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| Solved by SP6415 TM Integrated White LED Driver With Organic LED Display Power Supply * * * * * * * * Integrated OLED and White-LED Driver 0 8 7 Wide Input Voltage Range: 2.7V to 5.5V Adjustable output voltage up to 20V Complete Protection: OVP, OTP, UVP SP6415 PWM Dimming Control Small External Components 2 3 4 Cycle-By-Cycle Current Limit Lead Free, RoHS Compliant Applications Packaging: 0Pin DFN Hand-held Devices Digital Cameras Flip-phones / Clam-shell Cellular Phones High-fashion cellular phones DFN-10 (3mmx3mmx0.85mm) Top View 6 5 White LED Back-Lighting DESCRIPTION The SP645 is a dual Boost DC/DC converter, designed to drive up to 4 white LEDs with a constant current and to power an organic LED display with a constant voltage. According to the SEL pin status, the SP6415 either regulates output current flowing through series connected LEDs or regulates output voltage applying to the OLED. A single external resistor is used to set the maximum LED current. The LED current can be adjusted by applying a PWM signal to the EN pin. Pulling the EN pin to GND disables the chip and reduces the supply current to less than uA. Additional features include a low-side NFET switch that can turn off the LED string with no DC current path to ground. Other features include OVP, OCP, UVP and OTP. The SP645 is available in a small (3mmx3mmx0.85mm) DFN-0 package. TYPICAL APPLICATION CIRCUIT V IN 2.7V~4.2V CIN 4.7F VIN OVP ILED VFB ILED= RFB CH2 0.2 R FB L 0H D Main Display COUT 4.7F VIN 2.7V~4.2V C IN 4.7F L 0H D Main Display COUT 4.7F SW VIN SW OVP CH >.5V 0V Main V SUB SEL GND FB2 EN FB SP6415 ILED CH FB >.5V SP6415 EN CH2 VFB ILED= R FB VSUB C OUT2 4.7F Main VSUB SEL GND FB2 VFB2 RFB2 0.2 RFB 47pF RSUB 0V OLED SUB Display RSUB2 VSUB RSUB1 = 1 + x1.23 RSUB 2 ILED2 ILED2= .23 RFB2 Figure . Main LEDs Display and OLED SUB Display Feb27-07 Rev K Figure 2. 4 LEDs for Main Panel and 3 LEDs for SUB Panel (c) 2007 Sipex Corporation Integrated White LED Driver With Organic LED Display Power Supply Absolute Maximum Ratings Parameter Input Supply Voltage EN, FB Voltages SW Voltage ESD Classification Symbol VIN VEN ,VFB VSW Maximum 6 VIN 30 A* Unit V Caution: Stress above the listed absolute rating may cause permanent damage to the device. * HBM A: 0V ~ V Recommended Operating Conditions Parameter Input Supply Voltage Ambient Temperature Range Junction Temperature Range Symbol VIN TA TJ Rating 2.7 to 5.5 -40 to +85 -40 to +25 Unit V o C Thermal Information Parameter Thermal Resistance (Junction to Ambient) Internal Power Dissipation Package Die Attach Symbol Maximum JA PD 48 2 50 350 Unit o DFN-0 Conductive Epoxy (3x3x0.85)(mm) C/W W o o Maximum Junction Temperature Solder Iron (0 Sec)** C C * MIL-STD-202G 20F Feb27-07 Rev K Integrated White LED Driver With Organic LED Display Power Supply (c) 2007 Sipex Corporation 2 Electrical Specifications VIN=3.6V, EN = VIN,T A= 25oC unless otherwise noted. Parameter Input Voltage Range Symbol VIN Test Condition TA = -40 C to +85 C FB = 0.3 (Not Switch) FB = 0. (Switching) FB = .3V (Not Switch) FB = .5V (Switching) TA = 25 C TA = -40 to 85 C TA = 25 C TA = -40 to 85oC TA = 25 C TA = -40 to 85 C TA = 25 C TA = -40 to 85oC EN = 0V TA = -40 to 85 C TA = -40 to 85 C TA= 25 oC TA= -40 to 85 C TA= -40 to 85 C o o o o o o o o o o o o Min 2.7 Typ 50 50 50 50 0.05 Max Units 5.5 200 300 250 400 200 300 250 400 2 0.23 .26 400 400 .6 0 8 ns 2.3 23 V o V Main Display Quiescent Current IQ(Main) A SUB Display Quiescent Current IQ(SUB) A Shutdown Current FB Feedback Voltage FB2 Feedback Voltage Switch Current Limit Main_Switch RDSON, N PMOS Switch RDSON, P NMOS Switch RDSON, N2 Switch off time Input