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Texas Instruments LM3430SDX/NOPB
- Part No.:
- LM3430SDX/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 12-WFDFN Exposed Pad
- Datasheet:
-
LM3430SDX/NOPB.pdf
- Description:
- IC LED DRIVER CTRLR PWM 12WSON
- Quantity:
- Payment:
- Shipping:
Inventory:3,501
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Product details
Overview
LM3430SDX/NOPB from Texas Instruments is a high-voltage, current-mode boost controller for LED backlighting applications. It features a 1A peak gate driver, internal 40V startup regulator, programmable UVLO with hysteresis, and supports up to 2 MHz switching frequency with <100 ns propagation delay. Designed for notebook LCD panel backlight drivers in conjunction with LM3432, it implements boost or SEPIC topologies with cycle-by-cycle current limiting and slope compensation.
For engineers reviewing the LM3430SDX/NOPB datasheet, LM3430SDX/NOPB pinout, LM3430SDX/NOPB application, or LM3430SDX/NOPB equivalent, key selection considerations include input voltage range (6–40 V), FB reference accuracy (1.225–1.275 V), maximum duty cycle (>90%), soft-start current (7–13 µA), and thermal shutdown threshold (165°C).
Technical Context
The LM3430SDX/NOPB uses current-mode control with an internal 1.25 V precision reference and error amplifier, enabling inherent input voltage feed-forward and simplified loop compensation. Its PWM comparator integrates slope compensation (80–130 mV amplitude) to prevent sub-harmonic oscillation above 50% duty cycle.
It incorporates a wide-input (6–40 V) high-voltage startup regulator that delivers regulated 7 V at up to 35 mA to the VCC pin, with UVLO hysteresis implemented via a 20 µA internal current source. The OUT pin drives low-side N-channel MOSFETs with 1 A peak sink/source capability, 18 ns rise time, and 15 ns fall time into 1 nF load.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 6 V to 40 V - supports direct connection to automotive battery or multi-cell Li-ion stacks without external pre-regulation. |
| FB Reference Voltage | 1.225–1.275 V - tight tolerance enables accurate output voltage regulation for LED string current control. |
| Max Switching Frequency | 2 MHz - allows compact magnetics and capacitors in space-constrained LCD backlight designs. |
| Gate Driver Peak Current | 1 A - sufficient to drive high-speed MOSFETs with >1 nF gate charge at 600 kHz+ frequencies. |
| Current Sense Threshold | 0.45–0.55 V - sets overcurrent protection level independent of temperature and supply variation. |
| Thermal Shutdown | 165°C with 25°C hysteresis - protects IC during sustained overload or poor PCB thermal design. |
| Soft-Start Current | 7–13 µA - controls ramp rate of external SS capacitor to limit inrush current during power-up. |
| Duty Cycle Limit | 90–95% - supports high step-up ratios required for multi-LED series strings (e.g., 12 LEDs × 3.5 V = 42 V). |
Pinout & Package
LM3430SDX/NOPB is housed in a thermally enhanced 12-lead LLP package (3 mm × 3 mm, DAP exposed pad), optimized for high-power density LED driver layouts and requiring GND-connected thermal pad for reliable operation at full load.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDHC | Dynamic Headroom Control input | Accepts analog voltage from LM3432 to adjust output voltage in real time for optimal LED efficiency. |
| VIN | Main power input | Connects directly to 6–40 V supply; powers internal startup regulator and provides bias for UVLO divider. |
| FB | Feedback node | Inverting input to error amplifier; referenced to 1.25 V internal bandgap for output voltage regulation. |
| COMP | Compensation node | Error amplifier output; connects to FB via RC network to stabilize current-mode control loop. |
| VCC | Internal regulator output | 7 V regulated supply for logic and gate driver; requires 0.1–100 µF ceramic bypass capacitor. |
| OUT | MOSFET gate driver output | 1 A peak push-pull driver for low-side N-MOSFET; fast edge rates support high-frequency operation. |
| GND | System ground reference | Common return for power, signal, and thermal pad; must be low-impedance for stable current sensing. |
| UVLO | Under-voltage lockout input | 20 µA current-source-based threshold detection; enables remote ON/OFF control via external transistor. |
| CS | Current sense input | Monitors MOSFET source current via sense resistor; triggers cycle-by-cycle shutdown at 0.5 V. |
| RT/SYNC | Oscillator timing & sync input | Resistor sets fSW (up to 2 MHz); AC-coupled external clock synchronizes switching for EMI reduction. |
| SS | Soft-start control | 10 µA current charges external capacitor to linearly ramp COMP voltage and limit start-up current. |
