? 2005 microchip technology inc. ds21548c-page 1 tc2682/TC2683/tc2684 features ? small 8-pin msop package ? operates from 1.8v to 5.5v ? 120 ohms (typ) output resistance ? 99% voltage conversion efficiency ? only 3 external capacitors required ? power-saving shutdown mode ? low active supply current -95 a (typ) for tc2682 - 225 a (typ) for TC2683 - 700 a (typ) for tc2684 applications ? lcd panel bias ? cellular phones pa bias ? pagers ? pdas, portable data loggers ? battery-powered devices device selection table package type general description the tc2682/TC2683/tc2684 are cmos charge pump converters that provide an inverted doubled output from a single positive supply. an on-board oscillator provides the clock and only three external capacitors are required for full circuit implementation. switching frequencies are 12khz for the tc2682, 35khz for the TC2683, and 125khz for the tc2684. low output source impedance (typically 120 ), provides output current up to 10ma. the tc2682/ TC2683/tc2684 feature a 1.8v to 5.5v operating voltage range and high efficiency, which make them an ideal choice for a wide variety of applications requiring a negative doubled voltage derived from a single positive supply (for example: generation of -7.2v from a +3.6v lithium cell or -10v generated from a +5v logic supply). the minimum external part count and small physical size make this family of products useful for a wide variety of negative bias power supply applications. functional block diagram part number package osc. freq. (khz) operating temp. range tc2682eua 8-pin msop 12 -40c to +85c TC2683eua 8-pin msop 35 -40c to +85c tc2684eua 8-pin msop 125 -40c to +85c 1 2 3 4 8 7 6 5 t c 2 682 t c 2 683 t c 2 684 v out nc v in c2 ? gnd c1 ? c1+ c 2 + 8 -pin m sop c1+ c2+ v in c1? c2 c2? c1 tc2682 TC2683 tc2684 v out + + + ? c out input gnd c1 must have a voltage rating v in c2 and c out must have a voltage rating 2v in v out = -(2 x v in ) inverting charge pump voltage doublers obsolete device
tc2682/TC2683/tc2684 ds21548c-page 2 ? 2005 microchip technology inc. 1.0 electrical characteristics absolute maximum ratings* input voltage (v in to gnd)....................... +6.0v, -0.3v output voltage (v out to gnd)............... -12.0v, +0.3v current at v out pin.............................................20ma short-circuit duration v out to gnd ..............indefinite power dissipation (t a 70c) 8-pin msop .............................................320mw operating temperature range.............-40c to +85c storage temperature (unbiased) .......-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 spec ifications is not implied. exposure to absolute maximum rating conditions for extended periods may affect device reliability. tc2682/TC2683/tc2684 electrical specifications electrical characteristics: t a = -40c to +85c, v in = +5v, c1 = c2 = 3.3 f (tc2682), c1 = c2 = 1 f(TC2683), c1 = c2 = 0.33 f (tc2684) shdn = gnd, typical values are at t a = +25c symbol parameter min typ max units device test conditions i dd supply current ? ? ? 95 225 700 160 480 1500 a tc2682 TC2683 tc2684 v min minimum supply voltage 1.8 ? ? v all r load = 1k v max maximum supply voltage ? ? 5.5 v all r load = 1k f osc oscillator frequency 8.4 24.5 65 12 35 125 15.6 45.5 170 khz tc2682 TC2683 tc2684 v eff voltage conversion efficiency 95 99 ? % all r load = r out output resistance ? 120 170 all i load = 0.5ma to 10ma (note 1) note 1: capacitor contribution is approximately 20% of the output impedance (esr = 1/ pump frequency x capacitance).
? 2005 microchip technology inc. ds21548c-page 3 tc2682/TC2683/tc2684 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 msop) symbol description 1 c1? c1 commutation capacitor negative terminal. 2 c2+ c2 commutation capacitor positive terminal. 3 c2? c2 commutation capacitor negative terminal. 4v out doubling inverting charge pump output (-2 x v in ). 5 gnd ground. 6v in positive power supply input. 7 c1+ c1 commutation capacitor positive terminal. 8 nc no connection.
