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fremont micro devices FT531xx www.fremontmicro.com page 1 of 23 ds531-a8 ultra low noise, high psrr, 250ma ldo features description ? ultra-low noise for rf application ? ultra-fast response in line/load transient ? quick start-up (typically 100us) ? low quiescent current: 36ua ? less than 0.1ua standby current when shutdown ? low dropout voltage: 120mv @ 100ma ? wide operating voltage ranges : 2.5v to 6v ? ttl-logic-controlled shutdown input ? low temperature coefficient ? current limiting protection ? only 1uf output capacitor required ? high power supply rejection ratio ? rohs compliant and 100% lead (pb)-free ? custom voltage available ? custom options for ce logic and build-in pull-up/down available the FT531xx is designed for portable rf and wireless applications with demanding performance and space requirements. the FT531xx performance is optimized for battery powered systems to deliver ultra low noise and low quiescent current. regulator ground current increases only slightly in dropout, further prolonging the battery life. the FT531xx also works with low-esr ceramic capacitors, reducing the amount of board space necessary for power applications, critical in hand-held wireless devices. the FT531xx consumes less than 0.1ua in shutdown mode and has fast turn-on time less than 100us. the other features include low dropout voltage, high output accuracy, current limiting protection, and high ripple rejection ratio. the FT531xx is available in the 5-lead of sot-23-5(l) , sc-70 and the 3-lead of sot-23-3(l), sot-89-3(l), sot-23 packages. appllications ? cdma/gsm cellular handsets ? battery-powered equipment ? laptop, palmtops, notebook computers ? hand-held instruments ? pcmcia cards ? portable information appliances
fremont micro devices FT531xx www.fremontmicro.com page 2 of 23 ds531-a8 typical application circuit typical application circuit absolute maximum ratings ? supply input voltage --------------------------------------------------------------------------------------- 6v ? power dissipation, pd@ ta=27 sot-23-5(l) ----------------------------------------------------------------------------------------------- 400mw sot-23-3(l) ----------------------------------------------------------------------------------------------- 400mw sot-89-3(l) ----------------------------------------------------------------------------------------------- 600mw sc-70 ---------------------------------------------------------------------------------------------------- 300mw sot-23 --------------------------------------------------------------------------------------------------- 250mw package thermal resistance sot-23-5(l)------------------------------------------------------------------------------------------------ 250 /w sot-23-3(l)------------------------------------------------------------------------------------------------ 250 /w sot-89-3(l)------------------------------------------------------------------------------------------------ 170 /w sc-70 ------------------------------------------------------------------------------------------------------- 330 /w sot-23 ----------------------------------------------------------------------------------------------------- 380 /w lead temperature (soldering, 10sec.) ----------------------------------------------------------------- 260 storage temperature range ------------------------------------------------------------------------- 60 to 150 ? esd susceptibility hbm(human body mode) -------------------------------------------------------------------------------4kv mm(machine mode) --------------------------------------------------------------------------------------200v * stresses exceed those listed under ?absolute maximum ratings? may cause permanent damage to the device. functional operation of the device at condi tions beyond those listed in the specification is not guaranteed. prolonged exposure to extreme conditions may affect device reliability or functionality.
