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eup8060x ds8060x v e r 1.0 may 2008 1 1a li-ion/polymer charger ic with thermal regulation and ovp description the eu p806 0x series are hi ghly integrated single cell li-ion/polymer battery charger ic designed for handheld devices. the eup8060x integrates internal power fet, current sensor, charge status, reverse current protection and overvoltage protection (ovp) in a single monolithic devices. when ac-adapter is applied, an external resistor sets the magnitude of the charge current, which may be programmed up to 1a. thermal feedback also regulates the charge current to limit the die temperature when fast charging or while exposed to high ambient temperature. the eup8060x charges the battery in three phases: conditioning, constant current, and constant voltage. charge is terminated based on minimum current. an internal charge timer provides a backup safety for charge termination. the eup8060x can operate in an ldo mode which is used primary during system level testing of the handset to eliminate the need for battery insertion. the eup8060x automatically re-starts the charge if the battery voltage falls below an internal threshold. the eup8060x also automatically enters sleep mode when dc supplies are removed. no external sense resistor or blocking diode is required for charging. typical application cir cuit features z program mable charge current up to 1a z 1% vo l tage regulation accuracy z thermal regulation to maximize charge rate z input overvoltage protection: 6.6v and 11v options z charge termination by minimum current and time z precharge conditioning with safety timer z status outputs to indicate charge, fault, and power good outputs z reverse leakage protection prevents battery drainage z short-circuit and thermal protection z automatic sleep mode for low power consumption z ldo mode operation for system level testing without battery insertion z 3mm 3mm tdfn package z rohs compliant and 100% lead (pb)-free applicat ions z mobile pho ne, pda, mp3 players, digital cameras z mobile internet devices (m1d) figure 1. eup8060b v?mw`r?y?b? www.gofotech.com
eup8060x ds8060x ver 1.0 may 2008 2 block diagram figure 2. block diagram n~n?t?m?w3^v?mw`r?y?b?g ?pqls? tel: 0755-8398 3377 / 135 9011 2223 http://www.gofotech.com v?mw`r?y?b? www.gofotech.com
eup8060x ds8060x ver 1.0 may 2008 3 pin configurations package type pin configurations package type pin configurations eup8060a/d tdfn-10 eup8060b tdfn-10 eup8060c tdfn-10 pin description pin a,d b c i/o description in 1 1 1 i charge input voltage and internal supply. connect a 1- f (minimum) capacitor from in to vss. c in c out tmr 2 2 2 i safety timer program input, timer disabled if floating. connect a resistor to vss pin to program safety timer timeout value stat1 3 3 3 o charge status output 1 (open-collector, see table 3) stat2 4 4 4 o charge status output 2 (open-collector, see table 3) vss 5 5 5 i ground iset 6 6 6 o charge current set point, resistor connected from iset to vss sets charge current value. connect a 0.47-f capacitor from bat to iset. pg 7 7 o power good status output (open-collector), active low ce 8 7 i charge enable input. ce = lo enables charger. ce = hi disables charger. te 8 i termination enable input. te = lo enables termination detection and battery absent detection. te = hi disables termination detection and battery absent detection. ts 8 i temperature sense input, connect to battery pack thermistor. connect an external resistive divider to program temperature thresholds. bat 9 9 9 i battery voltage sense input. connect to the battery positive terminal. connect a 200 ? resistor from bat to out. out 10 10 10 o charge current output. connect to the battery positive terminal. connect a 1-f (minimum) capacitor from out to vss. n~n?t?m?w3^v?mw`r?y?b?g ?pqls? tel: 0755-8398 3377 / 135 9011 2223 http://www.gofotech.com v?mw`r?y?b? www.gofotech.com
eup8060x ds8060x ver 1.0 may 2008 4 ordering information order number package type marking operating temperature range eup8060ajir1 tdfn-10 xxxxx 8060a -40 c to 85c EUP8060BJIR1 tdfn-10 xxxxx 8060b -40 c to 85c eup8060cjir1 tdfn-10 xxxxx 8060c -40 c to 85c eup8060djir1 tdfn-10 xxxxx 8060d -40 c to 85c eup8060x ?? ?? ?? ?? lead free code 1: lead free 0: lead packing r: tape & reel operating temperature range i: industry standard package type j: tdfn n~n?t?m?w3^v?mw`r?y?b?g ?pqls? tel: 0755-8398 3377 / 135 9011 2223 http://www.gofotech.com v?mw`r?y?b? www.gofotech.com
