Texas Instruments LM3410YSD/NOPB

Overview

LM3410YSD/NOPB from Texas Instruments is a constant-current, 525-kHz PWM boost/SEPIC LED driver IC with internal NMOS switch (170 mΩ), 190-mV feedback reference, and integrated compensation. It operates from 2.7 V to 5.5 V input, delivers up to 24 V output, and regulates LED current via external sense resistor-used in handheld LED backlighting and automotive interior lighting.

For engineers reviewing the LM3410YSD/NOPB datasheet, LM3410YSD/NOPB pinout, LM3410YSD/NOPB application, or LM3410YSD/NOPB equivalent, key selection factors include its fixed 525-kHz switching frequency, thermal shutdown (165°C), ultra-low 80-nA shutdown current, and SOT-23-5 package compatibility with space-constrained portable designs.

Technical Context

The LM3410YSD/NOPB implements current-mode PWM control with internal slope compensation and cycle-by-cycle current limiting (2.8-A typical peak). Its error amplifier compares FB voltage against a 190-mV internal reference to adjust duty cycle and maintain constant LED current.

It supports both boost and SEPIC topologies using external inductor, diode, and capacitors. The DIM pin accepts 0–100% PWM signals (1 Hz–25 kHz) for analog/digital dimming, while UVLO (2.65 V rising) and thermal shutdown (165°C) provide robust fault protection.

Key Specifications

Pinout & Package

LM3410YSD/NOPB uses the 5-pin SOT-23 package (3.00 mm × 3.00 mm), optimized for low-profile, high-density LED driver layouts. Thermal performance relies on proper GND pad layout and minimal trace inductance on SW and VIN paths.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar constant-current LED driver applications.

Compared with LM3410YSD/NOPB, LM3410XSD/NOPB trades efficiency for smaller magnetics, while TPS61061DRVR increases design complexity and reduces current accuracy-making LM3410YSD/NOPB optimal for cost-sensitive, space-limited 525-kHz LED driver implementations.

Availability

LM3410YSD/NOPB is available at Aetrix Electronics and suitable for smartphone backlighting, automotive interior lighting, and portable medical display applications requiring stable component supply, automotive-grade reliability, and long-term production continuity.

Supply support for LM3410YSD/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 specializing in analog and embedded processing technologies, with leadership in power management, signal chain, and high-reliability ICs.

The LM3410 product line delivers highly integrated, thermally robust LED drivers for portable and automotive lighting-designed to simplify system design while meeting AEC-Q100 Grade 1 requirements.

FAQ

What is the maximum output voltage supported by the LM3410YSD/NOPB?

The LM3410YSD/NOPB supports output voltages up to 24 V, as specified in its recommended operating conditions. This limit ensures safe operation of the internal 170-mΩ NMOS switch and maintains stability in boost and SEPIC configurations. Exceeding 24 V risks violating absolute maximum ratings and may trigger thermal shutdown or damage the device. Always verify output voltage margin against LED string forward voltage plus diode drop in final layout.

How does the DIM pin function in the LM3410YSD/NOPB?

The DIM pin on the LM3410YSD/NOPB serves dual functions: logic enable and PWM dimming input. A voltage ≥1.8 V enables operation; below 0.4 V disables the device with 80-nA quiescent current. For dimming, a 0–100% PWM signal (1 Hz–25 kHz) applied to DIM directly modulates average LED current without altering the internal current regulation loop. TI recommends 200–1000 Hz for best dimming linearity at low brightness levels.

Can the LM3410YSD/NOPB drive multiple parallel LED strings?

No-the LM3410YSD/NOPB is designed for single-string constant-current regulation using a single sense resistor (R_SET) referenced to FB. Driving parallel LED strings would cause current imbalance due to V_F mismatch, risking overcurrent in lower-V_F strings. For multi-string applications, separate LM3410YSD/NOPB channels or a matrix driver IC with individual current sinks is required to ensure uniform brightness and reliability.

What thermal considerations apply to the LM3410YSD/NOPB in SOT-23-5 package?

The LM3410YSD/NOPB in SOT-23-5 has a junction-to-ambient thermal resistance (R_θJA) of 164.2°C/W under natural convection. To avoid thermal shutdown at 165°C, keep power dissipation below 400 mW-achievable by limiting peak switch current, optimizing PCB copper area under the exposed pad, and using thermal vias to inner ground planes. Layout must minimize SW and VIN trace inductance to reduce switching losses that elevate die temperature.

Is the LM3410YSD/NOPB suitable for SEPIC topology applications?

Yes-the LM3410YSD/NOPB supports SEPIC configuration per TI's Application Note SNVS541H, enabling output voltages both above and below input (e.g., 2.7–4.5 V Li-ion input to 3.3 V OLED supply). Unlike boost-only operation, SEPIC avoids polarity inversion and handles input dips without dropout. Implementation requires two inductors, two capacitors, and modified feedback placement-but retains all LM3410YSD/NOPB protections including current limit and thermal shutdown.