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1、http:/ 1to10 TEL:0755-82985079 FAX:0755-82985153 LY9830-The LY9830 regulators are available in the The LY9830 is capable of supplying an output The LY9830 is high efficiency synchronous,F Fe ea at tu ur re es s?Up to 94%Efficiency?Low voltage start-up：0.9V?Shut-down current:1A?Input voltage：0.9V4.4V
2、?Output voltage：2.5V4.3V(Up to 5V with Schottky)?Low switch on resistance RDS(ON),Internal switch:0.35?1.4MHz fixed frequency switching?Automatic PWM/PFM mode switching?Low profile SOT-23-6L package(lead-free packaging is now available)A Ap pp pl li ic ca at ti io on ns s?Digital cameras and MP3?Pal
3、mtop computers/PDAs?Cellular phones?Wireless handsets and DSL modems?PC cards?Portable media players D De es sc cr ri ip pt ti io on n PWM step-up DC/DC converters optimized to provide a high efficient solution to medium power systems.The devices work under the input voltage between 0.9V and 4.4V wi
4、th a 1.4MHz fixed frequency switching.These features minimize overall solution footprint by allowing the use of tiny,low profile inductors and ceramic capacitors.Automatic PWM/PFM mode switching at light load saves power and improves efficiency.voltage between 2.5V and 4.3V,the internal synchronous
5、switch is desired to provide high efficiency without Schottky.industry standard SOT-23-6L power packages(or upon request).OOr rd de er r I In nf fo or rmma at ti io on n Symbol Description Denotes Output voltage:A:Adjustable Output Denotes Package Types:F:SOT-23-6L S Sy yn nc ch hr ro on no ou us s
6、B Bo oo os st t D DC C/D DC C R Re eg gu ul la at to or r LY9830http:/ 2to10 TEL:0755-82985079 FAX:0755-82985153 T Ty yp pi ic ca al l A Ap pp pl li ic ca at ti io on ns s Figure 1:Typical Application Circuit Figure 2:Single Cell to 3.3V Synchronous Boost Converter with Load Disconnect in Shutdown.G
7、NDDC+VOUTSWFBENVIN156243VOUTR1R2L 2.2uH0.9V to 4.4VCIN20uFCOUT20uFGND+VOUTSWFBENVIN156243VOUTR1R2L 2.2uHSINGLE AA CELLCIN4.7uFCOUT4.7uFONOFFDM1 SI2306DSR3 510K 1.02M 604K 2N3904 510KR4Q1LY9830http:/ 3to10 TEL:0755-82985079 FAX:0755-82985153 Figure 3:Single Lithium Cell to 5V with Load 250mA Figure 4
8、:Single Cell AA Cell to 3V Synchronous Boost Converter GND+VOUTSWFBENVIN156243VOUTR1R2L 4.7uHLITHIUMCELLCIN4.7uFCOUT4.7uFONOFFD 1.02M332KOPTIONALSNUBBER1nF100pF2GNDVOUT13V 90mASWFBENVIN156243VOUTR11.02ML 4.7uHCIN10uFCOUT110uFSINGLE AA CELLR2750KD1 D2C11uFCOUT210uFLY9830http:/ 4to10 TEL:0755-82985079
9、 FAX:0755-82985153The LY9830 are guaranteed to meet performance speci P Pi in n A As ss si ig gn nmme en nt t TOP VIEW SOT-23-6L A Ab bs so ol lu ut te e MMa ax xi immu umm R Ra at ti in ng gs s （Note 1）?VIN.-0.3 V +6.6V?VOUT.-0.3 V +6.6V?VSW.-0.3 V +6.6 V?VEN.-0.3 V +6.6 V?Operating Temperature Ran
10、ge（Note 2）-30 +85?Lead Temperature(Soldering 10 sec.)+300?Storage Temperature Range.-65 +125 Note 1:Absolute Maximum Ratings are those values beyond which the life of a device may be impaired.Note 2:fications from 0 C to 70 C.Specifications over the 30 C to 85 C operating temperature range are assur
11、e d by design,characterization and correlation with statistical process controls.PIN Number SOT-23-6L PIN Name Function 1 SW Switch Output 2 GND Ground 3 FB Feedback 4 EN ON/OFF Control(High Enable)5 VOUT Output 6 VIN Input 1 2 3 SW GND FBVIN VOUT EN6 5 4LY9830http:/ 5to10 TEL:0755-82985079 FAX:0755
