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Texas Instruments LM3430SD/NOPB
- Part No.:
- LM3430SD/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 12-WFDFN Exposed Pad
- Datasheet:
-
LM3430SD/NOPB.pdf
- Description:
- IC LED DRIVER CTRLR PWM 12WSON
- Quantity:
- Payment:
- Shipping:
Inventory:2,282
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Product details
Overview
LM3430SD/NOPB from Texas Instruments is a high-voltage, current-mode boost controller for LED backlighting applications. It features a 6V–40V input range, 1A peak gate driver, adjustable soft-start, programmable UVLO with hysteresis, and internal 40V startup regulator - enabling direct connection to battery or unregulated DC rails in notebook LCD backlight systems.
For engineers reviewing the LM3430SD/NOPB datasheet, LM3430SD/NOPB pinout, LM3430SD/NOPB application, or LM3430SD/NOPB equivalent, key selection criteria include its 600 kHz typical switching frequency (RT = 27.4 kΩ), 90%+ duty cycle capability, cycle-by-cycle current limiting at 0.5 V on CS, slope compensation for stable CCM operation, and compatibility with external synchronization via RT/SYNC pin.
Technical Context
The LM3430SD/NOPB implements fixed-frequency current-mode PWM control with an internal 1.25 V reference, error amplifier, and precision COMP-to-PWM comparator. Its oscillator supports up to 2 MHz via single RT resistor and accepts AC-coupled external sync signals above 3.8 V threshold.
It integrates a high-side referenced 40 V startup regulator (6.6–7.4 V output), thermal shutdown at 165°C with 25°C hysteresis, and dedicated VDHC pin for dynamic headroom control when paired with LM3432 - enabling real-time output voltage adjustment during LED dimming.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 6 V to 40 V - enables direct interface with 3–4-cell Li-ion batteries or industrial DC rails without pre-regulation. |
| fSW Range | 170 kHz to 2 MHz - set by single RT resistor; 600 kHz typical with 27.4 kΩ - balances inductor size and efficiency in portable backlight designs. |
| Max Duty Cycle | 90% to 95% - supports high step-up ratios required for multi-string white LED arrays (e.g., 33 V out from 9 V in). |
| CS Threshold | 0.45 V to 0.55 V - precise cycle-by-cycle current limit ensures MOSFET protection under transient overload or shorted LED conditions. |
| VFB Accuracy | 1.225 V to 1.275 V over –40°C to +125°C - tight regulation tolerance maintains ±2% LED current accuracy across temperature. |
| OUT Driver | 1 A peak sink/source - drives standard SO-8 N-channel MOSFETs (e.g., 22 mΩ RDSON) with fast 15 ns fall/18 ns rise times. |
| UVLO Hysteresis | 20 µA current source - enables robust enable/disable using external resistor divider or transistor switch without external bias. |
Pinout & Package
LM3430SD/NOPB is housed in a thermally enhanced 12-pin LLP package (3 mm × 3 mm, exposed pad). The DAP (exposed pad) must be soldered to PCB ground for optimal thermal performance (θJA = 122°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (VDHC) | Dynamic Headroom Control Input | Accepts analog voltage from LM3432 to adjust output voltage in real time during PWM dimming - avoids overvoltage stress on LEDs. |
| 2 (VIN) | Main Power Input | Connects directly to 6–40 V supply; powers internal startup regulator and provides bias for high-voltage logic blocks. |
| 3 (FB) | Feedback Input | Inverting input of error amplifier referenced to 1.25 V - sets regulated output voltage via external resistor divider (e.g., RFB1/RFB2). |
| 4 (COMP) | Error Amplifier Output | Connects to FB through RC network for Type II/III loop compensation - determines stability and transient response of current-mode loop. |
| 5 (VCC) | Internal Regulator Output | Bypassed with 0.1–100 µF ceramic capacitor; regulated at 7 V (±0.4 V); powers gate driver and logic - shuts down below 4.7 V. |
| 6 (OUT) | MOSFET Gate Driver Output | Drives low-side N-channel MOSFET gate; 1 A peak drive capability ensures fast turn-on/turn-off of devices with ≤1 nF gate capacitance. |
| 7 (GND) | System Ground Reference | Analog and power ground return - must be connected to DAP and kept separate from high-current sense resistor ground until single-point tie. |
| 8 (UVLO) | Under-Voltage Lockout Input | Programmed via resistor divider from VIN; 1.25 V threshold with 20 µA hysteresis current - enables remote ON/OFF control. |
| 9 (CS) | Current Sense Input | Monitors MOSFET source current via Rsns; 0.5 V threshold triggers immediate gate shutdown - requires local RC filter to suppress ringing. |
