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| HV82FI资料 | |
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HV82FI PDF Download |
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File Size : 116 KB
Manufacturer:ST Description:The MAX1578/MAX1579 provide four regulated outputs to meet all the voltage requirements for small active- matrix TFT-LCD displays in handheld devices where minimum external components and high efficiency are required. Each device consists of three advanced charge pumps for LCD bias power and a step-up con- verter for driving up to 8 series white LEDs for back- lighting. The input voltage range is from 2.7V to 5.5V. The charge pumps provide fixed +5V, +15V, and -10V for the LCD bias circuits. No external diodes are need- ed. A high-efficiency, fractional (1.5x/2x) charge pump followed by a low-dropout linear regulator provides +5V to power the source driver. Automatic mode changing achieves the highest conversion efficiency. Two multi- stage, high-voltage charge pumps generate +15V and -10V to provide VON and VOFF, respectively. Utilizing a unique clocking scheme and internal drivers, these charge pumps eliminate parasitic charge-current glitch- es and reduce maximum input current, resulting in low electromagnetic emissions. The outputs are sequenced during startup and shutdown. In shutdown, the outputs are discharged to zero. The high-efficiency inductor step-up converter drives up to 8 white LEDs in series with a constant current to provide backlighting. The series connection allows the LED currents to be identical for uniform brightness and minimizes the number of traces to the LEDs. The MAX1578 regulates constant LED current over the entire temperature range. The MAX1579 features a tem- perature derating function to avoid overdriving the white LEDs during high ambient temperatures, enabling higher drive current below +42C. The MAX1578/MAX1579 are available in space-saving 24-lead 4mm x 4mm thin QFN packages. |
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| 1PCS | 100PCS | 1K | 10K | ||
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型 号：HV82FI 厂 家：ST 封 装： 批 号： 数 量：51 说 明：Bid Price |
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运 费： 所在地： 新旧程度： |
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| 联系人：刘先生，罗小姐，刘小姐，刘先生，王先生 |
| 电 话：0086-755-83576094,83576097,83576087,83576084,83979425 |
| 手 机：0086-(0)13728684091 |
| QQ：2355773149,2355773142,61991728 |
| MSN：franlmk168@live.cn |
| 传 真：86-755-83576061 |
| EMail：sales@xgf-ic.com, kupan_ic@126.com |
| 公司地址： 深圳市龙岗区龙岗街道龙岗大道远洋新干线晶钻广场2栋B座2915房 |
