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PDF BD6586MUV Data sheet ( Hoja de datos )

Número de pieza BD6586MUV
Descripción 4-Channel White LED Driver
Fabricantes ROHM Semiconductor 
Logotipo ROHM Semiconductor Logotipo



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Datasheet
4-Channel White LED Driver
with Integrated FET for up to 24 LEDs
BD6586MUV
General Description
BD6586MUV is white LED driver IC with PWM step-up
DC/DC converter that can boost max 24V and current
driver that can drive max 25mA. The wide and
precision brightness can be controlled by external
PWM pulse.
BD6586MUV 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 Specifications
Operating power supply voltage range: 2.7V to 5.5V
LED maximum current:
25mA (Max.)
Quiescent Current:
0.1μA (Typ.)
Switching frequency:
1.0MHz(Typ.)
Operating temperature range:
-40 to +85
Package W(Typ.) x D(Typ.) x H(Max.)
Features
High accuracy & good matching (±3.0%) current
drivers 4ch (MAX.25mA/ch)
28V power Nch MOSFET
Soft Start
Drive up to 6 in series, 4 strings in parallel
Rich safety functions
Over-voltage protection
Output Short protection
External SBD open detect
Over current limit
Thermal shutdown
UVLO
VQFN024V4040
4.00mm x 4.00mm x 1.00mm
Figure 1.
Typical Application Circuit
Battery
2.7V to 5.5V
Applications
All middle size LCD equipments backlight of Notebook
PC, portable DVD player, car navigation systems, etc.
4 .7μ F
4. 7μ H
2. 2μF
1 μF
6LED x 4Parallel
1 00H z~1 kHz
PWM
SW SW SW
TRSW
VBAT VDET
EN2
EN1
PWM
TESTO
TEST PGND PGND GND
GND GND
L ED 1
LED2
L ED 3
L ED 4
ISET
2 4k
Each 20mA
Can be set up to each 10~25mA
Figure 2. Typical Application Circuit
(Power control PWM application)
Product structure Silicon monolithic integrated circuit
www.rohm.com
© 2012 ROHM Co., Ltd. All rights reserved.
TSZ22111 14 001
This product is not designed protection against radioactive rays
1/20
TSZ02201-0G3G0C400190-1-2
10.Dec.2012 Rev.001

1 page




BD6586MUV pdf
BD6586MUV
Datasheet
Description of Functions - continued
3) External SBD open detect and over voltage protection
BD6586MUV has over boost protection by external SBD open and over voltage protection. It detects VDET voltage and is
stopped output Tr in abnormal condition. Details are as shown below.
External SBD open detect
In the case of external SBD is not connected to IC, the coil or internal Tr may be destructed. Therefore, at such an error
as VOUT becoming 0.1V or below, the Under Detector shown in the figure works, and turns off the output Tr, and
prevents the coil and the IC from being destructed.
And the IC changes from activation into non-activation, and current does not flow to the coil (0mA).
Over voltage protection
At such an error of output open as the output DC/DC and the LED is not connected to IC, the DC/DC will boost too much
and the VDET terminal exceed the absolute maximum ratings, and may destruct the IC. Therefore, when VDET becomes
sensing voltage or higher, the over voltage limit works, and turns off the output Tr, and the pressure up made stop.
At this moment, the IC changes from activation into non-activation, and the output voltage goes down slowly. And,
when the output voltage becomes the hysteresis of the over voltage limit or below, the output voltage pressure up to
sensing voltage once again and unless the application error is recovered, this operation is repeated.
4) Thermal shut down
BD6586MUV has thermal shut down function.
The thermal shut down works at 175°C or higher, and while holding the setting of EN1, EN2 control from the outside,
turns into non operation condition from operation condition. And at 175°C or below, the IC gets back to its normal
operation.
5) Over Current Limit
Over current flows the current detection resistor between switching transistor source and PGND, then the voltage of that
resistor turns more than detection voltage. Over current protection is operating and it is prevented from flowing more than
detection current by reducing ON duty of switching Tr without stopping boost.
As over current detector of BD6586MUV is detected peak current, current more than over current setting value does not
flow.
6) Under Voltage Lock Out(UVLO)
When VBAT declines in 2.35V (Typ.) from the condition of the power-on, DC/DC and a current driver are changed from a
state of movement to the condition at the time of the non-movement. And, it is returned in a state of movement when
VBAT is raised beyond 2.55V (Typ.).
Operating of the Application Deficiency
1) When 1 LED or 1parallel OPEN during the operating the LED parallel which became OPEN isn't lighting, but other LED
parallel is lighting.
Then, Output boosts up to the over voltage protection voltage 25.5V because LED terminal can be 0V.
After the over voltage protection is detected, LED terminal of 0V isn’t cut from feedback loop.
Then, Output voltage will become normal voltage automatically.
2) When LED short-circuited in the plural
All LED continue to be turned on, unless LED terminal voltage become more than “LED terminal over voltage protection (11.5V)”.
When it was more than 11.5V, the line which short-circuited is only turned on, and LED current of other lines decrease or turn
off.
3) When Schottky diode came off
All LED aren't turned on.
Also, IC isn't destroyed because boost operating stops by the Schottky diode coming off protected function.
4) When an output capacitor short.
All LED aren't turned on.
And, an IC isn't destroyed because boost stops by the SBD open protection function.
But, big electric current occurs, and a coil or SBD is likely to destroy it because the route of the GND short circuit of the
power supply coil output capacitor occurs.
5) When the resistance to connect it to the ISET terminal short,
All LED aren't turned on.
Because LED current limit works, all current drivers stop, and DC/DC maintains boost under the state without load.
And, it is returned in a state of normality by canceling a state of short.
www.rohm.com
© 2012 ROHM Co., Ltd. All rights reserved.
TSZ22111 15 001
5/20
TSZ02201-0G3G0C400190-1-2
10.Dec.2012 Rev.001

