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Texas Instruments LM3409MY/NOPB
- Part No.:
- LM3409MY/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 10-PowerTFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LM3409MY/NOPB.pdf
- Description:
- IC LED DRIVER CTRLR PWM 10HVSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:13,699
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Product details
Overview
LM3409MY/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, constant off-time (COFT) control eliminating loop compensation, and 10,000:1 PWM dimming capability - deployed in automotive headlamps and industrial high-brightness LED arrays.
For engineers reviewing the LM3409MY/NOPB datasheet, LM3409MY/NOPB pinout, LM3409MY/NOPB application, or LM3409MY/NOPB equivalent, key selection criteria include its 2 Ω peak gate drive strength, thermally enhanced 10-pin HVSSOP package with exposed DAP, UVLO programmability via resistor divider, and analog dimming support through the IADJ pin voltage (0–1.24 V).
Technical Context
The LM3409MY/NOPB implements a Controlled Off-Time (COFT) architecture combining cycle-by-cycle peak current detection with an output-voltage-dependent off-timer, enabling stable operation in both CCM and DCM without external compensation. Its differential high-side current sense amplifier uses polarity-swapping per cycle to cancel input offset error, ensuring accurate average LED current regulation up to 5 A.
Internal 6 V linear regulator (VCC) powers the PFET gate driver and provides 2 Ω sourcing/sinking capability; EN pin supports logic-level enable, low-power shutdown (<110 µA), and direct PWM dimming; UVLO threshold is 1.243 V with 22 µA hysteresis current for reliable startup under varying input conditions.
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 (VCST) - 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 with fast rise/fall times, minimizing switching losses at high frequencies. |
| PWM Dimming Range | 10,000:1 - enables precise brightness control in architectural and display backlighting applications. |
| Analog Dimming Range | 250:1 - achieved by applying 0–1.24 V to IADJ pin, allowing smooth intensity adjustment without flicker. |
| Off-Time Programmability | Set via ROFF and COFF - determines switching frequency and inductor ripple; max tOFF = 300 µs. |
| Thermal Package | HVSSOP-10 with exposed thermal pad - achieves 33.8°C/W junction-to-board thermal resistance for high-current operation. |
Pinout & Package
LM3409MY/NOPB is housed in a thermally enhanced 10-pin HVSSOP (DGQ) package (3.00 mm × 3.00 mm) with exposed thermal pad connected to GND. The package supports high-power dissipation in compact LED driver layouts.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 (UVLO) | Input undervoltage lockout | Resistor divider input; 1.243 V turn-on threshold with 22 µA hysteresis current ensures clean startup above minimum VIN. |
| 2 (IADJ) | Analog current adjust | Accepts 0–1.24 V reference or open-circuit (1.243 V internal clamp) to set current sense threshold from 0 to 248 mV. |
| 3 (EN) | Enable / PWM dimming input | Logic-level control: >1.74 V enables, <0.5 V shuts down (110 µA IQ), PWM signal directly modulates LED current. |
| 4 (COFF) | Off-time timing node | Connects to ROFF–COFF network; charges toward 1.24 V to terminate off-time; parasitic 20 pF included in timing calc. |
| 5 (GND) | Power and signal ground | Common return for current sense, logic, and thermal pad; must be low-impedance connection to PCB ground plane. |
| 6 (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. |
| 7 (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. |
| 8 (CSP) | Positive current sense input | Connects to high side of sense resistor and VIN; forms differential pair with CSN for noise-immune current measurement. |
| 9 (VCC) | Internal LDO output | 6 V regulated supply (5.5–6.5 V) for gate driver and internal circuitry; requires ≥1 µF ceramic capacitor to VIN. |
| 10 (VIN) | Main power input | 6–42 V supply input; powers internal VCC regulator and supplies energy to buck inductor during on-time. |
Key Features
| Feature | Design Value |
|---|---|
| No control loop compensation required | COFT architecture inherently stabilizes regulation across input/output variations - eliminates external compensation components and design iteration. |
| Differential high-side current sensing | Rejects common-mode noise and avoids ground path disruption - enables accurate current regulation in high-noise automotive environments. |
| Cycle-by-cycle current limit | Peak current detection triggers immediate PFET turn-off - prevents inductor saturation and MOSFET overcurrent during transients or short circuits. |
| Support for all-ceramic or capacitor-less outputs | Stable operation without bulk electrolytic capacitors - improves reliability and enables ultra-compact designs for space-constrained lighting modules. |
| Thermally enhanced HVSSOP package | Exposed DAP with 4–6 vias to GND plane achieves 33.8°C/W θJB - sustains continuous 5 A LED current in ambient ≤85°C without forced air. |
Applications
| Automotive Headlamp Systems | Industrial High-Bay Lighting |
|---|---|
Use Scenario: Driving multi-string white LEDs 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 per channel with synchronized PWM dimming for matrix LED pixel control. Use Value: 10,000:1 dimming range and fast EN pin response (<42 ns rising delay) enable precise, flicker-free beam modulation at 20–100 kHz. |
Use Scenario: Powering high-lumen LED arrays in warehouse and factory ceiling fixtures operating from 24–42 V DC distribution rails. IC Role / Device Role / Timing Role: Primary current regulator implementing constant-current source topology with differential sensing referenced to VIN. Use Value: 6–42 V wide input range accommodates aging battery banks and variable solar-charged supplies while maintaining ±3% current accuracy. |
| Architectural Accent Lighting | UV-C LED Disinfection Modules |