eup8060x ds8060x ver 1.0 may 2008 5 absolute maximum ratings ? supply voltage (in with resp ect to vss )----------------------------------------------------------- -0.3v to18v ? input voltage on in, statx, pg , ts, ce , te (all with respect to vss) --------------------- -0.3v to vin ? input voltage on out,bat,iset,tmr (all with respect to vss) ------------------------------ -0.3v to 7v ? output sink current (statx)+pg ------------------------------------------------------------------ 15ma ? output current (out pin) ------------------------------- --------------------------------------------- 1.5a ? junction temperature range, t j ------------------------------------------------------------------------- 150c ? storage temperature range, tstg ------------------------------------------------------------- -65c to 150c ? lead temperature (soldering, 10s) -------------------------------------------------------------------- 260c dissipation ratings package c ja t a < 40c power rating derating factor above t a = 25c tdfn-10 48c/w 1.5w 0.0208 w/c recommended operating conditions min. max. unit supply voltage, v in 4.35 16.5 v operating junction temperature range, t j -40 125 c electrical characteristics over recommended operating, t j = 0~125c range, see the application circuits section, typical values at t j = 25c (unless otherwise noted). eup8060x symbole parameter test conditions min typ max unit power down threshold ? undervoltage lockout v (uvlo) power down threshold increase v(in): 0 ? 4 v 1.5 3.5 v input power detection, ce = hi or low, v(in) > 3.5 v v in(dt) input power detection threshold v (in) detected at [v(in) ? v(out)] > v in(dt) 180 mv v hys(indt) input power detection hysteresis input power not detected at [v (in) ? v (out) ] < [v in(dt) ? v hys(indt) ] 30 mv t dgl(indt1) deglitch time, input power detected status pg :hi ? lo, thermal regulation loop not active, r tmr = 50 k or v (tmr) = open 1.5 3.5 ms t dgl(noin) delay time, input power not detected status pg : lo ? hi after t dgl(noin) 10 s t dly(chgoff) charger off delay charger turned off after t dly(chgoff) , measured from pg : lo ? hi; timer reset after t dly(chgoff) 28 32 ms input overvoltage protection eup8060a/b/c 6.2 6.6 7.0 v (ovp) input overvoltage detection threshold v(in) increasing eup8060d 10.2 11 11.7 v eup8060a/b/c 30 mv v hys(ovp) input overvoltage hysteresis v(in) decreasing eup8060d 30 mv t dgl(ovdet) input overvoltage detection delay ce = hi or lo, measured from v(in) > v (ovp) to pg : lo ? hi; vin increasing 10 100 s t dgl(ovndet) input overvoltage not detected delay ce = hi or lo, measured from v(in) < v (ovp) to pg : hi ? lo; vin decreasing 10 100 s n~n?t?m?w3^v?mw`r?y?b?g ?pqls? tel: 0755-8398 3377 / 135 9011 2223 http://www.gofotech.com v?mw`r?y?b? www.gofotech.com
eup8060x ds8060x ver 1.0 may 2008 6 electrical characteristics over recommended operating, t j = 0~125c range, see the application circuits section, typical values at t j = 25c (unless otherwise noted). eup8060x symbole parameter test conditions min typ max unit quiescent current v (in) = 6 v 50 200 i cc(chgoff) in pin quiescent current, charger off input power detected, ce = hi v (in) = 16.5 v 250 a i cc(chgon) in pin quiescent current, charger on input power detected, ce = lo, v bat = 4.5 v 0.7 1.5 ma i bat(done) battery leakage current after termination into ic input power detected, charge terminated, ce = lo 1 5 a i bat(chgoff) battery leakage current into ic, charger off input power detected, ce = hi or input power not detected, ce = lo 1 5 a ts pin comparator v (ts1) lower voltage temperature threshold hot detected at v(ts) < v (ts1) ; ntc thermistor 29 30 31 %v(in) v (ts2) upper voltage temperature threshold cold detected at v(ts) > v( ts2) ; ntc thermistor 57 58 59 %v(in) v hys(ts) hysteresis temp ok at v(ts) > [ v (ts1) + v hys(ts) ] or v (ts) < [ v (ts2) ? v hys(ts) ] 2 %v(in) ce input v il input (low) voltage v( ce ) increasing 0 1 v ih input (high) voltage v( ce ) decreasing 2.0 v stat1, stat2 and pg outputs , v(in) ?y vo(reg) + v(do-max) v ol output (low) saturation voltage ioutput = 5 ma (sink) 1.2 v thermal shutdown t (shut) temperature trip junction temperature, temp rising 155 c t (shuthys) thermal hysteresis junction temperature 20 c voltage regulation, v(in) ?y vo(reg) + v(do-max), i(term) < i(out) < io(out), charger enabled, no fault conditions detected v o(reg) output voltage eup8060a/b/c/d 4.20 v v o(tol) voltage regulation accuracy ?1% 1% v (do) dropout voltage, v(in) ? v(out) i (out) = 1 a 800 mv current regulation , v(in) > v(out) > v(do-max), charger enabled, no fault conditions detected i o(out) output current range v (bat) > v (lowv) , i o(out) = i (out) = k (set) v (set) /r set 100 1000 ma v (set) output current set voltage v(iset) = v (set) , v (lowv) < v(bat) ? v o(reg) 2.45 2.50 2.55 v k (set) output current set factor 100 ma ? i o(out) ? 