Data Sheet 4-Channel Charge Pump LED Driver with Current Balancing and Wide Range PWM Dimming AP3605 General Description Features The AP3605 is a step-up DC/DC converter based on 1.5x charge pump current source, it is specially designed for LED supplies in backlight display. · · · · · · · · The AP3605 can provide constant current up to 20mA for each LED, which is programmed by an external resistor, so it has a total capability to provide 80mA for 4 LEDs. The chip has a good performance of LED current matching and allows PWM brightness dimming control. Additionally, high switching frequency up to 1MHz enables the use of two small external flying capacitors. Internal soft-start circuitry prevents excessive inrush current during start-up. · · · The AP3605 supply voltage range is from 2.7V to 5.5V, ideally suited for applications powered by the Liion battery. Regulated Output Current with ±3% Matching Regulated ±10% Output Current Source Drive up to 4 LEDs at 20mA Each Wide Operating Voltage Range: 2.7V to 5.5V High Efficiency up to 93% High Operating Frequency: 1MHz Built-in Soft-Start to Limit the Inrush Current LED Brightness Control through PWM and Analog Signal PWM Dimming Frequency up to 50kHz Built-in Standby Mode to Get PWM Dimming Duty Cycle Control Linearity Built-in OTSD (Over Temperature Shutdown) Function to Protect the Device from Burn Out Applications The AP3605 is available in a 3mmx3mm QFN-3x3-16 tiny package. Its operating temperature range is -40oC · · · to 85oC. Mobile Phone MP3, MP4 White LED Backlight in Mobile Phone, PDA QFN-3x3-16 Figure 1. Package Type of AP3605 Jun. 2010 Rev. 1. 7 BCD Semiconductor Manufacturing Limited 1 Data Sheet 4-Channel Charge Pump LED Driver with Current Balancing and Wide Range PWM Dimming AP3605 Pin Configuration FN Package (QFN-3x3-16) Pin 1 Dot by Marking D4 1 VOUT1 2 PGND 3 C2- 4 D3 D2 D1 VIN2 16 14 15 13 EP 5 6 7 12 EN 11 ISET 10 AGND 9 C1+ 8 VIN1 C1- C2+ VOUT2 Exposed PAD, Connected to AGND Note: Pin 2 should be connected with Pin 8 and Pin 5 should be connected with Pin 13 on PCB board. Figure 2. Pin Configuration of AP3605 (Top View) Pin Description Pin Number Pin Name 1, 16, 15, 14 D4 to D1 2, 8 VOUT1, VOUT2 3 PGND 4 C2- 5, 13 VIN1, VIN2 6 C1- 7 C2+ 9 C1+ 10 AGND 11 ISET 12 EN Function Current Source Output. Connect the anode of the white LEDs to these outputs Output Pin 1 and 2, must be connected together. The output capacitor should be placed closely to these pins Power Ground. Connect this pin with power ground plane Flying Capacitor 2 Negative Terminal. The flying capacitor 2 should be connected as close to this pin as possible Supply Voltage Input 1 and 2, must be connected together Flying Capacitor 1 Negative Terminal. The flying capacitor 1 should be connected as close to this pin as possible Flying Capacitor 2 Positive Terminal. The flying capacitor 2 should be connected as close to this pin as possible Flying Capacitor 1 Positive Terminal. The flying capacitor 1 should be connected as close to this pin as possible Analog Ground. Connect this pin with control signal ground plane. PGND, AGND and the exposed PAD should be connected together Current Source Set Pin. Connect a resistor between this pin and GND to set the maximum LED current Enable Control Input. Logic high enables the IC; while logic low forces the device into shutdown mode to reduce the supply current to less than 1µA. Add a PWM signal to this pin to achieve brightness control Jun. 2010 Rev. 1. 