CM2730 300ma d ual l ow n oise cmos ldo 2002/09/30 preliminary rev. 0.3 champion microelectronic corporation page 1 general description features the CM2730 dual ldo family are positive linear voltage regulators developed utilizing cmos technology. CM2730 contains two ldos, one with pre-set output voltage (master ldo1), the other with adjustable output voltage (slave ldo2). each ldo owns its input voltage, bandgap reference voltage, and protection circuit, which reduce noise and cross talk between two ldos. this dual ldo family is featured low quiescent current (60a typ.), low dropout voltage, and high output voltage accuracy. built-in low on-resistance transistor provides low dropout voltage and large output current. 2.2f or greater can be used as an output capacitors. the ptssop-8 package is recommended for configuring portable devices and large current application, respectively. these robust devices are designed to prevent device failure under the worst operation condition with both thermal shutdown and current fold-back. very low shutdown current < 2.0a very low dropout voltage: 300mv @ 300ma low current consumption: typ. 60a, max. 70a output voltage: master ldo1 fixed at 2.5v or 3.3v, and the slave ldo2 adjustable voltage output current range: 0ma ~ 300ma per ldo ptssop-08 package with power pad high accuracy output voltage: +/- 1.5% input range of 2.6v to 7.0v independent thermal shutdown power sequence power good output function independent bandgap current limiting factory pre-set output voltages short circuit current fold-back low temperature coefficient applications battery-powered devices personal communication devices home electric/electronic appliances pc peripherals 24 hours technical support--websim champion provides customers an online circuit simulation tool called websim. you could simply logon our website at www.champion-micro.com for details. pin configuration ptssop-08 (pt-08) front view 1 2 3 4 8 7 6 5 gnd vout1 vin1 enb vfb2 vout2 vin2 pgb www..net
CM2730 300ma d ual l ow n oise cmos ldo 2002/09/30 preliminary rev. 0.3 champion microelectronic corporation page 2 typical application gnd vfb2 vout1 vout2 vin1 vin2 enb pgb output2 c1 c3 c2 output1 input1 rx3 c4 input2 rx1 rx2 vfb2 2.2uf 1.0uf 1.0uf 2.2uf block diagram overcurrent shutdown1 thermal shutdown1 r1 r2 vin1 vout1 gnd vref1 = 1.176v amp1 - + overcurrent shutdown2 thermal shutdown2 rx1 rx2 vin2 vout2 gnd vref2 = 1.176v amp2 - + sequence control1 vfb1 pgb enb power control vfb2 www..net
CM2730 300ma d ual l ow n oise cmos ldo 2002/09/30 preliminary rev. 0.3 champion microelectronic corporation page 3 pin description pin number symbol description 1 gnd master & slave ldo ground 2 vout1 master ldo1 output voltage 3 vin1 master ldo1 input voltage 4 enb master ldo1 enable 5 pgb dual ldo power good signal 6 vin2 slave ldo2 input voltage 7 vout2 slave ldo2 output voltage 8 vfb2 salve ldo2 feedback signal ordering information part number output voltages temperature range package CM2730kit 2.5v & adjustable -40 ~ +85 ptssop-08 (pt-08) CM2730sit 3.3v & adjustable -40 ~ +85 ptssop-08 (pt-08) note: for other pre-set output voltage requirements of fixed ldo1, please contact champion sales office. absolute maximum ratings operating ratings input voltage ?????.???????????. +7v output current ????????.?? p d / (v in - vo) output voltage ???????? gnd-0.3v to v in +0.3v esd classification ???????????????? b ambient temperature range (t a ) ??... -40 to +85 junction temperature range ?..?... -40 to +125 v in1 ? v in2 < 0.8v thermal information parameter maximum unit thermal resistance ( jc ) /w thermal resistance ( ja ) /w internal power dissipation (p d )( t = 100 ) mw maximum junction temperature 150 maximum lead temperature (10 sec) 300 *with junction sink capable of twice times of jc caution: stress above the listed absolute rating may cause permanent damage to the device. www..net