1000 ma ma k ? volts 325 445 r iset external resistor range resistor connected to iset pin 0.7 10 k ? voltage and current regulation timing, v(in) > v(out) + v(do-max), charger enabled, no fault conditionsdetected, rtmr = 50k or v(tmr) = open; thermal regulation loop not active t pwrup(chg) input power detection to full charge current time delay measured from pg :hi ? lo to i(out) > 100 ma, ce = lo, i o(out) = 1 a, v(bat) = 3.5 v 25 35 ms t pwrup(en) charge enable to full charge current delay measured from ce :hi ? lo to i(out) >100 ma, i o(out) = 1a, v (bat) = 3.5 v, v (in) = 4.5 v, input power detected 25 35 ms t pwrup(ldo) input power detection to voltage regulation delay, ldo mode set, no battery or load connected measured from pg :hi ? lo to v(out) > 90% of charge voltage regulation; v (tmr) = open, ldo mode set, no battery and no load at out pin, ce = lo 25 35 ms precharge and output short-circuit current regulation, v(in)?v(out) > v(do-max) , v(in) 4.5v, charger enabled, no fault conditio ns detected, rtmr = 50k or v(tmr)=open; thermal regulation loop not active v (lowv) precharge to fast-charge transition threshold v (bat) increasing 2.8 2.95 3.15 v v (sc) precharge to short-circuit transition threshold v (bat) decreasing 1.2 1.4 1.6 v n~n?t?m?w3^v?mw`r?y?b?g ?pqls? tel: 0755-8398 3377 / 135 9011 2223 http://www.gofotech.com v?mw`r?y?b? www.gofotech.com
eup8060x ds8060x ver 1.0 may 2008 7 electrical characteristics over recommended operating, t j = 0~125c range, see the application circuits section, typical values at t j = 25c (unless otherwise noted). eup8060x symbole parameter test conditions min typ max unit precharge and output short-circuit current regulation, v(in)?v(out) > v(do-max) , v(in) 4.5v, charger enabled, no fault conditio ns detected, rtmr = 50k or v(tmr)=open; thermal regulation loop not active v (scind) short-circuit indication v (bat) decreasing 1.6 1.8 2.0 v i o(prechg) precharge current range v(sc) < vi(bat) < v(lowv), t < t(prechg) io(prechg) = k(set) v(prechg)/r(iset) 10 100 ma v (prechg) precharge set voltage v (iset) = v (prechg) , v (sc) < v i(bat) < v (lowv) , t < t (prechg) 225 250 280 mv v por < v in < 6.0v 15 22 30 i o(short) output shorted regulation current v ss ? v (bat) ? v (sci) , i o(short) = i (out) , v (bat) =vss 6.0 v < v in v (rch) , i (term) = k (set) v (term) /r iset 10 100 ma v (term) charge termination detection set voltage (1) v (bat) > v (rch) 225 250 275 mv t dgl(term) deglitch time, termination detected v (iset) decreasing 15 25 35 ms battery recharge threshold v (rch) recharge threshold detection [v o(reg) ?v(bat) ] > v (rch) 75 100 135 mv t dgl(rch) deglitch time, recharge detection v (bat) decreasing 15 25 35 ms timers, ce = lo, charger enabled, no fault condition s detected, v(tmr) < 3 v, timers enabled t (chg) charge safety timer range t (chg) = k (chg) r tmr ; thermal loop not active 3 10 hours k (chg) charge safety timer constant v (bat) > v (lowv) 0.08 0.1 0.12 hr/k t (pchg) pre-charge safety timer range t (pchg) = k (pchg) t (chg) ; thermal regulation loop not active 1080 3600 sec k (pchg) pre-charge safety timer constant v (bat) < v (lowv) 0.08 0.1 0.12 v tmr(off) charge timer and termination enable threshold [charge timer and termination disabled] at v (tmr) > v tmr(off) eup8060a/b/d charge timer enable threshold [charge timer disabled] at v (tmr) > v tmr(off) eup8060c 2.5 3.0 3.5 v i tmr tmr pin source current v (tmr) = 3.5 v, v (in) = 4.5 v 1 6 a battery detection thresholds i det(down) battery detection current (sink) 2 v < v (bat) < v o(reg) 1 2 3.2 ma i det(up) battery detection current (source) 2 v < v (bat) < v o(reg) io(prechg) t (detect) battery detection time 2 v < v (bat) < v o(reg) , thermal regulation loop not active; r tmr = 50 k , i det(down) or i det (up) 85 120 150 ms timer fault recovery i (fault) fault current (source) v (out) < v (rch) -10 ma charge overcurrent detection, v(in) ?y 4.5 v, charger enabled i ch(oi) charge overcurrent detection threshold v (iset) = vss 1.8 a t dgl(oi) overcurrent detection delay time measured from v (iset) = vss to i o(out) = 0 100 s (1) the voltage on the iset pin is compared to the v(term ) voltage to determine when the termination should occur. n~n?t?m?w3^v?mw`r?y?b?g ?pqls? tel: 0755-8398 3377 / 135 9011 2223 http://www.gofotech.com v?mw`r?y?b? www.gofotech.com
eup8060x ds8060x ver 1.0 may 2008 8 2.0 2.2 2.4 2.6 2.8 3.0 98 99 100 101 102 103 104 105 106 107 pre-charge current vs battery voltage 85 o c 25 o c 0 o c charge current - ma battery voltage -v typical operating characteristics figure3. figure5. figure7. figure4. figure6. figure8. n~n?t?m?w3^v?mw`r?y?b?g ?pqls? tel: 0755-8398 3377 / 135 9011 2223 http://www.gofotech.com v?mw`r?y?b? www.gofotech.com
