BD6590MUV_11 Datasheet, PDF (1/27 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)
BD6590MUV
No.11040EBT14
●Description
BD6590MUV is white LED driver IC with PWM step-up DC/DC converter that can boost max 40V and current driver that can
drive max 30mA. The wide and precision brightness can be controlled by external PWM pulse.
BD6590MUV has very accurate current drivers, and it has few current errors between each strings.
So, it will be helpful to reduce brightness spots on the LCD.
Small package type is suited for saving space.
●Features
1) High efficiency PWM step-up DC/DC converter (fsw=1.25MHz)
2) High accuracy & good matching current drivers (MAX30mA/ch)
3) Integrated 50V power Nch MOSFET
4) Soft start
5) Drive up to 10 in series 6strings in parallel
6) Input voltage range (4.5V ~ 5.5V)
7) Rich safety functions
・Over-voltage protection
・Over current limit
・LED terminal open/short protect
・External SBD open detect / Output short protection
・UVLO
・Thermal shutdown
8) Small & thin package (VQFN024V4040) 4.0 × 4.0 × 1.0mm
●Applications
All middle size LCD equipments backlight of Notebook PC, NetPC,portable DVD player, DPF, etc.
●Absolute Maximum Ratings (Ta=25℃)
Parameter
Symbol
Ratings
Unit
Condition
Maximum applied voltage 1 VMAX1
7
V
VBAT, ISET, TEST, RSTB, PWMDRV
PWMPOW, VDET, FAILFLAG, OCPSET
Maximum applied voltage 2 VMAX2
25
V LED1, LED2, LED3, LED4, LED5, LED6
Maximum applied voltage 3
Power dissipation 1
Power dissipation 2
Power dissipation 3
VMAX3
Pd1
Pd2
Pd3
41
500
780
1510
V SW
mW ^*1
mW ^*2
mW ^*3
Operating temperature range Topr
-40 ~ +85
℃
-
Storage temperature range
Tstg
-55 ~ +150
℃
-
*1 Reduced 4.0mW/℃ With Ta>25℃ when not mounted on a heat radiation Board.
*2 1 layer (ROHM Standard board) has been mounted. Copper foil area 0mm², When it’s used by more than Ta=25℃, it’s reduced by 6.2mW/℃.
*3 4 layer (JEDEC Compliant board) has been mounted. Copper foil area 1layer 6.28mm², Copper foil area 2~4layers 5655.04mm²,
When it’s used by more than Ta=25℃, it’s reduced by 12.1mW/℃.
●Recommended Operating Range (Ta=-40℃ ~ +85℃)
Parameter
Symbol
Limits
Min. Typ. Max.
Unit
Power supply voltage
VBAT
4.5
5.0
5.5
V
Condition
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2011.07 - Rev.B