rev. 1. 3 fs 1117 - ds - 1 3 _en jan 20 1 1 datasheet fs 1117 1.0 a adjustable & fixed voltage ldo l inear regulator fortune' properties for reference only
fs 1117 rev. 1.3 2/9 fortune semiconductor corporation ???? 28f., no.27, sec. 2, zhongzheng e. rd., danshui dist., new taipei city 251, taiwan tel. 886 - 2 - 28094742 fax 886 - 2 - 28094874 www.ic-fortune.com this manual contains new product information. fortune semiconductor corporation reserves the rights to modify the product specification without further notice. no liability is assumed by fortune semiconductor corporation as a result of the use of this product. no rights under any patent accompany the sale of the product. fortune' properties for reference only
fs 1117 rev. 1.3 3/9 1. general description the FS1117 is a series of low-dropout three-terminal regulators with a dropout of 1.4v at 1a output current. the FS1117 series provides current limiting and thermal shutdown. its circuit includes a trimmed bandgap reference to assure output voltage accuracy to be within 2% for 1.8v, 3.3v and adjustable versions. c urrent limit is trimmed to ensure specified output current and controlled short - circuit current. o n C chip thermal shutdown provides protection against any combination of overload and ambient temperature that would create excessive junction temperature. the FS1117 has an adjustable version that can provide the output voltage from 1.25v to 12v with only two external resistors. the FS1117 series is available in the industry standard sot223 power package. 2. features ? 1.4v maximum dropout at full load current ? fast transient response ? output current limiting ? built-in thermal shutdown ? good noise rejection ? low esr ceramic capacitor(mlcc) required gor stability 3. applications ? pc motherboard ? lcd monitor ? graphic card ? dvd-video player ? nic/switch ? telecom equipment ? adsl modem ? printer and other peripheral equipment 4. ordering information 5. pin configurations 1 2 3 sot - 223 FS1117 xx x xxxxx part no. pin 1 pin 2 pin 3 FS1117 - xx g j gnd /adj out (tap) in FS1117 - xx x x package pin out j ? sot - 223 1.gnd 2.out 3.in note : for the adjustable voltage types , the gnd pin is replace d with the adj pin p ackage type g : g stands for green - package output vol tage 12 : 1.2v 18 : 1 . 8 v 25 : 2 . 5 v 33 : 3.3v 50 : 5.0 vr : adjustable output note: the o utput voltages other than the preset values are available by order only. fortune' properties for reference only
fs 1117 rev. 1.3 4/9 6. package marking information 7. pin description part no. symbol description fs 1117 - xxg j gnd /adj ground pin or a djust terminal pin. in r egulator input pin . out r egulator output pin. ex fs 1117 - 33 g j xxxx date code ex fs 1117 - g j adj type xxxx date code FS1117 33 g j xxxx fs 1117 g j xxxx fortune' properties for reference only
fs 1117 rev. 1.3 5/9 8. typical application circuit 9. function al block diagrams f s 1 1 1 7 v i n v o u t g n d v o u t v i n + - - + 1 0 ? f 2 2 ? f f s 1 1 1 7 v i n v o u t a d j v o u t v i n + - - + 1 0 ? f 2 2 ? f r 1 r 2 v o u t = v r e f * ( 1 + r 2 / r 1 ) v r e f = 1 . 2 5 v 3 2 + - t h e r m a l p r o t r c t i o n + - + - + - i n p u t o u t p u t g n d a 1 a 2 b 1 f o r a d i u s t a b l e o u t p u t , d i s c o n n e c t a 1 a n d a 2 , c o n n e n t b f o r f i x e d o u t p u t , c o n n e c t a 1 a n d a 2 , d i s c o n n e c t b fortune' properties for reference only
fs 1117 rev. 1.3 6/9 10. absolute maximum ratings symbol parameter rating unit vin input voltage 23 v t j maximum junction temperature 150 t s storage t emperature - 65~150 t lead lead temperature(10sec) 300 * stresses greater than those listed under absolute maximum ratings may cause permanent damage to the device. these are stress rating only, and functional operation of the device at these or any other conditions beyond those indicated under recommended operating conditions is not implied. exposure to absolute maximum ratings for extended periods may affect device reliability. 