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PT6937 参数 Datasheet PDF下载

PT6937图片预览
型号: PT6937
PDF下载: 下载PDF文件 查看货源
内容描述: 白光LED升压转换器 [White LED Step-Up Converter]
分类和应用: 转换器升压转换器
文件页数/大小: 15 页 / 227 K
品牌: PTC [ PRINCETON TECHNOLOGY CORP ]
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Tel: 886-2-66296288
Fax: 886-2-29174598
URL: http://www.princeton.com.tw
White LED Step-Up Converter
PT6937
DESCRIPTION
The PT6937 is a step-up DC/DC converter specifically designed to drive white LEDs with a constant
current. The device can drive two, three or four LEDs in series from a Li-Ion cell. Series connection of
the LEDs provides identical LED currents resulting in uniform brightness and eliminating the need for
ballast resistors. The PT6937 switches at 1.2MHz, allowing the use of tiny external components. The
output capacitor can be as small as 0.22µF, saving space and cost versus alternative solutions. A low
95mV feedback voltage minimizes power loss in the current setting resistor for better efficiency.
The PT6937 is available in a low profile SOT package.
FEATURES
High efficiency: 85% Typical
Drives up to four LEDs from a 3.3V supply
Drives up to ten LEDs from a 5V supply
Fast 1.2MHz switching frequency
Uses tiny 22µH inductors
Requires only 0.22µF output capacitor
Low profile SOT package
APPLICATIONS
Cellular phones
PDAs, Handheld computers
Digital cameras
MP3 players
GPS receivers
PT6937 V1.1
-1-
March, 2006