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APM8601 dual channel single cell linear lithium battery charger with 28v ovp and programmable charge timer APM8601 document number: ds35138 rev. 1 - 2 1 of 14 www.diodes.com december 2010 ? diodes incorporated new product description the APM8601 is a dual input channel linear li-ion charger for portable equipment that is optimized for small form-factor applications. the charge algorithm in the APM8601 covers all the charge requirements for a single li-ion battery cell. included is pre-charging for deeply discharg ed cells, constant current / constant voltage fast charging and a top-off feature to bring the cell safely to a full-charge level. the battery is constantly moni tored for overvoltage, charge time and cell temperature to ensure safe charging. a fault is triggered once the charge time exceeds a value that is programmable using a single capacitor and the temperature measurement is achieved thr ough a thermistor positioned close to the battery cell. the APM8601 automatically selects the usb or dc input, depending on which is valid (dc has priority if both are valid). the charging current from the usb input is set to 100ma or 500ma based on the logic level of the usel input. the APM8601 is packaged in u-dfn3030-14 package with a thermal pad. applications ? handheld consumer devices ? cell phones, pdas, mp3 players ? handheld test equipment ? digital still cameras ? multimedia players pin assignments figure 1. pin out features ? linear lithium ion / lithium polymer charging ic ? supply input safe up to 28v ? fast charging with maximum current of 1a ? 100ma/500ma usb charge current selected with usel ? resistor-programmable charging current ? resistor programmable end-of-charge ? capacitor programmable charge timer ? three charge indicator pins for a status display ? thermal protection ? dfn3030-14: available in ?green? molding compound (no br, sb) ? lead free finish/ rohs compliant (note 1) note 1. eu directive 2002/95/ec (rohs). all applicable rohs exemptions applied. please visit our website at http:// www.diodes.com/products/lead_free.html . typical application circuit figure 2. typical application circuit
APM8601 dual channel single cell linear lithium battery charger with 28v ovp and programmable charge timer APM8601 document number: ds35138 rev. 1 - 2 2 of 14 www.diodes.com december 2010 ? diodes incorporated new product pin descriptions name pin # description bat 1, 7 connection to the battery the battery is charged via this pin and the bat voltage is constantly monitored. connect a bypass capacitor between bat and gnd (2.2f). seti 2 charge current programming the maximum charge current is programmed using a resistor from seti to gnd. this also determines the prequal current charging level and top-off threshold. thm 3 thermistor input to monitor the battery temperature, connect a 10k ? ntc thermistor. place this thermistor as close as possible to the battery. connect thm to gnd if temperature measurement is not required. gnd 4 ground ground connection. ct 5 charge timing connecting a capacitor from ct to gnd will set the time-outs for prequal, top-off and fast-charge. connecting ct direct to gnd disables these timers. usel 6 usb charge select logic input to program the charge current in usb charging mode. i bat = 90ma when usel = low, and i bat = 475ma when usel = high. en 8 enable (active-low) the charger is enabled when this input is low. to start the charger connect en to gnd. drive this input high to disable the charger. usb 9 usb input usb supply input. connect a bypass capacitor (1f) from usb to gnd. pok 10 power ok (active-low) when a valid input source is connected, this open-drain output is pulled low. chg 11 charge status (active-low) open-drain output that indicate s the charging status. it is active only in the fast- charge state and goes high-impedance when the charger is either disabled or in prequal or top-off mode. dc 12, 13 dc input dc supply input. the recommended input voltage is between 4.32v and 7v. this input is capable of withstanding up to 28v. connect both dc pins together on the pcb. it is recommended to connect a bypas s capacitor (1f) from dc to gnd. flt 14 fault flag (active-low) if the prequal or fast-charge timers expire and the charging threshold voltage is not reached, flt (open-drain output) will go low. remove the fault by cycling power or raise en . ep exposed pad for optimal thermal performance connect to copper on pcb (electrically this can be gnd).
