BD8119FM-M_11 Datasheet, PDF (1/21 Pages) Rohm – White Backlight LED Driver for Medium to Large LCD Panels (Switching Regulator Type)

LED Drivers for LCD Backlights
White Backlight LED Driver
for Medium to Large LCD Panels
(Switching Regulator Type)
BD8119FM-M
No.11040EBT17
●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
V_CC
36
V
BOOT ,OUTH Voltage
V_BOOT, V_OUTH
41
V
SW,CS Voltage
V_SW, V_CS, V_OUTH
36
V
BOOT-SW Voltage
V_BOOT-SW
7
V
LED output voltage
VREG, OVP, OUTL, FAIL1, FAIL2,
LEDEN1, LEDEN2, ISET, VDAC,
PWM, SS, COMP, RT, SYNC, EN Voltage
Power Consumption
V_LED1～4
36
V
V_VREG, V_OVP, V_OUTL, V_FAIL1, V_FAIL2,
V_LEDEN1, V_LEDEN2, V_ISET, V_VDAC,
-0.3～7 < V_CC
V
V_PWM, V_SS, V_COMP, V_RT, V_SYNC, V_EN
Pd
2.20 ^※1
W
Operating temperature range
Topr
-40～+95
℃
Storage temperature range
Tstg
-55～+150
℃
LED maximum output current
I_LED
150 ^{※2 ※3}
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 Dispersion figures for LED maximum output current and V_F are correlated. Please refer to data on separate sheet.
※3 Amount of current per channel.
●Operating conditions (Ta=25℃)
Parameter
Symbol
Ratings
Power supply voltage
Oscillating frequency range
External synchronization frequency range ^{※4 ※5}
V_CC
F_OSC
F_SYNC
5.0～30
250～550
fosc～550
External synchronization pulse duty range
F_SDUTY
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.
Unit
V
kHz
kHz
%
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2011.08 - Rev.B