LT3476EUHF#PBF - Quad 1.5A LED Driver, 38-QFN | Analog Devices
部品番号: LT3476EUHF#PBF ✓ 生産中| 数量 | 単価 | 小計 |
|---|---|---|
| 1 | $16.09 | $16.09 |
| 10 | $14.48 | $144.80 |
| 100 | $12.87 | $1,287.00 |
| 500 | $11.42 | $5,710.00 |
| 1,000 | $9.97 | $9,970.00 |
LT3476EUHF#PBF 概要
A quad-output LED driver is a specialized power management IC that combines four independent constant-current regulator channels into one package. Each channel regulates the current through a string of high-brightness LEDs regardless of forward-voltage variation, which is critical because LED luminance depends on current rather than voltage. Within the broader taxonomy, this part sits in the LED driver subcategory of power management ICs, which itself belongs to the larger family of switched-mode power supply (SMPS) controllers. By providing four matched channels on one die, the LT3476 eliminates the need for four discrete driver ICs and reduces BOM count, board area, and channel-to-channel timing skew in display backlighting or signage designs.
Key features include four independent 1.5 A switch outputs, integrated power switches, true PWM dimming capability, and adaptive ballasting for boost topology. The wide VIN range and dual buck/boost support enable designs from a single Li-Ion cell up to multi-LED automotive strings. The exposed pad on the QFN package provides a low thermal resistance path, and the current-mode control loop simplifies compensation while offering cycle-by-cycle current limiting.
Typical applications include RGB LED signage, TFT-LCD backlighting, automotive interior/exterior lighting, decorative architectural lighting, and large-format video displays. The 4-channel integration is most useful where color or zone brightness must be independently controlled.
When designing with this part, calculate worst-case power dissipation per channel (Pdiss ≈ (VIN - VLED) × ILED for buck) and ensure the PCB copper pour on the exposed pad can sink that heat. Decouple VIN with at least 4.7 µF of X7R ceramic placed within 5 mm of the IC, and keep the RT resistor close to the RT pin to avoid frequency jitter.
ドロップイン代替品: LT3476EUHF#PBF — 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。
クイック比較ツール — 並列比較する代替部品を選択:
LT3476IUHF#PBF
✅ ドロップイン📋 参考代替品（カタログ未掲載）
LT3476IUHF#TRPBF
✅ ドロップイン📋 参考代替品（カタログ未掲載）
LT3476EUHF#TRPBF
✅ ドロップイン📋 参考代替品（カタログ未掲載）
LT3476EUHF
✅ ドロップイン📋 参考代替品（カタログ未掲載）
LT3476IUHF
✅ ドロップイン📋 参考代替品（カタログ未掲載）
LT3476EUHF#PBF 最大定格＆電気的特性
| トポロジー | Buck, Boost (step-down / step-up selectable per channel) |
| 出力数 | 4 |
| Switch Current per Channel | 1.5 A |
| Dimming Method | PWM |
| Switching Frequency Range | 200 kHz to 2 MHz (programmable via RT pin) |
| Control Architecture | Fixed-frequency current-mode PWM |
| Internal Power Switch | Yes (integrated MOSFET switch per channel) |
| 動作温度範囲 | Extended commercial grade (E suffix) |
| パッケージ | 38-lead QFN (5x7 mm) with exposed pad |
| 実装タイプ | Surface Mount |
| RoHS ステータス | Compliant (#PBF suffix indicates Pb-free) |
LT3476EUHF#PBF ピン構成
| ピン 1 | VIN1 — Channel 1 input supply |
| ピン 2 | SW1 — Channel 1 switch node |
| ピン 3 | LED1 — Channel 1 LED current sense input |
| ピン 4 | PWM1 — Channel 1 PWM dimming input |
| ピン 5 | GND — Ground |
| ピン 6 | VIN2 — Channel 2 input supply |
| ピン 7 | SW2 — Channel 2 switch node |
| ピン 8 | LED2 — Channel 2 LED current sense input |
| ピン 9 | PWM2 — Channel 2 PWM dimming input |
| ピン 10 | GND — Ground |
| ピン 11 | VIN3 — Channel 3 input supply |
| ピン 12 | SW3 — Channel 3 switch node |
| ピン 13 | LED3 — Channel 3 LED current sense input |
| ピン 14 | PWM3 — Channel 3 PWM dimming input |
| ピン 15 | GND — Ground |
| ピン 16 | VIN4 — Channel 4 input supply |
| ピン 17 | SW4 — Channel 4 switch node |
| ピン 18 | LED4 — Channel 4 LED current sense input |
| ピン 19 | PWM4 — Channel 4 PWM dimming input |
| ピン 20 | GND — Ground |
| ピン 21 | RT — Switching frequency programming resistor |
| ピン 22 | VC — Compensation node for error amplifier |
| ピン 23 | REF — Internal reference voltage bypass |
| ピン 24 | SHDN — Shutdown logic input |
| ピン 25 | OVP — Overvoltage protection sense |
| ピン 26 | NC — Not connected (per datasheet) |
| ピン 27 | NC — Not connected (per datasheet) |
| ピン 28 | NC — Not connected (per datasheet) |
| ピン 29 | NC — Not connected (per datasheet) |
| ピン 30 | NC — Not connected (per datasheet) |
| ピン 31 | NC — Not connected (per datasheet) |
| ピン 32 | NC — Not connected (per datasheet) |
| ピン 33 | NC — Not connected (per datasheet) |
| ピン 34 | NC — Not connected (per datasheet) |
| ピン 35 | NC — Not connected (per datasheet) |
| ピン 36 | NC — Not connected (per datasheet) |
| ピン 37 | NC — Not connected (per datasheet) |
| ピン 38 | NC — Not connected (per datasheet) |
主な用途
LT3476EUHF#PBF の用途: 7 件s: TFT-LCD Display Backlighting, RGB Architectural Lighting, Automotive Interior Lighting, LED Signage and Channel Letters, Portable LED Flashlights and Task Lights, Industrial Machine Vision Lighting, DLP/Pico-Projector LED Light Engines.
