LM3502ITL-44 750mA Step-Up LED Driver | Texas Instruments
料号： LM3502ITL-44 ✓ 量产中LM3502ITL-44 概述
A white-LED driver is a power-management IC that uses a step-up converter to raise a supply voltage above the forward voltage of an LED string. Within the hierarchy of LED drivers, boost converters, DC-DC converters, and power-management ICs, the LM3502 provides the high current and compact packaging required by modern display backlighting while adding controlled dimming through PWM.
The verified distributor listing identifies the device as a 2-output, step-up DC-DC regulator with PWM dimming and a 750 mA switch rating. The -44 suffix identifies the manufacturer ordering variant shown in the supplied records. The 10-ball VFBGA package places the switching and control connections in a compact surface-mount footprint suitable for space-constrained display and lighting equipment.
The LM3502 uses an inductive boost topology to supply LED strings whose combined forward voltage can exceed the available input rail. Its switching architecture permits high conversion ratios, while PWM dimming allows brightness to be controlled without operating the LED drive path continuously at full command level. The dual-output arrangement supports applications involving two separately driven display or lighting channels, subject to the configuration and current limits defined in the manufacturer datasheet.
Typical uses include LCD backlighting, dual-display white-LED illumination, keypad and status lighting, and compact backlit instruments. In these systems, the IC regulates LED current while the external inductor, switching components, and feedback network complete the power-conversion loop. Appropriate PCB layout and current-limit selection are essential because boost converters combine high di/dt current pulses with sensitive feedback and dimming signals.
For an LM3502ITL-44 design, verify the exact LED-string voltage, total current, switching-current margin, inductor saturation current, and PWM polarity against the manufacturer datasheet. Keep the switching loop compact and provide a low-impedance ground return so the small 10-ball package can deliver repeatable current regulation without excessive EMI or unstable dimming behavior.
直接替换替代料： LM3502ITL-44 ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
该产品暂无直接替换替代料。
请求替代料LM3502ITL-44 最大额定值与电气特性
| Product Type | 2-output step-up DC-DC regulator and white-LED driver |
| Switch Current | 750 mA |
| 开关频率 | 2 MHz |
| Dimming Method | PWM dimming |
| 输出数量 | 2 outputs |
| Converter Topology | Step-up (boost) |
| Package Type | 10-ball VFBGA |
| Package Dimensions | 1.9 mm x 2.07 mm |
| Terminal Count | 10 terminals |
| Terminal Form | Ball |
| Package Shape | Rectangular |
| Temperature Grade | Industrial |
| 安装类型 | Surface mount |
LM3502ITL-44 rectangular 引脚配置指南
LM3502ITL-44（rectangular 封装）的引脚配置。 该功率器件具有栅极、漏极和源极端子。对于无极性封装，请参阅制造商数据手册以了解确切的引脚 1 方向和封装尺寸细节。常见应用包括电源设计、电机驱动和负载开关。
暂无详细引脚数据： LM3502ITL-44.
请参阅 数据手册 以查看完整引脚配置。
典型应用
LM3502ITL-44 适用于 6 应用s: Dual-Display LCD Backlighting, Large Single White-LED String Backlighting, Keypad and Status Lighting, Industrial Panel Illumination, Portable Display Backlight, Dual-Channel Backlit Instrument.
Dual-Display LCD Backlighting
The LM3502ITL-44 is appropriate for dual-display backlighting because the verified DigiKey listing identifies a 2-output, step-up white-LED driver with PWM dimming and a 750 mA switch rating. Place the device at the convergence point of the two LED channels, with separate output networks sized for their respective string currents. The 2 MHz switching architecture helps keep magnetic and capacitive components compact, while the 10-ball VFBGA occupies only 1.9 mm by 2.07 mm. Confirm each channel's string voltage, current limit, dimming polarity, and startup sequence against the datasheet before layout.
推荐
Large Single White-LED String Backlighting
The LM3502ITL-44 can drive a large white-LED backlight string when the string voltage exceeds the available input rail. Its 750 mA switch rating and 2 MHz step-up operation provide a compact solution for instrument panels, industrial displays, and specialty lighting. The external inductor must sustain the specified peak current with suitable saturation margin, and the output network must be designed for the actual string capacitance and ripple requirement. PWM dimming provides brightness control without changing the external feedback setting.