Under Voltage Lockout Output Over Voltage Protection Over Temperature Protection Over Temperature Hysteresis Main Switch Leakage N PMOS Switch Leakage P NMOS Switch Leakage N2 EN Input Threshold (Low) (Shutdown) EN Input Threshold (High) (Enable the device) Sel Low Level Voltage Enable SUB Display Disable Main Display Sel High Level Voltage Enable Main Display Disable SUB Display Feb27-07 Rev K ISD V FB V FB2 ICL A V mA 0.2 .2 300 280 0.2 .23 350 0.6 RDSON tOFF UVP OVP OTP OTH ISW 8 6 400 TA= -40 to 85 oC TA= -40 to 85 C o .7 2 2 22 60 20 0. C 2 0.4 V A VSW = 5V 0.5 0.5 EN Threshold TA= -40 to 85 oC .5 0.3 SEL Threshold TA= -40 to 85 C .5 o V Integrated White LED Driver With Organic LED Display Power Supply (c) 2007 Sipex Corporation 3 Functional Block Diagram L V IN D Main Display OVP VIN SW 0 OVP COMP C XEnable Vref Enable UVP COMP UVP REF CL 2 EN CIN OTP Adjust CL COMP 400ns one shut Current sensing N2 OVP REF 5 CH FB Logic Driver N P Driver 4 RFB 3 SEL Select Logic ref CH2 8 ref2 FB2 7 6 GND CP Organic LED Figure 3. SP645 Functional Block Diagram Feb27-07 Rev K Integrated White LED Driver With Organic LED Display Power Supply (c) 2007 Sipex Corporation 4 Pin Configuration DFN-10 (3mmx3mmx0.85mm) Top View 0 8 7 6 Note : The area enclosed by dashed line represents Exposed Pad and connects to gND. * Die Attach: Conductive Epoxy _ ^ SP6415 2 3 4 5 Pin Description Pin Number 2 3 4 5 6 7 8 0 Pin Name VIN EN SEL FB CH GND FB2 CH2 OVP SW Input Voltage. Pin Description Shutdown control input, active low. The shutdown pin is an active low control. Tie this pin above .5V to enable the device. Tie this pin below 0.4V to turn off the device. Selection Pin. Internal MOSFET selection. Pull low to turn on the internal CH. Pull high to turn on CH2. Main Display Feedback. Main Display Return Voltage Ground. SUB Display Feedback. SUB Display Power Supply Voltage. Over Voltage Protection. This is the switch pin and is connected to the drain of the internal NMOS power switch N. R VSUB = 1 + SUB1 x 1.23 R SUB2 Feb27-07 Rev K Integrated White LED Driver With Organic LED Display Power Supply (c) 2007 Sipex Corporation 5 Detailed Description The SP645 is designed for white LED & OLED backlighting in mobile phone applications. It has a main display loop which can drive up to 4 white LEDS in series and a SUB display loop which is designed to drive OLED up to 20V/0mA or 3 white LEDs. The SP645 operates at a wide input voltage range suitable for Li-ion battery and has a constant off time for smaller inductor and capacitors. The block diagram refers the operation circuit. By SEL pin, it can choose the different channel to turn on CH or CH2. Current Limit Protection The SP645 has current limiting protection to prevent excessive stress on itself and external components during overload conditions. The internal current limit comparator will disable the NMOS power device at a typical switch peak current limit of 300mA. Output Over-Voltage Protection The SP645 contains dedicated circuitry for monitoring the output voltage. In the event that the primary LED network is disconnected the output will increase and be limited to 22V(typ.). There is a ~V hysteresis associated with this circuitry, which will turn the NMOS off when the output voltage is at 23V(max.) until the output voltage reach 2V(typ.) or lower. The 22V limit allows the use of 25V F ceramic output capacitors creating an overall small solution for white LED applications. Under Voltage Protection The SP645 has a UVP comparator to turn the NMOS power device off in case the input voltage or battery voltage is too low,preventing an on state of the power device conducting large amounts of current. There is a ~V hysteresis associated