fremont micro devices FT531xx www.fremontmicro.com page 3 of 23 ds531-a8 pin configuration terminal function pin name pin function en chip enable (active high). no pull-down resistor build-in for package sot-23-3(l) ,sot-89-3(l) and sot-23 the en is internally connected to vin vin power input voltage vout output voltage nc no connection gnd ground
fremont micro devices FT531xx www.fremontmicro.com page 4 of 23 ds531-a8 ordering information FT531 ? designator symbol output voltage a 1.2v b 1.3v c 1.5v d 1.8v e 2.5v f 2.7v g 2.8v h 2.85v i 3.0v j 3.3v k 3.6v l 4.2v designator symbol pin configuration package type a sot-23-5a b sot-23-5b c sot-23-5c sot-23-5(l) d sc-70a e sc-70b f sc-70c sc-70 / sot-353 g sot-23-3a sot-23-3(l) h sot-23a sot-23 i sot-89-3a sot-89-3(l)
fremont micro devices FT531xx www.fremontmicro.com page 5 of 23 ds531-a8 marking rule c represent product series symbol product series 6 FT531xx d represent output voltage and operating temperature range g represent the output voltage is 2.8v, operating temperature is ?40 ~ 85 . ?? for internal reference . block diagram block diagram
fremont micro devices FT531xx www.fremontmicro.com page 6 of 23 ds531-a8 electrical characteristics vout=1.2v; en=vin=2.5v; cout= 1 uf unless otherwise noted parameter symbol conditions min typ max units output voltage accuracy vout iout=1ma -2 --- +2 % imax vin=2.5v 250 300 --- ma current limiter ishort vin=2.5v --- 20 --- ma line regulations vline 2.5v~6v --- 0.01 0.3 %/v load regulation vload 1ma iout 100ma --- 10 --- mv dropout voltage vdrop iout=100ma --- 400 --- mv supply current iq vin=2.5v,iout=0ma --- 36 --- ua standby current istby shut down --- 0.01 1 ua temperature coefficient vout/ ( temp* vo u t ) iout=30ma -40c temp 85c --- 100 --- ppm/ output noise voltage e no 10hz~100khz --- 30 --- uvrms psrr@1k --- 72 --- ripple rejection rate psrr@10k vin=2.5vdc+1vp-pac, iout=30ma --- 60 --- db en input bias current ien --- 0 100 na vl --- --- --- 0.3 v en threshold vh --- 1.2 --- 6 v * dropout voltage is defined as the input to output differential at which the output voltage drops 2% below its nominal value measured at 1v differential.
fremont micro devices FT531xx www.fremontmicro.com page 7 of 23 ds531-a8 vout=1.3v; en=vin=(vout+1)v; cout=1uf unless otherwise noted parameter symbol conditions min typ max units output voltage accuracy vout iout=1ma -2 --- +2 % imax vin=vout+1v 250 300 --- ma current limiter ishort vin=vout+1v --- 20 --- ma line regulations vline (vout+1.0v)~6v --- 0.01 0.3 %/v load regulation vload 1ma iout 100ma --- 10 --- mv dropout voltage vdrop iout=100ma --- 380 --- mv supply current iq vin=(vout+1)v,iout=0ma --- 36 --- ua standby current istby shut down --- 0.01 1 ua temperature coefficient vout/ ( temp* vo u t ) iout=30ma -40c temp 85c --- 100 --- ppm/ output noise voltage e no 10hz~100khz --- 30 --- uvrms psrr@1k --- 72 --- ripple rejection rate psrr@10k vin=vout+1vdc+1vp-pac iout=30ma --- 60 --- db en input bias current ien --- 0 100 na vl --- --- --- 0.3 v en threshold vh --- 1.2 --- 6 v * dropout voltage is defined as the input to output differential at which the output voltage drops 2% below its nominal value measured at 1v differential.
fremont micro devices FT531xx www.fremontmicro.com page 8 of 23 ds531-a8 vout=1.5v; en=vin=(vout+1)v; cout=1uf unless otherwise noted parameter symbol conditions min typ max units output voltage accuracy vout iout=1ma -2 --- +2 % imax vin=vout+1v 250 300 --- ma current limiter ishort vin=vout+1v --- 20 --- ma line regulations vline (vout+1.0v)~6v --- 0.01 0.3 %/v load regulation vload 1ma iout 100ma --- 10 --- mv dropout voltage vdrop iout=100ma --- 300 --- mv supply current iq vin=(vout+1)v,iout=0ma --- 36 --- ua standby current istby shut down --- 0.01 1 ua temperature coefficient vout/ ( temp* vo u t ) iout=30ma -40c temp 85c --- 100 --- ppm/ output noise voltage e no 10hz~100khz --- 30 --- uvrms psrr@1k --- 72 --- ripple rejection rate psrr@10k vin=vout+1vdc+1vp-pac iout=30ma --- 60 --- db en input bias current ien --- 0 100 na vl --- --- --- 0.3 v en threshold vh --- 1.2 --- 6 v * dropout voltage is defined as the input to output differential at which the output voltage drops 2% below its nominal value measured at 1v differential.
