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Texas Instruments LM3435SQ/NOPB
- Part No.:
- LM3435SQ/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 40-WFQFN Exposed Pad
- Datasheet:
-
LM3435SQ/NOPB.pdf
- Description:
- IC LED DRVR RGLTR I2C 2A 40WQFN
- Quantity:
- Payment:
- Shipping:
Inventory:862
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Product details
Overview
LM3435SQ/NOPB from Texas Instruments is a synchronous flyback RGB LED driver IC for sequential color control in portable projectors. It integrates main and synchronous MOSFETs, three N-channel current-regulating switches, supports up to 2 A per channel, delivers ±3% LED current accuracy, and operates from 2.7–5.5 V input with I²C programmability for 1024-level per-channel current tuning.
For engineers reviewing the LM3435SQ/NOPB datasheet, LM3435SQ/NOPB pinout, LM3435SQ/NOPB application, or LM3435SQ/NOPB equivalent, key selection considerations include its sequential RGB timing architecture, thermal shutdown at 163°C, fault reporting via I²C, programmable switching frequency up to 1 MHz, and compatibility with ceramic output capacitors requiring no loop compensation.
Technical Context
The LM3435SQ/NOPB implements a proprietary Projected On-Time (POT) control scheme for its synchronous flyback converter, using VOUT–VIN differential and an external RT resistor to determine MOSFET on-time without external compensation. It operates exclusively in Continuous Conduction Mode with adaptive dead-time control to prevent shoot-through.
Three independent low-side N-channel current regulators-each referenced to a dedicated IREFx pin and controlled by RCTRL/GCTRL/BCTRL inputs-enable non-overlapping RGB sequencing. Fault detection (open/short) is latched on three consecutive falling edges of the affected channel's control signal and reported via both FAULT pin and I²C register 05h.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7 V to 5.5 V - supports single-cell Li-ion and USB-powered systems without external LDO. |
| Max LED Current per Channel | 2 A - enables high-brightness RGB LEDs in pico projector applications with thermal derating above 50°C. |
| LED Current Accuracy | ±3% typical - ensures consistent color balance across RGB channels under varying temperature and supply conditions. |
| I²C Resolution | 10-bit (1024 levels) per channel - allows fine-grained dimming control and gamma correction in display systems. |
| Switching Frequency Range | Up to 1 MHz - permits use of small inductors and minimizes EMI in space-constrained portable designs. |
| Thermal Shutdown Threshold | 163°C with 20°C hysteresis - protects device during sustained high-current operation without requiring external thermal sensors. |
| Fault Reporting Latency | 3 consecutive CTRL signal falling edges - provides robust false-trigger immunity while enabling rapid failure isolation. |
Pinout & Package
LM3435SQ/NOPB uses a thermally enhanced 40-pin WQFN package (RSB0040A) with exposed pad (EP) for direct PCB thermal coupling. Pin count, layout, and thermal pad placement are optimized for high-power LED driver thermal management in compact projector modules.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pins 14,15,16,17,37) | Power Input | Primary supply rail; accepts 2.7–5.5 V; multiple pins reduce IR drop and improve current handling. |
| VOUT (Pins 30,31,32) | Flyback Output Node | Connects to LED anodes; voltage dynamically adjusted per channel to minimize regulator headroom loss. |
| RLED/GLED/BLED (Pins 21–26) | LED Cathode Outputs | Low-side current sink outputs; each drives one RGB LED cathode with integrated 0.1–0.2 Ω RDS(on). |
| IREFR/IREFG/IREFB (Pins 6,7,8) | Current Reference Inputs | Accept external resistors to set nominal LED current (e.g., 16.5 kΩ → 1.5 A); enable precise analog trimming. |
| SCLK/SDATA (Pins 12,13) | I²C Interface | Standard two-wire bus; supports 400 kHz operation; SVDD (Pin 11) powers logic separately from VIN for noise isolation. |
| FAULT (Pin 27) | Open/Short Fault Indicator | Active-high open-drain output; pulls high on confirmed LED fault; resets via EN pulse or I²C register write. |
Key Features
| Feature | Design Value |
|---|---|
| Sequential RGB Timing Control | Enables single-stage power conversion for all three colors, reducing BOM count and board area versus parallel drivers. |
