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? 2006 microchip technology inc. ds21484c-page 1 tc962 features: ? pin compatible with tc7662/icl7662/si7661 ? high output current 80 ma ? no external diodes required ? wide operating range 3v to 18v ? low output impedance 28 typ. ? no low voltage terminal required ? application zener on-chip ? osc frequency doubling pin option for smaller output capacitors applications: ? laptop computers ?disk drives ? process instrumentation ? p-based controllers device selection table general description: the tc962 is an advanced version of the industry standard tc7662 high voltage dc-to-dc converter. using improved design techniques and cmos construction, the tc962 can source as much as 80 ma versus the 7662?s 20 ma capability. as an inverter, the tc962 can put out voltages as high as 18v and as low as 3v without the need for external diodes. the output impedance of the device is a low 28 (with the proper capacitors), voltage conversion efficiency is 99.9%, and power conversion efficiency is 97%. the low voltage terminal (pin 6) required in some tc7662 applications has been eliminated. grounding this terminal will double the oscillator frequency from 12 khz to 24 khz. this will allow the use of smaller capacitors for the same output current and ripple, in most applications. only two external capacitors are required for inverter applications. in the event an external clock is needed to drive the tc962 (such as paralleling), driving this pin directly will cause the internal oscillator to sync to the external clock. pin 1, which is used as a test pin on the 7662, is a voltage reference zener on the tc962. this zener (6.4v at 5 ma) has a dynamic impedance of 12 and is intended for use where the tc962 is supplying current to external regulator circuitry and a reference is needed for the regulator circuit. (see section 3.0 ?applications information? applications information ). the tc962 is compatible with the ltc1044, si7661 and icl7662. it should be used in designs that require greater power and/or less input to output voltage drop. it offers superior performance over the icl7660s. package type part number package operating temp. range tc962coe 16-pin soic wide 0c to +70c tc962cpa 8-pin plastic dip 0c to +70c tc962epa 8-pin plastic dip -40c to +85c tc962ija 8-pin cerdip -25c to +85c tc962mja 8-pin cerdip -55c to +125c v dd 1 2 3 4 5 6 7 8 16 13 12 11 10 9 nc gnd c osc nc 15 14 nc nc nc tc962coe nc nc zener cathode nc freq x 2 16-pin soic wide c + c ? v out 1 2 3 4 8 7 6 5 freq x 2 gnd tc962cpa tc962epa tc962ija tc962mja c + c ? v out 8-pin cerdip 8-pin dip ? zener cathode c osc v dd high current charge pump dc-to-dc converter
tc962 ds21484c-page 2 ? 2006 microchip technology inc. functional block diagram + ? comparator with hysteresis c f/f q q v ref level shift level shift level shift level shift v dd p sw1 cap c p external n sw4 n sw2 n sw3 cap c r ext r l v out i i osc/c ? timing zener cathode freq x 2 + gnd ? 8 2 3 out 5 4 7 1 6.4v 6 + + tc962
? 2006 microchip technology inc. ds21484c-page 3 tc962 1.0 electrical characteristics absolute maximum ratings* supply voltage (v dd to gnd) ..............................+18v input voltage any pin ......................... (v dd +0.3) to (v ss -0.3) (note 1) current into any pin........................................... 10 ma esd protection ................................................ 2000v output short circuit ........... continuous (at 5.5v input) package power dissipation (t a 70c) soic ....................................................... 760 mw pdip........................................................ 730 mw cerdip .................................................. 800 mw package thermal resistance cerdip, r j-a ......................................... 90c/w pdip, r j-a ............................................ 140c/w operating temperature range cpa, coe ....................................... 0c to +70c ija ................................................ -25c to +85c epa .............................................. -40c to +85c mja ............................................ -55c to +125c storage temperature range ............. -65c to +150c *stresses above those listed under ?absolute maximum ratings? may cause permanent damage to the device. these are stress ratings only and functional operation of the device at these or any other conditions above those indicated in the operation sections of the specifications is not implied. exposure to absolute maximum rating conditions for extended periods may affect device reliability. tc962 electrical specifications electrical characteristics: v dd = 15v, t a = 25c (see figure ) unless otherwise noted. symbol parameter min typ max units test conditions v dd supply voltage 3 ? 18 v i s supply current v dd = 15v v dd = 5v ? ? ? ? ? ? ? ? 510 560 650 190 210 210 ? 700 ? ? ? ? ? ar l = t a = +25c 0 t a + 70c -55c t a + 125c t a = +25c 0 t a + 70c -55c t a + 125c r o output source resistance ? ? ? 32 35 ? 37 40 50 i l = 20 ma, v dd = 15v i l = 80 ma, v dd = 15v i l = 3 ma, v dd = 5v f osc oscillator frequency ? ? 12 24 ? ? khz pin 6 open pin 6 gnd p eff power efficiency 93 ? 97 ? ? ? %r l = 2 k v def voltage efficiency 99 ? 96 99.9 ? ? ? ? ? %r l = over temperature range v z zener voltage 6.0 6.2 6.4 v i z = 5 ma z zt zener impedance ? 12 ? i l = 2.5 ma to 7.5 ma note 1: connecting any input terminal to voltages greater than v + or less than gnd may cause destructive latch-up. it is recommended that no inputs from sources operating from external supplies be applied prior to ?power-up? of the tc962.
