BL8549 datasheet(1/6 Pages) BELLING

Part #	BL8549

Description	40V Backlight LED Driver with PWM Direct Dimming

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Manufacturer	BELLING [SHANGHAI BELLING CO., LTD.]

Direct Link	http://www.belling.com.cn

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40V Backlight LED Driver with PWM Direct Dimming

BL8549

DESCRIPTION

The BL8549 is a high efficiency current-mode

asynchronous, 40V boost converter for LED

backlight driving. Its input voltage ranges from

2.5V to 4.5V and it provides an adjustable

constant current output decided by the Rset

connected to BL8549’s FB pin. The LED brightness

can also be controlled by a PWM signal directly

set to CE pin, making dimming control very

simple.

The BL8549’s switching frequency is set to

600KHz, and it will automatically switch between

PFM and PWM mode based on the load current,

thus to enhance the converter efficiency at light

load as well as heavy load.

BL8549 consists of many protection blocks such

as UVLO, output voltage over voltage protection,

and thermal protection to keep the chip and load

safe under unexpected environment.

The BL8549 is available in the tiny DFN2x2-6 and

SOT23-6 package.

FEATURES

 Adjustable Output Voltage, Vfb=0.2V

 Output voltage 40V, driving up to 12 LED string

 Range of operation input voltage: 2.5 – 4.5V

 Output Overvoltage Protection @40V

 CE pin PWM direct dimming function

 Line regulation: 0.1%/V (typ.)

 Load regulation: 10mV (typ.)

 High efficiency, up to 90% in driving 10 LEDs

 Environment Temperature: -20C~85C

APPLICATIONS

 Smartphone

 7” MID

 Portable DVD

 TFT LCD bias

 Portable LED lighting or torch

 Other application need high voltage

TYPICAL APPLICATION and PIN OUT

Efficiency for Driving 10 LEDs

40

45

50

55

60

65

70

75

80

85

90

95

100

0

10

20

30

40

50

Output Current (mA)

Efficiency VS Iout for 10 LEDs

Vin=3.6V

Vin=3.8V

Vin=4.2V

BL8549

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BL8549 Datasheet(PDF) 1 Page - SHANGHAI BELLING CO., LTD.

BL8549 Datasheet(HTML) 1 Page - SHANGHAI BELLING CO., LTD.

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