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Texas Instruments LM3409QMYX/NOPB
- Part No.:
- LM3409QMYX/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 10-PowerTFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LM3409QMYX/NOPB.pdf
- Description:
- IC LED DRIVER CTRLR PWM 10HVSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,054
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Product details
Overview
LM3409QMYX/NOPB from Texas Instruments is a P-channel MOSFET buck controller for high-power LED current regulation, supporting 6 V to 42 V input voltage, differential high-side current sensing with 198 mV typical threshold, and constant off-time (COFT) control enabling up to 5 A output current without loop compensation. It is used in automotive headlamp drivers and industrial LED lighting systems requiring stable analog/PWM dimming.
For engineers reviewing the LM3409QMYX/NOPB datasheet, LM3409QMYX/NOPB pinout, LM3409QMYX/NOPB application, or LM3409QMYX/NOPB equivalent, key selection criteria include its 10-pin HVSSOP thermal pad package, 2 Ω gate drive strength, 10,000:1 PWM dimming range, and UVLO programmability via resistor divider - all critical for robust LED driver design under wide VIN and temperature variation.
Technical Context
The LM3409QMYX/NOPB implements a Controlled Off-Time (COFT) architecture combining peak current detection with an output-voltage-dependent one-shot off-timer, enabling automatic operation in both CCM and DCM without external compensation. Its differential high-side current sense amplifier alternates input polarity each cycle to cancel offset error, ensuring accurate average LED current regulation.
It integrates a 6 V linear regulator (VCC) referenced to VIN for gate drive power, supports analog dimming via IADJ pin voltage (0–1.24 V), and provides fast enable/disable response (21 ns EN-falling delay) for high-frequency PWM dimming. Thermal shutdown and low-power shutdown (110 µA ISD) are built-in safety features.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 6 V to 42 V - supports 12 V/24 V automotive and industrial DC bus inputs without external step-down. |
| Current Sense Threshold | 198 mV typical - sets LED current via external sense resistor; adjustable from 0 to 248 mV using IADJ pin. |
| Gate Drive Strength | 2 Ω sourcing/sinking - drives P-MOSFET gates directly with 1-A peak current, minimizing external driver needs. |
| PWM Dimming Range | 10,000:1 - enables high-contrast brightness control in display backlighting and adaptive lighting. |
| Shutdown Current | 110 µA - ensures ultra-low system standby power in battery-powered or energy-sensitive applications. |
| Thermal Package | HVSSOP-10 with exposed thermal pad - achieves 54.4°C/W junction-to-ambient resistance for reliable 5 A continuous operation. |
| EN Pin Threshold | 1.74 V rising - allows direct interface with 1.8 V/3.3 V logic without level-shifting circuitry. |
Pinout & Package
LM3409QMYX/NOPB uses a thermally enhanced 10-pin HVSSOP (DGQ) package (3.00 mm × 3.00 mm) with an exposed thermal pad connected to GND for optimal heat dissipation in high-current LED driver PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| UVLO | Input undervoltage lockout | Resistor divider input; 1.24 V turn-on threshold with 22 µA hysteresis current for stable startup at varying VIN. |
| IADJ | Analog current adjust | Multi-function pin: open-circuit = 1.24 V reference; 0–1.24 V input = proportional current threshold; resistor-to-GND = precision analog dimming. |
| EN | Enable / PWM dimming input | Logic-level control: >1.74 V enables, <0.5 V shuts down, PWM signal applied directly for 10,000:1 dimming. |
| COFF | Off-time programming | Connects to ROFF and COFF; sets tOFF via exponential charging to 1.24 V threshold - determines switching frequency and inductor ripple. |
| GND | System ground reference | Power and signal return; thermal pad must be soldered to GND plane via ≥4 vias for thermal performance. |
| PGATE | P-MOSFET gate driver output | Drives external high-side P-channel switch; 2 Ω drive strength supports fast turn-on/turn-off with minimal gate ringing. |
| CSN | Negative current sense input | Connects to low side of sense resistor; differential pair with CSP enables accurate high-side sensing without shunt ground disruption. |
| CSP | Positive current sense input | Connects to high side of sense resistor and VIN; forms differential pair with CSN for noise-immune current measurement. |
