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SM8134AB 数据表 (PDF) - Nippon Precision Circuits Inc

SM8134AB Datasheet PDF - Nippon Precision Circuits Inc
部件名 SM8134AB
下载  SM8134AB 下载

文件大小   144.24 Kbytes
  19 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

SM8134AB Datasheet (PDF)

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SM8134AB Datasheet PDF - Nippon Precision Circuits Inc

部件名 SM8134AB
下载  SM8134AB Click to download

文件大小   144.24 Kbytes
  19 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

SM8134AB 数据表 (HTML) - Nippon Precision Circuits Inc

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SM8134AB 产品详情

OVERVIEW

The SM8134A is a charge pump type white LED driver. It can drive 1 to 4 backlight white LED connected in parallel and 1 flash white LED, making the device ideal for camera-equipped cellular phones. The charge pump switches between ×1 to ×1.5 boost mode in response to LED drive current requirements to extend battery life to the maximum. The boost switching occurs in response to the drive current of all the connected LED and thus supports variations in LED forward-bias voltage drop (VF). Each LED drive current is controlled by a 5-channel LED drive current control circuit. The backlight LED drive current and ON/OFF control, and flash

LED drive current and ON/OFF control are all set by 3-wire serial interface data input. Also, an under voltage lockout (UVLO) circuit is built-in to prevent incorrect operation when the battery voltage drops.



FEATURES

■ Noise reduction due to charge pump boost circuit

■ Automatic charge pump switching to conserve power

■ Drives 1 to 4 backlight white LED (30mA/ch at maximum setting)

■ Drives a flash white LED (150mA at maximum setting)

■ Backlight and flash white LED brightness adjustment

■ 3-wire serial input interface for all setting and control

■ Under voltage lockout (UVLO) circuit built-in

■ Soft start circuit built-in

■ Thermal protection circuit built-in

■ Input voltage range

• No-load current (IOUT= 0mA): 2.7 to 4.6V

• Load current (IOUT= 80mA): 3.0 to 4.6V

• Load current (IOUT= 180mA): 3.3 to 4.6V

• Load current (IOUT= 200mA): 3.4 to 4.6V

■ Quiescent current

• Not-switching (×1.0 mode): 0.3mA (typ)

• Switching (×1.5 mode): 1.7mA (typ)

■ Standby current: 0.01µA (typ)

■ Operating frequency: 750kHz (typ)

■ Maximum backlight LED current: 30mA/ch

■ Maximum flash LED current: 150mA

■ All LED total maximum current: 200mA

■ Backlight LED current matching (ILED= 20mA) : ±3%

■ Flash LED current accuracy (ILED= 150mA) : ±6.7%

■ Packages: 16-pin QFN



APPLICATIONS

■ Cellular phone

■ Digital still camera

■ PDA

■ Portable games




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