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standalone linear li-ion battery charger with thermal regulation china resources powtech (shanghai) limited www.crpowtech.com page 1 pt6112_ds rev en_1.0 pt6112 general description the pt6112 is a highly integrated li-ion battery linear charging management device targeted at space limited portable applications. the pt6112 offers an integrated mosfet and current sensor, reverse blocking protection, high accuracy curr ent and voltage regulation, charge status indication, and charge termination in a sot23 or esop8 package. the pt6112 has low external component count. the pt6112 charges a battery in three phases: trickle charging, constant current, and constant voltage. no external sense resistor is needed, and no blocking diode is required due to the internal mosfet architectur e. the thermal feedback regulates the charging current to limit the chip temperature during high power operation or high ambient temperature to maximize the charge rate without risk of overheating. the charge voltage is fixed at 4.2v, and the charge current can be programmed externally with a single resistor. the pt6112 automatically terminates th e charge cycle when the charge current drops to 1/10 the programmed value after the final float voltage is reached. the pt6112 automatically re-starts the charge if the battery voltage falls below an internal threshold. features z charges single cell li-ion batteries directly from usb port z programmable charge current up to 800ma z no mosfet, sense resistor or blocking diode required z complete linear charger in sot23-5 or esop8 package for single cell lithium-ion batteries z constant-current/constant-voltage operation with thermal regulation to maximize charge rate without risk of overheating z preset 4.2v charge voltage with 1% accuracy applications z cellular telephones, pdas, mp3 players z bluetooth applications z digital cameras z charging docks and cradles ordering information package temperature range ordering part number transfer media marking sot23-5 -40 to 85 PT6112E23E tape & reel 6112 esop8 -40 to 85 pt6112eeso tape & reel pt6112 xxxxxx typical application circuit key performance chart 0 20 40 60 80 100 120 0 100 200 300 400 500 600 700 3.80 3.85 3.90 3.95 4.00 4.05 4.10 4.15 4.20 4.25 complete charging cycle(900mah battery) charge terminated constant voltage charge current(ma) time ( minutes ) constant current v cc =5v, r prog =1.65k, t a =25? battery voltage(v)
standalone linear li-ion battery charger with thermal regulation china resources powtech (shanghai) limited www.crpowtech.com page 2 pt6112_ds rev en_1.0 pt6112 pin assignment pt6112 1 2 3 4 bat gnd vcc sot23-5 chg 5prog top view pin descriptions names sot23-5 esop8 pin no. description 1 1 chg open-drain charges status output. 2 7 gnd ground 3 6 bat charge current output. the positive side of battery. 4 3 vcc positive input supply voltage. 5 2 prog charge current program, charge current monitor and shutdown pin. 4,5,8 nc not connection absolute maximum ratings (note1) sym parameter value v cc input supply voltage -0.3 to 7 prog -0.3 to 7 bat -0.3 to 7 chg -0.3 to 7 bat short-circuit duration continuous bat pin current 1000 ma operating ambient temperature range -40 to 85 storage temperature range -65 to 125 lead temperature soldering, 10sec 260 p tr1 package thermal resistance, esop-8 ja 45 o c /w p tr2 package thermal resistance, sot-23-5 ja 220 o c /w
standalone linear li-ion battery charger with thermal regulation china resources powtech (shanghai) limited www.crpowtech.com page 3 pt6112_ds rev en_1.0 pt6112 recommended operating range (note 2) symbol parameter value v cc input supply voltage 4.25 to 5.5 note 1: absolute maximum ratings indicate limits beyond which damage to the device may occur. note 2: recommended operating range indicates conditions for which the device is functional, but does not guarantee specific performance limits. electrical characteristics (note 3,4,5) specifications are at t a =25 , v cc =5v, unless otherwise noted symbol parameters conditions min typ max units v cc input supply voltage 4.25 5.5 v charge mode (note 6) , r prog =10k 200 500 a standby mode(charge terminated) 100 200 a i cc input supply current shut down mode: r prog