1 ? fn3180.5 icl7663s cmos programmable micropower positive voltage regulator the icl7663s super programmable micropower voltage regulator is a low power, high efficiency positive voltage regulator which accepts 1.6v to 16v inputs and provides adjustable outputs from 1.3v to 16v at currents up to 40ma. it is a direct replacement for the industry standard icl7663b offering wider operating voltage and temperature ranges, improved output accuracy (icl7663sa), better temperature coefficient, guaranteed maximum supply current, and guaranteed line and load regulation. all improvements are highlighted in the electrical characteristics section. critical parameters are guaranteed over the entire commercial and industrial temperature ranges. the icl7663s/sa programmable output voltage is set by two external resistors. the 1% reference accuracy of the icl7663sa eliminates the need for trimming the output voltage in most applications. the icl7663s is well suited for battery powered supplies, featuring 4 a quiescent current, low v in to v out differential, output current sensing and logic input level shutdown control. in addition, t he icl7663s has a negative temperature coefficient output suitable for generating a temperature compensated display drive voltage for lcd displays. pinout icl7663s (pdip, soic) top view features ? guaranteed 10 a maximum quiescent current over all temperature ranges ? wider operating voltage range - 1.6v to 16v ? guaranteed line and load regulation over entire operating temperature range optional ? 1% output voltage accuracy (icl7663sa) ? output voltage programmable from 1.3v to 16v ? improved temperature coefficient of output voltage ? 40ma minimum output curr ent with current limiting ? output voltages with programmable negative temperature coefficients ? output shutdown via current-limit sensing or external logic level ? low input-to-output voltage differential ? improved direct replacement for industry standard icl7663b and other second-source products ? pb-free plus anneal available (rohs compliant) applications ? low-power portable instrumentation ? pagers ? handheld instruments ? lcd display modules ? remote data loggers ? battery-powered systems sense v out2 v out1 gnd 1 2 3 4 8 7 6 5 v in + v tc v set shdn data sheet july 21, 2005 caution: these devices are sensitive to electrosta tic discharge; follow proper ic handling procedures. 1-888-intersil or 1-888-468-3774 | intersil (and design) is a registered trademark of intersil americas inc. copyright ? intersil americas inc. 1999-2005. all rights reserved all other trademarks mentioned are the property of their respective owners.
2 fn3180.5 july 21, 2005 ordering information part number temp. range (c) package p k g. d w g. # icl7663scba* 0 to 70 8 ld soic (n) m8.15 icl7663scbaza* (see note) 0 to 70 8 ld soic (n) (pb-free) m8.15 icl7663scpa 0 to 70 8 ld pdip e8.3 icl7663scpaz (see note) 0 to 70 8 ld pdip** (pb-free) e8.3 icl7663sacba* 0 to 70 8 ld soic (n) m8.15 ICL7663SACBAZA* (see note) 0 to 70 8 ld soic (n) (pb-free) m8.15 icl7663sacpa 0 to 70 8 ld pdip e8.3 icl7663saiba -25 to 85 8 ld soic (n) m8.15 icl7663saibaza (see note) -25 to 85 8 ld soic (n) (pb-free) m8.15 *add ?-t? suffix to part number for tape and reel packaging. **pb-free pdips can be used for through hole wave solder processing only. they are not intended for use in reflow solder processing applications. note: intersil pb-free plus anneal products employ special pb-free material sets; molding compounds/die attach materials and 100% matte tin plate termination finish, which are rohs compliant and compatible with both snpb and pb-free soldering operations. intersil pb-free products are msl classified at pb-free peak reflow temperatures that meet or exceed the pb-free requirements of ipc/jedec j std-020. icl7663s
