AME5136

AME, Inc. AME5136 n General Description The AME5136 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 SEL pin status, the AME5136 can either regulates output current flowing through series connected LEDs or regulate output voltage applying to 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 1uA. 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 AME5136 is available in a small DFN-10( 3mmx3mmx0.85mm) package. Integrated White LED Driver With Organic LED Display Power Supply n Typical Application V IN 2.7V~4.2V CIN 4.7µ F VIN OVP ILED1 CH1 VFB1 FB1 >1.5V 0V EN Main V SUB SEL GND FB2 RSUB2 CH2 47P RSUB1 OLED SUB Display AME5136 RFB1 ILED1= 0.21 R FB1 L 10µ H D Main Display COUT1 1 µF SW n Features l Integrated OLED and White-LED Driver l Wide Input Voltage Range: 2.7V to 5.5V l Adjustable output voltage up to 20V l Complete Protection: OVP, OTP, UVP l PWM Dimming Control l Small External Components l Cycle-By-Cycle Current Limit l All AME's Lead Free Products Meet RoHS Standards VIN 2.7V~4.2V C IN 4.7µF R  VSUB = 1 + SUB1  ×1.23 R   SUB 2  Figure 1. Main LEDs Display and OLED SUB Display L 10 µH D Main Display COUT1 1 µF SW VIN OVP ILED1 CH1 FB1 VFB1 0.21 RFB1 ILED1= R FB1 n Applications l l l l l White LED Back-Lighting Hand-held Devices Digital Cameras Flip-phones / Clam-shell Cellular Phones High-fashion cellular phones >1.5V 0V EN AME5136 CH2 VSUB C OUT2 1 µF Main VSUB ILED2 SEL GND FB2 VFB2 RFB2 ILED2= 1.23 RFB2 Figure 2. 4 LEDs for Main Panel and 3 LEDs for SUB Panel 1 AME, Inc. AME5136 n Function Block Diagram L V IN 1 VIN SW 10 OVP COMP OVP 9 C1 XEnable Vref Enable UVP COMP Integrated White LED Driver With Organic LED Display Power Supply D Main Display UVP REF CL 2 EN CIN Logic OTP Adjust 400ns one shut CL COMP Current sensing OVP REF 5 N2 CH1 FB1 Driver N1 P1 Driver 4 RFB1 3 SEL Select Logic ref1 CH2 8 ref2 FB2 7 6 GND Organic LED CP Figure 3. AME5136 Function Block Diagram 2 AME, Inc. AME5136 n Pin Configuration DFN-10 (3mmx3mmx0.85mm) Top View AME5136AEVB 10 9 8 7 6 Integrated White LED Driver With Organic LED Display Power Supply 1. VIN 2. EN 3. SEL 4. FB1 5. CH1 6. GND AME5136 1 2 3 4 5 7. FB2 8. CH2 9. OVP 10. SW * Die Attach: Conductive Epoxy Note : The area enclosed by dashed line represents Exposed Pad and connect to GND. n Pin Description Pin Number 1 2 Pin Name VIN EN Input Voltage. Pin Description Shutdown control input, active low. The shutdown pin is an active low control. Tie this pin above 1.5V 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 CH1. 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 N1. 3 3 4 5 6 7 8 9 10 SEL FB1 CH1 GND FB2 CH2 OVP SW   R VSUB =  1 + SUB1  × 1.23 R   SUB2  AME, Inc. AME5136 n Ordering Information AME5136 x x x x xxx x- x Special Feature2 Special Feature1 Output Voltage Number of Pins Package Type Operating Ambient Temperature Range Pin Configuration Integrated White LED Driver With Organic LED Display Power Supply Pin Configuration Operating Ambient Number Package Temperature of Output Voltage Type Range Pins E: -40OC to +85OC V: DFN B: 10 Special Feature1 Special Feature2 (For DFN package only) A (DFN-10) 1. VIN 2. EN 3. SEL 4. FB1 5. CH1 6. GND 7. FB2 8. CH2 9. OVP 10. SW ADJ: Adjustable Z: Lead free 3: 3x3x0.85(mm) (LxWxH) n Ordering Information Part Number AME5136AEVBADJZ-3 Marking* BDZ yyww Output Voltage ADJ Package DFN-10 (3mmx3mmx0.85mm) Operating Ambient Temperature Range -40oC to +85oC Note: ww represents the date code and pls refer to Date Code Rule page on Package Dimension. * A line on top of the first letter represents lead free plating such as BDZ. Please consult AME sales office or authorized Rep./Distributor for the availability of package type. 4 AME, Inc. AME5136 n Absolute Maximum Ratings Parameter Input Supply Voltage EN, FB Voltages SW Voltage ESD Classification Integrated White LED Driver With Organic LED Display Power Supply Symbol VIN VEN ,V FB 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 ~ 1999V n 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 Unit V o C -40 to +125 n Thermal Information Parameter Thermal Resistance (Junction to Ambient) Internal Power Dissipation Maximum Junction Temperature Solder Iron (10 Sec)** Package Die Attach Symbol θJA Maximum 48 Unit o C/W DFN-10 Conductive Epoxy (3x3x0.85)(mm) PD 2 150 350 W o C C o * MIL-STD-202G 210F 5 AME, Inc. AME5136 n Electrical Specifications VIN=3.6V, EN = VIN, TA= 25oC unless otherwise noted. Parameter Input Voltage Range Symbol V IN Test Condition TA = -40 C to +85 C FB = 0.3 (Not Switch) Main Display Quiescent Current IQ(Main) FB = 0.1 (Switching) FB = 1.3V (Not Switch) SUB Display Quiescent Current IQ(SUB) FB = 1.15V (Switching) Shutdown Current FB1 Feedback Voltage FB2 Feedback Voltage Switch Current Limit Main_Switch RDSON, N1 PMOS Switch RDSON , P1 NMOS Switch RDSON , N2 Switch off time Input Under Voltage Lockout Output Over Voltage Protection Over Temperature Protection Over Temperature Hysteresis Main Switch Leakage N1 PMOS Switch Leakage P1 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 6 o o o Integrated White LED Driver With Organic LED Display Power Supply Min 2.7 Typ Max 5.5 Units V TA = 25 C TA = -40 to 85 C TA = 25 C TA = -40 to 85oC TA = 25 C TA = -40 to 85 C TA = 25oC TA = -40 to 85oC o o o o 150 200 300 µA 150 250 400 150 200 300 µA 150 250 400 ISD V FB1 V FB2 ICL EN = 0V TA = -40 to 85 C TA = -40 to 85 C TA = 25oC TA = -40 to 85 C o o o o 0.05 0.2 1.2 300 280 0.6 0.21 1.23 350 2 0.23 µA V 1.26 400 mA 400 1.6 10 8 ns 2.3 V 23 o RDSON TA = -40 to 85 C 8 6 Ω t OFF UVP OVP OTP OTH TA = -40 to 85 C TA = -40 to 85oC o 400 1.7 21 2 22 160 20 0.1 2 1 1 0.4 TA = -40 to 85 C 1.5 0.3 o C ISW V SW = 5V 0.5 0.5 µA EN Threshold V SEL Threshold TA = -40 to 85 C 1.5 o V AME, Inc. AME5136 n Detailed Description The AME5136 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/10mA or 3 white LEDs. The AME5136 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 CH1 or CH2. Current Limit Protection The AME5136 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 AME5136 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 ~1V hysteresis associated with this circuitry, which will turn the NMOS off when the output voltage is at 23V(max.) until the output voltage reach 21V(typ.) or lower. The 22V limit allows the use of 25V 1µF ceramic output capacitors creating an overall small solution for white LED applications. Under Voltage Protection The AME5136 has an 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. Integrated White LED Driver With Organic LED Display Power Supply n Application Information Inductor Selection The recommended value of inductor for AME5136 applications is 10uH. Small size and better efficiency are the major concerns for portable device, such as AME5136 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 in put range is 2.7V to 5.5V. Capacitor Selection 4.7µF input capacitor can reduce input ripple. For better voltage stability, to increase the input capacitor value or using LC filter is feasible, especially in the Li-ion battery application. 