BL8580/1 WLED Linear Driver For Li-Ion Battery Application DESCRIPTION FEATURES 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 MSOP8 package. 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 BL8581 www.belling.com.cn 1 BL8580/1 ORDERING INFORMATION BL8580 □ 1 □ 2 □ 3 Code PIN CONFIGURATION Product Classification Description Temperature&Rohs: C: -40~85C ,Pb Free Rohs Std. Package type: B6: SOT-23-6 Packing type: TR:Tape&Reel (Standard) 1 □ 2 □ 3 □ Marking 80LL Description 2 □ 3 □ LL: LOT NO. BL8581CE8TR Marking Temperature&Rohs: C: -40~85C, Pb Free Rohs Std. Package type: E8: MSOP-8 Packing type: TR: Tape&Reel (Standard) 1 □ 80: Product Code Product Classification BL8581 □ 1 □ 2 □ 3 Code BL8580CB6TR 8581: Product Code 8581 LLYW LL: Lot. No YW: Date Code Y: The Year of manufacturing, ”9” stands for year 2009, ”0” stands for year 2010; W: The week of manufacturing. ”A” stands for week 1, ”Z” stands for week 26, ” A ” stands for week 27, ” Z ” stands for week 52. PIN DESCRIPTION Name LED1-LEDn EN 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. VCC Power Supply GND Ground. In BL8581, for good LED current match, it is recommended to tie the two GND pins together by external copper. ABSOLUTE MAXIMUM RATING –0.3V to 7V –0.3V to 7V 125°C –40°C to 85°C –40°C to 150°C 260°C Supply voltage Voltage of LEDn, EN pin Maximum Junction Temperature Operating Ambient Temperature Range Storage Temperature Range Lead Temperature (Soldering, 10 sec) Note: Exceed these limits to damage to the device. Exposure to absolute maximum rating conditions may affect device reliability. www.belling.com.cn 2 BL8580/1 RECOMMENDED OPERATING CONDITIONS ITEMS MIN Supply Voltage Range Output sink current on each channel Operating Temperature NOM MAX UNIT 6 25 85 V mA ℃ 2.7 -25 BLOCK DIAGRAM LED1 VCC EN LED2 LED4 LED3 Enable Shunt Regulator GND (Note: Channel 4 is available only for BL8581) ELECTRICAL CHARACTERISTICS VCC=3.7V, Ta=25C, No Load, Input: VEN=3.7V. (Unless otherwise noted) Symbols Parameters VIL VIH IIL IIH VLEDL ILED ILEDn IQ ISTBY EN Pin “Low” Logic EN Pin “High” Logic ReferenEN Data Unit MIN TYP MAX 0.4 V 1.7 V EN Pin “Low” Input Current -1 Conditions EN Pin “High” Input Current LEDn Dropout Voltage LEDn Sink Current LEDn Sink Current Deviation 100 20 A mV 22 mA +/-3 % 250 400 1 18 Quiescent Current VEN=”0” Standby Supply Current www.belling.com.cn A 3 0.5 A A BL8580/1 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. 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 BL8580/1’s 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. 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. www.belling.com.cn 4 BL8580/1 TYPICAL PERFORMANEN CHARACTERISTICS Quiescent Current vs Temperature (VCC=3.7V) 350 Quiescent Current (uA) Quiescent Current (uA) Quiescent Current vs Supply Current (Ta=25℃) 300 250 200 150 100 50 0 3.0 3.5 4.0 4.5 450 400 350 300 250 200 150 100 50 0 5.0 -40 -20 Supply Voltage (V) 20 40 60 80 100 120 140 Temperature (℃) ILED vs LEDn Dropout Voltage (VCC=3.7V) ILED vs Supply Voltage (VCC=3.7V, VLEDn=3.2V) 25 22 LED Current (mA) 20 ILED (mA) 0 18 16 14 12 20 15 10 5 10 0 0.01 3.3 3.4 3.5 3.6 3.7 3.8 3.9 4.0 4.1 4.2 ILED (mA) 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 (℃) www.belling.com.cn 0.1 1 LEDn Dropout Voltage (V) Supply Voltage (V) 5 10 BL8580/1 PACKAGE LINE Package SOT-23-6 DeviENs per reel 3000Pcs Package dimension： www.belling.com.cn 6 Unit mm BL8580/1 PACKAGE LINE Package MSOP-8 Devices per reel 3000Pcs Unit mm Package specification： Symbol Dimension (mm) MIN NOM MAX A - - 1.10 A1 0.05 - A2 0.75 A3 Symbol Dimension (mm) MIN NOM MAX D 2.9 3.0 3.1 0.15 E 4.7 4.9 5.1 0.85 0.95 E1 2.9 3.0 3.1 0.30 0.35 0.40 e b 0.29 - 0.38 L b1 0.28 0.30 0.33 L1 c 0.15 - 0.20 c1 0.14 0.152 0.16 www.belling.com.cn 7 0.65BSC 0.4 - 0.7 0.95BSC 0 - 8°