3 fn3180.5 july 21, 2005 absolute maximum rati ngs thermal information input supply voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .+18v any input or output voltage (note 1) terminals 1, 2, 3, 5, 6, 7 . . . . . . . . . . . . . v in + 0.3v to gnd -0.3v output source current terminal 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50ma terminal 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25ma output sinking current terminal 7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -10ma operating conditions temperature range icl7663sc. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0c to 70c icl7663si . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .-25c to 85c thermal resistance (typical, note 2) ja (c/w) jc (c/w) cerdip package. . . . . . . . . . . . . . . . . 115 30 pdip package* . . . . . . . . . . . . . . . . . . 150 n/a plastic soic package . . . . . . . . . . . . . 180 n/a maximum junction temperature pdip package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 150 c cerdip package. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 175 c maximum storage temperature range . . . . . . . . . . -65 c to 150 c maximum lead temperature (soldering 10s) . . . . . . . . . . . . . 300 c (soic - lead tips only) * pb-free pdips can be used for through hole wave solder processing only. they are not intended for use in reflow solder processing applications. caution: stresses above those listed in ?absolute maximum ratings? may cause permanent damage to the device. this is a stress o nly rating and operation of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied. notes: 1. connecting any terminal to voltages greater than (v+ in + 0.3v) or less than (gnd - 0.3v) may cause destructive dev ice latch-up. it is recommended that no inputs from sources operating on exter nal power supplies be applied prior to icl7663s power-up. 2. ja is measured with the component mount ed on an evaluation pc board in free air. electrical specifications specifications below applicable to both icl7663s and icl7663sa, unless otherwise specified. v+ in = 9v, v out = 5v, t a = 25c, unless otherwise specified. notes 4, 5. see test circuit, figure 7 parameter symbol test conditions min typ max units input voltage v+ in icl7663s t a = 25c 1.5 - 16 v 0c < t a < 70c 1.6 - 16 v -25c < t a < 85c 1.6 - 16 v icl7663sa 0c < t a < 70c 1.6 - 16 v -25c < t a < 85c 1.6 - 16 v quiescent current i q 1.4v v out 8.5v, no load v+ in = 9v 0c < t a < 70c - - 10 a -25c < t a < 85c - - 10 a v+ in = 16v 0c < t a < 70c - - 12 a -25c < t a < 85c - - 12 a reference voltage v set i out1 = 100 a, v out = v set icl7663s t a = 25c 1.2 1.3 1.4 v icl7663sa t a = 25c 1.275 1.29 1.305 v temperature coefficient ? v set ? t 0c < t a < 70c - 100 - ppm -25c < t a < 85c - 100 - ppm line regulation ? v set v set? ? v in 2v < v in < 15v 0c < t a < 70c - 0.03 - %/v -25c < t a < 85c - 0.03 0.3 %/v v set input current i set 0c < t a < 70c - 0.01 10 na -25c < t a < 85c - 0.01 10 na shutdown input current i shdn - 0.01 10 na shutdown input voltage v shdn v shdn hi: both v out disabled 1.4 - - v v shdn lo: both v out enable - - 0.3 v sense pin input current i sense -0.0110na icl7663s
4 fn3180.5 july 21, 2005 functional diagram sense pin input threshold v cl -0.5- v input-output saturation resistance (note 3) r sat v+ in = 2v, i out1 = 1ma - 170 350 ? v+ in = 9v, i out1 = 2ma - 50 100 ? v+ in = 15v, i out1 = 5ma - 35 70 ? load regulation ? v out ? i out 1ma < i out2 < 20ma - 1 3 ? 50 a < i out1 < 5ma - 2 10 ? available output current (v out2 ) i out2 3v v in 16v, v in - v out2 = 1.5v 40 - - ma negative tempco output (note 4) v tc open circuit voltage - 0.9 - v i tc maximum sink current 0 8 2.0 ma temperature coefficient ? v tc ? t open circuit - +2.5 - mv/c minimum load current i l(min) includes v set divider t a = 25c - - 1.0 a 0c < t a < 70c - 0.2 5.0 a -25c < t a < 85c - 0.2 5.0 a notes: 3. this parameter refers to the saturation resistance of the mo s pass transistor. the minimum input-output voltage differential at low current (under 5ma), can be determined by multiplying the load current (including set resistor current, but not quiescent current) by this res istance. 