| NC | No-connect | Unbonded pin; must remain unconnected per TI specification. |
Key Features
| Feature | Design Value |
|---|---|
| Current-mode control architecture | Enables stable operation across wide VIN/VO ranges and simplifies compensation with built-in slope compensation. |
| Integrated 40 V startup regulator | Eliminates need for external bias supply; delivers 7 V/35 mA to VCC while supporting 6–40 V input directly. |
| Programmable UVLO with hysteresis | 20 µA current source ensures clean turn-on/turn-off transitions and enables robust remote enable/disable. |
| External synchronization capability | AC-coupled RT/SYNC input allows EMI-sensitive systems to align switching edges with system clocks. |
| Adjustable soft-start | 10 µA current source charges external capacitor to control output voltage ramp rate and suppress inrush stress. |
| Thermal shutdown with hysteresis | 165°C trip point and 25°C hysteresis prevent thermal cycling and ensure safe recovery after overheating events. |
Applications
| LED Backlight for Notebook LCD Panels | Automotive Display Backlighting |
|---|---|
Use Scenario: Driving 6 parallel strings of 8–12 white LEDs (33–50 V output) from 8–21 V battery or adapter input in ultra-thin notebook chassis. IC Role / Device Role / Timing Role: Primary boost controller regulating output voltage via current-mode feedback; coordinates with LM3432 for dynamic headroom control. Use Value: Enables >90% duty cycle operation and 2 MHz switching to minimize inductor size while maintaining ±2% output regulation under varying LED forward voltage. | Use Scenario: Powering TFT-LCD instrument cluster backlight in 12 V automotive systems with cold-crank (6 V) and load-dump (40 V) transients. IC Role / Device Role / Timing Role: High-voltage boost controller with integrated UVLO hysteresis and thermal shutdown for robust operation across automotive temperature and voltage extremes. Use Value: Wide 6–40 V input range and 165°C thermal shutdown allow direct battery connection without pre-regulator, reducing BOM count and improving system reliability. |
| Industrial HMI Panel Lighting | Medical Imaging Display Backlight |
Use Scenario: Providing constant-current LED illumination for ruggedized human-machine interface panels used in factory automation environments. IC Role / Device Role / Timing Role: Current-mode boost controller implementing SEPIC topology for non-inverting, isolated-capable output with high PSRR. Use Value: Cycle-by-cycle current limiting and slope compensation ensure stable dimming performance across wide ambient temperature (-40°C to +85°C) and input line variations. | Use Scenario: Precision backlight control in diagnostic-grade medical displays requiring flicker-free, low-noise illumination for image interpretation. IC Role / Device Role / Timing Role: Synchronized boost controller (via RT/SYNC) minimizing conducted EMI in noise-sensitive imaging equipment. Use Value: External clock synchronization capability reduces spectral energy at critical frequencies, meeting IEC 60601-1 EMI requirements without added filtering. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar boost controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM3430MM/NOPB | Same die, 10-pin VSSOP package (4.9 mm × 3.0 mm); no exposed thermal pad; lower thermal performance (θJA = 192°C/W vs. 122°C/W). | Suitable for lower-power (<1.5 W) or cost-sensitive designs where board area permits larger footprint and thermal derating is acceptable. | Select LM3430MM/NOPB only when thermal constraints permit higher junction temperature rise and PCB layout cannot accommodate LLP thermal pad routing. |
| TPS40210DGQ | Current-mode controller with 4.5–52 V input, 2.5 A gate driver, but lacks VDHC pin and dynamic headroom control interface. | Used in general-purpose boost/SEPIC converters; not optimized for LED backlight co-control with companion ICs like LM3432. | Choose TPS40210DGQ for non-backlight applications requiring higher drive strength or wider input range, but avoid when VDHC-based real-time VO adjustment is required. |
Compared with LM3430MM/NOPB, LM3430SDX/NOPB offers superior thermal management and smaller footprint; compared with TPS40210DGQ, it provides dedicated LED backlight features including VDHC interface and tighter FB reference, making it purpose-built for LCD backlight systems with LM3432 coordination.
Availability
LM3430SDX/NOPB is available at Aetrix Electronics and suitable for LED backlighting, automotive display power, industrial HMI lighting, and medical imaging display applications requiring stable component supply and long-term production continuity.