1uF output capacitor is sufficient to reduce output voltage ripple. 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. Diode Selection Schottky diode is a good choice for AME5136 because of its lower forward voltage drop and faster reverse recovery. Using schottky diode can get better efficiency. The high speed rectification is also a good characteristic of schottky diode for high switching frequency. Current rating of the diode must meet the root mean square of the peak current and output average current multiplication. 7 AME, Inc. AME5136 Feedback Voltage vs. VIN (4LEDs) 0.25 0.23 Integrated White LED Driver With Organic LED Display Power Supply EN Threshold vs. VIN 1.5 1.4 1mA 0.21 10mA 1.3 EN Threshol d (V) 1.2 1.1 1.0 0.9 0.8 0.7 0.6 0.5 VFB (V) 0.19 0.17 0.15 0.13 0.11 2.7 20mA TA=-40o C TA=85 oC T A=25oC 3 3.3 3.6 3.9 4.2 4.5 4.8 5.1 5.5 0.4 2.5 3 3.5 4 4.5 5 5.5 VIN (V) VIN (V) Feedback Voltage vs. VIN (3LEDs) 0.27 0.27 Feedback Voltage vs. VIN (3LEDs) COUT= 4.7 µF 0.25 COUT = 1µF 0.25 10mA VF B ( V ) 0.23 1mA 20mA VF B ( V ) 0.23 0.21 0.21 1mA 20mA 30mA 0.19 0.19 10mA 30mA 0.17 2.7 3 3.3 3.6 3.9 4.2 4.5 4.8 5.1 5.5 0.17 2.7 3 3.3 3.6 3.9 4.2 4.5 4.8 5.1 5.5 VIN ( V ) VIN ( V ) Main Display Efficiency ( 4LEDs ) 90 90 Main Display Efficiency ( 4LEDs ) Inductor=22µH 85 Inductor=10µH 85 VIN=4.2V VIN=3.6V 80 Ef fi ci e ncy ( % ) VIN=3.6V 80 VIN=3V 75 75 70 VIN =3V VIN=4.2V 70 65 65 60 1 4 7 10 13 16 19 60 1 4 7 10 13 16 19 Load Current ( mA ) Load Current ( mA ) 8 AME, Inc. AME5136 Main Display Efficiency ( 3LEDs ) 90 85 Integrated White LED Driver With Organic LED Display Power Supply Main Display Efficiency ( 3LEDs ) Inductor=10µH VIN =3V 80 Inductor=22µH 85 Effici en cy (% ) Effici en cy (%) 80 VIN=3.6V VIN=3V 75 VIN=4.2V 75 VIN=4.2V 70 70 65 65 VIN=3.6V 60 1 4 7 10 13 16 19 60 1 4 7 10 13 16 19 Load Current (mA) Load Current ( mA ) Sub Display Efficiency( VSUB=12V) 85 90 Sub Display Efficiency (V SUB=12V) VIN=5.0V VIN =4.2V 80 75 70 65 60 55 50 1 4 7 10 13 VIN=3.6V 85 VIN=3.6V Effi ci en cy (%) Eff ic ienc y (%) VIN=3.3V VIN=2.5V 80 VIN=2.5V 75 VIN=3.3V 70 VIN=4.2V 65 Inductor=10µH 16 19 60 1 4 7 10 Inductor=22µH 13 16 19 Load Current (mA ) Load Current (mA ) Sub Display Efficiency( VSUB=20V) 90 85 Sub Display Efficiency( VSUB=20V ) 85 VIN=4.2V VIN=5.0V VIN=3.6V VIN=4.2V 80 80 75 70 65 60 55 50 Effic ie nc y (% ) Effic ie nc y (% ) VIN=3.3V V IN=3.3V 75 70 V IN=3.6V VIN=2.5V V IN=2.5V 65 60 55 Inductor=22µ H 1 4 Inductor=10µH 50 1 4 7 10 13 16 19 Load Current (mA) 7 10 13 16 19 Load Current (mA ) 9 AME, Inc. AME5136 Sub Enable Current vs. VIN (Part not Switching) 300 Integrated White LED Driver With Organic LED Display Power Supply Main Enable Current vs. VIN (Part Switching) 300 TA=85 oC 250 TA=85 oC En able Curren t (µA) En ab le C urren t (µA ) 250 200 200 T A=-40oC 150 TA=-40 oC 150 100 100 TA=25 oC 50 TA=25 oC 50 0 2.5 3 3.5 4 4.5 5 5.5 0 2.5 3 3.5 4 4.5 5 5.5 VIN (V) VIN (V) Main Disable Current vs. VIN (Part Switching) 300 Sub Disable Current vs. VIN (Part not Switching) 300 T A=85oC TA=85 oC Di sabl e C urrent (µA ) Di sabl e Cu rrent (µA ) 250 250 200 200 TA=-40 C 150 o TA=-40 oC 150 100 100 T A=25 C 50 o