| 10 (RT/SYNC) | Oscillator & Sync Input | Resistor-to-GND sets fSW; AC-coupled external clock >3.8 V can synchronize - prevents beat frequencies in multi-controller systems. |
| 11 (SS) | Soft-Start Control | 10 µA current source charges external capacitor - linearly ramps COMP voltage to limit inrush current and prevent overshoot. |
| 12 (NC) | No-Connect | Not internally bonded - must remain unconnected per TI design guidelines. |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable Soft-Start | External SS capacitor sets ramp time - eliminates input surge current and output voltage overshoot during power-up. |
| Internal 40 V Startup Regulator | Eliminates need for external bias supply - delivers regulated 7 V to VCC pin from 6–40 V VIN, reducing BOM count and layout complexity. |
| 1 A Peak Gate Driver | Directly drives standard SO-8 MOSFETs without buffer - reduces propagation delay (<100 ns total) and improves light-load efficiency. |
| Slope Compensation | Internally generated 80–130 mV sawtooth ramp - prevents subharmonic oscillation in CCM boost converters operating >50% duty cycle. |
| External Synchronization | AC-coupled sync input accepts clocks up to 2 MHz - enables phase alignment across multiple LM3430SD/NOPB controllers in large-panel backlight systems. |
| Programmable UVLO with Hysteresis | 20 µA internal current source creates clean enable/disable transition - avoids chatter near threshold and supports battery low-voltage cutoff. |
Applications
| LED Backlight for Notebook LCD Panels | Industrial Display Backlighting |
|---|---|
|
Use Scenario: Driving 6 parallel strings of 8 white LEDs (20 mA each) from 8–21 V battery input in ultraportable notebooks. IC Role / Device Role / Timing Role: Current-mode boost controller regulating 33 V output; manages MOSFET switching, current sensing, and soft-start timing. Use Value: Enables compact, efficient backlight solution with <1% LED current mismatch across strings and seamless PWM dimming via VDHC interface. |
Use Scenario: Powering high-brightness LED arrays in ruggedized HMIs used in factory automation or outdoor kiosks. IC Role / Device Role / Timing Role: High-reliability boost controller with thermal shutdown and wide VIN range - sustains operation across 12–36 V industrial power rails. Use Value: Delivers stable LED current despite input voltage transients and ambient temperatures from –40°C to +85°C - validated per JEDEC JESD22-A108. |
| SEPIC Converter for Wide-Input LED Drivers | Automotive Infotainment Display Backlight |
|
Use Scenario: Implementing non-inverting SEPIC topology to drive 12-LED strings from 6–24 V automotive battery with cold-crank tolerance. IC Role / Device Role / Timing Role: Single-ended controller managing both boost and buck phases via shared inductor - uses same COMP/FB/CS architecture as boost mode. Use Value: Maintains constant LED brightness during engine start (VIN dip to 6 V) without output dropout - leverages 90%+ max duty cycle and fast current limiting. |
Use Scenario: Backlighting TFT displays in automotive head units where EMI compliance and thermal robustness are critical. IC Role / Device Role / Timing Role: AEC-Q100 stress-tested controller (per TI qualification report) - regulates output while rejecting conducted noise on 12 V rail. Use Value: Meets CISPR-25 Class 5 radiated emissions with minimal filtering - enabled by synchronized switching and controlled dV/dt on OUT pin. |
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, MSOP-10 package (4.4 mm × 3 mm); lacks VDHC pin and NC pin; no exposed thermal pad. | Lower thermal performance (θJA = 160°C/W); unsuitable for >1 A continuous output or high-ambient environments. | Select LM3430MM/NOPB only for space-constrained, lower-power designs where thermal margin exceeds 20°C. |
| TPS40210DGQ | Fixed 1.5 MHz oscillator; no VDHC or slope compensation; requires external error amp; 0.5 A gate drive. | Lacks dynamic headroom control and integrated current-mode stability features - demands more complex compensation design. | Choose TPS40210DGQ only when fixed high-frequency operation is mandatory and system-level dimming is handled externally. |
Compared with LM3430MM/NOPB, LM3430SD/NOPB offers superior thermal management and VDHC functionality for adaptive LED voltage control; versus TPS40210DGQ, it delivers integrated slope compensation, higher gate drive, and real-time output tuning - reducing design risk and component count in LED backlight systems.
