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Allegro MicroSystems A6210GEUTR-T
- Part No.:
- A6210GEUTR-T
- Manufacturer:
- Allegro MicroSystems
- Category:
- LED Drivers
- Package:
- 16-WQFN Exposed Pad
- Datasheet:
-
A6210GEUTR-T.pdf
- Description:
- IC LED DRIVER RGLTR PWM 3A 16QFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,654
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Product details
Overview
A6210GEUTR-T from Allegro MicroSystems is a 3 A, 2 MHz valley current-mode buck-regulating LED driver optimized for high-input-voltage (9–46 V) applications with low LED span voltages (e.g., 10.5 V across 3×3.5 V LEDs). It integrates power MOSFETs, bootstrap supply, top-off charge pump, and thermal/UVLO protection. Its 0.183 V typical current-sense threshold enables high efficiency (>90%) in MR16/MR11 LED lamp modules.
For engineers reviewing the A6210GEUTR-T datasheet, A6210GEUTR-T pinout, A6210GEUTR-T application, or A6210GEUTR-T equivalent, key selection factors include programmable on-time (via external resistor), PWM brightness control via DIS pin, no-output-capacitor operation, 50 ns minimum on-time, and thermally enhanced 4 mm × 4 mm QFN package with exposed pad.
Technical Context
The A6210GEUTR-T employs valley current-mode control with feed-forward input voltage modulation to maintain stable switching frequency across line and load variations. On-time is set by external resistor R1 connected to TON pin, enabling precise frequency tuning up to 2.0 MHz without loop compensation components.
It integrates internal housekeeping regulators, bootstrap capacitor charging circuitry, and top-off charge pump for light-load stability. Protection includes VIN undervoltage lockout (6.3–7.5 V threshold), overtemperature shutdown (165 °C), and automatic recovery upon fault removal with DIS = low.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | Up to 3.0 A continuous LED current - supports high-brightness multi-LED strings without external current amplification. |
| Switching Frequency | 0.1–2.0 MHz programmable - enables compact 68 μH inductors and eliminates need for output capacitor. |
| Input Voltage Range | 9–46 V - compatible with 12/24/36 V industrial and automotive LED lighting rails. |
| Current Sense Threshold | 183 mV typical - minimizes I²R loss in sense resistor (e.g., 390 mΩ yields 470 mA valley current for 500 mA average). |
| Minimum On-Time | 50 ns - supports high-frequency operation even at 46 V input without pulse-skipping. |
| Quiescent Current | <100 μA in shutdown - enables low-power standby in battery-backed or energy-sensitive systems. |
| Thermal Resistance θJA | 36 °C/W on JEDEC 4-layer PCB - ensures reliable 3 A operation with standard thermal pad layout and vias. |
Pinout & Package
Package: 16-contact, 4 mm × 4 mm × 0.75 mm QFN with exposed thermal pad (Allegro Package EU); RoHS-compliant, lead-free, 100% matte tin plating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Input supply rail | Accepts 9–46 V DC; powers internal regulators and high-side switch; requires local 1 μF ceramic decoupling. |
| TON | On-time programming node | Current-sinking input; sets switching frequency via external resistor (e.g., 180 kΩ → 1.4 MHz at 24 V). |
| ISEN | Current sense input | Monitors voltage drop across external sense resistor (R2); triggers valley-current comparator at 183 mV. |
| SGND | Current-sense ground reference | Separate ground return for ISEN to avoid noise coupling into precision current sensing path. |
| DIS | Enable/disable logic input | Active-high digital control; open-circuit disables regulator; PWM at ≥10 kHz enables smooth LED dimming. |
| BOOT | Bootstrap supply node | Charges external 22 nF capacitor to drive high-side MOSFET gate above VIN; critical for proper LX switching. |
| LX | Switch node | Connects to inductor and Schottky recirculation diode; switches between VIN and GND at full switching frequency. |
| GND / NC / PAD | Ground / No-connect / Thermal pad | Pins 2,7,13–16 are NC (tie to GND); pins 4–6 are GND; exposed pad must be soldered to PCB ground plane with ≥4 thermal vias. |
Key Features
| Feature | Design Value |
|---|---|
| Valley current-mode control | Enables stable regulation at high frequencies without external compensation; maintains constant frequency under line/load transients. |
| Programmable on-time via TON pin | Allows precise frequency selection (0.1–2.0 MHz) using single resistor - eliminates need for oscillator IC or timing capacitor. |
| PWM brightness control via DIS pin | Supports direct 10 kHz PWM dimming without external FET or gate driver - simplifies system-level LED intensity management. |
