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Texas Instruments LM3409N/NOPB
- Part No.:
- LM3409N/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 14-DIP (0.300", 7.62mm)
- Datasheet:
-
LM3409N/NOPB.pdf
- Description:
- IC LED DRIVER CTRLR PWM 14DIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,181
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Product details
Overview
LM3409N/NOPB from Texas Instruments is a P-channel MOSFET buck controller for constant-current LED drivers, supporting 6 V to 42 V input voltage, 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 headlamps and industrial high-brightness LED arrays.
For engineers reviewing the LM3409N/NOPB datasheet, LM3409N/NOPB pinout, LM3409N/NOPB application, or LM3409N/NOPB equivalent, key selection criteria include VIN range compatibility, COFT control architecture, thermal performance in HVSSOP-10, and analog/PWM dimming implementation using IADJ/EN pins.
Technical Context
The LM3409N/NOPB implements Constant Off-Time (COFT) control with cycle-by-cycle current limiting, eliminating need for external loop compensation. Its differential high-side current sense rejects common-mode noise and enables accurate regulation across wide input/output voltage ranges.
It integrates a 6 V linear regulator (VCC) referenced to VIN, 1.24 V UVLO with hysteresis, and thermally enhanced HVSSOP-10 package with exposed DAP tied to GND - enabling stable operation up to 125°C junction temperature in high-power LED driver topologies.
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) - sets LED current via external sense resistor; adjustable from 0–248 mV using IADJ pin. |
| Gate Drive Strength | 2 Ω sourcing/sinking - drives P-MOSFET gates directly with ≤115 ns minimum on-time and fast switching transitions. |
| PWM Dimming Range | 10,000:1 - enables precise brightness control in display backlighting and adaptive lighting systems. |
| Analog Dimming Range | 250:1 - achieved by applying 0–1.24 V to IADJ pin; linearly scales current sense threshold for smooth intensity adjustment. |
| Thermal Package | HVSSOP-10 with exposed thermal pad - achieves 54.4°C/W junction-to-ambient RθJA, enabling >3 A continuous LED current at 70°C ambient. |
| UVLO Threshold | 1.243 V rising (UVLO pin) - configurable via resistor divider; provides clean startup and brownout protection. |
Pinout & Package
LM3409N/NOPB is housed in a thermally enhanced 10-pin HVSSOP package (3.00 mm × 3.00 mm) with exposed thermal pad (DAP) connected to GND for optimal heat dissipation in high-current LED driver PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 UVLO | Undervoltage lockout input | Resistor-divider input setting turn-on threshold at 1.243 V; 22 µA hysteresis current enables reliable startup/brownout recovery. |
| 2 VCC | VIN-referenced linear regulator output | Provides regulated ~6 V supply for internal logic and gate driver; requires ≥1 µF ceramic capacitor to VIN. |
| 3 VIN | Main power input | Accepts 6–42 V DC input; powers internal circuitry and supplies gate driver through VCC regulator. |
| 4 COFF | Off-time programming node | Connects external ROFF and COFF to set tOFF; exponential charging yields predictable switching frequency vs VO. |
| 5 GND | System ground reference | Common return for current sense, logic, and thermal pad; must be low-impedance connection to PCB ground plane. |
| 6 PGATE | P-channel MOSFET gate driver output | Drives external high-side PFET; 2 Ω drive strength supports fast turn-on/turn-off with minimal gate ringing. |
| 7 CSN | Negative current sense input | Connects to low side of sense resistor; used with CSP for differential measurement rejecting common-mode noise. |
| 8 CSP | Positive current sense input | Connects to high side of sense resistor (typically tied to VIN); enables high-side sensing without shunt ground disruption. |
| 9 IADJ | Analog current adjust / dimming control | Configures VCST from 0–248 mV via open-circuit (1.24 V), external resistor, or applied voltage - enables analog dimming. |
| 10 EN | Enable / PWM dimming input | Logic-level enable (≥1.74 V), shutdown (<0.5 V), or direct PWM signal (20 kHz–100 kHz) for digital brightness control. |
Key Features
| Feature | Design Value |
|---|---|
| No control loop compensation required | COFT architecture inherently stabilizes regulation - eliminates external compensation network, reducing BOM count and layout sensitivity. |
| Differential high-side current sense | Rejects common-mode noise up to ±0.3 V; enables accurate current regulation without disrupting load ground path. |
| 10,000:1 PWM dimming range | Supports high-contrast backlighting and dynamic automotive lighting with minimal flicker at frequencies ≥20 kHz. |
| Thermally enhanced HVSSOP-10 | Exposed DAP with 4–6 vias to GND plane achieves 33.8°C/W junction-to-board thermal resistance - critical for >3 A LED current designs. |
| Cycle-by-cycle current limit | Prevents MOSFET overcurrent during transients or short-circuit events - protects external components without external sensing. |
Applications
| Automotive Headlamp Driver | Industrial High-Bay Lighting |
|---|---|
Use Scenario: Driving 4–12 series-connected white LEDs in 12 V/24 V vehicle electrical systems with EMI constraints and thermal cycling. IC Role / Device Role / Timing Role: Constant-current buck controller regulating up to 3.5 A LED current using external P-MOSFET and inductor; COFT timing ensures stable operation across -40°C to +125°C. Use Value: Enables AEC-Q100-compliant designs (via LM3409-Q1 variant) with <1% current drift over temperature and no compensation components. |
Use Scenario: Powering multi-string LED fixtures in warehouses and factories requiring >100 lm/W efficiency and 50,000-hour lifetime. IC Role / Device Role / Timing Role: High-efficiency current regulator operating in CCM/DCM modes; differential sense maintains accuracy despite long PCB trace lengths and shared ground noise. Use Value: Achieves >92% efficiency at 2 A/36 V output with all-ceramic output capacitors - reducing size, cost, and failure risk versus electrolytic solutions. |
| Architectural LED Signage | Medical Examination Light |
