LM3503ITL-35 - Dual 750mA LED Driver | Texas Instruments
部品番号: LM3503ITL-35 ✓ 生産中LM3503ITL-35 概要
An LED driver is a specialized power-management integrated circuit that converts a supply into the controlled current required by one or more LEDs. A constant-current LED driver regulates output current rather than voltage because LED brightness and reliability depend strongly on current. The boost topology supports LED strings whose forward-voltage requirement exceeds the available input voltage. Within the power-management hierarchy, the LM3503ITL-35 is an LED driver, which is a DC-DC regulator specialized for illumination loads.
The verified data identifies two outputs, constant-current operation, analog brightness control, and PWM dimming as defining features. The switch rating of 750 mA provides a concrete current benchmark when sizing the converter, while the 800 kHz to 1.2 MHz frequency span places the device in a compact, high-frequency backlight-driver class. These features suit displays requiring separate illumination levels or coordinated dual-channel backlighting. Additional electrical limits, LED quantities, efficiency values, and dimming ratios were not supplied and therefore require verification in the manufacturer datasheet.
The device combines a boost-converter function with dedicated constant-current LED regulation. Its two-output architecture reduces the number of separate lighting channels required on a compact display PCB. Analog brightness control provides a direct brightness-control path, while PWM dimming supports display illumination modulation. The small surface-mount package is appropriate for space-constrained portable equipment, but the exposed-pad connection, assembly requirements, thermal limits, and maximum power dissipation must be handled according to the official board-layout guidance.
Typical uses include LCD module backlighting, dual-display portable equipment, tablet or instrument-panel illumination, and compact consumer products with two white-LED strings. For a portable system, the LM3503ITL-35 can generate the required LED current from a lower input voltage when configured as a boost converter. The designer must still confirm that the input source, inductor, diode, capacitors, feedback settings, and LED forward voltages support the intended strings.
The principal design task is validating the verified 750 mA switch rating against actual LED-string current and thermal conditions. Component selection must account for startup behavior, switching losses, inductor saturation current, and layout inductance. Because detailed threshold, timing, and absolute-maximum data are unavailable in the supplied excerpts, consult the manufacturer datasheet before release to production.
This page consolidates verified distributor specifications, sourcing information, replacement constraints, and practical design guidance. It also distinguishes confirmed electrical facts from parameters that still need manufacturer-documentation confirmation.
ドロップイン代替品: LM3503ITL-35 — 同一パッケージでピン互換。PCBの作り直しが必要な異なるパッケージの部品は除外されています。
この製品に利用可能なドロップイン代替品はありません。
代替品をリクエストLM3503ITL-35 最大定格＆電気的特性
| Primary Device Type | Backlight LED driver |
| LED Type | White LED |
| 出力数 | 2 outputs |
| Current Regulation | Constant current |
| Converter Topology | PWM step-up boost |
| スイッチング周波数 | 800 kHz to 1.2 MHz |
| Switch Current Rating | 750 mA |
| Dimming Control | Analog brightness control and PWM dimming |
| 出力電圧 | Up to 35 V |
| Technical Supply Voltage | 5.5 V maximum |
| Regulator Function | DC-DC regulator |
| Package Type | 10-pin micro-SMD |
| Package Dimensions | 1.9 mm x 2.07 mm |
| 実装タイプ | Surface mount |
| Supplier Order Suffix | /NOPB |
LM3503ITL-35 1.9 mm x 2.07 mm ピン配置ガイド
LM3503ITL-35 (1.9 mm x 2.07 mm パッケージ) のピン配置。 このパワーデバイスは、ゲート、ドレイン、ソース端子を備えています。非極性パッケージの場合、正確なピン1の向きとフットプリントの詳細については、メーカーのデータシートを参照してください。主な用途には、電源設計、モータ駆動、負荷スイッチングがあります。
詳細なピン配置データはありません: LM3503ITL-35.
詳細は データシート をご参照ください。
主な用途
LM3503ITL-35 の用途: 6 件s: Dual-Display Backlighting, Portable Tablet Lighting, Instrument-Panel Illumination, Battery-Powered Diagnostic Displays, Compact Test-and-Measurement Displays, Automotive-Style Dual Displays.
Dual-Display Backlighting
The LM3503ITL-35 fits dual-display backlighting because the verified device provides two constant-current outputs, analog brightness control, and PWM dimming in one 10-pin micro-SMD package. Place it behind the display's two LED strings and use the boost stage when the LED-string voltage exceeds the available rail. Its 800 kHz-to-1.2 MHz operating range supports compact high-frequency power conversion, while the 750 mA switch rating establishes a clear sizing benchmark. Confirm actual channel current, startup behavior, thermal dissipation, and both LED-string voltages in the manufacturer datasheet before committing the PCB layout.
