AT1391 preliminary product information 1- channel step-down pwm controller 7f, no.9, park avenue ii, science-based indu strial park, hsinchu 300,taiw an, r.o.c. tel: 886-3-563-0878 fax: 886-3-563-0879 www: http://www.aimtron.com.tw 3/15/2006 rev:1.1 email: service@aimtron.com.tw 1 features ? high efficiency ? using external p channel mosfet ? maximum duty 100% ? oscillation frequency 600khz ? soft start by an external capacity ? output voltage accuracy 2% ? built-in on/off function ? built-in short-circuit protection ? stand-by current max. 10 a ? quiescent current 1ma ? input voltage: 2.5v ~7.0v applications ? power supply for portable devices general description the AT1391 provides complete control and p rotection for a dc/dc converter optimized for high-performance microprocessor applications. it is designed to drive one p-channel in a buck topology. the AT1391 integrates all of the control, output adjustment, and protection functions into a single package. the output voltage of the converter can be precisely regulated with a maximum tolerance of 2% over temperature and line voltage variations. the AT1391 is a family of low-noise step-down dc/dc converters that is ideally suited for systems powered from a 1-cell li-ion battery or from a 3-cell to 4-cell nicd, nimh, or alkaline battery. it can also be used to usb-based power system. block dia g ram aimtron reserves the right without notice to change this circuitry and specifications.
AT1391 preliminary product information 1- channel step-down pwm controller 7f, no.9, park avenue ii, science-based indu strial park, hsinchu 300,taiw an, r.o.c. tel: 886-3-563-0878 fax: 886-3-563-0879 www: http://www.aimtron.com.tw 3/15/2006 rev:1.1 email: service@aimtron.com.tw 2 pin configuration ordering information part number package marking AT1391p tssop8 AT1391p AT1391p _ gre tssop8, green AT1391p, date code with one bottom line * for more marking information, contact our sales representative directly pin description symbol pin no. descript symbol pin no.(a/b) descript gnd 1 control blocks ground ss 5 sotf-start vcc 2 power blocks power supply fb 6 error amplifier inverting input scp 3 short-circuit protection comp 7 error amplifier output ctl 4 chip enable, high active out 8 output for pch-mosfet
AT1391 preliminary product information 1- channel step-down pwm controller 7f, no.9, park avenue ii, science-based indu strial park, hsinchu 300,taiw an, r.o.c. tel: 886-3-563-0878 fax: 886-3-563-0879 www: http://www.aimtron.com.tw 3/15/2006 rev:1.1 email: service@aimtron.com.tw 3 absolute maximum ratings *1 rated value parameter condition min. max. unit power supply voltage ? - +7 v source average current of out ? - -50 ma sink average current of out ? - 50 ma source peak current of out ? - -200 ma sink peak current of out ? - 200 ma input voltage to error amplifier ? - 6.5 v continuous power dissipation tssop8 t a =+25 - 500 mw operating temperature ? -30 +85 0 c storage temperature ? -55 +125 0 c hbm 2 kv esd susceptibility * 2 mm 200 v 1. stresses beyond those listed under ?absolute maximum rati ngs? may cause permanent damage to the device. these are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not impl ied. exposure to absolute maximum rating conditions for extended periods may affect device reliability. 2. device are esd sensitive. handling pr ecaution recommended. the human body mo del is a 100pf capacitor discharged through a 1.5k ? resistor into each pin recommended operating conditions (ta=+25 0 c) values parameter symbol min. typ. max. unit power supply voltage v cc 2.5 -- 6 control input voltage v ctl 0 -- 6 v operating temperature t op -20 +25 +85 c
