ME3101A12M5G

ME3101 500mA Synchronous Step-Down DC/DC Converters ME3101 Series General Description Features ME3101 series is a group of synchronous rectification type DC/DC converters with a built-in 0.6Ω P-channel driver transistor and 0.7Ω N-channel switching transistor, designed to allow the use of ceramic capacitors. The ICs enable a high efficiency, stable power supply with an output current of 500mA to be configured using only a coil and two capacitors connected externally. With the built-in oscillator, oscillation frequency is 1.2MHz.As for operation mode, the ME3101 series can be manually switched with automatic PWM/PFM switching control mode, allowing fast response, low ripple and high efficiency over the full range of load (from light load to high output current conditions). During standby, all circuits are shutdown to reduce current consumption to as low as 1.0μA or less. Selection Guide l l l l l l l l l l Synchronous Step-Down DC/DC High Efficiency :93%(TYP) Low Ripple Voltage :10mV Output Current :500mA Oscillation Frequency :1.2MHz PWM/PFM Automatic Switching Control Maximum Duty Ratio :100% Ceramic Capacitor Compatible Ultra Small Packages :SOT-23-5 Soft-start ciruit built-in Typical Application l l l l l l l l l Mobile phones (PDC, GSM, CDMA, IMT200 etc.) Bluetooth equipment PDA Portable communication modem Portable games Cameras Digital cameras Cordless phones Notebook computers Typical Application Circuit V5.0 www.microne.com.cn 1 ME3101 Pin Configuration ME3101AXX ME3101AXX-DS Pin Assignment ME3101AXX Pin Name Function 1 VIN Power Input 2 VSS VSS 3 CE/MODE Chip Enable / Mode Switch 4 VOUT Output Voltage Sence 5 LX Switching Output Pin Name Function 1 CE/MODE Chip Enable / Mode Switch 2 VSS VSS 3 LX Switching Output 4 VIN Power Input 5 VOUT Output Voltage Sence Pin Number ME3101AXX-DS Pin Number V5.0 www.microne.com.cn 2 ME3101 Absolute Maximum Ratings PARAMETER SYMBOL RATINGS UNITS VIN Pin Voltage Vin -0.3～6.5 V Lx Pin Voltage Vlx -0.3～Vin+0.3 V VOUT Pin Voltage Vout -0.3～6.5 V CE / MODE Pin Voltage Vce -0.3～Vin+0.3 V Lx Pin Current Ilx ±1000 mA Power Dissipation(SOT-23-5L) Pd 250 mW Operating Temperature Range TOpr -25~+85 ℃ Storage Temperature Range Tstg -40~+125 ℃ Block Diagram V5.0 www.microne.com.cn 3 ME3101 Electrical Characteristics ME3101A10 ( Unless Otherwise Stated ,VIN=3.0V，FOSC=1.2MHz, Cin=4.7uF，CL＝10uF，L＝3.3uH，Ta=25℃ ) UNIT CIRCUIT PARAMETER SYMBOL CONDITIONS MIN. TYP. MAX. 0.98 1.0 1.02 V ① Vin 2 － 6 V ① Iout.max － 500 － mA ① － 1.2 － V ② Output Voltage Vout Operating Voltage Range Maximum Output Current Vce＝Vin,Iout＝30mA U.V.L.O . Voltage Vuvlo