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SM8135B Scheda tecnica (PDF) - Nippon Precision Circuits Inc

SM8135B Datasheet PDF - Nippon Precision Circuits Inc
Il numero della parte SM8135B
Scarica  SM8135B Scarica

Grandezza file   148.82 Kbytes
Page   19 Pages
Produttore elettronici  NPC [Nippon Precision Circuits Inc]
Homepage  http://www.npc.co.jp/en
Logo NPC - Nippon Precision Circuits Inc
Spiegazioni elettronici White LED Driver IC

SM8135B Datasheet (PDF)

Go To PDF Page Scarica Scheda tecnica
SM8135B Datasheet PDF - Nippon Precision Circuits Inc

Il numero della parte SM8135B
Scarica  SM8135B Click to download

Grandezza file   148.82 Kbytes
Page   19 Pages
Produttore elettronici  NPC [Nippon Precision Circuits Inc]
Homepage  http://www.npc.co.jp/en
Logo NPC - Nippon Precision Circuits Inc
Spiegazioni elettronici White LED Driver IC

SM8135B Scheda tecnica (HTML) - Nippon Precision Circuits Inc

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SM8135B Dettagli del prodotto

OVERVIEW

The SM8135B is a charge pump type white LED driver. It can drive 1 to 4 backlight white LED connected in parallel, making it ideal for portable devices with small LCD. The charge pump switches between ×1 bypass mode, ×1.5 and ×2 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 SM8135B 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 4-channel LED drive

current control circuit. The LED drive current per channel is setup by external resistor.



FEATURES

■ Battery life extension by automatic charge pump switch between ×1, ×1.5 and ×2 according to the detection of the LED drive current

■ Controlling 1 to 4 lights of white LED connected in parallel

■ Set up LED drive current value by external resistor (120kΩ: 20mA/ch)

■ 1-wire input controlling

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

■ Soft start circuit built-in

■ Thermal shut down 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

■ Maximum output voltage: 4.9V (typ)

■ Maximum output current: 80mA (typ)

■ Quiescent current

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

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

    Switching (×2 mode): 1.5mA (typ)

■ Standby current: 0.01µA (typ)

■ Operating frequency (boost mode): 1MHz (typ)

■ LED drive current accuracy between channel (REST = 120kΩ): ± 5% (max)

■ Package: 16-pin QFN



APPLICATIONS

■ Cellular phone

■ PDA

■ Portable games

■ Handy terminal

■ Digital still camera

■ Digital video camera

■ LCD panel back light

■ White LED driving




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