11. recommended operating conditions symbol parameter rating unit vin input voltage 18 v t j operating junction temperature range - 20~12 5 12. electrical characteristics (cin=10f, cout= 22 f, ta=25 , unless otherwise noted.) symbol parameter test c onditions min typ max u nit v ref reference voltage FS1117 - adj io=10ma, vin - vout=1.5v 1.225 1.250 1.275 v io=10ma, 1.5v Q vin - vout Q 8v 1.225 1.250 1.275 v vout output voltage FS1117 - 1.8v io=10ma, 3.3v Q vin Q 10v 1.764 1.8 1.836 v FS1117 - 3.3v io=10ma, 4.8v Q vin Q 10v 3.235 3.3 3.365 v ilimit current limit FS1117 - xxx vin - vout=3v 1.1 a iq ground pin current FS1117 - xxx vin=vout+1.25v 5 10 m a ia dj adj pin current FS1117 - ad io=10ma~1a,1.5v Q vin - vout Q 10v 60 120 a vdrop dropout voltage FS1117 - xxx iout= 1 a , vout=1%vout 1.4 1.5 v ? vline line regulation FS1117 - xxx iout=10ma,1.5v Q vin - vout Q 10v 0. 1 0.5 % ? vload load regulation FS1117 - 1.8v vin=3.3v, 10ma io 1a 15 18 mv FS1117 - 3.3v vin=5v, 10ma io 1a 26 33 mv en output noise FS1117 - xxx f=1 0 hz to 10khz, 0.003 % psrr ripple rejection FS1117 - xxx f=1 20 hz, cout= 25 f tantalum, vin - vout=3v 60 db tsd thermal shutdown temperature FS1117 - xxx juncti on temperature 15 0 c thys thermal shutdown hysteresis FS1117 - xxx 2 5 c ja thermal resistance ( no heat - sink, no air flow) FS1117 - xxx sot - 223 1 17 c /w fortune' properties for reference only
fs 1117 rev. 1.3 7/9 13. typical operating characteristics (FS1117-3.3v cin= 10 f, cout= 22 f, ta=+25 , unless otherwise noted.) output voltage vs. input voltage 0.0 1.0 2.0 3.0 4.0 0 2 4 6 8 10 12 input voltage(v) output voltage(v) ground pin current vs. ambient temperature 0.00 1.00 2.00 3.00 4.00 5.00 6.00 -50 -30 -10 10 30 50 70 90 110 130 150 ambient temperature ( : ) ground pin current (ua) ground pin current vs. load current 3.0 3.5 4.0 4.5 5.0 0 200 400 600 800 1000 1200 load current (ma) ground pin current (ua) output voltage vs. input voltage 0.0 1.0 2.0 3.0 4.0 0 2 4 6 8 10 12 input voltage(v) output voltage(v) fortune' properties for reference only
fs 1117 rev. 1.3 8/9 14. application description the FS1117 keeps a constant 1.25v between the output pin and the adjust pin. by placing a resister r1 across these two pins a constant current flows through r1,assign to the ladj current and into the r2 resister producing a voltage equal to the (1.25/r1)*r2+ladj*r2 which will be added to the 1.25v to set the output voltage. this is summarized in the above equation. since the minimum load current requirement of be FS1117 is 10ma, r1 is typic ally selected to be 121 resistor so that it automatically satisfies the minimum current requirement . notice that since ladj is typically in the range and should only be considered when a very precise output voltage setting is required. for example, in a typical 3.3v application where r1=121 and r220 the error due to ladj is only 0.3% of the nominal set point. stability the FS1117 requires the use of an output capacitor as part of the frequency compensation in order to make the regulator stable. for most applications a minimum of 10 f aluminum electrolytic capacitor insures both stability and good transient response. thermal design the FS1117 incorporates an internal thermal shutdown that protects the device when the junction temperature exceeds the maximum allowable junction temperature. although this device can operate with junction temperatures in the range of 150 , it is recommended that the selected heat sink be chosen such that during maximum continuous load operation the junction temperature is kept below the temperature. pd=vout iout t j =ta+pd j a < 150 layout consideration the output capacitors must be located as close to the vout terminal of the device as possible. it is recommended to use a section of a layer of the pc board as a plane to connect the vout pin to the output capacitors that may result due to excessive trace inductance. fortune' properties for reference only
fs 1117 rev. 1.3 9/9 15. package outline sot- 223 16. revision history version date page description 1.0 2009/06/24 all new release 1.1 2010/09/20 6 add vref test c onditions io= 10ma, vin - vout=1.5v 1.2 2010/10 / 2 0 6 revise vref test c onditions io=10ma, 1.5v Q vin - vout Q 8v 1. 3 201 1 / 0 1/ 31 3 add output 1.2v, 2.5 , 5 . 0 v fortune' properties for reference only
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