between VCC and GND, with the divider midpoint feeding the ADIM pin. As temperature rises, NTC resistance drops, lowering ADIM voltage below 2.1 V and linearly reducing LED current - e.g., from 100% at 25°C to 20% at 85°C. The A6214KLKTR-T's ADIM input has 75 µA bias current, so divider resistors must be selected to minimize loading error.
Is the A6214KLKTR-T pin-compatible with the A6216KLPTR-T?
No - the A6214KLKTR-T (10-pin SOICN) and A6216KLPTR-T (16-pin TSSOP) have entirely different pin counts, functions, and layouts. The A6216 adds FPWM, DR, FULL, RANGE, and FAULT pins absent on A6214KLKTR-T. PCB redesign and schematic changes are required for substitution; they are functional alternatives, not drop-in replacements.
A6214KLKTR-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Allegro MicroSystems
- Series:
- -
- Package/Case:
- 10-LSOP (0.154", 3.90mm Width) 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):
- 4.5V
- Voltage - Supply (Max):
- 55V
- Voltage - Output:
- -
- Current - Output / Channel:
- 2A
- Frequency:
- -
- Dimming:
- Analog, PWM
- Applications:
- -
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-SOIC
A6214KLKTR-T FAQ
1.How can I place an order for A6214KLKTR-T through Aetrix?
Please submit a Request for Quotation (RFQ) for A6214KLKTR-T 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 A6214KLKTR-T reliable?
The price and inventory of A6214KLKTR-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for A6214KLKTR-T is usually 5 days.
3.What payment methods are accepted for A6214KLKTR-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for A6214KLKTR-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for A6214KLKTR-T?
A6214KLKTR-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your A6214KLKTR-T 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 A6214KLKTR-T?
For technical support, including A6214KLKTR-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your A6214KLKTR-T requirements.
6.How does Aetrix verify that A6214KLKTR-T is sourced from the original manufacturer or authorized distributors?
All A6214KLKTR-T 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 A6214KLKTR-T meets industry standards.
7.What is the process for return or replacement of A6214KLKTR-T?
All A6214KLKTR-T units undergo pre-shipment inspection (PSI). If there is an issue with A6214KLKTR-T, 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 A6214KLKTR-T part is unused and in its original packaging.
Return procedure for A6214KLKTR-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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