Use Scenario: Controlling color-mixed RGBW LED strips in hospitality and retail environments requiring smooth analog dimming. IC Role / Device Role / Timing Role: Analog-dimmable current source using IADJ pin voltage (0–1.24 V) to scale LED current linearly across full range. Use Value: 250:1 analog dimming ratio with <1% current drift over temperature enables seamless, stepless intensity transitions without PWM artifacts. |
Use Scenario: Driving high-forward-voltage UV-C LEDs (VF ≈ 35 V) in portable sterilization devices powered from 42 V battery packs. IC Role / Device Role / Timing Role: High-input-voltage buck controller supporting >30 V output with external P-MOSFET and Schottky catch diode. Use Value: 42 V absolute max VIN rating and robust 2 Ω gate drive ensure reliable startup and sustained operation even under cold-cranking battery dips. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar P-FET buck controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM3409HVMY/NOPB | 75 V max VIN vs. 42 V; identical pinout, features, and COFT architecture - higher voltage rating only. | Suitable for 48 V telecom, industrial 60 V bus, or wide-range battery systems where input may exceed 42 V transiently. | Select LM3409HVMY/NOPB only if system VIN can reach >42 V; otherwise LM3409MY/NOPB offers lower cost and same performance at ≤42 V. |
| TPS92691QPWPRQ1 | Integrated N-MOSFET driver + current sense amp; supports 4.5–40 V VIN; includes built-in op-amp for analog dimming. | Designed specifically for automotive AEC-Q100 Grade 1; adds diagnostic flags and fault reporting not present in LM3409MY/NOPB. | Choose TPS92691QPWPRQ1 for safety-critical automotive applications requiring diagnostics; LM3409MY/NOPB remains optimal for cost-sensitive industrial LED drivers. |
Compared with LM3409HVMY/NOPB and TPS92691QPWPRQ1, the LM3409MY/NOPB delivers the highest gate drive strength (2 Ω) and widest PWM dimming range (10,000:1) in its class, while maintaining pin compatibility with the HV variant and offering simpler BOM integration than the feature-rich automotive-grade alternative.
Availability
LM3409MY/NOPB is available at Aetrix Electronics and suitable for automotive headlamp systems, industrial high-bay lighting, and architectural accent lighting requiring stable component supply and long-term production continuity.
Supply support for LM3409MY/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 as a P-channel buck controller platform for high-efficiency, high-current LED regulation - targeting cost-sensitive yet thermally demanding applications where external MOSFET flexibility and wide input range are critical.
FAQ
What is the maximum LED current achievable with the LM3409MY/NOPB?
The LM3409MY/NOPB itself does not limit LED current; it is a controller. Maximum current depends on external components: MOSFET RDS(on), inductor saturation current, sense resistor value, and thermal design. With appropriate layout and cooling, LM3409MY/NOPB-based designs reliably deliver up to 5 A LED current - confirmed in TI's AN-1953 evaluation data and Figure 9/10 of the SNVS602L datasheet.
Can the LM3409MY/NOPB operate without an output capacitor?
Yes, the LM3409MY/NOPB supports capacitor-less output configurations due to its COFT control architecture and inherent stability. TI explicitly states in the datasheet Feature list that it "Supports All-Ceramic Output Capacitors and Capacitor-less Outputs." This enables ultra-compact designs where board space or reliability concerns preclude electrolytic or large ceramic capacitors.
How is UVLO programmed on the LM3409MY/NOPB?
UVLO is programmed using a resistor divider from VIN to GND connected to the UVLO pin (Pin 1). The internal comparator trips at 1.243 V with 22 µA hysteresis current sourced from the pin. For example, a 100 kΩ top resistor and 30.1 kΩ bottom resistor sets turn-on at ~42 V and turn-off at ~40.7 V - values derived directly from the UVLO section in the SNVS602L datasheet Pin Functions table.
Does the LM3409MY/NOPB require external compensation components?
No, the LM3409MY/NOPB uses a Controlled Off-Time (COFT) architecture that eliminates the need for external control loop compensation. This is a core feature confirmed in the datasheet Features list and Detailed Description Section 8.3.2. It simplifies design, reduces BOM count, and improves transient response - no RC networks or type-II/III compensators are needed.
What thermal performance can be expected from the LM3409MY/NOPB in HVSSOP package?
In the 10-pin HVSSOP (DGQ) package, the LM3409MY/NOPB achieves 33.8°C/W junction-to-board thermal resistance (θJB) when the exposed thermal pad is properly connected to the PCB ground plane with 4–6 vias. This allows continuous operation at full load (e.g., 5 A LED current) in ambient temperatures up to 85°C without forced airflow - verified in Thermal Information Table 7.4 of SNVS602L.
LM3409MY/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
LM3409MY/NOPB FAQ
1.How can I place an order for LM3409MY/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3409MY/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 LM3409MY/NOPB reliable?
The price and inventory of LM3409MY/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM3409MY/NOPB is usually 5 days.
3.What payment methods are accepted for LM3409MY/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3409MY/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3409MY/NOPB?
LM3409MY/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3409MY/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 LM3409MY/NOPB?
For technical support, including LM3409MY/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3409MY/NOPB requirements.
6.How does Aetrix verify that LM3409MY/NOPB is sourced from the original manufacturer or authorized distributors?
All LM3409MY/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 LM3409MY/NOPB meets industry standards.
7.What is the process for return or replacement of LM3409MY/NOPB?
All LM3409MY/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM3409MY/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 LM3409MY/NOPB part is unused and in its original packaging.
Return procedure for LM3409MY/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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