LM3508TL 评估板




The LM3508 is a synchronous boost converter (no external Schottky diode required) that provides a constant current output. It is designed to drive up to 4 series white LEDs at 30mA from a single-cell Li-Ion battery. A single low power external resistor is used to set the maximum LED current. The LED current can be adjusted by applying a PWM signal of up to 100kHz to the DIM pin. Internal soft-start circuitry is designed to eliminate high in-rush current at start-up. For maximum safety, the device features an advanced short-circuit protection when the output is shorted to ground. Additionally, over-voltage protection and an 850 kHz switching frequency allow for the use of small, low-cost output capacitors with lower voltage ratings. During shutdown, the output is disconnected from the input preventing a leakage current path through the LEDs to ground.

The LM3508 is a synchronous step-up Dc/Dc converter deisgned for white LED applications. The evaluation board is set up to drive 4 standard VF white LEDs from a 2.7V to 5.5V input supply. The application note contains information about the evaluation board.

  • Drives 4 Series White LEDs with up to 30mA
  • >80% Peak Efficiency
  • Up to 100kHz PWM Brightness Control
  • Accurate ±5% LED Current Regulation across V IN Range
  • Internal Synchronous PFET (No Schottky Diode Required)
  • True Shutdown Isolation
  • Output Short-Circuit Protection
  • 17.5V Over-Voltage Protection
  • Internal Soft-Start Eliminates Inrush Current
  • Wide Input Voltage Range: 2.7V to 5.5V
  • 850kHz Fixed Frequency Operation
  • Low Profile 9-Bump Micro-SMD Package (1.514mm x 1.514mm x 0.6mm)


  • White LED Backlighting
  • Handheld Devices
  • Digital Cameras
  • Portable Applications
背光 LED 驱动器
LM3508 同步磁性恒流白光 LED 驱动器
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LM3508TLEV — LM3508TL Evaluation Board

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类型 标题 下载最新的英文版本 日期
* EVM 用户指南 AN-1593 LM3508 Evaluation Board 2007年 6月 4日
证书 LM3508TLEV EU Declaration of Conformity (DoC) 2019年 1月 2日


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