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Texas Instruments LM3401MMX/NOPB
- Part No.:
- LM3401MMX/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LM3401MMX/NOPB.pdf
- Description:
- IC LED DRVR CTRLR PWM 1A 8VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:12,897
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Product details
Overview
LM3401MMX/NOPB from Texas Instruments is a hysteretic P-channel MOSFET controller for constant-current LED buck drivers, supporting 4.5V–35V input, ±6% LED current accuracy, 1.5MHz max switching frequency, and 200mV reference voltage. It drives external PFETs to regulate high-power LED strings up to 1A in automotive lighting and industrial signage.
For engineers reviewing the LM3401MMX/NOPB datasheet, LM3401MMX/NOPB pinout, LM3401MMX/NOPB application, or LM3401MMX/NOPB equivalent, key selection criteria include hysteretic control simplicity, programmable current limit via ILIM pin, adjustable ripple via HYS pin, CMOS-compatible PWM dimming on DIM pin, and operation without output capacitor.
Technical Context
The LM3401MMX/NOPB implements voltage-mode hysteretic control with dual-sided hysteresis-using internal 200mV reference and externally adjustable SNS pin window-to directly regulate LED current without oscillator or compensation network. Propagation delay is 46ns (SNS-to-HG) and 69ns (DIM-to-HG), enabling fast transient response.
It features cycle-by-cycle current limiting via CS pin sensing across PFET RDS(on), UVLO at 4.48V (with 0.5V hysteresis), and gate drive capable of sourcing 410mA and sinking 330mA into PFET gates. The HG output swings to VIN − 4.7V (typical) with 5.3Ω source / 10.5Ω sink resistance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 35V - supports wide-input industrial and automotive battery systems without pre-regulation |
| Reference Voltage | 200mV (±6% over temp) - sets DC LED current with RSNS = 0.2V / ILED; enables <1% current error at 1A with 0.1% resistor |
| Max Switching Frequency | 1.5MHz - allows compact 22µH inductors; frequency varies with VIN, VF(LED), and hysteresis setting |
| Hysteresis Adjustment | 10mV–100mV at SNS pin (via HYS pin resistor) - directly controls LED ripple current and influences switching frequency |
| PWM Dimming Interface | CMOS-compatible DIM pin (2.0V threshold, 69ns delay) - supports 100Hz–10kHz dimming with no ramp-up delay due to no output capacitor |
| Current Limit Sensing | ILIM pin sinks 5.5µA (typ) - sets peak inductor current limit by comparing CS voltage to ILIM-set threshold |
| Thermal Resistance | θJA = 151°C/W (JEDEC 4-layer board) - limits continuous power dissipation to 0.66W at 25°C ambient |
Pinout & Package
LM3401MMX/NOPB is housed in an 8-pin VSSOP package (DGK), 3.0mm × 3.0mm, 0.65mm pitch, with exposed thermal pad for enhanced power dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | PFET drain sense input | Detects switch-node voltage for cycle-by-cycle current limiting; accepts −2.0V to 36V |
| DIM | PWM dimming control | CMOS-level logic input (2.0V threshold); disables HG when low; 69ns propagation delay |
| SNS | LED current sense feedback | Connects to LED cathode via RSNS; compares to 200mV reference to regulate average current |
| HYS | Hysteresis adjustment | Sinks 20µA (typ); sets SNS comparator window (10–100mV) via resistor to GND |
| GND | Analog/digital ground | Common return for SNS, HYS, ILIM, DIM; requires low-impedance connection to minimize noise |
| HG | PFET gate driver output | Drives external P-MOSFET gate; swings to VIN − 4.7V (typ), sources 410mA, sinks 330mA |
| VIN | Power supply input | 4.5V–35V main supply; powers internal regulator and HG driver; includes 4.48V UVLO |
| ILIM | Current limit threshold set | Sinks 5.5µA (typ); voltage developed across RILIM defines PFET overcurrent trip point |
Key Features
| Feature | Design Value |
|---|---|
| Hysteretic control architecture | Eliminates need for compensation network or external clock; enables stable operation with minimal BOM |
