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unisonic technologies co., ltd uc2306 linear integrated circuit www.unisonic.com.tw 1 of 12 copyright ? 2008 unisonic technologies co., ltd qw-r103-029,b micropower dc/dc converters with low-battery detector active in shutdown ? description the utc uc2306 is a step-up dc/dc converter which operate from a wide input suppl y range of 1.5v to 8v. its peak switch current can be reduced by adding a single resistor at the i lim pin. it is an ideal for use in small, low voltage, battery-operated systems. ? features *in shutdown mode:10 a quiescent current. *low battery detector active *minimum operating voltage: 1.5v *very low v cesat: 370mv@1a (typ). *in active mode :120 a quiescent current. *only by one resistor: peak current is programmable. dip-8 sop-8 *pb-free plating product number: uc2306l ? ordering information ordering number normal lead free plating package packing UC2306-XX-D08-T uc2306l-xx-d08-t dip-8 tube uc2306-xx-s08-r uc2306l-xx-s08-r sop-8 tape reel uc2306-xx-s08-t uc2306l-xx-s08-t sop-8 tube
uc2306 linear integrated circuit unisonic technologies co., ltd 2 of 12 www.unisonic.com.tw qw-r103-029,b ? pin configuration 1 2 3 4 8 7 6 5 lbi sw v in lbo gnd i lim shdn fb(sense) ? pin description pin no. symbol description 1 lbi input of low battery detector. detector outpu t is low when voltage on this pin is less than 1.17v. 2 lbo output of low battery detector. 3 v in input voltage supply. 4 sw the collector pin of power npn. 5 gnd ground. 6 i lim pin for current limit set. connected to nothing for 1a peak switch current; and connect to a resistor to ground will lower peak current 7 shdn input of shutdown.held low, then switching regulator is tu rned off. this pin should not be float. when shdn mode is not used, connect it to v in 8 fb/sense this pin connects to the resistor divider. in shutdown mode,the divider is disconnected from it.
uc2306 linear integrated circuit unisonic technologies co., ltd 3 of 12 www.unisonic.com.tw qw-r103-029,b ? block diagrams 1.5v under voltage lockout + - - + a1 a2 + - enable driver gnd ilim shdn shutdown 1.24v v ref q 2 1 q 1 200 1k q 3 bias -1v r 2 36mv r 1 7.2 ? v in sw c 1 + c 2 + d 1 l 1 v in v out lbo lbi a3 1.17v r 3 r 4 fb 1k timers 6 s on 1.5 s off 2 8 1 5 6 7 4 3 uc2306 block diagram. note a3 remains alive when device is in shutdown uc2306-3.3/uc2306-5.0 block diagram
uc2306 linear integrated circuit unisonic technologies co., ltd 4 of 12 www.unisonic.com.tw qw-r103-029,b ? absolute maximum ratings parameter symbol rating unit input voltage v in 8 v sw voltage v sw -0.4 ~ +25 v fb voltage(uc2306) v fb v in +0.3 v i lim voltage(uc2306-3. 3/uc2306-5.0) v ilim 5 v shdn voltage v shdn 6 v lbi voltage v lbi v in v lbo voltage v lbo 8 v maximum power dissipation p d 500 mw junction temperature t j 125 c operating temperature t opr -20 ~ +85 c storage temperature t stg -65 ~ +150 c note: absolute maximum ratings are those values beyond which the device could be permanently damaged. absolute maximum ratings are stress ratings only and functional device operat ion is not implied. ? electrical characteristics (v in =2v, v shdn =2v, unless otherwise specified) parameter symbol test conditions min typ max unit minimum operating voltage v cc(min) 1.5 1.65 v operating voltage v in 8 v quiescent current i q v shdn =2v, not switching(note) 120 200 a v shdn =0v, v in =2v(note) 7 15 a quiescent current in shutdown i sd v shdn =0v, v in =5v(note) 27 50 a comparator trip point (note) 1.22 1.24 1.26 v fb pin bias current i fb (note) 10 25 na sense pin leakage in shutdown i leak(sd) v shdn =0v, fixed output versions(note) 0.002 1 a line regulation v out 1.8v v in 8v (note) 0.04 0.15 %/v lbi input threshold v lbi(thr) falling edge(note) 1.10 1.17 1.25 v lbi bias current i lbi (bias) (note) 6 20 na lbi input hysteresis i lbi (hys) (note) 35 65 mv lbo output voltage low v lbo(ol) i sink =500a(note) 0.2 0.4 v lbo output leakage current i lbo(leak) lbi=1.5v, lbo=5v(note) 0.01 0.1 a high (note) 1.4 v shdn input voltage low v shdn (note) 0.4 v v shdn =5v(note) 5 8 a shdn pin bias current i shdn v shdn =0v(note) -5 -2 a switching off time t off (note) 1 1.5 2 s switch on time t on current limit not asserted (note) 4 6 8 s maximum duty cycle t duty current limit not asserted (note) 76 80 88 % i lim pin open, v in =5v 0.8 1 1.2 a peak switch current i (sw) 20k from i lim to gnd 500 ma isw=1a 0.37 v switch saturation voltage v sw(sat) isw=700ma(note) 0.26 0.35 v switch leakage i leak(sw) switch off, vsw=5v 0.01 7 a note: denotes specifications which apply over the 0 c to 70 c operating temperature range.
