Document
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
TYPICAL APPLICATION
BL8584
6-Channels WLED Linear Driver
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
PIN ASSIGNMENT
BL8584
BLOCK DIAGRAM
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MARKING INFORMATION
Product Classification Marking
BL8584CJKTR
KC: Product Code
KC LLNYW
LL: LOT No. N: FAB Code Y: Year No.
W: Week No.
Top view
BL8584
6-Channels WLED Linear Driver
ORDERING INFORMATION
BL8584 □1 □2 □3
Code
□1 □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)
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
MAX
Unit
2.7 5.5 V
-25 85 °C
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BL8584
ELECTRICAL CHARACTERISTICS
VCC=3.7V, Ta=25°C, No Load, Input: VEN=3.7V. (Unless otherwise noted)
Symbols
VIL VIH IIL IIH VLEDL ILED ILEDn IQ ISTBY
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
Conditions
MIN
1.7 -1
VEN=”0”
18 -5
SPEC TYP
100 20 500 0.5
MAX 0.4
1
22 5 800
Unit
V V uA uA mV mA % uA uA
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 it.