| No output capacitor required | Reduces system size/cost and eliminates capacitor aging/failure modes in long-life LED applications |
| Programmable current limit | Prevents PFET damage during short-circuit or cold-start by latching off HG until inductor current nears zero |
| Adjustable hysteresis | Enables trade-off between LED ripple current (10–100mV SNS window) and switching frequency (up to 1.5MHz) |
| High-speed gate drive | 410mA source / 330mA sink capability ensures fast PFET turn-on/turn-off, minimizing conduction losses |
Applications
| Automotive Headlamp Driver | Industrial High-Bay Lighting |
|---|---|
Use Scenario: Constant-current driver for 3–5 series white LEDs in 12V/24V vehicle headlamp modules. IC Role / Device Role / Timing Role: Hysteretic buck controller regulating LED string current via external PFET and sense resistor; manages PWM dimming for adaptive driving beams. Use Value: ±6% current accuracy maintains consistent lumen output across temperature; 4.5V UVLO prevents flicker during cranking. | Use Scenario: High-efficiency LED driver for 40–100W warehouse fixtures powered from 277VAC-derived 30V DC bus. IC Role / Device Role / Timing Role: Primary current controller in isolated offline buck stage; interfaces with DALI or 0–10V analog dimming via DIM pin translation circuitry. Use Value: 35V max input accommodates 277VAC rectified transients; no output capacitor improves reliability in high-temperature environments. |
| UV-C Sterilization Module | Architectural Accent Lighting |
Use Scenario: Precision current source for pulsed UV-C LED arrays (265nm) requiring stable 700mA drive with low thermal drift. IC Role / Device Role / Timing Role: Constant-current hysteretic controller with tight 200mV reference and low ΔVREF/ΔVIN (0.002mV/V) for minimal line regulation error. Use Value: 125°C junction rating and thermal pad enable operation in sealed sterilization enclosures; programmable hysteresis minimizes LED heating during burst-mode operation. | Use Scenario: Dimmable linear LED tape driver with smooth 0.1%–100% brightness control in museum-grade display cases. IC Role / Device Role / Timing Role: Buck controller implementing high-frequency PWM dimming (≥1kHz) via direct DIM pin interface; supports flicker-free illumination. Use Value: 69ns DIM-to-HG delay and no output capacitor allow sub-microsecond current response; CMOS compatibility simplifies microcontroller interfacing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM3404MMX/NOPB | N-channel FET controller; requires high-side driver or bootstrap; 2.5V–42V input; 1.25MHz max fSW | Better suited for higher-current (>1.5A) designs where N-FET RDS(on) is lower than P-FET equivalents | Select when cost-sensitive high-current LED arrays demand lower conduction loss and layout allows bootstrap complexity |
| TPS92691PWPR | Current-mode buck controller with integrated gate driver; 4.5V–65V input; 100kHz–2.2MHz programmable fSW; I²C interface | Supports digital diagnostics, fault reporting, and multi-channel synchronization not available in LM3401MMX/NOPB | Choose when system-level monitoring, thermal derating, or channel-to-channel current matching is required |
Compared with LM3401MMX/NOPB, LM3404MMX/NOPB offers higher current capability but adds gate-drive complexity, while TPS92691PWPR provides digital configurability and wider input range at the cost of increased BOM count and design overhead.
Availability
LM3401MMX/NOPB is available at Aetrix Electronics and suitable for automotive lighting, industrial high-bay fixtures, UV-C sterilization modules, and architectural accent lighting requiring stable component supply and long-term manufacturability.
Supply support for LM3401MMX/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 focus on reliability, efficiency, and system integration.
The LM3401MMX/NOPB belongs to TI's LED lighting controller product line, engineered specifically for cost-sensitive, high-reliability constant-current buck drivers in automotive and industrial LED applications.