4. this output has a positive temperature coef ficient. using it in combination with the inverting input of the regulator at v set , a negative coefficient results in the output voltage. see figure 9 for details. pin will not source current. 5. all pins are designed to withstand electrosta tic discharge (esd) levels in excess of 2000v. 6. all significant improvements over th e industry standard icl7663 are highlighted. electrical specifications specifications below applicable to both icl7663s and icl7663sa, unless otherwise specified. v+ in = 9v, v out = 5v, t a = 25c, unless otherwise specified. notes 4, 5. see test circuit, figure 7 (continued) parameter symbol test conditions min typ max units c ref b a v out1 v out2 sense v set v tc shutdown gnd 3 2 1 6 7 5 4 v+ in 8 gnd icl7663s
5 fn3180.5 july 21, 2005 typical performance curves figure 1. v out2 output voltage as a function of output current figure 2. v out1 input-output differential vs output current figure 3. v out2 input-output differential vs output current figure 4. nput power supply rejection ratio figure 5. quiescent current as a function of input voltage figure 6. quiescent current as a function of temperature 5.000 4.995 4.990 4.985 4.980 4.975 4.970 4.965 4.960 4.955 4.950 v out (v) 10 -2 10 -1 10 0 10 1 10 2 10 -3 i out (ma) t a = 25c v+ = 9.0v 2 . 0 1.8 1.6 1.4 1.2 1.0 0.8 0.6 0.4 0.2 0 02468101214161820 t a = 25c v+ in = 15v v+ in - v out 1 (v) i out1 (ma) v+ in = 9v v+ in = 2v i out2 (ma) v+ in - v out 1 (v) 2.0 1.8 1.6 1.4 1.2 1.0 0.8 0.6 0.4 0.2 0 0 5 10 15 20 25 30 35 40 45 50 v+ in = 9v t a = 25c v+ in = 2v v+ in = 15v 10 -2 10 -1 10 0 10 1 10 2 1k 100 90 80 70 60 50 40 30 20 10 0 psrr (db) frequency (hz) v in = 9.0v ? v in = 2v t a = -20c 5.0 4.5 4.0 3.5 3.0 2.5 2.0 1.5 1.0 0.5 0 0 2 4 6 8 10 12 14 16 v+ in (v) i o ( a) t a = -25c t a = -70c 5.00 4.75 4.50 4.25 4.00 3.75 3.50 3.25 3.00 2.75 2.50 i o ( a) v+ = 15v v+ = 9v v+ = 2v -20 0 20 40 60 80 temperature (c) icl7663s
6 fn3180.5 july 21, 2005 detailed description the icl7663s is a cmos integrated circuit incorporating all the functions of a voltage regula tor plus protection circuitry on a single monolithic chip. referring to the functional diagram, the main blocks are a bandgap-type voltage reference, an error amplifier, and an output driver with both pmos and npn pass transistors. the bandgap output voltage, trimmed to 1.29v 15mv for the icl7663sa, and the input voltage at the v set terminal are compared in amplifier a. error amplifier a drives a p-channel pass transistor which is sufficient for low (under about 5ma) currents. the high current output is passed by an npn bipolar transistor connected as a follower. this configuration gives more gain and lower output impedance. logic-controlled shutdown is im plemented via a n-channel mos transistor. current-sensing is achieved with comparator c, which functions with the v out2 terminal. the icl7663s has an output (v tc ) from a buffer amplifier (b), which can be used in combination with amplifier a to generate programmable-temper ature-coefficient output voltages. the amplifier, reference and comparator circuitry all operate at bias levels well below 1 a to achieve extremely low quiescent current. this does li mit the dynamic response of the circuits, however, and transients are best dealt with outside the regulator loop. basic operation the icl7663s is designed to regulate battery voltages in the 5v to 15v region at maximum load currents of about 5ma to 30ma. although intended as low power devices, power dissipation limits must be observed. for example, the power dissipation in the case of a 10v supply regulated down to 2v with a load current of 30ma clearly exceeds the power dissipation rating of the mini-dip: (10 - 2) (30) (10 -3 ) = 240mw the circuit of figure 8 illustrates proper use of the device. cmos devices generally require two precautions: every input pin must go somewhere, and maximum values of applied voltages and current