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general description the max6775?ax6781 low-power, 1%-accurate bat-tery monitors are available in the ultra-small ?fn package (1.0mm x 1.5mm) and sc70 packages. these low-power devices are ideal for monitoring single lithi- um-ion (li+) cells, or multicell alkaline/nicd/nimh power sources. these devices offer single (max6775/ max6776/max6777/max6778) or dual (max6779/ max6780/max6781) low-battery outputs and feature fixed or resistor-adjustable hysteresis. hysteresis elimi- nates the output chatter sometimes associated with bat- tery voltage monitors, usually due to input-voltage noise or battery terminal voltage recovery after load removal. these devices are available in several versions: with single- or dual-voltage monitors, and with fixed or adjustable hysteresis. the max6775/max6776 offer a single battery monitor and factory-set hysteresis of 0.5%, 5%, or 10%. the max6779/max6780/max6781 have two battery monitors in a single package and fac- tory-set hysteresis of 0.5%, 5%, or 10%. the max6777/ max6778 offer a single battery monitor with external inputs for the rising and falling thresholds, allowing external hysteresis control. for convenient interface with system power circuitry or microprocessors, both open-drain and push-pull out- puts are available. the single-channel devices are available with open-drain or push-pull outputs. the dual-channel devices are available with both outputs open-drain, both outputs push-pull, or one of each (see the selector guide ). this family of devices is offered in small 5-pin sc70 and ultra-small 6-pin ?fnpackages, and is fully specified over the -40? to +85? extended temperature range. applications battery-powered systems (single-cell li+ ormulticell nimh, nicd, alkaline) cell phones/cordless phones pagers portable medical devices pdas electronic toys mp3 players features ? 1.0%-accurate threshold specified overtemperature ? single/dual, low-battery output options ? low 3? battery current ? open-drain or push-pull low-battery outputs ? fixed or adjustable hysteresis ? low-input leakage current allows use of largeresistors ? guaranteed valid low-battery-output logic statedown to v batt = 1v ? immune to short battery transients ? fully specified from -40? to +85? ? small 5-pin sc70 or ultra-small 6-pin ?fn (1mm x 1.5mm) package max6775?ax6781 low-power, 1%-accurate battery monitors in ?fn and sc70 packages ________________________________________________________________ maxim integrated products 1 ordering information lbi 3.6v lbo batt max6775 shdn out dc-dc converter in typical operating circuit 19-3774; rev 4; 5/09 for pricing, delivery, and ordering information, please contact maxim direct at 1-888-629-4642, or visit maxim? website at www.maxim-ic.com. ordering information continued at end of data sheet. + denotes a lead(pb)-free/rohs-compliant package. t = tape and reel. max6775/max6776/max6779/max6780/max6781 are available with factory-trimmed hysteresis. specify trim by replacing ? with ??for 0.5%, ??for 5%, or ??for 10% hysteresis. pin configurations appear at end of data sheet. part temp range pin-package max6775 xk_+t -40? to +85? 5 sc70 max6775lt_+t -40? to +85? 6 ?fn max6776 xk_+t -40? to +85? 5 sc70 max6776lt_+t -40? to +85? 6 ?fn max6777 xk+t -40? to +85? 5 sc70 max6777lt+t -40? to +85? 6 ?fn downloaded from: http:///
max6775?ax6781 low-power, 1%-accurate battery monitors in ?fn and sc70 packages 2 _______________________________________________________________________________________ absolute maximum ratings electrical characteristics(v batt = 1.6v to 5.5v, t a = -40? to +85?, unless otherwise specified. typical values are at t a = +25?.) (note 1) stresses beyond those listed under ?bsolute maximum ratings?may cause permanent damage to the device. these are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. exposure to absolute maximum rating conditions for extended periods may affect device reliability. batt to gnd............................................................-0.3v to +6v lbi, lbl, lbh, lbi1, lbi2 to gnd ...............-0.3v to minimum of ((v batt + 0.3v) and +6v) lbo , lbo1 , lbo2 to gnd (open-drain) .................