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SM8136A Datasheet (PDF) - Nippon Precision Circuits Inc

SM8136A Datasheet PDF - Nippon Precision Circuits Inc
Part # SM8136A
Download  SM8136A Download

File Size   126.34 Kbytes
Page   15 Pages
Manufacturer  NPC [Nippon Precision Circuits Inc]
Direct Link  http://www.npc.co.jp/en
Logo NPC - Nippon Precision Circuits Inc
Description White LED Driver IC

SM8136A Datasheet (PDF)

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SM8136A Datasheet PDF - Nippon Precision Circuits Inc

Part # SM8136A
Download  SM8136A Click to download

File Size   126.34 Kbytes
Page   15 Pages
Manufacturer  NPC [Nippon Precision Circuits Inc]
Direct Link  http://www.npc.co.jp/en
Logo NPC - Nippon Precision Circuits Inc
Description White LED Driver IC

SM8136A Datasheet (HTML) - Nippon Precision Circuits Inc

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SM8136A Product details

OVERVIEW

The SM8136A is a charge pump type white LED driver. It can drive 1 to 3 backlight white LED connected in parallel, making it ideal for portable devices with small LCD. The charge pump switches between ×1 bypass mode to ×1.5 boost mode in response to LED drive current requirements. 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). Besides, the detection of switching is repeated in approx. 1sec-cycle by mode reset action, the SM8136A can respond to temporary variation of supply voltage. These ingenuities on switching detection can prolong the battery life to the fullest extent. Each LED drive current is controlled by a 3-channel LED drive

current control circuit.



FEATURES

■ Battery life extension by automatic charge pump switch between ×1 to ×1.5 according to the detection of the LED drive current

■ Controlling 1 to 3 lights of white LED connected in parallel

■ 1-wire input controlling

■ ON/OFF and brightness control by signal control ling of EN pin

■ Soft start circuit built-in

■ Input voltage range

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

   Load current (IOUT= 60mA): 3.0 to 4.6V

■ Maximum output voltage: 5.0V (typ)

■ Maximum output current: 60mA (typ)

■ Quiescent current

    Not-switching (×1 mode): 0.3mA (typ)

    Switching (×1.5 mode): 1.0mA (typ)

■ Standby current: 0.01µA (typ)

■ Operating frequency (boost mode): 1.0MHz (typ)

■ LED drive current accuracy between channel: ± 5.0%

■ Package: 12-pin QFN



APPLICATIONS

■ Cellular phone

■ PDA

■ Portable games

■ Portable audio equipment

■ Handy terminal

■ Digital still camera

■ Digital video camera

■ LCD panel back light

■ White LED driving




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