with this circuitry, which will turn the NMOS off when the output voltage is at 23V(max.) until the output voltage reaches 2V(typ.) or lower. The 22V limit allows the use of 25V mF ceramic output capacitors creating an overall small solution for white LED applications. Application Information Inductor Selection The recommended value of inductor for SP645applications is 0uH. Small size and better efficiency are the major concerns for portable device, such as SP645 used for dual panel mobile phone. The inductor should have low DCR for better efficiency. To avoid inductor saturation, current rating should be at least 600mA. The input range is 2.7V to 5.5V. Capacitor Selection A 4.7F input capacitor can reduce input ripple. For better voltage stability, to increase the input capacitor value or using an LC filter is feasible, especially in LiIon battery applications. The input capacitor acts as a bypass to the IC and needs to be connected directly to the VIN pin and the GND pin for proper low ripple regulation. Diode Selection The output capacitor needs to be a minimum of uF with 25V rating. For applications with 5V input, an output capacitor of 2.2uF or 4.7uF may be needed to lower output ripple and improve regulation. For better voltage filtering, ceramic capacitors with low ESR are recommended. X5R and X7R types are suitable because of their wider voltage and temperature ranges. A Schottky diode is a good choice for SP645 because of its lower forward voltage drop and faster reverse recovery. Using Schottky diodes can help obtain better efficiency. High speed rectification is also a good characteristic of Schottky diodes for high switching frequency. Current rating of the diode must meet the root mean square of the peak current and output average current multiplication. Feb27-07 Rev K Integrated White LED Driver With Organic LED Display Power Supply (c) 2007 Sipex Corporation 6 Typical Performance Characteristics Feedback Voltage vs. VIN(4LEDs) 0.25 0.23 0.2 .5 .4 EN Threshold vs. VIN mA 0mA .3 EN Threshold (V) .2 . .0 VFB (V) 0. 0.7 20mA TA=-40o C 0. 0.8 0.7 0.6 0.5 0.5 0.3 0. 2.7 TA=85 oC T A=25oC 3 3.3 3.6 3. 4.2 4.5 4.8 5. 5.5 VIN(V) 0.4 2.5 3 3.5 VIN (V) 4 4.5 5 5.5 Feedback Voltage vs. VIN(3LEDs) 0.27 0.27 Feedback Voltage vs. VIN(3LEDs) COUT= 4.7F 0.25 COUT = F 0.25 VFB ( V ) 20mA 0.2 VFB ( V ) 0.23 mA 0mA 0.23 0.2 mA 20mA 0. 30mA 0. 0mA 30mA 0.7 2.7 3 3.3 3.6 3. VIN( V ) 4.2 4.5 4.8 5. 5.5 0.7 2.7 3 3.3 3.6 3. VIN( V ) 4.2 4.5 4.8 5. 5.5 Main Display Efficiency ( 4LEDs ) 0 0 Main Display Efficiency ( 4LEDs ) Inductor=22H 85 Inductor=0H 85 VIN=4.2V VIN=3.6V VIN=3V VIN=4.2V 80 Efficiency (%) VIN=3.6V 80 75 75 70 65 70 VIN =3V 65 60 4 Load Current ( mA ) 7 0 3 6 60 4 Load Current ( mA ) 7 0 3 6 Feb27-07 Rev K Integrated White LED Driver With Organic LED Display Power Supply (c) 2007 Sipex Corporation 7 Typical Performance Characteristics Main Display Efficiency ( 3LEDs ) 0 85 Main Display Efficiency ( 3LEDs ) Inductor=0H Inductor=22H 85 VIN =3V 80 Efficiency (%) Efficiency (%) 80 VIN=3.6V VIN=3V 75 VIN=4.2V 75 70 VIN=4.2V 70 65 65 VIN=3.6V 60 4 Load Current (mA) 7 0 3 6 60 4 Load Current ( mA ) 7 0 3 6 Sub Display Efficiency( VSUB=12V) 85 Sub Display Efficiency (V SUB=12V) 0 VIN =4.2V 80 75 70 65 60 55 50 VIN=3.6V 85 VIN=3.6V VIN=5.0V Efficiency (%) Efficiency (%) VIN=3.3V VIN=2.5V 80 VIN=2.5V 75 VIN=3.3V 70 VIN=4.2V 65 Inductor=0H 4 Inductor=22H 60 4 Load Current (mA ) 7 0 3 6 Load Current (mA ) 7 0 3 6 Sub Display Efficiency( VSUB=20V) 0 85 80 Sub Display Efficiency( VSUB=20V ) 85 VIN=4.2V VIN=5.0V VIN=3.3V VIN=3.6V 80 75 70 65 60 55 50 VIN=4.2V V IN=3.3V 75 70 65 60 55 50 4 7 0 VIN=2.5V Efficiency (%) Efficiency (%) V IN=3.6V V IN=2.5V Inductor=22H