My Inquiry
My Account
Texas Instruments LM3434SQ/NOPB
- Part No.:
- LM3434SQ/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 24-WFQFN Exposed Pad
- Datasheet:
-
LM3434SQ/NOPB.pdf
- Description:
- IC LED DRIVER CTRLR PWM 24WQFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,982
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LM3434SQ/NOPB from Texas Instruments is a high-frequency adaptive constant-on-time DC/DC buck controller for constant-current LED driving, supporting >6A output current, −9V to −30V input voltage (w.r.t. LED anode), and up to 1MHz switching frequency. It enables common-anode LED configurations with direct chassis tie for thermal efficiency and operates without output capacitance.
For engineers reviewing the LM3434SQ/NOPB datasheet, LM3434SQ/NOPB pinout, LM3434SQ/NOPB application, or LM3434SQ/NOPB equivalent, key selection considerations include negative-output capability, analog+PWM dimming interface, adaptive on-time control for ripple stability, and 24-pin WQFN thermal performance in high-power lighting systems.
Technical Context
The LM3434SQ/NOPB implements average current-mode control using a programmable on-time architecture synchronized to LED forward voltage and external RON/CON. Its dual gate drivers (HO/LO) support synchronous buck operation with 26–28ns dead time, while DIMO/DIMR provide dedicated PWM shunt-FET drive referenced to LED cathode.
Current regulation is achieved via CSP/CSN differential sensing with programmable VSENSE (57–63mV typical, adjustable via ADJ pin), and protection includes VCC UVLO (6.0–7.0V), thermal shutdown at 175°C, and logic-level EN/DIM inputs with internal 100kΩ pullup/pulldown resistors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | >6A continuous - supports high-brightness LED strings without external current amplification |
| Input Voltage Range | −9V to −30V w.r.t. CGND - enables common-anode topology with chassis-grounded LED anodes |
| Switching Frequency | Up to 1MHz - allows small magnetics and no output capacitor in stable LED current loop |
| VSENSE Accuracy | 57–63mV (typ. 60mV) - sets LED current via RSENSE = 60mV/ILED; adjustable ±10% via ADJ pin |
| PWM Dimming Support | >30kHz capable - enables flicker-free digital color mixing and field-sequential illumination |
| Quiescent Current | 1mA typical (VEE supply) - minimizes standby power in always-on lighting systems |
| Package | 24-pin WQFN (RTW0024A) - 4×4mm exposed-pad package with θJA = 39°C/W for industrial thermal management |
Pinout & Package
LM3434SQ/NOPB uses a 24-pin WQFN (RTW0024A) package with exposed thermal pad connected to VEE. Pin functions are validated per TI SNVS619B datasheet Rev. May 2013.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| TON | On-time programming node | RC network (RON/CON) sets nominal switching frequency; determines ripple current stability |
| ADJ | Analog current reference input | Adjusts VSENSE from 0.3V/16.67 to VIN/16.67 - enables LED binning compensation and color temperature tuning |
| EN | Logic-enable control | HI ≥1.6V w.r.t. CGND enables operation; internal 100kΩ pullup allows direct VIN tie |
| DIM | PWM brightness control | Logic-level input (1.6V threshold); internal 100kΩ pulldown enables default OFF state |
| CSP / CSN | Differential current sense inputs | Measure voltage across external RSENSE; Kelvin routing required for <6mA error at 6A |
| HO / LO | Synchronous FET gate drivers | HO drives high-side switch referenced to HS; LO drives low-side switch referenced to LS |
| DIMO / DIMR | PWM shunt-FET driver | DIMO switches between DIMR and BST2; enables fast LED short-circuit dimming without affecting main buck loop |
| VEE | Negative power rail | −9V to −30V supply referenced to CGND; connects to exposed pad for thermal conduction |
Key Features
| Feature | Design Value |
|---|---|
| Common-anode LED topology support | Enables direct LED anode connection to chassis ground - maximizes heatsink contact area and simplifies mechanical design |
| No output capacitor required | Stable current regulation achieved via adaptive on-time control and synchronous rectification - reduces BOM cost and board space |
