AMS1309 Descriptions: AMS1309 Series is a PFM Step-up DC/DC converter IC with low supply current by CMOS process. High frequency noise that occurs during switching is reduced by using advanced circuit designed, output voltage is programmable in 0.1V steps between 2.0~7.0V and maximum frequency is 180 KHz(Typ.). A low ripple, high efficiency step-up DC/DC converter can be constructed of AMS1309 with only three external components. Also available is a CE(chip enable) function that reduce power dissipation During shut-down mode. AMS1309 is suitable for use with battery-powered instruments with low noise and low supply current. Featuers: Low ripple and low noise Operating voltage range: 0.9V~6.5V Output voltage range: 2.0V~7.0V(step 0.1V) Output voltage accuracy: ±2.5% Output Current: if Vin=3.0V and Vout=5.0V,then Iout=400mA Low start voltage: 0.9V(at Iout=1mA) Maximum oscillator frequency: 180KHz(Typ.) High Efficiency: 85%(Typ.) Packge:SOT23: SOT89 Applications: Power source for battery-powered equipment Power source for wireless mouse, wireless keyboard, toys Power source for Cameras,camcorders, VCRs, PDAs Power source for hand-held communication equipment 1 Advanced Monolithic Systems http://www.ams-semitech.com AMS1309 Part No. AMS1309Axx AMS1309Bxx AMS1309Cxx AMS1309Dxx AMS1309F Suffix Package M3 P M3 P M5 P M5 P SOT-23-3L SOT-89-3L SOT-23-3L SOT-89-3L SOT-23-5L SOT-89-5L SOT-23-5L SOT-89-5L M5 Transistor CE Vdd FB Feature Inside No No No Standard Outside No No No External Inside Yes No No Outside Yes No No SOT-23-5L Outside No Yes Yes Standard Enable External Enable External Adjustable Package Reference Pin Functions AMS1309Axx Pin # SOT-23-3 1 3 2 AMS1309Bxx SOT-89-3 1 2 3 Pin # SOT-23-3 1 3 2 AMS1309Cxx SOT-89-3 1 2 3 Pin # SOT-23-5 4 2 5 1 3 SOT-89-5 5 2 4 3 1 Symbol Description Vss Vout Lx Ground Power Output Switch Symbol Vss Vout Ext Description Ground Power Output External Description Symbol Vss Vout Lx CE NC Ground Power Output Switch On/Off Control Input. null 2 Advanced Monolithic Systems http://www.ams-semitech.com AMS1309 AMS1309Dxx Pin # SOT-23-5 SOT-89-5 4 5 2 2 5 4 1 3 3 1 AMS1309Fxx Pin # SOT-23-5 1 2 3 4 5 Symbol Description Vss Vout Ext CE NC Ground Power Output External On/Off Control Input. null Symbol Description FB Vdd NC Vss EXT Feedback Power Input null Ground External Functional Block Diagram Absolute Maximum Ratings Parameter Input Voltage Switch Voltage EXT Pin Voltage CE Pin Voltage Lx Pin Current EXT Pin Current Power SOT23 Dissipation SOT89 Operating Temperature Storage Temperature Soldering Temperature and Time Symbol VIN VLX VEXT VCE ILX IEXT Pd Pd TOpr Tstg Tsolder Margin 6.5 6.5 -0.3~Vout+0.3 -0.3~Vout+0.3 600 ±30 300 500 -25~+85 -40~+125 260℃, 10s Units V V V V mA mA mW mW ℃ ℃ 3 Advanced Monolithic Systems http://www.ams-semitech.com AMS1309 Electrical Characteristics （Test Condition: VIN=Vout*0.6，VSS=0V，IOUT=10mA，Topt =25℃。