tc962 ds21484c-page 4 ? 2006 microchip technology inc. 2.0 pin descriptions the descriptions of the pins are listed in table 2-1. table 2-1: pin function table pin no. (8-pin dip) (8-pin cerdip) symbol description 1 zener cathode cathode of internal zener diode. 2c + positive side of external cp capacitor (pump cap). 3 gnd ground terminal. 4c - negative side of external cp capacitor (pump cap). 5v out output voltage. 6 freq x 2 if grounded, frequency doubles. 7c osc capacitor to gnd will decrease frequency. 8v dd input voltage. pin no. (16-pin soic) symbol description 1 zener cathode cathode of internal zener diode. 2 nc no connect. 3c + positive side of external cp capacitor (pump cap). 4 nc no connect. 5 gnd ground terminal. 6 nc no connect. 7c - negative side of external cp capacitor (pump cap). 8 nc no connect. 9 nc no connect. 10 v out output voltage. 11 nc no connect. 12 freq x 2 if grounded, frequency doubles. 13 nc no connect. 14 c osc capacitor to gnd will decrease frequency. 15 nc no connect. 16 v dd input voltage.
? 2006 microchip technology inc. ds21484c-page 5 tc962 3.0 applications information 3.1 theory of operation the tc962 is a capacitive pump (sometimes called a switched capacitor circuit), where four mosfet switches control the charge and discharge of a capacitor. the functional block diagram shows how the switching action works. sw1 and sw2 are turned on simulta- neously, charging c p to the supply voltage, v in . this assumes that the on resistance of the mosfets in series with the capacitor results in a charging time (3 time constants) that is less than the on time provided by the oscillator frequency as shown: 3 (r ds(on) c p ) < c p /(0.5 f osc ) in the next cycle, sw1 and sw2 are turned off and after a very short interval of all switches being off (this prevents large currents from occurring due to cross conduction), sw3 and sw4 are turned on. the charge in c p is then transferred to c r , but with the polarity inverted . in this way, a negative voltage is now derived. an oscillator supplies pulses to a flip-flop that is then fed to a set of level shifters. these level shifters then drive each set of switches at one-half the oscillator frequency. the oscillator has two pins that control the frequency of oscillation. pin 7 can have a capacitor added that is returned to ground. this will lower the frequency of the oscillator by adding capacitance to the timing capacitor internal to the tc962. grounding pin 6 will turn on a current source and double the frequency. this will double the charge current going into the internal capacitor, as well as any capacitor added to pin 7. a zener diode has been added to the tc962 for use as a reference in building external regulators. this zener runs from pin 1 to ground. 3.2 latch-up all cmos structures contain a parasitic scr. care must be taken to prevent any input from going above or below the supply rail, or latch-up will occur. the result of latch-up is an effective short between v dd and v ss . unless the power supply input has a current limit, this latch-up phenomena will result in damage to the device. ( see an763, latch-up protection for mosfet drivers .) figure 3-1: test c ircu it figure 3-2: typical applications tc962 1 2 3 4 8 690 7 5 c p + 10 f c osc r l v out (?5v) 10 f c r i l i s v (+5v) + nc + 1 2 3 tc962 4 8 7 6 5 c p2 c p1 c r1 10 f v + + + + 10 f v out = ?v + v d1 v d2 v out = + 10 f combined negative converter and positive multiplier + c p 10 f + 1 2 3 4 8 7 6 5 10 f c r + v out = v 2 + split v + in half tc962 positive voltage multiplier lowering output resistance by paralleling devices 2v ?2v d tc962 1 2 3 4 8 7 6 5 10 f 10 f v out = + v d2 v d1 + + v + c p c p 2v ?2v d c p1 10 f + c p2 10 f + tc962 tc962 1 2 3 4 8 7 6 5 1 2 3 4 8 7 6 5 + v + v out 10 f c r v +
tc962 ds21484c-page 6 ? 2006 microchip technology inc. 4.0 typical characteristics circuit of figure , c p = c r = 10 f, c pesr c resr 1 . note: the graphs and tables provided following this note are a statistical summary based on a limited number of samples and are provided for informational purposes only. the performance characteristics listed herein are not tested or guaranteed. in some graphs or tables, the data presented may be outside the specified operating range (e.g., outside specified power supply range) and therefore outside the warranted range. 700 600 500 400 300 200 100 -60 -40 -20 0 20 40 60 80 100 120 140 temperature (c) -60 -40 -20 0 20 40 60 80 100 120 140 temperature (c) supply current ( a) supply current vs. temperature 0 10k 1k 100 1 10 100 1000 10,000 capacitance (pf) frequency (hz) oscillator frequency vs. c 10 osc t a = +25c 20 18 16 14 12 10 8 frequency (khz) frequency vs. temperature 6 v = 15v + v = 15v + c osc = freq x 2 = open -60 -40 -20 0 20 40 60 80 100 120 140 temperature (c) 80 70 60 50 40 30 20 output resistance ( ) output resistance vs. temperature 10 50 4.5 zener voltage (v) current (ma) current vs. zener voltage 4.0 5.5 6.0 6.5 7.0 40 30 20 10 0 100 load current (ma) power conversion efficiency (%) power conversion efficiency vs. i 16 32 48 64 80 80 60 40 20 90 70 50 30 10 0 824405672 load 150 120 90 60 30 135 105 75 45 15 0 supply current (ma) v = 5v i l = 3 ma + v = 15v i l = 20 ma + t a = +25c t a = +25c efficiency supply current 100 input voltage (v) output resistance ( ) output resistance vs. input voltage 4 8 12 16 20 80 60 40 20 90 70 50 30 10 2 6 10 14 18 0 110 t a = +25c 3 a 20 a
