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aat3110 da ta sheet micropower tm regulated charge pump 1 skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 202126a ? skyworks proprietary information ? products and product information are subject to change without notice. ? july 3, 2012 general description the aat3110 chargepump is a member of skyworks' total power management ic? (tpmic?) product family. it is a micropower switched capacitor voltage converter that delivers a regulated output. no external inductor is required for operation. using three small capacitors, the aat3110 can deliver up to 100ma to the voltage regu - lated output. the aat3110 features very low quiescent current and high efficiency over a large portion of its load range, making this device ideal for battery-powered applications. further more, the combination of few exter - nal components and small package size keeps the total converter board area to a minimum in space-restricted applications. the aat3110 operates in an output regu - lated voltage doubling mode. the regulator uses a pulse skipping technique to provide a regulated output from a varying input supply. the aat3110 contains a thermal management circuit to protect the device under continu - ous output short-circuit conditions. the aat3110 is available in a pb-free, surface-mount 6-pin sot23 or 8-pin sc70jw package and is rated over the -40c to +85c temperature range. features? step-up voltage converter ? input voltage range: ? aat3110-5: 2.7v to 5v ? aat3110-4.5: 2.7v to 4.5v ? micropower consumption: 13a ? regulated 5v, 4.5v 4% output ? 5v output current: ? 100ma with v in 3.0v ? 50ma with v in 2.7v ? 4.5v output current: ? 100ma with v in 3.0v ? 50ma with v in 2.7v ? peak current 250ma for 100ms ? high frequency 750khz operation ? shutdown mode draws less than 1a ? short-circuit/over-temperature protection ? 2kv esd rating ? sc70jw-8 or sot23-6 package applications? cellular phones ? digital cameras ? handheld electronics ? led/display backlight driver ? leds for camera flash ? pdas ? portable communication devices typical application v in vo ut gn d shdn c+ vin c- aat311 0 v ou t 1 f 10 f 10 f on /o ff c ou t c in downloaded from: http:///
aat3110 da ta sheet micropower tm regulated charge pump 2 skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 202126a ? skyworks proprietary information ? products and product information are subject to change without notice. ? july 3, 2012 pin descriptions pin number symbol function sot23-6 sc70jw-8 1 1 vout regulated output pin. bypass this pin to ground with a 6.8f (min) low equivalent se- ries resistance (esr) capacitor. 2 2, 3, 4 gnd ground connection. 3 5 shdn shutdown input. logic low signal disables the converter. 4 6 c- flying capacitor negative terminal. 5 7 vin input supply pin. bypass this pin to ground with a 6.8f (min) low-esr capacitor. 6 8 c+ flying capacitor positive terminal. pin configuration sot23-6 sc70jw-8 gnd c+vin c- shdn vout 12 3 4 5 6 gnd gnd gn d c+vin c- shdn vout 12 3 45 6 7 8 downloaded from: http:///
aat3110 da ta sheet micropower tm regulated charge pump 3 skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 202126a ? skyworks proprietary information ? products and product information are subject to change without notice. ? july 3, 2012 1. stresses above those listed in absolute maximum ratings may cause permanent damage to the device. functional operation at conditions other than the operating conditions specified is not implied. only one absolute maximum rating should be applied at any one time. 2. human body model is a 100pf capacitor discharged through a 1.5k w resistor into each pin. 3. mounted on an fr4 board. absolute maximum ratings 1 t a = 25c, unless otherwise noted. symbol description value units v in v in to gnd -0.3 to 6 v v out v out to gnd -0.3 to 6 v v shdn shdn to gnd -0.3 to 6 v t sc output to gnd short-circuit duration indeinite s t j operating junction temperature range -40 to 150 c t lead maximum soldering temperature (at leads, 10 sec) 300 c v esd esd rating 2 hbm 2000 v thermal information 3 symbol description rating units q ja maximum thermal resistance 150 c/w p d maximum power dissipation 667 mw downloaded from: http:///