12、-82985153 E El le ec ct tr ri ic ca al l C Ch ha ar ra ac ct te er ri is st ti ic cs s Operating Conditions:TA=25,VIN=1.2V,VOUT=3.3V unless otherwise specified.Note 3:Minimum VIN operation after start-up is only limited by the batterys ability to provide the necessary power as it enters a deeply dis
13、charged state.Note 4:Specification is guaranteed by design and not 100%tested in production.PARAMETER CONDITIONS MIN TYP MAX UNITS Output Voltage Range(Adj.)2.5 5 V Minimum Start-Up Voltage(Note 3)ILOAD=1mA 0.9 1.1 V Minimum Operating Voltage EN=VIN 0.6 0.75 V Switching Frequency 1.1 1.4 1.7 MHz Max
14、 Duty Cycle VFB=1.15V 80 87%Feedback Voltage 1.165 1.212 1.241 V Feedback Input Current VFB=1.22V(Note 4)1 nA NMOS Switch Leakage VSW=5V 0.1 5 A PMOS Switch Leakage VSW=0V 0.1 5 A NMOS Switch On Resistance VOUT=3.3V 0.35 PMOS Switch On Resistance VOUT=3.3V 0.45 NMOS Current Limit 700 850 mA Quiescen
15、t Current ILOAD=0mA 260 A Shutdown Current VEN=0V,Including Switch Leakage 0.1 1 A En Input High 1 V En Input Low 0.5 V En Input Current VEN=5.5V 0.01 1 A LY9830http:/ 6to10 TEL:0755-82985079 FAX:0755-82985153 T Ty yp pi ic ca al l P Pe er rf fo or rmma an nc ce e C Ch ha ar ra ac ct te er ri is st
16、ti ic cs s Efficiency vs.Output Current(Vout=3.3V)0102030405060708090100101001000Output Current(mA)Efficiency(%)VIN=1VVIN=1.5VVIN=1.2VEfficiency vs.Output Current(Vout=3.3V)0102030405060708090100101001000Output Current(mA)Efficiency(%)VIN=2VVIN=2.5VVIN=2.7VEfficiency vs.Output Current(Vout=4.2V)0102
17、030405060708090100101001000Output Current(mA)Efficiency(%)VIN=2VVIN=3VEfficiency vs.Output Current(Vout=5V)0102030405060708090100101001000Output Current(mA)Efficiency(%)VIN=2VVIN=3.6VLY9830http:/ 7to10 TEL:0755-82985079 FAX:0755-82985153 P Pi in n D De es sc cr ri ip pt ti io on nSW(Pin1):Switch Pin
18、.Connect inductor between SW and VIN.Keep these PCB trace lengths as short and wide as possible to reduce EMI and voltage overshoot.GND(Pin 2):Signal and Power Ground.Provide a short direct PCB path between GND and the()side of the output capacitor(s).FB(Pin 3):Feedback Input to the gm Error Amplifi
19、er.Connect resistor divider tap to this pin.The output voltage can be adjusted from 2.5V to 5V by:VOUT=1.212V 1+(R1/R2)EN(Pin 4):Logic Controlled Shutdown Input.EN=High:Normal free running operation,1.4MHz typical operating frequency.EN=Low:Shutdown,quiescent current 1A.Output capacitor can be compl
20、etely discharged through the load or feedback resistors.VOUT(Pin 5):Output Voltage Sense Input and Drain of the Internal Synchronous Rectifier MOSFET.Bias is derived from VOUT.PCB trace length from VOUT to the output filter capacitor(s)should be as short and wide as possible.VIN(Pin 6):Battery Input
21、 Voltage.The device gets its start-up bias from VIN.Once VOUT exceeds VIN,bias comes from VOUT.Thus,once started,operation is completely independent from VIN.Operation is only limited by the output power level and the batterys internal series resistance.LY9830http:/ 8to10 TEL:0755-82985079 FAX:0755-
22、82985153on the LY9830.To minimize radiated noise,The LY9830 can utilize small surface mount and chip ind A Ap pp pl li ic ca at ti io on ns s I In nf fo or rmma at ti io on n Inductor Selection uctors due to their fast 1.4MHz switching frequency.A minimum inductance value of 3.3uH is necessary for 3
