p ublic doc. ds - 100613 v 1 . 3 www.cissoid.com 1 of 7 the leader in high temperature semiconductor solutions cht - ldns - datasheet version : 1 . 3 10 - nov - 10 (last modification date) high - temperature, negative 2.5v; 3.3v; 5v; 5.5v; 9v; 10v; 12v; 13v or 15v, low - dropout cmos voltage regulator for symmetrical voltage applications. general description the cht - ldns is a 1a, low - dropout neg a tive linear voltage regulator compat i- ble with high - temperature environments. typical operation temperature range e x- tends from - 55c to 225c. the circuit is stable throughout the whole temperature range and under a large choice of capacitive loads. the minimum dropout volta ge (v in - v out ) is - 2v for load current up to 1a. the dropout voltage can span from - 2 volt s down to - 20 volts (1) . related documents: ? an - 06016 : selecting correct ci s- soid regulator depending on your a p- plication ? an - 06002: voltage regulator short - circuit protection and associated p o- tential startup problem. ? an - 090477: power dissipation co n- siderations during short circuit cond i- tions applications power supplies for high - temperature ele c- tronic systems used in well logging, automotive, aeronautics or aeros pace applications. features ? - 2v to - 20v (1) dropout voltage ? max 1a output current @ 225c ? 60db input ripple rejection (0 - 200hz) ? c load from 100nf to 1000f, large esr range ? available as die or in custom package on demand. (3 - pin compatible) ? the start - up is operative over the whole temperature range ? latch - up free available voltages: ? cht - ldnsb - 025: - 2.5v ? cht - ldns - 033: - 3.3v ? cht - ldns - 050: - 5.0v ? cht - ldns - 055 : - 5.5v ? cht - ldns - 090 : - 9.0v ? cht - ldns - 100 : - 10.0v ? cht - ldns - 120: - 12.0v ? cht - ldns - 130: - 13.0v ? cht - ldns - 150: - 15.0v typical application c h t - l d n s c o u t g n d - v i n - v o u t - 2 v v i n v o u t c i n - v o u t r l o a d
10 - nov - 10 contact : gonzalo picn (+32 - 10 - 489214) nov. 10 cht - ldns - datasheet (last modification date) p ublic doc. ds - 100613 v 1 . 3 www.cissoid.com 2 of 7 absolute maximum ratings supply voltage vin 0.3 - 40v junction temperature (2) (tj) 315c power dissipation (3) esd rating (expected) human body model >1kv operating conditions supply voltage - 2 to - 20v dropout (1) junction temperature - 55 c to 225c power dissipation (3) caution: stresses above those listed in absolute maximum ratings may cause permanent damage to the device. this is a stress only rating and operation of the device at these or any other conditions above those indicated in the operational sections of this spec i- fic ation is not implied. frequent or extended exposure to absolute maximum rating conditions or above may affect device reliability. electrical characteristics the following table is relative to the - 15v mode (cht - ldns - 150) with vin= - 17v ( - vout - 2v). for other nominal voltage, see notes under this table. parameter condition min typ max units note output voltage acc u- racy i l =10ma - 55c 14v and better than x mv/v for |vin|14v. ( 6 ) this includes the packaging parasitic resistor. (7) defining x as the nominal voltage, the typical quiescent current at 2v dropout can be approximated as 2.575+ x *0.035 (ma) @ - 55c and 2.645+ x *0.057 (ma) @ 225c. (8) defining x as the nominal voltage, the minimum power supply rejection ratio is (tbd) (9) defining x as the nominal voltage, typical noise level is (tbd) (10) short circuit current for 2.5v typical value is 1a and max value is 1.3a
