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Texas Instruments LM3409QMY/NOPB
- Part No.:
- LM3409QMY/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 10-PowerTFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LM3409QMY/NOPB.pdf
- Description:
- IC LED DRIVER CTRLR PWM 10HVSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,594
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Product details
Overview
LM3409QMY/NOPB from Texas Instruments is a P-channel MOSFET buck controller for constant-current LED drivers, supporting 6 V to 42 V input, differential high-side current sensing with 198 mV typical threshold, 2 Ω peak gate drive, and 10,000:1 PWM dimming range - deployed in automotive headlamp and industrial high-brightness LED systems.
For engineers reviewing the LM3409QMY/NOPB datasheet, LM3409QMY/NOPB pinout, LM3409QMY/NOPB application, or LM3409QMY/NOPB equivalent, key selection criteria include its controlled off-time (COFT) architecture eliminating loop compensation, thermally enhanced HVSSOP-10 package with exposed DAP, and AEC-Q100 Grade 1 qualification for automotive lighting designs.
Technical Context
The LM3409QMY/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 differential high-side sensing across an external sense resistor to regulate LED current without requiring external compensation components.
Its EN pin serves dual function: logic-level enable (1.74 V threshold) and direct PWM dimming input; IADJ pin supports analog dimming via 0–1.24 V voltage or resistor-to-GND configuration; UVLO and thermal shutdown provide system-level protection. The device operates in both CCM and DCM with inherent current limiting.
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 (VCST) - enables precise high-side current regulation with low-loss RSNS selection. |
| Gate Drive Strength | 2 Ω sourcing/sinking - drives P-FET gates up to 1 A peak, minimizing switching losses in high-current LED strings. |
| PWM Dimming Range | 10,000:1 - achieves deep dimming down to 0.01% duty cycle without color shift in white LED arrays. |
| Analog Dimming Range | 250:1 - linear amplitude control via IADJ pin voltage (0–1.24 V), enabling smooth brightness transitions. |
| Package | HVSSOP-10 (3.0 mm × 3.0 mm) with exposed thermal pad - delivers 54.4°C/W junction-to-ambient thermal resistance for compact high-power layouts. |
| Shutdown Current | 110 µA - enables ultra-low power state during vehicle ignition-off or standby modes. |
Pinout & Package
LM3409QMY/NOPB is housed in a thermally enhanced 10-pin HVSSOP package (DGQ) with exposed thermal pad (DAP) connected to GND. The package measures 3.00 mm × 3.00 mm and features 0.5 mm pitch, optimized for high-current LED driver PCBs requiring efficient heat dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| UVLO | Input undervoltage lockout | Resistor divider input setting turn-on at 1.24 V; hysteresis provided by 22 µA internal current source. |
| VCC | VIN-referenced linear regulator output | Supplies gate drive and internal circuitry; requires ≥1 µF ceramic capacitor to VIN for stability. |
| VIN | Main power input | Accepts 6–42 V DC; powers internal regulator and supplies energy to external P-FET switch node. |
| EN | Enable / PWM dimming input | Logic-level control: >1.74 V enables operation; <0.5 V enters low-power shutdown; PWM signal directly modulates LED current. |
| COFF | Off-time programming | Connects external ROFF and COFF to set tOFF; timing depends on VO, enabling adaptive frequency control. |
| GND | System ground reference | Common return for current sense, regulator, and logic; must be tied to thermal pad vias for thermal performance. |
| PGATE | P-FET gate drive output | Drives external high-side P-channel MOSFET; 2 Ω drive strength supports fast turn-on/turn-off. |
| CSN | Negative current sense input | Connects to low side of external sense resistor; used with CSP for differential high-side sensing. |
| CSP | Positive current sense input | Connects to high side of sense resistor and VIN; enables accurate current measurement independent of load ground. |
| IADJ | Analog current adjust | Configurable threshold: open-circuit = 1.24 V; resistor-to-GND or 0–1.24 V voltage sets VCST from 0–248 mV. |
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 sensing | Rejects common-mode noise and ground bounce; enables accurate current regulation even with floating LED cathodes. |
| Thermally enhanced HVSSOP-10 package | Exposed DAP with 4–6 thermal vias to GND plane achieves 33.8°C/W junction-to-board resistance for sustained 5 A LED loads. |
| Cycle-by-cycle current limit | Hardware-based overcurrent protection triggers per switching cycle - prevents MOSFET failure during short-circuit or cold-start conditions. |
| Support for all-ceramic or capacitor-less outputs | Stable operation with low-ESR ceramic capacitors only; eliminates electrolytic bulk caps for longer lifetime in automotive environments. |
Applications
| Automotive Headlamps | Industrial High-Bay Lighting |
|---|---|
|
Use Scenario: Adaptive front-lighting system (AFS) with matrix LED arrays requiring precise current matching across 10+ channels. IC Role / Device Role / Timing Role: Constant-current buck controller regulating individual LED string currents up to 3.5 A with <±3% accuracy over temperature. Use Value: Enables pixel-level beam shaping without color shift, leveraging 10,000:1 PWM dimming and differential sensing immunity to chassis ground noise. |
Use Scenario: 150 W LED fixture for warehouse illumination operating from 24–42 V DC industrial bus. IC Role / Device Role / Timing Role: Primary current regulator controlling external P-FET to deliver stable 4.2 A to 36-V LED string under wide input variation. Use Value: Achieves >92% efficiency at full load with no loop compensation, reducing thermal stress and enabling fanless enclosure design. |
