View ACT3780QY-T_7893515.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

innovative power tm - 1 - www.active-semi.com copyright ? 2013 active-semi, inc. active-semi proprietary D for authorized recipients and customers activepath tm is a trademark of active-semi. act3780 rev 8, 09-jul-13 activepath tm battery charger activepath diagram features ? activepath tm system power selection of best available input supply ? 50m ? battery switch for highest efficiency ? dynamic control of charging current allowing system to draw maximum load from ac/usb input ? 0.5% battery charge voltage accuracy ? up to 12v input with over voltage protection ? thermal regulation for charge control ? charge status outputs for led or system interface ? battery voltage level indication ? programmable fast charge current ? programmable charging timer ? low reverse leakage current ? short-circuit and thermal protection ? preconditioning for deeply depleted battery ? low quiescent current standby mode ? space-saving, thermally-enhanced tqfn44-20 packages applications ? personal navigation devices ? smart mobile phones ? blue-tooth devices ? portable media players ? portable devices general description the act3780 is a complete battery-charging and system power management solution for portable hand-held equipment using single-cell lithium- based batteries. the act3780 incorporates active- semi's proprietary activepath architecture which automatically selects the be st available input supply for the system. the activepath architecture performs three important functions: first, the battery is charged while powering with the system, minimizing current draw from the battery while ensuring that sufficient current is available to power the system. second, if no input supply is available, system power is automatically switched to the battery. and finally, if the system load-requirem ent exceeds the capability of the input supply, activepath automatically supplements the input with the battery to satisfy the system's power requirements. in addition to activepath , the act3780 charger features a complete, high-accuracy (0.5%), thermally regulated, stand-alone single cell linear li+ charger with an integrated 12v power mosfet. the act3780 is available in a thermally enhanced 4mm 4mm thin-qfn44-20.
act3780 rev 8, 09-jul-13 innovative power tm - 2 - www.active-semi.com copyright ? 2013 active-semi, inc. active-semi proprietary D for authorized recipients and customers activepath tm is a trademark of active-semi. ordering information cd part number battery voltage system voltage package pins temperature range ACT3780QY-T 4.2v 4.6v tqfn44-20 20 -40c to 85c act3780qy410-t 4.1v 4.6v tqfn44-20 20 -40c to 85c pin configuration c : all active-semi components are rohs compliant and with pb-free plating unless specified differently. the term pb-free means semiconductor products that are in compliance with current rohs (restriction of haza rdous substances) standards. d : standard product options are identified in this table. contac t factory for custom options. minimum order quantity is 12,000 u nits. thin-qfn44-20 top view 1 nacok 2 3 4 5 678910 15 14 13 12 11 20 19 18 17 16 nblv1 nblv2 nstat3 nstat1 th acin g iset en act3780qy
act3780 rev 8, 09-jul-13 innovative power tm - 3 - www.active-semi.com copyright ? 2013 active-semi, inc. active-semi proprietary D for authorized recipients and customers activepath tm is a trademark of active-semi. pin descriptions pin name description 1 nacok chg_in status output. nacok is an open- drain which sinks current whenever v chg_in is within it's valid operating range. 2 nblv1 battery voltage level monitor output 1. open- drain output that sinks current when asserted. connect a 10k or greater pull-up resistors betwe en nblv1 and a suitable voltage supply. see battery voltage level indication section for more information. 3 nblv2 battery voltage level monitor output 2. open- drain output that sinks current when asserted. connect a 10k or greater pull-up resistors betwe en nblv2 and a suitable voltage supply. see battery voltage level indication section for more information. 4 nstat3 chg_in ovp status output. open-drain output that si nks current whenever v chg_in is greater than ovp threshold 6.9v (typ) while battery is pr esent. for a logic-level charge status indicator, simply connect a 10k or greater pull-up resistor between nstat3 and a suitable voltage supply. 5 nstat1 charge state indicator. open-drain output with an internal 6ma current limit, allowing this pin to directly drive an indicator led. for a logic- level charge status indicator, simply connect a 10k or greater pull-up resistor between ns tat1 and a suitable voltage supply. see the charging status indication section for mo re information. 13 g ground. 7 chg_in power input. bypass to g with a high quality ce ramic capacitor placed as close to the ic as possible. 8, 9 bat battery charger output. connect th is pin to the positive terminal of the battery. bypass to g with a high quality ceramic capacitor placed as close to the ic as possible. 10 chglev charging state select input. drive chglev to vsys or to a logic high for high-current charging mode or drive to g or a logic low for low-current charging mode. see the acin and chglev inputs section for more information. 11 en en charger enable input. drive to a logic high to enable ic, drive to a logic low to disable the device and enter suspend mode. 12 iset charge current set input. connect a resistor from iset to g to set the fast-charge current. 14 acin ac adaptor detect logic input. detects presence of a wall adaptor and automatically adjusts the charge current to the maximu m charge current level. see the acin and chglev inputs section for more information. 15 th temperature sensing input. connect to battery thermistor terminal. see the battery temperature monitoring section for mo re information. 16 dccc dynamic control of charging current set input. connect a resistor from dccc to g to set the dccc voltage. see the dynamic charge current control section for mo re information. 17 btr safety timer programming input. connect a resistor from btr to g to set the safety timers. do not leave this pin floating. see the charging safety timers section for more information. 18, 19, 20 sys system power output. bypass to g with a high quality ceramic capacitor placed as close to the ic as possible. ep exposed pad. must be soldered to ground on the pcb. 6 nstat2 charge state indicator. open-drain output with an internal 6ma current limit, allowing this pin to directly drive an indicator led. for a logic- level charge status indicator, simply connect a 10k or greater pull-up resistor between ns tat2 and a suitable voltage supply. see the charging status indication section for mo re information.