aat3110 da ta sheet micropower tm regulated charge pump 4 skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 202126a ? skyworks proprietary information ? products and product information are subject to change without notice. ? july 3, 2012 1. v out is pulled up to 5.5v to prevent switching. 2. under short-circuit conditions, the device may enter over-temperature protection mode. 3. v out is pulled up to 5.0v to prevent switching. electrical characteristics t a = -40c to +85c, unless otherwise noted. typical values are at t a = 25c, c fly = 1f, c in = 10f, c out = 10f. symbol description conditions min typ max units aat3110-5 v in input voltage v out = 5.0v 2.7 v out v i q no load supply current 1 2.7v < v in < 5v, i out = 0ma, shdn = v in 13 30 a v out output voltage 2.7v < v in < 5v, i out 50ma 4.8 5.0 5.2 v 3.0v < v in < 5v, i out 100ma 4.8 5.0 5.2 i shdn shutdown supply current 2.7v < v in < 3.6v, i out = 0ma, v shdn = 0 0.01 1 a 3.6v < v in < 5v, i out = 0ma, v shdn = 0 2.5 v ripple ripple voltage v in = 2.7v, i out = 50ma 25 mv p-p v in = 3v, i out = 100ma 30 h eficiency v in = 2.7v, i out = 50ma 92 % f osc frequency oscillator free running 750 khz v ih shdn input threshold high 1.4 v v il shdn input threshold low 0.3 v i ih shdn input current high shdn = v in -1 1 a i il shdn input current low shdn = gnd -1 1 a t on v out turn-on time v in = 3v, i out = 0ma 0.2 ms i sc short-circuit current 2 v in = 3v, v out = gnd, shdn = 3v 300 ma aat3110-4.5 v in input voltage v out = 4.5v 2.7 v out v i q no load supply current 3 2.7v < v in < 4.5v, i out = 0ma, shdn = v in 13 30 a v out output voltage 2.7v < v in < 4.5v, i out 50ma 4.32 4.5 4.68 v 3.0v < v in < 4.5v, i out 100ma 4.32 4.5 4.68 i shdn shutdown supply current 2.7v < v in < 3.6v, i out = 0ma, v shdn = 0 0.01 1 a 3.6v < v in < 4.5v, i out = 0ma, v shdn = 0 2.5 v ripple ripple voltage v in = 2.7v, i out = 50ma 25 mv p-p v in = 3v, i out = 100ma 30 h eficiency v in = 2.7v, i out = 50ma 83 % f osc frequency oscillator free running 750 khz v ih shdn input threshold high 1.4 v v il shdn input threshold low 0.3 v i ih shdn input current high shdn = v in -1 1 a i il shdn input current low shdn = gnd -1 1 a t on v out turn-on time v in = 3v, i out = 0ma 0.2 ms i sc short-circuit current 2 v in = 3v, v out = gnd, shdn = 3v 300 ma downloaded from: http:///
aat3110 da ta sheet micropower tm regulated charge pump 5 skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 202126a ? skyworks proprietary information ? products and product information are subject to change without notice. ? july 3, 2012 typical characteristicsaat3110-5v unless otherwise noted, v in = 3v, c in = c out = 10f, c fly = 1f, t a = 25c. output voltage vs. output current 4.8 4.85 4.9 4.95 5 5.05 5.1 5.15 05 0 100 150 output current (ma) output voltage (v) v in = 2.7v v in = 3.0v v in = 3.3v v in = 3.6v supply current (a) supply current vs. supply voltage 8 10 12 14 16 18 20 22 2.5 3 3.5 4 4.5 5 5.5 supply voltage (v) i out = 0a c fl y = 1f v shdn = v in supply current vs v shdn 0 5 10 15 20 25 30 01 2345 v shdn control voltage (v) supply current (a) v in = 5.5v v in = 3.3v v in = 2.8v i out = 0 m a e ffi c i ency vs. suppl y vo lt ag e 2. 70 3.00 3.50 4.00 4.50 5.00 5045 55 60 65 70 75 80 85 90 95 supply voltage (v) efficiency (%) 50 ma 100 ma 25 ma 0.01 0. 11 10 100 1000 0 10 20 30 40 50 60 70 80 90 100 efficiency vs. load current load current (ma) efficiency (%) v in = 3.6v v in = 3.3v v in = 3.0v v in = 2.7v oscillator frequency vs. supply voltage 400 500 600 700 800 900 1000 1100 1200 2. 73 .0 3. 54 .0 4. 55 .0 supply voltage (v) oscillator frequency (khz) - 40 c 85 c 25 c downloaded from: http:///
aat3110 da ta sheet micropower tm regulated charge pump 6 skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 202126a ? skyworks proprietary information ? products and product information are subject to change without notice. ? july 3, 2012 typical characteristicsaat3110-5v unless otherwise noted, v in = 3v, c in = c out = 10f, c fly = 1f, t a = 25c. startup time with 50ma load time (50s/div) shdn (2v/div) v out (1v/div) startup time with 100ma loa d time (50s/div) shdn (2v/div ) (1v/div ) v ou t load transient response for 50ma time (50s/div) i out 0ma to 50ma (20ma/div) v out ac coupled (20mv/div) v in = 3.0v load transient response for 100ma time (50s/div) i ou t 0ma to 100 ma (50ma/div ) v out ac coupled (20mv/div ) v in = 3.0v output ripple with i out = 50ma time (2s/div) v out ac coupled (10 mv/div) v in = 3.0v output ripple with i out = 100ma time (2s/div) v out ac coupled (10mv/div) v in = 3.0v downloaded from: http:///