| No output capacitor required | Reduces BOM count and board area; eliminates ESR-related stability concerns and capacitor aging effects in long-life LED lamps. |
| Integrated top-off charge pump | Maintains BOOT voltage during light loads - prevents dropout and ensures consistent gate drive down to near-zero LED current. |
| Comprehensive fault protection | Includes VIN UVLO (6.3–7.5 V), thermal shutdown (165 °C), and auto-recovery - enhances reliability in unattended lighting installations. |
Applications
| MR16 LED Lamps | Automotive Interior Lighting |
|---|---|
|
Use Scenario: Replacement of halogen MR16 lamps in 12/24 V AC/DC track lighting systems with constant-current LED modules. IC Role / Device Role / Timing Role: Primary buck-regulating LED driver providing 500 mA constant current to 3-LED string at 10.5 V span. Use Value: Enables >90% efficiency and compact 68 μH inductor footprint while eliminating output capacitor - critical for tight MR16 form factor. |
Use Scenario: Ambient and accent lighting in vehicle cabins powered from 12 V battery with wide cold-crank voltage range (6–16 V). IC Role / Device Role / Timing Role: High-efficiency LED current controller supporting PWM dimming synchronized to vehicle CAN bus commands. Use Value: Wide 9–46 V input range accommodates cold-crank dips and load-dump surges; 100 μA shutdown current extends battery life. |
| Industrial LED Spotlights | Architectural Linear Lighting |
|
Use Scenario: High-lumen directional spotlights for warehouse and retail environments operating from 24/36 V DC centralized power supplies. IC Role / Device Role / Timing Role: Constant-current source delivering 2.4 A to 22 μH-driven LED arrays with 15 V span voltage. Use Value: 2 MHz capability allows ultra-small magnetics; thermal pad + 36 °C/W θJA sustains full 3 A output in enclosed fixtures. |
Use Scenario: Long-run linear LED strips requiring uniform brightness across 1–3 m segments powered from 42 V distribution rails. IC Role / Device Role / Timing Role: Buck regulator driving 1.34 A through 47 μH inductor with 24 V LED assembly voltage. Use Value: Valley-current control ensures ripple-insensitive current regulation; no output cap simplifies daisy-chained module design. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck-regulating LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM3409HVMM/NOPB | Peak current-mode control; requires external compensation; 0.21 V sense threshold; max 1.5 MHz. | Needs output capacitor for loop stability; less tolerant of high VIN/low VLED ratios due to longer min on-time (100 ns). | Prefer A6210GEUTR-T for >1.5 MHz designs, no-capacitor topology, or tighter thermal constraints in 4 mm QFN space. |
| MAX16820ATA+T | Fixed 500 kHz frequency; integrated high-side switch only; 0.25 V sense threshold; no TON programming. | Limited flexibility for EMI optimization; lower max output current (1.5 A); requires external bootstrap diode. | Choose A6210GEUTR-T when programmable frequency, 3 A capability, or valley-mode stability across wide LED span ranges is required. |
Compared with LM3409HVMM/NOPB and MAX16820ATA+T, the A6210GEUTR-T delivers higher switching frequency headroom (2.0 MHz), lower sense voltage (183 mV), and true valley-current regulation - making it uniquely suited for compact, high-efficiency LED drivers where input voltage exceeds LED string voltage by >2×.
Availability
A6210GEUTR-T is available at Aetrix Electronics and suitable for MR16 lamp modules, automotive interior lighting, and industrial LED spotlights requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for A6210GEUTR-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 designer of high-performance power ICs and magnetic sensors, headquartered in Worcester, Massachusetts, serving automotive, industrial, and consumer markets since 1989.
The A6210GEUTR-T belongs to Allegro's high-voltage LED driver product line, engineered specifically for cost-sensitive, thermally constrained LED lighting applications demanding high efficiency, small solution size, and robust fault protection.
FAQ
What is the minimum recommended inductor value for A6210GEUTR-T at 24 V input and 10.5 V LED span?
The minimum inductor value depends on target ripple current and switching frequency. For 500 mA average current and 60 mA peak-to-peak ripple at 1.4 MHz, the calculated value is 72 μH; Allegro recommends 68 μH (e.g., Taiyo Yuden NR6045T-680M) as standard. Lower values risk exceeding 350 ns minimum off-time at low VIN, compromising bootstrap operation. The A6210GEUTR-T datasheet specifies 22 μH as viable in Application Circuit 2 (2.4 A, 15 V span), confirming design flexibility within validated boundaries.
