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Texas Instruments LM3402MM/NOPB
- Part No.:
- LM3402MM/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LM3402MM/NOPB.pdf
- Description:
- IC LED DRV RGLTR PWM 8VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:13,763
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Product details
Overview
LM3402MM/NOPB from Texas Instruments is a monolithic 0.5-A constant-current buck regulator with integrated 0.7-Ω N-channel MOSFET, 200-mV current-sense reference, 6–42 V input range, and hysteretic controlled-on-time (COT) architecture-designed specifically to drive high-power LED strings in automotive headlamps and industrial lighting systems.
For engineers reviewing the LM3402MM/NOPB datasheet, LM3402MM/NOPB pinout, LM3402MM/NOPB application, or LM3402MM/NOPB equivalent, key selection criteria include its VIN range compatibility, PWM dimming support via TTL-level DIM pin, thermal shutdown at 165°C, cycle-by-cycle current limiting at 735 mA, and absence of control-loop compensation requirements.
Technical Context
The LM3402MM/NOPB implements a controlled-on-time (COT) architecture combining hysteretic current regulation with a voltage-dependent one-shot timer. Its CS pin compares sensed voltage across RSNS against a precise 200-mV reference to initiate switching, while RON sets tON inversely proportional to VIN-enabling stable operation across wide input ranges without loop compensation.
It integrates a 7-V internal linear regulator (VCC), bootstrap gate driver for high-side N-MOSFET, fast PWM dimming with 75-µA internal pullup on DIM, and dual protection: overvoltage/overcurrent comparator (300 mV threshold) and thermal shutdown with 25°C hysteresis. The device operates exclusively in continuous conduction mode (CCM) for predictable frequency behavior.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 6 V to 42 V - supports 12 V and 24 V automotive battery rails with margin for transients. |
| Output Current | 500 mA max over temperature - delivers stable LED current despite junction heating up to 125°C. |
| CS Reference Voltage | 200 mV ±3 mV - enables accurate current setting with low-value, high-precision sense resistors (e.g., 0.4 Ω for 500 mA). |
| Current Limit Threshold | 735 mA typical - provides robust short-circuit and open-LED fault protection without external circuitry. |
| Switch RDS(on) | 0.7 Ω typical at VGS = 6.3 V - minimizes conduction loss in high-current LED paths. |
| Thermal Shutdown | 165°C with 25°C hysteresis - prevents permanent damage during sustained overload or poor heatsinking. |
| Shutdown Current | 90 µA typical - enables ultra-low-power standby in battery-operated lighting systems. |
Pinout & Package
LM3402MM/NOPB is housed in an 8-pin VSSOP (DGK) package measuring 3.00 mm × 3.00 mm with exposed thermal pad (DAP) for enhanced power dissipation. The DAP must be soldered to PCB ground plane using 4–6 thermal vias.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW | Switch node output | Connects directly to inductor and Schottky diode anode; carries full switching current and high dv/dt. |
| BOOT | Bootstrap supply | Drives high-side MOSFET gate; requires 10-nF ceramic capacitor between BOOT and SW for floating bias generation. |
| DIM | PWM dimming input | TTL-compatible logic input (VIL ≤ 0.8 V, VIH ≥ 2.2 V); 75-µA internal pullup ensures default ON state when floating. |
| GND | Power and signal ground | Common return for CS, RON, DIM, and VCC bypass; must be low-impedance connection to DAP and system ground. |
| CS | Current sense feedback | High-impedance input comparing VSNS to 200-mV reference; sets LED current via RSNS to GND. |
| RON | Controlled-on-time programming | Resistor from RON to VIN sets tON; determines switching frequency and maximum duty cycle. |
| VCC | Internal LDO output | 7-V regulated supply for gate driver and control logic; bypass with ≥0.1-µF X5R/X7R ceramic capacitor. |
| VIN | Main power input | Accepts 6–42 V DC; powers internal LDO and supplies energy to switching stage via high-side MOSFET. |
Key Features
| Feature | Design Value |
|---|---|
| No compensation required | Hysteretic COT control eliminates need for external compensation network-reducing BOM count and layout sensitivity. |
| Ceramic-capacitor compatible | Stable with all-ceramic output configurations or even capacitor-less LED loads-enabling compact, low-cost designs. |
| Built-in open-LED protection | OVP/OCP comparator disables switch if CS exceeds 300 mV-preventing destructive voltage rise during LED string breakage. |
| Integrated 7-V LDO | Self-biases gate driver and analog circuitry from VIN; regulates at 7 V above 8.8 V input-eliminating external bias supply. |
| Fast PWM dimming | Sub-microsecond enable/disable response on DIM pin-supports >1 kHz dimming without visible flicker or current overshoot. |
Applications
| Automotive Headlamp Driver | Industrial High-Bay Lighting |
|---|---|
|
Use Scenario: Driving 3–5 series-connected white LEDs (VF ≈ 3.2–3.6 V each) in 12 V or 24 V vehicle electrical systems with load dump immunity. IC Role / Device Role / Timing Role: Constant-current buck controller regulating LED current at 350–500 mA with programmable tON and thermal foldback. Use Value: Eliminates need for external current-sense amplifier or compensation components; withstands 42 V transients per ISO 7637-2. |
Use Scenario: Powering multi-string parallel LED arrays in warehouse ceiling fixtures operating from 24–48 V DC distribution rails. IC Role / Device Role / Timing Role: Primary current regulator with RON-programmable switching frequency (100–1000 kHz) to balance EMI, efficiency, and magnetics size. Use Value: Enables single-chip solution for 10–20 W LED modules with <±3% current accuracy over temperature and line. |
| Emergency Exit Sign Illumination | UV-C Sterilization Module |
|