aat3110 da ta sheet micropower tm regulated charge pump 7 skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 202126a ? skyworks proprietary information ? products and product information are subject to change without notice. ? july 3, 2012 typical characteristicsaat3110-5v unless otherwise noted, v in = 3v, c in = c out = 10f, c fly = 1f, t a = 25c. output voltage vs. input voltage (i out = 250ma) 3.2 3.6 4 4.4 4.8 5.2 3. 23 .4 3. 63 .8 44 .2 input voltage (v) output voltage (v) one shot pulse t = 100ms -20c 55c 20c downloaded from: http:///
aat3110 da ta sheet micropower tm regulated charge pump 8 skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 202126a ? skyworks proprietary information ? products and product information are subject to change without notice. ? july 3, 2012 typical characteristicsaat3110-4.5v unless otherwise noted, v in = 3v, c in = c out = 10f, c fly = 1f, t a = 25c. output voltage vs. output current 4.49 4.5 4.51 4.52 4.53 4.54 0. 11 10 100 1000 output current (ma) output voltage (v) 2.7v 3.0v 3.3v 3.6v supply current vs. supply voltage 10 11 12 13 14 15 16 17 18 2. 53 3. 54 4.5 supply voltage (v) supply current (a) no load, switching no load, no switching supply current vs. v shdn 0 5 10 15 20 25 30 01 2345 v shdn control voltage (v) supply current (a) v in = 5.5v v in = 3.3v v in = 2.8v i out = 0 m a efficiency vs. supply voltage 50 55 60 65 70 75 80 85 2. 72 .9 3. 13 .3 3. 53 .7 3. 94 .1 4. 34 .5 supply voltage (v) efficiency (%) 100ma 50ma 5ma efficiency vs. load current 60 65 70 75 80 85 0. 11 10 100 1000 load current (ma) efficiency (%) v in = 2.7v v in = 3.0v v in = 3.3v oscillator frequency vs. supply voltage 400 500 600 700 800 900 1000 1100 1200 2. 73 .0 3. 54 .0 4. 55 .0 supply voltage (v) oscillator frequency (khz) - 40 c 85 c 25 c downloaded from: http:///
aat3110 da ta sheet micropower tm regulated charge pump 9 skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 202126a ? skyworks proprietary information ? products and product information are subject to change without notice. ? july 3, 2012 typical characteristicsaat3110-4.5v unless otherwise noted, v in = 3v, c in = c out = 10f, c fly = 1f, t a = 25c. load transient response (v in = 2.7v) time (50s/div) i out (100ma/div) v out (20mv/div) load transient response (v in = 3.0v) time (50s/div) i out (100ma/div) v out (20mv/div) output ripple (i out = 50ma @ v in = 2.7v) time (5s/div) v out ac coupled (5mv/div) output ripple (i out = 100ma @ v in = 3.0v) time (5s/div) v out ac coupled (5mv/div) output voltage vs. input voltage for pulsed high current 4 4.1 4.2 4.3 4.4 4.5 4.6 3 3.2 3.4 3.6 3.8 4 4.2 input voltage (v) output voltage (v) one-shot pulse duration = 50msi out = 250ma maximum current pulse vs. input voltage 0 100 200 300 400 500 600 33 .2 3. 43 .6 3. 84 4.2 input voltage (v) maximum current pulse (ma) one-shot pulse duration = 50ms v out > 4.0v downloaded from: http:///
aat3110 da ta sheet micropower tm regulated charge pump 10 skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 202126a ? skyworks proprietary information ? products and product information are subject to change without notice. ? july 3, 2012 typical characteristicsaat3110-4.5v unless otherwise noted, v in = 3v, c in = c out = 10f, c fly = 1f, t a = 25c. startup time (100 m s/div) v out (2v/div) shdn (1v/div) i load = 50ma @ v in = 2.7v i load = 100ma @ v in = 3.0v i load = 150ma @ v in = 3.3v downloaded from: http:///
aat3110 da ta sheet micropower tm regulated charge pump 11 skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 202126a ? skyworks proprietary information ? products and product information are subject to change without notice. ? july 3, 2012 typical characteristicsaat3110 unless otherwise noted, v in = 3v, c in = c out = 10f, c fly = 1f, t a = 25c. shdn input threshold (high) vs. input voltage 0.50 0.55 0.60 0.65 0.70 0.75 0.80 0.85 0.90 0.95 1.00 2. 02 .5 3. 03 .5 4. 04 .5 5. 05 .5 input voltage (v) shdn input threshold (high) (v) 85c 25c -40c shdn input threshold (low) vs. input voltage 0.50 0.55 0.60 0.65 0.70 0.75 0.80 0.85 0.90 0.95 1.00 2. 02 .5 3. 03 .5 4. 04 .5 5. 05 .5 input voltage (v) shdn input threshold (low) (v) -40c 85c 25c v shdn threshold vs. input voltage 0.50 0.55 0.60 0.65 0.70 0.75 0.80 0.85 0.90 0.95 1.00 2. 02 .5 3. 03 .5 4. 04 .5 5. 05 .5 input voltage (v ) v shdn th re s hold (v ) v ih v il normalized output voltage vs. temperature -0.60 -0.40 -0.20 0.00 0.20 0.40 0.60 0.80 1.00 1.20 -5 0- 25 02 55 07 5 100 125 temperature ( c) normalized output voltage (%) i out = 25ma downloaded from: http:///