7 BCD Semiconductor Manufacturing Limited 2 Data Sheet 4-Channel Charge Pump LED Driver with Current Balancing and Wide Range PWM Dimming AP3605 Functional Block Diagram C2- C2+ 4 7 C1- C1+ VOUT2 VOUT1 6 9 2 8 14 VIN1 5 LDO 15 1.5x Charge Pump 4-Channel Current Source Soft Start 1MHz OSC OTSD Standby 1 11 + Error AMP _ 16 VIN2 13 Voltage Reference 12 3 D1 D2 D3 D4 ISET EN 10 PGND AGND Figure 3. Functional Block Diagram of AP3605 Ordering Information AP3605 - Circuit Type E1: RoHS Package TR: Tape and Reel FN: QFN-3x3-16 Package Temperature Range Part Number QFN-3x3-16 -40 to 85oC AP3605FNTR-E1 (Note 1) Marking ID F1A Packing Type Tape & Reel Note 1: AP3605FNTR-E1 is a green product. Jun. 2010 Rev. 1. 7 BCD Semiconductor Manufacturing Limited 3 Data Sheet 4-Channel Charge Pump LED Driver with Current Balancing and Wide Range PWM Dimming AP3605 Absolute Maximum Ratings (Note 2) Parameter Symbol Value Unit Input Voltage VIN -0.3 to 6 V EN Pin Voltage VEN -0.3 to 6 V VOUT1 Pin Voltage VOUT1 -0.3 to 6 V VOUT2 Pin Voltage VOUT2 -0.3 to 6 V ISET Pin Voltage VISET -0.3 to 6 V Output Current at VOUT2 Pin IOUT2 150 mA Thermal Resistance (Junction to Ambient, no Heat sink) RθJA 60 TJ 150 TSTG -65 to 150 oC TLEAD 260 oC 2000 V Operating Junction Temperature Storage Temperature Range Lead Temperature (Soldering, 10sec) ESD (Human Body Model) o C/W o C Note 2: Stresses greater than those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated under "Recommended Operating Conditions" is not implied. Exposure to "Absolute Maximum Ratings" for extended periods may affect device reliability. Recommended Operating Conditions Parameter Symbol Min Max Unit Input Voltage VIN 2.7 5.5 V Operating Temperature TA -40 85 o RISET 1.44 Current Source Set Resistor Jun. 2010 Rev. 1. 7 C kΩ BCD Semiconductor Manufacturing Limited 4 Data Sheet 4-Channel Charge Pump LED Driver with Current Balancing and Wide Range PWM Dimming AP3605 Electrical Characteristics (VIN=3.5V, VEN=VIN, RISET=1.8kΩ, CFLY1=CFLY2=CIN=COUT=1µF, TA=25oC, VD1=VD2=VD3=VD4=3.4V, unless otherwise specified. ) Parameter Symbol Conditions Min Typ Max Unit 5.5 V Input Section Input Voltage VIN ID=0 to 40 mA Supply Current ICC No Load, ISET floating 1.5 2.5 mA VEN=GND 0.1 1 µA 1 1.35 MHz Shutdown Supply Current ISHDN 2.7 Charge Pump Section Switching Frequency Efficiency fOSC η 0.65 VIN=3.5V, ID=40mA Total 93 % Current Source Section Maximum Output Current per Source IDX 3.2V≤VIN≤5.5V, 22 mA -3 3 % 3.5V≤VIN≤5.5V -2 2 %/V 3.0V≤VD≤4.0V, VIN=3.5V -5 5 % V TA=-40oC to 85oC Current Matching between Any I D-MATCH Two Outputs Output Current Line Regulation (∆ID/ID)/ ∆V 18 20 Current Matching between Any Two Outputs under Different LED Forward Voltage ∆ID/ID Reference Voltage for Current Set VISET 1.193 1.23 1.267 K 100 120 140 EN High Level Threshold Voltage VIH 1.4 EN Low Level Threshold Voltage VIL EN Input Leakage Current IEN EN Low Threshold Time for Standby State tSTB ID to ISET Current Ratio Enable Section VEN=5.5V V -1 0.5 V 1 µA 2 ms 400 µs Total Device Soft-Start Time tSS ID=80mA Total Thermal Shutdown TOTSD 160 oC Thermal Shutdown Hysteresis THYS 20 oC Jun. 2010 Rev. 1. 