eup8060x ds8060x ver 1.0 may 2008 9 3.0 3.2 3.4 3.6 3.8 4.0 950 960 970 980 990 1000 1010 1020 85 o c 25 o c 0 o c fast-charge current vs battery voltage charge current - ma battery voltage -v figure9. figure11. figure13. figure10. figure12. figure14. 3 . 03 . 23 . 43 . 63 . 84 . 0 50.50 50.75 51.00 51.25 51.50 fast-charge current vs battery voltage 85 o c 25 o c 0 o c charge current - ma battery voltage -v 0 100 200 300 400 500 600 700 800 900 1000 1100 340 360 380 400 420 440 85 o c 25 o c 0 o c kset linearity vs charge current kset - a/a battery charge current - ma 4567891011 4.240 4.245 4.250 4.255 battery regulation voltage vs input voltage 85 o c 25 o c 0 o c battery voltage - v input voltage - v -20 0 20 40 60 80 100 120 0.24 0.26 0.28 0.30 0.32 0.34 0.36 dropout voltage vs temperature v(do) - dropout voltage - v ta - temperature - o c 20 30 40 50 60 70 80 90 100 110 390 400 410 420 430 440 450 460 kset linearity vs charge current 85 o c 25 o c 0 o c kset - a/a battery charge current - ma n~n?t?m?w3^v?mw`r?y?b?g ?pqls? tel: 0755-8398 3377 / 135 9011 2223 http://www.gofotech.com v?mw`r?y?b? www.gofotech.com
eup8060x ds8060x ver 1.0 may 2008 10 state machine diagram figure 15. operational flow chart n~n?t?m?w3^v?mw`r?y?b?g ?pqls? tel: 0755-8398 3377 / 135 9011 2223 http://www.gofotech.com v?mw`r?y?b? www.gofotech.com
eup8060x ds8060x ver 1.0 may 2008 11 typical application note: temp window set between 0 j and 45 j for application w/ts pin. figure 16. application circuit n~n?t?m?w3^v?mw`r?y?b?g ?pqls? tel: 0755-8398 3377 / 135 9011 2223 http://www.gofotech.com v?mw`r?y?b? www.gofotech.com
eup8060x ds8060x ver 1.0 may 2008 12 functional description the charge current is programmable using external components (r iset resistor). a typical charge profile is shown below, for an operation condition that does not cause the ic junction temperature to exceed t j(reg) , (112 j typical). figure 17.charging profile within t j(reg) if the operating conditions cause the ic junction temperature to exceed t j(reg), the charge cycle is modified, with the activation of the integrated thermal control loop. the thermal control loop is activated when an internal voltage reference, which is inversely proportional to the ic junction temperature, is lower than a fixed, temperature stable internal voltage. the thermal loop overrides the other charger control loops and reduces the charge current until the ic junction temperature returns to t j(reg) , effectively regulating the ic junction temperature. a modified charge cycle, with the thermal loop active, is shown in figure 18. figure 18.charging profile ,thermal loop active operating modes power down the eup8060x family is in a power-down mode when the input power voltage (in) is below the power-down threshold v (uvlo) . during the power down mode all ic functions are off, and the host commands at the control pins are not interpreted. the status output pins stat1 and stat2 are set to high impedance mode and pg output is set to the high impedance state. sleep mode the eup8060x enters the sl eep mode when the input power voltage (in) is above the power down threshold v (uvlo) but still lower than the input power detection threshold, v(in) < v(out) + v in(dt) . during the sleep mode the charger is off, and the host commands at the control pins are not interpreted. the status output pins stat1 and stat2 are set to the high impedance state and the pg output indicates input power not detected. the sleep mode is entered from any other state, if the input power (in) is not detected. overvoltage lockout the input power is detected when the input voltage v(in) > v(out) + v in(dt) . the eup8060x transitions from the sleep mode to the power-on-reset mode. in this mode of operation an internal timer t (por) is started. until the timer expires the stat1 and stat2 outputs indicate charger off, and the pg output indicates the input power status as not detected. at the end of the power-on -reset delay. the stat1, stat2 and pg pins are active. stand-by mode in the eup8060b/c the stand-by mode is started at the end of the power-on-reset phase, if the input power is detected and ce = hi. in the stand-by mode selected blocks in the ic are operational, and the control logic monitors system status and control pins to define if the charger will set to on or off mode. the quiescent current required in stand-by mode is 50 a typical. if the ce pin is not available the eup8060x enters the begin charge mode at the end of the power-on-reset phase. begin charge mode all blocks in the ic are powered up, and the eup8060x is ready to start charging the battery pack. a new charge cycle is started when the control logic decides that all conditions required to enable a new charge cycle are met. during the begin charge phase all timers are reset, after that the ic enters the charging mode. charge mode when the charging mode is active the eup8060x executes the charging algorithm, as described in the operational flow chart, figure 15. n~n?t?m?w3^v?mw`r?y?b?g ?pqls? tel: 0755-8398 3377 / 135 9011 2223 http://www.gofotech.com v?mw`r?y?b? www.gofotech.com