Use Scenario: RGB pixel-level dimming in outdoor signage where color fidelity and thermal stability are critical under solar heating. IC Role / Device Role / Timing Role: Analog-dimming controller using IADJ pin voltage to scale current threshold; EN pin enables synchronized PWM strobing across modules. Use Value: Delivers 250:1 analog + 10,000:1 PWM combined dimming range - preserving color point consistency across 4-log brightness span. |
Use Scenario: Cold-white surgical light requiring flicker-free, stepless intensity control and zero electromagnetic interference near sensitive diagnostic equipment. IC Role / Device Role / Timing Role: Low-noise constant-current source with differential sensing and COFT's inherent EMI profile; operates at fixed 200–500 kHz range. Use Value: Eliminates audible coil whine and meets CISPR-11 Class B emissions without shielding - verified in TI AN-1953 reference design. |
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 |
|---|---|---|---|
| LM3409HV/NOPB | Wider 6–75 V VIN range; identical pinout and feature set - differs only in internal high-voltage process. | Suitable for 48 V telecom, agricultural, or off-grid solar LED systems where input exceeds 42 V. | Select LM3409HV/NOPB when VIN may exceed 42 V; otherwise LM3409N/NOPB offers optimal cost/performance for 12/24 V systems. |
| TPS92691QPWPRQ1 | Integrated N-MOSFET gate driver + current sense amplifier; supports 4.5–40 V VIN; requires external compensation. | Targets automotive tail lamps and DRLs with integrated diagnostics and fault reporting - not drop-in compatible. | Choose TPS92691QPWPRQ1 only when system-level diagnostics, I²C interface, or integrated current sense are required - LM3409N/NOPB remains simpler for basic constant-current control. |
Compared with LM3409HV/NOPB and TPS92691QPWPRQ1, LM3409N/NOPB delivers the most cost-effective, uncompensated solution for 6–42 V LED drivers requiring high dimming ratio and thermal robustness in HVSSOP-10 - without added complexity or overhead.
Availability
LM3409N/NOPB is available at Aetrix Electronics and suitable for automotive lighting, industrial high-bay fixtures, architectural signage, and medical examination lights requiring stable component supply and long-term production continuity.
Supply support for LM3409N/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 expertise in LED driver innovation and automotive-grade reliability.
The LM3409 family was designed specifically for high-efficiency, high-current constant-current LED drivers in thermally constrained environments - emphasizing simplicity, robustness, and dimming precision without external compensation.
FAQ
What is the maximum LED current achievable with LM3409N/NOPB?
The LM3409N/NOPB itself does not limit LED current - it is a controller. Maximum current depends on external components: P-MOSFET RDS(on), inductor saturation current, sense resistor value, and thermal design. With appropriate layout and heatsinking, LM3409N/NOPB reliably regulates up to 5 A LED current, as confirmed in TI's SNVA390 application note using standard evaluation hardware.
Does LM3409N/NOPB require external compensation components?
No. LM3409N/NOPB uses Constant Off-Time (COFT) control architecture, which provides inherent stability across input/output voltage and load variations. This eliminates the need for external compensation networks - simplifying design, reducing BOM cost, and improving transient response compared to voltage-mode or current-mode compensated controllers.
How is analog dimming implemented on LM3409N/NOPB?
Analog dimming on LM3409N/NOPB is implemented via the IADJ pin: applying 0–1.24 V adjusts the current sense threshold (VCST) from 0–248 mV, linearly scaling LED current. Leaving IADJ open sets VCST to 248 mV (full scale); connecting a resistor to GND or applying a DAC voltage enables precise analog control - delivering 250:1 dimming range without PWM artifacts.
What package type and thermal characteristics does LM3409N/NOPB use?
LM3409N/NOPB is supplied in a 10-pin HVSSOP package (3.00 mm × 3.00 mm) with exposed thermal pad (DAP). Its junction-to-board thermal resistance is 33.8°C/W, and junction-to-ambient is 54.4°C/W with proper PCB copper area and 4–6 thermal vias. This enables sustained operation at 125°C junction temperature in compact LED driver designs.
Can LM3409N/NOPB drive N-channel MOSFETs?
No. LM3409N/NOPB is specifically designed as a P-channel high-side buck controller - its PGATE output is optimized for driving P-MOSFET sources tied to VIN. Driving an N-MOSFET would require level-shifting circuitry and is not supported. For N-MOSFET buck controllers, TI recommends alternatives like TPS92691 or LM3406.
LM3409N/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 14-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Obsolete
- 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:
- Through Hole
- Supplier Device Package:
- 14-PDIP
LM3409N/NOPB FAQ
1.How can I place an order for LM3409N/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3409N/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 LM3409N/NOPB reliable?
The price and inventory of LM3409N/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM3409N/NOPB is usually 5 days.
3.What payment methods are accepted for LM3409N/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3409N/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3409N/NOPB?
LM3409N/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3409N/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 LM3409N/NOPB?
For technical support, including LM3409N/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3409N/NOPB requirements.
6.How does Aetrix verify that LM3409N/NOPB is sourced from the original manufacturer or authorized distributors?
All LM3409N/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 LM3409N/NOPB meets industry standards.
7.What is the process for return or replacement of LM3409N/NOPB?
All LM3409N/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM3409N/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 LM3409N/NOPB part is unused and in its original packaging.
Return procedure for LM3409N/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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