not connected , v cc < v bat, or v cc < v uv 50 100 a v float regulated output (float) voltage 0 t a 85 , i bat = 40ma 4.158 4.2 4.242 v r prog =10k, current mode 100 ma r prog =2k, current mode 450 500 535 ma standby mode, v bat =4.2v 0 -2.5 -6 a shutdown mode(r prog not connected) 1 2 a i bat bat pin current sleep mode, v cc =0v 1 2 a i trikl trickle charge current v bat < v trikl , r prog =2k 50 ma v trikl trickle charge threshold voltage r prog =10k, v bat rising 2.65 2.9 3.15 v v trhys trickle charge hysteresis voltage r prog =10k 80 mv v uv v cc undervoltage lockout threshold from v cc low to high 3.6 3.8 3.98 v v uvhys v cc undervoltage lockout hysteresis 200 mv prog pin rising 1.21 v v msd manual shutdown threshold voltage prog pin falling 1.0 v v cc from low to high 100 mv v asd v cc ? v bat lockout threshold voltage v cc from high to low 30 mv r prog =10k 0.10 ma/ma i term c/10 termination current threshold r prog =2k 0.10 ma/ma v prog prog pin voltage r prog =10k, current mode 1.0 v
standalone linear li-ion battery charger with thermal regulation china resources powtech (shanghai) limited www.crpowtech.com page 4 pt6112_ds rev en_1.0 pt6112 electrical characteristics (continued) (note 3,4,5) symbol parameters conditions min typ max units i chg chg pin weak pull-down current v chg =5v 3 6 15 a v chg chg pin output low voltage i chg =5ma 0.35 0.8 v v rechg recharge battery threshold voltage v float - v chg 150 mv t lim junction temperature in constant temperature mode 120 r on power fet ?on? resistance(between vcc and bat) 600 m ? t ss soft-start time i bat =0 to i bat =1000v/ rprog 100 s t rechg recharge comparator filter time v bat high to low 2 ms t term termination comparator filter time i bat falling below i chg /10 1000 s i prog prog pin pull-up current 3 a note 3: electrical characteristics state dc and ac electrical specifications under particular test conditions which guarantee specific performance limits. this assumes that the device is within the recommended operating range. specifications are not guaranteed for parameters where no limit is given, however, the typical value is a good indication of device performance. note 4: typicals are measured at 25 ? c and represent the parametric norm. note 5: datasheet min/max specification limits are guarant eed by design, test, or statistical analysis. note 6: supply current includes prog pin current (approximately 100ua) but does not include any current delivered to the battery through the bat pin (approximately 100ma).
standalone linear li-ion battery charger with thermal regulation china resources powtech (shanghai) limited www.crpowtech.com page 5 pt6112_ds rev en_1.0 pt6112 simplified block diagram v a c3 c2 t a c a 120 o c t die m a 1x 1000x bat 3 vref 1.21v r1 r2 1.5ua c1 shdn bat 2.9v v cc 3ua r3 r4 r5 1v 0.1v standby chg 5 1 2 prog gnd 4 v cc operation description the pt6112 is a standalone linear li-ion battery charger with thermal regulation. with the internal 0.6 ohms mosfet, the minimum operating voltage can be less than 4.25v. one external 1% precision resistor is required to set the charging current value. when the voltage at the vcc pin rises above the uvlo threshold, the normal charging cycle begins. if the battery voltage is less than 2.9v, the device will operate in a trickle charging mode. the charging current in the trickle charging mode is 1/10 th of the programmed value, which effectively protects the battery from damage and prolongs its lifetime. when the voltage at the bat pin rises above 2.9v, the charger enters the constant-current mode in which case the charging current equals to the programmed value. once the voltage at the bat pin reaches 4.2v, the charger goes into the constant voltage mode where the charging current decreases. once the charging current drops to 1/10 th the programmed value, the charging cycle ends. after a charge cycle is complete and the charging operation is terminated, the pt6112 keeps monitoring the bat voltage. it will recharge the battery as soon as the bat voltage drops below 4.05v. the pt6112 includes a soft-start circuit to minimize the inrush current at the start of a ch arge cycle. when the prog pin is floating, the charger goes into the shutdown mode. it acts as chip enable pin.