aat3110 da ta sheet micropower tm regulated charge pump 12 skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 202126a ? skyworks proprietary information ? products and product information are subject to change without notice. ? july 3, 2012 functional block diagram + - v ref control shdn vin c- c+ vout gnd s1 s3 s2 s4 functional description operation (refer to block diagram) the aat3110 uses a switched capacitor charge pump to boost an input voltage to a regulated output voltage. regulation is achieved by sensing the charge pump out - put voltage through an internal resistor divider network. a switched doubling circuit is enabled when the divided output drops below a preset trip point controlled by an internal comparator. the charge pump switch cycling enables four internal switches at two non-overlapping phases. during the first phase, switches s1 and s4 are switched on (short) and switches s2 and s3 are off (open). the flying capacitor c fly is charged to a level approximately equal to input voltage v in . during the second phase, switches s1 and s4 are turned off (open) and switches s2 and s3 are turned on (short). the low side of the flying capacitor c fly is connected to gnd during the first phase. during the second phase, the flying capacitor c fly is switched so that the low side is connected to v in . the voltage at the high side of the flying capacitor c fly is bootstrapped to 2 v in and is connected to output through a switch. for each cycle phase, charge from input node v in is trans - ported from a lower voltage to a higher voltage. this cycle repeats itself until the output node voltage is high enough to exceed the preset input threshold of the con - trol comparator. when the output voltage exceeds the downloaded from: http:///
aat3110 da ta sheet micropower tm regulated charge pump 13 skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 202126a ? skyworks proprietary information ? products and product information are subject to change without notice. ? july 3, 2012 internal trip point level, the switching cycle stops and the charge pump circuit is temporarily placed in an idle state. when idle, the aat3110 has a quiescent current of 13a or less. the closed loop feedback system con - taining the voltage sense circuit and control comparator allows the aat3110 to provide a regulated output volt - age to the limits of the input voltage and output load current. the switching signal, which drives the charge pump, is created by an integrated oscillator within the control circuit block. the free-running charge pump switching frequency is approximately 750khz. the switching frequency under an active load is a function of v in , v out , c out, and i out . for each phase of the switching cycle, the charge trans - ported from v in to v out can be approximated by the fol - lowing formula: v phase ? c fly (2 v in - v out ) the relative average current that the charge pump can supply to the output may be approximated by the follow - ing expression: i out(avg) c fly (2 v in - v out ) f sw the aat3110 has complete output short-circuit and thermal protection to safeguard the device under extreme operating conditions. an internal thermal pro - tection circuit senses die temperature and will shut down the device if the internal junction temperature exceeds approximately 145c. the charge pump will remain dis - abled until the fault condition is relieved. applications information external capacitor selection careful selection of the three external capacitors c in , c out , and c fly is very important because they will affect turn-on time, output ripple, and transient performance. optimum performance will be obtained when low esr ceramic capacitors are used. in general, low esr may be defined as less than 100m w . if desired for a particular application, low esr tantalum capacitors may be substi - tuted; however, optimum output ripple performance may not be realized. aluminum electrolytic capacitors are not recommended for use with the aat3110 due to their inherent high esr characteristic. typically