da9128a.002 july 12, 1998 1 0$6 $ /'29rowdjh5hjxodwru,& 7kuhhorzgursrxwyrowdjhuhjxodwruv 5hjxodwruhqdeohglvdeohfrqwuro 3rzhuvdylqjvohhsprgh 7khupdosurwhfwlrq '(6&5,37,21 the mas9128a is voltage regulator ic with three 2.85v ldo regulators providing voltage regulation for the handset terminal. the output voltages of the three regulators can be modified through a mask option. two enable/disable pins control the state of the regulators. in order to save power the device goes into sleep mode when all regulators are disabled. an internal thermal protection circuit prevents the device from overheating. the maximum output current is limited internally. )($785(6 $33/,&$7,21 2.85v regulators at 100ma, 70ma and 50ma output accuracy < 3% fast dynamic response low output noise low supply current: 150a per regulator so8 package mobile phones cordless phones battery powered systems %/2&.',$*5$0 & bandgap reference ldo_b (70ma) outb vref ena gnd vcc enbc ldo_a (100ma) outa ldo_c (50ma) outc & & temperature protection &
da9128a.002 july 12, 1998 2 3,1&21),*85$7,21 1 2 3 4 5 6 7 8 so8 outa outb outc ena enbc gnd vcc vref 3,1'(6&5,37,21 3lq1dph 3lq 7\sh )xqfwlrq outa 1 o 2.85v/100ma regulator output outc 2 o 2.85v/50ma regulator output enbc 3 i enable for regulators b and c ena 4 i enable for regulator a vref 5 o reference voltage gnd 6 p ground vcc 7 p positive supply voltage outa 8 o 2.85v/70ma regulator output
da9128a.002 july 12, 1998 3 $%62/87(0$;,0805$7,1*6 (all voltages with respect to ground.) 3dudphwhu 6\pero &rqglwlrqv 0lq 0d[ 8qlw supply voltage v cc -0.3 13.0 v logic input voltage v en -0.3 v cc +0.3 max. junction temperature t j 150 0 c thermal resistance r ja 163 0 c/w lead temperature for 10 seconds 230 0 c storage temperature t s -55 +150 0 c esd rating note 1: stresses beyond those listed may cause permanent damage to the device. the device may not operate under these conditions, but will not be destroyed. 5(&200(1'('23(5$7,21&21',7,216 3dudphwhu 6\pero &rqglwlrqv 0lq 7\s 0d[ 8qlw supply voltage v cc 3.1 6.5 v operating temperature t amb -20 +70 0 c (/(&75,&$/&+$5$&7(5,67,&6 u 7khupdosurwhfwlrq 3dudphwhu 6\pero &rqglwlrqv 0lq 7\s 0d[ 8qlw threshold high t h 130 150 170 0 c threshold low t l 120 140 160 0 c continuos power dissipation in operation t amb = 25 0 c 644 mw t amb = 70 0 c 368 mw note 2:a hysteresis of 10 0 c avoids oscillation in case of thermal shutdown. after the regulator temperature has dropped by this value, it will turn on again automatically. u 'ljlwdo,qsxwv (1$(1%& (t am b = -20 0 c to +70 0 c, unless otherwise noted. typical value for t j is 27 0 c.) 3dudphwhu 6\pero &rqglwlrqv 0lq 7\s 0d[ 8qlw input high voltage v ih 2.2 v input low voltage v il 0.40 v
da9128a.002 july 12, 1998 4 (/(&75,&$/&+$5$&7(5,67,&6 u 5hjxodwru2xwsxwv /'2b$/'2b%/'2b& (t am b = -20 0 c to +70 0 c, unless otherwise noted. typical value for t j is 27 0 c cin=1f cout= 1f,ceramic) 3dudphwhu 6\pero &rqglwlrqv 0lq 7\s 0d[ 8qlw output voltage v ou t 3.1v < v cc < 6.5v, 0ma < i ou t < i max 2.7 2.85 3.0 v short circuit current ldo_a i maxa 310 ma ldo_b i maxb 220 ma ldo_c i maxc 170 ma load current ldo_a i out a 0 100 ma ldo_b i outb 070ma ldo_c i outc 050ma line regulation 1vpp at v cc , max. load 1.1 10 mv load regulation 0ma < i ou t < i max ldo_a 945mv ldo_b 631mv ldo_c 522mv load transient t amb = 25 o c 10ua to ? load in 1us ( 4) -60 mv 100ua to max. load in 1us (4) -70 mv 10ua to max. load in 1us (5) -85 mv psrr f 10khz, 1vpp at v cc = 4.5v cref = 10nf 50 60 db quiescent current per regulator (3) i qr on, max. load 170 ua i qr on, i ou t = 100ua 150 ua i qr off <1 ua total quiescent current i q ena = enbc = 0v i ou t = 0 v cc = 6.5v <1 30 a noise 10hz < f < 100khz typical load, no capacitor at vref 190 uvrms 10hz < f < 100khz typical load, 10nf cap. at vref 50 uvrms settling time enables off to on 2.7v < v ou t < 3.0v 10nf cap. at vref 0.5 1.0 ms output capacitor c ou t 0.8 1.0 2.6 uf esr 0.01 0.1 1 ohm note 3:to get the real quiescent current of the device, the quiescent current of the reference voltage generator (140ua typ.) has to be added together once for all regulators. note 4:v out does not drop below 2.7v for more than 1us. note 5:v out does not drop below 2.5v for more than 1us or below 2.7v for more than 50us.
