驱动IC
LN
LN9300/N3228
11
白光LED驱动IC
6
仪器
SOT23-6
2013
类型：经销商
电话：
手机：15817468549
联系人：何丽贤
地址：广东深圳中国 广东 深圳市福田区 TEL:158 1746 8549 Q Q :1160453817(海纳百川） 华强北中航路新亚洲2期N2B071
LN9300是一款用于白光LED驱动的*的低压差电流源，可以作为传统白光LED驱动设计中镇流电阻的替代产品使用。LN9300比镇流电阻更具有优势，体现于：*压差、恒定电流，受电压变化影响小，更小的体积，更高的效率。适合应用于由电池供电直接驱动白光LED的场合。它通过内置电阻来设置四个LED的输出电流，能在2.5v～6v的电压范围内提供稳定的四路20mA电流，相互之间的匹配度*3%，而*需要60mv的跌落电压。
白光LED驱动IC--SN3228
Applications
l White LED backlighting
l Mp3, Mp4, PMP
l Cell phone, *art phone, PDA
Features
l UTQFN-12 (2mm × 2mm ) package
l Low shutdown current: ISHDN <3μA
l Automatic soft start
l Built-in thermal protection
l No inductors, low noise operation
l Drives up to four (SN3228A)/six (SN3228B) channels of LEDs -14 current levels
l Fully programmable current with single wire
l VCC range: 2.8V to 5.5V
Description
The SN3228A (SN3228B) is a low noise, constant frequency charge pump DC/DC converter for white LED applications. The SN3228A (SN3228B) is capable of driving up to four (six) channels of LEDs at preset 20mA per channel from a 2.8V to 5.5V input. The current sinks may be operated individually or in parallel for driving higher current LEDs. Only one 1μF *all capacitor (at C thru C-) and two *all 2.2μF capacitors (at VCC and VOUT) are needed, it makes this part ideally suited for *all, battery-powered applications.
The serial di*al input is used to enable, disable, and set current for each LED with 14 settings down to 1.8mA. Each output of the SN3228A/SN3228B is equipped with built-in soft-start circuitry prevents excessive inrush current during start-up. A low-current shutdown feature disconnects the load from the input and reduces quiescent current to less than 3μA.The SN3228A and SN3228B are available in a Pb-free, space-saving 2mm × 2mm UTQFN-12 package.