? 2006 microchip technology inc. ds21484c-page 7 tc962 5.0 packaging information 5.1 package marking information package marking data not available at this time. 5.2 taping form 5.3 package dimensions component taping orientation for 16-pin soic (wide) devices w pin 1 user direction of feed standard reel component orientation for 713 suffix device p package carrier width (w) pitch (p) part per full reel reel size 16-pin soic (w) 16 mm 12 mm 1000 13 in carrier tape, number of components per reel and reel size .400 (10.16) .370 (9.40) .300 (7.62) .230 (5.84) .065 (1.65) .045 (1.14) .055 (1.40) max. .020 (0.51) min. pin 1 .200 (5.08) .160 (4.06) .200 (5.08) .125 (3.18) .110 (2.79) .090 (2.29) .020 (0.51) .016 (0.41) .040 (1.02) .020 (0.51) .320 (8.13) .290 (7.37) .150 (3.81) min. 3 min. 8-pin cdip (narrow) .015 (0.38) .008 (0.20) .400 (10.16) .320 (8.13) dimensions: inches (mm)
tc962 ds21484c-page 8 ? 2006 microchip technology inc. package dimensions (continued) 3 min. pin 1 .260 (6.60) .240 (6.10) .045 (1.14) .030 (0.76) .070 (1.78) .040 (1.02) .400 (10.16) .348 (8.84) .200 (5.08) .140 (3.56) .150 (3.81) .115 (2.92) .110 (2.79) .090 (2.29) .022 (0.56) .015 (0.38) .040 (1.02) .020 (0.51) .015 (0.38) .008 (0.20) .310 (7.87) .290 (7.37) .400 (10.16) .310 (7.87) 8-pin plastic dip dimensions: inches (mm) 8 max. pin 1 .299 (7.59) .291 (7.40) .413 (10.49) .398 (10.10) .019 (0.48) .014 (0.36) .012 (0.30) .004 (0.10) .104 (2.64) .097 (2.46) .013 (0.33) .009 (0.23) .050 (1.27) .016 (0.40) .419 (10.65) .398 (10.10) .050 (1.27) typ. 16-pin soic (wide) dimensions: inches (mm)
? 2006 microchip technology inc. ds21484c-page 9 tc962 the microchip web site microchip provides online support via our www site at www.microchip.com. this web site is used as a means to make files and information easily available to customers. accessible by using your favorite internet browser, the web site contains the following information: ? product support ? data sheets and errata, application notes and sample programs, design resources, user?s guides and hardware support documents, latest software releases and archived software ? general technical support ? frequently asked questions (faq), technical support requests, online discussion groups, microchip consultant program member listing ? business of microchip ? product selector and ordering guides, latest microchip press releases, listing of seminars and events, listings of microchip sales offices, distributors and factory representatives customer change notification service microchip?s customer notification service helps keep customers current on microchip products. subscribers will receive e-mail notification whenever there are changes, updates, revisions or errata related to a specified product family or development tool of interest. to register, access the microchip web site at www.microchip.com, click on customer change notification and follow the registration instructions. customer support users of microchip products can receive assistance through several channels: ? distributor or representative ? local sales office ? field application engineer (fae) ? technical support ? development systems information line customers should contact their distributor, representative or field application engineer (fae) for support. local sales offices are also available to help customers. a listing of sales offices and locations is included in the back of this document. technical support is available through the web site at: http://support.microchip.com
tc962 ds21484c-page 10 ? 2006 microchip technology inc. reader response it is our intention to provide you with the best documentation possible to ensure successful use of your microchip prod- uct. if you wish to provide your comments on organization, clarity, subject matter, and ways in which our documentation can better serve you, please fax your comments to the technical publications manager at (480) 792-4150. please list the following information, and use this outline to provide us with your comments about this document. to : technical publications manager re: reader response total pages sent ________ from: name company address city / state / zip / country telephone: (_______) _________ - _________ application (optional): would you like a reply? y n device: literature number: questions: fax: (______) _________ - _________ ds21484c tc962 1. what are the best features of this document? 2. how does this document meet your hardware and software development needs? 3. do you find the organization of this document easy to follow? if not, why? 4. what additions to the document do you think would enhance the structure and subject? 5. what deletions from the document could be made without affecting the overall usefulness? 6. is there any incorrect or misleading information (what and where)? 7. how would you improve this document?