act3780 rev 8, 09-jul-13 innovative power tm - 4 - www.active-semi.com copyright ? 2013 active-semi, inc. active-semi proprietary D for authorized recipients and customers activepath tm is a trademark of active-semi. absolute maximum ratings c electrical characteristics c : do not exceed these limits to prevent damage to the device. exposure to absolute maximum rati ng conditions for long periods m ay affect device reliability. (v chg_in = 5.0v, r iset = 1k ? , r btr = 62k ? , r dccc = 18.7k ? , t a = 25c, unless otherwise specified.) parameter value unit chg_in to g -0.3 to + 14 v bat, sys, btr, iset, dccc, acin, chglev, en, th, nacok, nstat1, nstat2, nstat3, nblv1, nblv2 to g -0.3 to + 6 v input current 3.5 a output current (internal limit) bat to sys 4 a maximum junction temperature -40 to 150 c storage temperature -60 to 150 c lead temperature (soldering, 10 sec) 300 c parameter symbol test cond itions min typ max unit activepath chg_in voltage range v chg_in 4.35 12 v chg_in uvlo voltage v uvlo voltage rising 3.65 3.85 4.05 v chg_in uvlo hysteresis v hys(uvlo) 1.25 v chg_in ovp threshold v ovp voltage rising 6.60 6.90 7.20 v chg_in ovp hysteresis v hys(ovp) 360 mv chg_in supply current i sup(chg_in) v chg_in = 6v, v bat float 60 200 a v chg_in = 6v, v bat = 4.3v, activepath tm enabled and sys no load, charger in eoc or time out state or disabled. 1.8 ma chg_in to sys on-resistance r dson_q1 i sys = 100ma 0.3 0.5 ? chg_in to sys current limit i ac acin = 1 2.5 a i usb acin = g, chglev = g 80 90 100 ma acin = g, chglev = sys 400 450 500 ma sys and dccc regulation sys regulated voltage v sys_reg i sys = 100ma 4.4 4.6 4.8 v dccc pull-up current i dccc 90 100 110 a
act3780 rev 8, 09-jul-13 innovative power tm - 5 - www.active-semi.com copyright ? 2013 active-semi, inc. active-semi proprietary D for authorized recipients and customers activepath tm is a trademark of active-semi. electrical characteristics cont?d (v chg_in = 5.0v, r iset = 1k ? , r btr = 62k ? , r dccc = 18.7k ? , t a = 25c, unless otherwise specified.) parameter symbol test cond itions min typ max unit charger bat to sys on resistance r dson_q2 50 m ? sys to bat turn on threshold v chg_on sys - bat 40 75 mv sys to bat turn off threshold v chg_off sys - bat -30 charge termination voltage v term act3780qy 4.179 4.200 4.221 v act3780qy410 4.075 4.100 4.125 battery reverse leakage current i bat_rev v sys < v bat + 100mv, i sys = 0ma 2.5 5 a line regulation v sys = 4.5v to 5.5v, i bat = 10ma 0.025 %/v iset pin voltage v fstset fast charge 1 v v preset precondition charge 0.1 charge current i fstchg v bat = 3.5v r iset = 1k ? acin = g, chglev = g c 80 90 100 ma acin = g, chglev = sys 2 400 450 500 acin = sys, chglev = g -17.5% 0.5*iset 17.5% acin = sys, chglev = sys -12.5% iset e 12.5% precondition charge current i prechg v bat = 2.5v acin = g, chglev = g min ( 10 % iset , 90ma ) ma acin = g, chglev = sys 10% iset acin = sys, chglev = g 10% iset acin = sys, chglev = sys 10% iset precondition voltage threshold v prechg v bat voltage rising 2.7 2.85 3.00 v precondition threshold hysteresis v hys(prechg) v bat voltage falling 150 220 mv end-of charge current threshold i eoc v bat = 4.2v acin = g 4 % acin = sys 10 sleep-mode entry threshold v slpent 150 250 mv sleep-mode exit threshold v slpexit 50 150 mv charge restart threshold v rch v sys ? v bat , v bat falling 150 175 200 mv fast charge safety timer t normal r btr = 62k ? 3 hr precondition safety timer t pre r btr = 62k ? 1 f hr t a = 25c leakage current to bat i lkg_bat v chg_in = 5v, charger is in eoc state or time-out fault state or disabled. 0 5 a
act3780 rev 8, 09-jul-13 innovative power tm - 6 - www.active-semi.com copyright ? 2013 active-semi, inc. active-semi proprietary D for authorized recipients and customers activepath tm is a trademark of active-semi. electrical characteristics cont?d (v chg_in = 5.0v, r iset = 1k ? , r btr = 62k ? , r dccc = 18.7k ? , t a = 25c, unless otherwise specified.) parameter symbol test cond itions min typ max unit temperature sense comparator th pull-up current i th v chg_in > v bat + 200mv 92 100 108 a v th upper temperature voltage threshold v thh down-going, simulate a ntc going hotter 0.475 0.505 0.535 v v th lower temperature voltage threshold v thl up-going, simulate a ntc going colder 2.440 2.510 2.580 v v th hysteresis v hys 30 45 mv en, acin and chglev inputs en, acin, chglev pin logic high input voltage v ih 1.4 v en, acin, chglev pin logic low input voltage v il 0.4 v en pin logic leakage current i lkg1 v chg_in = 4.2v, en = sys 1 a nstat1, nstat2, nstat3, nacok, nblv1, nblv2 outputs sink current i nstatx nstat1, nstat2 4 6 8 ma v ol nstat1, nstat2, nstat3, nacok, i sink = 1ma 0.5 v v lol nblv1, nblv2, i nblvx = 2ma 0.3 v leakage current i lkg2 nstat1, nstat2, nstat3, nacok, nblv1, nblv2, v nstatx = v nacok = 5v 1 a thermal shutdown regulation thermal regulation threshold t trh 110 c thermal shutdown temperature t shtd temperature rising 160 c thermal shutdown hysteresis t hys(shtd) temperature falling 25 c output low voltage c : charge current is min of 90ma or iset 2 : charge current is min of 450ma or iset 3 : iset (ma) = 495 / (r iset (k ? ) - 0.036) f : t precondition = t normal / 3 (typ)