-0.3v to +6v lbo , lbo1 , lbo2 to gnd (push-pull).........-0.3v to minimum of ((v batt + 0.3v) and +6v) input current (all pins) ........................................................20ma output current (all pins) .....................................................20ma continuous power dissipation (t a = +70?) 5-pin sc70 (derate 3.1mw/? above +70?) ..............247mw 6-pin ?fn (derate 2.1mw? above +70?) ..............168mw junction temperature ......................................................+150? storage temperature range .............................-65? to +150? lead temperature (soldering, 10s) .................................+300? parameter symbol conditions min typ max units t a = 0? to +70? 1.0 5.5 operating voltage range(note 2) v batt t a = -40? to +85? 1.2 5.5 v v batt = 3.7v, no load 4 7 supply current i q v batt = 1.8v, no load 3.2 6 ? fixed hysteresis (max6775/max6776/max6779/max6780/max6781) 0.5% hysteresis version 1.2037 1.2159 1.2280 5% hysteresis version 1.1493 1.1609 1.1725 lbi, lbi_ falling threshold(note 3) v lbif 10% hysteresis version 1.0888 1.0998 1.1108 v lbi rising threshold v lbir 1.2098 1.222 1.2342 v lbi input leakage current 0.2v v lbi v batt - 0.2v -5 +5 na adjustable hysteresis (max6777/max6778) lbl, lbh threshold v batt = 1.8v to 5.5v 1.2098 1.222 1.2342 v lbl, lbh input leakage current v batt - 0.2v v lbl/lbh 0.2v -5 +5 na downloaded from: http:///
max6775?ax6781 low-power, 1%-accurate battery monitors in ?fn and sc70 packages _______________________________________________________________________________________ 3 electrical characteristics (continued)(v batt = 1.6v to 5.5v, t a = -40? to +85?, unless otherwise specified. typical values are at t a = +25?.) (note 1) note 1: devices are tested at t a = +25? and guaranteed by design for t a =t min to t max , as specified. note 2: operating range ensures low-battery output is in the correct state. minimum battery voltage for electrical specification is 1.6v. note 3: the rising threshold is guaranteed to be higher than the falling threshold. parameter symbol conditions min typ max units low-battery outputs ( lbo , lbo1 , lbo2 ) propagation delay t pd v lbi_ + 100mv to v lbi_ - 100mv 9 ? startup time v batt rising above 1.6v 3 ms v batt 1.2v, i sink = 100? 0.3 v batt 2.7v, i sink = 1.2ma 0.3 output low (push-pull oropen-drain) v ol v batt 4.5v, i sink = 3.2ma 0.3 v v batt 1.6v, i source = 100? 0.8 x v batt v batt 2.7v, i source = 500? 0.8 x v batt output high (push-pull ) v oh v batt 4.5v, i source = 800? 0.8 x v batt v output leakage current(open-drain) output not asserted, v lbo_ = 5.5v -100 +100 na typical operating characteristics (t a = +25?, unless otherwise noted.) supply current vs. temperature max6775 toc01 temperature ( c) supply current ( a) 60 35 10 -15 3.0 3.5 4.0 4.5 5.0 5.5 6.02.5 -40 85 v batt = 5v v batt = 3.6v v batt = 3v v batt = 2.4v v batt = 1.6v propagation delay vs. temperature max6775 toc02 temperature ( c) propagation delay ( s) 60 35 10 -15 8 9 10 11 12 7 -40 85 v batt = 5v 100mv overdrive v batt = 1.6v maximum transient duration vs. threshold overdrive max6775 toc03 threshold overdrive v th - v cc (mv) maximum transient duration ( s) 100 10 10 20 30 40 50 60 70 0 1 1000 output asserted above this line downloaded from: http:///
max6775?ax6781 low-power, 1%-accurate battery monitors in ?fn and sc70 packages 4 _______________________________________________________________________________________ typical operating characteristics (continued) (t a = +25?, unless otherwise noted.) normalized threshold voltages vs. temperature, max67__a max6775 toc04 temperature ( c) threshold voltage (mv) 60 35 10 -15 -4 -3 -2 -1 0 1 -5 -40 85 normalized at t a = +25 c rising falling normalized threshold voltages vs. temperature, max67__b max6775 toc05 temperature ( c) threshold voltage (mv) 60 35 10 -15 -3 -2 -1 0 1 -4 -40 85 normalized at t a = +25 c rising falling normalized threshold voltages vs. temperature, max67__c max6775 toc06 temperature ( c) threshold voltage (mv) 60 35 10 -15 -2 -1 0 1 -3 -40 85 normalized at t a = +25 c rising falling lbo output voltage vs. sink current max6775 toc07 sink current (ma) output voltage (v) 12 9 6 3 0.1 0.2 0.3 0.4 0.5 0 01 5 v batt = 5.0v v batt = 1.8v v batt = 3.3v lbo output voltage vs. source current max6775 toc08 source current (ma) output voltage (v) 4 3 2 1 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.51.0 05 v batt = 5.0v v batt = 3.3v v batt = 1.8v downloaded from: http:///