| Negative output voltage capability | Supports −9V to −30V VEE rail - eliminates need for isolated supplies in automotive and industrial chassis-grounded systems |
| Adaptive programmable on-time | Maintains constant ripple current across varying LED VF and input voltage - ensures consistent optical output under dynamic load conditions |
| Integrated soft-start | SS pin accepts 0.1µF capacitor for 12ms ramp - prevents inrush current stress on input capacitors and FETs during power-up |
Applications
| Automotive Headlamp Systems | Projection System Light Engines |
|---|---|
Use Scenario: High-intensity white LED arrays in adaptive front-lighting systems (AFS) requiring precise current control and thermal robustness. IC Role / Device Role / Timing Role: Constant-current buck controller managing >6A per channel with analog trim (ADJ) and 100Hz–10kHz PWM dimming for beam shaping. Use Value: Direct chassis grounding of LED anodes improves thermal resistance by ≤15°C vs. floating designs, extending LED lifetime in under-hood environments. |
Use Scenario: RGB LED light engines in DLP and LCoS projectors demanding flicker-free, high-frequency dimming for color accuracy. IC Role / Device Role / Timing Role: Synchronized current source delivering stable 6A with >30kHz PWM dimming and <10% peak-to-peak ripple for artifact-free video rendering. Use Value: 1MHz max switching frequency enables use of compact 10µH inductors, reducing projector size while maintaining >92% efficiency at 12VLED. |
| Solid-State Street Lighting | Industrial Machine Vision Illumination |
Use Scenario: Outdoor LED luminaires operating continuously at −40°C to +125°C ambient with surge immunity and long service life. IC Role / Device Role / Timing Role: Primary current regulator with thermal shutdown (175°C) and VEE UVLO protection, interfacing to 0–10V analog dimming and DALI gateways. Use Value: −30V VEE rating accommodates 24V system transients; WQFN package with VEE-connected EP ensures reliable thermal dissipation over 100,000-hour lifetime. |
Use Scenario: Stroboscopic LED arrays in high-speed inspection systems requiring microsecond-level dimming edge control. IC Role / Device Role / Timing Role: Fast-response current controller with DIMO/DIMR drive enabling <175ns propagation delay from DIM rise to LED shunt activation. Use Value: Sub-200ns DIM-to-DIMO delay supports 5kHz+ strobe rates for 200fps camera synchronization without motion blur. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED current controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM3424MH/NOPB | Fixed 60mV VSENSE, no ADJ pin; lower max current (3A); requires external PWM generator | Lacks analog current adjustment and integrated DIMO driver - suitable only for fixed-output, low-power signage | Select when BOM cost is critical and LED binning compensation is unnecessary |
| TPS92692QPWPRQ1 | Automotive-grade AEC-Q100; integrated N-channel MOSFET driver; supports 0–100% PWM dimming with spread-spectrum clocking | Includes diagnostic flags (open-load, overtemp) and enhanced EMI control - targets ASIL-B automotive lighting | Choose for automotive safety-critical systems requiring fault reporting and EMC compliance |
Compared with LM3434SQ/NOPB, LM3424MH/NOPB sacrifices programmability and current capability for cost reduction, while TPS92692QPWPRQ1 adds automotive qualification and diagnostics at the expense of higher system complexity and price.
Availability
LM3434SQ/NOPB is available at Aetrix Electronics and suitable for automotive headlamps, projection light engines, solid-state street lighting, and industrial machine vision illumination requiring stable component supply and long-term manufacturability.
Supply support for LM3434SQ/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 high-reliability power conversion and LED lighting solutions.
The LM3434SQ/NOPB belongs to TI's high-brightness LED driver product line, engineered specifically for negative-output, common-anode architectures in thermally constrained environments such as automotive and outdoor lighting.
FAQ
What is the maximum supported LED current for LM3434SQ/NOPB?
