LT3496EUFD - Triple 750mA 45V LED Driver w/ 3000:1 PWM Dimming | Analog Devices
料号： LT3496EUFD ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $8.75 | $8.75 |
| 10 | $7.92 | $79.20 |
| 100 | $6.85 | $685.00 |
| 500 | $6.1 | $3,050.00 |
| 1,000 | $5.45 | $5,450.00 |
LT3496EUFD 概述
A triple-output LED driver is a power-management IC that combines three independently regulated constant-current channels in a single die. Each channel uses hysteretic-mode control to eliminate the compensation-network design effort typical of PWM controllers, while an internal gate driver provides PMOS LED-disconnect logic for true-color PWM dimming. The LT3496EUFD sits within the broader taxonomy of LED drivers -> power management ICs -> mixed-signal semiconductors, and is typically paired with microcontrollers and serial-interface LED controllers for display backlights.
Key specifications include three independent 750mA internal switches rated to 45V, True Color PWM dimming up to a 3000:1 dimming ratio, an integrated PMOS gate driver for LED disconnect during PWM-off intervals, a wide input voltage range suitable for automotive and industrial buses, and adjustable switching frequency. The exposed-pad QFN-28 package provides a low thermal resistance path for dissipating power at full-load conditions across all three channels. According to the manufacturer datasheet, the part supports analog and PWM dimming simultaneously, simplifying implementation of brightness curves in solid-state lighting.
Typical applications include RGB LED backlight drivers for LCD monitors and TVs, automotive interior and exterior lighting, architectural and stage lighting fixtures, signage and decorative LED strips, and battery-powered handheld projectors. The wide VIN range and topology flexibility also support industrial 24V bus designs and emergency-vehicle strobe circuits.
When designing with this device, derate each channel to no more than 500mA continuous in enclosed fixtures with limited airflow, and place the input/output capacitors and the boost diode as close to the IC as the PCB allows. The PWM dimming pin accepts logic-level signals from any microcontroller timer, and the PMOS gate driver must be connected to an external P-channel MOSFET rated for the channel voltage.
This page synthesizes distributor pricing, drop-in alternatives, and practical application guidance beyond what the manufacturer datasheet provides.
直接替换替代料： LT3496EUFD ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
快速对比工具——选择替代料号进行并排对比：
LT3496IUFD
✅ 直接替换📋 参考替代料（不在目录中）
LT3496EUFD#PBF
✅ 直接替换📋 参考替代料（不在目录中）
LT3496EUFD#TRPBF
✅ 直接替换📋 参考替代料（不在目录中）
LT3495EUFD
✅ 直接替换📋 参考替代料（不在目录中）
LT3494EUFD
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
LT3496EUFD 最大额定值与电气特性
| 拓扑 | Step-Down (Buck), Step-Up (Boost), Buck-Boost |
| 输出数量 | 3 |
| Internal Switch Current | 750 mA per channel |
| Internal Switch Voltage Rating | 45 V |
| PWM Dimming Ratio | 3000:1 (True Color PWM) |
| Dimming Method | Analog and PWM |
| PMOS Gate Driver | Built-in for LED disconnect |
| 开关频率 | Adjustable |
| 封装 | 28-QFN (4x5 mm) with exposed pad |
| 安装类型 | Surface Mount |
| 工作温度范围 | -40C to +125C (E grade) |
| RoHS 状态 | Compliant (PBF suffix) |
| Lead-Free | Yes (PBF suffix) |
LT3496EUFD 引脚配置
| 引脚 1 | VIN1 — Input supply for channel 1 |
| 引脚 2 | SW1 — Switch node for channel 1 |
| 引脚 3 | SW1 — Switch node for channel 1 |
| 引脚 4 | GND — Ground |
| 引脚 5 | PWM1 — PWM dimming input for channel 1 |
| 引脚 6 | CTRL1 — Analog dimming / current set for channel 1 |
| 引脚 7 | GATE1 — PMOS gate driver output for channel 1 |
| 引脚 8 | NC — Not connected (per datasheet) |
| 引脚 9 | VIN2 — Input supply for channel 2 |
| 引脚 10 | SW2 — Switch node for channel 2 |
| 引脚 11 | SW2 — Switch node for channel 2 |
| 引脚 12 | GND — Ground |
| 引脚 13 | PWM2 — PWM dimming input for channel 2 |
| 引脚 14 | CTRL2 — Analog dimming / current set for channel 2 |
| 引脚 15 | GATE2 — PMOS gate driver output for channel 2 |
| 引脚 16 | NC — Not connected (per datasheet) |
| 引脚 17 | VIN3 — Input supply for channel 3 |
| 引脚 18 | SW3 — Switch node for channel 3 |
| 引脚 19 | SW3 — Switch node for channel 3 |
| 引脚 20 | GND — Ground |
| 引脚 21 | PWM3 — PWM dimming input for channel 3 |
| 引脚 22 | CTRL3 — Analog dimming / current set for channel 3 |
| 引脚 23 | GATE3 — PMOS gate driver output for channel 3 |
| 引脚 24 | RT — Timing resistor for switching frequency |
| 引脚 25 | VREF — Internal reference voltage |
| 引脚 26 | SHDN — Shutdown control (active low) |
| 引脚 27 | VC — Internal bypass capacitor |
| 引脚 28 | GND — Ground (exposed pad) |
典型应用
LT3496EUFD 适用于 6 应用s: RGB LED Backlight Driver, Automotive Interior Lighting, Architectural & Stage Lighting, LED Signage & Decorative Strips, Portable LED Projectors, Industrial 24V LED Fixtures.