act3780 rev 8, 09-jul-13 innovative power tm - 7 - www.active-semi.com copyright ? 2013 active-semi, inc. active-semi proprietary D for authorized recipients and customers activepath tm is a trademark of active-semi. acin ref voltage sense 110c thermal regulation g system and charger control act3780 body control current sense body control bat sys chg_in en chglev btr nblv1 nblv2 nacok nstat2 nstat1 th iset dccc + - system supply ac adaptor usb (optional) precondition + ? + ? thermal shutdown v thl v thh ep nstat3 functional block diagram
act3780 rev 8, 09-jul-13 innovative power tm - 8 - www.active-semi.com copyright ? 2013 active-semi, inc. active-semi proprietary D for authorized recipients and customers activepath tm is a trademark of active-semi. (1) functional description the act3780 is a complete battery-charging and system power management solution for portable hand-held equipment using single-cell lithium- based batteries. the act3780 incorporates active- semi's patent-pending activepath architecture which automatically selects the best available input supply for the system, and additionally features a complete, high-accuracy (0.5%), thermally regulated, full-featured single cell linear li+ charger with an integrated 12v power mosfet. activepath architecture active-semi's proprietary activepath architecture performs three important functions: system configurat ion optimization depending upon the state of the input supply, activepath automatically optimizes the power system configuration. if the input supply is present, activepath powers the system in parallel with the battery, so that both system power and charge current can be independently managed to ensure that system po wer requirements are satisfied, the battery can charge as quickly as possible, and to ensure that the total system current does not exceed the capability of the input supply. if the input supply is not present, then activepath automatically configures the system to draw power from the battery. finally, if the system current requirement exceeds the capability of the input supply, activepath automatically configures the battery to support the load in parallel with the input supply, to ensure maximum supply capability to the load under peak-power consumption conditions. input mosfet power (q1) at the input of the act3780's activepath circuit is q1, an integrated 12v power mosfet. q1 is part of an internal low-dropout linear regulator that regulates the system voltage (v sys ) to 4.6v, protecting the system from high-voltage input supplies. q1 includes several features that can be used to limit the total current drawn from the input supply. acin's current limit is det ermined primarily by the acin input, q1 operates in ?ac-mode? when acin is driven to a logic-high, and q1 operates in ?usb- mode? when driven to a logic-low. when operating in ?ac-mode?, q1's inte rnal current limit is programmed to 2.5a. when operating in ?usb- mode?, q1's current limit is set to either 450ma, when chglev is driven to a logic-high, or to 90ma, when chglev is driven to a logic-low. this functionality provides simple means of implementing a solution that operates within the current-capability limitatio ns of the usb port while taking advantage of the high output current capability of ac adapters. for more information about the acin input, see the acin and chglev inputs section. dual-function mosfet (q2) q2 is a dual-function power mosfet, that serves both as a low-resistance (50m ? ) switch that supplies the load current requirements of the system from the battery when no input supply is present or the system demands more current than the input can provide. current-limits and charge-current programming act3780 provides a flexible current programming scheme that combines the convenience of internal charge current programming with the flexibility of resistor-based charge current programming. current limits and charge current programming are managed as a function of the acin and chglev pins, in combination with r iset , the resistance connected to the iset pin. acin and chglev inputs acin is a logic input that configures the current-limit of input transistor (q1) as well as that of the battery charger. acin features an logic input threshold, so that the input voltage detection threshold may be adjusted with a simple resistive voltage divider. this input also allows a simple, low-cost dual-input charger switch to be implemented with just a few, low-cost components. as shown in the functional block diagram. when acin is driven to a logic high, the activepath operates in ?ac-mode? and the charger charges at the current programmed by r iset , when acin is driven to a logic-low, the activepath circuitry operates in ?usb-mode?, which enforces a maximum charge current setting of 450ma, if chglev is driven to a logic-high, or 90ma, if chglev is driven to a logic-low. iset(ma) = 495 / (r iset (k ? ) - 0.036)
