BD6581GU-E2 Datasheet, PDF (1/35 Pages) Rohm – 6-Channel White LED Driver for up to 72 LEDs

Datasheet
6-Channel White LED Driver
for up to 72 LEDs
BD6581GU
˔General Description
BD6581GU is white LED driver IC with PWM step-up
DC/DC converter that can boost max 42.5V and
current driver that can drive max 25mA. The wide and
precision brightness can be controlled by external
PWM pulse.
BD6581GU 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.
˔Key Specification
 Operating power supply voltage range: 2.7V ~ 22.0V
 Quiescent Current 1:
0.6μA (Typ.)
Quiescent Current 2:
4.6μA (Typ.)
 Operating temperature range:
-30ˆ ~+85ˆ
˔Package
VCSP85H2:
W(Typ.) x D(Typ.) x H (Max.)
2.60mm x 2.60mm x 1.00mm
[bottom view]
˔Features
 High efficiency PWM step-up DC/DC converter
(fsw=1MHz), max efficiency 93%
 High accuracy & good matching (ʶ1.5%) current
drivers 6ch
 Drive up to 12^ˎ in series, 6 strings in parallel =72
white LEDs (^ˎwhite LED Vf=3.5Vmax)
 Rich safety functions
ɾOver-voltage protection (OVP)
ɾOver current limit
ɾExternal SBD open detect
ɾThermal shutdown
E LED6
LED5
LED4
LED3
LED2
D RSTB
GND
FAILSEL
GND
LED1
C VBAT PWMPOW VREG
ISETL PWMDRV
B N.C
-
TEST
ISETH
GND
A VDET
N.C
SW
SENSP SENSN
1
2
3
4
5
˔Application
All middle size LCD equipments backlight of Notebook
PC, portable DVD player, car navigation systems, etc.
˔Typical Application Circuit
Battery
10μF
4.7μH
2 .2μF *
RTR020N05
100mΩ
Power
ON/OFF
200Hz
PWM
1μF
SW
SENSP
FAILSEL _VDET
SENSN
RSTB ^BD6581GU
PWMPOW
LED1
PWMDRV
VBAT
LED2
LED3
LED4
VREG
LED5
GN GNDGNDGND^{TESTISETHISETL}_LED6
24kΩ
10LED x 6parallel
Each 20mA
Figure 1. Typical Application Circuit
˓Product structureɿSilicon monolithic integrated circuitç ˓This product is not designed protection against radioactive rays
www.rohm.com
© 2012 ROHM Co., Ltd. All rights reserved.
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TSZ02201-0G3G0C400170-1-2
03.Dec.2012 Rev.001