max6775?ax6781 low-power, 1%-accurate battery monitors in ?fn and sc70 packages _______________________________________________________________________________________ 5 pin description max6775/ max6776 max6777/ max6778 max6779/ max6780/ max6781 ?fn sc70 ?fn sc70 ?fn name function 1 1 gnd2 reserved. must be connected to gnd. do not use as the onlygnd connection. 2 2 2 2 2 gnd ground 3 3 lbi low-battery input. connect to the resistive divider to set thetrip level. 4444 lbo low-battery output, active-low. when v lbi /v lbl falls below the falling threshold, lbo asserts. lbo deasserts when v lbi /v lbh exceeds the rising threshold voltage. 5 5 n.c. no connection. not internally connected. 6 5 6 5 6 batt battery input. power supply to the device. 1 1 lbh rising-trip-level input. connect to a resistive divider to set therising trip level. 3 3 lbl falling-trip-level input. connect to a resistive divider to set thefalling trip level. 1 lbi2 low-battery input 2. connect to a resistive divider to set thetrip level. 3 lbi1 low-battery input 1. connect to a resistive divider to set thetrip level. 4 lbo1 low-battery output 1, active-low. when v lbi1 falls below the falling threshold voltage, lbo1 asserts. lbo1 deasserts when v lbi1 exceeds the rising threshold voltage. lbo1 is push-pull on the max6779/max6781 and open-drain for the max6780. 5 lbo2 low-battery output 2, active-low. when v lbi2 falls below the falling threshold voltage, lbo2 asserts. lbo2 deasserts when v lbi2 exceeds the rising threshold voltage. lbo2 is open-drain for the max6780/max6781 and push-pull for the max6779. downloaded from: http:///
max6775?ax6781 detailed description these battery monitors have an active-low output thatasserts when the input falls below a set voltage. they also offer hysteresis for noise immunity, and to remove the possibility of output chatter due to battery terminal voltage recovery after load removal. they are available with one or two monitors per package, with push-pull or open-drain outputs, and with internally set or externally adjustable hysteresis (dual-channel devices offer only internally fixed hysteresis). figures 1, 2, and 3 show block diagrams and typical connections. see the selector guide for details. low-battery output all devices are offered with either push-pull or open-drain outputs (see the selector guide ). the max6781 has one push-pull output and one open-drain output,configured as in table 1. on all devices with open-drain outputs an external pullup resistor is required. the open-drain pullup resis- tor can connect to an external voltage up to +6v, regardless of the voltage at batt. low-power, 1%-accurate battery monitors in ?fn and sc70 packages 6 _______________________________________________________________________________________ table 1. max6781 outputs device lbo1 lbo2 max6781 push-pull open-drain lbi1 lbo1 0 1 batt gnd v ref v batt lbi2 lbo2 01 max6779max6780 max6781 hysteresis control figure 2. dual-channel fixed-hysteresis block diagram lbi lbo 0 1 batt gnd r l v ref v batt r h max6775max6776 hysteresis control figure 1. single-channel fixed-hysteresis block diagram lbl lbo 0 1 lbh batt gnd r hyst v ref v batt r h r l max6777max6778 figure 3. single-channel adjustable-hysteresis block diagram downloaded from: http:///