act3780 rev 8, 09-jul-13 innovative power tm - 9 - www.active-semi.com copyright ? 2013 active-semi, inc. active-semi proprietary D for authorized recipients and customers activepath tm is a trademark of active-semi. acin chglev fast charge current high high iset (ma) = 495 / (r iset (k ? ) - 0.036) high low 0.5 iset low high min (450ma, iset ) low low min (90ma, iset ) the act3780's charge current settings are summarized in the table below: table 1: acin and chglev inputs table note that the actual charging current may be limited to a current that is lower than the programmed fast- charge current due to the act3780?s internal thermal regulation loop. see the thermal regulation and protection section for more information. dynamic charge current control (dccc) the act3780's activepath charger features dynamic charge current control (dccc) circuitry, which continuously monitors the input supply to prevent input overload c onditions. dccc reduces the charge current when the sys voltage decreases to v dccc and stops charging when sys drops below v dccc by 1.5% (typical). the dccc voltage threshold is programmed by connecting a resistor from dccc to ga according to the following equation: where r dccc is the value of the external resistor, and i dccc (100a typical) is the value of the current sourced from dccc. given the tolerances of the r dccc and i dccc , the dccc voltage threshold should be programmed to be no less than 3.3v to prevent triggering the uvlo, and to be no larger than 4.4v to prevent engaging dccc prematurely. a 19.1k (1%), or 18.7k (1%) resistor for r dccc is recommended. battery temperature monitoring the act3780 continuously monitors the temperature of the batte ry pack by sensing the resistance of its thermistor, and suspends charging if the temperature of t he battery pack exceeds the safety limits. in a typical application, shown in figure 1, the th pin is connected to the battery pack's thermistor input. the act3780 injects a 100a current out of the th pin into the thermistor, so that the thermistor resistance is monitored by comparing the voltage at th to the internal v thh and v thl thresholds of 0.5v and 2.5v, respectively. when v th > v thl or v th < v thh charging and the charge timers are suspended. when v th returns to the normal range, charging and the charge timers resume. the net resistance from th to g required to cross the threshold is given by: 100a r nom k hot = 0.5v r nom k hot = 5k ? 100a r nom k cold = 2.5v r nom k cold = 25k ? where r nom is the nominal thermistor resistance at room temperature, and k hot and k cold are the ratios of the thermistor's resistan ce at the desired hot and cold thresholds, respectively. figure 1: simple configuration design procedure when designing with thermist ors it is important to keep in mind that their nonlinear behavior typically allows one to directly control no more than one threshold at a time. as a result, the design procedure can change depending on which threshold is most critical for a given application. most application requirements can be solved using one of three cases, 1) simple solution 2) fix v thh , accept the resulting v thl 3) fix v thl , accept the resulting v thh the act3780 was designed to achieve an operating temperature range that is suitable for most applications with very little design effort. the simple solution is often found to provide reasonable results and should always be used first, then the design procedure may proceed to one of the other solutions if necessary. () dccc dccc dccc r i 2 v = (2)
act3780 rev 8, 09-jul-13 innovative power tm - 10 - www.active-semi.com copyright ? 2013 active-semi, inc. active-semi proprietary D for authorized recipients and customers activepath tm is a trademark of active-semi. in each design example, we refer to the vishay nths series of ntcs, and more specifically those which follow a "curve 2" characteristic. for more information on these ntcs, as well as access to the resistance/temperature characteristic tables referred to in the example, please refer to the vishay website at http://www.vishay .com/thermistors. simple solution the act3780 was designed to accommodate most requirements with very little design effort, but also provides flexibility when additional control over a design is required. initial thermistor selection is accomplished by choosing one that best meets the following requirements: r nom = 5k ? /k hot , and r nom = 25k ? /k cold where k hot and k cold for a given thermistor can be found on its characteristic tables. taking a 0c to 40c application using a "curve 2" ntc for this example, from the characteristic tables one finds that k hot and k cold are 0.5758 and 2.816, respectively, and the r nom that most closely satisfies these requirements is therefore around 8.8k ? . selecting 10k ? as the nearest standard value, calculate k cold and k hot as: k cold = v thl /(i th r nom ) = 2.5v/(100a 10k ? ) = 2.5 k hot = v thh /(i th r nom ) = 0.5v/(100a 10k ? ) = 0.5 identifying these values on the curve 2 characteristic tables indi cates that the resulting operating temperature range is 2c to 44c, vs. the design goal of 0c to 40c. this example demonstrates that one can satisfy common operating temperature ranges with very little design effort. fix v thl for demonstration purposes, supposing that we had selected the next closest standard thermistor value of 6.8k ? in the example above, we would have obtained the following results: k cold = v thl /(i th r nom ) = 2.5v/(100a 6.8k ? ) = 3.67 k hot = v thh /(i th r nom ) = 0.5v/(100a 6.8k ? ) = 0.74 which, according to the characteristic tables would have resulted in an operating temperature range of -6c to 33c vs. the design goal of 0c to 40c. in this case, one can add resistance in series with the thermistor to shift t he range upwards, using the following equation: (v thh /i th ) = k hot (@40c) r nom + r r = (v thh /i th ) - k hot (@40c) r nom r = (0.5v/100a) - 0.5758 6.8k ? finally, r = 5k ? - 3.9k ? = 1.1k ? this result shows that adding 1.1k ? in series with the thermistor sets the net resistance from th to g to be 0.5v at 40c, satisfying v thh at the correct temperature. adding this resistance, however, also impacts the lower temperature limit as follows: v thl /i th = k cold (@tc) r nom + r k cold (@tc) = (v thl /i th - r)/r nom finally, k cold (@tc) = (25k ? - 1.1k ? )/6.8k ? = 3.51 reviewing the characteristic curves, the lower threshold is found to move to -5c, a change of only 1c. as a result, the system satisfies the upper threshold of 40c with an operating temperature range of -5c to 40c, vs. our design target of 0c to 40c. it is informative to highlight that due to the ntc behavior of the thermistor, the relative impact on the lower threshold is significantly smaller than the impact on the upper threshold. fix v thh following the same example as above, the "unadjusted" results yield an operating temperature range of -6c to 33c vs. the design goal of 0c to 40c. in applications that favor v thh over v thl , however, one can control t he voltage present at th at low temperatures by connecting a resistor in parallel with i th . the desired resistance can be found using the following equation: (i th + (v chg_in - v thl )/r) k cold (@0c) r nom = v thl rearranging yields r = (v chg_in - v thl )/(v thl /(k cold (@0c) r nom ) - i th ) r = (5v - 2.5v)/(2.5v/(2.816 6.8k ? ) - 100a) r = 82k ? adding 82k ? in parallel with the current source increases the net current flowing into the thermistor, thus increasing the voltage at th. adding this resistance, however, also impacts the upper temperature limit: v thh = (i th + (v chg_in - v thh )/r) k hot (@40c) r nom rearranging yields,
act3780 rev 8, 09-jul-13 innovative power tm - 11 - www.active-semi.com copyright ? 2013 active-semi, inc. active-semi proprietary D for authorized recipients and customers activepath tm is a trademark of active-semi. k hot (@tc) = v thh /(r nom (i th + (v chg_in - v thh )/r)) k hot (@tc) = 0.5v/(6.8k ? (100a + (5v - 0.5v)/82k ? )) = 0.4748 reviewing the characteristic curves, the upper threshold is found to move to 45c, a change of about 14c. adding the parallel resistance has allowed us to achieve our desired lower threshold of 0c with an operating temperature range of 0c to 45c, vs. our design target of 0c to 40c. thermal regulation and protection the act3780 features an internal thermal regulation loop that reduces the charging current as necessary to ensure that the die temperature does not rise beyond the therma l regulation threshold of 110c. this feature protects the act3780 against excessive junction temperature and makes the device more accommodating to aggressive thermal designs. note, however, that attention to good thermal designs is required to achieve the fastest possible charge time by maximizing charge current. in order to account for the extended total charge time resulting from operation in thermal regulation mode, the charge timeout periods are extended proportionally to the reduction in charge current. the conditions that cause the act3780 to reduce charge current in accordance to the internal thermal regulation loop can be approximated by calculating the power dissipated in the part. the act3780 also features thermal shutdown for further protection. when the device temperature