| VCC | VIN-referenced LDO output | 6 V regulated supply for internal logic and gate drive; requires ≥1 µF ceramic capacitor to VIN for stability. |
| VIN | Main power input | 6–42 V supply input; powers internal circuitry and feeds VCC regulator; also connects to CSP for high-side sensing reference. |
Key Features
| Feature | Design Value |
|---|---|
| No control loop compensation required | COFT architecture eliminates need for external compensation network - reduces BOM count and layout sensitivity. |
| Differential high-side current sense | Rejects common-mode noise and avoids ground path disruption - enables precise current regulation in high-noise automotive environments. |
| 10,000:1 PWM dimming range | Supports full brightness control from 0.01% to 100% without color shift - essential for automotive adaptive driving beams (ADB). |
| 250:1 analog dimming range | Enables smooth, flicker-free brightness adjustment via IADJ voltage - suitable for human-centric lighting and medical displays. |
| Thermally enhanced HVSSOP-10 | Exposed thermal pad + low RθJA (54.4°C/W) sustains 5 A LED current at TJ ≤ 125°C in compact form factor. |
Applications
| Automotive Headlamps | Industrial High-Bay Lighting |
|---|---|
Use Scenario: Adaptive front-lighting system (AFS) with matrix LED arrays requiring independent zone dimming and thermal derating. IC Role / Device Role / Timing Role: Constant-current buck controller regulating individual LED strings; PGATE drives external P-MOSFET per channel. Use Value: 10,000:1 PWM dimming enables pixel-level beam shaping; differential current sense maintains ±3% current accuracy across -40°C to 125°C. |
Use Scenario: 150 W LED fixture for warehouse lighting operating from 24–42 V DC distribution bus. IC Role / Device Role / Timing Role: Primary current regulator controlling 3.5 A through 12-series LEDs; COFF pin sets fixed off-time for stable 250 kHz operation. Use Value: No-loop-compensation design simplifies EMI filtering; HVSSOP thermal pad enables convection-cooled metal-core PCB without heatsink. |
| Commercial Display Backlighting | Emergency Exit Sign Drivers |
Use Scenario: Large-format LCD video wall with local dimming zones powered by 24 V DC supply. IC Role / Device Role / Timing Role: Analog-dimming controller using IADJ voltage to set string current; EN pin synchronized to video frame rate for strobing. Use Value: 250:1 analog dimming ensures smooth grayscale transitions; 110 µA shutdown current extends backup battery life during black frames. |
Use Scenario: UL 924-compliant exit sign with dual-string red LEDs operating from 12 V battery backup. IC Role / Device Role / Timing Role: Fault-tolerant current regulator with thermal shutdown and UVLO hysteresis preventing brownout-induced flicker. Use Value: AEC-Q100 Grade 1 qualified reliability ensures 10-year field life; 6 V minimum VIN supports deep battery discharge down to 10.5 V. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar P-FET buck LED controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM3409HVQMYX/NOPB | 75 V max VIN vs 42 V; identical pinout, features, and COFT architecture. | Required for 48 V telecom or 60 V industrial bus systems where LM3409QMYX/NOPB would exceed absolute max rating. | Select LM3409HVQMYX/NOPB only when input exceeds 42 V; otherwise LM3409QMYX/NOPB offers lower cost and same performance. |
| TPS92691QPWPRQ1 | Integrated N-MOSFET gate driver + current sense amplifier; supports 4.5–40 V VIN; requires external compensation. | Higher integration reduces external components but adds complexity for high-current (>3 A) designs due to thermal limits on integrated FET. | Choose TPS92691QPWPRQ1 for space-constrained designs below 3 A; LM3409QMYX/NOPB preferred for >4 A with discrete P-MOSFET flexibility and superior thermal management. |
Compared with LM3409HVQMYX/NOPB and TPS92691QPWPRQ1, LM3409QMYX/NOPB delivers optimal balance of 42 V operation, zero-compensation simplicity, and HVSSOP thermal performance for cost-sensitive, high-reliability LED drivers - especially where discrete P-MOSFET selection enables optimized efficiency and ruggedness.
Availability
LM3409QMYX/NOPB is available at Aetrix Electronics and suitable for automotive lighting, industrial LED fixtures, and commercial display backlighting requiring stable component supply and long-term production continuity.
