LM3508中文资料同步磁性恒流白光 LED 驱动器数据手册TI规格书

描述 Description

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 850kHz 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 available in a tiny 9-bump chip-scale DSBGA package.

特性 Features

• Drives 4 Series White LEDs with up to 30mA
• Up to 100kHz PWM Brightness Control
• Internal Synchronous PFET (No Schottky Diode Required)
• Output Short-Circuit Protection
• Internal Soft-Start Eliminates Inrush Current
• 850kHz Fixed Frequency Operation
• Low Profile 9-Bump DSBGA Package (1.514mm x 1.514mm x 0.6mm)