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. Integrated White LED Driver With Organic LED Display Power Supply n Typical Application V IN 2.7V~4.2V L 10µH CIN 4.7µF Main Display COUT1 1µF SW VIN OVP 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 ILED1 CH1 VFB1 ILED1= FB1 >1.5V 0.21 R FB1 RFB1 AME5136 0V EN CH2 47P RSUB1 Main V SUB and OTP. OLED SUB Display FB2 SEL RSUB2 GND The AME5136 is available in a small DFN-10( 3mmx3mmx0.85mm) package. R VSUB = 1 + SUB1 ×1.23 RSUB 2 n Features l Integrated OLED and White-LED Driver l Wide Input Voltage Range: 2.7V to 5.5V D Figure 1. Main LEDs Display and OLED SUB Display l Adjustable output voltage up to 20V l Complete Protection: OVP, OTP, UVP l PWM Dimming Control l Small External Components VIN 2.7V~4.2V L 10µH C IN 4.7µF D Main Display COUT1 1µF SW VIN l Cycle-By-Cycle Current Limit l All AME's Lead Free Products Meet RoHS OVP Standards ILED1 CH1 FB1 n Applications l White LED Back-Lighting l Hand-held Devices l Digital Cameras l Flip-phones / Clam-shell Cellular Phones l High-fashion cellular phones >1.5V 0V ILED1= 0.21 RFB1 R FB1 AME5136 EN VFB1 VSUB CH2 C OUT2 1µF Main VSUB ILED2 SEL FB2 GND VFB2 RFB2 ILED2= 1.23 RFB2 Figure 2. 4 LEDs for Main Panel and 3 LEDs for SUB Panel 1 AME, Inc. Integrated White LED Driver With Organic LED Display Power Supply AME5136 n Function Block Diagram L D Main Display V IN 1 SW 10 VIN OVP 9 C1 OVP COMP XEnable Vref Enable UVP COMP UVP REF 2 OTP OVP REF CL COMP CL 400ns Adjust one shut 5 Current sensing N2 CH1 EN FB1 CIN Logic 4 Driver RFB1 N1 3 P1 Select Logic Driver ref1 SEL CH2 8 ref2 CP FB2 7 6 GND Figure 3. AME5136 Function Block Diagram 2 Organic LED AME, Inc. Integrated White LED Driver With Organic LED Display Power Supply AME5136 n Pin Configuration DFN-10 (3mmx3mmx0.85mm) Top View AME5136AEVB 10 9 8 7 6 1. VIN 2. EN 3. SEL 4. FB1 AME5136 5. CH1 6. GND 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 Pin Name Pin Description 1 VIN Input Voltage. 2 EN 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. 3 SEL Selection Pin. Internal MOSFET selection. Pull low to turn on the internal CH1. Pull high to turn on CH2. 4 FB1 Main Display Feedback. 5 CH1 Main Display Return Voltage 6 GND Ground. 7 FB2 SUB Display Feedback. 8 CH2 SUB Display Power Supply Voltage. 9 OVP Over Voltage Protection. 10 SW This is the switch pin and is connected to the drain of the internal NMOS power switch N1. R VSUB = 1 + SUB1 × 1.23 R SUB2 3 AME, Inc. Integrated White LED Driver With Organic LED Display Power Supply 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 Pin Configuration A (DFN-10) 1. VIN 2. EN 3. SEL 4. FB1 5. CH1 6. GND 7. FB2 8. CH2 9. OVP 10. SW Operating Ambient Number Package Temperature of Output Voltage Type Range Pins E: -40OC to +85OC V: DFN B: 10 Special Feature1 ADJ: Adjustable Z: Lead free Special Feature2 (For DFN package only) 3: 3x3x0.85(mm) (LxWxH) n Ordering Information Part Number Marking* Output Voltage Package Operating Ambient Temperature Range AME5136AEVBADJZ-3 BDZ yyww ADJ DFN-10 (3mmx3mmx0.85mm) -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. Integrated White LED Driver With Organic LED Display Power Supply AME5136 n Absolute Maximum Ratings Parameter Symbol Maximum VIN 6 VEN ,V FB VIN VSW 30 Input Supply Voltage EN, FB Voltages SW Voltage Unit V A* ESD Classification Caution: Stress above the listed absolute rating may cause permanent damage to the device. * HBM A: 0V ~ 1999V n Recommended Operating Conditions Parameter