fremont micro devices FT531xx www.fremontmicro.com page 9 of 23 ds531-a8 vout=1.8v; en=vin=(vout+1)v; cout=1uf unless otherwise noted parameter symbol conditions min typ max units output voltage accuracy vout iout=1ma -2 --- +2 % imax vin=vout+1v 250 300 --- ma current limiter ishort vin=vout+1v --- 20 --- ma line regulations vline (vout+1.0v)~6v --- 0.01 0.3 %/v load regulation vload 1ma iout 100ma --- 10 --- mv dropout voltage vdrop iout=100ma --- 200 --- mv supply current iq vin=(vout+1)v,iout=0ma --- 36 --- ua standby current istby shut down --- 0.01 1 ua temperature coefficient vout/ ( temp* vo u t ) iout=30ma -40c temp 85c --- 100 --- ppm/ output noise voltage e no 10hz~100khz --- 30 --- uvrms psrr@1k --- 72 --- ripple rejection rate psrr@10k vin=vout+1vdc+1vp-pac iout=30ma --- 60 --- db en input bias current ien --- 0 100 na vl --- --- --- 0.3 v en threshold vh --- 1.2 --- 6 v * dropout voltage is defined as the input to output differential at which the output voltage drops 2% below its nominal value measured at 1v differential.
fremont micro devices FT531xx www.fremontmicro.com page 10 of 23 ds531-a8 vout=2.5v; en=vin=(vout+1)v; cout=1uf unless otherwise noted parameter symbol conditions min typ max units output voltage accuracy vout iout=1ma -2 --- +2 % imax vin=vout+1v 250 300 --- ma current limiter ishort vin=vout+1v --- 20 --- ma line regulations vline (vout+1.0v)~6v --- 0.01 0.3 %/v load regulation vload 1ma iout 100ma --- 10 --- mv dropout voltage vdrop iout=100ma --- 140 --- mv supply current iq vin=(vout+1)v,iout=0ma --- 36 --- ua standby current istby shut down --- 0.01 1 ua temperature coefficient vout/ ( temp* vo u t ) iout=30ma -40c temp 85c --- 100 --- ppm/ output noise voltage e no 10hz~100khz --- 40 --- uvrms psrr@1k --- 72 --- ripple rejection rate psrr@10k vin=vout+1vdc+1vp-pac iout=30ma --- 60 --- db en input bias current ien --- 0 100 na vl --- --- --- 0.3 v en threshold vh --- 1.2 --- 6 v * dropout voltage is defined as the input to output differential at which the output voltage drops 2% below its nominal value measured at 1v differential.
fremont micro devices FT531xx www.fremontmicro.com page 11 of 23 ds531-a8 vout=2.7v; en=vin=(vout+1)v; cout=1uf unless otherwise noted parameter symbol conditions min typ max units output voltage accuracy vout iout=1ma -2 --- +2 % imax vin=vout+1v 250 300 --- ma current limiter ishort vin=vout+1v --- 20 --- ma line regulations vline (vout+1.0v)~6v --- 0.01 0.3 %/v load regulation vload 1ma iout 100ma --- 10 --- mv dropout voltage vdrop iout=100ma --- 130 --- mv supply current iq vin=(vout+1)v,iout=0ma --- 36 --- ua standby current istby shut down --- 0.01 1 ua temperature coefficient vout/ ( temp* vo u t ) iout=30ma -40c temp 85c --- 100 --- ppm/ output noise voltage e no 10hz~100khz --- 40 --- uvrms psrr@1k --- 72 --- ripple rejection rate psrr@10k vin=vout+1vdc+1vp-pac iout=30ma --- 60 --- db en input bias current ien --- 0 100 na vl --- --- --- 0.3 v en threshold vh --- 1.2 --- 6 v * dropout voltage is defined as the input to output differential at which the output voltage drops 2% below its nominal value measured at 1v differential.