Vce＝Vin,Vout＝0V, LX Voltage which Lx pin voltage holding "L" level Supply Current Idd Vin＝Vce＝3.0V， Vout＝Vout×1.1 － 55 － uA ③ Stand-by Current Istb Vin＝3.0V，Vce＝0V， Vout＝Vout×1.1 － 0 1 uA ③ Frequency FOSC Iout＝100mA 1020 1200 1380 KHz ① PFM Switch Current Ipfm Vce＝Vin，Iout＝1mA － 180 － mA ① Maximum Duty Ratio Maxdty Vce＝Vin，Vout＝0 100 － － ％ ④ Minimum Duty Ratio Mindty Vce＝Vout＝Vin － － 0 ％ ④ Efficiency EFFI Vce＝Vin＝2.5V， Iout＝100mA － 90 － ％ ① Lx SW “H” ON Resistance RlxH Vce＝0.5Vin，Vce＝0V， Ilx＝100mA － 0.5 1.2 Ω ⑤ Lx SW “L” ON Resistance RlxL Vce＝0.5Vin，Ilx＝100mA － 0.6 1.4 Ω － Lx SW “H” Leak Current IleakH Vin＝Vout＝5.0V， Vce＝0V，Lx＝0V － 0.01 1 uA ⑥ Lx SW “L” Leak Current IleakL Vin＝Vout＝5.0V， Vce＝0V，Lx＝5V － 0.01 1 uA ⑥ Current Limit Ilim Vin＝Vce＝5.0V，Vout＝0V － 800 － mA ⑦ Output Voltage Temperature Characteristics Vout/ (Vout*⊿topr) Iout=30mA,-40℃≤Topr≤85℃ － +100 － ppm/℃ ① CE “H” Voltage VceH Vout＝0V 0.7 － Vin V ⑧ CE “L” Voltage VceL Vout＝0V Vss － 0.6 V ⑧ CE “H” Current Iceh Vin＝Vce＝5.5V，Vout＝0V -0.1 － 0.1 uA ⑧ V5.0 www.microne.com.cn 4 ME3101 CE “L” Current Icel Vin＝5.5V，Vce＝0V， Vout＝0V -0.1 － 0.1 uA ⑧ Soft-Start Time Tss Vce＝0V～Vin，Iout＝1mA 0.5 1.2 3.0 msec ① Latch Time Tlat Vin＝Vce＝5.0V 1 － 20 msec ⑨ ME3101A12 ( Unless Otherwise Stated ,VIN=3.0V，FOSC=1.2MHz, Cin=4.7uF，CL＝10uF，L＝3.3uH，Ta=25℃ ) PARAMETER SYMBOL CONDITIONS MIN. TYP. Output Voltage Vout Vce＝Vin,Iout＝30mA 1.176 1.2 Operating Voltage Range Vin 2 Maximum Output Current Iout.max VIN=2.5V U.V.L.O . Voltage MAX. UNIT CIRCUIT 1.224 V ① － 6 V ① 500 － － mA ① Vuvlo Vce＝Vin,Vout＝0V, LX Voltage which Lx pin voltage holding "L" level 1 1.4 1.78 V ② Supply Current Idd Vin＝Vce＝3.0V， Vout＝Vout×1.1 － 60 120 uA ③ Stand-by Current Istb Vin＝3.0V，Vce＝0V， Vout＝Vout×1.1 － 0 1 uA ③ Frequency FOSC Iout＝100mA 1020 1200 1380 KHz ① PFM Switch Current Ipfm Vce＝Vin，Iout＝1mA 100 140 180 mA ① Maximum Duty Ratio Maxdty Vce＝Vin，Vout＝0 100 － － ％ ④ Minimum Duty Ratio Mindty Vce＝Vout＝Vin － － 0 ％ ④ Efficiency EFFI Vce＝Vin＝2.5V， Iout＝100mA － 90 － ％ ① Lx SW “H” ON Resistance RlxH Vce＝0.5Vin，Vce＝0V， Ilx＝100mA － 0.5 1.2 Ω ⑤ Lx SW “L” ON Resistance RlxL Vce＝0.5Vin，Ilx＝100mA － 0.6 1.4 Ω － Lx SW “H” Leak Current IleakH Vin＝Vout＝5.0V， Vce＝0V，Lx＝0V － 0.01 1 uA ⑥ Lx SW “L” Leak Current IleakL Vin＝Vout＝5.0V， Vce＝0V，Lx＝5V － 0.01 1 uA ⑥ Current Limit Ilim Vin＝Vce＝5.0V，Vout＝0V 600 700 － mA ⑦ Output Voltage Temperature Characteristics Vout/ (Vout*⊿topr) Iout=30mA,-40℃≤Topr≤85℃ － +100 － ppm/℃ ① V5.0 www.microne.com.cn 5 ME3101 CE “H” Voltage VceH Vout＝0V 0.9 － Vin V ⑧ CE “L” Voltage VceL Vout＝0V Vss － 0.3 V ⑧ CE “H” Current Iceh Vin＝Vce＝5.5V，Vout＝0V -0.1 － 0.1 uA ⑧ CE “L” Current Icel