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Texas Instruments LM3409MYX/NOPB
- Part No.:
- LM3409MYX/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 10-PowerTFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LM3409MYX/NOPB.pdf
- Description:
- IC LED DRIVER CTRLR PWM 10HVSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:59,317
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Product details
Overview
LM3409MYX/NOPB from Texas Instruments is a P-channel MOSFET buck controller for high-power LED current regulation, featuring 6 V to 42 V input range, differential high-side current sensing with 198 mV typical threshold, 2 Ω peak gate drive, and constant off-time (COFT) control enabling stable constant-current output up to 5 A in automotive lighting and industrial illumination systems.
For engineers reviewing the LM3409MYX/NOPB datasheet, LM3409MYX/NOPB pinout, LM3409MYX/NOPB application, or LM3409MYX/NOPB equivalent, this device is selected for its no-compensation COFT architecture, 10,000:1 PWM dimming capability, thermally enhanced HVSSOP-10 package, and support for all-ceramic output capacitors in high-reliability LED driver designs.
Technical Context
The LM3409MYX/NOPB implements a Controlled Off-Time (COFT) hysteretic control architecture combining cycle-by-cycle peak current detection and voltage-dependent off-time timing. It uses polarity-swapped differential sensing to cancel comparator offset error and achieves accurate average LED current regulation without external loop compensation.
Its high-side current sense inputs (CSP/CSN) operate with ±0.3 V common-mode range relative to VIN, and the IADJ pin supports three configuration modes-open, voltage-biased, or resistor-grounded-to set the current threshold from 0 to 248 mV. The PGATE driver delivers 1-A peak sourcing/sinking into external P-FET gates with 2 Ω on-resistance.
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 regulators |
| Current Sense Threshold | 198 mV typical - sets LED current via external sense resistor; adjustable from 0 to 248 mV via IADJ pin |
| PGATE Drive Strength | 2 Ω typical - enables fast switching of external P-channel MOSFETs with ≤10 nF gate capacitance |
| PWM Dimming Range | 10,000:1 - allows precise brightness control down to 0.01% duty cycle without flicker |
| Thermal Package | HVSSOP-10 (3.0 mm × 3.0 mm) with exposed thermal pad - achieves 54.4°C/W junction-to-ambient thermal resistance |
| Shutdown Current | 110 µA - minimizes system standby power when EN < 0.5 V |
| UVLO Threshold | 1.243 V rising - configurable via resistor divider on UVLO pin for input brownout protection |
Pinout & Package
LM3409MYX/NOPB is housed in a thermally enhanced 10-pin HVSSOP package (3.00 mm × 3.00 mm) with an exposed DAP (Die Attach Pad) connected to GND for optimal heat dissipation. The package includes four to six vias recommended from DAP to internal ground plane.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 (UVLO) | Undervoltage lockout input | Resistor-divider node; 1.243 V turn-on threshold with 22 µA hysteresis current source |
| 2 (IADJ) | Current threshold adjust | Configures VCST from 0–248 mV via open circuit (1.24 V), external voltage, or resistor-to-GND |
| 3 (EN) | Enable / PWM dimming input | Logic-level interface: >1.74 V enables, <0.5 V shuts down, PWM signal dims LED current |
| 4 (COFF) | Off-time programming | Connects ROFF and COFF to set tOFF; timing depends on VO and parasitic 20 pF capacitance |
| 5 (GND) | Power and signal ground | Reference for all analog circuits; connects to DAP thermal pad via multiple vias |
| 6 (PGATE) | P-channel MOSFET gate driver | Drives external high-side PFET; 2 Ω typical output impedance, 1-A peak current capability |
| 7 (CSN) | Negative current sense input | Connects to low side of RSNS; ±0.3 V common-mode range relative to VIN |
| 8 (CSP) | Positive current sense input | Connects to high side of RSNS and VIN; enables differential sensing with offset cancellation |
| 9 (VCC) | Internal LDO output | 6 V ±0.5 V regulated supply for internal logic and gate drive; requires ≥1 µF ceramic capacitor to VIN |
| 10 (VIN) | Main power input | 6–42 V supply rail; powers internal regulator and provides reference for CSP/CSN common-mode range |
Key Features
| Feature | Design Value |
|---|---|
| No control loop compensation required | COFT architecture eliminates need for external compensation network, reducing BOM count and layout sensitivity |
| Differential high-side current sensing | Rejects common-mode noise and enables accurate current regulation even with high VIN and floating LED strings |
| 10,000:1 PWM dimming range | Supports high-contrast lighting control in automotive headlamps and architectural signage without visible flicker |
| Thermally enhanced HVSSOP-10 | Exposed DAP and optimized thermal path enable 5-A LED current operation at TJ ≤ 125°C in compact layouts |
| Cycle-by-cycle current limit | Hardware-based overcurrent protection prevents MOSFET failure during short-circuit or startup transients |
Applications
| Automotive Headlamp Drivers | Industrial High-Bay Lighting |
|---|---|
Use Scenario: Driving multi-LED arrays in adaptive front-lighting systems (AFS) with dynamic beam shaping. IC Role / Device Role / Timing Role: Constant-current buck controller regulating up to 5 A through series-connected LEDs while supporting 20 kHz PWM dimming. Use Value: Enables precise lumen output control across wide input voltage (9–16 V) and temperature ranges without feedback loop tuning. |
Use Scenario: Powering 40–100 W LED fixtures in warehouse and factory environments with 24–48 V DC distribution. IC Role / Device Role / Timing Role: Primary current regulator interfacing with 0–10 V analog dimming or microcontroller-driven PWM signals. Use Value: Delivers >90% efficiency at full load with all-ceramic output filtering, eliminating electrolytic capacitor reliability concerns. |
| Streetlight LED Modules | Medical Surgical Lighting |
