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l4936n/nh june 2000 dual multifunction voltage regulator ? . standby output voltage precision 5v 2% . output 2 tracked to the standby out- put . output 2 disable function for standby mode . very low quiescent current, less than 250 m a, in standby mode . output 2 voltage settable from 5 to 20v . output currents : i 01 = 50ma, i 02 = 500ma . very low dropout (max 0.4v/0.6v) . operating transient supply voltage up to 40v . power-on reset circuit sensing the standby output voltage . power-on reset delay pulse defined by the external capacitor . early warning output for supply un- dervoltage . thermal shutdown and short circuit protections multiwatt 15 ordering numbers: l4936n (multiwatt 11) L4936NH (multiwatt 15) description thel4936n/nh are monolithic integrated dual volt- age regulators with two very low dropout outputs and additional functions such as power-on reset and input voltage sense. they are designed for supply- ing microcomputer controlled systems specially in automotive applications. pin connection (top view) multiwatt 11 1 2 3 4 5 6 7 9 10 11 8 out2 adj out1 so res gnd en ct n.c. si vs1/vs2 tab connected to pin 6 d94at154 1 2 3 4 5 6 7 9 10 11 8 n.c. n.c. res gnd en n.c. ct n.c. si vs1 vs2 tab connected to pin 6 13 14 15 12 out2 adj out1 so d95at155 1/11
block diagram reg1 1.23v reference reg2 reset 2.0v 1.23v 1.23v sense (optional) v s1 v s2 en si so res ct adj v o2 v o1 gnd d94at143a 2 m thermal data symbol parameter value unit r thj-case thermal resistance junction-case max. 3 c/w note: vs1, vs2, si pins are rated at 1500v versus positive esd according to human body model; other pins are rated at 2000v. l4936n/nh 2/11
absolute maximum ratings symbol parameter value unit v s dc supply voltage 28 v transient supply voltage (t < 1s) 40 v t j , t stg junction and storage temperature range C55 to 150 c i si sense input current (v si 0.3v or v si > v s ) 1 ma i en enable input current (v en 0.3v) C 1 ma v en enable input voltage v s v res , v so reset and sense output voltage 20 v i res , i so reset and sense output current 5 ma p d power dissipation (t a = 80 c, r th heatsink = 11 c/w) mw11 powerdip 5 1166 w mw reg1 1.23v reference reg2 reset 2.0v 1.23v 1.23v sense (optional) v s1 v s2 en si so res ct adj v o2 v o1 gnd d94at144a c s ct c o2 c o1 r res r so 2 m v o1 application circuit c s 3 1 m f ; c 01 3 6 m f ; c 02 3 10 m f, esr < 10 w at 10khz note : the circuit is esd protected according to milCstdC883c. l4936n/nh 3/11
electrical characteristics (v s = 14v; C40 c unless otherwise specified) symbol parameter test conditions min. typ. max. unit v s operating supply voltage 25 v v o1 standby output voltage 6v v s 25v 1ma i o1 50ma 4.90 5.00 5.10 v v o2 - v o1 output voltage 2 tracking error (note 1) 6v v s 25v 5ma i o2 500ma enable = low C25 +25 mv i adj adj input current i o1 = 1ma; i o2 = 5ma C1 0.1 1 m a v dp1 dropout voltage 1 i o1 = 10ma i o1 = 50ma 0.1 0.2 0.25 0.4 v v v io1 input to output voltage difference in undervoltage condition vs = 4v, i o1 = 35ma 0.4 v v dp2 dropout voltage 2 io1 = 100ma i o1 = 500ma 0.2 0.3 0.3 0.6 v v v io2 input to output voltage difference in undervoltage condition vs = 4.6v, i o1 = 350ma 0.6 v v ol 1.2 line regulation 6v v s 25v i o2 = 1ma; i o2 = 5ma 20 mv v olo1 load regulation 1 1ma i o1 50ma 25 mv v olo2 load regulation 2 5ma i o2 500ma 50 mv i lim1 current limit 1 v o1 = 4.5v v o1 = 0v (note 2) 55 25 100 50 200 100 ma ma i lim2 current limit 2 vo2 = 0v 550 1000 1700 ma i qsb quiescent current standby mode (output 2 disabled) i o1 = 0.3ma; t j < 100 c v en 3 2.4v v s = 14v v s = 3.5v 210 340 290 850 m a m a i q quiescent current i o1 = 50ma i o1 = 500ma 30 ma enable v enl enable input low voltage (output 2 active) C0.3 1.5 v v enh enable input high voltage 2.4 7 v v enhyst enable hysteresis 30 75 200 mv i en enable input current 0v < v en < 1.2v 2.5v < v en < 7v C10 C1 C1.5 0 C0.5 +1 m a m a l4936n/nh 4/11