as a starting point, a capacitor value of 10f should be used for c in and c out with 1 m f for c fly when the aat3110 is used under maximum output load conditions. lower values for c in , c out , and c fly may be utilized for light load current applications. applications drawing a load current of 10ma or less may use a c in and c out capacitor value as low as 1f and a c fly value of 0.1f. c in and c out may range from 1f for light loads to 10f or more for heavy output load conditions. c fly may range from 0.01f to 2.2f or more. if c fly is increased, c out should also be increased by the same ratio to minimize output ripple. as a basic rule, the ratio between c in , c out , and c fly should be approximately 10 to 1. the compro - mise for lowering the value of c in , c out , and the flying capacitor c fly is that the output ripple voltage may be increased. in any case, if the external capacitor values deviate greatly from the recommendation of c in = c out = 10f and c fly = 1f, the aat3110 output performance should be evaluated to assure the device meets applica - tion requirements. in applications where the input voltage source has very low impedance, it is possible to omit the c in capacitor. however, if c in is not used, circuit performance should be evaluated to assure desired operation is achieved. under high peak current operating conditions that are typically experienced during circuit start-up or when load demands create a large inrush current, poor output voltage regu - lation can result if the input supply source impedance is high or if the value of c in is too low. this situation can be remedied by increasing the value of c in . downloaded from: http:///
aat3110 da ta sheet micropower tm regulated charge pump 14 skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 202126a ? skyworks proprietary information ? products and product information are subject to change without notice. ? july 3, 2012 capacitor characteristics ceramic composition capacitors are highly recommend - ed over all other types of capacitors for use with the aat3110. ceramic capacitors offer many advantages over their tantalum and aluminum electrolytic counter - parts. a ceramic capacitor typically has very low esr, is lower cost, has a smaller pcb footprint, and is non- polarized. low esr ceramic capacitors help maximize charge pump transient response. since ceramic capaci - tors are non-polarized, they are not prone to incorrect connection damage. equivalent series resistance: esr is a very important characteristic to consider when selecting a capacitor. esr is a resistance internal to a capacitor that is caused by the leads, internal connections, size or area, material composition, and ambient temperature. typically, capac - itor esr is measured in milliohms for ceramic capacitors and can range to more then several ohms for tantalum or aluminum electrolytic capacitors. ceramic capacitor materials: ceramic capacitors less than 0.1f are typically made from npo or c0g materi - als. npo and c0g materials typically have tight tolerance and are very stable over temperature. large capacitor values are typically composed of x7r, x5r, z5u, or y5v dielectric materials. large ceramic capacitors, typically greater than 2.2f, are often available in low-cost y5v and z5u dielectrics. if these types of capacitors are selected for use with the charge pump, the nominal value should be doubled to compensate for the capacitor toler - ance which can vary more than 50% over the operating temperature range of the device. a 10f y5v capacitor could be reduced to less than 5f over temperature; this could cause problems for circuit operation. x7r and x5r dielectrics are much more desirable. the temperature tolerance of x7r dielectric is better than 15%. capacitor area is another contributor to esr. capacitors that are physically large will have a lower esr when compared to an equivalent material smaller capacitor. these larger devices can improve circuit transient response when compared to an equal value capacitor in a smaller package size. charge pump efficiency the aat3110 is a regulated output voltage doubling charge pump. the efficiency ( h ) can simply be defined as a linear voltage regulator with an effective output voltage that is equal to two times the input voltage. efficiency ( h ) for an ideal voltage doubler can typically be expressed as the output power divided by the input power. = p out p in in addition, with an ideal voltage doubling charge pump, the output current may be expressed as half the input current. the expression to define the ideal efficiency ( h ) can be rewritten as: = p out = v out ? i out = v out p in v in ? 