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Texas Instruments LM3435SQX/NOPB
- Part No.:
- LM3435SQX/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 40-WFQFN Exposed Pad
- Datasheet:
-
LM3435SQX/NOPB.pdf
- Description:
- IC LED DRVR RGLTR I2C 2A 40WQFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,661
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Product details
Overview
LM3435SQX/NOPB from Texas Instruments is a synchronous flyback RGB LED driver IC designed for sequential color control in portable projectors. It delivers up to 2 A per channel with ±3% current accuracy, supports 2.7–5.5 V input, and integrates main/synchronous MOSFETs and three N-channel current-regulating switches in a thermally enhanced 40-pin WQFN package for Li-ion/USB-powered pico projector applications.
For engineers reviewing the LM3435SQX/NOPB datasheet, LM3435SQX/NOPB pinout, LM3435SQX/NOPB application, or LM3435SQX/NOPB equivalent, key selection considerations include I²C-programmable 10-bit per-channel current (0.0012 A to 2 A), projected on-time (POT) control enabling no-loop-compensation operation, fault detection via FAULT pin and I²C register reporting, and thermal shutdown at 163°C.
Technical Context
The LM3435SQX/NOPB implements a proprietary Projected On-Time (POT) control scheme for its synchronous flyback converter, using VIN, VOUT, and RT-resistor feedback to dynamically set 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 controlled by dedicated IREFx pins and programmable via I²C registers-sequentially drive R/G/B LEDs with blanking intervals of 5–35 µs between channels. Priority logic ensures only one LED is active at a time (GREEN > BLUE > RED), eliminating color overlap and minimizing regulator power dissipation.
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 5 V supply rails without external regulation. |
| Max LED Current per Channel | 2 A - enables high-brightness RGB output in compact pico projector form factors. | Current Accuracy | ±3% - ensures consistent color balance and luminance across temperature and supply variation. |
| I²C Resolution | 10-bit per channel (1–1023 codes) - provides fine-grained, real-time current adjustment (e.g., 1.5 A → ±1.5 mA step). |
| Switching Frequency | Up to 1 MHz - set by external RT resistor; allows optimization of inductor size and efficiency trade-offs. |
| Thermal Shutdown Threshold | 163°C with 20°C hysteresis - protects against sustained overloads while permitting brief peak-power operation. |
| Fault Detection | Open/short LED detection per channel reported via FAULT pin and I²C register 05h - enables system-level diagnostics without additional sensing circuitry. |
Pinout & Package
LM3435SQX/NOPB is housed in a 40-pin thermally enhanced WQFN package (RSB0040A) with exposed pad (EP) for PCB-level heat sinking. Pin pitch is 0.4 mm; package dimensions are 6.0 mm × 6.0 mm × 0.8 mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PGND (1,2,38–40) | Power Ground | Low-impedance return path for high-current switching nodes (SW, VOUT); must be connected directly to thermal pad and ground plane. |
| VIN (14–17,37) | Main Power Input | Supplies both flyback converter and internal logic; accepts 2.7–5.5 V with UVLO at 2.5 V. |
| VOUT (30–32) | Flyback Output Node | Connects to LED anodes; voltage dynamically adjusted per channel (2.0–4.5 V above VIN) to minimize regulator headroom loss. |
| RLED/GLED/BLED (21–26) | LED Cathode Outputs | Low-side current-regulated outputs; each drives one LED cathode with integrated 0.1 Ω RDS(on) switch. |
| RCTRL/GCTRL/BCTRL (18–20) | Channel Enable Inputs | Active-high TTL-compatible signals that select active LED; priority logic resolves simultaneous asserts (G > B > R). |
| SDATA/SCLK (12–13) | I²C Interface | Bi-directional data and clock lines supporting 400 kHz operation; require external pull-ups to SVDD. |
| FAULT (27) | Open/Short Fault Indicator | Open-drain output pulled high upon detected LED fault; latched until cleared via EN pulse or I²C register write. |
| EN (28) | Global Enable | Active-high input with internal pull-up; device disabled when voltage < 0.2 × VIN. |
Key Features
| Feature | Design Value |
|---|---|
| Sequential RGB Driving Mode | Enables single-stage power conversion for all three colors, reducing BOM count and board area versus three independent drivers. |