Portable Tablet Lighting
The LM3503ITL-35 is appropriate for portable tablet lighting when the product uses two white-LED backlight channels and needs independent brightness adjustment in a small board area. Analog brightness control can establish an initial illumination level, while PWM dimming can modulate display brightness. Its two-output boost-driver topology reduces the component count compared with using unrelated regulators for each display channel. The package is approximately 1.9 mm by 2.07 mm, but battery current, converter efficiency, display-string voltage, and allowable light flicker still require application-specific validation as of 2026-10-23.
Instrument-Panel Illumination
The LM3503ITL-35 can support instrument-panel or control-display illumination when two LED arrays need controlled current from a shared boost-driver IC. Constant-current regulation is preferable to uncontrolled voltage drive because it makes LED operating current more repeatable. PWM dimming provides a usable modulation method, and the verified two-output organization simplifies channel management. Before deployment, compare the 750 mA switch rating against normal, maximum, and startup loads, then verify inductor saturation margin, diode reverse voltage, capacitor ripple current, and junction-temperature limits from the official documentation.
Battery-Powered Diagnostic Displays
The LM3503ITL-35 fits battery-powered diagnostic equipment that uses two display backlights and needs adjustable illumination across changing operating conditions. The boost architecture can raise a battery-derived input to the LED-string voltage, while constant-current control limits the primary brightness variable. Analog brightness control supports a continuous level command, and PWM dimming offers an alternate pulse-width-controlled path. The design remains constrained by available battery voltage and heat: high conversion ratios or sustained maximum current can reduce efficiency and raise component temperature, so both operating modes must be evaluated rather than relying only on the 750 mA switch figure.
Compact Test-and-Measurement Displays
The LM3503ITL-35 is suitable for compact test-and-measurement products with two illuminated display windows. Integrating both constant-current channels into a 10-pin micro-SMD device can simplify control and conserve board area compared with separate single-channel drivers. PWM dimming can support user-adjustable brightness, while analog brightness control can initialize or continuously command illumination. Because measurement displays may combine low and high brightness extremes, check minimum on-time, visible flicker, LED current accuracy, and loop stability using the manufacturer guidance; those timing and modulation values were not present in the supplied excerpts.
Automotive-Style Dual Displays
The LM3503ITL-35 can serve as a candidate for dual illuminated displays in vehicle-oriented equipment, but automotive qualification cannot be assumed from the available data. Its two constant-current outputs, analog brightness control, PWM dimming, and boost-converter operation align functionally with multi-display backlighting. Before using it in a safety- or production-critical automotive design, verify temperature range, transient tolerance, vibration handling, AEC-Q100 status, lamp-flicker requirements, and fail-safe behavior. None of those qualification details was supplied, so this use remains conditional rather than a claim of automotive readiness.
エンジニアリング参考データ: LM3503ITL-35 — 比較、設計ガイダンス、コンプライアンス情報。
選定ガイド
代替品との比較
| パラメータ | この製品 |
|---|---|
| Brand | Texas Instruments |
| Package | 10-pin micro-SMD, 1.9 mm x 2.07 mm |
| Number of Outputs | 2 |
| Switch Current Rating | 750 mA |
| Switching Frequency | 800 kHz to 1.2 MHz |
| Output Voltage | Up to 35 V |
| Technical Supply Voltage | 5.5 V maximum |
| Brightness Control | Analog brightness control and PWM dimming |
主な差別化要因
- Integration for two backlight channels （vs Generic single-channel boost LED driver)
- Two brightness-control methods （vs Dimmable single-output driver with PWM only)
- Documented switch-current benchmark （vs Unspecified low-power LED-backlight controller)
設計ノート
Begin with an input-voltage and LED-string voltage budget before selecting external power components. Because the LM3503ITL-35 uses boost conversion and has an output rating up to 35 V, the input source must still support the required duty cycle and startup demand. Treat the verified 750 mA switch rating as a device rating, not an unconditional output-current command. Confirm actual LED current, worst-case input current, converter efficiency, inductor saturation current, diode reverse-voltage margin, and output-capacitor ripple rating against the manufacturer datasheet.
Keep the high-current boost-loop path compact because its 800 kHz-to-1.2 MHz switching range leaves little margin for oversized PCB inductance. Place the switching node over as little copper area as practical, keep high-di/dt loops short, and follow the manufacturer's recommended component placement and grounding arrangement. The supplied data does not provide a definitive exposed-pad or thermal-via pattern, so use the official package drawing and layout example instead of inferring one from distributor package dimensions.
Do not substitute the LM3503ITL-35/NOPB ordering code for a separately verified electrical equivalent or assume that any two-output LED driver is pin compatible. The verified data does not disclose a complete pin map, absolute maximum ratings, PWM timing, or dimming ratios. Prototype only after checking every package terminal, both output-channel settings, startup behavior, shutdown behavior, and fault tolerance in the manufacturer datasheet. Record LED current across temperature as part of production validation.
コンプライアンス情報
The supplied distributor and datasheet-index records do not provide explicit RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals statements. Compliance must be confirmed from the current manufacturer product documentation before qualification.
