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general description the max8804v/max8804w/max8804y/max8804z intelligent, dual-input, stand-alone, constant-current, constant-voltage (cccv), thermally regulated linear chargers are designed for a single-cell lithium-ion (li+) battery. they integrate the current-sense circuit, mos pass element, thermal-regulation circuitry, and overvolt- age protection (ovp), and eliminate the reverse-block- ing schottky diode. the max8804v/max8804w/max8804z function as stand-alone chargers to control the charging sequence from the prequalification state through fast-charge, top- off charge, and full-charge indication. the max8804y eliminates the prequalification state to allow startup into a load without a battery. proprietary thermal-regulation cir- cuitry limits the die temperature when fast-charging or while exposed to high ambient temperatures, allowing maximum charging current without damaging the ic. the max8804v/max8804w/max8804y/max8804z achieve high flexibility by providing an adjustable dc/usb fast-charge current through a simple single-wire interface (set input). the chargers automatically select between either a usb or ac adapter input source. the ac adapter charge current is programmable from 400ma to 700ma in 50ma steps through a serial interface. the usb charge current is programmable to 95ma, 380ma, or 475ma through the same interface. other features include an active-low battery charging-status indicator ( chg), an active-low power-ok indicator ( pok), an active-low usb input detection output (usbpwr) on the max8804y/ max8804z, and battery pack detection (detbat) on the max8804v/max8804w. the max8804v has 120ma, 140ma, 180ma, and 200ma chg top-off threshold settings, while the max8804w/max8804y/max8804z have 70ma, 80ma, 90ma, and 100ma. the max8804v/max8804w/max8804y/max8804z accept a 4.15v to 30v dc source voltage or a 4.15v to 16v usb input voltage, but disable charging when either input voltage exceeds 7.5v to protect against unqualified or faulty input sources. the max8804v/ max8804w/max8804y/max8804z operate over the extended temperature range (-40? to +85?) and are available in a tiny 8-pin thermally enhanced 2mm x 3mm tdfn package. applications features ? complete chargers for single-cell li+ battery ? dual-input, 30v ac adapter/16v usb ? no external fet, blocking diode, or sense resistor required ? automatic usb/ac adapter input selection ? easy programmable fast-charge current and top-off threshold ? proprietary die temperature regulation control ? 5% fast-charge current-limit accuracy ? battery pack detection input (max8804v/max8804w) ? power-present and charger-status outputs ? no prequalification charge (max8804y) ? tiny 2mm x 3mm thermally enhanced tdfn package max8804v/max8804w/max8804y/max8804z high-voltage, dual-input, usb/ac adapter chargers in 2mm x 3mm tdfn ________________________________________________________________ maxim integrated products 1 19-0785; rev 2; 4/08 for pricing, delivery, and ordering information, please contact maxim direct at 1-888-629-4642, or visit maxim's website at www.maxim-ic.com. evaluation kit available ordering information * ep = exposed paddle. + denotes a lead-free package. note: all devices are specified to operate over the -40? to +85? operating temperature range. part pin- package top mark max8804v eta+ 8 tdfn-ep* aaq max8804w eta+ 8 tdfn-ep* aap max8804y eta+ 8 tdfn-ep* aad max8804z eta+ 8 tdfn-ep* aac pin configuration appears at end of data sheet. dc gnd usb set chg pok bat +3.3v ac adapter usb port enable/disable and programming li+ 1f 2.2f max8804v max8804w max8804y max8804z 1f (detbat) note: () for max8804v/max8804w, < > for max8804y/max8804z typical application circuit cell phones/smartphones digital cameras portable media players mp3 players other handheld devices