limits must be rigorously observed. neglecting these pr ecautions may lead to, at the least, incorrect or nonoperation, and at worst, destructive device failure. to avoid the prob lem of latchup, do not apply inputs to any pins before supply voltage is applied. input voltages - the icl7663s accepts working inputs of 1.5v to 16v. when power is applied, the rate-of-rise of the input may be hundreds of volts per microsecond. this is potentially harmful to the regulators, where internal operating currents are in the nanoampere range. the 0.047 f capacitor on the device side of the switch will limit inputs to a safe level around 2v/ s. use of this capacitor is suggested in all applications. in severe rate-of-rise cases, it may be advisable to use an rc network on the shutdown pin to delay output turn-on. battery charging surges, transients, and assorted noise signals should be kept from the regulators by rc filterin g, zener protection, or even fusing. output voltages - the resistor divider r 2 /r 1 is used to scale the reference voltage, v set , to the desired output using the formula v out = (1 + r 2 /r 1 ) v set . suitable arrangements of these resist ors, using a potentiometer, enables exact values for v out to be obtained. in most applications the potentiometer may be eliminated by using the icl7663sa. the icl7663sa has v set voltage guaranteed to be 1.29v 15mv and when used with 1% tolerance resistors for r 1 and r 2 the initial output voltage will be within 2.7% of ideal. the low leakage current of the v set terminal allows r 1 and r 2 to be tens of megohms for minimum additional quiescent drain current. however, some load current is required for proper operation, so for extrem ely low-drain applications it is necessary to draw at least 1 a. this can include the current for r 2 and r 1 . output voltages up to nearly the v in supply may be obtained at low load currents, while the low limit is the reference voltage. the minimum input-output differential in each regulator is obtained using the v out1 , terminal. the input- output differential increases to 1.5v when using v out2 . output currents - low output currents of less than 5ma are obtained with the least input- output differential from the v out1 terminal (connect v out2 to v out1 ). where higher currents are needed, use v out2 (v out1 , should be left open in this case). shdn v out2 v out1 v tc v set sense gnd 1 a min + - i q s 2 s 1 r cl r 2 r l c l r 1 (7663 only) v out on off s 3 1m ? 1.4v < v shdn < v+ in 0.047 f + - m notes: 7. s 1 when closed disables output current limiting. 8. close s 2 for v out1 , open s 2 for v out2 . 9. iq quiescent currents measured at gnd pin by meter m. 10. s 3 when on, permits normal operation, when off, shuts down both v out1 and v out2 . figure 7. icl7663s test circuit icl7663s
7 fn3180.5 july 21, 2005 high output currents can be obtai ned only as far as package dissipation allows. it is str ongly recommended that output current-limit sensing be used in such cases. current-limit sensing - the on-chip comparator (c in the functional diagram) permits shutdown of the regulator output in the event of excessive current drain. as figure 8 shows, a current-limiting resistor, r cl , is placed in series with v out2 and the sense terminal is connected to the load side of r cl . when the current through r cl is high enough to produce a voltage drop equal to v cl (0.5v) the voltage feedback is by-passed and the regulator output will be limited to this current. th erefore, when the maximum load current (i load ) is determined, simply divide v cl by i load to obtain the value for r cl . logic-controllable shutdown - when equipment is not needed continuously (e.g., in remote data-acquisition systems), it is desirable to e liminate its drain on the system until it is required. this usua lly means switches, with their unreliable contacts. instead, the icl7663s can be shut down by a logic signal, leaving only i q (under 4 a) as a drain on the power