5 Page





BD6586MUV arduino
BD6586MUV
Datasheet
Selection of External Parts
Recommended external parts are as shown below.
When to use other parts than these, select the following equivalent parts.
Coil
Value
4.7μH
4.7μH
4.7μH
4.7μH
10μH
4.7μH
10μH
Capacitor
Manufacturer
TOKO
TOKO
TOKO
TDK
TDK
TDK
TDK
Product number
A915AY-4R7M
B1015AS-4R7M
A1101AS-4R7M
LTF5022T-4R7N2R0
LTF5022T-100M1R4
VLP6810T-4R7M1R6
VLP6810T-100M1R1
Vertical
5.2
8.4
4.1
5.0
5.0
6.3
6.3
Size
Horizontal
5.2
8.3
4.1
5.2
5.2
6.8
6.8
DC current
Height (MAX) (mA)
3.0 1870
4.0 3300
1.2 1400
2.2 2000
2.2 1400
1.0 1600
1.0 1100
DCR
()
0.045
0.038
0.115
0.073
0.140
0.167
0.350
Value Pressure Manufacturer Product number
Size
Vertical Horizontal Height
TC
Cap
Tolerance
[ Power supply capacitor ]
4.7μF 25V MURATA
4.7μF 25V MURATA
1μF 10V MURATA
4.7μF 10V MURATA
GRM319B31E475K
GRM21BR61E475K
GRM188B11A105K
GRM219B31A475K
3.2
2.0
1.6
2.0
1.6 0.85±0.1 B
1.25 1.25±0.1 X5R
0.8 0.8±0.1 B
1.25 0.85±0.1 B
+/-10%
+/-10%
+/-10%
+/-10%
[ Output capacitor ]
1μF 35V
1μF 50V
1μF 50V
2.2μF
50V
Resistor
MURATA
MURATA
MURATA
MURATA
GRM219B3YA105K
GRM31MB31H105K
GRM21BB31H105K
GRM31CB31H225K
2.0
3.2
2.0
3.2
1.25 0.85±0.1 B
1.6 1.15±0.1 B
1.25 1.25±0.1 B
1.6 1.6±0.2 B
+/-10%
+/-10%
+/-10%
+/-10%
Value Tolerance Manufacturer Product number
Vertical
Size
Horizontal
Height
[ Resistor for LED current decision <ISET pin> ]
24k
±0.5%
ROHM
MCR006YZPD243
SBD
0.6
0.3 0.23±0.03
Pressure
Manufacturer
Product number
Vertical
Size
Horizontal
Height
60V ROHM
RB160M-60
3.5 1.6 0.8±0.1
The coil is the part that is most influential to efficiency. Select the coil whose direct current resistor (DCR) and current -
inductance characteristic is excellent. BD6586MUV is designed for the inductance value of 4.7µH. Don’t use the
inductance value less than 2.2µH. Select a capacitor of ceramic type with excellent frequency and temperature
characteristics.
Further, select Capacitor to be used with small direct current resistance, and pay sufficient attention to the layout pattern
shown in Page 10.
Attention Point of PCB Layout
In PCB layout design, the wiring of power supply line should be low Impedance, and put the bypass capacitor if necessary.
Especially the wiring impedance must be lower around the DC/DC converter.
About Heat Loss
In heat design, operate the DC/DC converter in the following condition.
(The following temperature is a guarantee temperature, so consider the margin.)
1. Periphery temperature Ta must be less than 85 .
2. The loss of IC must be less than dissipation Pd.
www.rohm.com
© 2012 ROHM Co., Ltd. All rights reserved.
TSZ22111 15 001
11/20
TSZ02201-0G3G0C400190-1-2
10.Dec.2012 Rev.001

11 Page







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