max8804v/max8804w/max8804y/max8804z high-voltage, dual-input, usb/ac adapter chargers in 2mm x 3mm tdfn 2 _______________________________________________________________________________________ absolute maximum ratings electrical characteristics ((v dc = 5v, v set = 0v) or (v usb = 5v, v set = 5v), v bat = unconnected, v detbat = 0v (max8804v/max8804w), t a = -40? to +85?, unless otherwise noted.) (note 1) stresses beyond those listed under ?bsolute maximum ratings?may cause permanent damage to the device. these are stress rating s only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specificatio ns is not implied. exposure to absolute maximum rating conditions for extended periods may affect device reliability. dc to gnd .............................................................-0.3v to +30v usb to gnd ...........................................................-0.3v to +16v bat, chg , set, pok , usbpwr , detbat to gnd...............................................................-0.3v to +5.5v continuous power dissipation (t a = +70?) 8-pin tdfn 2mm x 3mm (derate 16.7mw/? above +70?) (multilayer board) .......................................................1333mw operating temperature range ...........................-40? to +85? junction temperature ......................................................+150? storage temperature range .............................-65? to +150? lead temperature (soldering, 10s) .................................+300? parameter conditions min typ max units dc and usb dc input voltage range 028v usb input voltage range 014v input operating range (notes 2, 3) 4.15 7.00 v input undervoltage threshold v in rising, 500mv hysteresis (typ) (note 2) 3.85 4.0 4.15 v input overvoltage threshold v in rising, 200mv hysteresis (typ) (note 2) 7.2 7.5 7.8 v v usb = 0v, i bat = 0ma, charge mode 800 1200 v set = 5v, standby mode 300 550 dc input supply current v dc = v bat = 4.3v, shutdown mode 300 550 ? v dc = 0v, v set = 5v, i bat = 0ma, charge mode 800 1200 v set = 0v, standby mode 300 550 usb input supply current v usb = v bat = 4.3v, shutdown mode 300 550 ? dc to bat on-resistance v dc = 3.7v, v bat = 3.6v 0.55 1.0 usb to bat on-resistance v usb = 3.7v, v bat = 3.6v 0.65 1.2 v in rising 145 260 385 input to bat comparator threshold (note 2) v in falling 55 mv bat t a = +25? 4.179 4.200 4.221 bat regulation voltage i bat = 0ma t a = -40? to +85? 4.158 4.200 4.242 v v bat rising 4.40 4.67 4.90 battery removal detection threshold hysteresis 0.1 v default and 1st to 3rd interface pulse 475 500 525 4th to 7th interface pulse 523 550 578 8th to 11th interface pulse 570 600 630 12th to 15th interface pulse 428 450 473 16th to 19th interface pulse 380 400 420 20th to 23rd interface pulse 618 650 683 dc charging current v usb = 0v, v bat = 3.6v, rising edge detection on set (max8804y/ max8804z) 24th to 27th interface pulse 665 700 735 ma
max8804v/max8804w/max8804y/max8804z high-voltage, dual-input, usb/ac adapter chargers in 2mm x 3mm tdfn _______________________________________________________________________________________ 3 parameter conditions min typ max units default and 1st to 3rd interface pulse 428 450 473 4th to 7th interface pulse 523 550 578 8th to 11th interface pulse 475 500 525 12th to 15th interface pulse 380 400 420 16th to 19th interface pulse 570 600 630 20th to 23th interface pulse 618 650 683 dc charging current v usb = 0v, v bat = 3.6v, rising edge detection on set (max8804v/ max8804w) 24th to 27th interface pulse 665 700 735 ma default 90 95 100 1st interface pulse 360 380 400 v dc = 0v, v bat = 3.6v, rising edge detection on set (max8804y/ max8804z) 2nd interface pulse 450 475 500 default 360 380 400 1st interface pulse 450 475 500 usb charging current v dc = 0v, v bat = 3.6v, rising edge detection on set (max8804v/ max8804w) 2nd interface pulse 90 95 100 ma soft-start time ramping time from 0 to 500ma 250 ? bat prequal threshold max8804v/max8804w/max8804z only, v bat rising, 300mv hysteresis (typ) 2.35 2.50 2.65 v bat prequal charge current max8804v/max8804w/max8804z only 95 ma bat leakage current v dc = v usb = 0v, v bat = 4.2v 2 a set v set rising 1.6 logic input thresholds v set falling 0.4 v logic-high time pulse width required to program dc charge current 1 1000 ? logic-low time pulse width required to program usb charge current 1 1000 ? set dc mode shutdown delay v usb = 0v, v dc = 5v, measured from v set low to high 1.5 2 2.5 ms set usb mode shutdown delay v dc = 0v, v usb = 5v, measured from v set high to low 1.5 2 2.5 ms set internal pulldown resistor 24m pok , chg , usbpwr (usbpwr only for max8804y/max8804z) logic output-voltage low i pok = i chg = i usbpwr = 5ma 60 500 mv t a = +25? 0.001 1 logic output-current high v pok = v chg = v usbpwr = 5.5v, v dc = v usb = 0v t a = +85? 0.01 ? detbat (max8804v/max8804w only) rising 1.6 logic input theshold falling 0.4 v pullup resistor 63 k electrical characteristics (continued) ((v dc = 5v, v set = 0v) or (v usb = 5v, v set = 5v), v bat = unconnected, v detbat = 0v (max8804v/max8804w), t a = -40? to +85?, unless otherwise noted.) (note 1)
max8804v/max8804w/max8804y/max8804z high-voltage, dual-input, usb/ac adapter chargers in 2mm x 3mm tdfn 4 _______________________________________________________________________________________ electrical characteristics (continued) ((v dc = 5v, v set = 0v) or (v usb = 5v, v set = 5v), v bat = unconnected, v detbat = 0v (max8804v/max8804w), t a = -40? to +85?, unless otherwise noted.) (note 1) parameter conditions min typ max units chg v dc = 0v, v usb = 5v 60 80 100 default, 4th, 8th, 12th, 16th, 20th, 24th, 28th interface pulse 60 80 100 1st, 5th, 9th, 13th, 17th, 21st, 25th interface pulse 67.5 90 112.5 2nd, 6th, 10th, 14th, 18th, 22nd, 26th interface pulse 75 100 125 chg top-off threshold (max8804w/max8804y/ max8804z) i bat falling, battery is charged, rising edge on set v dc = 5v, v usb = 0v 3rd, 7th, 11th, 15th, 19th, 23rd, 27th interface pulse 52.7 70 87.5 ma v dc = 0v, v usb = 5v 60 80 100 default, 4th, 8th, 12th, 16th, 20th, 24th, 28th interface pulse 90 120 150 1st, 5th, 9th, 13th, 17th, 21st, 25th interface pulse 105 140 175 2nd, 6th, 10th, 14th, 18th, 22nd, 26th interface pulse 135 180 225 chg top-off threshold (max8804v) i bat falling, battery is charged, rising edge on set v dc = 5v, v usb = 0v 3rd, 7th, 11th, 15th, 19th, 23rd, 27th interface pulse 150 200 250 ma dc mode 57 chg hysteresis i bat rising after top-off is detected (note 4) usb mode 51 ma chg detection delay i bat falls below top-off threshold 3 4 5 ms thermal loop thermal-regulation set point junction temperature when the charge current is reduced, t j rising +105 c dc charging -40 thermal-regulation gain reduction of i bat for increase of t j usb charging -24 ma/ c note 1: devices are 100% production tested at t a = +25?. limits over the operating temperature range are guaranteed by design and characterization. note 2: v in refers to the input for the ic. for the max8804v/max8804w/max8804y/max8804z, v in is v dc with v usb = 0v or v usb with v dc = 0v. note 3: guaranteed by undervoltage and overvoltage threshold testing. for charge completion, the input voltage must be greater than 4.28v. note 4: this hysteresis is for all charge current except 95ma. in the case of 95ma charge current, voltage-mode to current-mode detection gives indication of charge mode.
