BL8581 Datasheet PDF - BELLING

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BL8581
BELLING

Part Number BL8581
Description WLED Linear Driver
Page 7 Pages


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BL8580/1
WLED Linear Driver For Li-Ion Battery Application
DESCRIPTION
The BL8580/1 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 BL8580/1 is suitable for
applications such as portable device display
and keypad backlighting.
In portable application, three or four-channel
LED solutions are popular. BL8580 has three
LED channels with a SOT-23-6 package.
BL8581 has four LED channels with a MSOP-
8 package.
FEATURES
No external component required
PWM dimming control available
Low noise and EMI
LED sink current of 20mA
Independent current sink circuit for each
LED output
Versatile supply voltage range
Low standby current
High accuracy current match on each
channel
APPLICATIONS
Small Size Color LCD Backlights Driver
Mobile Phone, Portable DeviEN Keypad
Backlights Driver
TYPICAL APPLICATION
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BL8580/1
ORDERING INFORMATION
BL8580 1 2 3
Code
1
2
3
Description
Temperature&Rohs:
C: -40~85C ,Pb Free Rohs
Std.
Package type:
B6: SOT-23-6
Packing type:
TR:Tape&Reel (Standard)
BL8581 1 2 3
Code
1
2
3
Description
Temperature&Rohs:
C: -40~85C, Pb Free Rohs
Std.
Package type:
E8: MSOP-8
Packing type:
TR: Tape&Reel (Standard)
PIN DESCRIPTION
PIN CONFIGURATION
Product
Classification
Marking
BL8580CB6TR
80LL
80: Product
Code
LL: LOT
NO.
Product
Classification
BL8581CE8TR
Marking
8581
LLYW
8581:
Product
Code
LL: Lot. No
YW: Date
Code
Y: The Year of manufacturing, 9stands for year
2009, 0stands for year 2010;
W: The week of manufacturing. Astands for
week 1, Zstands for week 26, A stands for
week 27, Z stands for week 52.
Name
LED1-LEDn
EN
VCC
GND
Function Description
RGB or WLED cathode connection pin
Chip enable pin. High level activates the chip. Connect this pin to VCC if
not used, do not leave this pin floating.
Power Supply
Ground. In BL8581, for good LED current match, it is recommended to tie
the two GND pins together by external copper.
ABSOLUTE MAXIMUM RATING
Supply voltage
0.3V to 7V
Voltage of LEDn, EN pin
0.3V to 7V
Maximum Junction Temperature
125°C
Operating Ambient Temperature Range
40°C to 85°C
Storage Temperature Range
40°C to 150°C
Lead Temperature (Soldering, 10 sec)
260°C
Note: Exceed these limits to damage to the device.
Exposure to absolute maximum rating conditions may affect device reliability.
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RECOMMENDED OPERATING CONDITIONS
ITEMS
Supply Voltage Range
Output sink current on each channel
Operating Temperature
MIN
2.7
-25
NOM
BLOCK DIAGRAM
VCC
LED1
LED2
BL8580/1
MAX
6
25
85
UNIT
V
mA
LED3
LED4
EN Enable
Shunt
Regulator
(Note: Channel 4 is available only for BL8581)
GND
ELECTRICAL CHARACTERISTICS
VCC=3.7V, Ta=25C, No Load, Input: VEN=3.7V. (Unless otherwise noted)
Symbols
Parameters
Conditions
ReferenEN Data
MIN TYP MAX
Unit
VIL EN Pin “Low” Logic
0.4 V
VIH EN Pin High” Logic
1.7 V
IIL EN Pin “Low” Input Current
-1 A
IIH EN Pin “High” Input Current
1 A
VLEDL
LEDn Dropout Voltage
100 mV
ILED LEDn Sink Current
18 20 22 mA
ILEDn
LEDn Sink Current Deviation
+/-3 %
IQ Quiescent Current
250 400 A
ISTBY
Standby Supply Current
VEN=”0”
0.5 A
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DETAILED DESCRIPTION
BL8580/1 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,
BL8580/1 offer low output dropout and
provide superior efficiency performance over
standard Inductive boost type and capacitive
charge pump type LED driver.
BL8580/1
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
BL8580/1s LEDn output. This can be
accomplished by applying a PWM signal to
the EN pin. In BL8580/1, the internal power
on sequence presents a delay time of 6us
from EN pin to LEDn pin. Hence, In order to
normally modulate the output of LEDn in
every cycle, 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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