tc2682/TC2683/tc2684 ds21548c-page 4 ? 2005 microchip technology inc. 3.0 detailed description the tc2682/TC2683/tc2684 inverting charge pumps perform a -2x multiplication of the voltage applied to the v in pin. conversion is performed using two synchronous switching matrices and three external capacitors. figure 3-1 is a block diagram representation of the tc2682/TC2683/tc2684 architecture. the first switch- ing stage inverts the voltage present at v in and the second stage uses the ?-v in ? output generated from the first stage to produce the ?-2x? output function from the second stage switching matrix. each device contains an on-board oscillator that synchronously controls the operation of the charge pump switching matrices. the tc2682 synchronously switches at 12khz, the TC2683 synchronously switches at 35khz, and the tc2684 synchronously switches at 125khz. the different oscillator frequencies for this device family allow the user to trade-off capacitor size versus supply current. faster oscillators can use smaller external capacitors, but will consume more supply current (see section 1.0 electrical characteristics). figure 3-1: tc2682/TC2683/tc2684 architecture v out = -2v in -v in + c ou t v in switch matrix (1st stage) switch matrix (2nd stage) oscillator c1 + c2 +
? 2005 microchip technology inc. ds21548c-page 5 tc2682/TC2683/tc2684 4.0 applications information 4.1 output voltage considerations the tc2682/TC2683/tc2684 perform inverting voltage conversions but do not provide any type of regulation. the output voltage will droop in a linear manner with respect to the output load current. the value of the equivalent output resistance is approximately 120 nominal at +25c and v in = +5v. in this particular case, the output is approximately -10v at very light loads and will droop according to the equation below: v droop = i out x r out 4.2 capacitor selection in order to maintain the lowest output resistance and output ripple voltage, it is recommended that low esr capacitors be used. additionally, larger values of c1 and c2 will lower the output resistance and larger values of c out will reduce output ripple. note: for proper charge pump operation, c1 must have a voltage rating greater than or equal to v in , while c2 and c out must have a voltage rating greater than or equal to 2v in . table 4-1 shows various values of c1/c2 and the corresponding output resistance values for v in = 5v @ +25c. table 4-2 shows the output voltage ripple for various values of c out (again assuming v in = 5v @ +25c). the v ripple values assume a 1ma output load current and a 0.1 esr cout . table 4-1: output resistance vs. c1/c2 (esr = 0.1 ) table 4-2: output voltage ripple vs. c out 2 (esr = 0.1 ) i out = 1ma 4.3 input supply bypassing the v in input should be capacitively bypassed to reduce ac impedance and minimize noise effects due to the switching internal to the device. it is recom- mended that a large value capacitor (at least equal to c1) be connected from v in to gnd for optimal circuit performance. 4.4 inverting voltage doubler the most common application for the tc2682/TC2683/ tc2684 devices is the inverting voltage doubler (figure 4-1). this application uses three external capacitors: c1, c2 and c out . note: a power supply bypass capacitor is recommended. the output is equal to -2v in plus any voltage drops due to loading. refer to table 4-1 and table 4-2 for capacitor selection guidelines. figure 4-1: dual voltage inverter test circuit 4.5 layout considerations as with any switching power supply circuit, good layout practice is recommended. mount components as close together as possible to minimize stray inductance and capacitance. also use a large ground plane to minimize noise leakage into other circuitry. c1, c2 ( f) tc2682 r out ( ) TC2683 r out ( ) tc2684 r out ( ) 0.33 633 184 120 1 262 120 102 3.3 120 95 84 c out ( f) tc2682 v ripple (mv) TC2683 v ripple (mv) tc2684 v ripple (mv) 0.33 192 60 27 1632116 3.3 17 8 7 c1 c2 v in c in v out r l v in c out tc2682 TC2683 tc2684 c1 ? c2 ? 2 1 7 6 4 5 3 c1 + c2 + gnd + + + + device c in c1 c2 c out tc2682 3.3 f 3.3 f 3.3 f 3.3 f TC2683 1 f 1 f 1 f 1 f tc2684 0.33 f 0.33 f 0.33 f 0.33 f v out
tc2682/TC2683/tc2684 ds21548c-page 6 ? 2005 microchip technology inc. 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 8-pin msop devices package carrier width (w) pitch (p) part per full reel reel size 8-pin msop 12 mm 8 mm 2500 13 in carrier tape, number of components per reel and reel size user direction of feed pin 1 standard reel component orientation for tr suffix device p 8-pin msop .122 (3.10) .114 (2.90) .122 (3.10) .114 (2.90) .043 (1.10) max. .006 (0.15) .002 (0.05) .016 (0.40) .010 (0.25) .197 (5.00) .189 (4.80) .008 (0.20) .005 (0.13) .028 (0.70) .016 (0.40) 6 max. .026 (0.65) typ. pin 1 dimensions: inches (mm)
? 2005 microchip technology inc. ds21548c-page7 tc2682/TC2683/tc2684 sales and support data sheets products supported by a preliminary data sheet may have an e rrata sheet describing minor operational differences and recom- mended workarounds. to determine if an erra ta sheet exists for a particular device, please contact one of the following: 1. your local microchip sales office 2. the microchip corporate literature center u.s. fax: (480) 792-7277 3. the microchip worldwide site (www.microchip.com) please specify which device, revision of silicon and data sheet (include literature #) you are using. new customer notification system register on our web site (www.microchip.com/cn) to receive the most current information on our products.
tc2682/TC2683/tc2684 ds21548c-page8 ? 2005 microchip technology inc. notes:
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