standalone linear li-ion battery charger with thermal regulation china resources powtech (shanghai) limited www.crpowtech.com page 6 pt6112_ds rev en_1.0 pt6112 typical performance characteristics note: typical characteristics are obtained under th e following conditions unless otherwise noted: rprog: 10k v cc =5v, vbat=3.6v, t a =25 cin: 1f, ceramic type cout: 1f , ceramic type charging current vs temperature rprog=10k vcc=5v vbat=3.6v 85 90 95 100 105 110 115 -40 -20 0 20 40 60 85 temperature() charging current(ma) &kdujlqjfxuuhqw967hpshudwxuh 5surj .9&& 99%$7 9627 7hpshudwxuh &kdujlqjfxuuhqwp$ 6kxwgrzqjurxqgfxuuhqw967hpshudwxuh 5surjlvrshq9&& 99%$7 9 7hpshudwxuh 6kxqgrzqjurxqgfxuuhqwx$ :runlqjjurxqgfxuuhqw967hpshudwxuh 7hpshudwxuh :runlqjjurxqgfxuuhqwx$
standalone linear li-ion battery charger with thermal regulation china resources powtech (shanghai) limited www.crpowtech.com page 7 pt6112_ds rev en_1.0 pt6112 typical performance char acteristics (continued) vfloat vs temperature rprog=10k vcc=5v ibat=40ma 4.15 4.16 4.17 4.18 4.19 4.2 4.21 4.22 4.23 4.24 4.25 -40-200 20406085 temperature() vfloat(v) 352*slqyrowdjh967hpshudwxuh 9&& 95surj .9%$7 9 7hpshudwxuh 352*slqyrowdjh9 352*slqyrowdjh966xsso\yrowdjh 5surj .9%$7 7$ 6xsso\yrowdjh9 352*slqyrowdjh9 9iordw966xsso\yrowdjh 5surj .9%$7 97$ 6xsso\yrowdjh9 9iordw9 7ulfnohfkdujhfxuuhqw966xsso\yrowdjh 5surj .9%$7 7$ 6xsso\yrowdjh9 7ulfnohfkdujhfxuuhqwp$ &kdujhfxuuhqw966xsso\yrowdjh 5surj .9%$7 97$ 627 6xsso\yrowdjh9 &kdujhfxuuhqwp$
standalone linear li-ion battery charger with thermal regulation china resources powtech (shanghai) limited www.crpowtech.com page 8 pt6112_ds rev en_1.0 pt6112 charge current vs battery voltage vcc=5v rprog=2k ta=25 sot23-5 0 100 200 300 400 500 600 2.00 2.50 2.80 2.89 2.90 3.00 3.10 3.20 3.30 3.40 3.50 3.60 3.70 3.80 3.90 4.00 4.10 4.20 battery voltage(v) charge current(ma) application information adjusting charging current the charging current is programmed using 1% precision resistor from prog pin to ground. the charging current and the programming resistor are calculated using the following equations: r prog =1000v/i chg , i chg =1000v/r prog charge status indicator the charging status indicator pin has three different states: strong pull down(about 10ma current sink), weak pull down(about 6a current sink), and high impedance. the strong pull down mode indicates the pt6112 is in a charging cycle. a weak pull down mode indicates the vcc reaches the uvlo and the charger is ready to charge. the high impedance indicates the pt6112 is in under voltage lock out (uvlo) mode: either vcc is less than 100mv above the bat pin voltage or insufficient voltage is applied to the vcc pin. a microprocessor can distinguish the three states. thermal limiting an internal thermal fee dback loop reduces the programmed charge curren t if the die temperature attempts to rise above a preset value of approximately 120 . this feature protects the pt6112 from excessive temperature and allows the user to push the limits of the power handling capability of a given circuit board without risk of damaging the pt6112. the conditions that cause the pt6112 to reduce charge current through thermal feed back can be approximated by considering the power diss ipated in the ic. nearly all of this power dissipation is generated by the internal mosfet?this is calculated to be approximately: pd = (v cc ? v bat ) ? i bat where pd is the power dissipated v cc is the input supply voltage v bat is the battery voltage i bat is the charge current. the approximate ambient te mperature at which the thermal feedback begins to protect the ic is: t a = 120 ? pd? ja t a = 120 ? (v cc ? v bat ) ? i bat ? ja reducing the voltage drop across the internal mosfet can significantly decrease th e power dissipation in the ic. this has the effect of increasing the current delivered to the battery during thermal regulation. one method is by dissipating some of the power through an external component, such as a resistor or diode. by dropping voltage across a resistor in series with a 5v wall adapter, the on-chip power dissipation can be decreased, thus increasing the thermally regulated charge current.
