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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 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 ams1309 advanced monolithic systems http://www.ams-semitech.com 1
ams1309axx sot-23-3 sot-89-3 1 1 vss 3 2 vout 2 3 lx ams1309bxx sot-23-3 sot-89-3 1 1 vss 3 2 vout 2 3 ext AMS1309CXX sot-23-5 sot-89-5 4 5 vss 2 2 vout 5 4 lx 1 3 ce 3 1 nc ce vdd fb m3 sot-23-3l ams1309axx p sot-89-3l no no no m3 sot-23-3l ams1309bxx p sot-89-3l no no no m5 sot-23-5l AMS1309CXX p sot-89-5l yes no no m5 sot-23-5l ams1309dxx p sot-89-5l yes no no ams1309f m5 sot-23-5l n o ye s ye s package reference pin functions pin # pin # pin # symbol symbol symbol description description description ground ground ground on/off control input. power output power output power output switch switch null external inside inside outside outside outside transistor package part no. suffix feature standard external standard enable external enable external adjustable ams1309 advanced monolithic systems http://www.ams-semitech.com 2
ams1309dxx sot-23-5 sot-89-5 4 5 vss 2 2 vout 5 4 ext 1 3 ce 3 1 nc ams1309fxx sot-23-5 1 fb 2 vdd 3 nc 4 vss 5 ext v in 6.5 v v lx 6.5 v ext v ext -0.3~vout+0.3 v ce v ce -0.3~vout+0.3 v lx i lx 600 ma ext i ext 30 ma sot23 pd 300 mw sot89 pd 500 mw t opr -25~+85 t stg -40~+125 t solder 260 , 10s functional block diagram absolute maximum ratings ams1309 advanced monolithic systems http://www.ams-semitech.com 3 pin # pin # symbol symbol description description ground ground null null feedback power output external external on/off control input. power input parameter symbol units margin input voltage switch voltage operating temperature storage temperature soldering temperature and time power dissipation pin voltage pin voltage pin current pin current
v in =vout*0.6 v ss =0v i out =10ma t opt =25 fosc=180khz v out vout*0.975 vout vout*1.025 v v start i out =1ma v in 0 2v 0.8 0.9 v v hold i out =1ma v in 2 0v 0.45 v i dd1 1 vout=vout*0.95 50 a i dd2 2 vout=vout+0.5v 9 a i lx v lx =0.4v, vout=vout*0.95 360 ma i lxleak vout=v lx =6v 0.5 a f osc vout=set vout*0.95 180 khz maxdty on(v lx ?l?)side 84 % 85 % ams1309bxx/dxx fosc=180khz v out vout*0.975 vout vout*1.025 v v start i out =1ma v in 0 2v 0.8 0.9 v v hold i out =1ma v in 2 0v 0.45 v i dd1 1 vout=vout*0.95 80 a i dd2 2 vout=vout+0.5v 12 a i lx v lx =0.4v, vout=vout*0.95 360 ma i lxleak vout=v lx =6v 0.5 a f osc vout=set vout*0.95 180 khz maxdty on(v lx ?l?)side 84 % 85 % oscillator frequency maximum duty cycle efficiency ams1309 advanced monolithic systems http://www.ams-semitech.com 4 startup voltage output voltage hold voltage input current input current switch on current switch leak current output voltage startup voltage hold voltage input current input current switch on current switch leak current oscillator frequency maximum duty cycle efficiency symbol symbol parameters parameters condition condition min min typ typ max max units units units units no external component no external component unless otherwise noted. test condition: electrical characteristics
ams1309f33 v fb =3.3v , fosc=180khz vfb 3.22 3.30 3.38 v v start i out =1ma v in 0 2v 0.8 0.9 v v hold i out =1ma v in 2 0v 0.45 v i dd1 1 vout=vout*0.95 80 a i dd2 2 vout=vout+0.5v 10 a i lx v lx =0.4v, vout=vout*0.95 360 ma i lxleak vout=v lx =6v 0.5 a f osc vout=set vout*0.95 180 khz maxdty on(v lx ?l?)side 84 % 85 % 1 diode: ( 0.2v) in5817,in5819 2 33 h r<0.1 ? 100uf feedback voltage startup voltage hold voltage input current input current efficiency maximum duty cycle oscillation frequency switch leak current switch on current symbol parameters condition min typ max units schottky vf: , for example: inductor: capacitor: 3 step-up converter ams1309 advanced monolithic systems http://www.ams-semitech.com 5 no external component
typical application ams1309 advanced monolithic systems http://www.ams-semitech.com 6 33uh in5817 in5819 100uf/16v(tantalum capacitor) 2sd1628g 2sd3279 nmos aat9460 xp151 xp161 1k ? 2200pf r fb rfb1/rfb2=vout/vfb-1 (vout= ) r fb1 +r fb2 2m ? c fb l,c l . fzfb=1/(2 c fb r fb1 ) inductor : diode : transistor : base resistor : capacitor : base capacitor : output voltage adjust
me2108a33 output voltage vs output current efficiency vs output current typical performance characteristics ams1309 advanced monolithic systems http://www.ams-semitech.com 7
input current(no load) vs output voltage quiescent current vs input current ams1309 advanced monolithic systems http://www.ams-semitech.com 8
input current 1 vs output voltage input current 2 vs output voltage ams1309 advanced monolithic systems http://www.ams-semitech.com 9
duty circle vs output voltage maximum oscillation frequency vs output voltage ams1309 advanced monolithic systems http://www.ams-semitech.com 10
package ams1309 advanced monolithic systems http://www.ams-semitech.com 11

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