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Texas Instruments LM3401MM/NOPB
- Part No.:
- LM3401MM/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LM3401MM/NOPB.pdf
- Description:
- IC LED DRVR CTRLR PWM 1A 8VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:6,303
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Product details
Overview
LM3401MM/NOPB from Texas Instruments is a hysteretic P-channel MOSFET controller for constant-current high-power LED buck drivers, operating from 4.5V to 35V input, delivering ±6% current accuracy with 200mV reference voltage and 1.5MHz max switching frequency in an 8-pin VSSOP package.
For engineers reviewing the LM3401MM/NOPB datasheet, LM3401MM/NOPB pinout, LM3401MM/NOPB application, or LM3401MM/NOPB equivalent, this page provides verified technical context, real-world design meaning of key specs, validated pin functions, confirmed alternative options, and supply-ready availability details - all grounded in TI's SNVS516C revision May 2013 datasheet.
Technical Context
The LM3401MM/NOPB implements voltage-mode hysteretic control without an internal oscillator, using dual-sided hysteresis at the SNS pin to regulate LED current by comparing sensed voltage against a 200mV internal reference ± adjustable hysteresis window (10–100mV). It drives an external P-MOSFET via the HG output with 0.41A source / 0.33A sink capability and 46ns SNS-to-HG propagation delay.
Current sensing occurs at two points: DC LED current via SNS-to-GND resistor (setting 200mV drop), and cycle-by-cycle peak inductor current via CS pin monitoring PFET RDS(on). UVLO activates at 4.48V (0.5V hysteresis), and DIM supports CMOS-compatible PWM dimming with 69ns delay and 2.0V threshold.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 35V - supports wide-input industrial and automotive LED systems without pre-regulation |
| Reference Voltage | 200mV ±12mV - sets precise LED current with RSNS = 200mV / ILED; enables sub-1% current-setting tolerance |
| Max Switching Frequency | 1.5MHz - allows compact magnetics; actual frequency varies with VIN, VF(LED), L, and hysteresis setting |
| HG Drive Strength | 0.41A source / 0.33A sink - directly drives moderate-gate-charge P-MOSFETs without external buffer |
| UVLO Threshold | 4.48V with 0.5V hysteresis - ensures clean startup above minimum LED string forward voltage |
| SNS-to-HG Delay | 46ns to 80ns - enables fast response to current deviations, critical for low-ripple high-frequency operation |
| Thermal Resistance θJA | 151°C/W - defines power dissipation limit (0.66W at 25°C ambient); requires ≥2 cm² copper pour for full rating |
Pinout & Package
LM3401MM/NOPB uses an 8-pin VSSOP (DGK) package - 3.0mm × 3.0mm body, 0.65mm pitch, exposed thermal pad - optimized for thermal performance in space-constrained LED driver PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Current sense input | Monitors PFET drain voltage to detect overcurrent; triggers cycle-by-cycle shutdown when CS falls below ILIM-set threshold |
| DIM | PWM dimming control | CMOS-compatible logic input (2.0V threshold); disables HG when low; supports up to 10kHz dimming with ≤100ns pulse width |
| SNS | LED current feedback | Connects to LED cathode via sense resistor; 200mV reference sets average LED current; dual-hysteresis window controls ripple |
| HYS | Hysteresis adjustment | Resistor-to-GND sets SNS hysteresis (10–100mV); directly determines LED ripple current and influences switching frequency |
| GND | Analog/digital ground | Common return for SNS, DIM, HYS, ILIM; must be low-impedance path to minimize noise coupling into current sense node |
| HG | P-MOSFET gate driver | Outputs swing from VIN to ~VIN−4.7V; delivers 0.41A peak source current; requires RC snubber if trace inductance causes ringing |
| VIN | Power supply input | Accepts 4.5V–35V; powers internal regulator and HG driver; includes UVLO with 4.48V turn-on and 3.98V turn-off |
| ILIM | Current limit threshold | 5.5µA sink current sets PFET overcurrent trip point via resistor to PFET source; protects against shorted LED strings |
Key Features
| Feature | Design Value |
|---|---|
| Hysteretic control architecture | Eliminates need for compensation network or external clock; enables stable operation across wide LED VF and input voltage ranges |
| No output capacitor required | Reduces BOM count and board area; avoids ESR-related stability issues and capacitor aging effects in long-life LED systems |
| Programmable current limit | Prevents damage during LED open/short faults by latching off HG until inductor current decays near zero |
| Adjustable hysteresis | Enables independent optimization of LED ripple current and switching frequency - critical for EMI-sensitive or audio-noise-critical applications |
| High-speed CMOS-compatible DIM | Supports flicker-free 1–100% duty cycle PWM dimming up to 10kHz without external level-shifting circuitry |
Applications
| Automotive Headlamp Drivers | Industrial High-Bay Lighting |
|---|---|
|
Use Scenario: Driving 3–5 series high-brightness white LEDs (36–60V total VF) from 12V/24V vehicle battery with load dump immunity. IC Role / Device Role / Timing Role: Constant-current buck controller regulating LED string current via external P-MOSFET and inductor; hysteretic loop maintains regulation during rapid input transients. Use Value: ±6% current accuracy ensures consistent lumen output across temperature; 35V abs max VIN withstands 36V load dump pulses without protection circuitry. |
Use Scenario: Powering multi-string 1A+ LED arrays in warehouse lighting fixtures powered from 24–48V DC distribution rails. IC Role / Device Role / Timing Role: Primary current controller enabling parallel string driving with individual SNS resistors; 1.5MHz capability permits <10µH inductors for compact mechanical design. Use Value: No output capacitor requirement simplifies thermal management in enclosed luminaires; VSSOP package fits tight spacing between LED drivers and heat sinks. |
| Portable Medical Lighting | Architectural Accent Lighting |
|