APM8601 dual channel single cell linear lithium battery charger with 28v ovp and programmable charge timer APM8601 document number: ds35138 rev. 1 - 2 3 of 14 www.diodes.com december 2010 ? diodes incorporated new product functional block diagram
APM8601 dual channel single cell linear lithium battery charger with 28v ovp and programmable charge timer APM8601 document number: ds35138 rev. 1 - 2 4 of 14 www.diodes.com december 2010 ? diodes incorporated new product absolute maximum ratings symbol parameter rating unit dc, usb to gnd -0.3 to 28v v bat, ct, seti, usel, thm, flt , chg , pok , en to gnd -0.3 to 6v v esd susceptibility (note 2) hbm human body model 2 kv mm machine model 200 v note: 2. semiconductor devices are esd sensitive and may be dam aged by exposure to esd events. suitable esd precautions should be taken when handling and transporting this device. thermal resistance (note 3) symbol parameter rating unit ja junction to ambient 40 c/w note: 3. test condition for dfn3030-10: devi ce mounted on fr-4 2-layer board, 2oz copper, with minimum recommended pad on top l ayer and 6 vias to bottom layer 1.0?x1.5? ground plane. recommended operating conditions (note 4) symbol parameter rating unit ambient temperature range -40 to +85 c input supply voltage 4.15 to 7.00 v i charge typical charge current 0.1 to 1.0 a note: 4. the device function is not guaranteed outside of the recommended operating conditions.
APM8601 dual channel single cell linear lithium battery charger with 28v ovp and programmable charge timer APM8601 document number: ds35138 rev. 1 - 2 5 of 14 www.diodes.com december 2010 ? diodes incorporated new product electrical characteristics APM8601 is tested at v dc = v usb = 5v, v bat = 4v, v en = 0v, r seti = 2k ? , c ct = 68nf, at an ambient temperature of +25c unless otherwise noted. note: 5. guaranteed by testing of undervoltage- and overvoltage-th reshold. to completely charge a battery cell, the input volta ge must be greater than 4.32v. symbol parameter test conditions min typ. max unit v dc /v usb input voltage range 0 28 v v dc /v usb input operating range (not e 5) 4.15 7.00 v uvlo input undervoltage lock out (note 5) input rising, 500mv hysteresis (typ.) v bat = 3.2v 3.85 4.0 4.15 v ovlo input overvoltage lock out input rising, 200mv hysteresis (typ.) 7.2 7.5 7.8 v i dc/usb input supply current i bat = 0ma, r thm = 10k ? 750 1200 a i shtdwn shutdown current en = high, t a = 25oc 275 435 a r ds_on input to bat on-resistance input = 3.7v, v bat = 3.6v 0.5 0.8 ? v dropout input to bat dropout voltage input falling, 200mv hysteresis (typ.) 5 55 150 mv v bat_reg battery voltage regulation i bat = 0ma, t a = 25oc 4.179 4.2 4.221 v bat rstth battery fast-charge restart threshold from bat regulation voltage -230 -175 -110 mv i dc_chg dc charge current v usb = 0v r seti = 1.5k ? 950 1000 1140 ma r seti = 2.0k ? 727 750 870 r seti = 5.0k ? 280 300 353 prequal, r seti = 2k ? , v bat = 2.5v 60 75 95 i usb_chg usb charge current v dc = 0v v usel = 5v 450 475 500 ma v usel = 0v 75 90 105 prequal, r seti = 2k ? , v bat = 2.5v 60 75 95 ss soft-start time ramp time to fast-charge 1.2 ms v preq_th bat prequel threshold v bat rising, 180mv hysteresis (typ.) 2.9 3.0 3.1 v i leak bat leakage current v dc = v usb = 0v, v bat = 4.2v 0.001 5 a r seti resistance range for seti guaranteed by charging current 1.5 5.0 k ?
