LM3508 - 同步磁性恒流白光 LED 驱动器

LM3508是TI德州仪器公司的一款背光产品，LM3508是同步磁性恒流白光 LED 驱动器，本站介绍了LM3508的封装应用图解、特点和优点、功能等，并给出了与LM3508相关的TI元器件型号供参考。

LM3508 - 同步磁性恒流白光 LED 驱动器 - 背光 - LED驱动器 - 德州仪器

产品描述

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.

产品特性

Drives 4 Series White LEDs with up to 30mA
>80% Peak Efficiency
Up to 100kHz PWM Brightness Control
Accurate ±5% LED Current Regulation across VIN 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 DSBGA Package (1.514mm x 1.514mm x 0.6mm)

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