7 BCD Semiconductor Manufacturing Limited 5 Data Sheet 4-Channel Charge Pump LED Driver with Current Balancing and Wide Range PWM Dimming AP3605 Typical Performance Characteristics (VIN=3.5V, VEN=VIN, RISET=1.8kΩ, CFLY1=CFLY2=CIN=COUT=1µF, TA=25oC, VD1=VD2=VD3=VD4=3.4V, unless otherwise specified. VOUT is the output voltage when VOUT1 and VOUT2 are connected.) 1.6 1.25 VIN=3.5V, No Load, RISET Open 1.20 1.4 Supply Current (mA) Supply Current (mA) 1.5 1.30 1.3 1.2 1.1 1.0 0.9 -50 1.15 1.10 1.05 1.00 0.95 -25 0 25 50 75 100 125 0.90 2.5 150 RISET Open 3.0 3.5 4.0 4.5 5.0 5.5 Input Voltage (V) O Junction Temperature ( C) Figure 4. Supply Current vs. Junction Temperature Figure 5. Supply Current vs. Input Voltage 1.25 1.250 1.20 1.245 1.15 1.240 1.05 VISET (V) Frequency (MHz) 1.10 1.00 0.95 1.235 1.230 1.225 0.90 1.220 0.85 0.75 -50 1.215 VIN=3.5V 0.80 -25 0 25 50 75 100 125 1.210 -50 150 -25 0 25 50 75 100 125 150 O O Junction Temperature ( C) Junction Temperature ( C) Figure 6. Frequency vs. Junction Temperature Figure 7. Reference Voltage vs. Junction Temperature Jun. 2010 Rev. 1. 7 BCD Semiconductor Manufacturing Limited 6 Data Sheet 4-Channel Charge Pump LED Driver with Current Balancing and Wide Range PWM Dimming AP3605 Typical Performance Characteristics (Continued) (VIN=3.5V, VEN=VIN, RISET=1.8kΩ, CFLY1=CFLY2=CIN=COUT=1µF, TA=25oC, VD1=VD2=VD3=VD4=3.4V, unless otherwise specified. VOUT is the output voltage when VOUT1 and VOUT2 are connected.) 5.1 1.10 1.05 5.0 1.00 Output Voltage (V) VIH and VIL (V) 0.95 0.90 0.85 0.80 0.75 0.70 VIH VIL 0.65 0.60 2.5 3.0 3.5 4.0 4.5 5.0 4.9 4.8 4.7 4.6 4.5 5.5 0 20 Input Voltage (V) 80 100 120 Figure 9. Output Voltage vs. Output Current 80 80 ID=20mA ID=40mA 70 ID=60mA ID=80mA ID=20mA ID=40mA 70 ID=60mA ID=80mA 60 IDIODE (mA) 60 IDIODE (mA) 60 Output Current (mA) Figure 8. VIH and VIL vs. Input Voltage 50 40 50 40 30 30 20 20 2.5 40 3.0 3.5 4.0 4.5 5.0 3.0 5.5 3.2 3.4 3.6 3.8 4.0 VDIODE (V) Input Voltage (V) Figure 10. IDIODE vs. Input Voltage Figure 11. IDIODE vs. VDIODE Jun. 2010 Rev. 1. 7 BCD Semiconductor Manufacturing Limited 7 Data Sheet 4-Channel Charge Pump LED Driver with Current Balancing and Wide Range PWM Dimming AP3605 Typical Performance Characteristics (Continued) 100 100 95 95 90 90 85 85 80 80 Efficiency (%) Efficiency (%) (VIN=3.5V, VEN=VIN, RISET=1.8kΩ, CFLY1=CFLY2=CIN=COUT=1µF, TA=25oC, VD1=VD2=VD3=VD4=3.4V, unless otherwise specified. VOUT is the output voltage when VOUT1 and VOUT2 are connected.) 75 70 65 75 70 65 60 60 55 55 50 0 20 40 60 80 100 IOUT=20mA IOUT=40mA IOUT=60mA IOUT=80mA IOUT=100mA IOUT=120mA 50 2.5 120 3.0 3.5 4.0 4.5 5.0 5.5 Input Voltage (V) Output Current (mA) Figure 12. Efficiency vs. Output Current Figure 13. Efficiency vs. Input Voltage VEN VEN VOUT VD VOUT VD IIN IIN Figure 14. Turn on Characteristic Figure 15. Turn off Characteristic Jun. 2010 Rev. 1. 