l9444vb/L9448VB l9480vb one chip car alternator regulator advance data no external components precise temperature coefficient precise regulated voltage high output current short circuit protected reverse battery protection + 80 v load dump protection low energy spike protection thermal shutdown very low start up voltage description the devices are a "single function" self-oscillating voltage regulator for car alternators. integrating both the control section and the output power stage on a single chip, the devices require no ex- ternal components, reducing significantly the cost of the system and increasing reliability. this is advanced information on a new product now in development or undergoing evaluation. details are subject to change without notice. october 1992 block diagram to220 ordering number: l9444vb L9448VB l9480vb 1/5
pin connection (top view) absolute maximum ratings symbol parameter value unit v s transient overvoltage : load dump : 5ms t rise 10ms, t f fall time constant 100ms, r source 3 0.5 w 80 v i clamp current into low energy clamping zener (t rise = 5 m s ; t decay 2ms ; duty cycle 5%) 100 ma i out maximum output current 5.5 a t j , t stg junction and storage temperature range C 55 to + 150 c thermal data symbol parameter value unit r th i-case thermal resistance junction-case max. 3 c/w device operation the alternator voltage, rectified by the auxiliary di- ode trio, is compared with an external reference and the resulting signal switches the output stage, driving the alternator field coil. as the regulator is a self-oscillating type, the switching frequency depends on the whole sys- tem parameter set (including the alternator char- acteristics). the regulator has an integrated filter in the volt- age sensing path. consequently it doesnt need - in the standard application- any external compo- nent. anyway an external capacitor (0.1 - 1 m f) must be inserted between v s and ground guaranteeing the correct behaviour of the device when the rec- tifying diodes feature very high switching spikes that are not filtered by the devices. this external capacitor must also be used when the impedances of the cables connecting the al- ternator to the battery are so high to cause a su- perimposed ripple on the alternator voltage higher than 3-4v. the devices regulation voltage and the tempera- ture coefficient may be independently set by suited metal mask selections ; furthermore the regulation voltage is trimmed within 1% of the nominal value @ 25c. the devices have an unique -and patented- sys- tem to compensate the self-heating of the die due to the power dissipated in the output stage. in this way the internal reference voltage tracks the case temperature rather than the die one. the device can withstand the reverse battery and the load dump (up to 80v) ; they can absorb, into the internal clamping zeners, low energy spikes up to a level of 100ma and its output is short cir- cuit protected. finally the internal thermal shutdown avoids any possible device damage due to overtemperature problems. l9444vb -L9448VB - l9480vb 2/5
electrical characteristics (C 40 c t j 125 c unless otherwise noted) symbol parameter test conditions min. typ. max. unit v r regulation voltage t j = C40 c for l9444vb for L9448VB for l9480vb 14.49 14.36 14.75 14.79 14.66 15.05 15.05 14.96 15.35 v v v t j = 25 c 14.10 14.40 14.70 v t j = 125 c for l9444vb for L9448VB for l9480vb 13.50 13.70 13.10 13.80 14.00 13.40 14.10 14.30 13.70 v v v c t temperature coeff. of the regulation voltage for l9444vb for L9448VB for l9480vb - 6 - 4 - 10 mv/ c mv/ c mv/ c ec t error on nominal temperature coeff. 30 % v r load regualtion 0.1 i n < i alt < 0.9 i n (note 1) 250 mv v su control circuit minimum start up voltage measured at supply pin 2 3 v v sd shutdown voltage (dump protection threshold) 22 v v sat 1 output saturation voltage i field = 4 a p 1.2 2 v v sat 2 start up saturation voltage i field = 200 ma 0.7 1 v i q quiescent current field off 20 ma i s supply current i field = 4 a p 50 ma i fs field pin sink current field off field pin @ 16 v 5ma v 1 clamp low energy clamping zener voltage i clamp = 50 ma 120 v f sw switching frequency 01 i n < i alt < 0.9 i n 30 1000 hz note1: measured on an alternator with the following characteristics: i n =<90a; i alt /i field >= 23 application circuit l9444vb - L9448VB - l9480vb 3/5
to220 package mechanical data dim. mm inch min. typ. max. min. typ. max. a 4.8 0.189 c 1.37 0.054 d 2.4 2.8 0.094 0.110 d1 1.2 1.35 0.047 0.053 e 0.35 0.55 0.014 0.022 f 0.8 1.05 0.031 0.041 f2 1.15 1.4 0.045 0.055 g 4.95 5.08 5.21 0.195 0.200 0.205 h2 10.4 0.409 h3 10.05 10.4 0.396 0.409 l2 16.2 0.638 l3 26.3 26.7 27.1 1.035 1.051 1.067 l5 2.6 3 0.102 0.118 l6 15.1 15.8 0.594 0.622 l7 6 6.6 0.236 0.260 dia 3.65 3.85 0.144 0.152 l9444vb -L9448VB - l9480vb 4/5
information furnished is believed to be accurate and reliable. however, sgs-thomson microelectronics assumes no responsibility for the consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. no license is granted by implication or otherwise under any patent or patent rights of sgs-thomson microelectronics. specifications men- tioned in this publi cation are subject to change without not ice. this publication sup ersedes and replaces all information previously supplied. sgs-thomson microelectronics products are not authorized for use as critical components in life support dev ices or systems without ex- press written approval of sgs-thomson microelectronics. ? 1994 sgs-thomson microelectronics - all rights reserved sgs-thomson microelectronics group of companies aust ralia - brazil - france - germany - hong kong - italy - japan - korea - malaysia - malta - morocco - the netherlands - singapore - spain - sweden - switzerland - taiwan - thaliand - united k ingdom - u.s.a. l9444vb - L9448VB - l9480vb 5/5
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