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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.
● Key Specification
? Operating power supply voltage range: 2.7V ~ 22.0V
? Quiescent Current 1: 0.6 μ A (Typ.)
Quiescent Current 2: 4.6 μ A (Typ.)
? Operating temperature range: -30 ℃ ~+85 ℃
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.
● 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
E
LED6
LED5
LED4
LED3
LED2
(fsw=1MHz), max efficiency 93%
? High accuracy & good matching ( ± 1.5%) current
D
RSTB
GND
FAILSEL
GND
LED1
drivers 6ch
? Drive up to 12 ＊ in series, 6 strings in parallel =72
C
VBAT
PWMPOW
VREG
ISETL
PWMDRV
white LEDs ( ＊ white LED Vf=3.5Vmax)
? Rich safety functions
? Over-voltage protection (OVP)
B
N.C
-
TEST
ISETH
GND
? Over current limit
? External SBD open detect
A
VDET
N.C
SW
SENSP
SENSN
? Thermal shutdown
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
10 μ F
4.7 μ H
2 .2 μ F *
10LED x 6parallel
RTR020N05
100m ?
SW
SENSP
FAILSEL
VDET
SENSN
Power
ON/OFF
RSTB
BD6581GU
PWMPOW
LED1
200Hz
PWMDRV
LED2
PWM
VBAT
LED3
LED4
LED5
1 μ F
VREG
GN GND GND GND TEST ISETH ISETL LED6
24k ?
Figure 1. Typical Application Circuit
Each 20mA
○ Product structure ： Silicon monolithic integrated circuit
○ This product is not designed protection against radioactive rays
www.rohm.com
? 2012 ROHM Co., Ltd. All rights reserved.
TSZ22111 ? 14 ? 001
1/32
TSZ02201-0G3G0C400170-1-2
03.Dec.2012 Rev.001
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