推荐
Keypad and Status Lighting
The LM3502ITL-44's dual-output architecture can organize independently dimmed white-LED groups in keypad, control-panel, and status-indicator lighting. PWM dimming is useful when brightness must change without altering the LED current set point, and the small 10-ball VFBGA preserves PCB area around dense user interfaces. Use each output for a current-regulated string, route dimming control away from the switching node, and verify whether simultaneous channel operation approaches the device's current or thermal limits.
推荐
Industrial Panel Illumination
The LM3502ITL-44 is a candidate for compact industrial panel illumination where white-LED strings require voltage above the panel's low-voltage supply. The 750 mA switch rating and PWM dimming support efficient, adjustable illumination in equipment with limited board area. Its industrial temperature-grade classification supports non-extreme industrial use, subject to the final operating-temperature limits in the manufacturer datasheet. Pay particular attention to EMI control, enclosure grounding, and the heat generated by the inductor and compact driver package.
推荐
Portable Display Backlight
The LM3502ITL-44 fits portable display systems where board area, adjustable brightness, and boost conversion from a battery-derived rail are important. Its compact 1.9 mm by 2.07 mm VFBGA leaves room for passives and display connectors, while 2 MHz PWM dimming supports responsive brightness control. Because battery systems vary in voltage, verify startup behavior and regulation across the full source range, and account for conversion loss when estimating battery life. The inductor and capacitors should be selected for the worst-case LED current and permitted output ripple.
推荐
Dual-Channel Backlit Instrument
The LM3502ITL-44 can support separate LED backlight channels in test equipment, medical-control panels, and compact instruments where two illuminated areas require coordinated drive. The two outputs provide a structured approach to channel management, while PWM dimming allows the operator to adjust brightness for different ambient conditions. Confirm each output's permitted current and whether the outputs may be independently enabled or dimmed. Because the device is a switching boost regulator, keep feedback routing short and validate conducted and radiated emissions early in the enclosure-level design.
推荐
推荐产品汇总
工程参考数据： LM3502ITL-44 ——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 |
|---|---|
| Package | 10-ball VFBGA, 1.9 mm x 2.07 mm |
| Brand | Texas Instruments |
| Switch Current | 750 mA |
| Switching Frequency | 2 MHz |
| Number of Outputs | 2 outputs |
| Converter Topology | Step-up (boost) |
| Dimming Method | PWM dimming |
| Temperature Grade | Industrial |
| Terminal Count | 10 terminals |
关键差异点
- Compact dual-output LED-driver integration （对比 LM3502ITL-44/NOPB)
- High-frequency boost operation for compact backlighting designs （对比 Generic cross-reference candidates)
- Dedicated white-LED backlighting functionality （对比 General-purpose boost converters)
设计说明
Treat the boost-converter power loop as a compact current loop: connect the input capacitor, LM3502ITL-44 switching node, and inductor with the shortest practical paths. The 2 MHz switching frequency makes trace inductance important because it can increase ringing, EMI, and switching loss. Keep the exposed switching copper away from feedback and dimming traces, and use a continuous ground reference beneath and around the device where the package and layout guidance permit.
Do not size the external inductor from average LED current alone. It must handle the peak boost-switch current associated with the 750 mA switch rating, including margin for layout effects, temperature, and tolerance. Verify the inductor's saturation current and DC resistance against the datasheet's operating conditions. Also confirm the LED-string voltage, current setting, PWM polarity, and startup behavior; those values are not supplied in the verified distributor snippets.
PWM dimming and the 2 MHz boost stage can both create harmonics that interfere with nearby analog or communication circuitry. Route feedback away from the switch node, keep the dimming input quiet, and provide local input and output bypass capacitors using the manufacturer recommendations. In completed equipment, test radiated emissions, conducted emissions, and LED-current ripple because a compact 10-ball package alone does not ensure system-level EMI compliance.
合规信息
The supplied verified results do not extract RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals declarations. The industrial temperature-grade classification is reported by the verified distributor listing but does not establish AEC-Q100 qualification.