2 ? i out 2 ? v in -or- (%) = 100 v out 2v in ???? for a charge pump with an output of 5.0v and a nominal input of 3.0v, the theoretical efficiency is 83.3%. due to internal switching losses and ic quiescent current con - sumption, the actual efficiency can be measured at 82.7%. these figures are in close agreement for output load conditions from 1ma to 100ma. efficiency will decrease as load current drops below 0.05ma or when the level of v in approaches v out . refer to the typical char- acteristics section of this datasheet for measured plots of efficiency versus input voltage and output load current for the given charge pump output voltage options. short-circuit and thermal protection in the event of a short-circuit condition, the charge pump can draw a much as 100ma to 400ma of current from v in . this excessive current consumption due to an output short-circuit condition will cause a rise in the internal ic junction temperature. the aat3110 has a thermal protec - downloaded from: http:///
aat3110 da ta sheet micropower tm regulated charge pump 15 skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 202126a ? skyworks proprietary information ? products and product information are subject to change without notice. ? july 3, 2012 tion and shutdown circuit that continuously monitors the ic junction temperature. if the thermal protection circuit senses the die temperature exceeding approximately 145c, the thermal shutdown will disable the charge pump switching cycle operation. the thermal limit system has 10c of system hysteresis before the charge pump can reset. once the over-current event is removed from the output and the junction temperature drops below 135c, the charge pump will become active again. the thermal protection system will cycle on and off if an out - put short-circuit condition persists. this will allow the aat3110 to operate indefinitely under short-circuit condi - tions without damaging the device. output ripple and ripple reduction there are several factors that determine the amplitude and frequency of the charge pump output ripple, the val - ues of c out and c fly , the load current i out , and the level of v in . ripple observed at v out is typically a sawtooth wave - form in shape. the ripple frequency will vary depending on the load current i out and the level of v in . as v in increases, the ability of the charge pump to transfer charge from the input to the output becomes greater. as it does, the peak-to-peak output ripple voltage will also increase. the size and type of capacitors used for c in , c out , and c fly have an effect on output ripple. since output ripple is associated with the r/c charge time constant of these two capacitors, the capacitor value and esr will contrib - ute to the resulting charge pump output ripple. this is why low esr capacitors are recommended for use in charge pump applications. typically, output ripple is not greater than 30mv p-p when v in = 3.0v, v out = 5.0v, c out = 10f, and c fly = 1f. when the aat3110 is used in light output load applica - tions where i out < 10ma, the flying capacitor c fly value can be reduced. the reason for this effect is when the charge pump is under very light load conditions, the transfer of charge across c fly is greater during each phase of the switching cycle. the result is higher ripple seen at the charge pump output. this effect will be reduced by decreasing the value of c fly . caution should be observed when decreasing the flying capacitor. if the output load current rises above the nominal level for the reduced c fly value, charge pump efficiency can be compromised. there are several methods that can be employed to reduce output ripple depending upon the requirements of a given application. the most simple and straightfor - ward technique is to increase the value of the c out capacitor. the nominal 10f c out capacitor can be increased to 22f or more. larger values for the c out capacitor (22f and greater) will by nature have lower esr and can improve both high and low frequency com - ponents of the charge pump output ripple