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LM3404MA
Texas Instruments
IC LED DRIVER RGLTR PWM 1A 8SOIC
2188 Pcs New Original In Stock
LED Driver IC 1 Output DC DC Regulator Step-Down (Buck) PWM Dimming 1A 8-SOIC
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5.0 / 5.0
- (243 Ratings)
LM3404MA
Product Overview
1332611
DiGi Electronics Part Number
LM3404MA-DGManufacturer
Texas Instruments
LM3404MA
Description
IC LED DRIVER RGLTR PWM 1A 8SOICInventory
2188 Pcs New Original In Stock
LED Driver IC 1 Output DC DC Regulator Step-Down (Buck) PWM Dimming 1A 8-SOIC
Quantity
Minimum 1
Minimum 1
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LM3404MA Technical Specifications
Category
Power Management (PMIC), LED Drivers
Packaging
-
Series
-
Product Status
Discontinued at Digi-Key
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
1A
Frequency
1MHz
Dimming
PWM
Applications
Lighting
Operating Temperature
-40°C ~ 125°C (TJ)
Grade
Automotive
Mounting Type
Surface Mount
Package / Case
8-SOIC (0.154", 3.90mm Width)
Supplier Device Package
8-SOIC
Base Product Number
LM3404
Datasheet & Documents
Design Resources
LM3404 Ref Design RD-134
HTML Datasheet
LM3404MA-DG
Environmental & Export Classification
RoHS Status
RoHS non-compliant
Moisture Sensitivity Level (MSL)
1 (Unlimited)
REACH Status
REACH Unaffected
ECCN
EAR99
HTSUS
8542.39.0001
Additional Information
Standard Package
95
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Reviews
5.0/5.0-(Show up to 5 Ratings)
de desembre 02, 2025
간편한 웹사이트 구조와 합리적인 가격 때문에 자주 방문하는 곳입니다.
de desembre 02, 2025
Der professionelle Umgang bei DiGi Electronics sorgt für ein angenehmes Einkaufserlebnis.
de desembre 02, 2025
The logistics infrastructure they have in place is highly effective.
de desembre 02, 2025
Their commitment to quality and customer care has kept me as a satisfied customer.
de desembre 02, 2025
Impeccable quality and rapid delivery—definitely recommend.
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Frequently Asked Questions (FAQ)
Can the LM3404MA be safely used as a drop-in replacement for the LT3474IFE#TRPBF in a high-reliability automotive lighting design, and what critical layout or compensation adjustments are needed?
While the LM3404MA and LT3474IFE#TRPBF are both 1A buck LED drivers with similar input voltage ranges, they are not direct drop-in replacements due to differences in switching frequency (1MHz vs. 2.2MHz), control loop architecture, and compensation requirements. The LM3404MA uses a fixed off-time current-mode control, which demands careful PCB layout to minimize noise coupling into the feedback node—especially critical in automotive environments. You must re-evaluate the compensation network (typically an RC at the COMP pin) and ensure tight Kelvin connections for current sensing. Additionally, verify EMI performance under CISPR 25 standards, as the lower switching frequency of the LM3404MA may reduce high-frequency emissions but increase inductor size and ripple. Always validate thermal performance under full load at 125°C ambient, as package thermal resistance differs between the 8-SOIC packages of both parts.
What are the key reliability risks when operating the LM3404MA near its maximum junction temperature of 125°C in an enclosed automotive headlamp assembly, and how can they be mitigated?
Operating the LM3404MA at or near its 125°C TJ(max) in an enclosed headlamp significantly increases the risk of thermal runaway, reduced MTBF, and premature failure due to electromigration in the internal switch. Since the 8-SOIC package has limited thermal dissipation (θJA ~ 100°C/W without a heatsink), even modest power dissipation (e.g., 0.5W) can push the die temperature beyond safe limits under high ambient conditions. Mitigation includes adding a copper pour on the PCB with thermal vias to act as a heatsink, minimizing trace resistance in the high-current path to reduce I²R losses, and derating the output current by 20–30% when ambient exceeds 85°C. Also, ensure adequate airflow or consider potting materials with high thermal conductivity. Monitor real-world thermal cycling stress, as repeated expansion/contraction at high TJ accelerates bond wire fatigue.
How does the LM3404MA’s PWM dimming performance compare to the RT8471GJ5 in applications requiring deep dimming below 1% duty cycle, and what circuit modifications improve low-duty-cycle stability?
The LM3404MA supports PWM dimming down to very low duty cycles, but its minimum on-time (~100ns at 1MHz) limits true deep dimming below ~1% without risking pulse skipping or instability. In contrast, the RT8471GJ5 uses a hysteretic control scheme that allows more consistent response at ultra-low dimming levels. To improve low-duty-cycle performance with the LM3404MA, add a small preload resistor (e.g., 100–500Ω) across the LED string to maintain continuous conduction mode, and ensure the PWM signal has sharp edges (<10ns rise/fall) with minimal ground bounce. Also, bypass the VCC pin with a low-ESR ceramic capacitor (<100mΩ) placed within 2mm of the IC to prevent supply droop during fast PWM transitions. Avoid long traces between the PWM source and the DIM pin, as parasitic capacitance can distort narrow pulses.
Is it safe to parallel two LM3404MA devices to achieve 2A output current for high-power LED arrays, and what design safeguards are necessary to prevent current imbalance?
Paralleling LM3404MA devices is not recommended due to lack of current-sharing features and sensitivity to timing skew. Even minor differences in layout, input capacitance, or feedback thresholds can cause one device to carry significantly more current, leading to thermal imbalance and potential failure. The internal switches are not synchronized, so beat frequencies may cause audible noise or EMI issues. If higher current is needed, consider upgrading to a dedicated multi-phase controller or using a single higher-current driver like the LT3517HFE#PBF. If paralleling is unavoidable, use individual current-sense resistors with tight tolerance (±1%), match trace lengths precisely, and add small source resistors (0.1–0.5Ω) in series with each SW node to dampen oscillations. However, this approach reduces efficiency and increases complexity—validate thoroughly under transient load conditions.
Given that the LM3404MA is discontinued at Digi-Key and RoHS non-compliant, what long-term sourcing and compliance strategies should engineers adopt for new automotive lighting designs?
Since the LM3404MA is discontinued at major distributors and non-RoHS compliant, it poses significant supply chain and regulatory risks for new automotive designs. Although it remains REACH unaffected and available through alternate channels, reliance on it jeopardizes production scalability and global market access. Migrate to a modern, compliant alternative such as the LM3404MA/NOPB (the RoHS-compliant version) or evaluate pin-compatible successors like the LT3593ES6#TRMPBF, which offers similar performance with improved efficiency and full compliance. Conduct a full design-in validation including thermal, EMI, and lifetime testing under AEC-Q100 conditions. Secure long-term supply agreements or consider dual-sourcing with a second-source supplier. Document the transition in your BOM and update DFMEA to reflect reduced obsolescence risk—critical for automotive PPAP approval.
Quality Assurance (QC)
DiGi ensures the quality and authenticity of every electronic component through professional inspections and batch sampling, guaranteeing reliable sourcing, stable performance, and compliance with technical specifications, helping customers reduce supply chain risks and confidently use components in production.
LM3404MA CAD Models
Texas Instruments LM3404MA PCB symbols & footprints
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