fremont micro devices FT531xx www.fremontmicro.com page 12 of 23 ds531-a8 vout=2.8v; en=vin=(vout+1)v; cout=1uf unless otherwise noted parameter symbol conditions min typ max units output voltage accuracy vout iout=1ma -2 --- +2 % imax vin=vout+1v 250 300 --- ma current limiter ishort vin=vout+1v --- 20 --- ma line regulations vline (vout+1.0v)~6v --- 0.01 0.3 %/v load regulation vload 1ma iout 100ma --- 10 --- mv dropout voltage vdrop iout=100ma --- 120 --- mv supply current iq vin=(vout+1)v,iout=0ma --- 36 --- ua standby current istby shut down --- 0.01 1 ua temperature coefficient vout/ ( temp* vo u t ) iout=30ma -40c temp 85c --- 100 --- ppm/ output noise voltage e no 10hz~100khz --- 40 --- uvrms psrr@1k --- 72 --- ripple rejection rate psrr@10k vin=vout+1vdc+1vp-pac iout=30ma --- 60 --- db en input bias current ien --- 0 100 na vl --- --- --- 0.3 v en threshold vh --- 1.2 --- 6 v * dropout voltage is defined as the input to output differential at which the output voltage drops 2% below its nominal value measured at 1v differential.
fremont micro devices FT531xx www.fremontmicro.com page 13 of 23 ds531-a8 vout=2.85v; en=vin=(vout+1)v; cout=1uf unless otherwise noted parameter symbol conditions min typ max units output voltage accuracy vout iout=1ma -2 --- +2 % imax vin=vout+1v 250 300 --- ma current limiter ishort vin=vout+1v --- 20 --- ma line regulations vline (vout+1.0v)~6v --- 0.01 0.3 %/v load regulation vload 1ma iout 100ma --- 10 --- mv dropout voltage vdrop iout=100ma --- 120 --- mv supply current iq vin=(vout+1)v,iout=0ma --- 36 --- ua standby current istby shut down --- 0.01 1 ua temperature coefficient vout/ ( temp* vo u t ) iout=30ma -40c temp 85c --- 100 --- ppm/ output noise voltage e no 10hz~100khz --- 40 --- uvrms psrr@1k --- 72 --- ripple rejection rate psrr@10k vin=vout+1vdc+1vp-pac iout=30ma --- 60 --- db en input bias current ien --- 0 100 na vl --- --- --- 0.3 v en threshold vh --- 1.2 --- 6 v * dropout voltage is defined as the input to output differential at which the output voltage drops 2% below its nominal value measured at 1v differential.
fremont micro devices FT531xx www.fremontmicro.com page 14 of 23 ds531-a8 vout=3.0v; en=vin=(vout+1)v; cout=1uf unless otherwise noted parameter symbol conditions min typ max units output voltage accuracy vout iout=1ma -2 --- +2 % imax vin=vout+1v 250 300 --- ma current limiter ishort vin=vout+1v --- 20 --- ma line regulations vline (vout+1.0v)~6v --- 0.01 0.3 %/v load regulation vload 1ma iout 100ma --- 10 --- mv dropout voltage vdrop iout=100ma --- 120 --- mv supply current iq vin=(vout+1)v,iout=0ma --- 36 --- ua standby current istby shut down --- 0.01 1 ua temperature coefficient vout/ ( temp* vo u t ) iout=30ma -40c temp 85c --- 100 --- ppm/ output noise voltage e no 10hz~100khz --- 40 --- uvrms psrr@1k --- 72 --- ripple rejection rate psrr@10k vin=vout+1vdc+1vp-pac iout=30ma --- 60 --- db en input bias current ien --- 0 100 na vl --- --- --- 0.3 v en threshold vh --- 1.2 --- 6 v * dropout voltage is defined as the input to output differential at which the output voltage drops 2% below its nominal value measured at 1v differential.