Use Scenario: Outdoor LED luminaires operating from solar-charged 24 V battery banks with wide temperature swing (−40°C to +85°C). IC Role / Device Role / Timing Role: Robust current controller with UVLO hysteresis and thermal shutdown protecting against grid instability and ambient extremes. Use Value: Maintains ±5% LED current accuracy over temperature via polarity-swapped current sensing and COFT stability. |
Use Scenario: Critical illumination systems requiring flicker-free, stepless dimming and zero-output fault response. IC Role / Device Role / Timing Role: Safety-critical current source with fast EN pin disable (<21 ns delay) and cycle-by-cycle current limiting. Use Value: Meets IEC 60601-1 creepage/clearance requirements via HVSSOP isolation and enables fail-safe shutdown on command. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED buck controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM3409HVMYX/NOPB | 75 V max VIN vs 42 V; identical pinout and feature set | Suitable for 48 V telecom or 60 V EV auxiliary lighting where higher input transient tolerance is required | Select LM3409HVMYX/NOPB only if system VIN exceeds 42 V; otherwise LM3409MYX/NOPB offers lower cost and same performance |
| TPS92691QPWPRQ1 | Integrated N-channel driver, current sense amplifier, and analog/PWM dimming; 4.5–40 V VIN | Reduces external component count but lacks COFT simplicity and 10,000:1 PWM range | Choose TPS92691QPWPRQ1 for space-constrained designs needing integrated FET drive; retain LM3409MYX/NOPB for maximum flexibility and dimming fidelity |
Compared with LM3409HVMYX/NOPB and TPS92691QPWPRQ1, the LM3409MYX/NOPB delivers optimal trade-off between design simplicity (no compensation), dimming precision (10,000:1), and thermal performance in 42 V-class LED systems - making it preferred for cost-sensitive, high-reliability constant-current applications where external PFET selection is advantageous.
Availability
LM3409MYX/NOPB is available at Aetrix Electronics and suitable for automotive lighting, industrial high-bay fixtures, and outdoor streetlight systems requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant alternatives.
Supply support for LM3409MYX/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 delivering analog, embedded processing, and connectivity solutions with emphasis on reliability, energy efficiency, and system integration.
The LM3409MYX/NOPB belongs to TI's high-performance LED driver controller product line, designed specifically for robust, high-current constant-current regulation in automotive, industrial, and architectural lighting applications.
FAQ
What is the maximum LED current achievable with the LM3409MYX/NOPB?
The LM3409MYX/NOPB itself does not limit LED current-it is a controller. Maximum current depends on external components: MOSFET RDS(on), inductor saturation, sense resistor value, and thermal design. With appropriate layout and cooling, LM3409MYX/NOPB-based designs reliably deliver up to 5 A LED current, as confirmed in TI's application notes and evaluation boards using standard external PFETs and magnetics.
Does the LM3409MYX/NOPB require external compensation components?
No, the LM3409MYX/NOPB uses a Controlled Off-Time (COFT) architecture that inherently stabilizes the current loop without external compensation. This eliminates the need for op-amps, resistors, or capacitors in the feedback path-reducing bill-of-materials cost and simplifying PCB layout while maintaining stable regulation across input and output voltage variations.
How is analog dimming implemented on the LM3409MYX/NOPB?
Analog dimming is achieved by applying a 0–1.24 V voltage to the IADJ pin, which linearly scales the current sense threshold (VCST) from 0 to 248 mV. This directly adjusts the peak inductor current and thus the average LED current. The LM3409MYX/NOPB supports 250:1 analog dimming range, and the IADJ pin can also be left open (for max current) or terminated with a resistor to GND for fixed threshold setting.
What thermal considerations apply to the LM3409MYX/NOPB in continuous 5 A operation?
In continuous 5 A LED current operation, the LM3409MYX/NOPB requires proper thermal management: the exposed DAP must be soldered to a solid GND plane with 4–6 thermal vias, and board copper area should exceed 250 mm². At TA = 85°C, junction temperature remains within 125°C limit when RθJA is maintained near datasheet-specified 54.4°C/W-verified in TI's LM3409EVM-672 reference design.
Can the LM3409MYX/NOPB drive N-channel MOSFETs?
No-the LM3409MYX/NOPB is specifically designed as a P-channel high-side buck controller. Its PGATE output is referenced to VIN and drives the gate of external P-MOSFETs. Driving N-channel devices would require level-shifting circuitry not supported by the LM3409MYX/NOPB architecture; for N-FET buck controllers, TI recommends alternatives such as the LM3410 or TPS92515.
LM3409MYX/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:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-HVSSOP
LM3409MYX/NOPB FAQ
1.How can I place an order for LM3409MYX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3409MYX/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 LM3409MYX/NOPB reliable?
The price and inventory of LM3409MYX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM3409MYX/NOPB is usually 5 days.
3.What payment methods are accepted for LM3409MYX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3409MYX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3409MYX/NOPB?
LM3409MYX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3409MYX/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 LM3409MYX/NOPB?
For technical support, including LM3409MYX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3409MYX/NOPB requirements.
6.How does Aetrix verify that LM3409MYX/NOPB is sourced from the original manufacturer or authorized distributors?
All LM3409MYX/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 LM3409MYX/NOPB meets industry standards.
7.What is the process for return or replacement of LM3409MYX/NOPB?
All LM3409MYX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM3409MYX/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 LM3409MYX/NOPB part is unused and in its original packaging.
Return procedure for LM3409MYX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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