APM8601 dual channel single cell linear lithium battery charger with 28v ovp and programmable charge timer APM8601 document number: ds35138 rev. 1 - 2 6 of 14 www.diodes.com december 2010 ? diodes incorporated new product electrical characteristics (continued) APM8601 is tested at v dc = v usb = 5v, v bat = 4v, v en = 0v, r seti = 2k ? , c ct = 68nf, at an ambient temperature of +25c unless otherwise noted. symbol parameter test conditions min typ. max unit en , usel logic input thresholds rising 1.6 v falling 0.4 logic input leakage current en v = v usel = 0 to 5.5v, t a = 25oc 0.001 1 a pok , chg , flt logic output voltage, low 1maiii flt chg pok === 12 100 mv logic output leakage current, high 5.5vvvv flt chg pok === v dc = v usb = 0v t a = +25c 0.001 1 a i topoff chg / top-off threshold i bat falling, battery is charged r seti = 1.5k ? 75 ma r seti = 2.0k ? 37.5 56.25 75 r seti = 5.0k ? 22.5 r thm_pullup internal pullup resistance 10 k ? r thm thm resistance, hot r thm falling, 420 ? hyst. (typ.) 3.72 3.94 4.13 k ? thm resistance, cold r thm rising, 2.7k ? hyst. (typ.) 26.7 28.3 29.7 k ? thm resistance, disabled r thm falling, 230 ? hyst. (typ.) 260 315 370 ? ct accu charge timer accuracy c ct = 68nf -20 +20 % tl prequal prequal time limit from entering prequal to flt going low, v bat < 3v 34.8 min tl chg charge time limit from entering fast-charge to flt going low, 3v < v bat < 4.2v 334 min tl top_off top-off time limit from chg going high to charger disabled 34.8 min thfb temp thermal foldback threshold temperature junction temperature beyond which the charge current is reduced, t j rising +100 oc thfb gain thermal foldback gain reduction of i bat for increase in t j (using v dc ), r seti = 1.5k ? 5 %/oc
APM8601 dual channel single cell linear lithium battery charger with 28v ovp and programmable charge timer APM8601 document number: ds35138 rev. 1 - 2 7 of 14 www.diodes.com december 2010 ? diodes incorporated new product functional description APM8601 is a linear li-ion battery charger device for single- cell applications. it has dual power inputs (dc and usb) and the charge currents can be programmed with the r seti resistor and/or the usel pin. the device also incorporates several safety features, such as charge timers, battery temper ature monitoring and internal thermal limiting. functional state diagram any state en = high or v in < v bat or v in < 4.0v or v in > 7.5v en = low a nd v in > v bat a nd v in > 4.0v a nd v in < 7.5v v bat > 3v reset timer v bat < 2.82v reset timer i bat < 112.5 / r seti reset timer i bat > 172.5 / r seti reset timer r thm < 315 ? or (r thm > 3.94k ? a nd r thm < 28.3k ? ) (r thm > 315 ? a nd r thm < 3.94k ? ) or r thm > 28.3k ? r thm < 315 ? or (r thm > 3.94k ? a nd r thm < 28.3k ? ) (r thm > 315 ? a nd r thm < 3.94k ? ) or r thm > 28.3k ? time out v bat < 4.05v reset timer i bat > 112.5 / r seti a nd time out v bat < 3v a nd time out dis a ble pok 1 flt 1 chg 1 i bat 0a prequal pok 0 flt 1 chg 1 i bat 150 / r seti timer hold thm pok 0 flt 1 chg 1 i bat 0a top-off pok 0 flt 1 chg 1 charge pok 0 flt 1 chg 0 i bat (usb) usel setting i bat (dc) 1500 / r seti done pok 0 flt 1 chg 1 i bat 0a timer hold thm pok 0 flt 1 chg 0 i bat 0a fault pok 0 flt 0 chg 1 i bat 0a
APM8601 dual channel single cell linear lithium battery charger with 28v ovp and programmable charge timer APM8601 document number: ds35138 rev. 1 - 2 8 of 14 www.diodes.com december 2010 ? diodes incorporated new product functional description (continued) inputs dc pins 12 and 13 are the dc input. this input will allow charging from input voltages between 4.15v and 7v, and can withstand up to 28v without device damage although charging is disabled above 7.5v (typ.). usb pin 9 is the usb power input. this input will charge with input voltages from 4.15v to 7v. the charging current drawn from usb is selected using the usel pin, either at 95ma (1 usb power allocation unit) or 475ma (5 usb power allocation units, high power). note that r seti has no effect on usb charging cu rrents in the char ge state, but r seti does affect the prequal current when charging fr om usb. this pin will also withstand up to 28v, but charging is disabled above 7.5v (typ.). if both dc and usb are connected and valid, power will be drawn from dc with charge current set by r seti . usb and usel will be ignored. gnd system ground connection. en pin 8 is the enable pin of the device. when pulled low the device will operate normally. when high, the device will remain in the disabled state. for auto-st arting, connect pin 8 directly to gnd. seti pin 2 allows the charge currents to be programmed. icharge 1500 rseti = the charge current setting also changes the currents in prequal and top-off modes ( being 10% and 7.5% of i charge respectively): rseti 150 iprequal = rseti 112.5 itopoff = this pin can also be used to monitor the battery charging current: rseti 1000 vseti icharge = thm the thermistor connection is on pin 3. this allows t he battery temperature to be monitored using a 10k ntc thermistor, which should be placed as close as possible to the battery cell. if no thermistor is used then this input should be connected directly to ground. the charge r will operate when there is less than 315 ? on this input (i.e., no thermistor connected); will be disabled when there is between 315 ? and 3.94k ? ; enabled when between 3.94k ? and 28.3k ? ; and disabled above 28.3k ? . 0c 25 c 50c hot ? trip cold ? trip 3000 25.1 10 4.6 55.1 \ 3.2 3250 27.1 10 4.3 52.6 \ 1.3 3500 29.3 10 4 50.5 0.5 3750 31.7 10 3.8 48.6 2.0 resistance ? in ? k ? at typical ? in ? c thermistor beta disabled enabled enabled disabled 0 315? 3.94k 28.3k r thm
