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| AME, Inc. AME5131 n General Description The AME5131 is a high-frequency boost converter dedicated for LCD bias supply and white LED applications for cellular phone backlighting, PDAs, and other hand-held devices. The part can also be used to generate standard 3.3 V/5 V to 12 V power conversions. The AME5131 has an internal 400mA switch current limit, offering lower output voltage ripple. The 32A low quiescent current together with an optimized control scheme, allows device operation at high efficiencies and maintains long battery lifetime. AME5131 uses SOT-25 package and gives a small size solution. Low Power DC/DC Boost Converter n Function Block Diagram On / Off Time Controller UVP VIN SW _ FB + Boost Controller Driver Bandgap + _ GND Soft Start Enable EN n Features l 0.6 Internal Switch l 1.8V to 5.5V Input Range l Adjustable Output Voltage Up to 28V l Input Under Voltage Protection l 32A Typical No Load Quiescent Current l 1A Shutdown Current l SOT-25 Package l All AME's Lead Free Products Meet RoHS Standards CIN 4.7gF 4 EN VIN 1.8 V-5.5 V 5V IN 1 R1 2.1M CFF 22PF n Typical Application L1 10gH D1 VOUT VIN ~28 V SW AME5131 FB GND 3 2 R2 150K CO 1gF n Applications l White LED Back-Lighting l Hand-held Devices l Digital Cameras l Portable Applications l Internet Audio Player l LCD Bias Power l Standard 3.3 V/5 V to 12 V Conversions 1 AME, Inc. AME5131 n Pin Configuration SOT-25 Top View 5 4 Low Power DC/DC Boost Converter AME5131AEEV 1. SW 2. GND AME5131 3. FB 4. EN 5. VIN * Die Attach: Conductive Epoxy 1 2 3 n Pin Description Pin Number 1 2 3 4 5 Pin Name SW GND FB EN VIN Pin Description This is the switch pin and is connected to the drain of the internal NMOS power switch. Minimize the metal trace area connected to this pin to minimize EMI. Ground Pin. Feedback Input Pin. Connect this pin to the external voltage divider to program the desired output voltage. Enable Control Input Pin. (Active High) Input Supply Pin. Place bypass capacitor as close to VIN as possible. 2 AME, Inc. AME5131 n Ordering Information AME5131 x x x x xxx x Special Feature Output Voltage Number of Pins Package Type Operating Ambient Temperature Range Pin Configuration Low Power DC/DC Boost Converter Pin Configuration A (SOT-25) Operating Ambient Package Type Temperature Range E: -40OC to +85OC E: SOT-2X Number of Pins V: 5 Output Voltage Special Feature 1. SW 2. GND 3. FB 4. EN 5. VIN ADJ: Adjustable Z: Lead free n Ordering Information Part Number AME5131AEEVADJZ Marking* BEFww Output Voltage ADJ Package SOT-25 Operating Ambient Temperture 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 BEFww. Please consult AME sales office or authorized Rep./Distributor for the availability of package type. 3 AME, Inc. AME5131 n Absolute Maximum Ratings Parameter Input Supply Voltage EN, FB Voltages SW Voltage ESD Classification Low Power DC/DC Boost Converter Symbol VIN VEN, VFB VSW Maximum 6 VIN 30 C* Unit V Caution: Stree above the listed absolute maximum rating may cause permanent damage to the device. HBM C: 4000V+ n Recommended Operating Conditions Parameter Ambient Temperature Range Junction Temperature Range Symbol TA TJ Rating -40 to +85 -40 to +125 Unit O C n Thermal Information Parameter Thermal Resistance* (Junction to Case) Thermal Resistance (Junction to Ambient) Internal Power Dissipation Maximum Junction Temperature Solder Iron (10 Sec)** SOT-25 Conductive Epoxy Package Die Attach Symbol JC JA PD Maximum 81 Unit o C/W 260 o C/W mW o 400 150 350 C C o * Measure JC on center of molding compound if IC has no tab. ** MIL-STD-202G210F 4 AME, Inc. AME5131 n Electrical Specifications VIN = 2.4V, EN = VIN, TA = -40oC to 85oC, typical values are at TA = 25oC Parameter Input Voltage Quiescent Current Shutdown Current FB Pin Bias Current Feedback Trip Point UVP Voltage Switch Current Limit Switch RDSON SW leakage current Switch Off Time Switch On Time EN Input Current EN Input Threshold (High) EN Input Threshold (Low) Line Regulation Load Regulation Symbol VIN IQ ISD IFB VFB UVP ICL RDSON ISW t OFF t ON IEN VEH VEL REGLINE REGLOAD EN = GND or VIN Device Active Device Shutdown 1.8OVIN O 5.5V; VOUT =18V; ILOAD =10mA; Cff = not connected VIN =2.4V; VOUT =18V; 0mAOIOUTO30mA 0.3 0.15 1.3 0.4 VOUT = 18V, IOUT = 10mA, TA=25oC VIN = 2.4V; ISW = 200mA VSW = 28V 350 IOUT = 0mA, not switching, VFB = 1.3V EN = GND VFB = 1.3V 1.8V O VIN O 5.5V 1.187 Test Condition Min 1.8 32 0.1 Typ Max 5.5 50 1 1 1.212 1.237 1.5 400 0.6 1 400 6 0.1 1 1.7 450 1 10 V V mA A ns s A V V %/V %/mA A Units V Low Power DC/DC Boost Converter 5 AME, Inc. AME5131 n Detailed Description Operation The AME5131 is a boost converter with a smart control scheme that operates in a pulse frequency modulation (PFM) with constant peak current control. The smart control schemes utilize a reference voltage, minimum off-time, maximum on-time and current-limited control scheme. The switch turns off as the inductor current reaches the internally set peak current of 400mA (typical). The second criteria that turns off the switch is the maximum on-time of 6s (typical). As the switch is turned off the external Schottky diode is forward biased delivering the current to the output. The switch remains off for a minimum of 400 ns (typical), or until the feedback voltage drops below the reference voltage. Using this PFM peak current control scheme the converter operates in discontinuous conduction mode (DCM) where the switching frequency depends on the output current, which results in high efficiency over the entire load current range. This regulation scheme is inherently stable, allowing a wider selection range for the inductor and output capacitor. Soft-start Soft-start is provided on the AME5131 to minimize inrush current. All inductive boost converters exhibit high inrush current during start-up if no special precaution is made. This can cause voltage drops at the input rail during start up and may result in an unwanted or early system shut down. The soft-start time is set by increasing the current limit in two steps starting from 100mA for 256 cycles to 200mA for the next 256 cycles, and then full current limit. Low Power DC/DC Boost Converter 6 AME, Inc. AME5131 Efficiency vs Output Current 100 90 80 VIN =5.0V V IN =3.6V 90 Io=5mA 80 Io=10mA 70 Low Power DC/DC Boost Converter Efficiency vs Input Voltage Efficiency(%) 70 60 50 40 30 20 10 0 0 V IN =2.4V Efficiency (%) 100 60 50 40 30 20 10 0 1.8 1 10 2 2.5 3 3.5 4 4.5 5 5.5 6 Output Current (mA) Input Voltage (V) VOUT vs IOUT 19 18 17 16 20 VOUT vs VIN I OUT=10mA 19 V IN =2.4V VOUT (V) 15 14 13 12 11 10 0.1 VO UT (V) 1 10 100 18 17 IOUT (mA) 16 1.8 2 2.5 3 3.5 4 4.5 5 5.5 6 VIN (V) Quiescent Current vs Input Voltage 60 1.240 1.235 Feedback Voltage vs Temperature Quiescent Current (A) 50 Feedback Voltage (V) TA =85 C o 1.230 1.225 1.220 1.215 1.210 1.205 1.200 1.195 1.190 1.185 40 TA =25oC 30 TA =-40oC 20 10 1.2 1.8 2.4 3 3.6 4.2 4.8 5.4 6 6.6 1.180 -40 -20 0 20 40 60 80 100 120 Input Voltage (V) Temperature (oC) 7 AME, Inc. AME5131 RDSON vs Temperture 1200 Low Power DC/DC Boost Converter RDSON vs Input Voltage 1000 900 1000 800 700 RDSON (m) RDSON (m) 800 600 500 400 300 200 100 600 400 200 0 -20 -10 0 10 20 30 40 Temperature ( C) 50 o 60 70 80 90 0 1.8 2.4 3 3.6 4.2 4.8 5.4 6 Input Voltage (V) Load Transient Response Line Transient Response VIN 3.4V 2.4V VOUT 100mV/div VOUT 10mA 100mV/div IOUT 200S/div 1mA 200S/div Start Up Behavior 5V/div 1V/div VOUT EN 50mA/div I IN Time 8 AME, Inc. AME5131 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 Low Power DC/DC Boost Converter n Tape and Reel Dimension SOT-25 P W AME PIN 1 AME Carrier Tape, Number of Components Per Reel and Reel Size Package SOT-25 Carrier Width (W) 8.00.1 mm Pitch (P) 4.00.1 mm Part Per Full Reel 3000pcs Reel Size 1801 mm 9 AME, Inc. AME5131 n Package Dimension SOT-25 Top View D L Side View Low Power DC/DC Boost Converter SYMBOLS A A1 b D E e H L 1 A MILLIMETERS MIN MAX INCHES MIN MAX 1.20REF 0.00 0.30 2.70 1.40 0.15 0.55 3.10 1.80 0.0472REF 0.0000 0.0118 0.1063 0.0551 0.0059 0.0217 0.1220 0.0709 H E S1 e c1 1.90 BSC 2.60 3.00 0.07480 BSC 0.10236 0.11811 0.0146BSC o 0.37BSC 0 o Front View 10 0 o 10 o S1 0.95BSC 0.0374BSC b 10 A1 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. (c) AME, Inc. , July 2006 Document: 1115-DS5131-A.01 Corporate Headquarter AME, Inc. 2F, 302 Rui-Guang Road, Nei-Hu District Taipei 114, Taiwan, R.O.C. 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 |
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