functional description the l4936n/nh are based on the sgs-thomson microelectronics modular voltage regulator ap- proach. several out-standing features and auxiliary functions are provided to meet the requirements of supplying the microprocessor systems used in auto- motive applications. furthermore the device is suitable also in other ap- plications requiring two stabilized voltages. the modular approach allows other features and functions to be realized easily when required. standby regulator the standby regulator uses an isolated collector vertical pnp transistor as the regulating element. this structure allows a very low dropout voltage at currents up to 50ma. the dropout operation of the standby regulator is maintained down to 2v input supply voltage. the output voltage is regulated up to the transient input supply voltage of 40v. this fea- ture avoids functional interruptions which could be generated by overvoltage pulses. the typical curve of the standby output voltage as a function of the input supply voltage is shown in fig. 1. the current consumption of the device (quiescent current) is less than 250 m a when output 2 is dis- abled (standby mode). the dropout voltage is con- trolled to reduce the quiescent current peak in the undervoltage region and to improve the transient response in this region. the quiescent current is shown in fig. 2 as a function of the supply input voltage 2. output 2 voltage the output 2 regulator uses the same output struc- ture as the standby regulator, but rated for an output current of 500ma. the output 2 regulator works in tracking mode with the standby output voltage as a reference voltage when the output 2 programming pin adj is con- nected to v o2 . by connecting a resistor divider r 1 , r 2 to the pin adj as shown in fig. 3, the output volt- age 2 can be programmed to the value : v o2 = v o1 (1 + r 1 /r 2 ) the output 2 regulator can be switched off via the enable input. note : 1 : v o2 connected to adj.v o2 can be set to higher values by inserting an external resistor divider. 2 : foldback characteristic electrical characteristics (continued) reset symbol parameter test conditions min. typ. max. unit v rt reset low threshold voltage v s = 14v v o1 -0.4 4.7 v o1 -0.1 v v rth reset threshold hysteresis 50 100 200 mv t rd reset pulse delay c t = 100nf; t r > 100 m s 55 100 180 mv t rr reset reaction time c t = 100nf 1 0 50 m s v rl reset output low voltage r res = 10k w to v 01 v s = 1.5v 0.4 v i lres reset output high leakage v res = 5v 1 m a v cth delay comparator threshold 2.0 v v cth, hyst delay comparator threshold hysteresis 100 mv sense v slth sense threshold voltage 1.16 1.23 1.35 v v slth, hyst sense threshold hysteresis 20 100 200 mv v sol sense output low voltage v si = 0.8v; v s 3 3v r so = 10k w to v 01 0.4 v i lso sense output leakage v so = 5v; vsi 3 1.5v 1 m a l4936n/nh 5/11
figure 2 : quiescent current vs. supply voltage. figure 3 : programmable output 2 voltage with external resistors. figure 1 : output voltage vs. input voltage. l4936n/nh 6/11