23、.6V and lower voltage applications and 4.7uH for output voltages greater than 3.6V.Larger values by reducing the inductor ripple current.Increasing the inductance above 10uH will increase size while providing little improvement in output current capability.The inductor current ripple is typically se
24、t for 20%to 40%of the maximum inductor current(IP).High frequency ferrite core inductor materials reduce frequency dependent power losses compared to cheaper powdered iron types,improving efficiency.The inductor should have low ESR(series resistance of the windings)to reduce the I2R power losses,and
25、 must be able to handle the peak inductor current without saturating.Molded chokes and some chip inductors usually do not have enough core to support the peak inductor currents of 850mA seen use a toroid,pot core or shielded bobbin inductor.See Table 1 for some suggested components and suppliers.Out
26、put and Input Capacitor Selection Low ESR(equivalent series resistance)capacitors should be used to minimize the output voltage ripple.Multilayer ceramic capacitors are an excellent choice as they have extremely low ESR and are available in small footprints.A 4.7F to 15F output capacitor is sufficie
27、nt for most applications.Larger values up to 22F may be used to obtain extremely low output voltage ripple and improve transient response.An additional phase lead capacitor may be required with output capacitors larger than 10F to maintain acceptable phase margin.X5R and X7R dielectric materials are
28、 preferred for their ability to maintain capacitance over wide voltage and temperature ranges.Low ESR input capacitors reduce input switching noise and reduce the peak current drawn from the battery.It follows that ceramic capacitors are also a good choice for input decoupling and should be located
29、as close as possible to the device.A 10F input capacitor is sufficient for virtually any application.Larger values may be used without limitations.LY9830http:/ 9to10 TEL:0755-82985079 FAX:0755-82985153The high speed operation of the LY9830 demands carefu Table 1:Suggested Inductors PCB Layout Guidel
30、ines l attention to board layout.You will not get advertised performance with careless layout.A large ground pin copper area will help to lower the chip temperature.A multilayer board with a separate ground plane is ideal,but not absolutely necessary.Recommended component placement:traces carrying h
31、igh current are direct.Trace area at FB pin is small.Lead length to battery is short.Vendor Part Inductance(uH)MAM DCR(m)Height(mm)CDRH5D18-4R1 4.1 57 2.0 CDRH5D18-100 10 124 2.0 CDRH3D16-4R7 4.7 105 1.8 CDRH3D16-6R8 6.8 170 1.8 CR43-4R7 4.7 109 3.5 CR43-100 10 182 3.5 CMD4D06-4R7MC 4.7 216 0.8 Sumi
32、da(847)956-0666 CMD4D06-3R3MC 3.3 174 0.8 DS1608-472 4.7 60 2.9 DS1608-103 10 75 2.9 Coilcraft (847)639-6400 DS1608C-472 4.7 90 2.9 D52LC-4R7M 4.7 84 2.0 Toko(408)432-8282 D52LC-100M 10 137 2.0 Murata LQH3C4R7M24 4.7 195 2.2 LY9830http:/ 10to10 TEL:0755-82985079 FAX:0755-82985153 P Pa ac ck ka ag gi
33、 in ng g I In nf fo or rmma at ti io on n SOT-23-6L Surface Mount Package Dimensions In Millimeters Dimensions In Inches Symbol Min Max Min Max A 1.050 1.250 0.041 0.049 A1 0.000 0.100 0.000 0.004 A2 1.050 1.150 0.041 0.045 b 0.300 0.500 0.012 0.020 c 0.100 0.200 0.004 0.008 D 2.820 3.020 0.111 0.119 E 1.500 1.700 0.059 0.067 E1 2.650 2.950 0.104 0.116 e 0.950(BSC)0.037(BSC)e1 1.800 2.000 0.071 0.079 L 0.300 0.600 0.012 0.024 0 8 0 8 .LY9830