Document
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
PGND GND TEST FSET ABC ISET
CH1 CH2 CH3 CH4 CH5 CH6 CH7 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. TSZ22111・14・001
○This product is not designed protection against radioactive rays
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TSZ02201-0G3G0C400340-1-2 07.Nov.2016 Rev.002
BD6142AMUV
Datasheet
●Absolute Maximum Ratings (Ta=25℃)
Parameter
Symbol
Ratings
Unit
Condition
Terminal voltage 1 Terminal voltage 2
VMAX1 VMAX2
7 45
V
VDC, ISET, ABC, COMP, FSET, TEST, FAULT
V CH1 to CH8, LX, OVP
Terminal voltage 3
VMAX3
30.5
V VIN, ENABLE
Terminal voltage 4 Power dissipation 1 Power dissipation 2 Power dissipation 3
VMAX4 Pd1 Pd2 Pd3
15 500 *1 780 *2 1510 *3
V PWM mW mW mW
Operating temperature range
Topr
-40 to +85
℃
Storage temperature range Tstg -55 to+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 to 4layers 5655.04mm2,
When it’s used by more than Ta=25 ℃, it’s reduced by 12.1mW/℃.
●Recommended Operating Rating (Ta=-40℃ to +85℃)
Parameter Power supply voltage
Symbol VIN
Min. 4.2
Limits Typ. 12.0
Max. 27.0
Unit V
Conditions
●Electrical Characteristics (Unless otherwise specified, VIN=12V, Ta = +25℃)
Parameter
Limits Symbol
Min. Typ. Max.
Unit
[General]
Quiescent Current
Iq - 1.6 4.4 µA
Current Consumption
Idd - 3.6 5.4 mA
Max. Output Voltage
MOV
-
- 41 V
Under Voltage Lock Out [ENABLE Terminal] Low Input Voltage range
UVLO 3.1 3.7 4.1 EnL 0.0 - 0.8
V V
High Input Voltage range1
EnH 2.0 - VIN V
Pull down resistor
EnR 100 300 500 kΩ
Output Current [PWM Terminal] Low Input Voltage range
ENIout
-
0
2 µA
PWML 0.0 - 0.8 V
High Input Voltage range2
PWMH 1.3
-
12.0
V
Pull down resistor
PWMR 100 300 500
kΩ
Output Current
PWMIout - 0 2 µA
[FAULT] Nch RON [Regulator] VDC Voltage
FFCR
-
-
3 kΩ
VREG 4.2 5.0 6.0
V
Conditions ENABLE=0V OVP=0V,ISET=36kΩ VIN falling edge
ENABLE=3V ENABLE=0V
PWM=3V PWM=0V ENABLE =PWM=3V, OVP=2V No load, VIN > 6V
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© 2011 ROHM Co., Ltd. All rights reserved. TSZ22111・15・001
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TSZ02201-0G3G0C400340-1-2 07.Nov.2016 Rev.002
BD6142AMUV
Datasheet
●Electrical Characteristics – continued (Unless otherwise specified, VIN=12V, Ta = +25℃)
Parameter
Limits Symbol
Min. Typ. Max.
Unit
[Switching Regulator]
Conditions
LED Control voltage
VLED 0.64 0.80 0.96
V
Switching frequency accuracy
Fsw 1.00 1.25 1.50 MHz FSET=56kΩ
Duty cycle limit
Duty
91.0 95.0 99.0
% CH1-8=0.3V, FSET=56kΩ
LX Nch FET RON [Protection]
RON
-
0.48 0.58
Ω ILX=80mA
Over Current Limit
Ocp 1.5 2.5
-
A *1
Over voltage limit Input
OVP 1.16 1.20 1.24
V Detect voltage of OVP
Output Short Protect
OVPfault 0.02 0.05 0.08
V Detect voltage of OVP
OVP leak current
CH Terminal Over Voltage Protect accuracy [Current driver]
OVIL - 0.1 1.0 µA
VSC
-15
0
+15 % VSC=5V
LED maximum curre.