uc2306 linear integrated circuit unisonic technologies co., ltd 5 of 12 www.unisonic.com.tw qw-r103-029,b ? typical application + + 200k vin sw lbo lbi fb i lim shdn gnd 47k 47k 22k 100 f 220 f 5v 100ma 2 cells 0.01 f 1.21m (1%metal film) 33 h 2n3906 mbrs130l uc2306 super burst low i q dc/dc converter i q 10 a 3.83m (1%metal film)
uc2306 linear integrated circuit unisonic technologies co., ltd 6 of 12 www.unisonic.com.tw qw-r103-029,b ? typical application(cont.) + v in sw sense ilim shdn gnd c 2 47 f 16v 3.3v 300ma l1a uc2306-3.3 c 3 100 f 10v + mbrs130l shutdown nc 21 4 3 c 1 1 f l1b* v in 2.5v to 8v 3.3v sepic efficiency(step-up/step-down converter) + v in sw sense ilim shdn gnd 47 f 16v 5v 200ma l1a uc2306-5.0 100 f 10v + mbrs130l shutdown nc 21 4 3 c 1 1 f l1b v in 3v to 8v 5v sepic (step-up/step-down converter)
uc2306 linear integrated circuit unisonic technologies co., ltd 7 of 12 www.unisonic.com.tw qw-r103-029,b ? typical application(cont.) + v in sw lbi sense ilim lbo shdn gnd 100 f 22 h uc2306-5.0 single li-lon cell to 5v conv erter with load disconnect at v in 2.7v 220k nc mbrs130l 562k 1% 432k 1% single li-ion cell v out v in1 v ins en v in2 v in3 gnd 5v 1 f + nc nc v out + 100 f 10v
uc2306 linear integrated circuit unisonic technologies co., ltd 8 of 12 www.unisonic.com.tw qw-r103-029,b ? typical application(cont.) + v in sw sense ilim shdn gnd 47 f 5v 100ma l 1 22 h uc2306-5.0 220 f + mbrs130l shutdown nc 2- to 4- cell to 5v converter with output disconnect v in 2v to 6v 2k 22 f + ztx788b
uc2306 linear integrated circuit unisonic technologies co., ltd 9 of 12 www.unisonic.com.tw qw-r103-029,b ? typical application(cont.)
uc2306 linear integrated circuit unisonic technologies co., ltd 10 of 12 www.unisonic.com.tw qw-r103-029,b ? typical characteristics 90 load current (m) super burst efficiency e f f i c i e n c y ( % ) 0.1 1.0 10 100 v in =3v 0.01 80 70 60 50 40 v in =2v 1 10 100 300 65 70 75 5v to 12v conver ter efficiency efficiency (%) load current(ma) 80 85 90
uc2306 linear integrated circuit unisonic technologies co., ltd 11 of 12 www.unisonic.com.tw qw-r103-029,b ? typical characteristics(cont.) saturation voltage (mv) 0 200 300 400 500 1.2 0 0.2 0.4 0.6 100 0.8 1.0 1.2 switch saturation voltage switch current (a) ta =25 peak current (a) -50 0.8 0.9 1.0 1.1 100 0.6 -25 0 25 0.7 50 75 peak switch current limit temperature( ) 1.3 6 time ( s) -50 2 3 4 5 100 0 -25 0 25 1 50 75 temperature( ) 7 on-and off-times 8 maximum on- time off-time 1.240 feedback voltage (v) -50 1.220 1.225 1.230 1.235 100 1.210 -25 0 25 1.215 50 75 1.245 1.250 temperature( ) feedback voltage 1.205 1.200 16 bias current (na) -50 8 10 12 14 100 4 -25 0 25 6 50 75 18 20 temperature( ) feedback pin bias current 2 0 supply current (us) 0 150 200 250 300 6 50 123 100 45 input voltage (v) supply current 0 78 vshdn=vn not switching vshdn= 0 v ta =25
uc2306 linear integrated circuit unisonic technologies co., ltd 12 of 12 www.unisonic.com.tw qw-r103-029,b utc assumes no responsibility for equipment failures that result from using products at values that exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or other parameters) listed in products specifications of any and all utc products described or contained herein. utc products are not designed for use in life support appliances, devices or systems where malfunction of these products can be reasonably expected to result in personal injury. reproduction in whole or in part is prohibited without the prior written consent of the copyright owner. the information presented in this document does not form part of any quotation or contract, is believed to be accurate and reliable and may be changed without notice.

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