LM3502ITL-25 - 600mA Dual White LED Boost Driver | Texas Instruments
MPN: LM3502ITL-25 ✓ ActiveLM3502ITL-25 Overview
A boost LED driver is a DC-DC converter in the power-management and LED-driver hierarchy. It regulates current through one or more white-LED strings whose forward voltage rises as more LEDs are connected in series. This LM3502 provides two output channels, cycle-by-cycle current limiting, over-voltage protection, and under-voltage protection without external compensation, according to the supplied National Semiconductor datasheet material. Those protections help a display backlight remain controlled during output overvoltage or startup abnormalities.
Key verified features include two outputs, PWM dimming, step-up boost topology, 600 mA switch current, and an 800 kHz to 1.2 MHz operating-frequency range. Its dual-output architecture is useful when a display needs independent LED strings or when one large string is arranged as two driven sections. The high switching-frequency range supports compact magnetics and capacitors, although actual component sizing requires the complete datasheet and the intended LED-string voltage and current.
The device operates as a switched power converter rather than a linear regulator, so its efficiency and thermal behavior depend on input voltage, output voltage, LED current, switching losses, inductor selection, diode selection, and PCB layout. A boost stage increases voltage and transfers energy through an inductor; therefore, output voltage must be checked against the absolute-maximum and protection limits in the manufacturer datasheet before a board is released.
Typical applications include portable-display backlighting, dual-display white-LED illumination, and large single-string LCD backlighting. In a portable system, PWM dimming permits brightness adjustment without changing the LED-string current set point. In a dual-display arrangement, the two outputs can serve matched backlight sections, but channel independence, dimming behavior, and fault response must be verified against the full datasheet.
A key design requirement is to follow the manufacturer’s inductor, Schottky-diode, compensation, and capacitor recommendations exactly. Keep the switching loop small, provide low-impedance input and ground paths, and verify ripple, startup, dimming frequency, and thermal performance on the target display load. This page combines verified distributor specifications, sourcing information, and practical application guidance beyond a basic distributor listing.
Drop-in alternatives for LM3502ITL-25 — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
No drop-in alternatives available for this product.
Request AlternativesLM3502ITL-25 Maximum Ratings & Electrical Characteristics
| Product Type | Dual-output white LED driver |
| Topology | Step-up boost converter |
| Number of Outputs | 2 outputs |
| Dimming Method | PWM dimming |
| Switch Current | 600 mA |
| Switching Frequency Range | 800 kHz to 1.2 MHz |
| LED Application | White LED backlighting |
| Package | 10-MicroSMD (1.9 mm x 2.07 mm) |
| Mounting Type | Surface mount |
| External Compensation | Not required |
| Current Limit | Cycle-by-cycle current limit |
| Overvoltage Protection | Provided |
| Undervoltage Protection | Provided |
| Primary Application | Dual-display or large single-string backlighting |
LM3502ITL-25 10-microsmd (1.9 mm x 2.07 mm) Pin Configuration Guide
Pin configuration for LM3502ITL-25 (10-microsmd (1.9 mm x 2.07 mm) package). This power device features gate, drain, and source terminals. For non-polarized packages, refer to the manufacturer datasheet for exact pin 1 orientation and footprint details. Common applications include power supply design, motor driving, and load switching.
No detailed pinout data available for LM3502ITL-25.
Refer to the datasheet for full pin configuration.
Typical Applications
LM3502ITL-25 is suitable for 6 applications: Portable Display Backlighting, Dual-Display White LED Backlighting, Large Single-String LED Backlight, Battery-Powered Display Lighting, Industrial Control-Panel Illumination, Display Test and Calibration Systems.
Portable Display Backlighting
The LM3502ITL-25 fits portable-display backlighting because it combines a step-up converter, two outputs, PWM dimming, and a verified 600 mA switch-current rating in 10-MicroSMD. Place the driver at the display power connector and use the two channels for matched LED-string sections. PWM adjustment changes the perceived brightness without redesigning the LED current target. The compact package supports space-constrained handheld equipment, while the 800 kHz to 1.2 MHz switching range enables small magnetic and capacitor selections. Verify input range, output headroom, LED forward voltage, dimming frequency, and thermal performance against the complete datasheet.
Recommended
Dual-Display White LED Backlighting
The LM3502ITL-25 is identified for dual-display white-LED backlighting and provides two outputs from one boost-driver package. The channels can supply separately routed display strings when the board designer confirms the required current, voltage, dimming polarity, and fault behavior from the full datasheet. Its 600 mA switch rating and 800 kHz to 1.2 MHz operating range provide a concrete starting point for converter sizing. Compared with two unrelated single-channel drivers, one dual-output IC reduces duplicated control circuitry, but channel-to-channel accuracy and tolerance must still be validated on production hardware.