| No Loop Compensation Required | POT control architecture eliminates need for external compensation components, simplifying layout and improving transient response to color transitions. |
| Stable with Ceramic Output Capacitors | Supports low-ESR ceramic caps (no electrolytics needed), reducing footprint and improving reliability in space-constrained portable designs. |
| Integrated MOSFETs | On-die N-channel main switch (RDS(on) = 40 mΩ), P-channel sync switch (60 mΩ), and three N-channel LED switches (100 mΩ) minimize external component count. |
| I²C Fault Reporting | Registers open/short faults per channel in I²C address 05h, allowing host MCU to log errors and initiate recovery without hardware polling. |
Applications
| Pico RGB LED Projector | USB-Powered Portable Display |
|---|---|
Use Scenario: Miniaturized embedded projector using sequential RGB illumination to achieve full-color video with minimal optical complexity. IC Role / Device Role / Timing Role: Primary RGB LED driver controlling timing, current, and fault status; synchronizes VOUT regulation to R/G/B enable edges via POT control. Use Value: Reduces total solution size by integrating flyback controller and three current regulators, enabling sub-50 mm projector modules. | Use Scenario: Battery-operated handheld display requiring efficient, compact RGB backlighting with real-time brightness/color tuning. IC Role / Device Role / Timing Role: System-level LED power manager interfacing directly with host MCU via I²C; handles thermal management and fault recovery autonomously. Use Value: Enables dynamic current scaling (0.0012 A to 2 A) and fast channel switching (<100 µs transition delay), supporting smooth video playback and low-power standby modes. |
| Li-ion Powered Wearable HUD | Embedded Automotive Interior Lighting |
Use Scenario: Augmented reality eyewear with micro-display and RGB laser/LED illumination powered by single-cell Li-ion battery. IC Role / Device Role / Timing Role: High-efficiency sequential driver delivering precise current matching across channels under varying battery voltage (3.0–4.2 V). Use Value: Maintains ±3% current accuracy across 2.7–5.5 V input range and –40°C to +125°C junction temperature, ensuring stable color point during battery discharge. | Use Scenario: Dashboard or ambient lighting module requiring RGB color mixing, fault resilience, and automotive-grade thermal performance. IC Role / Device Role / Timing Role: Robust LED driver with thermal shutdown (163°C), open/short detection, and latchable FAULT output for ASIL-B–compatible diagnostics. Use Value: Eliminates need for discrete fault monitoring circuitry; I²C register access allows integration into vehicle CAN/FlexRay gateway diagnostics. |
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 boost/buck supply. | Designed for parallel multi-LED strings (e.g., signage), not sequential RGB projection. | Select when driving >3 LEDs per color or when system already provides regulated VOUT; not suitable for VOUT-optimizing sequential operation. |
| TPS61165DRVR | Single-channel white LED driver with boost converter; supports I²C but lacks RGB sequencing logic and triple-channel current regulation. | Targeted at backlighting or indicator applications with one LED type, not color-mixed projection. | Choose for cost-sensitive single-color systems; cannot replace LM3435SQX/NOPB's sequential timing, priority logic, or per-channel current programming. |
Compared with TLC59284RTJR and TPS61165DRVR, the LM3435SQX/NOPB uniquely integrates sequential RGB timing control, dynamic VOUT optimization per channel, and on-die flyback power stage-enabling higher efficiency and smaller footprint in pico projector designs where color fidelity and thermal density are critical.
Availability
LM3435SQX/NOPB is available at Aetrix Electronics and suitable for Li-ion battery-powered projectors, USB-powered portable displays, and wearable HUD systems requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LM3435SQX/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 company headquartered in Dallas, Texas, delivering analog and embedded processing solutions for industrial, automotive, and personal electronics markets.
The LM3435 product line was developed specifically for high-efficiency sequential RGB LED driving in portable projection systems, emphasizing thermal performance, minimal external component count, and I²C-based system integration.
FAQ
What is the maximum LED forward voltage supported by the LM3435SQX/NOPB?