AT1391 preliminary product information 1- channel step-down pwm controller 7f, no.9, park avenue ii, science-based indu strial park, hsinchu 300,taiw an, r.o.c. tel: 886-3-563-0878 fax: 886-3-563-0879 www: http://www.aimtron.com.tw 3/15/2006 rev:1.1 email: service@aimtron.com.tw 4 electrical characteristics (vcc = 5v,t a =+25 , unless otherwise noted. ) values parameter symbol condition min. typ. max. unit input supply range v cc 2.5 -- 6.0 v quiescent current i cc duty=50%, f osc =600khz pdrv/ndrv no load 1.0 1.5 ma current in standby mode i st ctl=0v 10 a reference voltage v ref t a =-20 to +85 1.20 1.22 1.24 v reference voltage line-regulation v ref-line vcc=2.5v to 6.0v 1 5 mv entire device rference variation with temperature t a =-20 to +85 0.5 1.5 % input offset voltage v io 10 mv source current i oh v comp = v ref ?0.5v -1.0 -1.5 -2.0 ma sink current i ol v comp = 0.5v 160 120 80 a source current variation with temperature t a =-20 to +85 20 % sink current variation with temperature t a =-20 to +85 20 % unity gain bandwidth f t 10.0 mhz common mode input voltage range v com 0.2 1.5 v error amplifier dc open loop gain a v 110 db frequency fosc 500 600 700 khz high level voltage 1.0 v low level voltage 0.5 v variation with power supply vcc=2.5v to 6v 2 % sawtooth wave oscillator (osc) variation with temperature t a =-20 to +85 7 % charge current of ss i css -1.0 a soft-start invalid threshold voltage of ss 1.0 v charge current of ss i cscp -1.5 -1.25 -1.0 a short-circuit threshold voltage of scp 0.8 0.9 1.0 v output source current i source duty 95% out=0v - -130 -80 ma
AT1391 preliminary product information 1- channel step-down pwm controller 7f, no.9, park avenue ii, science-based indu strial park, hsinchu 300,taiw an, r.o.c. tel: 886-3-563-0878 fax: 886-3-563-0879 www: http://www.aimtron.com.tw 3/15/2006 rev:1.1 email: service@aimtron.com.tw 5 output sink current i sink duty 5% out=5v 65 100 ma r oh out=-15ma 18 30 ? output block output on resistor r ol out=15ma 16 25 ? v ih active mode 2.0 vcc v ctl input voltage v il standby mode 0 0.5 v control block ctl input current i ctl ctl=5.0v 20 a application circuit
AT1391 preliminary product information 1- channel step-down pwm controller 7f, no.9, park avenue ii, science-based indu strial park, hsinchu 300,taiw an, r.o.c. tel: 886-3-563-0878 fax: 886-3-563-0879 www: http://www.aimtron.com.tw 3/15/2006 rev:1.1 email: service@aimtron.com.tw 6
AT1391 preliminary product information 1- channel step-down pwm controller 7f, no.9, park avenue ii, science-based indu strial park, hsinchu 300,taiw an, r.o.c. tel: 886-3-563-0878 fax: 886-3-563-0879 www: http://www.aimtron.com.tw 3/15/2006 rev:1.1 email: service@aimtron.com.tw 7
AT1391 preliminary product information 1- channel step-down pwm controller 7f, no.9, park avenue ii, science-based indu strial park, hsinchu 300,taiw an, r.o.c. tel: 886-3-563-0878 fax: 886-3-563-0879 www: http://www.aimtron.com.tw 3/15/2006 rev:1.1 email: service@aimtron.com.tw 8 small 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 -
AT1391 preliminary product information 1- channel step-down pwm controller 7f, no.9, park avenue ii, science-based indu strial park, hsinchu 300,taiw an, r.o.c. tel: 886-3-563-0878 fax: 886-3-563-0879 www: http://www.aimtron.com.tw 3/15/2006 rev:1.1 email: service@aimtron.com.tw 9 reflow condition (ir/convection or vpr reflow ) classification reflow profiles profile feature sn-pb eutectic assembly pb-free assembly 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 time maintained above: -temperature (t l ) -time (t l ) 183 c 60-150 seconds 217 c 60-150 seconds peak/classification temperature(t p ) see table 1 see table 2 time within 5 c of actual peak temperature (t p ) 10-30 seconds 10 seconds max. ramp-down rate 6 c/second max. 6 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. classification reflow profiles(cont.) table 1. snpb entectic process C package peak reflow temperatures package thickness volume mm 3 <350 volume mm 3 350 <2.5mm 240+0/-5 225+0/-5 2.5mm 225+0/-5 225+0/-5 table 2. pb - free process C package classification reflow temperatures package thickness volume mm 3 <350 volume mm 3 350-2000 volume mm 3 >2000 <1.6mm 260+0 260+0 260+0 1.6mm - 2.5mm 260+0 250+0 245+0 2.5mm 250+0 245+0 245+0 *tolerance: the device manufacturer/supplier sha ll assure process compatibility up to and including the stated classifi cation temperature (this means peak reflow temperature +0 ? . for example 260 ? +0 ? ) at the rated msl level.
|