exceeds 160c, the device will automatically turn off to prevent the ic from damage. after the die temperature decreases below 135c, the ic will automatically restart. charging safety timers the act3780 features a programmable safety charging timer by setting an external resistor from btr pin to g (r btr ). the time out period is calculated as shown in figure 2. the maximum r btr should not be larger than 68k ? . if the timeout period expires without change termination, the act3780 will jump to eoc state. if the act3780 detects that the charger remains in precondition for longer than the precondition time out period (which determined as t normal /3), the act3780 turns off the charger and generates a fault to ensure prevent charging a bad cell. figure 3: fix v thl configuration figure 4: fix v thh configuration figure 2: r btr (k ? ) 30 35 40 45 50 55 60 65 70 t normal vs. r btr t normal (min) 190 160 130 100 70
act3780 rev 8, 09-jul-13 innovative power tm - 12 - www.active-semi.com copyright ? 2013 active-semi, inc. active-semi proprietary D for authorized recipients and customers activepath tm is a trademark of active-semi. chg_in voltage nacok v uvlo < v chg_in < v ovp low v chg_in > v ovp high v chg_in < v uvlo high nstat3 x low high v bat state nblv2 nblv1 v bat < 2.8v low low 2.8v v bat < 3.6v low high 3.6v v bat < 4v high low 4v v bat high high charging status indication the act3780 provides nstat1 and nstat2 outputs to indicate the charging status of the charger. these are two open-drain outputs which sink current went asserted and high-z otherwise. these outputs have internal 6ma current limits, and are capable of directly dr iving leds, without the need of current-limiting resi stors or other external circuitry, for a visual charge-status indication. to drive an led, simply connect the led between each pin and an appropriate supply (typically v sys ). for a logic level indication, simply connect a resistor from each output to a appropriate voltage supply. for more details, see table 2 for led indication: table 2: charging status indication table battery voltage level indication when the battery is being charged, the act3780 senses vbat and features nblv1 and nblv2 as two battery voltage level indicator outputs. these are two open-drain outputs which sink current whenever asserted. for logic level indication, simply connect a resistor from each output to an appropriate voltage supply. see below table 3 for more information: table 3: battery voltage level indication table nacok output the act3780's nacok output provides a logic- level indication of the status of the voltage at chg_in. nacok is an open-drain output which sinks current when a valid input is applied to chg_in. table 4: nacok output table over voltage protection (ovp) the act3780 provides over voltage protection function. when the act3780 detects the voltage at chg_in pin is greater than 6.9v, it automatically turns off the q1 power fet and turns on the q2 to supply the system load from the battery. nstat3 output the act3780's nstat3 output provide a logic level indication of ovp. this is an open-drain output which sinks current whenever v chg_in is greater than 6.9v. enable/disable input the act3780's en is used to enable the ic. driving this pin to a logic high enables the act3780. driving en pin to a logic low forces the device to enter suspend mode. in suspend mode, if a valid input is present at chg_in pin, q1 is turned off. and the system is power ed by the battery via q2. this feature is designed to limit the power drawn from the input supply (such as usb in suspend mode). cc/cv regulation loop at the core of the act3780's battery charger is a cc/cv regulation loop, which regulates either current or voltage as necessary to ensure fast and safe charging of the battery. in a normal charge cycle, this loop regulates the current to the value set by the external resistor at the iset pin. charging continues at this current until the battery cell voltage reaches the te rmination voltage (default is 4.2v or 4.1v). at th is point the cv loop takes over, and charge current is allowed to decrease as necessary to maintain charging at the termination voltage. enable/disable charging the act3780's dccc pin can be used to disable charging. by floating the dccc pin, the charger will be disabled. state nstat1 nstat2 precondition low low fast charge low high charge complete high high disabled high high input floating high high fault high high