APM8601 dual channel single cell linear lithium battery charger with 28v ovp and programmable charge timer APM8601 document number: ds35138 rev. 1 - 2 9 of 14 www.diodes.com december 2010 ? diodes incorporated new product functional description (continued) usel pin 6 allows the selection of the usb charging current. when low, i bat is limited to 95ma (one usb power allocation unit) and when high i bat is limited to 475ma (5 usb power allocation units, high power), when drawing power from the usb input. this pin does not affect the device operation when power is being drawn from dc. ct the charge timer input on pin 5 allows selection of how long the system timers for prequal, charge and top-off states last. they are set by se lecting the value of capacitor, c ct : ? ? ? ? ? ? = nf68 cct min334 tcharge ? ? ? ? ? ? = = nf68 cct min34.8 ttopoff tprequal the charge timer will hold its current value if the charging was stopped via the thermistor and continue when the battery is in a valid temperature range for charging. outputs bat pins 1 and 7 are the current-controlled charging outputs for the battery cell. they should be connected together and to the positive terminal of the battery. the chip monitors the voltage on these pins. there should be a 2.2f capacitor connected from bat to gnd. pok the pok flag on pin 10 is pulled low when a valid power input is available on either dc or usb inputs. it will go high when no valid power is available and the device will enter the disable state. chg the chg flag at pin 11 is pulled low when the device is in the charge state. it will be high in prequal and top-off states. if the thermistor trips the circuit into the thm state (from prequal or charge states), chg will hold its previous value. flt the flt flag on pin 14 indicates a battery fault, as determined by a time-out in either the prequal or charge states. if the battery voltage does not reach 3v after the prequal time r (default 34.8mins), or does not reduce charging current to 7.5% after the charge timer (default 334mins), this indicates t hat the battery has failed or is failing and this will trigger t he flt flag. this flag will not automatically reset, and can only be cleared by cycling the power input or the en pin.
APM8601 dual channel single cell linear lithium battery charger with 28v ovp and programmable charge timer APM8601 document number: ds35138 rev. 1 - 2 10 of 14 www.diodes.com december 2010 ? diodes incorporated new product functional description (continued) charging process description the charging process is as follows, working through the state diagram. the device will begin in the disable state as the input power supply ramps from 0v. once the input power supply has got into the valid range (4.15v ? 7v), and the device is enabled then it will enter the prequal state. this state allows for slow charging of a severely discharged battery. if the battery is already partially charged then the condition to move into the charge state is met. if it is not then the slow charge will increase the battery voltage until it can enter the charge state, or if the voltage does not rise sufficiently before the charge timer runs out (set using the capacitor on the ct pin) then the device will go into the fault state, indicating that the battery cell may be damaged or has failed and is not taking charge. in the prequal state the battery temperature can be monitored with a 10k ntc thermistor connected to the thm pin, and if the battery temperature goes out of range (above ~50c or below ~0c, depending on thermistor choice) then charging will be suspended with the device going into the thm state. once the battery has charged to a level of 3v, the device enters the charge state, allowing faster charging of the battery in its normal voltage range, with 10 times the current used in the prequal state. for information on setting the charge currents, see the functional description of the seti pin. again, the ba ttery temperature is monitored and charging will be suspended if the temperature goes out of range. the charge state will last until the current drawn by the battery drops to 7.5% of the full charge current. the device will then enter the top-off state, maintaining battery voltage and providing top-off charging current for the time defined by the c t value. once that timer completes, the device will enter the done state, with zero battery current. if the battery voltage falls below 4.05v then the device will automatically return to the charge state. done top-off charge prequal disable en chg v bat i bat t 0v i prequal 150/r seti 0a i charge 1500/r seti 3v 4.2v i topoff 112.5/r seti
