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eup8051 ds8051 ver 1.6 sep. 2006 1 low cost 1a linear battery charge controllers description the eup8051 is a single lithium-ion (li-ion) and lithium?polymer (li-pol) linear charge management controller for use in cost sensitive and portable applications. it combines high accuracy constant-current and constant-voltage regulation, cell preconditioning, temperature monitoring, automatic charge termination, charge-status indication, in a space-saving msop-8 package. the eup8051 applies a constant current up to 1a to the battery and the charge current can be programmed externally with a sense-resistor. the eup8051 automatically terminates the charge cycle when the charge current drops to the charge termination threshold (i term ) after the charge-regulation voltage is reached. when the input supply is removed, the eup8051 automatically enters a low-power sleep mode, dropping the battery drain current to less than 1a. a battery charge state output pin is provided to indicate battery charge status through a display led. the battery charge status output is a seri al interface which may also be read by a system microcontroller. features z programmable charge current up to 1a z 4.5v-7v input voltage range z ideal for single cell (4.1v or 4.2v) li-ion or li-pol batteries z preset charge voltage with 1% accuracy z constant-current/constant voltage operation z preconditioning of low voltage cells z optional cell-temperature monitoring before and during charge z charge status indication z automatic battery recharge z charge termination by minimum current z automatic low-power sleep mode when input power is removed z available in msop-8,tssop-8 and sop-8 package z rohs compliant and 100% lead (pb)-free applications z cellular phones / pdas/ mp3 players/dsc z handheld instruments
eup8051 ds8051 ver 1.6 sep. 2006 2 typical application circuit
eup8051 ds8051 ver 1.6 sep. 2006 3 pin configurations part number pin configurations eup8051 msop-8 eup8051 tssop-8 eup8051 sop-8 pin description pin msop-8 tssop-8 sop-8 i/o description vcc 1 3 1 i supply voltage input ts 2 4 2 i temperature sense input stat 3 5 3 o charge status output vss 4 6 4 ground cc 5 7 5 o charge control output fb/ce 6 8 6 i external feedback input or charge enable function. input from controller or finely adjust the battery regulated voltage with external voltage divider sns 7 1 7 i current sense input bat 8 2 8 i battery voltage input
eup8051 ds8051 ver 1.6 sep. 2006 4 ordering information order number package type markin g operating temperature range eup8051-41mir1 msop-8 xxxx 8051 -20 c to 70c eup8051-42mir1 msop-8 xxxx 8051c -20 c to 70c EUP8051-42QIR1 tssop-8 xxxx 8051n -20 c to 70c eup8051-42dir1 sop-8 xxxx eup8051 n -20 c to 70c eup8051- ?? ?? ?? ?? ?? ?? lead free code 1: lead free 0: lead packing r: tape& reel operating temperature range i: industry standard package type m: msop q: tssop d: sop output voltage 41: 4.1v 42: 4.2v
eup8051 ds8051 ver 1.6 sep. 2006 5 absolute maximum ratings ? supply voltage, (vcc with respect to gnd ) ------------------------------------------------------ -0.3 to +7v ? input voltage, sns, bat, ts, pi (all with respect to gnd)-------------------------- -0.3v to v cc +0.3v ? sink current (stat pin) not to exceed p d -------------------------------------------------------------- 20ma ? source current (stat pin) not to exceed p d ---------------------------------------------------------- 10ma ? output current (cc pi n) not to exceed p d -------------------------------------------------------------- 40ma ? maximum junction temperature, t j ------------------------------------------------------------------- 150c ? storage temperature range, tstg ------------------------------------------------------------- -65c to 150c ? lead temperature (soldering, 10s) ------------------------------------------------------------------ 300c ? package thermal resistance, ja - msop8 ---------------------------------------------------------- 80c/w recommended operating conditions min. max. unit supply voltage, v cc 4.5 7 v operating free-air temperature range, t a -20 70 c electrical characteristics over recommended operating free-air temperature range eup8051 symbol parameter conditions min. typ. max. unit i (vcc) v cc current v cc =5v >v cc(min) , excluding external loads 0.6 1 ma i (vccs) v cc sleep current v (bat) v (min) , v (bat) -v cc 0.8v 2 6 a i ib(bat) input bias current on bat pin v (bat) =v (reg) 1 a i ib(sns) input bias current on sns pin v (sns) =5v 1 a i ib(ts) input bias current on ts pin v (ts) =5v 1 a i ib(pi) input bias current on pi pin v (pi) =5v 1 a battery voltage regulation eup8051-4.1 4.059 4.10 4.141 v o(reg) output voltage eup8051-4.2 4.158 4.20 4.242 v
eup8051 ds8051 ver 1.6 sep. 2006 6 electrical characteristics over recommended operating free-air temperature range eup8051 symbol parameter conditions min. typ. max. unit v (sns) current regulation threshold voltage at pin sns, relative to v cc 198 220 242 mv charge termination detection i (term) charge termination current detect threshold voltage at pin sns, relative to v cc 0c t a temperature comparator v (ts1) lower temperature threshold 29 30 31 v (ts2) upper temperature threshold ts pin voltage 58 60 62 % v cc precharge comparator eup8051-4.1 2.94 3 3.06 v(min) precharge threshold eup8051-4.2 3.04 3.1 3.16 v precharge current regulation voltage at pin sns, relative to v cc 0c t a t a v rch comparator(battery recharge threshold) v (rch) recharge threshold eup8051-4.1 and eup8051-4.2 v o(reg) - 98mv v o(reg) - 100mv v o(reg) - 102mv v stat pin v ol(stat) output(low)voltage i ol =10ma 0.5 v oh(stat) output(high)voltage i oh =5ma v cc -0.5 v cc pin v ol(cc) output low voltage i o(cc) =5ma(sink) 1.5 v i o(cc) sink current not to exceed power rating specification(p d ) 5 40 ma
eup8051 ds8051 ver 1.6 sep. 2006 7 typical operating characteristics -20 0 20 40 60 80 4.00 4.05 4.10 4.15 4.20 4.25 4.30 4.35 4.40 battery voltage regulation vs. temperature battery voltage regulation(v) temperature( o c) -20 0 20 40 60 80 3.90 3.95 4.00 4.05 4.10 4.15 4.20 4.25 4.30 battery recharge threshold vs. temperature battery recharge threshold(v) temperature( o c) -20 0 20 40 60 80 2.90 2.95 3.00 3.05 3.10 3.15 3.20 3.25 3.30 precharge threshold vs. temperature precharge threshold(v) temperature( o c) -20 0 20 40 60 80 800 900 1000 1100 1200 1300 current regulation vs. temperature current regulation(ma) temperature( o c) -20 0 20 40 60 80 60 80 100 120 140 precharge threshold(ma) precharge threshold vs. temperature temperature( o c) 4.5 5.0 5.5 6.0 6.5 7.0 4.00 4.05 4.10 4.15 4.20 4.25 4.30 4.35 4.40 battery voltage regulation vs. supply voltage battery voltage regulation(v) supply voltage(v)
eup8051 ds8051 ver 1.6 sep. 2006 8 4.55.05.56.06.5 800 900 1000 1100 1200 1300 current regulation vs. supply voltage current regulation (ma) supply voltage(v) 4.55.05.56.0 60 80 100 120 140 precharge threshold vs. supply voltage precharge threshold(ma) supply voltage(v)
eup8051 ds8051 ver 1.6 sep. 2006 9 application information functional description the eup8051 is an advanced 1a linear charge controller for single li-ion of li-pol applications. refer to blocking diagram (figure3) and operation flow chart (figure4) in this section.