Vin＝5.5V，Vce＝0V， Vout＝0V -0.1 － 0.1 uA ⑧ Soft-Start Time Tss Vce＝0V～Vin，Iout＝1mA 0.5 1.0 3.0 msec ① Latch Time Tlat Vin＝Vce＝5.0V 1 － 20 msec ⑨ ME3101A18 ( Unless Otherwise Stated ,VIN=3.6V，FOSC=1.2MHz, Cin=4.7uF，CL＝10uF，L＝3.3uH，Ta=25℃ ) PARAMETER SYMBOL CONDITIONS MIN. TYP. MAX. UNIT CIRCUIT 1.764 1.8 1.836 V ① 2 － 6 V ① VIN=3.0V 500 － － mA ① Vuvlo Vce＝Vin,Vout＝0V, LX Voltage which Lx pin voltage holding "L" level 1 1.4 1.78 V ② Supply Current Idd Vin＝Vce＝3.6V， Vout＝Vout×1.1 － 60 120 uA ③ Stand-by Current Istb Vin＝3.6V，Vce＝0V， Vout＝Vout×1.1 － 0 1 uA ③ Frequency FOSC Iout＝100mA 1020 1200 1380 KHz ① PFM Switch Current Ipfm Vce＝Vin，Iout＝1mA 100 140 180 mA ① Maximum Duty Ratio Maxdty Vce＝Vin，Vout＝0 100 － － ％ ④ Minimum Duty Ratio Mindty Vce＝Vout＝Vin － － 0 ％ ④ Efficiency EFFI Vce＝Vin＝3.0V， Iout＝100mA － 90 － ％ ① Lx SW “H” ON Resistance RlxH Vce＝0.5Vin，Vce＝0V， Ilx＝100mA － 0.5 1.2 Ω ⑤ Lx SW “L” ON Resistance RlxL Vce＝0.5Vin，Ilx＝100mA － 0.6 1.4 Ω － Lx SW “H” Leak Current IleakH Vin＝Vout＝5.0V， Vce＝0V，Lx＝0V － 0.01 1 uA ⑥ Lx SW “L” Leak Current IleakL Vin＝Vout＝5.0V， Vce＝0V，Lx＝5V － 0.01 1 uA ⑥ Current Limit Ilim Vin＝Vce＝5.0V，Vout＝0V 600 700 － mA ⑦ Output Voltage Vout/ Iout=30mA,-40℃≤Topr≤85℃ － +100 － ppm/℃ ① Output Voltage Vout Operating Voltage Range Vin Maximum Output Current Iout.max U.V.L.O . Voltage V5.0 Vce＝Vin,Iout＝30mA www.microne.com.cn 6 ME3101 Temperature Characteristics (Vout*⊿topr) CE “H” Voltage VceH Vout＝0V 0.9 － Vin V ⑧ CE “L” Voltage VceL Vout＝0V Vss － 0.3 V ⑧ CE “H” Current Iceh Vin＝Vce＝5.5V，Vout＝0V -0.1 － 0.1 uA ⑧ CE “L” Current Icel Vin＝5.5V，Vce＝0V， Vout＝0V -0.1 － 0.1 uA ⑧ Soft-Start Time Tss Vce＝0V～Vin，Iout＝1mA 0.5 1.0 3.0 msec ① Latch Time Tlat Vin＝Vce＝5.0V 1 － 20 msec ⑨ ME3101A33 ( Unless Otherwise Stated ,VIN=5V，FOSC=1.2MHz, Cin=4.7uF，CL＝10uF，L＝3.3uH，Ta=25℃ ) PARAMETER SYMBOL CONDITIONS MIN. TYP. MAX. UNIT CIRCUIT Output Voltage Vout Vce＝Vin,Iout＝30mA 3.234 3.3 3.366 V ① Operating Voltage Range Vin 2 － 6 V ① Maximum Output Current Iout.max VIN=4.5V 500 － － mA ① U.V.L.O . Voltage Vuvlo Vce＝Vin,Vout＝0V, LX Voltage which Lx pin voltage holding "L" level 1 1.4 1.78 V ② Supply Current Idd Vin＝Vce＝5V， Vout＝Vout×1.1 － 60 120 uA ③ Stand-by Current Istb Vin＝5V，Vce＝0V， Vout＝Vout×1.1 － 0 1 uA ③ Frequency FOSC Iout＝100mA 1020 1200 1380 KHz ① PFM Switch Current Ipfm Vce＝Vin，Iout＝1mA 100 140 180 mA ① Maximum Duty Ratio Maxdty Vce＝Vin，Vout＝0 100 － － ％ ④ Minimum Duty Ratio Mindty Vce＝Vout＝Vin － － 0 ％ ④ Efficiency EFFI Vce＝Vin＝4.5V， Iout＝100mA － 93 － ％ ① Lx SW “H” ON Resistance RlxH Vce＝0.5Vin，Vce＝0V， Ilx＝100mA － 0.5 1.2 Ω ⑤ Lx SW “L” ON Resistance RlxL Vce＝0.5Vin，Ilx＝100mA － 0.6 1.4 Ω － Lx SW “H” Leak Current IleakH Vin＝Vout＝5.0V， Vce＝0V，Lx＝0V － 0.01 1 uA ⑥ Lx SW “L” Leak Current IleakL Vin＝Vout＝5.0V， Vce＝0V，Lx＝5V － 0.01 1 uA ⑥ Current Limit Ilim Vin＝Vce＝5.0V，Vout＝0V 600 700 － mA ⑦ Output Voltage Vout/ Iout=30mA,-40℃≤Topr≤85℃ － ±100 － ppm/℃ ① V5.0 www.microne.com.cn 7 ME3101 Temperature Characteristics (Vout*⊿topr) CE “H” Voltage VceH Vout＝0V 1.1 － Vin V ⑧ CE “L” Voltage VceL Vout＝0V Vss － 0.3 V ⑧ CE “H” Current Iceh Vin＝Vce＝5.5V，Vout＝0V -0.1 － 0.1 uA ⑧ CE “L” Current Icel Vin＝5.5V，Vce＝0V， Vout＝0V -0.1 － 0.1 uA ⑧ Soft-Start Time Tss Vce＝0V～Vin，Iout＝1mA 0.5 1.0 3.0 msec ① Latch Time Tlat Vin＝Vce＝5.0V 1 － 20 msec ⑨ Note On Use： 1. 2. 3. 4. 5. 6. 7. 8. Use Ceramic Capacitor will achieve low ripple and high efficiency. When the difference between VIN and VOUT is large in PWM control, very narrow pulses will be outputted, and there is the possibility that some cycles may be skipped completely. When the difference between VIN and VOUT is small, and the load current is heavy, very wide pulses will be outputted and there is the possibility that some cycles may be skipped completely: in this case, the Lx pin may not go low at all. With the IC, the peak current of the coil is controlled by the current limit circuit. Since the peak current increases when dropout voltage or load current is high, current limit starts operating, and this can lead to instability. When peak current becomes high, please adjust the coil inductance value and fully check the circuit operation. In addition, please calculate the peak current according to the following formula: Ipk = (VIN-VOUT) * On Duty / (2* L* FOSC) + IOUT L: Coil Inductance Value FOSC: Oscillation Frequency When VIN is less than 2.4V, limit current may not be reached because voltage falls caused by ON resistance. Care must be taken when laying out the PC Board, in order to prevent misoperation of the current limit mode. Depending on the state of the PC Board, latch time may become longer and latch operation may not work. In order to avoid the effect of noise, the board should be laid out so that capacitors are placed as close to the chip as possible. Use of the IC at voltages below the recommended voltage range may lead to instability. When the IC is used in high temperature, output voltage may increase up to input voltage level at no load because of the leak current of the driver transistor. V5.0 www.microne.com.cn 8 ME3101 Typical Applications V5.0 www.microne.com.cn 9 ME3101 Type Characteristics (1) Efficiency vs. Output Current 1.00 0.95 0.95 0.90 0.85 0.80 VIN=4V VIN=4.5V VIN=5V VIN=6V 0.75 0.70 0.65 0.60 0.85 0.80 0.75 VIN=5V,VOUT=3.3V L=3.3uH,Cin=4.7uF,Cout=10uF L=4.7uH,Cin=4.7uF,Cout=10uF L=4.7uH,Cin=2.2uF,Cout=10uF L=4.7uH,Cin=1uF,Cout=10uF 0.70 0.65 0.55 0.50 -100 EFFICIENCY (%) EFFICIENVY (%) 0.90 0 100 200 300 400 500 600 700 0.60 -100 0 100 200 300 400 500 600 700 IOUT (mA) IOUT (mA) VIN=6V,VOUT=3.3V L=3.3uH,Cin=4.7uF,Cout=10uF L=4.7uH,Cin=4.7uF,Cout=10uF L=4.7uH,Cin=2.2uF,Cout=10uF L=4.7uH,Cin=1uF,Cout=10uF 1.00 0.95 EFFICIENCY (%) 0.90 0.85 0.80 0.75 0.70 0.65 0.60 -100 0 100 200 300 400 500 600 700 IOUT (mA) V5.0 www.microne.com.cn 10 ME3101 (2) Output Voltage vs. Output Current (3) Input Current vs. Output Current 800 3.50 OUTPUT VOLTAGE (V) 3.45 3.40 3.35 3.30 3.25 3.20 3.15 3.10 3.05 3.00 -100 0 100 200 300 400 500 600 700 VIN=4V VIN=4.5V VIN=5V VIN=6V 700 INPUT CURRENT (mA) VIN=4V VIN=4.5V VIN=5V VIN=6V 600 500 400 300 200 100 0 -100 0 100 200 300 400 500 600 700 IOUT (mA) IOUT (mA) (4) Linear Transient Response Time R=33Ω,IOUT=100mA，VIN=0~5V R=11Ω,IOUT=300mA，VIN=0~5V R=6Ω,IOUT=550mA，VIN=0~5V V5.0 www.microne.com.cn 11 ME3101 (5) Load Response VIN=5V,IOUT=0~100mA VIN=5V,IOUT=100~0mA VIN=5V,IOUT=0~300mA VIN=5V,IOUT=300~0mA VIN=5V,IOUT=0~550mA VIN=5V,IOUT=550~0mA V5.0 www.microne.com.cn 12 ME3101 Packaging Information SOT23-5 V5.0 www.microne.com.cn 13 ME3101 l l l l l V5.0 The information described herein is subject to change without notice. Nanjing Micro One Electronics Inc is not responsible for any problems caused by circuits or diagrams described herein whose related industrial properties, patents, or other rights belong to third parties. The application circuit examples explain typical applications of the products, and do not guarantee the success of any specific mass-production design. Use of the information described herein for other purposes and/or reproduction or copying without the express permission of Nanjing Micro One Electronics Inc is strictly prohibited. The products described herein cannot be used as part of any device or equipment affecting the human body, such as exercise equipment, medical equipment, security systems, gas equipment, or any apparatus installed in airplanes and other vehicles, without prior written permission of Nanjing Micro One Electronics Inc. Although Nanjing Micro One Electronics Inc exerts the greatest possible effort to ensure high quality and reliability, the failure or malfunction of semiconductor products may occur. The user of these products should therefore give thorough consideration to safety design, including redundancy, fire-prevention measures, and malfunction prevention, to prevent any accidents, fires, or community damage that may ensue. www.microne.com.cn 14