max8804v/max8804w/max8804y/max8804z high-voltage, dual-input, usb/ac adapter chargers in 2mm x 3mm tdfn _______________________________________________________________________________________ 5 supply current vs. input voltage (dc charging mode) input voltage (v) supply current (ma) max8804y/z toc01 036912151821242730 0 0.2 0.4 0.6 0.8 1.0 supply current vs. input voltage (usb charging mode) input voltage (v) supply current (ma) max8804y/z toc02 0246810121416 0 0.2 0.4 0.6 0.8 1.0 disabled-mode supply current vs. input voltage (dc charging mode) input voltage (v) supply current (ma) max8804y/z toc03 0 5 10 15 20 25 30 0 0.2 0.4 0.6 0.8 typical operating characteristics (v bat = 3.6v; dc charge mode: v dc = 5v, v usb = 0v, v detbat = 0v (max8804y/max8804z only), v set = 0v or unconnected; usb charge mode: v usb = 5v, v dc = 0v, v set = 5v; t a = +25?, unless otherwise noted.) standby-mode supply current vs. input voltage (usb charging mode) input voltage (v) supply current (ma) max8804y/z toc04 0246810121416 0 0.2 0.4 0.6 0.8 charge current vs. battery voltage (dc charging mode) battery voltage (v) charge current (ma) max8804y/z toc05 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 0 100 200 300 400 500 600 charge current vs. battery voltage (usb charging mode) battery voltage (v) charge current (ma) max8804y/z toc06 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 0 40 80 120 160 200
charge current vs. ambient temperature ambient temperature ( c) charge current (ma) max8804y/z toc13 -40 -15 10 35 60 85 200 300 400 500 600 700 dc charge mode 650ma battery regulation voltage vs. load current load current (ma) battery regulation voltage (v) max8804y/z toc14 0 100 200 300 400 500 600 700 4.10 4.15 4.20 4.25 4.30 550ma charge-current setting battery regulation voltage vs. ambient temperature ambient temperature ( c) battery regulation voltage (v) max8804y/z toc12 -40 -15 10 35 60 85 4.180 4.186 4.192 4.198 4.204 4.210 usb mode dc mode max8804v/max8804w/max8804y/max8804z high-voltage, dual-input, usb/ac adapter chargers in 2mm x 3mm tdfn 6 _______________________________________________________________________________________ charge current vs. dc input voltage input voltage (v) charge current (ma) max8804y/z toc07 0 5 10 15 20 25 30 0 100 200 300 400 500 600 charge current vs. usb input voltage input voltage (v) charge current (ma) max8804y/z toc08 0246810121416 0 30 60 90 120 max8804y/z toc09 charge current vs. set pulse (usb charging mode) (max8804y/max8804z) 475ma 95ma 95ma 95ma 475ma 380ma 380ma 475ma 2ms/div 1v/div v set i chg 200ma/div max8804y/z toc10 charge current vs. set pulse (dc charging mode) (max8804y/max8804z) 700ma 500ma 450ma 400ma 650ma 700ma 500ma 550ma 600ma 2ms/div 1v/div 200ma/div v set i chg charge current vs. input voltage headroom input voltage headroom (mv) charge current (ma) max8804y/z toc11 0 100 200 300 400 500 0 100 200 300 400 500 600 dc mode usb mode input voltage decreasing typical operating characteristics (continued) (v bat = 3.6v; dc charge mode: v dc = 5v, v usb = 0v, v detbat = 0v (max8804y/max8804z only), v set = 0v or unconnected; usb charge mode: v usb = 5v, v dc = 0v, v set = 5v; t a = +25?, unless otherwise noted.)
max8804v/max8804w/max8804y/max8804z high-voltage, dual-input, usb/ac adapter chargers in 2mm x 3mm tdfn _______________________________________________________________________________________ 7 pin description pin max8804v/ max8804w max8804y/ max8804z name function 1 1 bat battery connection. the ic delivers charging current and monitors battery voltage using bat. bypass bat to gnd with a 2.2? or larger ceramic capacitor. bat is high impedance when the ic is disabled. 2 detbat battery pack detection input. drive detbat low or connect it to gnd to allow set to control the charger. leave detbat unconnected to disable any charge mode. ? usbpwr usb input detection output. usbpwr is internally pulled low if a valid voltage is present at usb, otherwise it is high impedance. usbpwr circuitry is active regardless of set and charger on/off status. 33 pok power-ok monitor. pok is an open-drain output that is internally pulled low when a valid charging source is detected at either dc or usb. pok is high impedance when both input voltages are less than v uvlo or v bat . 44dc dc input supply. connect dc to a 4.15v to 7v charging source. bypass dc to gnd with a 1? or larger ceramic capacitor. dc takes priority over usb when both are valid. 5 5 usb usb input source. connect usb to a usb port. bypass usb to gnd with a 1? or larger ceramic capacitor. 66 chg charging-status output. chg is internally pulled low when the battery is being charged. chg is high impedance when the charger is in top-off mode or disabled. 7 7 set enable/disable, charging current, and top-off threshold set input. drive set low to enable dc charge mode and drive high to enable usb charge mode. if both dc and usb inputs are present, set is used for the dc charge mode only and usb charge is disabled. set is also used for programming the charge current and top-off threshold. see the dc/usb mode and charging current setting section for details. 8 8 gnd ground ep exposed paddle. connect to the gnd plane for optimum thermal dissipation.