eup8060x ds8060x ver 1.0 may 2008 13 suspend mode the suspend mode is entered when the pack temperature is not within the valid temperature range. during the suspend mode the charger is set to off, but the timers are not reset. the normal charging mode resumes when the pack temperature is within range. ldo mode operation the ldo mode (tmr pin open circuit) disables the charging termination circuit, disables the battery detect routine and holds the safety timer clock in reset. this is often used for operation without a battery or in production testing. the out pin current can be monitored via the iset pin. if in ldo mode without a battery present, it is recommended that a 200 ? feedback resistor,r8, be used, see figure 16. control logic overview an external host can enable or disable the charging process using a dedicated control pin, ce . a low-level signal on this pin enables the charge, and a high-level signal disables the charge. the eup8060x is in stand-by mode with ce = hi. when the charger function is enabled ( ce = lo) a new charge is initiated. table 1 describes the charger control logic operation, in eup8060x versions without the ts pin the pack temp status is internally set to ok. in both standby and suspend modes the charge process is disabled. in the standby mode all timers are reset; in suspend mode the timers are held at the count stored when the suspend mode was set. the timer fault, termination and output short circuit variables shown in the control logic table are latched in the detection circuits, outside the control logic. refer to the timers, termination and short circuit protection sections for additional details on how those latched variables are reset. temperature qualification (applies only to versions with ts pin option) the eup8060x continuously monitors battery temperature by measuring the voltage between the ts and vss pins. an internal current source provides the bias for most common 10-k [ negative-temperature coefficient thermistors (ntc). the device compares the voltage on the ts pin against the internal v (ltf) and v (htf) thresholds to determine if charging is allowed. once a temperature outside the v (ltf) and v (htf) thresholds is detected the device immediately suspend the charge. the device suspend charge by turning off the power fet and holding the timer value (i.e. timers are not reset). charge is resumed when the temperature returns to the normal range. however the user may modify these thresholds by adding two external resistors. see figure 16. input overvoltage detectio n, power good status output the input power detection status for pin in is shown at the open collector output pin pg . table 2. input power detection status input power detection (in) pg state not detected high impedance detected, no overvoltage lo detected, overvoltage high impedance the eup8060x detects an in put overvoltage when v(in) > v (ovp) . the charger function is turned off and the eup8060x is set to standby mode of operation. the ovp detection is not latched, and the ic returns to normal operation when the fault condition is removed. table 1. control logic functionality eup8060x operation mode ce input power timer fault (latched) output short circuit termi -nation (latched) pack temp thermal shutdown power down charger power stage power down lo low x x x x x yes off sleep x not detected x x x x x no off standby hi detected x x x x x no off lo detected x yes x x x no lo detected no no yes x x no off lo detected yes no no x x no ifault lo detected no no yes absent t j t shut no off see state diagram lo over voltage no no no ok t j eup8060x ds8060x ver 1.0 may 2008 14 charge status outputs the open-drain stat1 and stat2 outputs indicate various charger operations as shown in table 3. these status pins can be used to drive leds or communicate to the host processor. note that off indicates the open- collector transistor is turned off. table 3. charge status (1) charge state stat1 stat2 precharge in progress on on fast charge in progress on off done (termination enabled only) off on charge suspend (temperature) timer fault charger off selected input power overvoltage detected battery absent batteryshort off off (1) pulse loading on the out pin may cause the ic to cycle between done and charging states (leds flashing) (2) when termination is disabled (tmr pin floating or te = hi, eup8060c) the done state is not available; the status leds indicate fast charge if v bat > v lowv and precharge if v bat < v lowv . the available output current is a function of the out pin voltage, see figure 23. battery charging: constant current phase theeup8060 family offers on-chip current regulation. the current regulation is defined by the value of the resistor connected to iset pin. during a charge cycle the fast charge current i o(out) is applied to the battery if the battery voltage is above the v (lowv) threshold (2.95 v typical): (3) where k (set) is the output current set factor and v (set) is the output current set voltage. during a charge cycle if the battery voltage is below the v (lowv) threshold a pre-charge current i (prechg) is applied to the battery. this feature revives deeply discharged cells. (4) where k (set) is the output current set factor and v (prechg) is the precharge set voltage. at low constant current char ge currents, less than 350 ma, it is recommended that a 0.47f capacitor be placed between the iset and bat pins to insure stability, see figure 16. charge current translator when the charge function is enabled internal circuits generate a current proportional to the charge current at the iset pin. this current, when applied to the external charge current programming resistor r iset generates an analog voltage that can be monitored by an external host to calculate the current sourced from the out pin. (5) battery voltage regulation the battery pack voltage is sensed through the bat pin, which is tied directly to the positive side of the battery pack. the eup8060x monitors the battery pack voltage between the bat and vss pins. when the battery voltage rises to v o(reg) threshold the voltage regulation phase begins and the charging current begins to taper down.the voltage regulation threshold v o(reg) is fixed by an internal ic voltage reference. pre-charge timer the eup8060x family activates an internal safety timer during the battery pre-conditioning phase. the charge safety timer time-out value is set by the external resistor connected to tmr pin, rtmr and the timeout constants k (pchg) and t (chg) : the pre-charge timer operation is detailed in table 4. table 4. pre-charge timer operational modes 8060x mode vout > v (lowv) pre-charge timer mode standby ( ce = hi) x reset charging yes reset suspend (ts out of range) yes reset suspend (ts out of range) no hold charging, tmr pin not open no counting, external programmed rate charging, tmr pin open x reset iset )set()set( )out(o r kv i)out(i == 10 i ~ r kv i)out(i )out(o iset )set()set( )prechg( == )set( iset k r )out(i)iset(v = )chg()pchg()pchg( tkt = n~n?t?m?w3^v?mw`r?y?b?g ?pqls? tel: 0755-8398 3377 / 135 9011 2223 http://www.gofotech.com v?mw`r?y?b? www.gofotech.com
eup8060x ds8060x ver 1.0 may 2008 15 in suspend mode the pre-charge timer is put on hold (i.e., pre-charge timer is not reset), normal operation resumes when the timer returns to the normal operating mode (counting). if v(bat) does not reach the internal voltage threshold v (lowv) within the pre-charge timer period a fault condition is detected, the charger is turned off and the pre-charge safety timer fault condition is latched. when the pre-charge timer fault latch is set the charger is turned off. under those c onditions a small current i fault is applied to the out pin, as long as input power (in) is detected and v(out) < v (lowv) , as part of a timer fault recovery protocol. this current allows the output voltage to rise above the pre-charge threshold v (lowv) , resetting the pre-charge timer fault latc h when the pack is removed. table 5 further details the pr e-charge timer fault latch operation. table 5. pre-charge timer latch functionality pre-charge timer fault entered when pre-charge timer fault latch reset at ce rising edge or ovp detected input power removed (not detected) pre-charge timer timeout and v(out) > v (lowv) timer function disabled thermal protection loop an internal control loop monitors the eup8060x junction termperature (t j ) to ensure safe operation during high power dissipations and or increased ambient temperatures. this loop monitors the eup8060x junction temperature and redu ces the charge current as necessary to keep the ju nction temperature from exceeding, t j(reg) , (112c, typical). the eup8060x 's thermal lo op control can reduce the