eup8051 ds8051 ver 1.6 sep. 2006 10 power on reset v min > v bat sleep mode temperature fault no no no no figure4. operation flow chart v cc applied temperature test ts>v ts1 tsv bat voltage phase test i bat >i term charge termination recharge test v rch >v bat constant current charging mode constant voltage charging mode yes yes yes yes no no
eup8051 ds8051 ver 1.6 sep. 2006 11 qualification and precharge when power is applied, the eup8051 starts a charge-cycle if a battery is already present or when a battery is inserted. charge qualification is based on battery temperature and voltage. the eup8051 suspends charge if the battery temperature is outside the v (ts1) to v (ts2) range and suspends charge until the battery temperature is within the allowed range. the eup8051 also checks the battery voltage. if the battery voltage is below the precharge threshold v(min), the eup8051 uses precharge to condition the battery. the conditioning charge rate i (prechg) is set at approximately 10 % of the regulation current. the conditioning current also minimizes heat dissi pation in the external pass-element during the initial stage of charge. see figure5 for a typical charge-profile. current regulation phase the eup8051 regulates current while the battery-pack voltage is less than the regulation voltage, v o(reg) . the eup8051 monitors charge current at the sns input by the voltage drop across a sense-resistor, r sns , in series with the battery pack. in current sensing configuration (figure6), r sns is between the vcc and sns pins, charge-current feedback, applied through pin sns, maintains a voltage of v (sns) across the current sense resistor. the following formula calculates the value of the sense resistor: o(reg) i (sns) v sns r = ---------------------------- (1) where i o(reg) is the desired charging current. example: for 0.55a, r sns : 0.22v/0.55a: 0.4 ? for 1.0a, r sns : 0.22v/1.0a: 0.22 ? voltage regulation phase the voltage regulation feedback is through the bat pin. this input is tied directly to the positive side of the battery pack. the eup8051 monitors the battery-pack voltage between the bat and vss pins. the eup8051 is offered in two fixed-voltage versions:4.1v, 4.2v. fb/ce pin function this pin has two functions, one is to enable/disable the charge function, and the other is to finely adjust battery regulation voltage. connect this pin to vdd to enable eup8051, and connect to ground to disable it (figure7). if this pin is connected to a voltage divider as shown in figure8, it can be a 2.15v reference voltage to adjust the output regulation voltage as desired.
eup8051 ds8051 ver 1.6 sep. 2006 12 charge termination and recharge the eup8051 monitors the charging current during the voltage-regulation phase. the eup8051 declares a done condition and terminates charge when the current drops to the charge termination threshold, i (term) . a new charge cycle begins when the battery voltage falls below the v (rch) threshold. battery temperature monitoring the eup8051 continuously monitors temperature by measuring the voltage between the ts and vss pins. a negative-or a positive-temperature coefficient thermistor (ntc, ptc) and an external voltage divider typically develop this voltage (see figure9). the eup8051 compares this voltage against its internal v (ts1) and v (ts2) thresholds to determine if charging is allowed. (see figure10). the temperature sensing circuit is immune to any fluctuation in vcc, since both the external voltage divider and the internal thresholds (v (ts1) and v (ts2) ) are referenced to vcc. the resistor values of r (t1) and r (t2) are calculated by the following equations: for ntc thermistors ) th r - tc (r 3 tc r th r 5 t1 r = ----------------------- (3) ] ) th r (7 - ) tc (r 2 [( tc r th r 5 t2 r = --------------- (4) for ptc thermistors ) tc r - th (r 3 tc r th r 5 t1 r = ---------------------- (5) ] ) tc r (7 - ) th (r 2 [( tc r th r 5 t2 r = ------------- (6) where r (tc) is the cold temperature resistance and r (th) is the hot temperature resi stance of thermistor, as specified by the thermistor manufacturer. r t1 or r t2 can be omitted if only one temperature (hot or cold) setting is required. applying a voltage between the v (ts1) and v (ts2) thresholds to pin ts disables the temperature-sensing feature. )v fb2 r fb1 r (1 2.15 o(reg) v + =