Supply support for LM3409QMYX/NOPB 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
Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and power management ICs, with decades of automotive-grade product development and AEC-Q100 qualification expertise.
LM3409QMYX/NOPB belongs to TI's high-reliability LED driver controller product line, designed specifically for constant-current buck regulation in demanding automotive and industrial lighting applications where thermal robustness and dimming fidelity are critical.
FAQ
What is the maximum LED current achievable with LM3409QMYX/NOPB?
The LM3409QMYX/NOPB is a controller-not a driver IC-so maximum LED current depends on external components. With appropriate P-MOSFET, inductor, and sense resistor selection, it reliably regulates up to 5 A in continuous conduction mode. The 198 mV typical current sense threshold and 2 Ω gate drive enable efficient high-current operation without saturation or thermal runaway. LM3409QMYX/NOPB itself imposes no internal current limit.
Does LM3409QMYX/NOPB require external compensation components?
No. LM3409QMYX/NOPB uses a Controlled Off-Time (COFT) architecture that inherently stabilizes the control loop without external compensation. This eliminates the need for feedback resistors, capacitors, or op-amp networks-reducing bill-of-materials cost and layout sensitivity while improving transient response. All stability is managed internally via the off-time timer and peak current comparator.
How does the differential current sense work on LM3409QMYX/NOPB?
LM3409QMYX/NOPB uses a true differential high-side current sense between CSP and CSN pins, measuring voltage across an external sense resistor placed between VIN and the LED string anode. Its comparator alternates input polarity every switching cycle to cancel offset error, delivering ±3% current accuracy over temperature. This avoids ground-path disruption and improves noise immunity versus single-ended sensing.
Can LM3409QMYX/NOPB support both analog and PWM dimming simultaneously?
No-LM3409QMYX/NOPB supports analog dimming via the IADJ pin (0–1.24 V) or PWM dimming via the EN pin, but not both concurrently. Analog dimming adjusts the current sense threshold continuously; PWM dimming rapidly enables/disables regulation. Using both introduces unpredictable interaction between threshold setting and duty-cycle control, risking instability or inaccurate dimming curves. LM3409QMYX/NOPB is optimized for either method independently.
What thermal management is required for LM3409QMYX/NOPB at 5 A output?
At 5 A continuous load, LM3409QMYX/NOPB requires its exposed thermal pad to be soldered to a solid GND plane using ≥4 thermal vias (0.3 mm diameter) to an internal or bottom-layer copper pour. With this layout, junction temperature stays ≤125°C at ambient 85°C and 42 V input. The HVSSOP-10 package's 54.4°C/W RθJA rating assumes 2 oz copper and adequate board area; omitting thermal vias risks thermal shutdown above 3.5 A.
LM3409QMYX/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 10-PowerTFSOP, 10-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- DC DC Controller
- Topology:
- Step-Down (Buck)
- Internal Switch(s):
- No
- Number of Outputs:
- 1
- Voltage - Supply (Min):
- 6V
- Voltage - Supply (Max):
- 42V
- Voltage - Output:
- -
- Current - Output / Channel:
- -
- Frequency:
- -
- Dimming:
- Analog, PWM
- Applications:
- -
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-HVSSOP
LM3409QMYX/NOPB FAQ
1.How can I place an order for LM3409QMYX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3409QMYX/NOPB 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 LM3409QMYX/NOPB reliable?
The price and inventory of LM3409QMYX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM3409QMYX/NOPB is usually 5 days.
3.What payment methods are accepted for LM3409QMYX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3409QMYX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3409QMYX/NOPB?
LM3409QMYX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3409QMYX/NOPB 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 LM3409QMYX/NOPB?
For technical support, including LM3409QMYX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3409QMYX/NOPB requirements.
6.How does Aetrix verify that LM3409QMYX/NOPB is sourced from the original manufacturer or authorized distributors?
All LM3409QMYX/NOPB 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 LM3409QMYX/NOPB meets industry standards.
7.What is the process for return or replacement of LM3409QMYX/NOPB?
All LM3409QMYX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM3409QMYX/NOPB, 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 LM3409QMYX/NOPB part is unused and in its original packaging.
Return procedure for LM3409QMYX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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