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2011.08 - Rev.B

© 2011 ROHM Co., Ltd. All rights reserved.

LED Drivers for LCD Backlights

White Backlight LED Driver

for Medium to Large LCD Panels

(Switching Regulator Type)

BD8119FM-M

●

Description

BD8119FM-M is a white LED driver with the capability of withstanding high input voltage (36V MAX).

This driver has 4ch constant-current drivers integrated in 1-chip, which each channel can draw up to 150mA max, so that

high brightness LED driving can be realized.

Furthermore, a current-mode buck-boost DC/DC controller is also integrated to achieve stable operation against unstable

car-battery voltage input and also to remove the constraint of the number of LEDs in series connection.

The brightness can be controlled by either PWM or VDAC techniques.

●

Features

1) Input voltage range is 5.0 to 30 V

2) Integrated buck-boost current-mode DC/DC controller

3) Four integrated LED current driver channels (150mA max. each channel)

4) PWM Light Modulation (Minimum Pulse Width 25µs)

5) Built-in protection functions (UVLO, OVP, TSD, OCP, SCP)

6) Abnormal status detection function (OPEN/ SHORT)

7) HSOP-M28 package

●

Applications

Backlight for car navigation, dashboard panels, etc.

(※ Recommended Component of Toshiba Matsushita Display Technology Co.,Ltd. )

●

Absolute maximum ratings (Ta=25℃)

Parameter

Symbol

Ratings

Unit

Power supply voltage

36

V

BOOT ,OUTH Voltage

41

V

SW,CS Voltage

36

V

BOOT-SW Voltage

7

V

LED output voltage

36

V

VREG, OVP, OUTL, FAIL1, FAIL2,

LEDEN1, LEDEN2, ISET, VDAC,

PWM, SS, COMP, RT, SYNC, EN Voltage

V

Power Consumption

Pd

1

W

Operating temperature range

Topr

-40～+95

℃

Storage temperature range

Tstg

-55～+150

℃

LED maximum output current

mA

※

1

IC mounted on glass epoxy board measuring 70mm×70mm×1.6mm, power dissipated at a rate of 17.6mw/℃ at temperatures above 25℃.

※

2

※

3 Amount of current per channel.

●

Operating conditions (Ta=25℃)

Parameter

Symbol

Ratings

Unit

Power supply voltage

5.0～30

V

Oscillating frequency range

250～550

kHz

fosc～550

kHz

External synchronization pulse duty range

40～60

%

※

4 Connect SYNC to GND or OPEN when not using external frequency synchronization.

※

5 Do not switch between internal and external synchronization when an external synchronization signal is input to the device.

No.11040EBT17