BD6142AMUV_12 Datasheet, PDF (1/34 Pages) Rohm – 8-Channel White LED Driver

Datasheet
8-Channel White LED Driver
with Integrated FET for up to 80 LEDs
BD6142AMUV
●General Description
This IC is white LED driver IC with PWM step-up
DC/DC converter that can boost max 41V and current
driver that can drive max 30mA. The wide and
precision brightness can be controlled by external
PWM pulse. This IC 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
panel. Small package is suited for saving space.
●Features
 High accuracy & good matching current drivers 8ch
(MAX30mA/ch)
 Integrated 50V power Nch MOSFET
 Soft Start function
 Drive up to 11 LEDs in series, 8 strings in parallel
 Rich safety functions
・Over-voltage protection
・External SBD open detect / Output Short
protection
・Over current limit
・CH Terminal open / GND short protect
・CH over voltage protect / LED short protect
・Thermal shutdown
・UVLO
 Analog Brightness Control
●Key Specifications
 Operating power supply voltage range: 4.2V to 27.0V
 LED maximum current:
30mA (Max.)
 Quiescent Current:
1.6μA (Typ.)
 Switching frequency:
1.25MHz(Typ.)
 Operating temperature range:
-40℃ to +85℃
●Package W(Typ.) x D (Typ.) x H(Max.)
VQFN024V4040
4.00mm x 4.00mm x 1.00mm
VQFN024V4040
Figure 1. Package
●Applications
All medium sized LCD equipments, Backlight of
Notebook PC, net book, monitor, light, Portable DVD
player, light source etc.
●Typical Application Circuit (8 Parallel)
10µF
7V to27V
10µH
2. 2µ F/50V
2.2µF
VOUT
10 serial x 8 parallel (80pcs)
2.1V to VIN
RESET
LX LX
ENAB LE
FAULT
VIN
VDC
OV P
PWM
PWM
fPW M=100Hz~25kHz
1kΩ
22nF
GND
PG ND
CO MP
PGND
B D 61 42 AM U V
CH1
CH2
CH3
CH4
CH5
CH6
CH7
PGND ^{GND TEST FSET} ABC ISET ^CH8
56kΩ 1nF
36kΩ
Figure 2. Typical Application Circuit
2.2MΩ
68kΩ
20mA
○Product structure：Silicon monolithic integrated circuit
www.rohm.com
© 2011 ROHM Co., Ltd. All rights reserved.
TSZ22111ï½¥14ï½¥001
○This product is not designed protection against radioactive rays
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TSZ02201-0G3G0C400340-1-2
03.Dec.2012 Rev.001