Use Scenario: Battery-backed LED driver for Class A emergency signage requiring >90-minute runtime at regulated brightness. IC Role / Device Role / Timing Role: Low-quiescent-current (90 µA shutdown) buck controller supporting PWM dimming and thermal derating during extended operation. Use Value: Extends battery life via ultra-low ISD; maintains consistent lumen output across 10–30°C ambient range. |
Use Scenario: Driving high-forward-voltage UV-C LEDs (VF ≈ 6.8–7.2 V) in portable disinfection wands powered by Li-ion packs (8–12 V). IC Role / Device Role / Timing Role: High-efficiency current source delivering 350 mA with minimal voltage headroom loss (VIN – VOUT ≥ 2 V). Use Value: Achieves >92% efficiency at 10 W output; avoids thermal runaway via cycle-by-cycle current limit and 165°C shutdown. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar constant-current LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM3402HVMM/NOPB | Wider 6–75 V VIN range; identical pinout and functional block diagram; same 200-mV CS reference and 735-mA current limit. | Required for 48 V industrial or 60 V telecom-powered LED systems where LM3402MM/NOPB's 42 V max is insufficient. | Select LM3402HVMM/NOPB only when input voltage exceeds 42 V; otherwise LM3402MM/NOPB offers lower cost and same performance. |
| MPQ4425AGL-AEC1-P | 40 V max VIN; 1.2 A output; synchronous rectification; requires external compensation; AEC-Q100 Grade 1 qualified. | Targets automotive cabin lighting with higher current and stricter qualification; not drop-in due to different pinout and control scheme. | Choose MPQ4425AGL-AEC1-P only for AEC-Q100-compliant designs needing >500 mA or synchronous efficiency gains; LM3402MM/NOPB remains optimal for cost-sensitive 500 mA applications. |
Compared with LM3402HVMM/NOPB, the LM3402MM/NOPB trades input voltage headroom for lower unit cost and identical thermal/current performance below 42 V; versus MPQ4425AGL-AEC1-P, it offers simpler design, no compensation, and lower BOM count-but lacks automotive qualification and synchronous efficiency.
Availability
LM3402MM/NOPB is available at Aetrix Electronics and suitable for automotive headlamps, industrial high-bay lighting, and emergency exit signage requiring stable component supply, long-term lifecycle support, and traceable sourcing from authorized channels.
Supply support for LM3402MM/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 LM3402MM/NOPB belongs to TI's dedicated LED driver product line, engineered for high-efficiency, thermally robust constant-current regulation in harsh environments-targeting automotive, industrial, and safety-critical illumination systems.
FAQ
What is the maximum input voltage rating for LM3402MM/NOPB?
The absolute maximum input voltage (VIN to GND) for LM3402MM/NOPB is 45 V, with recommended operation up to 42 V. Exceeding 42 V risks violating recommended conditions and may trigger thermal shutdown or reduce lifetime reliability. This rating is specific to the LM3402 variant; the LM3402HVMM/NOPB supports up to 75 V.
Does LM3402MM/NOPB require external compensation components?
No, LM3402MM/NOPB does not require external compensation components. Its hysteretic controlled-on-time (COT) architecture inherently stabilizes the control loop without feedback compensation networks-reducing design complexity, PCB area, and component count compared to voltage-mode or current-mode controllers.
How is LED current set on LM3402MM/NOPB?
LED current is set by a single resistor (RSNS) connected between the CS pin and ground. With a precise 200-mV current-sense reference, the average LED current equals 0.2 V ÷ RSNS (e.g., 0.4 Ω yields 500 mA). The CS pin bias current is only 0.1 µA, minimizing error contribution from RSNS tolerance.
Can LM3402MM/NOPB operate without an output capacitor?
Yes, LM3402MM/NOPB supports capacitor-less LED operation. Its current-regulation topology relies on inductor current continuity-not output voltage stability-so no output capacitor is needed. A small 10-nF capacitor across the LED string may be added to dampen ringing but is not required for regulation.
What protection features are built into LM3402MM/NOPB?
LM3402MM/NOPB integrates cycle-by-cycle current limiting (735 mA typical), thermal shutdown (165°C with 25°C hysteresis), open-LED protection via CS overvoltage comparator (300 mV threshold), and input undervoltage lockout on VCC (5.25 V). These functions operate autonomously without external components.
LM3402MM/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 Regulator
- Topology:
- Step-Down (Buck)
- Internal Switch(s):
- Yes
- Number of Outputs:
- 1
- Voltage - Supply (Min):
- 6V
- Voltage - Supply (Max):
- 42V
- Voltage - Output:
- 40V
- Current - Output / Channel:
- 500mA
- Frequency:
- 1MHz
- Dimming:
- PWM
- Applications:
- Lighting
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-VSSOP
LM3402MM/NOPB FAQ
1.How can I place an order for LM3402MM/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3402MM/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 LM3402MM/NOPB reliable?
The price and inventory of LM3402MM/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM3402MM/NOPB is usually 5 days.
3.What payment methods are accepted for LM3402MM/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3402MM/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3402MM/NOPB?
LM3402MM/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3402MM/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 LM3402MM/NOPB?
For technical support, including LM3402MM/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3402MM/NOPB requirements.
6.How does Aetrix verify that LM3402MM/NOPB is sourced from the original manufacturer or authorized distributors?
All LM3402MM/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 LM3402MM/NOPB meets industry standards.
7.What is the process for return or replacement of LM3402MM/NOPB?
All LM3402MM/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM3402MM/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 LM3402MM/NOPB part is unused and in its original packaging.
Return procedure for LM3402MM/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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