max8804v/max8804w/max8804y/max8804z high-voltage, dual-input, usb/ac adapter chargers in 2mm x 3mm tdfn 8 _______________________________________________________________________________________ detailed description the max8804v/max8804w/max8804y/max8804z dual- input linear battery chargers use voltage, current, and thermal-control loops to charge and protect a single li+ battery. when a li+ battery with a cell voltage below 2.5v is inserted, the max8804v/max8804w/max8804z chargers enter the prequalification stage where they precharge that cell with 95ma (figure 2). the chg indi- cator output is driven low to indicate entry into the pre- qualification state. when battery voltage exceeds 2.5v, the charger soft-starts as it enters the fast-charge stage. the max8804y eliminates the prequalification state and enters fast-charge when the battery is inserted. the fast- charge current level is programmed by a simple single- wire interface. as the battery voltage approaches 4.2v, the charging current is reduced. if the battery current drops below the top-off current threshold, the chg indi- cator goes high impedance, signaling that the battery is fully charged. the ics then enter a constant voltage-reg- ulation mode to maintain the battery at full charge. the max8804v/max8804w/max8804y/max8804z auto- matically select between either a usb or ac adapter input source. the ac adapter charge current is pro- grammable from 400ma to 700ma in 50ma steps through a simple single-wire interface (see tables 2, 3, and 4). the usb charge current is programmable to 95ma, 380ma, or 475ma through the same interface (see tables 5 and 6). dc and usb output control logic control dc usb bat set pok chg 4.15v to 30v 4.15v to 16v temp sensor +105 c voltage loop bias circuit ref gnd overvoltage protection li+ max8804v max8804w max8804y max8804z dc pok usb pok (detbat) note: ( ) for max8804v/max8804w only < > for max8804y/max8804z only figure 1. functional diagram
max8804v/max8804w/max8804y/max8804z high-voltage, dual-input, usb/ac adapter chargers in 2mm x 3mm tdfn _______________________________________________________________________________________ 9 dc charging the max8804v/max8804w/max8804y/max8804z are designed to charge a single-cell li+ battery from a dc source voltage between 4.15v and 7v and withstand up to 30v maximum input voltage. the charge current and top-off threshold are programmed with the set input. usb charging the max8804v/max8804w/max8804y/max8804z contain a usb input that allows operation from a usb port with voltages between 4.15v and 7v and can withstand up to 16v maximum input voltage. pulsing set allows programming a 95ma, 380ma, or 475ma maximum charging current when using the usb input. i chg < i top-off i chg > i top-off + 57ma for all fast-charge options except 95ma v uvlo < v in < v ovp and v in > v bat v in < v uvlo or v in > v ovp or v bat > v in or detbat = high max8804v/ max8804w/ max8804z asynchronous from anywhere t set = high > 2ms for dc mode t set = low > 2ms for usb mode t set = low > 2ms for dc mode t set = high > 2ms for usb mode standby mode charger = off pok = low chg = high impedance max8804y t set = low > 2ms for dc mode t set = high > 2ms for usb mode cv mode to cc mode for 95ma fast-charge option asynchronous from anywhere v in < v uvlo or v in > v ovp or v bat > v in or detbat = high v bat < 2.2v max8804v/ max8804w/ max8804z v bat > 2.5v v bat < 2.5v fast-charge 100% charge current pok = low chg = low full bat v bat = 4.2v pok = low chg = high impedance prequalification default charge current pok = low chg = low shutdown charger = off pok = high impedance* chg = high impedance *pok = low when v in > v ovp figure 2. charger state diagram