RGB LED Backlight Driver
The LT3496EUFD is well-suited for RGB LED backlights in LCD monitors and TVs, where each of its three channels independently drives a red, green, and blue LED string. The 750mA per-channel capacity covers high-brightness LED arrays used in edge-lit and direct-lit displays, while the 3000:1 PWM dimming ratio enables smooth brightness adjustment without visible flicker. The PMOS LED-disconnect driver prevents ghosting and color shift during PWM-off cycles, critical for accurate color reproduction across the full dimming range.
推荐
Automotive Interior Lighting
The LT3496EUFD fits automotive interior lighting designs where compact PCB area, high efficiency, and PWM dimmability are essential. Its wide input voltage range handles 12V automotive bus transients, and the buck-boost topology tolerates LED forward voltages above or below the supply rail. The E-grade -40C to +125C temperature rating meets automotive cabin environmental requirements, while the True Color PWM dimming delivers smooth ambient lighting transitions without audible noise or flicker.
推荐
Architectural & Stage Lighting
Architectural and stage lighting fixtures benefit from the LT3496EUFD's triple-channel flexibility and high PWM dimming ratio, which are required for accurate color mixing and silent dimming transitions. Each channel can be configured as buck, boost, or buck-boost, allowing a single PCB design to drive LED strings with different forward voltages. The integrated PMOS disconnect driver prevents color shift during deep dimming, which is critical for theatrical and accent lighting applications.
推荐
LED Signage & Decorative Strips
The LT3496EUFD drives multi-channel LED signage and decorative strips where space is constrained and high channel density is required. The 28-QFN (4x5 mm) UFD package integrates three drivers into a footprint smaller than three discrete solutions, while the adjustable switching frequency allows designers to avoid interference with other onboard noise-sensitive circuits. Per-channel analog and PWM dimming enable individual segment brightness control for animated effects.
推荐
Portable LED Projectors
Portable LED projectors rely on the LT3496EUFD's buck-boost topology to maintain constant LED brightness across battery discharge from full charge down to cut-off. The triple channels can independently drive red, green, and blue high-current LEDs, and the PMOS disconnect driver eliminates leakage that would otherwise waste battery during standby. The wide input range accepts single-cell Li-ion (3V-4.2V) as well as multi-cell battery packs.
推荐
Industrial 24V LED Fixtures
Industrial 24V LED fixtures benefit from the LT3496EUFD's wide VIN tolerance and high PWM dimming ratio. Each channel's buck-boost capability handles LED strings of varying forward voltage while accepting factory 24V bus power directly. The E-grade temperature range supports factory floor and outdoor enclosure environments, and the integrated PMOS disconnect driver simplifies safety isolation requirements for hot-swappable fixtures.
推荐
推荐产品汇总
工程参考数据： LT3496EUFD ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 | LT3496IUFD | LT3496EUFD#PBF | LT3496EUFD#TRPBF | LT3495EUFD | LT3494EUFD |
|---|---|---|---|---|---|---|
| Package | 28-QFN (4x5 mm) UFD | 28-QFN (4x5 mm) UFD - same | 28-QFN (4x5 mm) UFD - same | 28-QFN (4x5 mm) UFD - same | 28-QFN (4x5 mm) UFD - same | 28-QFN (4x5 mm) UFD - same |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Number of Channels | 3 | 3 | 3 | 3 | 2 | 1 |
| Operating Temperature Range | -40C to +125C (E grade) | -40C to +85C (I grade) | -40C to +125C (E grade) | -40C to +125C (E grade) | -40C to +125C (E grade) | -40C to +125C (E grade) |
| Topologies Supported | Buck, Boost, Buck-Boost | Buck, Boost, Buck-Boost | Buck, Boost, Buck-Boost | Buck, Boost, Buck-Boost | Buck, Boost, Buck-Boost | Boost only |
关键差异点
- Triple-channel LED driver with built-in PMOS gate driver （对比 LT3495EUFD)
- Buck-Boost topology flexibility per channel （对比 LT3494EUFD)
- Extended temperature grade (E) available （对比 LT3496IUFD)
- 3000:1 True Color PWM dimming ratio （对比 Discrete LED driver solutions)
设计说明
The 28-QFN UFD package relies on the exposed pad for primary heat dissipation. Estimated: at 750mA per channel across all three channels in buck mode at VIN=12V, VOUT=9V, total power dissipation reaches approximately 6.75W. Solder the exposed pad to a copper pour area of at least 1 square inch with multiple thermal vias to a bottom-side plane. Without adequate copper, junction temperature may exceed 125C under full-load conditions.
Place the input bypass capacitor, the boost diodes, and the output capacitors as close to the IC pins as physically possible to minimize switching-node ringing and EMI. Keep the SW traces short and use a ground plane directly beneath the IC. The PMOS gate driver traces should be kept narrow and short, and routed away from sensitive analog signal paths.
Do not exceed the 45V internal switch rating; calculate the worst-case voltage stress including inductor flyback transients and leave at least 10% margin. The PWM input is logic-level but the PMOS gate driver output swings to the channel input voltage, so ensure the external P-MOSFET VGS rating exceeds the maximum input supply. The CTRL pin sets LED current via external resistor - using 1% or better tolerance resistors maintains channel-to-channel current matching within datasheet limits.
Keep analog dimming (CTRL) traces short and isolated from switching nodes. Place the RT resistor close to the RT pin and avoid running it near noisy traces. The exposed pad must be electrically connected to GND for both thermal performance and electrical reference. For multi-channel designs, route each channel's high-current loop (VIN -> SW -> inductor -> LED string -> GND) within a small, tight loop area to minimize EMI.
合规信息
RoHS and REACH compliant per PBF suffix designation. Not AEC-Q100 qualified - automotive applications should validate thermal and reliability margins per system requirements.
