描述 Description

The SC4541 is a fully integrated, high voltage boost (stepup) and buck (step-down) LED driver. The input voltage range is 2.9V to 22V with output voltage up to 25V. The device is capable of driving up to 7 white LEDs. The high side sense enables a single-wire LED connection by taking advantage of the available system ground. This reduces connector cost and complexity.

特性 Features

■ VIN Range — 2.9V to 22V

■ VOUT Range — Up to 25V

■ IOUT Range:

■ Up to 100mA (Boost)

■ Up to 200mA (Buck)

■ Drives Up to 7 Series WLEDs (Boost)

■ Drives Up to 5 Series WLEDs (Buck)

■ Integrated Schottky Rectifier

■ Single-Wire LED Connect

■ Current Mode Control

■ Frequency — 2.0MHz

■ No External Compensation

■ Direct PWM Dimming

■ 100:1 Range at 500Hz

■ Open-LED Protection — 27V

■ Low Shutdown Current < 1μA

■ Package Options:

■ Low Profile MLPD-UT, 6-pin 2x2 x0.6(mm)

■ SOT23, 6-pin 2.9x2.8 x1.45(mm)

■ Lead-free, Halogen-Free and WeEE/RoHS Compliant

Applications

■ Keypad Illumination

■ DSC and DSLR Display Backlight

■ Cellular Handsets

■ Automotive Lighting