T A=25oC 50 0 2.5 3 3.5 4 4.5 5 5.5 0 2.5 3 3.5 4 4.5 5 5.5 VIN ( V ) VIN ( V) Switch RDSON vs. VIN 1.6 1.5 1.4 1.3 Input Under Voltage Lockout vs. Temp. 2.3 Tu rn On / Tu rn Off (V) 2.2 Main Display 4LEDs ILED=20mA VOUT=12V RDS ON (Ω) 1.2 1.1 1.0 0.9 0.8 0.7 0.6 0.5 2.5 3 3.5 4 4.5 5 5.5 2.1 2.0 TA=85 oC TA=-40o C TA=25 oC 1.9 TON 1.8 TOFF 1.7 -40 -20 0 20 40 60 80 100 VIN (V) Temperature (oC) 10 AME, Inc. AME5136 Typical Switching Waveform Integrated White LED Driver With Organic LED Display Power Supply Typical Switching Waveform 1 1 2 2 3 3 V OUT =12V, V IN=2.5V; 4LEDs IOUT =10mA (RFB1=20 Ω ) 1) V SW= 20V/div,DC 2) V OUT , 100mV / div,AC 3) Inductor Current, 200mA / div,DC T= 10µS / div Inductor=10µH, COUT =4.7µF V OUT =12V, V IN=3.6V; 4LEDs IOUT =20mA (RFB1=10Ω ) 1) V SW= 10V/div,DC 2) V OUT , 100mV / div,AC 3) Inductor Current, 200mA / div,DC T= 10µS / div Inductor=10µH, COUT =4.7µF Step Response Start-Up/Shutdown 1 1 2 2 3 3 V OUT = 12V , V IN=3.6V 1) Load 2mA to 15mA to 2mA ,DC. 2) V OUT , 100mA / div,AC 3) Inductor Current 200mA / div,DC T= 20µS /div V OUT =12V , V IN=2.7V 1) EN , 1V/ div.DC 2) V OUT , 10/div,DC 3) Inductor Current 100mA/div,DC Load = 4LEDs, T=2ms/div 11 AME, Inc. AME5136 FB Trip Point vs Temperature SUB Display 1.259 23.0 22.8 Integrated White LED Driver With Organic LED Display Power Supply Output Over Voltage Protection vs. Temp. 1.249 O utpu t Over Voltage (V) Feedback Trip Poin t (V) 22.6 22.4 22.2 22.0 21.8 21.6 21.4 21.2 21.0 -40 -20 0 20 40 60 80 85 1.239 1.229 1.219 V IN =4.2V 1.209 V IN =3.6V VIN=3.6V 1.199 -40 -20 0 20 Temperature ( C) 40 o 60 80 85 Temperature ( oC) 12 AME, Inc. AME5136 n Date Code Rule Marking A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A Date Code W W W W W W W W W W W W W W W W W W W W Year xxx0 xxx1 xxx2 xxx3 xxx4 xxx5 xxx6 xxx7 xxx8 xxx9 Integrated White LED Driver With Organic LED Display Power Supply n Tape and Reel Dimension DFN-10 (3mmx3mmx0.85mm) P W AME AME PIN 1 Carrier Tape, Number of Components Per Reel and Reel Size Package DFN-10 (3mmx3mmx0.85mm) Carrier Width (W) 8.0±0.1 mm Pitch (P) 4.0±0.1 mm Part Per Full Reel 1000pcs Reel Size 180±1 mm 13 AME, Inc. AME5136 n Package Dimension DFN-10 (3mmx3mmx0.85mm) Integrated White LED Driver With Organic LED Display Power Supply D SYMBOLS A D MILLIMETERS MIN 2.900 2.900 0.450 MAX 0.900 3.100 3.100 0.550 INCHES MIN 0.114 0.114 0.018 MAX 0.035 0.122 0.122 0.022 E E F e D2 E2 b L G 0.450 TYP. 1.600 TYP. 2.400 TYP. 0.150 0.350 0.010 0.000 0.250 0.450 0.090 0.050 0.017 TYP. 0.063 TYP. 0.094 TYP. 0.0059 0.014 0.0004 0.000 0.010 0.018 0.004 0.002 TOP VIEW H D2 L H PIN 1 ID b e E2 BOTTOM VIEW G F SIDE VIEW A 14 www.ame.com.tw E-Mail: sales@ame.com.tw Life Support Policy: These products of AME, Inc. are not authorized for use as critical components in life-support devices or systems, without the express written approval of the president of AME, Inc. AME, Inc. reserves the right to make changes in the circuitry and specifications of its devices and advises its customers to obtain the latest version of relevant information. © AME, Inc. , Julu 2006 Document: 1011-DS5136-A.01 Corporate Headquarter AME, Inc. 2F, 302 Rui-Guang Road, Nei-Hu District Taipei 114, Taiwan. Tel: 886 2 2627-8687 Fax: 886 2 2659-2989 U.S.A. (Subsidiary) Analog Microelectronics, Inc. 3100 De La Cruz Blvd., Suite 201 Santa Clara, CA. 95054-2046 Tel : (408) 988-2388 Fax: (408) 988-2489