standalone linear li-ion battery charger with thermal regulation china resources powtech (shanghai) limited www.crpowtech.com page 9 pt6112_ds rev en_1.0 pt6112 undervoltage lockout (uvlo) an internal undervoltage lockout circuit monitors the input voltage and keeps the charger in shutdown mode until vcc rises above the undervoltage lockout threshold. the uvlo circuit has a built-in hysteresis of 200mv. furthermore, to prot ect against reverse current in the power mosfet, the uvlo circuit keeps the charger in shutdown mode if vcc falls to within 30mv of the battery voltage. if the uvlo comparator is tripped, the charger will not come out of shutdown mode until v cc rises 100mv above the battery voltage. stability considerations the constant-voltage mode feedback loop is stable without an output capacitor provided a battery is connected to the charger output. with no battery present, an output capacito r is recommended to reduce ripple voltage. in constant current mode, the prog pin is in the feedback loop, not the battery. the constant-current mode stability is affected by the impedance at the prog pin. with no additional capacitance on the prog pin, the charger is stable with the programming resistor value as high as 20k. however, additional capacitance on this node reduces the maximum allowed program resistor. the pole frequency at the prog pin should be kept above 100khz. adapter/usb applications for usb or adapter application, there is 10% voltage variation in the power supply; this device should be damaged if input voltage is higher than 5.5v. to protect the device, a 5.6v break down diode is suggested connects between v cc and gnd in this kind of applications. external component selection guide z output capacitors with no battery present, an output capacitor is recommended to reduce ripple voltage. when using high value, low esr ceramic capacitors, it is recommended to add a 1 ? resistor in series with the capacitor. no series resistor is needed if tantalum capacitors are used. z programmed resistor use a resistor with 1% precision to increase the charging current accuracy.
standalone linear li-ion battery charger with thermal regulation china resources powtech (shanghai) limited www.crpowtech.com page 10 pt6112_ds rev en_1.0 pt6112 package information esop8 package
standalone linear li-ion battery charger with thermal regulation china resources powtech (shanghai) limited www.crpowtech.com page 11 pt6112_ds rev en_1.0 pt6112 package information sot23-5 millimeters symbol min typ max a - - 1.25 a1 0 - 0.15 a2 1.00 1.10 1.20 a3 0.60 0.65 0.70 b 0.36 - 0.50 b1 0.36 0.38 0.45 c 0.14 - 0.20 c1 0.14 0.15 0.16 d 2.826 2.926 3.026 e 2.60 2.80 3.00 e1 1.526 1.626 1.726 e 0.95bsc e1 1.90bsc l 0.35 0.45 0.60 l1 0.59ref l2 0.25bsc r 0.10 - - r1 0.10 - 0.25 0 - 8 1 3 5 7 2 6 8 10

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