act3780 rev 8, 09-jul-13 innovative power tm - 13 - www.active-semi.com copyright ? 2013 active-semi, inc. active-semi proprietary D for authorized recipients and customers activepath tm is a trademark of active-semi. charger state-machine precondition state a new charging cycle begins with the precondition state, and operation continues in this state until v bat exceeds the precondition threshold voltage of 2.85v (typ). when operating in precondition state, the cell is charged at a reduced current, 10% of the programmed maximum fast-charge constant current, iset. once v bat reaches the precondition threshold voltage the state machine jumps to the fast-charge state. if v bat does not reach the precondition threshold voltage before the precondition timeout period t precondition expires, then a damaged cell is detected and the state machine jumps to the timeout- fault state. for the precondition timeout period, see the charging safety timers section for more information. fast-charge state in fast-charge state, the act3780 charges at the current programmed by r iset (see the current limits and charge current programming section for more information). during a normal charge cycle fast-charge continues in cc mode until v bat reaches the charge termination voltage (v term ), at which point the act3780 charges in top-off state. if v bat does not proceed out of the fast- charge state before the normal timeout period (t normal ) expires, then the state machine jumps to the end-of-charge stat e and will re-initiate a new charge cycle after 2-4ms ?relax?. top-off state in the top-off state, the cell is charged in constant-voltage (cv) mode. charge current decreases as charging continues. during a normal charging cycle charging proceeds until the charge current decreases below the end-of-charge (eoc) threshold, defined as 10% of iset (acin = 1) or 4% of iset (acin = 0) . when this happens, the state-machine terminates the charge cycle and jumps to the eoc state. ? if the state-machine does not jump out of the top-off state before the total- charge timeout period expires, the state machine jumps to the eoc state and will re-initiate a new charge cycle when v bat falls 175mv(typ) below the charge termination voltage. end-of-charge state in the end-of-charge (eoc) state, the act3780 presents a high-impedance to the battery, allowing the cell to ?relax? and minimizes battery leakage current. the act3780 continues to monitor the cell voltage, however, so that it can re-initiate charging cycles when v bat falls 175mv(typ) below the charge termination voltage. suspend state the act3780 features an user-selectable suspend charge mode, which disables the charger but keeps other circuiting functional. the charger can be put into suspend mode by driving en to logic low. upon exiting the suspend state, the charge timer is reset and the state machine jumps to precondition state. figure 5: typical li+ charge profile and act3780 charge states a: precondition state b: fast-charge state c: top-off state d: end-of-charge state
act3780 rev 8, 09-jul-13 innovative power tm - 14 - www.active-semi.com copyright ? 2013 active-semi, inc. active-semi proprietary D for authorized recipients and customers activepath tm is a trademark of active-semi. figure 6: charger state diagram suspend precondition fast-charge end-of-charge battery removed or (v chgin < v bat ) or (v chgin v ovp ) or en = low battery replaced and (v chgin > v bat ) and (v chgin >v chgin uvlo) and (v chgin < v ovp )and en = high v bat > 2.85v v bat = v term temp-fault top-off i bat < i eoc or t > t normal temp ok any state temp not ok timeout-fault t > t precondition t > t normal
act3780 rev 8, 09-jul-13 innovative power tm - 15 - www.active-semi.com copyright ? 2013 active-semi, inc. active-semi proprietary D for authorized recipients and customers activepath tm is a trademark of active-semi. typical performanc e characteristics (v chg_in = 5v, r dccc = 18.7k ? , t a = 25c, unless otherwise specified.) chg_in voltage (v) 3 5 7 9 11 13 act3780-001 supply current vs. chg_in voltage (en = 0) 140 120 100 80 60 40 20 0 supply current (a) act3780-002 standby current vs. chg_in voltage bat voltage (v) 0 1 2 3 4 5 6 act3780-003 bat reverse leakage vs. bat voltage act3780-004 bat reverse leakage vs. temperature act3780-005 battery voltage (usb mode) 6 5 4 3 2 1 0 standby current (ma) bat reverse leakage (a) 6 5 4 3 2 1 battery leakage current (a) charger current (ma) temperature (c) -40 -20 0 20 40 60 80 100 120 140 battery voltage (v) 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 v bat = 4.3v en = 1 no chg_in chglev = 0 chglev = 0 v bat = 4v en = 0 chg_in = 5v i sys = 0 ma 500ma usb chg_in voltage (v) 3 5 7 9 11 13 5 4 3 2 1 0 500 400 300 200 100 0 no chg_in v chg_in = 5v battery voltage (v) 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 act3780-006 charger current vs. battery voltage (usb mode) charger current (ma) chg_in = 5v i sys = 0 ma 100ma usb 100 80 60 40 20 0 v bat falling v bat rising v bat falling v bat rising over-voltage operation normal operation dropout operation under-voltage lockout