eup8051 ds8051 ver 1.6 sep. 2006 13 charge inhibit function the ts pin can be used as charge-inhibit input. the user can inhibit charge by connecting the ts pin to vcc or vss (or any level outside the v (ts1) to v (ts2) thresholds). applying a voltage between the v (ts1) and v (ts2) thresholds to pin ts returns the charger to normal operation. charge status indication the eup8051 reports the status of the charger on the 3-state stat pin. the following table summarized the operation of the stat pin. condition stat pin battery conditioning and charging high charge complete(done) low temperature fault or sleep mode hi-z the stat pin can be used to drive a single led (figure1), dual-chip leds (figure2) or for interface to a host or system processor (figure11). when interfacing the eup8051 to a processor, the user can use an output port, to recognize the high-z state of the stat pin. in this configuration, the user needs to read the input pin, toggle the output port and read the stat pin again. in a high-z condition, the input port always matches the signal level on the output port. low-power sleep mode when the input supply is disconnected, the charger automatically enters power-saving sleep mode. only consuming an ultra-low 1a in sleep mode, the eup8051 minimizes battery drain when it is not charging. selecting input capacitor in most applications, all that is needed is high-frequency decoupling capacitor. a 0.1f ceramic, placed in proximity to vcc and vss pins, works well. the eup8051 works with both regulated and unregulated external dc supplies. if a non-regulated supply is chosen, the supply unit should have enough capacitance to hold up the supply voltage to the minimum required input voltage at maximum load. if not, more capacitance must be added to the input of the charger. selecting output capacitor the eup8051 does not require any output capacitor for loop stability. in order to maintain good ac stability in the constant voltage mode, a minimum capacitance of 10f is recommenced to bypass the v bat pin to v ss . this capacitance provides compensation when there is no battery load. in addition, the battery and interconnections appear inductive at high frequencies. these elements are in the control feedback loop d ?? uring constant voltage mode. therefore, the bypass capacitance may be necessary to compensate for the inductive nature of the battery pack. virtually any good quality output filter capacitor can be used, independent of the capacitor?s minimum esr (effective series resistance) value. the actual value of the capacitor and its associated esr depends on the forward transconductance (gm) and capacitance of the external pass transistor. a 10f tantalum or aluminum electrolytic capacitor at the output is usually sufficient to ensure stability for up to a 1a output current. selecting an external pa ss-device (pmos or pnp) the eup8051 is designed to work with both p-channel mosfet or pnp transistor. the device should be chosen to handle the required power dissipation, given the circuit parameters, pcb layout and heat sink configuration. the following examples illustrate the design process for pmos device: p-channel mosfet selection steps for a p-channel mosfet: we will use the following conditions: v i =5v (with 10% supply tolerance); i (reg) =1a, 4.2-v single-cell li-ion. v i is the input voltage to the charger and i (reg) is the desired charge current. (see figure2)
eup8051 ds8051 ver 1.6 sep. 2006 14 1. determine the maximum power dissipation, p d , in the transistor. the worst case power dissipation happens when the cell voltage, v (constant) , is at its lowest (typically 3.1v at the beginning of current regulation phase) and v i is at its maximum. where v d is the forward voltage drop across the reverse-blocking diode (if one is used), and v cs is the voltage drop across the current sense resistor. p d =(v i(max) ?e v d ?e v cs ?e v bat ) ?? i reg --------- (7) p d =(5.5 ?e 0.4 ?e 0.2 ?e 3.1) ?? 1a p d =1.8w 2. determine the package size needed in order to keep the junction temperature below the manufacturer?s recommended value, t jmax . calculate the total theta, (c/w), needed. d p ) a(max) t - max(j) (t ja = - -------------(8) 1.8 40) - (150 ja = ja = 61c/w it is recommended to choose a package with a lower ja than the number calculated above. 3. select a drain-source voltage, v (ds) , rating greater than the maximum input voltage. a 12v device will be adequate in this example. 4. select a device that has at least 50 % higher drain current (i d ) rating than the desired charge current i (reg ). 5. verify that the available drive is large enough to supply the desired charge current. v (gs) =(v d +v (cs) +v ol(cc) ) ?e v i(min) -------------- (9) v (gs) =(0.4+0.2+1) ?e 4.5 v (gs) =-2.9 where v (gs) is the gate-to-source voltage, v d is the forward voltage drop across the reverse-blocking diode (if one is used), and v cs is the voltage drop across the current sense resistor, and v ol(cc) is the cc pin output low voltage specification for the eup8051. select a mosfet with gate threshold voltage, v (gsth) , rating less than the calculated v (gs) . reverse blocking protection the optional reverse-blocking protection diode, depicted in figure1&2 provides protection from a faulted or shorted input, or from a reversed-polarity input source. without the protection diode, a faulted of shorted input would discharge the battery pack through the body diode of the external pass transistor. if a reverse-protection diode is incorporated in the design, it should be chosen to handle the fast charge current continuously at the maximum ambient temperature. in addition, the reverse-leakage current of the diode should be kept as small as possible.
eup8051 ds8051 ver 1.6 sep. 2006 15 packaging information 8-pin msop note 1. package body sizes exclude mold flash and gate burrs 2. dimension l is measured in gage plane 3. tolerance 0.10mm unless otherwise specified 4. controlling dimension is millimeter. converted inch dimensions are not necessarily exact. dimensions in millimeters dimensions in inches symbols min. nom. max. min. nom. max. a 0.81 0.95 1.10 0.032 0.0375 0.043 a1 0.05 0.09 0.15 0.002 0.004 0.006 a2 0.76 0.86 0.97 0.030 0.034 0.038 b 0.28 0.30 0.38 0.011 0.012 0.015 c 0.13 0.15 0.23 0.005 0.006 0.009 d 2.90 3.00 3.10 0.114 0.118 0.122 e 4.70 4.90 5.10 0.185 0.193 0.201 e1 2.90 3.00 3.10 0.114 0.118 0.122 e ------ 0.65 ----- ------ 0.026 ------ l 0.40 0.53 0.66 0.016 0.021 0.026 y ------ ------ 0.10 ------ ------ 0.004 0 ------ 6 0 ------ 6
eup8051 ds8051 ver 1.6 sep. 2006 16 8-pin tssop note 1. package body sizes exclude mold flash protrusions or gate burrs 2. tolerance 0.10mm unless otherwise specified 3. coplanarity: 0.1mm 4. controlling dimension is millimeter. converted inch dimensions are not necessarily exact. 5. followed from jedec mo-153 dimensions in millimeters dimensions in inches symbols min. nom. max. min. nom. max. a ------ ------ 1.20 ------ ------ 0.048 a1 0.05 ------ 0.15 0.002 ------ 0.006 a2 0.80 1.00 1.05 0.031 0.039 0.041 b 0.19 ------ 0.30 0.007 ------ 0.012 c 0.09 ------ 0.20 0.004 ------ 0.008 d 2.90 3.00 3.10 0.114 0.118 0.122 e 6.20 6.40 6.60 0.244 0.252 0.260 e1 4.30 4.40 4.50 0.169 0.173 0.177 e ------ 0.65 ----- ------ 0.026 ------ l 0.45 0.60 0.75 0.018 0.024 0.030 y ------ ------ 0.10 ------ ------ 0.004 0 ------ 8 0 ------ 8
eup8051 ds8051 ver 1.6 sep. 2006 17 sop-8 z y x standard solder map dimension in millimeters dimension in inches symbols min. max. min. max. a 4.80 5.00 0.189 0.197 b 5.80 6.20 0.228 0.244 c 3.80 4.00 0.150 0.157 d 1.194 1.346 0.047 0.053 e 1.45 1.55 0.057 0.061 h 0.00 0.10 0.000 0.004 f 0.33 0.51 0.013 0.020 l1 0.19 0.25 0.007 0.010 l2 0.40 1.27 0.016 0.050 m 0 8 0 8 n 40 50 40 50

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