Availability
LM3430SD/NOPB is available at Aetrix Electronics and suitable for LED backlighting, industrial display power supplies, and automotive infotainment systems requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LM3430SD/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 and embedded processing technologies, with decades of expertise in power management ICs for lighting, computing, and industrial applications.
The LM3430SD/NOPB belongs to TI's LED backlight controller product line, designed specifically for high-efficiency, low-noise boost and SEPIC topologies in portable and automotive displays - emphasizing thermal resilience, dimming flexibility, and ease of loop compensation.
FAQ
What is the maximum recommended switching frequency for LM3430SD/NOPB?
The LM3430SD/NOPB supports up to 2 MHz switching frequency, verified across –40°C to +125°C junction temperature. At 2 MHz (RT = 16.2 kΩ), propagation delays remain <100 ns and slope compensation remains effective. However, gate drive losses increase significantly above 1 MHz - TI recommends 600 kHz (RT = 27.4 kΩ) as optimal for thermal balance in LED backlight designs using LM3430SD/NOPB.
Can LM3430SD/NOPB operate without the internal startup regulator?
Yes - LM3430SD/NOPB can be powered externally by connecting VIN and VCC pins together and applying 7.5 V to 14 V to both. This bypasses the internal 40 V regulator, improving efficiency in systems with auxiliary windings or dedicated bias supplies. When using external bias, the internal regulator is disabled automatically, and VCC pin current draw drops to <100 µA in steady state for LM3430SD/NOPB.
How does the VDHC pin function in LM3430SD/NOPB when used with LM3432?
The VDHC pin on LM3430SD/NOPB accepts an analog voltage (0.5 V to 2.5 V) from the LM3432 to dynamically adjust the feedback reference - enabling real-time output voltage reduction during LED PWM dimming. This minimizes power dissipation in the series current regulators and extends battery life. When LM3432 is not present, VDHC must be left open; connecting it to GND or VCC will cause undefined behavior in LM3430SD/NOPB.
What is the purpose of the NC pin on LM3430SD/NOPB?
Pin 12 on LM3430SD/NOPB is designated NC (No Connect) and is not internally bonded. TI explicitly requires this pin to remain unconnected - floating or grounding it may cause latch-up or parametric shift due to parasitic coupling. The NC designation is confirmed in the official SNVS472A datasheet revision March 2007 and applies strictly to LM3430SD/NOPB in the LLP-12 package.
Does LM3430SD/NOPB support synchronous rectification?
No - LM3430SD/NOPB is a controller-only device that drives an external low-side N-channel MOSFET; it does not integrate or support synchronous rectification. The output stage requires an external Schottky diode (e.g., 40 V, 0.5 A) in boost configuration. Synchronous operation would require a second gate driver channel and complementary timing logic - functionality not present in LM3430SD/NOPB.
LM3430SD/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)
LM3430SD/NOPB FAQ
1.How can I place an order for LM3430SD/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3430SD/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 LM3430SD/NOPB reliable?
The price and inventory of LM3430SD/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM3430SD/NOPB is usually 5 days.
3.What payment methods are accepted for LM3430SD/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3430SD/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3430SD/NOPB?
LM3430SD/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3430SD/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 LM3430SD/NOPB?
For technical support, including LM3430SD/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3430SD/NOPB requirements.
6.How does Aetrix verify that LM3430SD/NOPB is sourced from the original manufacturer or authorized distributors?
All LM3430SD/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 LM3430SD/NOPB meets industry standards.
7.What is the process for return or replacement of LM3430SD/NOPB?
All LM3430SD/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM3430SD/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 LM3430SD/NOPB part is unused and in its original packaging.
Return procedure for LM3430SD/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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