act3780 rev 8, 09-jul-13 innovative power tm - 16 - www.active-semi.com copyright ? 2013 active-semi, inc. active-semi proprietary D for authorized recipients and customers activepath tm is a trademark of active-semi. typical performanc e characteristics (v chg_in = 5v, r dccc = 18.7k ? , t a = 25c, unless otherwise specified.) temperature (c) -50 0 50 100 150 act3780-008 pre-charge current vs. temperature act3780-009 fast charge current vs. temperature act3780-010 battery regulation accuracy vs. temperature act3780-011 sys output voltage vs. chg_in voltage act3780-012 sys voltage vs. sys current (dc input) pre-charge current (ma) fast charge current (ma) 1.0 0.5 0.0 -0.5 -1.0 error (%) 4.8 4.6 4.5 4.4 4.3 4.2 4.1 4.0 4.7 sys voltage (v) 4.80 4.60 4.40 4.20 4.00 3.80 3.60 sys voltage (v) temperature (c) -40 -15 10 35 60 85 sys current (ma) 0 500 1000 1500 2000 v chg_in = 5v v bat = 2.5v v bat = 4v acin/chglev = 11 acin/chglev = 00 acin/chglev = 01 acin/chglev = 11 v chg_in = 5v v bat = 3.5v acin/chglev = 00 acin/chglev = 01 acin/chglev = 11 v chg_in = 4.5v acin/chglev = 11 v chg_in = 5v v chg_in = 5.5v chg_in voltage (v) 0 2 4 6 8 10 12 14 120 100 80 60 40 20 0 temperature (c) -50 0 50 100 150 1200 1000 800 600 400 200 0 charger current vs. battery voltage (ac mode) act3780-007 1200 1000 800 600 400 200 0 charger current (ma) chg_in = 5v i sys = 0ma r iset = 510 ? battery voltage (v) 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 v bat falling v bat rising acin = 0 chglev = 0 i sys = 10ma
act3780 rev 8, 09-jul-13 innovative power tm - 17 - www.active-semi.com copyright ? 2013 active-semi, inc. active-semi proprietary D for authorized recipients and customers activepath tm is a trademark of active-semi. typical performanc e characteristics act3780-013 sys voltage vs. sys current (usb) sys voltage (v) act3780-014 r dson q1 vs. temperature r dson q1 ( ? ) temperature (c) -40 -15 10 35 60 85 110 135 (v chg_in = 5v, r dccc = 18.7k ? , t a = 25c, unless otherwise specified.) v chg_in = 5v - 100ma v chg_in = 5v - 500ma v chg_in = 4.5v no bat 4.80 4.60 4.40 4.20 4.00 3.80 3.60 3.40 sys current (ma) 0 400 800 1200 1600 2000 2400 0.6 0.5 0.4 0.3 0.2 0.1 act3780-015 dc connect with battery present ch1 ch2 ch3 0ma ch1: v sys , 2.00v/div ch2: v chg_in , 5.00v/div ch3: i bat , 500ma/div time: 400s/div 0v r sys = 22 ? v bat = 3.6v acin/chglev = 11 charging act3780-016 ch1 ch2 ch3 dc disconnect with battery present 0v 0ma charging r sys = 22 ? v bat = 3.6v acin/chglev = 11 ch1: v sys , 2.00v/div ch2: v chg_in , 5.00v/div ch3: i bat , 500ma/div time: 400 s/div act3780-017 ch1 ch2 ch3 battery connect ch1: v sys , 2.00v/div ch2: v bat , 2.00v/div ch3: i bat , 200ma/div time: 400 s/div
act3780 rev 8, 09-jul-13 innovative power tm - 18 - www.active-semi.com copyright ? 2013 active-semi, inc. active-semi proprietary D for authorized recipients and customers activepath tm is a trademark of active-semi. typical performanc e characteristics act3780-019 ch1 ch2 ch3 charge current response vs. acin act3780-018 ch1 ch2 ch3 0ma charge current response vs. chglev (v chg_in = 5v, r dccc = 18.7k ? , t a = 25c, unless otherwise specified.) r sys = 22 ? v bat = 3.6v chglev = 1 ch1: v acin , 5.00v/div ch2: v sys , 1.00v/div ch3: i bat , 500ma/div 0v acin = 0 i sys = 0a v bat = 3.6v ch1: v chglev , 5.00v/div ch2: v sys , 1.00v/div ch3: i bat , 200ma/div
act3780 rev 8, 09-jul-13 innovative power tm - 19 - www.active-semi.com copyright ? 2013 active-semi, inc. active-semi proprietary D for authorized recipients and customers activepath tm is a trademark of active-semi. package outline tqfn44-20 package outline and dimensions r d2 e b l d d/2 e/2 a a3 a1 e2 k e symbol dimension in millimeters dimension in inches min max min max a 0.700 0.800 0.028 0.031 a1 0.000 0.050 0.000 0.002 a3 0.200 ref 0.008 ref b 0.180 0.300 0.039 0.012 d 3.900 0.154 e 3.900 0.154 d2 2.550 2.80 0.090 0.100 e2 2.550 2.80 0.090 0.100 e 0.500 bsc 0.020 bsc l 0.300 0.500 0.012 0.020 r 0.200 typ 0.008 typ 4.100 4.100 0.161 0.161 k 0.200 0.008 --- --- active-semi, inc. reserves the right to modify the circuitry or specifications without notice. user s should evaluate each product to make sure that it is suitable for their applicat ions. active-semi products are not intended or authorized for use as critical components in life-support dev ices or systems. active-semi, inc. does not assume any liability arising out of the use of any product or circuit described in this datasheet, nor does it convey any patent license. active-semi and its logo are trademarks of active-semi, inc. for more information on this and other products, contact sales@active-semi.com or visit http://www.active-semi.com . is a registered trademark of active-semi.
mouser electronics authorized distributor click to view pricing, inventory, delivery & lifecycle information: active-semi: ? ACT3780QY-T

▲Up To Search▲

Price & Availability of ACT3780QY-T

	To Download ACT3780QY-T Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .