AME5142 AME | Alldatasheet
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AME, Inc. AME5142 White LED Boost Converter In Tiny Package Rev. A.01 AME5142AEEV 1. SW 2. GND 3. FB 4. EN 5. IN * Die Attach: Conductive Epoxy SOT-25/TSOT-25 Top View n Pin Configuration n Pin Description AME5142AEEY 1. SW 2. GND 3. FB 4. EN 5. OVP 6. IN * Die Attach: Conductive Epoxy SOT-26/TSOT-26 Top View 1 32 5 4 AME5142 Pin Number Pin Name Pin Description 1 SW Power Switch input. This is the drain of the internal NMOS power switch. Minimize the metal trace area connected to this pin to minimize EMI. 2 GND Ground. Tie directly to ground plane. 3 FB Output voltage feedback input. Connect the ground of the feedback network to an AGND (Analog Ground) plane which should be tied directly to the GND pin. 4 EN Enable control input, active high. The enable pin is an active high control. Tie this pin above 1.5V to enable the device. Tie this pin below 0.4V to turn off the device. 5 IN Analog and Power input. Input Supply Pin. Bypass this pin with a capacitor as close to the device as possible. AME5142AEEV 1 32 6 45 AME5142
AME, Inc. White LED Boost Converter In Tiny PackageAME5142 Rev. A.01 n Pin Description Pin Number Pin Name Pin Description 1 SW Power Switch input. This is the drain of the internal NMOS power switch. Minimize the metal trace area connected to this pin to minimize EMI. 2 GND Ground. Tie directly to ground plane. 3 FB Output voltage feedback input. Connect the ground of the feedback network to an AGND(Analog Ground) plane which should be tied directly to the GND pin. 4 EN Enable control input, active high. The enable pin is an active high control. Tie this pin above 1.5V to enable the device. Tie this pin below 0.4V to turn off the device. 5 OVP Over Voltage Protection. 6 IN Analog and Power input. Input Supply Pin. Bypass this pin with a capacitor as close to the device as possible. AME5142AEEY
AME, Inc. AME5142 White LED Boost Converter In Tiny Package Rev. A.01 A 1. SW E: -40OC to 85OC E: SOT-2X V: 5 ADJ: Adjustable Y: (SOT-25) 2. GND Y: 6 (TSOT-25) 3. FB Z: Lead free 4. EN 5. IN A 1. SW (SOT-26) 2. GND (TSOT-26) 3. FB 4. EN 5. OVP 6. IN Output Voltage Special FeaturePin Configuration Operating Ambient Temperature Range Package Type Number of Pins Lead free & Low profile n Ordering Information 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 BJGww. Please consult AME sales office or authorized Rep./Distributor for the availability of package type. Operating Ambient Temperature Range Number of Pins Package Type Pin Configuration Special Feature AME5142 x x x x xxx x Output Voltage n Ordering Information Part Number Marking* Output Voltage Package Operating Ambient Temperature Range AME5142AEEYADJZ BJGww ADJ SOT-26 -40OC to 85OC AME5142AEEYADJY BJGww ADJ TSOT-26 -40OC to 85OC AME5142AEEVADJZ BJHww ADJ SOT-25 -40OC to 85OC AME5142AEEVADJY BJHww ADJ TSOT-25 -40OC to 85OC
AME, Inc. White LED Boost Converter In Tiny PackageAME5142 Rev. A.01 Parameter Package Die Attach Symbol Maximum Unit Thermal Resistance* (Junction to Case) θ JC 81 Thermal Resistance (Junction to Ambient) θ JA 260 Internal Power Dissipation PD 400 mW 350 oC oC / W Solder Iron (10Sec)** SOT-25 TSOT-25 SOT-26 TSOT-26 Conductive Epoxy Parameter Symbol Rating Unit Ambient Temperature Range TA -40 to 85 Junction Temperature Range TJ -40 to 125 Storage Temperature Range TSTG -65 to 150 oC n Absolute Maximum Ratings n Recommended Operating Conditions n Thermal Information * Measure θ JC on center of molding compound if IC has no tab. ** MIL-STD-202G 210F Parameter Symbol Maximum Unit Input Supply Voltage VIN 6 V EN, FB Voltages VEN,VFB VIN V SW, OVP Voltage VSW,VOVP 30 V ESD Classification B* Caution: Stress above the listed in absolute maximum ratings may cause permanent damage to the device. * HBM B: 2000V ~ 3999V
AME, Inc. AME5142 White LED Boost Converter In Tiny Package Rev. A.01 n Electrical Specifications VIN = 4.2V, EN = VIN, TA = 25oC, Unless otherwise noted. Parameter Symbol Min Typ Max Units Input Voltage VIN 2.7 5.5 V 0.85 1 mA 180 250 µA Feedback Trip Point VFB 0.137 0.15 0.163 V FB Pin Bias Current IFB 0.1 1 µA Switch Current Limit ICL 650 850 1000 mA Switch On-Resistance RDSON 0.7 1.4 Ω SW Leakage Current ISW 1 10 µA Swich frequency fSW 0.9 1.2 1.5 MHz Maximum Duty Cycle Dmax 88 92 % Shutdown Supply Current ISD 0.01 1 µA OTP 160 TRS 140 Over Voltage Protection OVP 24 26 28 V Input Undervoltage Lockout UVP 2.35 2.5 2.65 V EN Input Low VEL 0.4 EN Input High VEH 1.5 EN Input Current IEN 0.1 2 µA Quiescent Current IQ Test Condition Switching, VFB = 0V Not Switching, VFB = 0.2V VFB = 0.2V Shutdown, temperature increasing Rising edge VIN rising or falling VFB = 0V VFB = 0.1V ISW = 100mA, V FB = 0.2V Restore, temperature decreasing VEN = 0V Over Temperature Protection oC EN = GND or VIN VSW = 20V V
AME, Inc. White LED Boost Converter In Tiny PackageAME5142 Rev. A.01 n Detailed Description The AME5142 is a constant frequency step-up con- verter with an internal switch. The operations of AME5142 can be understood from block diagram clearly figure.2. The oscillator triggers the SET input of SR latch to turn on the power switch MS at the start of each cycle. A current sense voltage sum with a stabilizing ramp is con- nected to the positive terminal of the PWM comparator. When this voltage exceeds the output voltage of the error amplifier, the SR latch is reset to turn off the power switch till next cycle starts. The output voltage of the error am- plifier is amplified from the difference between the refer- ence voltage 0.15V and the feedback voltage. In this man- ner, if the error amplifiers voltage increases, more current is delivered to the output; if it decreases, less current is delivered. A 26V Zener diode connects from OVP pin to FB pin internally to provide an optional protection func- tion which prevents SW pin from over-voltage damage. Especially when the case of the feedback loop broken due to component wear-out or improper connection oc- curs. The behavior of OVP is to clamp the output voltage to 26V typically. This function is suitable for the applica- tions while driving white LEDs less than 6 in series. Current Limit Protection The AME5142 has current limiting protection to prevent excessive stress on itself and external components dur- ing overload conditions. The internal current limit com- parator will disable the NMOS power device at a typical switch peak current limit of 850mA. Output Over-Voltage Protection The AME5142 contains dedicated circuitry for monitor- ing the output voltage. In the event that the primary LED network is disconnected the output will increase and be limited to 26V (TYP), which will turn the NMOS off when the output voltage is at 26V (max.) until the output volt- age reach 26V (TYP.) or lower. The 26V limit allows the use of 26V 1 µF ceramic output capacitors creating an overall small solution for white LED applications. Under Voltage Protection The AME5142 has an UVP comparator to turn the NMOS power device off in case the input voltage or battery volt- age is too low preventing an on state of the power device conducting large amounts of current. Inductor Selection The recommended value of inductor for AME5142 ap- plications is 10µH. Small size and better efficiency are the major concerns for portable device, such as AME5142 used for dual panel mobile phone. The inductor should have low DCR for better efficiency. To avoid inductor satu- ration, current rating should be at least 1A. The input range is 2.7V to 5.5V. Capacitor Selection 4.7µF input capacitor can reduce input ripple. For bet- ter voltage stability, to increase the input capacitor value or using LC filter is feasible, especially in the Li-ion bat- tery application. 1µF output capacitor is sufficient to re- duce output voltage ripple. For better voltage filtering, ceramic capacitors with low ESR are recommended. X5R and X7R types are suitable because of their wider volt- age and temperature ranges. Diode Selection Schottky diode is a good choice for AME5142 because of its lower forward voltage drop and faster reverse recov- ery. Using schottky diode can get better efficiency. The high speed rectification is also a good characteristic of schottky diode for high switching frequency. Current rat- ing of the diode must meet the root mean square of the peak current and output average current multiplication. Duty Cycle The maximum duty cycle of the switching regulator determines the maximum boost ratio of output-to- input voltage that the converter can attain in mode of operation. The duty cycle for a given boost application is defined as: This applies for continuous mode operation. VOUT + VDIODE - VIN VOUT + VDIODE - VSW D = n Application Hints
mined by power dissipation within the AME5142 switch. The device is turned off by pulling the shutdown pin low. order to let the dimming control perform correctly. Figure 5. PWM Dimming Control Using the EN Pin
AME, Inc. AME5142 White LED Boost Converter In Tiny Package Rev. A.01 88.0 88.2 88.4 88.6 88.8 89.0 89.2 89.4 89.6 89.8 90.0 90.2 90.4 90.6 90.8 91.0 91.2 91.4 91.6 91.8 92.0 -25 0 25 50 75 100 125 Temperature (oC) Max Duty Cycle (%) Max Duty Cycle vs. Temperature 0.90 0.95 1.00 1.05 1.10 1.15 1.20 1.25 1.30 1.35 1.40 1.45 1.50 -25 0 25 50 75 100 125 Temperature (oC) Oscillator Frequency (MHz) Oscillator Frequency vs. Temperature 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60 1.80 VIN (V) RDSON (Ω ) TA = 25oC TA = 85oC Switch RDSON 100 VIN (V) Efficiency (%) Efficiency vs. Load Current Dirving 3 LEDs 100 VIN (V) Efficiency (%) Efficiency vs. Load Current Dirving 4 LEDs 100 VIN (V) Efficiency (%) Efficiency vs. Load Current Dirving 6 LEDs
AME, Inc. White LED Boost Converter In Tiny PackageAME5142 Rev. A.01 650 700 750 800 850 900 950 1000 VIN (V) Current Limit (mA) Current Limit vs. VIN 0.137 0.141 0.145 0.149 0.153 0.157 0.161 0.165 0.169 0.173 0.177 -25 0 25 50 75 100 125 Temperature (oC) VFB (V) VFB vs. Temperature 1mS / div VIN = 2.7V; 6 LEDs IOUT = 20mA 2) EN = 1V / div, DC f = 200Hz 3) VOUT , 10V / div, DC 1) VSW= 10V / div, DC Dimming Control for Driving 6LEDs 1mS / div Dimming Control for Driving 6LEDs VIN = 5.5V; 6 LEDs IOUT = 20mA 2) EN = 1V / div, DC f = 200Hz 3) VOUT , 10V / div, DC 1) VSW = 10V / div, DC
AME, Inc. AME5142 White LED Boost Converter In Tiny Package Rev. A.01 4mS / div VIN = 2.7V; 6 LEDs IOUT = 20mA 2) EN = 1V / div, DC f = 200KHz 3) VOUT , 10V / div, DC 1) VSW = 10V / div, DC Dimming Control for Driving 6LEDs 4mS / div VIN = 5.5V; 6 LEDs IOUT = 20mA 2) EN = 1V / div, DC f = 200KHz 3) VOUT , 10V / div, DC 1) VSW = 10V / div, DC Dimming Control for Driving 6LEDs 200mS / Div VIN = 2.7V; 1 LEDs IOUT = 20mA 1) EN = 2V/div, DC 2) Inductor Current, 100mA / div, DC 3) VOUT , 2V / div, DC Start-Up / Shutdown 200mS / div Start-Up / Shutdown VIN = 2.7V; 6 LEDs IOUT = 20mA 1) EN = 2V / div, DC 2) Inductor Current, 500mA / div, DC 3) VOUT , 10V / div, DC
