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AT1305 preliminary product information pfm step-up dc/dc converter with ldo 7f, no.9,park avenue. ii, science-based indu strial park, hsinchu 300,taiwan, r.o.c. tel: 886-3-563-0878 fax: 886-3-563-0879 www: http://www.aimtron.com.tw 2/8/2006 rev:1.1 email: service@aimtron.com.tw 1 features ? 0.8v low start-up input voltage ? up to 90%efficiency ? adjustable 100ma output with 1 alkaline cell or 200ma output with 2 alkaline cell battery input. ? 1.8v/3.0v/3.3v/300ma output with usb power input. ? small number of external components needed ? load disconnects from input in shutdown ? power good output ? 32 a quiescent(switch off) supply current ? 1 a shutdown mode supply current ? 8-pin tssop package applications ? mp3 ? power source for battery-powered equipment ? power source for cameras, camcorders, vcrs, pdas, electronic data banks, and hand-held communication equipment general description the AT1305 is a pfm step-up dc/dc converter with ldo for applications using 1 cell or 2 cell alkaline battery and usb applications. besides, the 32 a low quiescent current together with high efficiency maintains long battery life time. it p rovides a constant output voltage for inputs that vary above and below the output voltage. block dia g ram aimtron reserves the right without notice to change this circuitry and specifications.
AT1305 preliminary product information pfm step-up dc/dc converter with ldo 7f, no.9,park avenue. ii, science-based indu strial park, hsinchu 300,taiwan, r.o.c. tel: 886-3-563-0878 fax: 886-3-563-0879 www: http://www.aimtron.com.tw 2/8/2006 rev:1.1 email: service@aimtron.com.tw 2 pin configuration ordering information part number package remarks AT1305 8-pin plastic tssop date code AT1305_gre 8-pin plastic tssop, green ,date code with one bottom line AT1305 a 8-pin plastic tssop date code AT1305 a_gre 8-pin plastic tssop, green ,date code with one bottom line AT1305 b 8-pin plastic tssop date code AT1305 b_gre 8-pin plastic tssop, green ,date code with one bottom line AT1305 :ldo set to 3.3v AT1305ap :ldo set to 3.0v AT1305bp :ldo set to 1.8v * for more marking information, contact our sales representative directly pin description pin no. symbol i/o description 1 lx o switching output 2 en i enable control input, active high 3 /enpb i enable control input, active low 4 gnd - ground 5 pg o power good detected 6 fb i step-up converter feedback input 7 out o output 8 vdd - power input
AT1305 preliminary product information pfm step-up dc/dc converter with ldo 7f, no.9,park avenue. ii, science-based indu strial park, hsinchu 300,taiwan, r.o.c. tel: 886-3-563-0878 fax: 886-3-563-0879 www: http://www.aimtron.com.tw 2/8/2006 rev:1.1 email: service@aimtron.com.tw 3 absolute maximum ratings*1 (t a =+25 0 c) rated value parameter symbol condition min. max. unit power supply voltage v dd ? ? 6.0 v lx pin voltage v lx ? ? 6.0 v out output voltage v out ? ? 6.0 v other i/o pin voltage ? ? 6.0 v lx pin output current i lx ? ? 2 a ldo output peak current i ldo ? ? 400 ma allowable dissipation p d tssop8 ? 500 mw operating temperature t op ? -30 +85 0 c storage temperature t stg ? -55 +165 0 c 1. stresses beyond those listed under ?absolute maxi mum ratings? may cause permanent damage to the device. these are stress ratings only , and functional operation of th e device at these or any other conditions beyond those indicated in th e operational sections of the specifications is not implied. exposure to absolute maximum rating conditions for extended periods may affect device reliability . electrical characteristics (v in =1.0v, v out =2.8v, i out =0ma ,ta=+25 0 c) values parameter symbol condition min. typ. max. unit start-up voltage v st i out =1ma 0.7 0.8 - v power on reset threshold v dd - 2 - v AT1305,AT1305a 2.0 - 5.5 v operating v dd range v dd AT1305b 1.65 5.5 v no-load input current i in1 i out =0ma - 87 - a switch- off input current i in2 v in =5v - 32 50 a shutdown current i in3 en=0v, /enpb=high - 1 10 a feedback reference v fb close loop v dd =2.85v 1.176 1.2 1.224 v fb input current i fb v fb =1.2v - - 50 na lx switch on-time f s v out =2.85v - 1.75 - s