CM2730 300ma d ual l ow n oise cmos ldo 2002/09/30 preliminary rev. 0.3 champion microelectronic corporation page 4 electrical characteristics t a = +25 ; unless otherwise noted CM2730 parameter test conditions min. typ. max. unit input voltage 1 note 1 7 v output voltage 1 accuracy i o1 = 1ma to 300ma -1.5 1.5 % output current 1 v out1 > 1.2v 300 ma current limit 1 v out1 > 1.2v 300 450 ma short circuit current 1 v out1 < 0.95v 150 ma quiescent current 1 v in1 =5v, no load 27 30 35 a ground pin current v in1 =5v, i o1 = 1ma to 300ma 30 35 a i out1 =5ma, v in1 =v out1 +1 to v out1 +2, 2.0v3 -0.3 0.06 0.3 % load regulation 1 i o1 =1ma to 300ma 0.2 1 % dropout voltage 1 i o1 =300ma, v out1 =v out -2.0% 300 mv f=1khz 60 f=10khz 60 power supply rejection 1 i o = 100ma c o =2.2f ceramic f=100khz 50 db over temperature shutdown 1 150 over temperature hysteresis 30 output voltage temp. coeff. 1 25 ppm/ c o =2.2f 30 master ldo1 output noise 1 f=10hz to 100khz i o = 10ma c o =100f 20 vrms input voltage 2 note 1 7 v output voltage 2 accuracy i o2 = 1ma to 300ma -1.5 1.5 % output current 2 v out2 > 1.2v 300 ma current limit 2 v out2 > 1.2v 300 450 ma short circuit current 2 v out2 < 0.95v 150 ma quiescent current 2 v in2 =5v, no load 30 35 a i out2 =5ma, v in2 =v out2 +1 to v out2 +2, v out2 <=2.0 -0.1 0.02 0.1 % i out2 =5ma, v in2 =v out2 +1 to v out2 +2, 2v3 -0.3 0.06 0.3 load regulation 2 i o2 =1ma to 300ma 0.20 1 % i o2 =300ma, v out2 =v out2 -2.0%, v out2 >=2.5v 300 mv dropout voltage 2 i o2 =300ma, v out2 =v out2 -2.0%, v out2 <2.5v 800 mv f=1khz 60 f=10khz 60 power supply rejection 2 i o = 100ma c o =2.2f ceramic f=100khz 50 db over temperature shutdown 2 150 over temperature hysteresis 30 output voltage temp. coeff. 2 25 ppm/ c o =2.2f 30 slave ldo2 output noise 2 f=10hz to 100khz i o = 10ma c o =100f 20 vrms shutdown current v in1 >v in1(min) , v in2 >v in2(min) , enb = v in1 2.0 a www..net
CM2730 300ma d ual l ow n oise cmos ldo 2002/09/30 preliminary rev. 0.3 champion microelectronic corporation page 5 electrical characteristics (conti.) t a = +25 ; unless otherwise noted CM2730 parameter test conditions min. typ. max. unit v in1 >v in1(min) , v in2 >v in2(min) ,enb=gnd, v out1 >0.95v out1 , v out2 >0.95v out2 , 0.1 v pgb (note2) v in1 >v in1(min) , v in2 >v in2(min) ,enb=gnd, v out1 <0.78v out1 , or v out2 <0.78v out2 v in1 v ldo2 turn on threshold voltage (v o1 ) enb=0, v in1 >v in1(min) , v in2 >v in2(min) 0.95v out1 ldo2 turn off threshold voltage (v o1 ) enb=0, v in1 >v in1(min) , v in2 >v in2(min) 0.78v out1 v sh v in1 =2.6v to 7v v in1 /2+0.8 v enb input threshold v sl v in1 =2.6v to 7v v in1 /2-0.8 v note 1. v in(min) = v out + dropout voltage note 2: dual ldo contains 2 ldo, one is fix output voltage 2.5v or 3.3v (2 versions), which is master ldo1, the other is adjustable output voltage, which is slave ldo2. at normal operation condition, master ldo1 turns on first, and then slave ldo2 turns on as master ldo1 output voltage reaches to 95% spec. v out1 . slave ldo2 will turn off as master output decreases to 78% spec. v out1 . detailed description the CM2730 family of cmos regulators provide a preset output voltage ldo (master ldo1), and one adjustable output voltage ldo (slave ldo2) in which each contains p-channel pass transistor, voltage reference, error amplifier, over-current protection, thermal shutdown, and short circuit protection. CM2730 has a power