source. since this pin must not be left open, it should be tied to ground if not needed. a voltage of less than 0.3v for the icl7663s will keep the regulator on, and a voltage level of more than 1.4v but less than v+ in will turn the outputs off. if there is a possibility that the control signal could exceed the regulator input (v+ in ) the current from this signal should be limited to 100 a maximum by a high value (1m ? ) series resistor. this situation may occur when the logic signal origi nates from a system powered separately from that of the regulator. additional circuit precautions - this regulator has poor rejection of voltage fluctuations from ac sources above 10hz or so. to prevent the output from responding (where this might be a problem), a reservoir capacitor across the load is advised. the value of this capacitor is chosen so that the regulated output voltage reaches 90% of its final value in 20ms. from: in addition, where such a capacitor is used, a current-limiting resistor is also suggested (s ee ?current-limit sensing?). producing output voltages with negative temperature coefficients -the icl7663s has an additional output which is 0.9v relative to gnd and has a tempco of +2.5mv/c. by applying this voltage to the inverting input of amplifier a (i.e., the v set pin), output voltages having negative tc may be produced. the tc of the output voltage is controlled by the r 2 /r 3 ratio (see figure 9 and its design equations). applications boosting output current with external transistor the maximum available output cu rrent from the icl7663s is 40ma. to obtain output currents greater than 40ma, an external npn transistor is used connected as shown in figure 10. shdn v out2 v out1 v tc v set sense gnd r 2 c l v in 0.047 f v+ in 604k ? r cl 20 ? 210k ? r 1 10 f v out +5v figure 8. positive regulator with current limit v out = r 2 + r 1 r 1 v set = 5v i cl = v cl r cl = 25ma i = ? v c ,c ? t = i out (20 x 10 -3 ) 0.9v out = 0.022 i out v out v ref v set - + v tc - + r 1 r 2 v out r 3 - + w here:v set = 1.3v v tc = 0.9v t cv tc = +2.5mv/c figure 9. generating negative temperature coefficients eq. 1: v out = v set ( r 2 1 + r 1 ) r 2 + r 3 (v set - v tc ) eq. 2: tc v out = r 2 - r 3 (tc v tc ) in mv/c shdn v out2 v out1 v set sense gnd v in 10 f v+ in 604k ? 100 ? 210k ? v out +5v 0.47 ? external pin power transistor figure 10. boosting output current with external transistor icl7663s
8 all intersil u.s. products are manufactured, asse mbled and tested utilizing iso9000 quality systems. intersil corporation?s quality certifications ca n be viewed at www.intersil.com/design/quality intersil products are sold by description only. intersil corpor ation reserves the right to make changes in circuit design, soft ware and/or specifications at any time without notice. accordingly, the reader is cautioned to verify that data sheets are current before placing orders. information furnishe d by intersil is believed to be accurate and reliable. however, no responsibility is assumed by intersil or its subsidiaries for its use; nor for any infringements of paten ts 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 intersil or its subsidiari es. for information regarding intersil corporation and its products, see www.intersil.com fn3180.5 july 21, 2005 generating a temperature compensated display drive voltage temperature has an important effect in the variation of threshold voltage in multiplexed lcd displays. as temperature rises, the threshold voltage goes down. for applications where the display temperature varies widely, a temperature compensated display voltage, v disp , can be generated using the icl7663s. this is shown in figure 11 for the icm7233 triplexed lcd display driver. v out2 v out1 v set gnd v+ in v tc v disp icm7233 icl7663s gnd data bus v+ +5v 1.8m ? 300k ? 2.7m ? logic system, processor, etc. gnd figure 11. generating a multiplexed lcd display drive voltage icl7663s
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