? 2006 microchip technology inc. ds21484c-page 11 information contained in this publication regarding device applications and the like is provided only for your convenience and may be superseded by updates. it is your responsibility to ensure that your application meets with your specifications. microchip makes no representations or warranties of any kind whether express or implied, written or oral, statutory or otherwise, related to the information, including but not limited to its condition, quality, performance, merchantability or fitness for purpose . microchip disclaims all liability arising from this information and its use. use of microchip devices in life support and/or safety applications is entirely at the buyer?s risk, and the buyer agrees to defend, indemnify and hold harmless microchip from any and all damages, claims, suits, or expenses resulting from such use. no licenses are conveyed, implicitly or otherwise, under any microchip intellectual property rights. trademarks the microchip name and logo, the microchip logo, accuron, dspic, k ee l oq , micro id , mplab, pic, picmicro, picstart, pro mate, powersmart, rfpic, and smartshunt are registered trademarks of micr ochip technology incorporated in the u.s.a. and other countries. amplab, filterlab, migratable memory, mxdev, mxlab, seeval, smartsensor and the embedded control solutions company are registered trademarks of microchip technology incorporated in the u.s.a. analog-for-the-digital age, app lication maestro, dspicdem, dspicdem.net, dspicworks, ecan, economonitor, fansense, flexrom, fuzzylab, in-circuit serial programming, icsp, icepic, linear active thermistor, mindi, miwi, mpasm, mplib, mplink, pickit, picdem, picdem.net, piclab, pictail, powercal, powerinfo, powermate, powertool, real ice, rflab, rfpicdem, select mode, smart serial, smarttel, total endurance, uni/o, wiperlock and zena are tr ademarks of microchip technology incorporated in the u.s.a. and other countries. sqtp is a service mark of mi crochip technology incorporated in the u.s.a. all other trademarks mentioned herein are property of their respective companies. ? 2006, microchip technology incorporated, printed in the u.s.a., all rights reserved. printed on recycled paper. note the following details of the code protection feature on microchip devices: ? microchip products meet the specification cont ained in their particular microchip data sheet. ? microchip believes that its family of products is one of the most secure families of its kind on the market today, when used i n the intended manner and under normal conditions. ? there are dishonest and possibly illegal methods used to breach the code protection feature. all of these methods, to our knowledge, require using the microchip produc ts in a manner outside the operating specif ications contained in microchip?s data sheets. most likely, the person doing so is engaged in theft of intellectual property. ? microchip is willing to work with the customer who is concerned about the integrity of their code. ? neither microchip nor any other semiconduc tor manufacturer can guarantee the security of their code. code protection does not mean that we are guaranteeing the product as ?unbreakable.? code protection is constantly evolving. we at microchip are co mmitted to continuously improvin g the code protection features of our products. attempts to break microchip?s code protection feature may be a violation of the digital millennium copyright act. if such acts allow unauthorized access to your software or other copyrighted work, you may have a right to sue for relief under that act. microchip received iso/ts-16949:2002 certification for its worldwide headquarters, design and wafer fabrication facilities in chandler and tempe, arizona, gresham, oregon and mountain view, california. the company?s quality system processes and procedures are for its picmicro ? 8-bit mcus, k ee l oq ? code hopping devices, serial eeproms, microperipherals, nonvolatile memory and analog products. in addition, microchip?s quality system for the design and manufacture of development systems is iso 9001:2000 certified.
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