max8804v/max8804w/max8804y/max8804z high-voltage, dual-input, usb/ac adapter chargers in 2mm x 3mm tdfn 10 ______________________________________________________________________________________ dc/usb mode and charging current setting set is a logic input that sets dc/usb charging mode and charging current. drive set low or leave it uncon- nected to enable dc charging mode. drive set high to enable usb charging mode (see table 1). set can also be driven by series pulses to program the charg- ing current in both dc and usb mode. dc charge mode drive set low or leave it unconnected to enable dc charging mode. subsequent pulses on set program the charging current and the top-off threshold. there are seven fast-charge current options and four top-off threshold options. pulse set high (1? to 1ms pulse width) subsequently to realize charging current and top-off threshold programming and transition. after the 28th pulse, the max8804v/ max8804w/max8804y/ max8804z go into the default mode and start a new cycle. see tables 2, 3, and 4 and figure 3 to set the desired charging current and top-off threshold. drive set high longer than 2ms to disable the dc charging- control circuitry. table 1. set truth table set v dc v usb charger status 0 invalid invalid off 0 invalid valid off 0 valid invalid dc charging mode enabled, usb charging mode disabled 0 valid valid dc charging mode enabled, usb charging mode disabled 1 invalid invalid off 1 invalid valid dc charging mode disabled, usb charging mode enabled 1 valid invalid off 1 valid valid off table 2. max8804y/max8804z dc charging current programming by series pulses pulse number default 1st 2nd 3rd 4th 5th 6th 7th 8th 9th 10th 11th 12th 13th 14th i chg (ma) 500 500 500 500 550 550 550 550 600 600 600 600 450 450 450 top - o ff c ur r ent thr eshol d ( m a) 80 90 100 70 80 90 100 70 80 90 100 70 80 90 100 pulse number 15th 16th 17th 18th 19th 20th 21st 2 2 n d 2 3 r d 24th 25th 26th 27th 28th i chg (ma) 450 400 400 400 400 650 650 650 650 700 700 700 700 500 top - o ff c ur r ent thr eshol d ( m a) 70 80 90 100 70 80 90 100 70 80 90 100 70 80 table 3. max8804w dc charging current programming by series pulses pulse number default 1st 2nd 3rd 4th 5th 6th 7th 8th 9th 10th 11th 12th 13th 14th i chg (ma) 450 450 450 450 550 550 550 550 500 500 500 500 400 400 400 top - o ff c ur r ent thr eshol d ( m a) 80 90 100 70 80 90 100 70 80 90 100 70 80 90 100 pulse number 15th 16th 17th 18th 19th 20th 21st 2 2 n d 2 3 r d 24th 25th 26th 27th 28th i chg (ma) 400 600 600 600 600 650 650 650 650 700 700 700 700 450 top - o ff c ur r ent thr eshol d ( m a) 70 80 90 100 70 80 90 100 70 80 90 100 70 80 note: this table is true when detbat = low for the max8804v/max8804w. when detbat = high, the max8804w enters shutdown.
max8804v/max8804w/max8804y/max8804z high-voltage, dual-input, usb/ac adapter chargers in 2mm x 3mm tdfn ______________________________________________________________________________________ 11 table 4. max8804v dc charging current programming by series pulses pulse number default 1st 2nd 3rd 4th 5th 6th 7th 8th 9th 10th 11th 12th 13th 14th i chg (ma) 450 450 450 450 550 550 550 550 500 500 500 500 400 400 400 top - o ff c ur r ent thr eshol d ( m a) 120 140 180 200 120 140 180 200 120 140 180 200 120 140 180 pulse number 15th 16 th 17th 18th 19th 20th 21st 2 2 n d 2 3 r d 24th 25th 26th 27th 28th i chg (ma) 400 600 600 600 600 650 650 650 650 700 700 700 700 450 top - o ff c ur r ent thr eshol d ( m a) 200 120 140 180 200 120 140 180 200 120 140 180 200 120 dc pok set 1 234 2425262728 80ma 90ma 100ma 70ma 80ma 80ma 90ma 100ma 70ma 80ma 0ma 500ma 550ma 700ma 500ma 0ma i chg top-off current threshold t softstart t high > 2ms 2ms delay (450ma) (550ma) (700ma) (450ma) note: ( ) for max8804v/max8804w < >for max8804v <120ma> <140ma> <180ma> <200ma> <120ma> <120ma> <140ma> <180ma> <200ma> <120ma> figure 3. dc charging current and top-off threshold programming
max8804v/max8804w/max8804y/max8804z high-voltage, dual-input, usb/ac adapter chargers in 2mm x 3mm tdfn 12 ______________________________________________________________________________________ > 2ms 1 2 3 95ma 380ma 475ma 80ma 95ma 95ma usb set 0ma 0ma usbpwr pok i chg top-off current threshold t softstart t low 2ms delay 380ma 475ma 380ma 0ma 0ma i chg max8804v/max8804w max8804y/ max8804z figure 4. usb charging current programming usb charge mode drive set high to enable usb charging mode when the usb input is valid. subsequent low pulses with 1? to 1ms pulse width on set program the fast charging cur- rent from 95ma, 380ma, to 475ma for the max8804y/ max8804z and from 380ma, 475ma, to 95ma for the max8804v/max8804w and then repeat new cycle as shown in tables 5 and 6. drive set low or leave it unconnected longer than 2ms to disable usb charg- ing-control circuitry. table 5. max8804y/max8804z usb charging current programming by series pulses pulse number default 1st 2nd 3rd i chg (ma) 95 380 475 95 top-off current threshold (ma) 80 80 80 80 table 6. max8804v/max8804w usb charging current programming by series pulses pulse number default 1st 2nd 3rd i chg (ma) 380 475 95 380 top-off current threshold (ma) 80 80 80 80