| Integrated Synchronous Flyback Converter | Eliminates need for external diode and reduces conduction losses; supports ceramic output capacitors with no compensation network. |
| Per-Channel I²C Programmability | Allows real-time current adjustment and gamma mapping without hardware changes-critical for color calibration in embedded projectors. |
| Automatic VOUT Optimization | Dynamically sets output voltage just above each LED's forward voltage during active channel time, maximizing efficiency across color transitions. |
| Hardware-Based Fault Detection | Detects open-circuit (VOUT > 4.7 V above VIN) and short-circuit (VOUT < 1.5 V above VIN) conditions independently per channel with latch-and-report behavior. |
Applications
| Pico RGB LED Projector | USB-Powered Portable Display |
|---|---|
Use Scenario: Miniaturized DLP or LCoS projector module requiring high-lumen RGB illumination in <100 cm³ volume. IC Role / Device Role / Timing Role: Primary RGB LED power controller; sequences red/green/blue illumination synchronously with video frame timing via RCTRL/GCTRL/BCTRL signals. Use Value: Reduces system power dissipation by dynamically adjusting VOUT per LED forward voltage-achieving >85% peak efficiency across color transitions. | Use Scenario: Battery-operated handheld projector powered by USB-C PD (5 V) with thermal constraints limiting continuous brightness. IC Role / Device Role / Timing Role: Integrated current regulator and DC-DC converter; manages thermal load via 163°C shutdown and reports faults over I²C for graceful brightness rollback. Use Value: Enables 2 A per-channel drive from 5 V input while maintaining ±3% current matching-preserving color fidelity during battery voltage sag. |
| Li-ion–Powered Wearable Display | Embedded Automotive HUD Lighting |
Use Scenario: Near-eye display with RGB micro-LED array requiring precise current control and minimal EMI in close proximity to RF circuits. IC Role / Device Role / Timing Role: Sequential LED driver with 1 MHz programmable switching frequency; uses ceramic capacitors and no loop compensation to suppress conducted noise. Use Value: Achieves fast transient response (<10 µs settling) during color switching-eliminating visible transition artifacts in high-frame-rate displays. | Use Scenario: Compact head-up display unit where space, thermal density, and functional safety monitoring are critical. IC Role / Device Role / Timing Role: RGB driver with dual-fault reporting (I²C + FAULT pin); supports ASIL-B–level diagnostics via configurable fault latching and reset protocol. Use Value: Provides hardware-verified open/short detection per channel with deterministic latency-enabling ISO 26262-compliant failure response without MCU intervention. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar RGB LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLC59284RTJR | Constant-current sink driver with 16-channel PWM; no integrated DC-DC converter; requires external 5–24 V supply. | Designed for static signage or backlighting-not sequential RGB projection requiring dynamic VOUT optimization. | Select when driving pre-regulated LEDs with fixed supply and needing higher channel count over sequential timing. |
| TPS61165DRVR | Single-channel white LED boost driver; supports I²C but lacks RGB sequencing logic, per-channel current registers, or fault reporting per LED. | Targeted at monochrome LED flash or backlight; no RCTRL/GCTRL/BCTRL interface or multi-color timing control. | Select only for single-color high-current LED applications where sequential RGB control and fault isolation are unnecessary. |
Compared with TLC59284RTJR and TPS61165DRVR, LM3435SQ/NOPB uniquely integrates synchronous flyback conversion, per-channel current regulation with 10-bit I²C control, and hardware-based open/short fault detection-making it the only solution purpose-built for thermally constrained, sequential RGB projection systems.
Availability
LM3435SQ/NOPB is available at Aetrix Electronics and suitable for pico projector development, USB-powered portable displays, and Li-ion–powered wearable optics requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LM3435SQ/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 decades of expertise in high-efficiency LED drivers and precision power conversion.