fremont micro devices FT531xx www.fremontmicro.com page 15 of 23 ds531-a8 vout=3.3v; en=vin=(vout+1)v; cout=1uf unless otherwise noted parameter symbol conditions min typ max units output voltage accuracy vout iout=1ma -2 --- +2 % imax vin=vout+1v 250 300 --- ma current limiter ishort vin=vout+1v --- 20 --- ma line regulations vline (vout+1.0v)~6v --- 0.01 0.3 %/v load regulation vload 1ma iout 100ma --- 10 --- mv dropout voltage vdrop iout=100ma --- 120 --- mv supply current iq vin=(vout+1)v,iout=0ma --- 36 --- ua standby current istby shut down --- 0.01 1 ua temperature coefficient vout/ ( temp* vo u t ) iout=30ma -40c temp 85c --- 100 --- ppm/ output noise voltage e no 10hz~100khz --- 40 --- uvrms psrr@1k --- 72 --- ripple rejection rate psrr@10k vin=vout+1vdc+1vp-pac iout=30ma --- 60 --- db en input bias current ien --- 0 100 na vl --- --- --- 0.3 v en threshold vh --- 1.2 --- 6 v * dropout voltage is defined as the input to output differential at which the output voltage drops 2% below its nominal value measured at 1v differential.
fremont micro devices FT531xx www.fremontmicro.com page 16 of 23 ds531-a8 vout=3.6v; en=vin=(vout+1)v; cout=1uf unless otherwise noted parameter symbol conditions min typ max units output voltage accuracy vout iout=1ma -2 --- +2 % imax vin=vout+1v 250 300 --- ma current limiter ishort vin=vout+1v --- 20 --- ma line regulations vline (vout+1.0v)~6v --- 0.01 0.3 %/v load regulation vload 1ma iout 100ma --- 10 --- mv dropout voltage vdrop iout=100ma --- 120 --- mv supply current iq vin=(vout+1)v,iout=0ma --- 36 --- ua standby current istby shut down --- 0.01 1 ua temperature coefficient vout/ ( temp* vo u t ) iout=30ma -40c temp 85c --- 100 --- ppm/ output noise voltage e no 10hz~100khz --- 40 --- uvrms psrr@1k --- 72 --- ripple rejection rate psrr@10k vin=vout+1vdc+1vp-pac iout=30ma --- 60 --- db en input bias current ien --- 0 100 na vl --- --- --- 0.3 v en threshold vh --- 1.2 --- 6 v * dropout voltage is defined as the input to output differential at which the output voltage drops 2% below its nominal value measured at 1v differential.
fremont micro devices FT531xx www.fremontmicro.com page 17 of 23 ds531-a8 typical performance characteristics FT531i vin=4.0v, vout=3.0v, co=1uf, temp=27 unless otherwise noted quiescent current vs. temp 20 25 30 35 40 45 50 -40 -20 0 20 40 60 80 100 temp(c) quiescent current (ua) psrr -80 -70 -60 -50 -40 -30 -20 -10 0 0.01 0.1 1 10 100 1000 frequency(khz) p s r r ( d b 2 0 ) 0ma 1ma 10ma 30ma
fremont micro devices FT531xx www.fremontmicro.com page 18 of 23 ds531-a8
fremont micro devices FT531xx www.fremontmicro.com page 19 of 23 ds531-a8 pakaging information sot-23-5l
fremont micro devices FT531xx www.fremontmicro.com page 20 of 23 ds531-a8 sot-23-3l
fremont micro devices FT531xx www.fremontmicro.com page 21 of 23 ds531-a8 sot-89-3l
fremont micro devices FT531xx www.fremontmicro.com page 22 of 23 ds531-a8 sc-70
fremont micro devices FT531xx www.fremontmicro.com page 23 of 23 ds531-a8 sot-23

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