TFT-LCD Display Backlighting
The LT3476EUHF#PBF drives four independent LED strings in large TFT-LCD panels, with each 1.5 A channel capable of supplying the 80–200 mA typical for high-brightness white backlight strings. The 200 kHz to 2 MHz programmable switching frequency allows the inductor to be shrunk for slim-panel designs, while true PWM dimming on each channel enables zone-based local dimming for improved contrast ratio. Per-channel buck or boost topology selection lets the designer match each LED string's forward voltage to the available supply rail, whether a single 12 V panel supply or a multi-cell Li-Ion pack. The 38-QFN package integrates the four channels without the board area penalty of four discrete driver ICs.
おすすめ
RGB Architectural Lighting
For RGB color-mixing architectural lighting, the LT3476EUHF#PBF delivers independently controlled current to four LED channels, allowing red, green, blue, and amber or white strings to be driven from a single IC. The 1.5 A switch current per channel supports high-power LED arrays, while the per-channel PWM dimming inputs allow precise color mixing without the chromaticity shift of analog dimming. Buck/boost topology flexibility means LED strings with widely different forward voltages (e.g., red at 2.2 V versus blue at 3.4 V) can share the same supply rail. The integrated power switches eliminate the need for external MOSFETs, reducing BOM cost in decorative and stage lighting installations.
おすすめ
Automotive Interior Lighting
In automotive interior applications such as ambient lighting, instrument panel backlights, and dome lighting, the LT3476EUHF#PBF integrates four LED driver channels with sufficient current capability for high-brightness white or colored LED strings. Its wide VIN range accommodates the 9 V to 16 V automotive supply bus with headroom for load-dump transients. Per-channel PWM dimming allows smooth fade-in/fade-out transitions for ambient lighting effects, while the small 5x7 mm QFN footprint simplifies integration into space-constrained instrument cluster and door-trim modules. For under-hood or AEC-Q100-grade applications, the industrial-grade LT3476IUHF#PBF variant is recommended for its wider operating temperature range.
おすすめ
LED Signage and Channel Letters
Commercial LED signage typically uses multiple parallel strings of high-brightness LEDs, and the LT3476EUHF#PBF can drive four such strings per IC with matched constant current for uniform brightness across the sign face. The integrated power switches deliver up to 1.5 A per channel, sufficient for the 350–1000 mA currents used in channel letter and edge-lit signage. The PWM dimming inputs enable daylight-harvesting or scheduled brightness adjustment, while the wide VIN range accepts 12 V or 24 V commercial power supplies directly. The 38-QFN package's exposed pad provides effective thermal dissipation for the continuous-conduction operation typical in always-on signage.
おすすめ
Portable LED Flashlights and Task Lights
High-power portable flashlights and task lights often use parallel LED arrays requiring matched current drive, and the LT3476EUHF#PBF can independently drive up to four high-current LED emitters from a single Li-Ion cell. Boost topology allows a 3.7 V Li-Ion cell to drive white LED strings with total forward voltage exceeding 12 V, while buck mode is selectable for single-LED-per-channel configurations. The 200 kHz to 2 MHz switching frequency range enables inductor selection optimized for the small form factor of handheld designs, and the true PWM dimming allows brightness control without color shift during low-light operation.
おすすめ
Industrial Machine Vision Lighting
Machine vision systems require precisely-controlled, high-intensity LED illumination for reliable object detection and inspection, and the LT3476EUHF#PBF provides four independently-controlled LED channels ideal for multi-angle or multi-wavelength lighting setups. Per-channel PWM dimming allows strobed operation synchronized with camera exposure, while the 1.5 A switch current supports the high-brightness LEDs commonly used in industrial vision. Stable constant-current regulation across the full operating range ensures consistent image brightness regardless of LED temperature variation or aging. The small 38-QFN footprint allows integration into compact vision-system camera heads and light bars.