sequence. when master ldo1?s output voltage, which is preset value in design, reaches to its 95~96% nominal output value, internal logic circuits begin to enable the slave ldo2 function which is adjustable output voltage. when both ldo output voltage values are larger than 95% of their nominal output voltage values, the pgb will go low. the p-channel pass transistor receives data from the error amplifier, over-current shutdown, short output protection, and therm al protection circuits. during normal operation, the error amplifier compares the output voltage to a precision reference. over-cu rrent and thermal shutdown circuits become active when the junction temperature exceeds 150 , or the current exceeds 300ma. during thermal shutdown, the output voltage remains low. normal operation is restored when the junction temperature drops below 120 . the CM2730 switches from voltage mode to current mode when the load exceeds the rated output current. this prevents over-stress. the CM2730 also incorporates current fold-back to reduce power dissipation when the output is short-circuited. thi s feature becomes active when the output drops below 0.95v, and reduces the current flow by 65%. full current is restored when the voltage exceeds 0.95v. external capacitor the CM2730 is stable with output capacitors to ground of 2.2f or greater. it can keep stable even with higher or poor esr capacitors. a capacitor is recommended between the input and ground to stabilize each input voltage. the input capacitor should be larger than 0.1f to have a beneficial effect. all capacitors should be placed in close proximity to the pins. a ?quiet? gro und termination is desirable. www..net
CM2730 300ma d ual l ow n oise cmos ldo 2002/09/30 preliminary rev. 0.3 champion microelectronic corporation page 6 typical electrical characteristics www..net
CM2730 300ma d ual l ow n oise cmos ldo 2002/09/30 preliminary rev. 0.3 champion microelectronic corporation page 7 c l =2uf r l =10 ? www..net
CM2730 300ma d ual l ow n oise cmos ldo 2002/09/30 preliminary rev. 0.3 champion microelectronic corporation page 8 www..net
CM2730 300ma d ual l ow n oise cmos ldo 2002/09/30 preliminary rev. 0.3 champion microelectronic corporation page 9 package dimension 8-pin ptssop (pt08) www..net
CM2730 300ma d ual l ow n oise cmos ldo 2002/09/30 preliminary rev. 0.3 champion microelectronic corporation page 10 important notice champion microelectronic corporation (cmc) reserves the right to make changes to its products or to discontinue any integrated circuit product or service without notice, and advises its customers to obtain the latest version of relevant information to ve rify, before placing orders, that the information being relied on is current. a few applications using integrated circuit products may involve potential risks of death, personal injury, or severe property or environmental damage. cmc integrated circuit products are not designed, intended, authorized, or warranted to be suitable for use in life-support applications, devices or systems or other critical applications. use of cmc products in such applications is understood to be fully at the risk of the customer. in order to minimize risks associated with the customer?s applications, th e customer should provide adequate design and operating safeguards. hsinchu headquarter sales & marketing 5f, no. 11, park avenue ii, science-based industrial park, hsinchu city, taiwan 11f, no. 306-3, sec. 1, ta tung road, hsichih, taipei hsien 221, taiwan t e l : +886-3-567 9979 t e l : +886-2-8692 1591 f a x : +886-3-567 9909 f a x : +886-2-8692 1596 www..net
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