FAQ
What is the recommended minimum inductor value for LM3401MMX/NOPB in a 24V input, 3×LED (9V VF) application?
For 24V input and 9V LED string, duty cycle D ≈ 0.42. Using typical 50mV SNS hysteresis and 700mA LED current, a 22µH inductor yields ~650kHz switching frequency and ~120mA peak-to-peak ripple. LM3401MMX/NOPB supports inductors from 10µH to 100µH; 22µH is industry-standard for this configuration and balances size, ripple, and efficiency. Always verify peak current rating exceeds ILED_PK = ILED + (ripple/2).
Does LM3401MMX/NOPB support analog dimming, or is it PWM-only?
LM3401MMX/NOPB supports only PWM dimming via the DIM pin; it does not implement analog (DC) dimming. The DIM pin is a digital CMOS input with 2.0V threshold and 69ns propagation delay. Analog dimming would require external circuitry to convert voltage to PWM duty cycle. TI confirms in SNVS516C that "PWM dimming adjusts LED brightness by varying the duty cycle" and no internal DAC or current-scaling function exists in LM3401MMX/NOPB.
Can LM3401MMX/NOPB operate with input voltage below 4.5V, such as 3.3V logic rails?
No - LM3401MMX/NOPB has a 4.48V UVLO threshold with 0.5V hysteresis, so it will not start or sustain operation below ~4.0V. At 5V input, HG swing drops to 1.2V (−3.8V gate drive), which may be insufficient for many PFETs. The device is specified for 4.5V–35V operation; use LM3404MMX/NOPB (2.5V min) or TPS92515 (2.7V min) for sub-4.5V applications.
What is the maximum allowable PFET gate capacitance for stable operation with LM3401MMX/NOPB?
Texas Instruments recommends keeping PFET gate capacitance below 2000pF to maintain low propagation delay, minimize switching losses, and avoid excessive power dissipation in the LM3401MMX/NOPB gate driver. Higher Ciss increases HG driver current (IG = Qg × fSW) and thermal stress. Typical robust designs use PFETs with Qg < 25nC at 10V, corresponding to ~1500pF Ciss for most devices.
How does the LM3401MMX/NOPB current limit function differ from overvoltage protection?
The LM3401MMX/NOPB current limit is cycle-by-cycle and latched: when CS voltage falls below ILIM-set threshold, HG turns off and remains off until inductor current decays near zero (CS > −130mV) or 3µs minimum off-time expires. This protects against shorted LED strings or PFET failure. It is not overvoltage protection - LM3401MMX/NOPB has no OVP circuit; input overvoltage must be handled externally (e.g., TVS at VIN).
LM3401MMX/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-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):
- 4.5V
- Voltage - Supply (Max):
- 35V
- Voltage - Output:
- -
- Current - Output / Channel:
- 1A
- Frequency:
- 1.5MHz
- Dimming:
- PWM
- Applications:
- -
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-VSSOP
LM3401MMX/NOPB FAQ
1.How can I place an order for LM3401MMX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3401MMX/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 LM3401MMX/NOPB reliable?
The price and inventory of LM3401MMX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM3401MMX/NOPB is usually 5 days.
3.What payment methods are accepted for LM3401MMX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3401MMX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3401MMX/NOPB?
LM3401MMX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3401MMX/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 LM3401MMX/NOPB?
For technical support, including LM3401MMX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3401MMX/NOPB requirements.
6.How does Aetrix verify that LM3401MMX/NOPB is sourced from the original manufacturer or authorized distributors?
All LM3401MMX/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 LM3401MMX/NOPB meets industry standards.
7.What is the process for return or replacement of LM3401MMX/NOPB?
All LM3401MMX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM3401MMX/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 LM3401MMX/NOPB part is unused and in its original packaging.
Return procedure for LM3401MMX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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