Symbol Rating Unit Input Supply Voltage VIN 2.7 to 5.5 V Ambient Temperature Range TA -40 to +85 o C Junction Temperature Range TJ -40 to +125 n Thermal Information Parameter Thermal Resistance (Junction to Ambient) Package Die Attach Symbol Maximum θJA 48 PD 2 Unit o C/W DFN-10 Conductive Epoxy (3x3x0.85)(mm) Internal Power Dissipation W Maximum Junction Temperature 150 o C Solder Iron (10 Sec)** 350 o C * MIL-STD-202G 210F 5 AME, Inc. Integrated White LED Driver With Organic LED Display Power Supply AME5136 n Electrical Specifications VIN=3.6V, EN = VIN, TA= 25oC unless otherwise noted. Parameter Input Voltage Range Symbol V IN Test Condition o TA = -40 C to +85 C FB = 0.3 (Not Switch) Main Display Quiescent Current IQ(Main) Shutdown Current FB1 Feedback Voltage FB2 Feedback Voltage Switch Current Limit ISD V FB1 V FB2 ICL TA = 25 C 150 o TA = -40 to 85 C 150 TA = -40 to 85oC FB = 1.15V (Switching) TA = 25oC 150 o TA = -40 to 85 C RDSON 150 TA = -40 to 85oC EN = 0V 200 200 250 2 0.2 0.21 0.23 TA = -40 to 85 C 1.2 1.23 1.26 TA = 25oC 300 350 400 o TA = -40 to 85 C o TA = -40 to 85 C TA = -40 to 85 C t OFF 400 0.6 1.6 8 10 6 8 400 TA = -40 to 85 C 1.7 2 2.3 Output Over Voltage Protection OVP TA = -40 to 85oC 21 22 23 Over Temperature Protection OTP 160 Over Temperature Hysteresis OTH 20 V V SW = 5V 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 EN Threshold Ω ns UVP ISW µA mA 280 Input Under Voltage Lockout PMOS Switch Leakage P1 µA V o o µA 250 0.05 o Main Switch Leakage N1 6 V 400 NMOS Switch RDSON , N2 Switch off time 5.5 300 Main_Switch RDSON, N1 PMOS Switch RDSON , P1 Units 400 o TA = 25 C Max 300 TA = 25 C FB = 1.3V (Not Switch) IQ(SUB) Typ 2.7 o o FB = 0.1 (Switching) SUB Display Quiescent Current Min o o 0.1 2 0.5 1 0.5 1 C µA 0.4 o TA = -40 to 85 C V 1.5 0.3 SEL Threshold o TA = -40 to 85 C V 1.5 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. 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. 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. 7 AME, Inc. Integrated White LED Driver With Organic LED Display Power Supply AME5136 EN Threshold vs. VIN Feedback Voltage vs. VIN (4LEDs) 1.5 0.25 1.4 0.23 10mA 1.3 EN Threshold (V) 1mA VFB (V) 0.21 20mA 0.19 0.17 0.15 1.2 TA=-40o C 1.1 1.0 0.9 TA=85 oC 0.8 0.7 T A=25oC 0.6 0.13 0.5 0.11 2.7 3 3.3 3.6 3.9 4.2 4.5 4.8 5.1 0.4 2.5 5.5 3 3.5 4 4.5 5 5.5 VIN (V) VIN (V) Feedback Voltage vs. VIN (3LEDs) Feedback Voltage vs. VIN (3LEDs) 0.27 0.27 COUT= 4.7µF COUT = 1µF 0.25 0.25 VFB ( V ) VFB ( V ) 10mA 0.23 1mA 20mA 0.21 30mA 0.23 0.21 0.19 0.19 0.17 2.7 0.17 2.7 1mA 20mA 10mA 30mA 3 3.3 3.6 3.9 4.2 4.5 4.8 5.1 5.5 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 ) Main Display Efficiency ( 4LEDs ) 90 90 Inductor=10µH Inductor=22µH VIN=4.2V 85 85 80 VIN=3.6V 75 VIN =3V 70 80 VIN=3V 75 VIN=4.2V 70 65 65 60 1 4 7 10 13 Load Current ( mA ) 8 Efficiency (%) VIN=3.6V 16 19 60 1 4 7 10 13 Load Current ( mA ) 16 19 AME, Inc. Integrated White LED Driver With Organic LED Display Power Supply AME5136 Main Display Efficiency ( 3LEDs ) Main Display Efficiency ( 3LEDs ) 90 85 Inductor=22µH Inductor=10µH VIN =3V 80 VIN=3.6V 75 VIN=4.2V 70 80 Efficiency (%) Efficiency (%) 85 VIN=3V 75 VIN=4.2V 70 VIN=3.6V 65 65 60 60 1 4 7 10 13 16 19 1 7 4 Sub Display Efficiency( VSUB=12V) 16 19 90 VIN=3.6V VIN =4.2V 80 85 75 Efficiency (%) VIN=3.3V VIN=2.5V 70 65 60 VIN=5.0V VIN=3.6V 80 VIN=3.3V VIN=2.5V 75 VIN=4.2V 70 65 55 Inductor=10µH Inductor=22µH 50 1 4 7 10 13 16 60 19 1 4 7 Load Current (mA ) 10 13 16 19 