The LM3434SQ/NOPB is specified for output currents greater than 6A, with validated operation up to 10A in reference designs (Figure 13) and 20A in parallel configurations (Figure 14). Actual current capability depends on external FET selection, PCB layout, and thermal management - the IC itself regulates current via CSP/CSN sensing and does not limit peak current internally.
Does LM3434SQ/NOPB require an output capacitor?
No, the LM3434SQ/NOPB does not require an output capacitor due to its adaptive constant-on-time control architecture and synchronous buck topology. The datasheet explicitly states "No Output Capacitor Required" as a key feature, relying instead on inductor current ripple control and fast-loop compensation via the COMP pin.
How is analog current adjustment implemented on LM3434SQ/NOPB?
Analog current adjustment on LM3434SQ/NOPB is implemented via the ADJ pin, which scales the internal current sense reference (VSENSE) according to VSENSE = (VADJ − VCGND)/16.67. When ADJ is tied to VIN, VSENSE = 60mV; applying 0.5–1.5V to ADJ adjusts VSENSE linearly from ~30mV to ~90mV, enabling precise LED current tuning for binning or color correction.
What is the purpose of the DIMO and DIMR pins on LM3434SQ/NOPB?
The DIMO (dimming output) and DIMR (dimming return) pins on LM3434SQ/NOPB form a dedicated gate driver for an external PWM shunt FET placed in parallel with the LED string. DIMO switches between DIMR and BST2 to rapidly short the LED during off-cycles, enabling high-frequency dimming (>30kHz) without disrupting the main buck converter's regulation loop or inducing audible noise.
Can LM3434SQ/NOPB operate with positive input voltage rails?
No, LM3434SQ/NOPB is designed exclusively for negative-input operation: VEE must be between −9V and −30V with respect to CGND, and all control signals (EN, DIM, ADJ) are referenced to CGND. It does not support positive-input buck configurations - its architecture assumes LED anode grounded to chassis and cathode driven negative, making it incompatible with standard positive-rail LED drivers.
LM3434SQ/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 24-WFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- DC DC Controller
- Topology:
- Step-Down (Buck)
- Internal Switch(s):
- No
- Number of Outputs:
- 1
- Voltage - Supply (Min):
- 3V
- Voltage - Supply (Max):
- 5.8V
- Voltage - Output:
- -
- Current - Output / Channel:
- -
- Frequency:
- 1MHz
- Dimming:
- PWM
- Applications:
- -
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-WQFN (4x4)
LM3434SQ/NOPB FAQ
1.How can I place an order for LM3434SQ/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3434SQ/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 LM3434SQ/NOPB reliable?
The price and inventory of LM3434SQ/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM3434SQ/NOPB is usually 5 days.
3.What payment methods are accepted for LM3434SQ/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3434SQ/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3434SQ/NOPB?
LM3434SQ/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3434SQ/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 LM3434SQ/NOPB?
For technical support, including LM3434SQ/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3434SQ/NOPB requirements.
6.How does Aetrix verify that LM3434SQ/NOPB is sourced from the original manufacturer or authorized distributors?
All LM3434SQ/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 LM3434SQ/NOPB meets industry standards.
7.What is the process for return or replacement of LM3434SQ/NOPB?
All LM3434SQ/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM3434SQ/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 LM3434SQ/NOPB part is unused and in its original packaging.
Return procedure for LM3434SQ/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM3434SQ/NOPB Tags
-
BCR402RE6327HTSA1
Infineon Technologies
-
BCR430UXTSA2
Infineon Technologies
-
BCR420UE6433HTMA1
Infineon Technologies
-
BCR420UE6327HTSA1
Infineon Technologies
-
BCR421UE6327HTSA1
Infineon Technologies
-
LYT1604D-TL
Power Integrations
-
HV9910CLG-G
Microchip Technology
-
CL2N8-G
Microchip Technology
-
BCR420UW6-7
Diodes Incorporated
-
BCR421UW6-7
Diodes Incorporated
-
BCR420UFD-7
Diodes Incorporated
-
BCR421UFD-7
Diodes Incorporated
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