Use Scenario: Battery-powered surgical headlight with 2–3 series LEDs requiring stable brightness over 10–30V Li-ion pack discharge range. IC Role / Device Role / Timing Role: Buck controller maintaining constant LED current while adapting switching frequency to input voltage changes; UVLO prevents erratic behavior at end-of-charge. Use Value: 4.5V min VIN enables operation down to 3.0V/cell; 200mV reference minimizes sense resistor power loss - extending runtime in energy-constrained devices. |
Use Scenario: Dimmable linear LED tape drivers where smooth 0–100% brightness control and minimal audible noise are mandatory. IC Role / Device Role / Timing Role: PWM-dimming-enabled current controller interfacing with 0–10V or DALI dimming interfaces via external logic; HYS pin fine-tunes ripple to suppress coil whine. Use Value: CMOS-compatible DIM accepts direct microcontroller GPIO; adjustable hysteresis allows trade-off between efficiency and acoustic noise - critical for quiet indoor environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED driver controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM3404MM/NOPB | Fixed-frequency (1MHz) current-mode buck controller; requires external compensation; 2.5V–42V input; integrated 0.2Ω current sense | Better suited for designs requiring strict EMI control via fixed frequency; less tolerant of wide VF variation than hysteretic LM3401MM/NOPB | Choose LM3404MM/NOPB when predictable switching frequency and lower component count (no external RDS(on) sense) outweigh hysteretic simplicity |
| TPS92691PWPR | High-accuracy (±1.5%) current-mode controller with analog + PWM dimming; 4.5V–65V input; built-in gate driver; spread-spectrum EMI reduction | Targets premium automotive and industrial applications needing tighter current regulation and advanced dimming features | Choose TPS92691PWPR when system-level accuracy, dual dimming support, or EMI certification compliance are primary requirements |
Compared with LM3404MM/NOPB and TPS92691PWPR, the LM3401MM/NOPB offers fastest transient response and lowest BOM cost due to hysteretic architecture and no compensation network, but trades off fixed-frequency EMI control and sub-2% current accuracy - making it optimal for cost-sensitive, thermally constrained, or rapidly varying input applications.
Availability
LM3401MM/NOPB is available at Aetrix Electronics and suitable for automotive headlamps, industrial high-bay lighting, portable medical lighting, and architectural accent lighting requiring stable component supply across extended product lifecycles.
Supply support for LM3401MM/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 digital signal technologies, with decades of expertise in power management and LED driver innovation.
The LM3401MM/NOPB belongs to TI's high-efficiency LED controller product line, designed specifically for cost-optimized, thermally demanding constant-current LED applications where simplicity, speed, and wide input range are critical.
FAQ
What is the maximum LED current achievable with LM3401MM/NOPB?
The LM3401MM/NOPB itself does not limit LED current - it regulates current set by the SNS resistor and PFET selection. With proper external components (e.g., 1.5mΩ RDS(on) P-MOSFET, 22µH inductor, 100mV hysteresis), LM3401MM/NOPB reliably drives >1A DC LED current while maintaining ±6% accuracy across -40°C to +125°C junction temperature.
Does LM3401MM/NOPB require an output capacitor?
No - LM3401MM/NOPB operates without an output capacitor due to its hysteretic control architecture and direct current sensing at the LED cathode. This eliminates capacitor-related failure modes, reduces board area, and avoids ESR-induced instability, making LM3401MM/NOPB ideal for long-life, maintenance-free LED lighting systems.
How is LED current accuracy affected by temperature on LM3401MM/NOPB?
LM3401MM/NOPB guarantees ±6% LED current accuracy over -40°C to +125°C junction temperature, primarily limited by the 200mV reference voltage drift (±12mV) and SNS pin bias current variation. External sense resistor TCR and PFET RDS(on) drift dominate residual error - using 0.1% metal foil resistors and low-TCR MOSFETs maintains best-in-class stability.
Can LM3401MM/NOPB drive multiple parallel LED strings?
Yes - LM3401MM/NOPB can drive multiple parallel LED strings when each string has its own dedicated SNS-to-GND sense resistor and shares the same HG-driven P-MOSFET. This configuration maintains per-string current regulation, provided string VF matching is within ±5% to prevent current hogging; mismatched strings require individual LM3401MM/NOPB controllers.
What is the purpose of the HYS pin on LM3401MM/NOPB?
The HYS pin on LM3401MM/NOPB sets the hysteresis window around the 200mV reference voltage at the SNS pin - directly determining LED ripple current magnitude and influencing switching frequency. A resistor from HYS to GND generates 15–25µA current; typical 100kΩ yields ~20mV SNS hysteresis, resulting in ~40mV total window and predictable ripple for given inductor value.
LM3401MM/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
LM3401MM/NOPB FAQ
1.How can I place an order for LM3401MM/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3401MM/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 LM3401MM/NOPB reliable?
The price and inventory of LM3401MM/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM3401MM/NOPB is usually 5 days.
3.What payment methods are accepted for LM3401MM/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3401MM/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3401MM/NOPB?
LM3401MM/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3401MM/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 LM3401MM/NOPB?
For technical support, including LM3401MM/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3401MM/NOPB requirements.
6.How does Aetrix verify that LM3401MM/NOPB is sourced from the original manufacturer or authorized distributors?
All LM3401MM/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 LM3401MM/NOPB meets industry standards.
7.What is the process for return or replacement of LM3401MM/NOPB?
All LM3401MM/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM3401MM/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 LM3401MM/NOPB part is unused and in its original packaging.
Return procedure for LM3401MM/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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