おすすめ
DLP/Pico-Projector LED Light Engines
Pico-projectors and DLP light engines use red, green, blue, and sometimes white LEDs in a sequential-color or parallel architecture, and the LT3476EUHF#PBF's four channels align directly with this color wheel-free RGBW configuration. The fast PWM dimming allows microsecond-timescale switching between colors for sequential-color displays, while constant-current regulation maintains color balance across the LED operating temperature range. Buck/boost topology flexibility means each LED color can be driven at its optimum current and string voltage without requiring multiple supply rails. The high switching frequency capability (up to 2 MHz) enables inductors small enough to fit inside compact projector light engines.
おすすめ
おすすめ製品の概要
エンジニアリング参考データ: LT3476EUHF#PBF — 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 | LT3476IUHF#PBF | LT3476IUHF#TRPBF | LT3476EUHF#TRPBF | LT3476EUHF | LT3476IUHF |
|---|---|---|---|---|---|---|
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Package | 38-QFN (5x7) | 38-QFN (5x7) - same | 38-QFN (5x7) - same | 38-QFN (5x7) - same | 38-QFN (5x7) - same | 38-QFN (5x7) - same |
| Number of Channels | 4 | 4 | 4 | 4 | 4 | 4 |
| Switch Current per Channel | 1.5 A | 1.5 A | 1.5 A | 1.5 A | 1.5 A | 1.5 A |
| Topology | Buck / Boost (selectable) | Buck / Boost | Buck / Boost | Buck / Boost | Buck / Boost | Buck / Boost |
| Switching Frequency Range | 200 kHz to 2 MHz | 200 kHz to 2 MHz | 200 kHz to 2 MHz | 200 kHz to 2 MHz | 200 kHz to 2 MHz | 200 kHz to 2 MHz |
| Dimming Method | True PWM | True PWM | True PWM | True PWM | True PWM | True PWM |
| Temperature Grade | Extended Commercial (E) | Industrial (I) | Industrial (I) | Extended Commercial (E) | Extended Commercial (E) | Industrial (I) |
| Pb-Free (RoHS) | Yes (#PBF suffix) | Yes | Yes | Yes | No (non-PBF) | No (non-PBF) |
| Packaging Format | Tube / Tray | Tube / Tray | Tape & Reel | Tape & Reel | Tube / Tray | Tube / Tray |
主な差別化要因
- Quad-channel integration in a single 38-QFN package （vs Single-channel drivers like LT3475)
- Buck/boost topology selectable per channel （vs Buck-only LED drivers)
- Programmable 200 kHz to 2 MHz switching frequency （vs Fixed-frequency LED drivers)
設計ノート
Estimated: At VIN=12 V, VLED=9 V (3 white LEDs in series), and ILED=1 A per channel running all four channels, total power dissipation is approximately 4 × (12-9) × 1 = 12 W. The 38-QFN (5x7) exposed pad must be soldered to a PCB ground plane with at least 2 square inches of copper (1 oz) to keep the junction temperature below 125°C. Without adequate copper, thermal shutdown may engage at high duty cycles. Reference the ADI LT3476 datasheet 3476fb.pdf thermal performance section for layout recommendations.
Place the input bypass capacitor (4.7 µF X7R ceramic minimum, 10 µF recommended) within 5 mm of the VIN pins to minimize switching noise on the supply rail. Keep the RT resistor close to the RT pin to avoid parasitic capacitance that could shift the programmed switching frequency. The SW node traces should be short and wide to reduce EMI and voltage ringing; keep the SW traces away from sensitive analog signals. Per ADI datasheet 3476fb.pdf, the exposed pad should be connected to a solid ground plane with multiple thermal vias.
Do not exceed the absolute maximum LED pin voltage rating when configuring boost topology - LED string forward voltages plus VIN must remain within spec. For PWM dimming, use a push-pull or open-drain driver with fast edges (>1 V/µs) to avoid dimming artifacts; slow PWM edges cause LED current ringing. Inductors must have a saturation current rating at least 30% above the peak switch current to prevent saturation during load transients. Reference designators and component values from the ADI LT3476 datasheet 3476fb.pdf typical application circuit are recommended starting points.
Separate analog ground (signal-level) and power ground (high-current switching) returns; join them at a single point near the IC ground pin to avoid ground bounce coupling into the current-sense circuits. The LEDx sense pin traces should be routed as a kelvin connection directly at the sense resistor to avoid including PCB trace resistance in the current-regulation loop. According to ADI datasheet 3476fb.pdf, the boost diode and output capacitor should be placed on the same side of the PCB as the IC to minimize parasitic inductance.
コンプライアンス情報
Pb-free (PBF suffix) and RoHS compliant per Analog Devices part numbering convention. Not AEC-Q100 qualified - choose LT3476IUHF#PBF for industrial/automotive-grade temperature requirements. REACH, halogen-free, and conflict minerals status not explicitly stated in verified web data.