APM8601 dual channel single cell linear lithium battery charger with 28v ovp and programmable charge timer APM8601 document number: ds35138 rev. 1 - 2 11 of 14 www.diodes.com december 2010 ? diodes incorporated new product ordering information APM8601 fb - 7 package packing fb :u-dfn3030-14 7 : tape & reel device package code packaging (note 6) 7? tape and reel quantity part number suffix APM8601fb-7 fb u-dfn3030-14 3000/tape & reel -7 note: 6. pad layout as shown on diodes inc. suggested pad la yout document ap02001, which can be found on our website at http://www.diodes .com/datasheets/ap02001.pdf. marking information y : year : 0~9 w : week : a~z : 1~26 week; ( top view ) x : a~z : internal code y w x xx xx : p4 : APM8601 z : represents 52 and 53 a~z : 27~52 week; part number package identification code APM8601fb-7 u-dfn3030-14 p4
APM8601 dual channel single cell linear lithium battery charger with 28v ovp and programmable charge timer APM8601 document number: ds35138 rev. 1 - 2 12 of 14 www.diodes.com december 2010 ? diodes incorporated new product package outline dimensions (all dimensions in mm) u-dfn3030-14 bottom view side view 0.10 c 0.08 c seating plane c 2.95/3.05 2.2/2.4 2.95/3.05 1.6/1.8 (pin #1 id) a b 0.10 c ab 0.25 a 2x- 0.25 b 2x- top mark land pattern recommendation (unit:mm) 14x-0.25 1.80 2.40 0.30/0.40 c 0 . 3 0.15 0/0.05 0.57/0.63 0.40typ top view 0.15/0.25 0.40typ. c l c l c l c l (pin #1 id) 2.65 14x-0.50
APM8601 dual channel single cell linear lithium battery charger with 28v ovp and programmable charge timer APM8601 document number: ds35138 rev. 1 - 2 13 of 14 www.diodes.com december 2010 ? diodes incorporated new product taping orientation (note 7) note: 7. the taping orientation of the other package type can be found on our website at http ://www.diodes.com /datasheets/ap020 07.pdf
APM8601 dual channel single cell linear lithium battery charger with 28v ovp and programmable charge timer APM8601 document number: ds35138 rev. 1 - 2 14 of 14 www.diodes.com december 2010 ? diodes incorporated new product important notice diodes incorporated makes no warranty of any kind, express or implied, with regards to this document, including, but not limited to, the implied warranties of merchantability and fitness for a particular purpose (and their equivalents under the laws of any jurisdiction). diodes incorporated and its subsidiaries rese rve the right to make modifications, enhanc ements, improvements, corrections or ot her changes without further notice to this document and any product described herein. diodes incorporated does not assume any liabi lity arising out of the application or use of this document or an y product described herein; neither does diodes incorporated convey any license under its patent or trademark rights, nor the rights of othe rs. any customer or user of this document or products desc ribed herein in such applications shall assume all risks of such use and will agree to hold diodes incorporated and all the companies whose products are represented on diodes incorp orated website, harmless against all damages. diodes incorporated does not warrant or accept any liability what soever in respect of any prod ucts purchased through unauthoriz ed sales channel. should customers purchase or use diodes in corporated products for any unintended or unauthorized application, customers shall indemnify and hold diodes incorporated and its representatives har mless against all claims, damages, expenses, and attorney fee s arising out of, directly or indirectly, any claim of personal injury or death a ssociated with such unintended or unauthorized a pplication. products described herein may be covered by one or more united states, international or foreign patents pending. product names and markings noted herein may also be covered by one or more united states, international or foreign trademarks. life support diodes incorporated products are specifica lly not authorized for use as critical co mponents in life support devices or systems without the express written approval of the chief executive officer of diodes incorporated. as used herein: a. life support devices or systems are devices or systems which: 1. are intended to implant into the body, or 2. support or sustain life and whose failure to perform when pr operly used in accordance with instructions for use provided in the labeling can be reasonably expected to re sult in significant injury to the user. b. a critical component is any component in a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or to affect its safety or effectiveness. customers represent that they have all necessary expertise in t he safety and regulatory ramifications of their life support dev ices or systems, and acknowledge and agree that they are solely responsi ble for all legal, regulatory and safety-related requirements concerning their products and any use of diode s incorporated products in such safety-cri tical, life support devices or systems, notwithstanding any devices- or systems-related information or support that may be provided by diodes incorporated. further, customers must fully indemnify diodes incorporated and its repr esentatives against any damages ar ising out of the use of diodes incorporated products in such safety-c ritical, life support devices or systems. copyright ? 2010, diodes incorporated www.diodes.com

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