max8804v/max8804w/max8804y/max8804z high-voltage, dual-input, usb/ac adapter chargers in 2mm x 3mm tdfn ______________________________________________________________________________________ 13 soft-start the soft-start circuitry activates when entering fast- charge mode. in the max8804y, soft-start is entered directly after being enabled, and the charging current ramps up in 250? from 0 to 500ma (95ma in usb mode). this reduces the inrush current on the input supply. note that the max8804v/max8804w/ max8804z has a prequalification state and the charg- ing current ramps up when the prequalification state is complete (v bat exceeds 2.5v). thermal regulation control the thermal-regulation loop limits the max8804v/ max8804w/max8804y/max8804z die temperature to +105? by reducing the charge current as necessary. this feature not only protects the ics from overheating, but also allows a higher charge current at room temper- ature without risking damage to the system. charging-status output ( chg ) chg is an open-drain output that indicates charger sta- tus. chg goes low during charge cycles where the max8804v/max8804w/max8804y/max8804z are in prequalification or fast-charge mode. chg goes high impedance when the charge current reaches the top- off threshold for more than 4ms, indicating charging is done. the chg status is latched after the top-off threshold is reached. the latch is reset by toggling the set input, recycling input power, or increasing the charging current to the top-off threshold plus 57ma (typ). when the max8804v/max8804w/max8804y/max8804z are used in conjunction with a microprocessor (?), con- nect a pullup resistor between chg and the logic i/o voltage to indicate charge status to the ?. alternatively, chg can sink up to 5ma for an led charge indicator. power-ok monitor ( pok ) the max8804v/max8804w/max8804y/max8804z con- tain an open-drain pok output that goes low when a valid input source is detected at either dc or usb. a valid input source is one whose voltage is greater than 4.15v and exceeds the battery voltage by 250mv. after a valid input has been established, charging is sustained with inputs as low as 3.5v as long as the input voltage remains above the battery voltage by at least 40mv. pok status is maintained regardless of set status. when the max8804v/max8804w/max8804y/max8804z are used in conjunction with a ?, connect a pullup resis- tor between pok and the logic i/o voltage to indicate power-ok to the ?. alternatively, pok can sink up to 5ma for an led power-ok indicator. usb power status output ( usbpwr ) (max8804y/max8804z only) usbpwr is internally pulled low when v usb > v uvlo and v usb - v bat > 250mv. otherwise, it is high imped- ance. usbpwr indicates the usb input presence regardless of set status and charger status. when the max8804y/max8804z are used in conjunction with a ?, connect a pullup resistor between usbpwr and the logic i/o voltage to indicate usb power status to the ?. alternatively, usbpwr can sink up to 5ma for an led usb power status indicator. battery pack dectection input (detbat, max8804v/max8804w only) detbat is pulled up to an internal 3v supply through a 63k resistor. driving detbat low or connecting it to gnd allows set to control the charger. when detbat is left unconnected, the max8804v/max8804w enters shutdown. applications information capacitor selection connect a 2.2? ceramic capacitor from bat to gnd for proper stability. connect a 1? ceramic capacitor from dc to gnd. if using the usb input, bypass usb to gnd with a 1? ceramic capacitor. use a larger input bypass capacitor for high charging currents to reduce supply noise. all