10 - nov - 10 contact : gonzalo picn (+32 - 10 - 489214) nov. 10 cht - ldns - datasheet (last modification date) public doc. ds - 100613 v 1 . 3 www.cissoid.com 3 of 7 input capacitor and o utput load recommended specifications a minimum load current of 5ma is required. bellow this value, a small oscillation of few tens of mv can occurs at the regulator output. resistances in series with capacitors represent the internal esr of these capacitors. f or large capacitors : for small capacitors: c b = 0 to 1000f c s = 100n to 220nf r b = 0.2 to ? ? r s =10m to 50m ? for medium capacitors: c m = 0 to 6f r m =0.1 to 1 ? operating conditions start - up conditions the start - up is operative over the whole temperature range as long as all loads are connected to ground. the start - up is not guaranteed if the positive regulator output has a current path directly connected to a negative voltage. indeed, such load cond i- tion can lead to wrong activation of the short - circuit protection, i.e. a bad start - up or a bad recovering after short - circuit. in this case, it is recommended to use our cht - ldos regulator family instead of cht - ldop regulator family. please refer to our application notes for more details: ? an - 06016 : selecting correct ci s- soid regulator depending on your a p- plication ? an - 06002: voltage regulator short - circuit protection and associated p o- tential startup problem. fast load current transients output voltage overshoots and und e r- shoots are ~10% of the nominal regulated voltage when c load >22f (esr<1ohm) and load current transients (10ma ? 1a) within 1s. for transients longer than 10s, load capacitance of 1f is enough. power dissipation considerations when determining the maxim um power dissipated by the regulator, not only the dissipation during normal operation must be considered, but also the power diss i- pated during any eventual short circuit or overload. during short circuit or overload, worst case conditions are normally fo und for max i- mum vin and a shorting resistance in the order of few ohms. entering into short - circuit or overload co n- ditions with high input voltages vin may lead to extreme overheating, placing the part above absolute maximum rating conditions. please refer to our application note for more detail: ? an - 090477 : power dissipation co n- siderations during short circuit cond i- tions shorting the regulator input if the input terminal is shorted to ground once the output capacitance has been charged, a large current corresponding to the discharge of the output capacitor will flow from the output to the input through c h t - l d n s c s g n d v i n v o u t i l o a d 3 5 m a r s r m c m r b c b l o a d c i n - v i n
10 - nov - 10 contact : gonzalo picn (+32 - 10 - 489214) nov. 10 cht - ldns - datasheet (last modification date) public doc. ds - 100613 v 1 . 3 www.cissoid.com 4 of 7 the drain - body diode of the internal pass transis tor. this large current may cause the permanent damage of the part. sinking current or r aising the output voltage above the input voltage can cause permanent damage to the part . regu lator floating ground when the ground becomes disconnected, the output vo ltage gets unregulated, cau s- ing possible damage to other circuits co n- nected to v out . if the ground terminal is reconnected while vin is applied , perm a- nent damage may also occur to the reg u- l a tor. if a regulator needs to be reco n- nected with the power supply on, then connect the ground terminal first.
10 - nov - 10 contact : gonzalo picn (+32 - 10 - 489214) nov. 10 cht - ldns - datasheet (last modification date) public doc. ds - 100613 v 1 . 3 www.cissoid.com 5 of 7 typical performance characteristics (cht - ldns - 150) note : temperatures hereafter are ambient temperat ures figure 1 : - v out vs.i load (@2v dropout) figure 2 : zoom on figure 1 figure 3 :short - circuit current vs. t figure 4 : - vout vs. t (dropout=2v ; iload=60ma, 4 samples) figure 5 : - vout vs. - vin over t (iload=60ma) figure 6 : typical max load current over t vs. dropout tbd tbd figure 7 : s vout (v2/hz)@25c, i load =100ma figure 8 : input ripple rejection 25 c - 40 c 150 c 225 c i load (a) - v out (v) 0 2 4 6 8 10 12 14 16 0 0.5 1 1.5 2 2.5 3 3.5 25 c - 40 c 150 c 225 c i load (a) - v out (v) slope < 70m ? 14.8 14.9 15 15.1 15.2 0 0.5 1 1.5 2 2.5 3 t( c) i sc (a) 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 -50 0 50 100 150 200 250 - v out (v) t( c) 14.9 15 15.1 15.2 15.3 -50 0 50 100 150 200 250 v in (v) - v out (v) 25 c 225 c 14.7 14.9 15.1 15.3 15 20 25 30 dropout=2v temperature ( c) max i load (a) 0 0.5 1 1.5 2 2.5 -50 0 50 100 150 200 250