AT1305 preliminary product information pfm step-up dc/dc converter with ldo 7f, no.9,park avenue. ii, science-based indu strial park, hsinchu 300,taiwan, r.o.c. tel: 886-3-563-0878 fax: 886-3-563-0879 www: http://www.aimtron.com.tw 2/8/2006 rev:1.1 email: service@aimtron.com.tw 4 maximum duty d max v out =2.85v - 85 - % lx on resistance r lx n-channel - 0.3 - ? lx leakage current i l v lx =1.5v, en=0v,/enpb=vdd - 1 a current limit setting i lx v dd =2.85v - 1.5 2 a ldo current limit i ldo v dd =3.2v - 350 - ma out on resistance r out v dd =2.85v, i out =100ma - 0.5 - ? ldo enable threshold v dd1 out regulated to 1.8/3.0/3.3v - 4.0 - v ldo line regulation v in =4.5v~5.5v, i out =100ma - 1 - % ldo load regulation v out =3.3v, i out =10~100ma - 1 - % AT1305,AT1305a, vdd falling - 2.7 - v pg threshold v dd2 AT1305b, vdd falling - 1.65 - v pg sink current i pg i pg =1ma - 0.4 - v pg leakage current i lpg v dd =3v - - 1 a v ih 0.8 - - v en,/enpb trip level v il - - 0.5 v note 1 : once the output is in regulation , the AT1305/a/b operate down to a 0.7v input voltage.
AT1305 preliminary product information pfm step-up dc/dc converter with ldo 7f, no.9,park avenue. ii, science-based indu strial park, hsinchu 300,taiwan, r.o.c. tel: 886-3-563-0878 fax: 886-3-563-0879 www: http://www.aimtron.com.tw 2/8/2006 rev:1.1 email: service@aimtron.com.tw 5 typical operating charateristics boost converter line transien t response boost converter line transient response boost converter load transient response boost converter load transient response
AT1305 preliminary product information pfm step-up dc/dc converter with ldo 7f, no.9,park avenue. ii, science-based indu strial park, hsinchu 300,taiwan, r.o.c. tel: 886-3-563-0878 fax: 886-3-563-0879 www: http://www.aimtron.com.tw 2/8/2006 rev:1.1 email: service@aimtron.com.tw 6 ldo line transient response ldo load transient response boost converter start-up after enable
AT1305 preliminary product information pfm step-up dc/dc converter with ldo 7f, no.9,park avenue. ii, science-based indu strial park, hsinchu 300,taiwan, r.o.c. tel: 886-3-563-0878 fax: 886-3-563-0879 www: http://www.aimtron.com.tw 2/8/2006 rev:1.1 email: service@aimtron.com.tw 7 typical application circuit 1cell and usb power input 1cell or usb power input
AT1305 preliminary product information pfm step-up dc/dc converter with ldo 7f, no.9,park avenue. ii, science-based indu strial park, hsinchu 300,taiwan, r.o.c. tel: 886-3-563-0878 fax: 886-3-563-0879 www: http://www.aimtron.com.tw 2/8/2006 rev:1.1 email: service@aimtron.com.tw 8 typical operating charateristics 1cell and usb power input vin(v) 0 85 1.0 1.1 1.3 1.4 efficiency (load at ldo output) 80 75 70 90 l=33uh v dd =2.91v iout=100ma 1.2 0.9 1.5
AT1305 preliminary product information pfm step-up dc/dc converter with ldo 7f, no.9,park avenue. ii, science-based indu strial park, hsinchu 300,taiwan, r.o.c. tel: 886-3-563-0878 fax: 886-3-563-0879 www: http://www.aimtron.com.tw 2/8/2006 rev:1.1 email: service@aimtron.com.tw 9 2cell and usb power input vin(v) 0 90 2.2 2.6 2.8 3.0 efficiency (load at ldo output) 85 80 75 95 l=33uh vdd=3.3v iout=100ma 2.4 2.0 1.8