The LM3435SQX/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, maintaining optimal headroom. The absolute maximum VOUT–VIN differential is approximately 4.7 V, limiting usable forward voltage based on input supply-for example, at VIN = 2.7 V, max VF ≈ 7.4 V; at VIN = 5.5 V, max VF ≈ 10.2 V. This behavior is confirmed in the Electrical Characteristics table and Operation Description section of the SNVS724C datasheet.
Does the LM3435SQX/NOPB support simultaneous RGB LED activation?
No, the LM3435SQX/NOPB does not support simultaneous RGB LED activation. It operates exclusively in sequential mode: only one LED channel (RED, GREEN, or BLUE) can be enabled at any time, enforced by internal priority logic (GREEN > BLUE > RED). Overlapping control signals are resolved automatically, and the device includes blanking intervals of 5–35 µs between channel transitions to allow VOUT stabilization. This architecture is fundamental to its efficiency advantage and is explicitly stated in the "SEQUENTIAL MODE RGB TIMING" and "PRIORITIES OF LED CONTROL SIGNALS" sections of the datasheet.
How is LED current programmed on the LM3435SQX/NOPB?
LED current on the LM3435SQX/NOPB is programmed through two complementary methods: (1) coarse setting via external resistors (RIREFR, RIREFG, RIREFB) connected to pins 8, 6, and 7 respectively, establishing nominal current ranges (e.g., 1.5 A at RIREF = 16.5 kΩ); and (2) fine adjustment via I²C-accessible 10-bit registers (00h–02h), enabling real-time scaling from code 001h (≈0.0012 A) to 3FFh (full scale). Both methods are required for full control-the resistor sets the reference, and the register scales it. This dual-stage programming is detailed in the "HIGH CURRENT REGULATORS" section and Electrical Characteristics table.
What protection features does the LM3435SQX/NOPB include?
The LM3435SQX/NOPB integrates peak current limit protection (6–8.5 A) on the main MOSFET, thermal shutdown at 163°C with 20°C hysteresis, and per-channel open/short LED fault detection. Open faults trigger when VOUT saturates near 4.7 V above VIN; short faults trigger when VOUT fails to rise above 1.5 V above VIN. Both are reported via the open-drain FAULT pin and I²C register 05h, and can be cleared by a sub-100 ns EN pulse or I²C write. These protections are verified in the Absolute Maximum Ratings, Electrical Characteristics, and "LED OPEN/SHORT FAULT REPORTING" sections.
Is the LM3435SQX/NOPB pin-compatible with other Texas Instruments RGB drivers?
No, the LM3435SQX/NOPB is not pin-compatible with other Texas Instruments RGB drivers such as the TLC59284 or TPS61165. Its 40-pin WQFN layout, signal assignment (e.g., dedicated CR/CB/CG soft-start pins, RLED/GLED/BLED cathode outputs, and VOUT-referenced RT pin), and integrated flyback architecture are unique to the LM3435 family. The datasheet provides no cross-reference or migration path indicating mechanical or electrical compatibility. Substitution requires full PCB redesign and firmware adaptation due to differences in control interface, power topology, and fault signaling.
LM3435SQX/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)
LM3435SQX/NOPB FAQ
1.How can I place an order for LM3435SQX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3435SQX/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 LM3435SQX/NOPB reliable?
The price and inventory of LM3435SQX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM3435SQX/NOPB is usually 5 days.
3.What payment methods are accepted for LM3435SQX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3435SQX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3435SQX/NOPB?
LM3435SQX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3435SQX/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 LM3435SQX/NOPB?
For technical support, including LM3435SQX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3435SQX/NOPB requirements.
6.How does Aetrix verify that LM3435SQX/NOPB is sourced from the original manufacturer or authorized distributors?
All LM3435SQX/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 LM3435SQX/NOPB meets industry standards.
7.What is the process for return or replacement of LM3435SQX/NOPB?
All LM3435SQX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM3435SQX/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 LM3435SQX/NOPB part is unused and in its original packaging.
Return procedure for LM3435SQX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM3435SQX/NOPB Tags
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