Supply support for LM3430SDX/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 technologies with broad industrial, automotive, and consumer applications.
The LM3430 product line targets high-efficiency LED backlight controllers for portable and display electronics, designed specifically to coordinate with companion ICs (e.g., LM3432) for dynamic headroom optimization and precise current regulation.
FAQ
What is the recommended minimum capacitance for the VCC bypass capacitor on LM3430SDX/NOPB?
The LM3430SDX/NOPB datasheet specifies a recommended VCC bypass capacitor range of 0.1 µF to 100 µF. A 1 µF X7R ceramic capacitor placed within 2 mm of the VCC and GND pins is typical for stable operation. This value ensures adequate charge reservoir for the 1 A gate driver pulses while maintaining low impedance at switching frequencies up to 2 MHz. Using less than 0.1 µF risks VCC droop during high-duty-cycle operation, potentially triggering UVLO or erratic gate drive behavior in the LM3430SDX/NOPB.
Can LM3430SDX/NOPB operate without the VDHC pin connected?
Yes, LM3430SDX/NOPB operates fully functional with the VDHC pin left open-circuit. The VDHC pin is an optional input used exclusively for dynamic headroom control when paired with the LM3432. In standalone boost or SEPIC configurations - such as driving fixed-output LED strings or general DC-DC conversion - leaving VDHC unconnected has no adverse effect on regulation, stability, or protection features of the LM3430SDX/NOPB.
What is the maximum allowable duty cycle for LM3430SDX/NOPB and how is it enforced?
The LM3430SDX/NOPB supports a maximum duty cycle of 90–95%, enforced by internal logic that clamps the PWM comparator output. This limit prevents instability in current-mode control at extreme duty ratios and avoids shoot-through risk in synchronous rectified designs. The exact value depends on operating conditions including input/output voltage ratio and compensation network; design examples in the LM3430SDX/NOPB datasheet confirm reliable operation up to 92% in 12 V → 33 V boost configurations.
How does the LM3430SDX/NOPB implement slope compensation, and why is it necessary?
The LM3430SDX/NOPB generates slope compensation using a 45 µA peak-to-peak sawtooth current source routed through an internal 2 kΩ resistor, producing a minimum 100 mV ramp (typical). This signal adds to the sensed current slope at the CS pin to prevent sub-harmonic oscillation when duty cycle exceeds 50%. Slope compensation is essential for stable current-mode control in boost topologies and is automatically scaled based on external RS1/RS2 resistor values in the current-sense filter network of the LM3430SDX/NOPB.
Is LM3430SDX/NOPB RoHS-compliant and lead-free?
Yes, LM3430SDX/NOPB is RoHS-compliant and lead-free. The "/NOPB" suffix explicitly denotes "No Lead (Pb)-Free", confirming compliance with EU Directive 2011/65/EU and TI's green packaging standards. The device uses matte-tin lead finish and meets JEDEC J-STD-020 moisture sensitivity level 2a (MSL-2a) for surface-mount assembly. Full material declarations and test reports for LM3430SDX/NOPB are available via Texas Instruments' Quality & Environmental Information portal.
LM3430SDX/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 12-WFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- DC DC Controller
- Topology:
- SEPIC, Step-Up (Boost)
- Internal Switch(s):
- No
- Number of Outputs:
- 1
- Voltage - Supply (Min):
- 6V
- Voltage - Supply (Max):
- 40V
- Voltage - Output:
- -
- Current - Output / Channel:
- -
- Frequency:
- 2MHz
- Dimming:
- PWM
- Applications:
- Backlight
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 12-WSON (3x3)
LM3430SDX/NOPB FAQ
1.How can I place an order for LM3430SDX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3430SDX/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 LM3430SDX/NOPB reliable?
The price and inventory of LM3430SDX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM3430SDX/NOPB is usually 5 days.
3.What payment methods are accepted for LM3430SDX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3430SDX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3430SDX/NOPB?
LM3430SDX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3430SDX/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 LM3430SDX/NOPB?
For technical support, including LM3430SDX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3430SDX/NOPB requirements.
6.How does Aetrix verify that LM3430SDX/NOPB is sourced from the original manufacturer or authorized distributors?
All LM3430SDX/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 LM3430SDX/NOPB meets industry standards.
7.What is the process for return or replacement of LM3430SDX/NOPB?
All LM3430SDX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM3430SDX/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 LM3430SDX/NOPB part is unused and in its original packaging.
Return procedure for LM3430SDX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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