BL8584
6-Channels WLED Linear Driver
DESCRIPTION
The BL8584 is a CMOS based White/Blue LED
driver with stand-alone capability. The driver is
primarily designed for LED backlighting of LCD
display powered by Li-ion battery With its high
efficiency, low standby current and wide range of
input supply voltage, the BL8584 is suitable for
applications such as portable device display and
keypad backlighting. There are six identical
channels in BL8584, each of which can drive one
LED by current rating of 20mA.
BL8584 is available with QFN 3X3-16 package
FEATURES
•
•
•
•
•
6-channels output
2.7 to 5.5V input range
PWM dimming control
LED sink current of 20mA
Independent current sink circuit for each LED
output
Low standby current
High accuracy current match on each channel
•
•
APPLICATIONS
•
•
LCD screen backlights driver
Mobile phone, portable device keypad
backlights driver
TYPICAL APPLICATION
PIN ASSIGNMENT
BL8
BL8584
BLOCK DIAGRAM
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1
BL8584
6-Channels WLED Linear Driver
MARKING INFORMATION
Product Classification
Marking
BL8584CJKTR
ORDERING INFORMATION
BL8584
□□□
1 2 3
Code
1
□
KC: Product Code
LL: LOT No.
KC
N: FAB Code
LLNYW
Y: Year No.
W: Week No.
2
□
3
□
Description
Temperature&Rohs:
C: -40~85°C, Pb Free Rohs Std.
Package type:
JK: QFN 3X3 –16
Packing type:
TR:Tape&Reel (Standard)
Top view
PIN DESCRIPTION
Name
D1-D6
EN
VIN
GND
NC
Function Description
RGB or WLED Cathode Connection Pin
Chip Enable and Dimming Control.
Pin15 and Pin16 both are EN pins, they are shorted internally, so
please don’t connect one of them to GND
Power Supply
Ground
Not Connected
ABSOLUTE MAXIMUM RATING
Supply voltage
Voltage of LEDn, EN pin
Maximum Junction Temperature
Operating Ambient Temperature Range
Storage Temperature Range
Lead Temperature (Soldering, 10 sec)
–0.3V to 7V
–0.3V to 7V
125°C
–40°C to 85°C
–40°C to 150°C
260°C
Note: Exceed these limits to damage to the device.
Note: Exposure to absolute maximum rating conditions may affect device reliability.
RECOMMENDED OPERATING CONDITIONS
Items
Supply Voltage Range
Operating Temperature
MIN
2.7
-25
MAX
5.5
85
Unit
V
°C
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2
BL8584
ELECTRICAL CHARACTERISTICS
VCC=3.7V, T
a
=25°C, No Load, Input: VEN=3.7V. (Unless otherwise noted)
Symbols
Parameters
EN Pin “Low” Logic
EN Pin “High” Logic
EN Pin “Low” Input Current
EN Pin “High” Input Current
LEDn Dropout Voltage
LEDn Sink Current
LEDn Sink Current Deviation
Quiescent Current
Standby Supply Current
VEN=”0”
Conditions
SPEC
MIN
TYP
1.7
-1
1
18
100
20
500
0.5
22
5
800
MAX
0.4
Unit
V
V
uA
uA
mV
mA
%
uA
uA
V
IL
V
IH
I
IL
I
IH
V
LEDL
I
LED
I
LEDn
I
Q
I
STBY
-5
DETAILED DESCRIPTION
BL8584 works with a wide range of supply voltage, from 2.7V to 6V. The forward voltage of commercial
white/blue LED is in the range of 2.9V to 3.5V at a current level of 20mA. Proper selection of the LED to
match the supply voltage can fully utilize the Li-ion battery. For example, there is 1% ~ 3 % power left in the
Li-ion battery when its voltage reaches 3.275V. So a LED with a forward voltage value of 3.2V can use up to
99% of the battery power under normal working condition. When the voltage of the battery drops below
3.2V, the current through the LED (hence the brightness) starts to decrease.
Due to its uniquely designed current regulator, BL8584 offers low output dropout and provide superior
efficiency performance over standard Inductive boost type and capacitive charge pump type LED driver.
The EN pin controls the on/off state of the device. A high level state turns on the device and a low level
turns off the device, results in the low off state current. This pin needs to be terminated since a floating
level of the EN pin will cause the instability of the device.
The sink current has a constant value of 20mA. The
brightness of the LED can be adjusted by controlling the duty
cycle of the BL8584’s LEDn output. This can be accomplished
by applying a PWM signal to the EN pin. In BL8584, the
internal power on sequence presents a delay time of 6us
from EN pin to LEDn pin. Hence, in order to modulate the
output of LEDn in every cycle normally, the width of dimming
signal applied EN pin have to be no less than 6us. For
example, when a dimming signal of 20KHz is applied, the
minimum range of dimming is about 12%, that is, the average
output current on each channel is 2.4mA.
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3
BL8584
TYPICAL PERFORMANCE CHARACTERISTICS
Quiescent Current vs Supply Current
(Ta=25℃)
350
Quiescent Current (uA)
300
250
200
150
100
50
0
3.0
3.5
4.0
4.5
5.0
Quiescent Current (uA)
450
400
350
300
250
200
150
100
50
0
-40 -20
0
20
40
60
80
100 120 140
Supply Voltage (V)
Temperature (℃)
Quiescent Current vs Temperature
(VCC=3.7V)
ILED vs Supply Voltage
(VCC=3.7V, VLEDn=3.2V)
22
20
ILED (mA)
18
16
14
12
10
3.3 3.4 3.5 3.6 3.7 3.8 3.9 4.0 4.1 4.2
Supply Voltage (V)
LED Current (mA)
25
20
15
10
5
0
0.01
ILED vs LEDn Dropout Voltage
(VCC=3.7V)
0.1
1
10
LEDn Dropout Voltage (V)
ILED
vs Temperature
(VCC=3.7V)
20.2
20.2
20.1
20.1
20.0
20.0
19.9
19.9
19.8
19.8
19.7
-50
-25
0
25
50
75
100
125
Temperature (℃)
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ILED (mA)
4
BL8584
PACKAGE INFORMATION
Package
QFN3X3-16
Devices per reel
3000
Unit
mm
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NXP MCU
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