charging current down to ~100ma if needed. if the junction temperature continues to rise, the ic will enter thermal shutdown. thermal shutdown and protection internal circuits monitor the junction temperature, t j , of the die and suspends charging if t j exceeds an internal threshold t (shut) (155c typical). charging resumes when t j falls below the internal threshold t (shut) by approximately 20c. dynamic timer function the charge and pre-charge sa fety timers are programmed by the user to detect a fault condition if th e charge cycle duration exceeds the total time expected under normal conditions. the expected charge time is usually calculated based on the fast charge current rate. when the thermal loop is activated the charge current is reduced, and eup8060x activates the dynamic timer control, an internal circuit that slows down the safety timer's clock frequency. the dynamic timer control circuit effectively extends the safety time duration for either the precharge or fast charge timer modes. this minimizes the chance of a safety timer fault due to thermal regulation. the eup8060x dynamic timer control (dtc) monitors the voltage at pin iset during pre-charge and fast charge, and if in thermal regulation slows the clock frequency proportionately to the change in charge current. the time duration is based on ripple counter, so slowing the clock frequency is a real time correction. the dtc circuit changes the safety timers clock period based on the v (set) /v (iset) ratio (fast charge) or v (prechg) /v (set) ratio (pre-charge). typical safety timer multiplier values relative to the v (set) /v (iset) ratio is shown in figure 19 and figure 20. charge termination detection and recharge the charging current is monitored during the voltage regulation phase. charge termination is indicated at the statx pins (stat1 = hi-z; stat2 = low) once the charge current falls below the termination current threshold i (term) . a deglitch period t dgl(term) is added to avoid false termination indication during transient events. charge termination is not dete cted if the charge current falls below the termination threshold as a result of the thermal loop activation. termination is also not detected when charger enters the suspend mode, due to detection of invalid pack temperature or internal thermal shutdown. table 6 describes the termination latch functionality. table 6. termination latch functionality termination detected latched when termination latch reset at ce rising edge or ovp detected new charging cycle started; see state diagram i(out)t dgl(term) and v(out) > v (rch) termination disabled n~n?t?m?w3^v?mw`r?y?b?g ?pqls? tel: 0755-8398 3377 / 135 9011 2223 http://www.gofotech.com v?mw`r?y?b? www.gofotech.com
eup8060x ds8060x ver 1.0 may 2008 16 the termination function is disabled: 1. in eup8060a/b/d the termination is disabled when the tmr pin is left open (floating). 2. in eup8060c leaving tmr pin open (floating) does not disable the termination. the only way to disable termination in the eup8060c is to set te = high. figure 19. safety tim er linearity internal clock period multiplication factor figure 20. safety timer linearity for r tmr values figure 21. oscillator linearity vs i tmr r tmr 30k ? -100k ? battery absent detection- voltage mode algorithm the eup8060x provides a battery absent detection scheme to reliably detect insertion and/or removal of battery packs. the detection circuit applies an internal current to the battery terminal, and detects battery presence based on the terminal voltage behavior. figure 22 has a typical waveform of the output voltage when the battery absent detection is enabled and no battery is connected: figure 22. battery-absent detection waveforms the battery absent detection function is disabled if the voltage at the bat pin is held above the battery recharge threshold, v (rch) , after termination detection. when the voltage at the bat pin falls to the recharge threshold, either by connection of a load to the battery or due to battery removal, the eup8060 begins a battery absent detection test. this test involves enabling a detection current, i det(down) , for a period of t (detect) and checking to see if the battery voltage is below the pre-charge threshold, v (lowv) . following this, the precharge current, i det(up) is applied for a period of t (detect) and the battery voltage checked again to be above the recharge threshold. passing both of the discharge and charging tests (battery terminal voltage being below the pre-charge and above the recharge thresholds on the battery detection test) indicates a battery absent fault at the stat1 and stat2 pins. failure of either test starts a new charge cycle. for the absent battery condition the voltage on the bat pin rises and falls between the v (lowv) and v o(reg) thresholds indefinitely. see the operation flowchart for more details on this algorith m. if it is desired to power a system load without a battery, it is recommended to float the tmr pin which puts the charger in ldd mode (disables termination). the battery absent detection function is disabled when the termination is disabled. n~n?t?m?w3^v?mw`r?y?b?g ?pqls? tel: 0755-8398 3377 / 135 9011 2223 http://www.gofotech.com v?mw`r?y?b? www.gofotech.com
