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SM8122A 数据表 (PDF) - Nippon Precision Circuits Inc

SM8122A Datasheet PDF - Nippon Precision Circuits Inc
部件名 SM8122A
下载  SM8122A 下载

文件大小   162.12 Kbytes
  13 Pages
制造商  NPC [Nippon Precision Circuits Inc]
网页  http://www.npc.co.jp/en
标志 NPC - Nippon Precision Circuits Inc
功能描述 White LED Driver IC

SM8122A Datasheet (PDF)

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SM8122A Datasheet PDF - Nippon Precision Circuits Inc

部件名 SM8122A
下载  SM8122A Click to download

文件大小   162.12 Kbytes
  13 Pages
制造商  NPC [Nippon Precision Circuits Inc]
网页  http://www.npc.co.jp/en
标志 NPC - Nippon Precision Circuits Inc
功能描述 White LED Driver IC

SM8122A 数据表 (HTML) - Nippon Precision Circuits Inc

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SM8122A 产品详情

OVERVIEW
The SM8122A is a high efficiency step-up DC/DC converter. Due to high voltage CMOS process realizing 25V output supply as maximum value, 2 to 6 lights of white LED connected in series can be lighted. By connecting in series, current variation among LED is eliminated. Current value sent to white LED can be set by external resistors. In addition, brightness can also be adjusted by control to FB pin or CE pin. Since the SM8122A has an over voltage protection circuit built-in, it dispenses with the existing external ZD (zener diode). Besides, the switching frequency of the SM8122A is higher (2.0MHz) than the existing product (SM8121A), so that it can respond to lower inductance value.

FEATURES
■ Boost-up control using PWM
■ 2 to 6 lights of white LED (connected in series) lighted
■ Output current value can be set by external resistors (51Ω: 9.8mA, 33Ω: 15.2mA, 24Ω: 20.8mA)
■ Brightness adjustable by control to FB pin or CE pin
■ Current variation among LED decreased by high precision
■ High efficient drive by step-up model
■ Over voltage protection circuit built-in
■ Supply voltage range: 2.3 to 5.5V
■ Maximum output voltage: 25V
■ Quiescent current: 820µA (typ)
■ Standby current: 1.0µA (max)
■ RON (Switching MOS-Tr): 2Ω (typ)
■ Switching frequency: 2.0MHz (typ)
■ Output current detection accuracy: ± 2%
■ Package: SOT23-6W (SM8122AH)
                   MSON-6 (SM8122AD)

APPLICATIONS
■ Cellular phone
■ Pager
■ Digital still camera
■ Handy terminal
■ PDAs
■ Portable games
■ White LED drive
■ LCD bias supply
■ Flash memory supply




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