Can A6210GEUTR-T operate without an output capacitor, and why is this possible?
Yes, the A6210GEUTR-T is explicitly designed to operate without an output capacitor. This is enabled by valley current-mode control, which inherently stabilizes the current loop without voltage-loop compensation. The device regulates LED current directly via the ISEN pin and sense resistor, eliminating the need for output capacitance to filter ripple or close a voltage feedback path. This reduces BOM cost, board area, and long-term reliability risks associated with electrolytic or high-ESR ceramic capacitors - a key advantage confirmed in all application circuits on page 1 and page 9 of the A6210GEUTR-T datasheet.
How does the TON pin set switching frequency in A6210GEUTR-T, and what resistor value gives 2.0 MHz at 24 V?
The TON pin sinks current proportional to VIN, setting on-time via Ton = (VIN × 2.05 × 10¹⁰) / R1. At 24 V, solving for R1 to achieve ~2.0 MHz yields ≈120 kΩ (using simplified formula R1 = VIN × 2.05 × 10¹⁰ / fSW). However, due to minimum off-time (350 ns) limits, 2.0 MHz is only achievable with low LED span voltages (e.g., 1 LED @ 3.5 V). For 24 V input and 3-LED string (10.5 V), 1.4 MHz (R1 = 180 kΩ) is the validated maximum per the datasheet's frequency vs. R1 plot and typical application. The A6210GEUTR-T's TON interface thus enables precise, resistor-based frequency tuning within practical design boundaries.
What is the purpose of the SGND pin, and why is it separate from main GND?
The SGND pin provides a dedicated, low-noise ground reference exclusively for the ISEN current-sense amplifier. Separating it from power GND (pins 4–6) prevents switching noise from the LX node and high-current paths from corrupting the 183 mV sense voltage measurement. This isolation ensures accurate valley-current detection - critical for stable regulation and consistent LED brightness. The A6210GEUTR-T datasheet mandates routing SGND directly to the sense resistor's ground side with short, isolated trace, confirming its role in preserving analog measurement integrity amid high dv/dt switching events.
Does A6210GEUTR-T support analog dimming, or is brightness control limited to PWM on the DIS pin?
Brightness control for the A6210GEUTR-T is limited to PWM applied to the DIS pin; it does not support analog dimming. The DIS pin is a digital enable/disable input - pulling it high disables the regulator, pulling it low enables it. Rapid toggling (≥10 kHz) creates effective LED dimming by modulating average current, as demonstrated in Figure 4 of the datasheet. There is no internal DAC, current-adjustment register, or analog control interface. All performance data (e.g., 500 mA average current, 60 mA ripple) assumes DIS-driven PWM, and the A6210GEUTR-T's architecture provides no provision for continuous analog current scaling.
A6210GEUTR-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Allegro MicroSystems
- Series:
- -
- Package/Case:
- 16-WQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- DC DC Regulator
- Topology:
- Step-Down (Buck)
- Internal Switch(s):
- -
- Number of Outputs:
- 1
- Voltage - Supply (Min):
- 9V
- Voltage - Supply (Max):
- 46V
- Voltage - Output:
- -
- Current - Output / Channel:
- 3A
- Frequency:
- 2MHz
- Dimming:
- PWM
- Applications:
- -
- Operating Temperature:
- -40°C ~ 105°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-QFN (4x4)
A6210GEUTR-T FAQ
1.How can I place an order for A6210GEUTR-T through Aetrix?
Please submit a Request for Quotation (RFQ) for A6210GEUTR-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 A6210GEUTR-T reliable?
The price and inventory of A6210GEUTR-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for A6210GEUTR-T is usually 5 days.
3.What payment methods are accepted for A6210GEUTR-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for A6210GEUTR-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for A6210GEUTR-T?
A6210GEUTR-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your A6210GEUTR-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 A6210GEUTR-T?
For technical support, including A6210GEUTR-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your A6210GEUTR-T requirements.
6.How does Aetrix verify that A6210GEUTR-T is sourced from the original manufacturer or authorized distributors?
All A6210GEUTR-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 A6210GEUTR-T meets industry standards.
7.What is the process for return or replacement of A6210GEUTR-T?
All A6210GEUTR-T units undergo pre-shipment inspection (PSI). If there is an issue with A6210GEUTR-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 A6210GEUTR-T part is unused and in its original packaging.
Return procedure for A6210GEUTR-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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