Load Current (mA ) Sub Display Efficiency( VSUB=20V) Sub Display Efficiency( VSUB=20V ) 85 90 VIN=4.2V VIN=4.2V 85 VIN=5.0V 80 80 75 VIN=2.5V 70 V IN=3.3V VIN=3.6V VIN=3.3V Efficiency (%) Efficiency (%) 13 Sub Display Efficiency (V SUB=12V) 85 Efficiency (%) 10 Load Current ( mA ) Load Current (mA) 65 75 V IN=3.6V 70 V IN=2.5V 65 60 60 55 50 Inductor=22µH 55 Inductor=10µH 50 1 4 7 10 13 Load Current (mA) 16 19 1 4 7 10 13 16 19 Load Current (mA ) 9 AME, Inc. Integrated White LED Driver With Organic LED Display Power Supply AME5136 Sub Enable Current vs. VIN (Part not Switching) Main Enable Current vs. VIN (Part Switching) 300 300 TA=85 oC TA=85 oC Enable Current (µA) Enable Current (µA) 250 200 T A=-40oC 150 100 TA=25 oC 250 200 TA=-40 oC 150 100 0 2.5 TA=25 oC 50 50 3 3.5 4 4.5 5 0 2.5 5.5 3 3.5 VIN (V) 4 4.5 5 Sub Disable Current vs. VIN (Part not Switching) Main Disable Current vs. VIN (Part Switching) 300 300 TA=85 oC 250 Disable Current (µA ) Disable Current (µA) T A=85oC 200 o TA=-40 C 150 100 o T A=25 C 50 0 2.5 250 200 TA=-40 oC 150 100 T A=25oC 50 3 3.5 4 4.5 5 0 2.5 5.5 3 3.5 4 Switch RDSON vs. VIN 5 2.3 Main Display 4LEDs ILED=20mA VOUT=12V Turn On / Turn Off (V) 1.5 1.4 1.3 1.2 1.1 1.0 TA=85 oC 0.8 TA=-40o C TA=25 oC 0.7 2.2 2.1 2.0 1.9 TON 1.8 0.6 0.5 2.5 TOFF 3 3.5 4 VIN (V) 10 5.5 Input Under Voltage Lockout vs. Temp. 1.6 RDSON (Ω) 4.5 VIN (V) VIN ( V ) 0.9 5.5 VIN (V) 4.5 5 5.5 1.7 -40 -20 0 20 40 60 Temperature (oC) 80 100 AME, Inc. Integrated White LED Driver With Organic LED Display Power Supply AME5136 Typical Switching Waveform 1 Typical Switching Waveform 1 2 2 3 3 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 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 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. Integrated White LED Driver With Organic LED Display Power Supply AME5136 FB Trip Point vs Temperature SUB Display Output Over Voltage Protection vs. Temp. 23.0 1.259 1.249 1.239 1.229 V IN =4.2V 1.219 1.209 1.199 -40 V IN =3.6V -20 22.6 22.4 22.2 22.0 21.8 21.6 21.4 VIN=3.6V 21.2 0 20 40 o Temperature ( C) 12 Output Over Voltage (V) Feedback Trip Point (V) 22.8 60 80 85 21.0 -40 -20 0 20 40 Temperature ( oC) 60 80 85 AME, Inc. Integrated White LED Driver With Organic LED Display Power Supply AME5136 n Date Code Rule Marking Date Code Year A A A W W xxx0 A A A W W xxx1 A A A W W xxx2 A A A W W xxx3 A A A W W xxx4 A A A W W xxx5 A A A W W xxx6 A A A W W xxx7 A A A W W xxx8 A A A W W xxx9 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 Carrier Width (W) Pitch (P) Part Per Full Reel Reel Size DFN-10 (3mmx3mmx0.85mm) 8.0±0.1 mm 4.0±0.1 mm 1000pcs 180±1 mm 13 AME, Inc. Integrated White LED Driver With Organic LED Display Power Supply AME5136 n Package Dimension DFN-10 (3mmx3mmx0.85mm) D SYMBOLS MILLIMETERS MIN A E D2 L b PIN 1 ID E2 e BOTTOM VIEW A G F SIDE VIEW 14 0.900 MAX 0.035 2.900 3.100 0.114 0.122 E 2.900 3.100 0.114 0.122 e H MIN D F TOP VIEW MAX INCHES 0.450 TYP. 0.450 0.550 0.017 TYP. 0.018 0.022 D2 1.600 TYP. 0.063 TYP. E2 2.400 TYP. 0.094 TYP. b 0.150 0.250 0.0059 0.010 L 0.350 0.450 0.014 0.018 G 0.010 0.090 0.0004 0.004 H 0.000 0.050 0.000 0.002 www.ame.com.tw E-Mail: [email protected] 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 U.S.A. (Subsidiary) AME, Inc. Analog Microelectronics, Inc. 2F, 302 Rui-Guang Road, Nei-Hu District Taipei 114, Taiwan. Tel: 886 2 2627-8687 Fax: 886 2 2659-2989 3100 De La Cruz Blvd., Suite 201 Santa Clara, CA. 95054-2046 Tel : (408) 988-2388 Fax: (408) 988-2489