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at1310 preliminary product information micropower charge pump converter 7f, no.9, park avenue. ii, science-based indust rial 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 ? step-up type charge pump ? input range 2.7v to 5v ? low input current 25 a ? high output voltage accuracy 4% ? 100ma output current with vin 3.0v 50ma output current with vin 2.7v ? high frequency 750khz operation ? sot-26 package applications ? cellular phones ? led backlight driver ? dsc flash unit for igbt trigger level general description the at1310 is a microp ower switched-capacitor voltage converter that delivers a regulated output. n o external inductor is required for operation. using three small capacitors, the at1310 can deliver up to 100ma to the regulated output. the at1310 features very lo w quiescent current and high frequency over a large portion of its load range making this device ideal for battery- p owered applications. block diagram aimtron reserves the right without notice to change this circuitry and specifications.
at1310 preliminary product information micropower charge pump converter 7f, no.9, park avenue. ii, science-based indust rial 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(or pin assignment) ordering information part number package marking at1310x sot-26 date code at1310x_pbf sot-26, pbf ,date code with one bottom line : date code * for more marking information, contact out sales representative directly pin description pin no. symbol i/o description 1 out o regulated output 2 gnd p ground 3 /shdn i chip enable input 4 cn - flying capacitor negative terminal 5 vin p input supply 6 cp + flying capacitor positive terminal
at1310 preliminary product information micropower charge pump converter 7f, no.9, park avenue. ii, science-based indust rial 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 in ? ? 6.0 v out pin voltage v out ? ? 6.0 v shdn pin voltage v shdn ? ? 6.0 v allowable dissipation p d ? ? 150 mw operating temperature t op ? -30 +85 0 c storage temperature t stg ? -55 +125 0 c 1. stresses beyond those listed under ?absolute maximu m ratings? may cause permanent damage to the device. these are stress ratings only, and functional operation of the devi ce at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. exposure to absolute maximum rating conditions for extended periods may affect device reliability . electrical characteristics (ta=+25 0 c) values parameter symbol condition min. typ. max. unit input voltage v in v out =5.0v 2.7 - v out v no load supply current v start 2.7v< v in <5.0v,i out =0ma, /shdn=v in - 25 40 a 2.7v< v in <5.0v ,i out 50ma 4.8 5.0 5.2 v output voltage v out 3.0v< v in <5.0v ,i out 100ma 4.8 5.0 5.2 v 2.7v< v in <3.6v ,i out =0ma, /shdn=0v - - 1 a shutdown current i shdn 3.6v< v in <5.0v ,i out =0ma, /shdn=0v - - 4 a v in =3v, i out =50ma - 25 - mv ripple current v ripple v in =3v, i out =100ma - 30 - mv v in =3v, i out =50ma - 83 - % efficency v in =2.7v, i out =50ma - 92 - % frequency f oscillator free running - 750 - khz v ih 1.4 - - v /shdn input threshold v il - - 0.3 v i ih /shdn= v in -2 - 2 a /shdn input current i il /shdn= 0v -2 - 2 a out turn-on time t on v in =3v, i out =0ma - 2 - ms short-circuit current i sc v in =3v,v out =gnd,/shdn=3v - 300 - ma
at1310 preliminary product information micropower charge pump converter 7f, no.9, park avenue. ii, science-based indust rial 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 typical characteristics :
at1310 preliminary product information micropower charge pump converter 7f, no.9, park avenue. ii, science-based indust rial 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
at1310 preliminary product information micropower charge pump converter 7f, no.9, park avenue. ii, science-based indust rial 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 typical application schematic fig1. typical charge pump boost converter circuit fig2. 5v/100ma supply powered from a usb port
at1310 preliminary product information micropower charge pump converter 7f, no.9, park avenue. ii, science-based indust rial 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 fig3. led driver from a li-ion battery source
at1310 preliminary product information micropower charge pump converter 7f, no.9, park avenue. ii, science-based indust rial 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 application information 1. capacitor selection it is very important to select the capacitors c in , c out and c fly because they will affect turn on time, output ripple and transient performance. ceramic capacitors offer many advantages over other tantalum and aluminum electrolytic counterparts. in genera l, the capacitors can be used 10 f for c in and c out , and 1 f for c fly under maximum output load conditions. lower values for cin, cout and cfly may be utilized for light load current applications. large ceramic capacitors are typically compos ed of x7r, x5r, z5u or y5v dielectric materials. if y5v and z5u are selected for used with the charge pump, the nominal value should be doubled to compensated for the cap acitor tolerance which can vary more than 50% over operating temperature ra nge. x7r and x5r dielectrics are much more desirable. the temperature tolerance of x7r dielectric is better than 15% . 2. charge pump efficiency the at1310 is a regulated output voltage char ger pump converter. the efficiency can be defined as a linear voltage regulator with an effective output voltage that is equal to two times the input voltage. the expression to defi ne the ideal efficiency can be shown as: refer to the typical characteristics section fo r measured plots of efficiency versus input voltage and output load current for the gi ven charge pump output voltage options. 3. layout guideline as a general rule for charge pump boost convert ers, all external capacitors should be located as closed as possible to the device package with minimum length trace connections. a local component side ground plane is recommended. if this is not possible due to the layout limitations, assure good ground connections by th e use of large or multiple pcb via?s. refer to the following at1310 evaluation board layout. ( application circuit fig3.) in out out in out out in out v v i v i v p p = = = 2 2
at1310 preliminary product information micropower charge pump converter 7f, no.9, park avenue. ii, science-based indust rial 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 topoverlayer toplayer bottomlayer
at1310 preliminary product information micropower charge pump converter 7f, no.9, park avenue. ii, science-based indust rial 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 small outline sot-26 inches millimeters symbol min max min max notes a 0.035 0.057 0.90 1.45 - a1 0.000 0.006 0.00 0.15 - a2 0.035 0.051 0.90 1.30 - b 0.010 0.020 0.25 0.50 - c 0.003 0.008 0.08 0.20 - d 0.110 0.122 2.80 3.10 - e 0.102 0.118 2.60 3.00 - e1 0.059 0.069 1.50 1.75 - l 0.014 0.022 0.35 0.55 e 0.037ref 0.95ref e1 0.075ref 1.90ref r 0 0 10 0 0 0 10 0 -
at1310 preliminary product information micropower charge pump converter 7f, no.9, park avenue. ii, science-based indust rial 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 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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