response. if a higher value tantalum capacitor is used for c out to reduce low frequency ripple elements, a small 1f low esr ceramic capacitor should be added in parallel to the tantalum capacitor (see figure 1). the reason for this is tantalum capacitors typically have higher esr than equivalent value ceramic capacitors and are less able to reduce high frequency components of the output ripple. the only disadvantage to using large values for the c out capacitor is the aat3110 device turn-on time and inrush current may be increased. if additional ripple reduction is desired, an r/c filter can be added to the charge pump output in addition to the c out capacitor (see figure 2). an r/c filter will reduce output ripple by primarily attenuating high frequency components of the output ripple waveform. the low fre - quency break point for the r/c filter will significantly depend on the capacitor value selected. layout considerations high charge pump switching frequencies and large peak transient currents mandate careful printed circuit board layout. as a general rule for charge pump boost convert - ers, all external capacitors should be located as closely as possible to the device package with minimum length trace connections. maximize the ground plane around the aat3110 charge pump and make sure all external capacitors are connected to the immediate ground plane. a local component side ground plane is recom - mended. if this is not possible due to layout design limitations, assure good ground connections by the use of large or multiple pcb vias. refer to the aat3110 evaluation board for an example of good charge pump layout design (figures 3 through 5). downloaded from: http:///
aat3110 da ta sheet micropower tm regulated charge pump 16 skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 202126a ? skyworks proprietary information ? products and product information are subject to change without notice. ? july 3, 2012 c fly 1 f c in 10 f c out1 22 f v out (5v) v in (2.7v to 5v) c+ vout gndshdn vin c- on/off aat3110-5 c out2 1 f + + figure 1: application using tantalum capacitor. 1 f 10 f c out c fly c in 10 f v out v in (5v) (2.7v to 5v) c+ vout gndshdn vin c- on/off aat3110-5 c filte 33 f filte 1.5 figure 2: application with output ripple reduction filter. figure 3: evaluation board figure 4: evaluation board top side silk screen layout/ component side layout. assembly drawing. downloaded from: http:///
aat3110 da ta sheet micropower tm regulated charge pump 17 skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 202126a ? skyworks proprietary information ? products and product information are subject to change without notice. ? july 3, 2012 figure 5: evaluation board solder side layout. typical application circuits 1 f c in 10 f c out c fly 10 f v out (5v) v in (2.7v to 5v) c+ vout gndshdn vin c- on/off aat3110-5 figure 6: typical charge pump boost converter circuit. c fly 1 f c in 10 f c out 10 f aat3110-5 gnd shdn vout vin c+ c- v in (usb port v out ) gnd (usb port retr) v out 5v 100a gnd figure 7: 5v, 100ma supply powered from a usb port. downloaded from: http:///
aat3110 da ta sheet micropower tm regulated charge pump 18 skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 202126a ? skyworks proprietary information ? products and product information are subject to change without notice. ? july 3, 2012 10 f on/off shdn c+ vout vin c- aat3110-5 1 f 10 f 120 120 120 120 li-ion battery 2v to 2v figure 8: 5v led or display driver from a li-ion battery source. vin gnd shdn vout vin vout c+ c- gnd shdn c+ c- c fly 1 f c fly 1 f c out 10 f c in 10 f aat3110-5aat3110-5 (a)(b) v in = 3.0v to 5v shdn v out = 5v i out = 200ma figure 9: 5v, 200ma step-up supply from a 3v to 5v source. downloaded from: http:///
aat3110 da ta sheet micropower tm regulated charge pump 19 skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 202126a ? skyworks proprietary information ? products and product information are subject to change without notice. ? july 3, 2012 1. xyy = assembly and date code. 2. sample stock is generally held on all part numbers listed in bold . ordering information output voltage package marking 1 part number (tape and reel) 2 4.5v sot23-6 eexyy aat3110igu-4.5-t1 5.0v sot23-6 asxyy aat3110igu-5.0-t1 4.5v sc70jw-8 eexyy aat3110ijs-4.5-t1 5.0v sc70jw-8 asxyy aat3110ijs-5.0-t1 skyworks green? products are compliant with all applicable legislation and are halogen-free. for additional information, refer to skyworks de?nition of green? , document number sq04-0074. package information sot23-6 1.90 bsc 0.95 bsc 0.45 0.15 0.10 bsc 2.85 0.15 0.075 0.075 0.40 0.10 6 1.575 0.125 1.20 0.25 1.10 0.20 2.80 0.20 4 4 10 5 0.15 0.07 gauge plane 0.60 ref all dimensions in millimeters. downloaded from: http:///