Recommended
Large Single-String LED Backlight
The LM3502ITL-25 can drive a large single white-LED backlight string through its step-up topology and dual-output architecture. A large string presents a higher forward-voltage requirement than a short string, so the available supply voltage and maximum output voltage determine whether one channel or both channels are appropriate. The switching regulator’s verified 600 mA rating applies to the switch current and must be reconciled with the actual LED load and inductor limits. Prototype the selected inductor, Schottky diode, and capacitor network across minimum and maximum backlight conditions before production.
Recommended
Battery-Powered Display Lighting
A battery-powered display benefits from the LM3502ITL-25’s integrated step-up function because the LED string can require more voltage than the available battery rail. PWM dimming provides a direct brightness-control method while the regulator manages energy delivery through the boost stage. The 800 kHz to 1.2 MHz switching range can support compact magnetics, but converter efficiency is strongly dependent on the input-to-output voltage ratio and selected components. Measure battery-range efficiency, standby behavior, and thermal rise rather than assuming nominal backlight operation covers every battery condition.
Recommended
Industrial Control-Panel Illumination
The LM3502ITL-25 is suitable for control-panel or instrument-display backlighting when its voltage and current limits match the selected LED string. The two outputs support matched illumination areas, while PWM dimming allows brightness to follow ambient or user conditions. For industrial equipment, verify operating-temperature limits, enclosure temperature rise, input transients, and LED aging effects before committing the design. The verified protections—cycle-by-cycle current limit, over-voltage protection, and under-voltage protection—add useful fault control, but enclosure grounding and board cleanliness still require system-level design.
Recommended
Display Test and Calibration Systems
The LM3502ITL-25 can serve as the white-LED power and dimming element in a display test fixture where repeatable brightness control is needed. Its two outputs allow a fixture to illuminate matched display regions, while PWM dimming supports multiple test levels and visual comparisons. For instrumentation applications, measure the LED current, switching waveform, output ripple, and dimming ratio rather than relying only on brightness appearance. The verified 600 mA switch-current figure and 800 kHz to 1.2 MHz range provide the principal electrical checkpoints for fixture component selection.
Recommended
Recommended Products Summary
Engineering reference data for LM3502ITL-25 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product |
|---|---|
| Package | 10-MicroSMD (1.9 mm x 2.07 mm) |
| Brand | Texas Instruments |
| Number of Outputs | 2 outputs |
| Topology | Step-up boost converter |
| Dimming Method | PWM dimming |
| Switch Current | 600 mA |
| Switching Frequency | 800 kHz to 1.2 MHz |
| External Compensation | Not required |
| Current-Limit Protection | Cycle-by-cycle current limit |
| Application | White LED display backlighting |
Key Differentiators
- Dedicated dual-output architecture (vs Generic single-channel white-LED boost drivers)
- Integrated switching-current capability (vs Lower-current LED-driver alternatives)
- PWM dimming and boost operation in one IC (vs Discrete boost plus external dimming control)
- Compact surface-mount integration (vs Larger-package LED power solutions)
Design Notes
Use the exact 10-MicroSMD land pattern and exposed-pad guidance from the manufacturer package drawing. Keep the input capacitor, switching node, inductor, Schottky diode, and output capacitor in a compact loop, and provide a low-impedance ground path. The supplied search confirms the 1.9 mm by 2.07 mm package dimensions but does not provide the ball map, so do not infer exposed-pad connectivity from the package name.
Calculate the inductor and diode ratings from the maximum LED-string voltage, 600 mA switch-current class, expected ripple, and permitted duty cycle. Check the absolute maximum output voltage and overvoltage-protection behavior in the complete datasheet before selecting a diode or capacitor voltage rating. The switching-frequency range of 800 kHz to 1.2 MHz can reduce magnetic size, but it does not by itself guarantee efficiency.
Route the high-current switch node as short and compact as possible because fast dV/dt increases electromagnetic radiation and ringing. Place the feedback or current-sense path away from the switching node and inductor, and use a quiet ground reference for control circuitry. Validate PWM dimming edges with an oscilloscope at the actual LED-string operating point; static layout rules alone do not reveal timing or stability problems.
Do not treat the -25 suffix, NOPB ordering code, or the existence of a distributor page as proof of identical electrical behavior without consulting the manufacturer ordering table. Likewise, do not assume a generic white-LED driver is a replacement: the target has two outputs, PWM dimming, 10-MicroSMD packaging, and a verified 600 mA switch-current specification. Verify pinout, voltage limits, timing, and fault response before substitution.
Compliance Information
The supplied search results do not provide verified RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals statements. AEC-Q100 is treated as not_applicable because the part is presented as a display LED driver, not an automotive-qualified device in the supplied data.