reset circuit the block circuit diagram of the reset circuit is shown in fig. 4. the reset circuit supervises the standby out- put voltage. the reset threshold of 4.7v is defined by the internal reference voltage and the standby output divider. the reset pulse delay time t rd , is defined by the charge time of an external capacitor c t : c t x 2v t rd = 2 m a the reaction time of the reset circuit depends on the discharge time limitation of the reset capacitor c t and is proportional to the value of c t . the reaction time of the reset circuit increases the noise immunity. in fact, if the standby output voltage drops below the reset threshold for a time shorter than the reaction time t rr , no reset output variation occurs. the nominal reset delay is generated for standby output voltage drops longer than the time necessary for the complete discharging of the ca- pacitor c t . this time is typically equal to 50 m s if c t = 100nf. the typical reset output waveforms are shown in fig. 5. sense comparator this circuit compares an input signal with an internal voltage reference of typically 1.23v. the use of an external voltage divider makes the comparator very flexible in the application. this function can be used to supervise the input voltage - either before or after the protection diode - and to give additional informa- tion to the microprocessor such as low voltage warn- ings. figure 4 : block diagram of the reset circuit. l4936n/nh 7/11
figure 5 : typical reset output waveforms. 1.5v l4936n/nh 8/11
multiwatt11 v dim. mm inch min. typ. max. min. typ. max. a 5 0.197 b 2.65 0.104 c 1.6 0.063 d 1 0.039 e 0.49 0.55 0.019 0.022 f 0.88 0.95 0.035 0.037 g 1.45 1.7 1.95 0.057 0.067 0.077 g1 16.75 17 17.25 0.659 0.669 0.679 h1 19.6 0.772 h2 20.2 0.795 l 21.9 22.2 22.5 0.862 0.874 0.886 l1 21.7 22.1 22.5 0.854 0.87 0.886 l2 17.4 18.1 0.685 0.713 l3 17.25 17.5 17.75 0.679 0.689 0.699 l4 10.3 10.7 10.9 0.406 0.421 0.429 l7 2.65 2.9 0.104 0.114 m 4.25 4.55 4.85 0.167 0.179 0.191 m1 4.73 5.08 5.43 0.186 0.200 0.214 s 1.9 2.6 0.075 0.102 s1 1.9 2.6 0.075 0.102 dia1 3.65 3.85 0.144 0.152 outline and mechanical data l4936n/nh 9/11
dim. mm inch min. typ. max. min. typ. max. a 5 0.197 b 2.65 0.104 c 1.6 0.063 e 0.49 0.55 0.019 0.022 f 0.66 0.75 0.026 0.030 g 1.14 1.27 1.4 0.045 0.050 0.055 g1 17.57 17.78 17.91 0.692 0.700 0.705 h1 19.6 0.772 h2 20.2 0.795 l 20.57 0.810 l1 18.03 0.710 l2 2.54 0.100 l3 17.25 17.5 17.75 0.679 0.689 0.699 l4 10.3 10.7 10.9 0.406 0.421 0.429 l5 5.28 0.208 l6 2.38 0.094 l7 2.65 2.9 0.104 0.114 s 1.9 2.6 0.075 0.102 s1 1.9 2.6 0.075 0.102 dia1 3.65 3.85 0.144 0.152 multiwatt15 h outline and mechanical data l4936n/nh 10/11
information furnished is believed to be accurate and reliable. however, stmicroelectronics assumes no responsib ility for the conse- quences of use of such information nor for any infringement of patents or other rights of third parties which may result from i ts use. no license is granted by implication or otherwise under any patent or patent rights of stmicroelectronics. specification mentioned in this publication are subject to change without notice. this publication supersedes and replaces all information previously supplied. stmi- croelectronics products are not authorized for use as critical components in life support devices or systems without express wr itten approval of stmicroelectronics. the st logo is a registered trademark of stmicroelectronics ? 2000 stmicroelectronics C printed in italy C all rights reserved multiwatt? is a registered trademark of stmicroelectronics stmicroelectronics group of companies australia - brazil - china - finland - france - germany - hong kong - india - italy - japan - malaysia - malta - morocco - singapore - spain - sweden - switzerland - united kingdom - u.s.a. http://www.st.com l4936n/nh 11/11

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