aat3110 da ta sheet micropower tm regulated charge pump 20 skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 202126a ? skyworks proprietary information ? products and product information are subject to change without notice. ? july 3, 2012 copyright ? 2012 skyworks solutions, inc. all rights reserved. information in this document is provided in connection with skyworks solutions, inc. (skyworks) pr oducts or services. these materials, including the information contained herein, are provided by sky works as a service to its customers and may be used for informational purposes only by the customer. skyworks a ssumes no responsibility for errors or omissions in these materials or the information contained her ein. sky- works may change its documentation, products, services, speciications or product descriptions at any time, without notice. skyworks makes no commitment to update the materials or information and shall have no responsibility whatsoever for conlicts, incompatibilities, or other dificulties arising from any fut ure changes. no license, whether express, implied, by estoppel or otherwise, is granted to any intellectual prope rty rights by this document. skyworks assumes no liability for any materials, products or informatio n provided here- under, including the sale, distribution, reproduction or use of skyworks products, information or ma terials, except as may be provided in skyworks terms and conditions of sale. the materials, products and information are provided as is without warranty of any kind, whether e xpress, implied, statutory, or otherwise, including fitness for a particular purpose or use, merchantability, performance, quality or non-infringement of any intellectual proper ty right; all such warranties are hereby expressly disclaimed. skyworks does not warrant the accuracy or completeness of the information, text, graphics or other items contained within these materials. skyworks shall not be liable for any damages, in- cluding but not limited to any special, indirect, incidental, statutory, or consequential damages, i ncluding without limitation, lost revenues or lost profits that may result from the use of the materials or information, whether or not the recipient of materials has been advised of the possibility of such damage. skyworks products are not intended for use in medical, lifesaving or life-sustaining applications, o r other equipment in which the failure of the skyworks products could lead to personal injury, death , physical or en- vironmental damage. skyworks customers using or selling skyworks products for use in such applicatio ns do so at their own risk and agree to fully indemnify skyworks for any damages resulting from such improper use or sale. customers are responsible for their products and applications using skyworks products, which may dev iate from published speciications as a result of design defects, errors, or operation of products ou tside of pub- lished parameters or design speciications. customers should include design and operating safeguards to minimize these and other risks. skyworks assumes no liability for applications assistance, custom er product design, or damage to any equipment resulting from the use of skyworks products outside of stated pub lished speciications or parameters. skyworks, the skyworks symbol, and breakthrough simplicity are trademarks or registered trademarks of skyworks solutions, inc., in the united states and other countries. third-party brands and names are for identiication purposes only, and are the property of their respective owners. additional information , including relevant terms and conditions, posted at www.skyworksinc.com, are incorporated by refere nce. sc70jw-8 0.225 0.075 0.45 0.10 0.05 0.05 2.10 0.30 2.00 0.20 7 3 4 4 1.75 0.10 0.85 0.15 0.15 0.05 1.10 max 0.100 2.20 0.20 0.048ref 0.50 bsc 0.50 bsc 0.50 bsc all dimensions in millimeters. downloaded from: http:///

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