AT1305 preliminary product information pfm step-up dc/dc converter with ldo 7f, no.9,park avenue. ii, science-based indu strial park, hsinchu 300,taiwan, r.o.c. tel: 886-3-563-0878 fax: 886-3-563-0879 www: http://www.aimtron.com.tw 2/8/2006 rev:1.1 email: service@aimtron.com.tw 10 function description boost converter the AT1305 integrates a step-up, switc h-mode dc/dc converter with a linear regulator to provide step up/down voltage conversion. a pulse frequency modulation (pfm) with a constant on time 4.5us and minimum off-time 1.4 s controls the n-channel mosfet. the linear regulator cont ains a p-channel mosfet. in 1-cell or 2-cell battery input (when vbat AT1305 guarantee starts up as low as 1.0v input. ldo mode the low-dropout linear regulator consists of a reference, an e rror amplifier and a p-channel mosfet. in usb mode, when vin>4v, the linear regulator is active automatically whether the en and /enpb is enabled or not. the output voltage is default 3.3v, 3.0v and 1.8v version. its driving capability is nearly 250ma. ) 2 1 1 ( 2 . 1 2 1 1 r r r r v vdd fb + = ? ? ? ? ? ? + =
AT1305 preliminary product information pfm step-up dc/dc converter with ldo 7f, no.9,park avenue. ii, science-based indu strial park, hsinchu 300,taiwan, r.o.c. tel: 886-3-563-0878 fax: 886-3-563-0879 www: http://www.aimtron.com.tw 2/8/2006 rev:1.1 email: service@aimtron.com.tw 11 power good the pg pin stays high impedance when the dc/dc converter or the ldo output voltage high than 2.7 v, and falling down when the voltage low than 2.6v. it could be used to enable the processo r after the push-button start-up. on/off control a single pushbutton switch can be used to turn the AT1305 on and off. en is pulled low (internal) and /enpb is pulled high when the AT1305 is off. when the switch is pressed, /enpb is pulled low and the ic turns on. the switch s hould be on long enough for the processor to exit reset. the controller issues a l ogic high to en, which guarantees the ic will stay on regardless of the switch state. en /enpb AT1305 0 0 on 0 1 off 1 0 on 1 1 on
AT1305 preliminary product information pfm step-up dc/dc converter with ldo 7f, no.9,park avenue. ii, science-based indu strial park, hsinchu 300,taiwan, r.o.c. tel: 886-3-563-0878 fax: 886-3-563-0879 www: http://www.aimtron.com.tw 2/8/2006 rev:1.1 email: service@aimtron.com.tw 12 package outline : 8-pin tssop inches millimeters symbol min max min max notes a 0.114 0.122 2.90 3.10 - b 0.169 0.177 4.30 4.50 - c 0.244 0.260 6.20 6.60 - d 0.026 bsc 0.65 bsc - e 0.010 0.012 0.25 0.30 - f 0.002 0.006 0.05 0.15 - h 0.041 0.047 1.05 1.20 - k 0.005 bsc 0.127 bsc - m 0.020 0.028 0.50 0.70 0 0 8 0 0 0 8 0 -
AT1305 preliminary product information pfm step-up dc/dc converter with ldo 7f, no.9,park avenue. ii, science-based indu strial park, hsinchu 300,taiwan, r.o.c. tel: 886-3-563-0878 fax: 886-3-563-0879 www: http://www.aimtron.com.tw 2/8/2006 rev:1.1 email: service@aimtron.com.tw 13 reflow profiles sn-pb eutectic assembly pb-free assembly profile feature large body pkg. thickness 2.5mm or pkg. volume 350mm 3 small body pkg. thickness <2.5mm or pkg. volume <350mm 3 large body pkg. thickness 2.5mm or pkg. volume 350mm 3 small body pkg. thickness 2.5mm or pkg. volume 350mm 3 average ramp-up rate (t l to t p ) 3 c/second max. 3 c/second max. preheat -temperature min(tsmin) -temperature max (tsmax) -time (min to max)(ts) 100 c 150 c 60-120 seconds 150 c 200 c 60-180 seconds ts m a x t o t l -ramp-up rate 3 c/second max. time maintained above: -temperature (t l ) -time (t l ) 183 c 60-150 seconds 217 c 60-150 seconds peak temperature(t p ) 225+0/-5 c 240+0/-5 c 245+0/-5 c 250+0/-5 c time within 5 c of actual peak temperature (t p ) 10-30 seconds 10-30 seconds 10-30 seconds 20-40 seconds ramp-down rate 6 c/second max. 3 c/second max. time 25 c to peak temperature 6 minutes max. 8 minutes max. * all temperatures refer to topside of the package, measured on the package body surface.

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