capacitors should be x5r dielectric or better. be aware that some capacitors have large voltage and temperature coefficients and should be avoided. thermal considerations the max8804v/max8804w/max8804y/max8804z are available in a thermally enhanced tdfn package with an exposed paddle. connect the exposed paddle to a large copper ground plane to provide a thermal contact between the device and the pcb for increased power dissipation. the exposed paddle transfers heat away from the device, allowing the ic to charge the battery with maximum current, while minimizing the die temper- ature increase. input sources the max8804v/max8804w/max8804y/max8804z operate from well-regulated input sources. the operat- ing input voltage range is 4.15v to 7v. the device sur- vives dc input supply voltages up to 30v and usb input source voltages up to 16v without damage to the ic. if the input voltage is greater than 7.5v (typ), the ic stops charging. an appropriate power supply must pro- vide at least 4.2v plus the voltage drop across the internal pass transistor when sourcing the desired max- imum charging current:
max8804v/max8804w/max8804y/max8804z high-voltage, dual-input, usb/ac adapter chargers in 2mm x 3mm tdfn 14 ______________________________________________________________________________________ dc chg pok bat usb gnd set usb port p system i/o 2.2 f max8804v max8804w max8804y max8804z ac adapter 1 f 1 f li+ note: ( ) for max8804v/max8804w < > for max8804y/max8804z (detbat) figure 5. microprocessor-interfaced li+ charger with the max8804v/max8804w/max8804y/max8804z v in(min) > 4.2v + i charge(max) x r on where r on is the input-to-bat resistance (typically 0.55 for dc or 0.65 for usb). failure to meet this requirement results in an incomplete charge or increased charge time. application circuits stand-alone li+ charger the max8804v/max8804w/max8804y/max8804z pro- vide a complete li+ charging solution. the typical application circuit shows the max8804v/max8804w/ max8804y/max8804z as a stand-alone li+ battery charger. the led indicates when either fast-charge or prequalification has begun. when the battery is fully charged, the led turns off. microprocessor-interfaced li+ charger figure 5 shows the max8804v/max8804w/max8804y/ max8804z as a ?-interfaced li+ battery charger. the ? drives set to enable/disable dc/usb mode charg- ing. chg can be used to detect the charge status of a battery. layout and bypassing connect the input capacitors as close as possible to the ic. provide a large copper gnd plane to allow the exposed paddle to sink heat away from the ic. connect the battery to bat as close as possible to the ic to pro- vide accurate battery voltage sensing. make all high- current traces short and wide to minimize voltage drops. a sample layout is available in the max8804z evaluation kit to speed designs.
max8804v/max8804w/max8804y/max8804z high-voltage, dual-input, usb/ac adapter chargers in 2mm x 3mm tdfn ______________________________________________________________________________________ 15 chip information process: bicmos 1 + 34 865 gnd chg usb max8804v max8804w max8804y max8804z 2 7 set bat pok dc usbpwr tdfn 2mm 3mm top view (detbat) ( ) for max8804v/max8804w pin configuration package information for the latest package outline information, go to www.maxim-ic.com/packages . package type package code document no. 8 tdfn-ep t823+1 21-0174
max8804v/max8804w/max8804y/max8804z high-voltage, dual-input, usb/ac adapter chargers in 2mm x 3mm tdfn maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a maxim product. no circu it patent licenses are implied. maxim reserves the right to change the circuitry and specifications without notice at any time. 16 ____________________maxim integrated products, 120 san gabriel drive, sunnyvale, ca 94086 408-737-7600 2008 maxim integrated products is a registered trademark of maxim integrated products, inc. heaney revision history revision number revision date description pages changed 0 4/07 initial release. 1 10/07 added max8804w and battery pack detection feature. 1?6 2 4/08 added max8804v and updated dc charge mode section. 1?5

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