10 - nov - 10 contact : gonzalo picn (+32 - 10 - 489214) nov. 10 cht - ldns - datasheet (last modification date) public doc. ds - 100613 v 1 . 3 www.cissoid.com 6 of 7 p ackaging and pinout to - 3 metal can to - 254 header bottom view front view ordering information ordering reference p ackage output voltage temperature range marking cht - ldns b - 025 - to3 - t metal to3 2.5v - 55c to +225c cht - ldns - 025 cht - ldns b - 025 - to254 - t metal to254 2.5v - 55c to +225c cht - ldns - 025 cht - ldns - 033 - to3 - t metal to3 3.3v - 55c to +225c cht - ldns - 033 cht - ldns - 033 - to254 - t metal to254 3.3v - 55c to +225c cht - ldns - 033 cht - ldns - 050 - to3 - t metal to3 5v - 55c to +225c cht - ldns - 050 cht - ldns - 050 - to254 - t metal to254 5v - 55c to +225c cht - ldns - 050 cht - ldns - 055 - to3 - t metal to3 5.5v - 55c to +225c cht - ldns - 055 cht - ldns - 055 - to254 - t metal to254 5.5v - 55c to +225c cht - ldns - 055 cht - ldns - 090 - to3 - t metal to3 9v - 55c to +225c cht - ldns - 090 cht - ldns - 090 - to254 - t metal to254 9v - 55c to +225c cht - ldns - 090 cht - ldns - 100 - to3 - t metal to3 10v - 55c to +225c cht - ldns - 100 cht - ldns - 100 - to254 - t metal to254 10v - 55c to +225c cht - ldns - 100 cht - ldns - 120 - to3 - t metal to3 12v - 55c to +225c cht - ldns - 120 cht - ldns - 120 - to254 - t metal to254 12v - 55c to +225c cht - ldns - 120 cht - ldns - 130 - to3 - t metal to3 13v - 55c to +225c cht - ldns - 130 cht - ldns - 130 - to254 - t metal to254 13v - 55c to +225c cht - ldns - 130 cht - ldns - 150 - to3 - t metal to3 15v - 55c to +225c cht - ldns - 150 cht - ldns - 150 - to254 - t metal to254 15v - 55c to +225c cht - ldns - 150 v i n v o u t g n d ( c a s e ) g n d v i n v o u t c a s e f l o a t i n g
10 - nov - 10 contact : gonzalo picn (+32 - 10 - 489214) nov. 10 cht - ldns - datasheet (last modification date) public doc. ds - 100613 v 1 . 3 www.cissoid.com 7 of 7 package dimensions drawing to254 (mm +/ - 10% ) drawing to3(mm +/ - 10% ) contact & ordering cissoid s.a. headquarters and contact emea: cissoid s.a. C rue francqui, 3 C 1435 mont saint guibert - belgium t : +32 10 48 92 10 - f: +32 10 88 98 75 email: sales@cissoid.com sales representatives: visit our website: http://www.cissoid.com disclaimer neither cissoid, nor any of its directors, employees or affiliates make any representations or extend any warranties of any kind, either express or implied, including but not limited to warranties of merchantability, fitness for a particular purpose, and the absence of latent or other defects, whether or not discoverable. in no event shall cissoid, its d i- rectors, employees and affili ates be liable for direct, indirect, special, incidental or consequential damages of any kind arising out of the use of its circuits and their documentation, even if they have been advised of the possibility of such a damage. the circuits are provided as is. cissoid has no obligation to provide maintenance, support, updates, or modifications. 1 7 . 1 5 2 0 . 1 9 1 3 . 7 2 1 3 . 7 2 ? 3 . 6 5 1 . 1 6 3 . 8 1 2 5 . 4 0 6 . 5 2 ? 1 . 0 2 3 . 1 8 3 8 . 4 0 ? 1 9 . 5 0 ? 2 3 . 1 0 ? 2 5 . 5 0 ? 4 . 2 0 ? 4 . 2 0 4 . 2 0 * 2 3 9 . 2 0 1 9 . 5 0 1 . 5 8 5 . 9 1 1 2 . 0 0 1 6 . 9 0 - 1 7 . 0 5 3 0 . 1 5 1 0 . 7 0 - 1 0 . 8 5 ? 1 . 0 0
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