AL3158設(shè)計的三路1x(2x)電荷泵白光LED驅(qū)動

本文介紹了AL3158主要特性,功能方框圖以及典型應(yīng)用電路.AL3158 是Diodes 公司的高效1x/2x電荷泵白光LED驅(qū)動器,DC/DC轉(zhuǎn)換器采用雙模式負載開關(guān)1x 或2x,VIN電壓范圍從2.7V到5.5V,最大電源效率高達93%,每路LED電流20mA,路間電流匹配1%,內(nèi)置了VOUT短路和LED短路保護功能,主要用在手機白光LED背光和指示器,PDA以及以電池為能源的電話主從屏幕白光LED背光.

AL3158主要特性:

• VIN Range: 2.7V to 5.5V

• Up to 93% Max Power Efficiency

• 1% Current Matching Accuracy Between Channels

• Three simple PWM dimming for RGB or WLED

• Low transition threshold voltage typical 150 mV

• Dual-Mode 1x and 2x Charge Pump

• Drives up to 3 + 3 + 3 Channels of LEDs

• 1.2 MHz Constant Switching Frequency

• VOUT short circuit and Thermal Protections

• Soft Start for reducing inrush current

• Under Voltage Lockout Protection

• IQ <1μA in Shutdown

• Thermally-Enhanced QFN3030-20 Package: Available in “Green” Molding Compound (No Br, Sb)

• Lead Free Finish/ RoHS Compliant

AL3158應(yīng)用:

• Mobile Phone White LED Backlighting and Indicators

• PDA White LED Backlighting

• Battery-operated Phone Main and Sub Screen White LED Backlighting