da9128a.002 july 12, 1998 5 )81&7,216 - u 6xsso\9rowdjh9rowdjh5hjxodwruv the device is supplied with 3.1v to 6.5v battery voltage under normal conditions. an internal band gap voltage reference is used to generate the reference voltage for all three voltage regulators. the reference voltage is routed via an internal 20kohm resistor to an external pin where a filter capacitor can be connected in order to reduce the noise level of all three regulators. the startup time of the reference voltage is then determined by the value of the bypass capacitor at pin vref. u (qdeoh3lqv each regulator can be enabled/disabled by the two enable pins ena and enbc. pin ena controls regulator ldo_a and pin enbc controls both regulators ldo_b and ldo_c. if both enable pins are forced low, the internal voltage reference and internal bias source are turned off in order to save power. a common enable for all three regulator outputs is designed, but connected to vdd internally for the soic8 version of mas9128a. u 5hjxodwruv the device contains three 2.85v low dropout cmos regulators with maximum output currents of 100ma, 70ma and 50ma. there is a mask option to modify the output voltage to 2.55v, 2.70v, 2.85v, 3.00v or 3.15v. the ic has thermal protection in order to prevent thermal destruction especially at high ambient temperatures. maximum output current of each regulator is limited by an internal circuitry. the regulation loop of the regulators is optimized to work with low esr ceramic buffer capacitors at the output. /rjlfwdeohiru(qdeohlqsxwv (1$ (1%& /'2b$ /'2b% /'2b& 95() 1 1 on on on on 1 0 on off off on 0 1 off on on on 0 0 off off off off $33/,&$7,21,1)250$7,21 0$6 $ 95() 287& 287% 287$ q) 9&& *1' (1$ (1%& rii rq x) x) x) 9 9 9 x) 9,199
da9128a.002 july 12, 1998 6 3$&.$*(287/,1(6$1'5(&200(1'('/$1'3$77(51 0.10 0.25 1.35 1.75 seating plane 4.80 5.00 5.80 6.20 pi n 1 3.80 4.00 0.50 x 45 0 . 4 0 1 . 2 7 8 lead so outline all measurements i n mm 1.27 bsc 0.33 0.51 0 - 8 0.25 x 45 7.47 pin 1 2.39 1.27 0.71 pad layout
da9128a.002 july 12, 1998 7 25'(5,1*,1)250$7,21 n mas9128as ldo voltage regulator ic so8 MAS9128AS-T ldo voltage regulator ic so8 tape and reel /2&$/',675,%8725 0,&521$6&217$&76 micronas semiconductor gmbh lohweg 29 d-85375 neufahrn, germany tel. (08165) 9521 0 tel. int. + 49 8165 9521 0 telefax + 49 8165 9521 99 micronas semiconductor sa ch. chapons-des-prs ch-2022 bevaix, switzerland tel. (032) 847 0111 tel. int. +41 32 847 0111 telefax +41 32 846 1930 micronas oy kamreerintie 2, p.o.box 51 fin-02771 espoo, finland tel. (09) 80521 tel. int. +358 9 80521 telefax +358 9 8053213 127,&( micronas reserves the right to make changes to the products contained in this data sheet in order to improve the design or perf ormance and to supply the best possible products. micronas assumes no responsibility for the use of any circuits shown in this data sheet, con veys no license under any patent or other rights unless otherwise specified in this data sheet, and makes no claim that the circuits are free f rom patent infringement. applications for any devices shown in this data sheet are for illustration only and micronas makes no claim or wa rranty that such applications will be suitable for the use specified without further testing or modification.
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