AME, Inc. White LED Boost Converter In Tiny PackageAME5142 Rev. A.01 200mS / div VIN = 5.5V; 6 LEDs IOUT = 20mA 1) EN = 2V / div, DC 2) Inductor Current, 500mA / div, DC 3) VOUT , 10V / div, DC Start-Up / Shutdown 1mS / div VIN = 2.7V; 6 LEDs IOUT = 20mA 1) VSW = 10V / div, DC 2) VOUT , 20mV / div, AC 3) Input Current, 100mA / div, DC Inductor = 10µH, COUT = 1µF Typical Switching Waveform 1mS / div VIN = 5.5V; 6 LEDs IOUT = 20mA 1) VSW = 10V / div, DC 2) VOUT , 20mV / div, AC 3) Input Current, 100mA / div, DC Inductor = 10µH, COUT = 1µF Typical Switching Waveform
AME, Inc. AME5142 White LED Boost Converter In Tiny Package Rev. A.01 n Date Code Rule 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 Marking Date Code n Tape and Reel Dimension SOT-25 Package Carrier Width (W) Pitch (P) Part Per Full Reel Reel Size SOT-25 8.0±0.1 mm 4.0±0.1 mm 3000pcs 180±1 mm W P AME AME PIN 1 Carrier Tape, Number of Components Per Reel and Reel Size
AME, Inc. White LED Boost Converter In Tiny PackageAME5142 Rev. A.01 Package Carrier Width (W) Pitch (P) Part Per Full Reel Reel Size TSOT-25 8.0±0.1 mm 4.0±0.1 mm 3000pcs 180±1 mm n Tape and Reel Dimension TSOT-25 Carrier Tape, Number of Components Per Reel and Reel Size W P AME AME PIN 1 Carrier Tape, Number of Components Per Reel and Reel Size SOT-26 PIN 1 W P AME AME Package Carrier Width (W) Pitch (P) Part Per Full Reel Reel Size SOT-26 8.0±0.1 mm 4.0±0.1 mm 3000pcs 180±1 mm
AME, Inc. AME5142 White LED Boost Converter In Tiny Package Rev. A.01 Package Carrier Width (W) Pitch (P) Part Per Full Reel Reel Size TSOT-26 8.0±0.1 mm 4.0±0.1 mm 3000pcs 180±1 mm n Tape and Reel Dimension Carrier Tape, Number of Components Per Reel and Reel Size TSOT-26 PIN 1 W P AME AME
AME, Inc. White LED Boost Converter In Tiny PackageAME5142 Rev. A.01 n Package Dimension SOT-25 L Top View Side View Front View D e E H b A MIN MAX MIN MAX A A1 0.00 0.15 0.0000 0.0059 b 0.30 0.55 0.0118 0.0217 D 2.70 3.10 0.1063 0.1220 E 1.40 1.80 0.0551 0.0709 e H 2.60 3.00 0.10236 0.11811 L q1 0o 10o 0o 10o 0.37BSC 0.0146BSC 0.95BSC 0.0374BSC 1.90 BSC 0.07480 BSC SYMBOLS MILLIMETERS INCHES 1.20REF 0.0472REF L Top View Side View Front View D e E H b A TSOT-25 MIN MAX MIN MAX A+A1 0.90 1.25 0.0354 0.0492 b 0.30 0.50 0.0118 0.0197 c 0.09 0.25 0.0035 0.0098 D 2.70 3.10 0.1063 0.1220 E 1.40 1.80 0.0551 0.0709 e H 2.40 3.00 0.09449 0.11811 L q1 0o 10o 0o 10o 0.35BSC 0.0138BSC 0.95BSC 0.0374BSC 1.90 BSC 0.07480 BSC SYMBOLS MILLIMETERS INCHES
AME, Inc. AME5142 White LED Boost Converter In Tiny Package Rev. A.01 n Package Dimension TSOT-26 Top View Side View Front View L D e E H b AA1 MIN MAX MIN MAX A+A1 0.90 1.25 0.0354 0.0492 b 0.30 0.50 0.0118 0.0197 D 2.70 3.10 0.1063 0.1220 E 1.40 1.80 0.0551 0.0709 e H 2.40 3.00 0.09449 0.11811 L q1 0o 10o 0o 10o 0.35BSC 0.0138BSC 0.95BSC 0.0374BSC 1.90 BSC 0.07480 BSC SYMBOLS MILLIMETERS INCHES SOT-26 Top View Side View Front View L D e E H b AA1 MIN MAX MIN MAX A A1 0.00 0.15 0.0000 0.0059 b 0.30 0.55 0.0118 0.0217 D 2.70 3.10 0.1063 0.1220 E 1.40 1.80 0.0551 0.0709 e H 2.60 3.00 0.10236 0.11811 L q1 0o 10o 0o 10o 1.90 BSC 0.0748 BSC SYMBOLS MILLIMETERS INCHES 1.20REF 0.0472REF 0.37REF 0.0146REF 0.95REF 0.0374REF
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. , July 2007 Document: 1229-DS5142-A.01 Corporate Headquarter U.S.A. (Subsidiary) AME, Inc. Analog Microelectronics, Inc. 2F, 302 Rui-Guang Road, Nei-Hu District 3100 De La Cruz Blvd., Suite 201 Taipei 114, Taiwan. Santa Clara, CA. 95054-2438 Tel: 886 2 2627-8687 Tel : (408) 988-2388 Fax: 886 2 2659-2989 Fax: (408) 988-2489 www.ame.com.tw E-Mail: sales@ame.com.tw