7 BCD Semiconductor Manufacturing Limited 8 Data Sheet 4-Channel Charge Pump LED Driver with Current Balancing and Wide Range PWM Dimming AP3605 Typical Performance Characteristics (Continued) (VIN=3.5V, VEN=VIN, RISET=1.8kΩ, CFLY1=CFLY2=CIN=COUT=1µF, TA=25oC, VD1=VD2=VD3=VD4=3.4V, unless otherwise specified. VOUT is the output voltage when VOUT1 and VOUT2 are connected.) VIN VIN VOUT VOUT ID ID VD VD Figure 16. Output Ripple @ ID=40mA Figure 17. Output Ripple @ ID=80mA Jun. 2010 Rev. 1. 7 BCD Semiconductor Manufacturing Limited 9 Data Sheet 4-Channel Charge Pump LED Driver with Current Balancing and Wide Range PWM Dimming AP3605 Operation up to 20mA of current. The maximum LED current is set by a resistor connected to the ISET pin which programs a reference current, then the reference current is mirrored to set the LED current. The AP3605 is a high efficiency 1.5x fractional charge pump with 4 channels of integrated current source for white LED backlight applications. The AP3605 consists of a linear regulator followed by a 1.5x charge pump which operates at 1MHz, 4 channels current source, a reference and other control circuits. The linear regulator regulates its output voltage to supply charge pump, guarantees that the charge pump always operates at 5V output with 1.5x mode. This configuration minimizes the output ripple. Applying a PWM signal to the EN pin can be used to achieve LED brightness dimming. Integrated 2ms standby function helps to enhance the dimming control. Detailed descriptions please see the related application note. The charge pump can generate 80mA of output current, so each of the 4 WLED can be powered with Typical Application EN PWM Dimming 1kHz to 50kHz Li-ion Battery CIN COUT 1µF 1µF C1 1µF C2 1µF C1+ C1- C2+ C2- EN D1 VIN D2 AP3605 V OUT1 D3 V OUT2 D4 ISET GND RISET Figure 18. AP3605 Typical Application Circuit with 4 WLEDs Jun. 2010 Rev. 1. 7 BCD Semiconductor Manufacturing Limited 10 Data Sheet 4-Channel Charge Pump LED Driver with Current Balancing and Wide Range PWM Dimming AP3605 Typical Application (Continued) EN Li-ion Battery PWM Dimming 1kHz to 50kHz CIN COUT 1µF 1µF C1 1µF C2 1µF C1+ C1- C2+ C2- EN D1 VIN D2 AP3605 VOUT1 D3 VOUT2 D4 ISET GND RISET Figure 19. AP3605 Typical Application Circuit with 3 WLEDs Jun. 2010 Rev. 1. 7 BCD Semiconductor Manufacturing Limited 11 Data Sheet 4-Channel Charge Pump LED Driver with Current Balancing and Wide Range PWM Dimming AP3605 Mechanical Dimensions Unit: mm(inch) QFN-3x3-16 2.900(0.114) 3.100(0.122) Pin 1 Identification Pin 1 Identification Pin1 0.300(0.012) 0.500(0.020) 0.180(0.007) 2.900(0.114) 3.100(0.122) 0.280(0.011) 0.500(0.020) BSC Bottom View Exposed Pad 1.700(0.068) Ref 1.700(0.068) Ref 0.700(0.028) 0.900(0.035) 0.178(0.007) 0.228(0.009) 0.000(0.000) 0.050(0.002) Jun. 2010 Rev. 1. 7 BCD Semiconductor Manufacturing Limited 12 BCD Semiconductor Manufacturing Limited http://www.bcdsemi.com IMPORTANT NOTICE IMPORTANT NOTICE BCD Semiconductor BCD Semiconductor Manufacturing Manufacturing Limited Limited reserves reserves the the right right to to make make changes changes without without further further notice notice to to any any products products or or specifispecifications herein. cations herein. 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