The LM3435 product line was designed specifically for sequential RGB LED driving in portable and pico-projector applications-emphasizing thermal efficiency, minimal external components, and robust fault handling in space- and power-constrained environments.
FAQ
What is the maximum supported LED forward voltage range for LM3435SQ/NOPB?
The LM3435SQ/NOPB supports LED forward voltages from 2.0 V to 4.5 V per channel. Its synchronous flyback converter dynamically adjusts VOUT to match each LED's forward voltage during active channel time, ensuring optimal efficiency. The absolute maximum VOUT–VIN differential is limited to approximately 4.7 V to prevent damage during open-fault conditions.
How does LM3435SQ/NOPB handle overlapping RCTRL, GCTRL, and BCTRL signals?
LM3435SQ/NOPB implements fixed priority logic: GREEN > BLUE > RED. If overlapping control signals occur, only the highest-priority active channel remains enabled. However, if a lower-priority channel is already conducting when a higher-priority signal arrives, the lower-priority channel continues until its control signal deactivates-preventing unintended flicker or dropout during rapid transitions.
Can LM3435SQ/NOPB operate without I²C communication after initial configuration?
Yes. LM3435SQ/NOPB retains its last-programmed current settings in internal registers and functions fully with only RCTRL/GCTRL/BCTRL signals for basic on/off sequencing. I²C is required only for dynamic current adjustment, fault register readback, or reconfiguration-making it suitable for resource-constrained microcontrollers with limited I/O.
What thermal management features does LM3435SQ/NOPB include beyond junction shutdown?
In addition to 163°C thermal shutdown with 20°C hysteresis, LM3435SQ/NOPB features a thermally enhanced 40-pin WQFN package with exposed pad (EP) for direct PCB copper thermal spreading. Its POT control architecture eliminates loop compensation components, reducing heat-generating passive elements, and its sequential operation inherently lowers average power dissipation versus simultaneous RGB drive.
Is LM3435SQ/NOPB compatible with ceramic output capacitors, and why does that matter?
Yes. LM3435SQ/NOPB is explicitly designed to be stable with ceramic and other low-ESR capacitors-no electrolytic or tantalum capacitors required. This eliminates aging-related capacitance drift, improves reliability in portable devices, reduces board area, and enables fast transient response (<10 µs) essential for artifact-free RGB color switching in projectors.
LM3435SQ/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 40-WFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- DC DC Regulator
- Topology:
- Flyback
- Internal Switch(s):
- Yes
- Number of Outputs:
- 3
- Voltage - Supply (Min):
- 2.7V
- Voltage - Supply (Max):
- 5.5V
- Voltage - Output:
- -
- Current - Output / Channel:
- 2A (Switch)
- Frequency:
- 1MHz
- Dimming:
- I2C
- Applications:
- -
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 40-WQFN (5x5)
LM3435SQ/NOPB FAQ
1.How can I place an order for LM3435SQ/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3435SQ/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 LM3435SQ/NOPB reliable?
The price and inventory of LM3435SQ/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM3435SQ/NOPB is usually 5 days.
3.What payment methods are accepted for LM3435SQ/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3435SQ/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3435SQ/NOPB?
LM3435SQ/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3435SQ/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 LM3435SQ/NOPB?
For technical support, including LM3435SQ/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3435SQ/NOPB requirements.
6.How does Aetrix verify that LM3435SQ/NOPB is sourced from the original manufacturer or authorized distributors?
All LM3435SQ/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 LM3435SQ/NOPB meets industry standards.
7.What is the process for return or replacement of LM3435SQ/NOPB?
All LM3435SQ/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM3435SQ/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 LM3435SQ/NOPB part is unused and in its original packaging.
Return procedure for LM3435SQ/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM3435SQ/NOPB Tags
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BCR402RE6327HTSA1
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BCR430UXTSA2
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BCR420UE6433HTMA1
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HV9910CLG-G
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CL2N8-G
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BCR420UW6-7
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BCR421UW6-7
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BCR420UFD-7
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