| Commercial Street Lighting | Emergency Exit Signage |
|
Use Scenario: Solar-powered LED streetlight with battery input varying from 10–32 V and ambient temperature range −40°C to +85°C. IC Role / Device Role / Timing Role: Input-voltage-robust buck controller maintaining constant LED current despite wide VIN swing and thermal drift. Use Value: Differential current sense and COFT architecture ensure ±4% current regulation across full temperature and input range without recalibration. |
Use Scenario: UL 924-compliant emergency egress sign with red/green LEDs requiring fail-safe dimming and low standby power. IC Role / Device Role / Timing Role: Dual-mode controller using EN pin for PWM dimming and IADJ for analog dimming during battery backup mode. Use Value: 110 µA shutdown current extends battery runtime; AEC-Q100 Grade 1 qualification ensures reliability in safety-critical applications. |
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 |
|---|---|---|---|
| LM3409HVQMY/NOPB | Wider 6–75 V VIN range; identical pinout and feature set. | Suitable for 48 V telecom or heavy-duty vehicle systems where input exceeds 42 V. | Select when input voltage may exceed 42 V; otherwise LM3409QMY/NOPB offers optimal cost/performance for 12/24 V platforms. |
| TPS92630QPWPRQ1 | Integrated 3-A P-FET switch; no external MOSFET required; 4.5–40 V VIN; I²C programmable. | Reduces component count for medium-current (<3 A) automotive interior lighting; adds digital configurability. | Choose for simplified layout and diagnostics in lower-current applications; LM3409QMY/NOPB retains flexibility for >3 A and custom FET selection. |
Compared with LM3409HVQMY/NOPB and TPS92630QPWPRQ1, LM3409QMY/NOPB provides the best balance of high-current capability (up to 5 A with external FET), minimal external components, and proven AEC-Q100 Grade 1 reliability in 12/24 V automotive LED systems.
Availability
LM3409QMY/NOPB is available at Aetrix Electronics and suitable for automotive lighting, industrial high-bay fixtures, and commercial solar-powered streetlights requiring stable component supply across extended temperature and voltage ranges.
Supply support for LM3409QMY/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 company specializing in analog and embedded processing technologies, with leadership in power management ICs and automotive-grade solutions.
LM3409QMY/NOPB belongs to TI's LED driver controller product line, designed specifically for high-reliability, high-efficiency constant-current buck regulation in automotive and industrial lighting applications.
FAQ
What is the maximum LED current achievable with the LM3409QMY/NOPB?
The LM3409QMY/NOPB is a controller-not a driver IC-so maximum LED current depends on external component selection. With appropriate P-FET, inductor, and sense resistor, it reliably regulates up to 5 A in continuous conduction mode. Key limiting factors are thermal management of the external FET and inductor saturation current, not internal current limits of the LM3409QMY/NOPB itself.
Does the LM3409QMY/NOPB require external compensation components?
No, the LM3409QMY/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 design complexity, board space, and tuning effort while improving transient response.
How does the LM3409QMY/NOPB implement analog dimming?
Analog dimming is implemented via the IADJ pin: applying 0–1.24 V adjusts the current sense threshold (VCST) from 0–248 mV, directly scaling LED current proportionally. Alternatively, leaving IADJ open sets VCST to 248 mV (full scale); connecting a resistor to GND sets VCST based on 5 µA internal current source and REXT value.
Is the LM3409QMY/NOPB pin-compatible with other devices in the LM3409 family?
Yes, LM3409QMY/NOPB shares identical pinout and functionality with LM3409, LM3409-Q1, and LM3409HV-Q1 in the HVSSOP-10 (DGQ) package. However, LM3409HV variants support higher 6–75 V input and are not electrically interchangeable in 42 V-max systems without validation.
What thermal design considerations apply to the LM3409QMY/NOPB HVSSOP package?
The LM3409QMY/NOPB HVSSOP package includes an exposed thermal pad (DAP) that must be soldered to a GND plane with 4–6 thermal vias. TI specifies 33.8°C/W junction-to-board thermal resistance when properly implemented - critical for sustaining 5 A LED loads at 125°C junction temperature. Layout must avoid thermal isolation of the DAP.
LM3409QMY/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
LM3409QMY/NOPB FAQ
1.How can I place an order for LM3409QMY/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3409QMY/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 LM3409QMY/NOPB reliable?
The price and inventory of LM3409QMY/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM3409QMY/NOPB is usually 5 days.
3.What payment methods are accepted for LM3409QMY/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3409QMY/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3409QMY/NOPB?
LM3409QMY/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3409QMY/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 LM3409QMY/NOPB?
For technical support, including LM3409QMY/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3409QMY/NOPB requirements.
6.How does Aetrix verify that LM3409QMY/NOPB is sourced from the original manufacturer or authorized distributors?
All LM3409QMY/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 LM3409QMY/NOPB meets industry standards.
7.What is the process for return or replacement of LM3409QMY/NOPB?
All LM3409QMY/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM3409QMY/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 LM3409QMY/NOPB part is unused and in its original packaging.
Return procedure for LM3409QMY/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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