eup8060x ds8060x ver 1.0 may 2008 17 charge safety timer as a safety mechanism th e eup8060x has a user -programmable timer that monitors the total fast charge time. this timer (charge safety timer) is started at the beginning of the fast charge period. the safety charge timeout value is set by the value of an external resistor connected to the tmr pin (r tmr ); if pin tmr is left open (floating) the charge safety timer is disabled. the charge safety timer time-out value is calculated as follows: the safety timer operation modes are shown in table 7 table 7. charge safety timer operational modes eup8060x vout > v (lowv) charge safety timer mode standby x reset charging no reset suspend no reset suspend yes suspend charging, tmr pin not open yes counting charging, tmr pin open x reset in suspend mode the charge safety timer is put on hold (i.e., charge safety timer is not reset), normal operation resumes when the ts fault is removed and the timer returns to the normal operating mode (counting). if charge termination is not reached within the timer period a fault condition is detected. under those circumstances the led status is updated to indicate a fault condition and the charger is turned off. when the charge safety timer fault latch is set and the charger is turned off a small current ifault is applied to the out pin, as long as input power (in) is detected and v(out) < v (rchg) , as part of a timer fault recovery protocol. this current allows the output voltage to rise above the recharge threshold v (rchg) if the pack is removed, and assures that the charge safety timer fault latch is reset if the pack is removed and re-inserted. table 8 further details the charge safety timer fault latch operation. table 8. charge safety timer latch functionality charge safety timer fault entered charge safety timer fault latch reset at ce rising edge or ovp detected input power removed (not detected) v(out) > v (low v) new charging cycle started; see state diagram short circuit protection the internal comparators monitor the battery voltage and detect when a short circuit is applied to the battery terminal. if the voltage at the bat pin is less than the internal threshold v(scind) (1.8v typical), the stat pins indicate a fault condition (stat1 = stat2 = hi-z). when the voltage at the bat pin falls below a second internal threshold v(sc) (1.4 v typical), the charger power stage is turned off. a recovery current, i(short) (22 ma typical), is applied to the bat pin, enabling detection of the short circuit removal. the battery output current versus battery voltage is shown in the graph, figure 23. figure 23. short circuit behavior see the application section for additional details on start-up operation with v(bat) < v (sc) . startup with deeply depleted battery connected the eup8060x charger furnishes the programmed charge current if a battery is detected. if no battery is connected the eup8060x operates as follows: the output current is limited to 22 ma (typical), if the voltage at bat pin is below the short circuit detection threshold v (sc) , 1.8 v typical. the output current is regulated to the programmed pre-charge current if v (sc) < v(bat) < v (lowv) . the output current is regulated to the programmed fast charge current if v(bat) > v (lowv) and voltage regulation is not reached. the output voltage collapses if no battery is present and the end equipment requires a bias current larger that the available charge current. ]rk[t )tmr()chg()chg( = n~n?t?m?w3^v?mw`r?y?b?g ?pqls? tel: 0755-8398 3377 / 135 9011 2223 http://www.gofotech.com v?mw`r?y?b? www.gofotech.com
eup8060x ds8060x ver 1.0 may 2008 18 packaging information tdfn-10 millimeters inches symbols min. max. min. max. a 0.70 0.80 0.028 0.031 a1 0.00 0.05 0.000 0.002 d 2.90 3.10 0.114 0.122 e1 1.70 0.067 e 2.90 3.10 0.114 0.122 l 0.30 0.50 0.012 0.020 b 0.18 0.30 0.007 0.012 e 0.50 0.020 d1 2.40 0.094 n~n?t?m?w3^v?mw`r?y?b?g ?pqls? tel: 0755-8398 3377 / 135 9011 2223 http://www.gofotech.com v?mw`r?y?b? www.gofotech.com

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