unless otherwise noted. ） Fosc=180kHz Symbol Parameters VOUT Output Voltage Vstart Startup Voltage Vhold Hold Voltage IDD1 Input Current 1 IDD2 Input Current 2 ILX Switch On Current ILXleak Switch Leak Current Fosc Oscillator Frequency Maxdty Maximum Duty Cycle Efficiency η AMS1309Bxx/Dxx Condition MIN TYP MAX Units Vout*0.975 vout Vout*1.025 V 0.8 0.9 V IOUT=1mA， VIN：0→2V IOUT=1mA， VIN：2→0V No External Component Vout=Vout*0.95 Vout=Vout+0.5V VLX=0.4V, Vout=Vout*0.95 Vout=VLX=6V Vout=set Vout*0.95 on(VLX“L”)side 0.45 V 50 µA 9 µA 360 mA 0.5 µA 180 kHz 84 85 % % Fosc=180kHz Symbol Parameters VOUT Output Voltage Vstart Startup Voltage Vhold Hold Voltage IDD1 Input Current 1 IDD2 Input Current 2 ILX Switch On Current ILXleak Switch Leak Current Fosc Oscillator Frequency Maxdty Maximum Duty Cycle Efficiency η Condition IOUT=1mA， VIN：0→2V IOUT=1mA， VIN：2→0V No External Component Vout=Vout*0.95 Vout=Vout+0.5V VLX=0.4V, Vout=Vout*0.95 Vout=VLX=6V Vout=set Vout*0.95 on(VLX“L”)side MIN TYP MAX Units Vout*0.975 vout Vout*1.025 V 0.8 0.9 V 0.45 V 80 µA 12 µA 360 mA 0.5 µA 180 kHz 84 85 % % 4 Advanced Monolithic Systems http://www.ams-semitech.com AMS1309 AMS1309F33 VFB=3.3V , Fosc=180kHz Symbol Parameters Vfb Feedback Voltage Vstart Startup Voltage Vhold Hold Voltage IDD1 Input Current 1 IDD2 Input Current 2 ILX Switch On Current ILXleak Switch Leak Current Fosc Oscillation Frequency Maxdty Maximum Duty Cycle Efficiency η Condition MIN TYP MAX Units 3.22 3.30 3.38 V 0.8 0.9 V IOUT=1mA， VIN：0→2V IOUT=1mA， VIN：2→0V No External Component Vout=Vout*0.95 Vout=Vout+0.5V VLX=0.4V, Vout=Vout*0.95 0.45 V 80 µA 10 µA 360 mA Vout=VLX=6V Vout=set Vout*0.95 on(VLX“L”)side 0.5 180 84 85 1、Diode: Schottky ( VF: 0.2V) , For example: IN5817,IN5819 2、Inductor: 33 μH（r<0.1Ω） 3、Capacitor: 100uF Step-Up Converter 5 Advanced Monolithic Systems http://www.ams-semitech.com µA kHz % % AMS1309 TYPICAL APPLICATION Inductor : 3 3 u H Capacitor : 100uF/16V(Tantalum Capacitor) NMOS：AAT9460、XP151、XP161 Diode : IN5817、IN5819 Transistor : 2SD1628G、2SD3279 Base Resistor : 1KΩ Base Capacitor : 2200pF RFB ：RFB1/RFB2=Vout/VFB-1 (Vout= Output Voltage) ，RFB1+RFB2≤2MΩ CFB ：Adjust L,CL.，Fzfb=1/(2×π×CFB×RFB1) 6 Advanced Monolithic Systems http://www.ams-semitech.com AMS1309 Typical Performance Characteristics （1） Output Voltage VS Output Current Topr＝25℃ ME2108A33 （2） Efficiency VS Output Current Topr＝25℃ 7 Advanced Monolithic Systems http://www.ams-semitech.com AMS1309 （3） Quiescent Current VS Input Current Topr＝25℃ （4 ） Input Current(No Load) VS Output Voltage （L＝47uH，Cout＝47uF，Vout=100uF，SD：1N5717/5819） Topr＝25℃ 8 Advanced Monolithic Systems http://www.ams-semitech.com AMS1309 （5） Input Current 1 VS Output Voltage （VDD=VOUT*0.95） Topr＝25℃ （6） Input Current 2 VS Output Voltage （VDD=VOUT＋0.5） Topr＝25℃ 9 Advanced Monolithic Systems http://www.ams-semitech.com AMS1309 （7）Maximum Oscillation Frequency VS Output Voltage （VDD＝VOUT*95%） Topr＝25℃ （8）Duty Circle VS Output Voltage （VDD＝VOUT*95%） Topr＝25℃ 10 Advanced Monolithic Systems http://www.ams-semitech.com AMS1309 Package 11 Advanced Monolithic Systems http://www.ams-semitech.com