Inductor=0H 4 Load Current (mA) 3 6 Load Current (mA ) 7 0 3 6 Feb27-07 Rev K Integrated White LED Driver With Organic LED Display Power Supply (c) 2007 Sipex Corporation 8 Typical Performance Characteristics Sub Enable Current vs. VIN (Part not Switching) TA=85 oC 300 300 Main Enable Current vs. VIN (Part Switching) TA=85 oC Enable Current (A) Enable Current (A) 250 250 200 200 50 00 T A=-40oC TA=-40 oC 50 00 50 0 2.5 TA=25 oC 50 0 2.5 TA=25 oC 3 3.5 VIN(V) 4 4.5 5 5.5 3 3.5 VIN(V) 4 4.5 5 5.5 300 Main Disable Current vs. VIN (Part Switching) T A=85oC 300 Sub Disable Current vs. VIN (Part not Switching) TA=85 oC Disable Current (A) 200 Disable Current (A ) 250 250 200 50 TA=-40 C o 50 TA=-40 oC 00 00 50 T A=25oC T A=25oC 50 0 2.5 3 3.5 VIN( V ) 4 4.5 5 5.5 0 2.5 3 3.5 VIN(V) 4 4.5 5 5.5 Switch RDSONvs. V IN .6 .5 Input Under Voltage Lockout vs. Temp. 2.3 .3 Turn On / Turn Off (V) .4 2.2 Main Display 4LEDs ILED=20mA VOUT=2V RDSON () .2 . .0 0. 0.8 0.7 0.6 0.5 2.5 3 3.5 4 4.5 5 5.5 2. 2.0 . TON .8 TOFF -20 0 TA=85 oC TA=25 oC TA=-40o C VIN (V) .7 -40 Temperature (oC) 20 40 60 80 00 Feb27-07 Rev K Integrated White LED Driver With Organic LED Display Power Supply (c) 2007 Sipex Corporation Typical Performance Characteristics Typical Switching Waveform Typical Switching Waveform 2 2 3 3 V OUT =2V, V IN=2.5V; 4LEDs IOUT =0mA (RFB=20 ) ) V SW= 20V/div,DC 2) V OUT , 00mV / div,AC 3) Inductor Current, 200mA / div,DC T= 0S / div Inductor=0H, COUT =4.7F V OUT =2V, V IN=3.6V; 4LEDs IOUT =20mA (RFB=0) ) V SW= 0V/div,DC 2) V OUT , 00mV / div,AC 3) Inductor Current, 200mA / div,DC T= 0S / div Inductor=0H, COUT =4.7F Step Response Start-Up/Shutdown 2 2 3 3 V OUT = 2V , V IN=3.6V ) Load 2mA to 5mA to 2mA ,DC. 2) V OUT , 00mA / div,AC 3) Inductor Current 200mA / div,DC T= 20S /div V OUT =2V , V IN=2.7V ) EN , V/ div.DC 2) V OUT , 0/div,DC 3) Inductor Current 00mA/div,DC Load = 4LEDs, T=2ms/div FB Trip Point vs Temperature SUB Display .25 .24 Output Over Voltage Protection vs. Temp. 23.0 22.8 Output Over Voltage (V) Feedback Trip Point (V) 22.6 22.4 22.2 22.0 2.8 2.6 2.4 2.2 .23 .22 V IN =4.2V .2 .20 . -40 V IN =3.6V VIN=3.6V -20 0 20 40 60 80 85 -20 Temperature ( C) 0 20 40 o 60 80 85 2.0 -40 Temperature ( oC) Feb27-07 Rev K Integrated White LED Driver With Organic LED Display Power Supply (c) 2007 Sipex Corporation 0 PACkAgE: 10 PIN DFN Package Dimension DFN-10 (3mmx3mmx0.85mm) D SYMBOLS A D MILLIMETERS MIN 2.00 2.00 0.450 MAX 0.00 3.00 3.00 0.550 INCHES MIN 0.4 0.4 0.08 MAX 0.035 0.22 0.22 0.022 E E F e D2 E2 b L g 0.450 TYP. .600 TYP. 2.400 TYP. 0.50 0.350 0.00 0.000 0.250 0.450 0.00 0.050 0.07 TYP. 0.063 TYP. 0.04 TYP. 0.005 0.04 0.0004 0.000 0.00 0.08 0.004 0.002 TOP VIEW H D2 L H PIN 1 ID b e E2 BOTTOM VIEW G F SIDE VIEW A Feb27-07 Rev K Integrated White LED Driver With Organic LED Display Power Supply (c) 2007 Sipex Corporation ORDERINg INFORMATION Part Number Voltage Operating Temperature Range -40C to +85C Package Lead Free 0 Pin DFN Marking* Pack Quantity ,000/ Tape & Reel SP645ER-L/TR ADJ SP645ERYWWX *Note: "Y" = Year, "WW" = Product Work Week, "X" = st Alpha of Lot Number Solved by Sipex Corporation TM Headquarters and Sales Office 233 South Hillview Drive Milpitas, CA 5035 TEL: (408) 34-7500 FAX: (408) 35-7600 Sipex Corporation reserves the right to make changes to any products described herein. Sipex does not assume any liability arising out of the application or use of any product or circuit described herein; neither does it convey any license under its patent rights nor the rights of others. Feb27-07 Rev K Integrated White LED Driver With Organic LED Display Power Supply (c) 2007 Sipex Corporation 2 |
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