max6775?ax6781 low-power, 1%-accurate battery monitors in ?fn and sc70 packages _______________________________________________________________________________________ 7 the max6779, max6780, and max6781 monitor twobattery levels or two independent voltages. a common application for this type of dual-battery monitor is to use one output as an early warning signal and the other as a dead-battery indicator. hysteresis input hysteresis defines two thresholds, separated by asmall voltage (the hysteresis voltage), configured so the output asserts when the input falls below the falling threshold, and deasserts only when the input rises abovethe rising threshold. figure 4 shows this graphically. hysteresis removes, or greatly reduces, the possibility of the output changing state in response to noise or battery terminal voltage recovery after load removal. fixed hysteresis the max6775/max6776/max6779/max6780/max6781have factory-set hysteresis for ease of use, and reduce component count. for these devices, the absolute hys- teresis voltage is a percentage of the internally generat- ed reference. the amount depends on the device option. ?? devices have 0.5% hysteresis, ??devices have 5% hysteresis, and ??devices have 10% hystere-sis. table 2 presents the threshold voltages for devices with internally fixed hysteresis. adjustable hysteresis the max6777/max6778 offer external hysteresis con-trol through the resistive divider that monitors battery voltage. figure 3 shows the connections for external hysteresis. see the calculating an external hysteresis resistive divider section for more information. applications information resistor-value selection choosing the proper external resistors is a balancebetween accuracy and power use. the input to the volt- age monitor, while high impedance, draws a small cur- rent, and that current travels through the resistive divider, introducing error. if extremely high resistor val- ues are used, this current introduces significant error. with extremely low resistor values, the error becomes negligible, but the resistive divider draws more power from the battery than necessary and shortens battery life. figure 1 calculates the optimum value for r h using: where e a is the maximum acceptable absolute resistive divider error (use 0.01 for 1%), v batt is the battery volt- age at which lbo should activate, and i l is the worst- case lbi leakage current. for example, with 0.5%accuracy, a 2.8v battery minimum, and 5na leakage, r h = 2.80m ? . calculate r l using: where v lbif is the falling threshold voltage from table 2. continuing the above example, select v lbif = 1.0998v (10% hysteresis device) and r l = 1.81m ? . r vx r vv l lbif h lbif batt = r exv i h a batt l = v batt lbo v lbir v lbif v hyst t pd t pd max6775max6776 figure 4. hysteresis table 2. typical falling and rising thresholds formax6775/max6776/max6779/max6780/max6781 device option percent hysteresis (%) falling threshold (v lbif ) (v) rising threshold (v lbir ) (v) hysteresis voltage (v hyst ) (mv) a 0.5 1.2159 1.222 6.11 b 5 1.1609 1.222 61.1 c 10 1.0998 1.222 122 downloaded from: http:///
max6775?ax6781 low-power, 1%-accurate battery monitors in ?fn and sc70 packages 8 _______________________________________________________________________________________ selector guide part lbo output output type hysteresis pin-package max6775xk_+t single push-pull fixed 5 sc70 max6775lt_+t single push-pull fixed 6 ?fn max6776xk_+t single open-drain fixed 5 sc70 max6776lt_+t single open-drain fixed 6 ?fn max6777xk+t single push-pull adjustable 5 sc70 max6777lt+t single push-pull adjustable 6 ?fn max6778xk+t single open-drain adjustable 5 sc70 max6778lt+t single open-drain adjustable 6 ?fn max6779lt_+t dual push-pull fixed 6 ?fn max6780lt_+t dual open-drain fixed 6 ?fn max6781lt_+t dual mixed fixed 6 ?fn calculating an external hysteresis resistive divider setting the hysteresis externally requires three externalresistors, as shown in figure 3. select r h using the fol- lowing formula:where e a is the allowable error due to input leakage current (typically 0.005 or less), v batt_rising is the desired rising threshold, and i l is the worst-case leak- age current (5na). then calculate r lo (which is the sum of r l and r hyst ): where v lbi is 1.222v and v batt_falling is the desired falling threshold. calculate r l using: and finally, calculate r hyst : monitoring a battery voltage higher than the allowable v batt for monitoring higher voltages, supply power to battthat is within the specified supply range, and power the input resistive divider from the high voltage to be moni- tored. do not exceed the absolute maximum ratings . adding external capacitance to reduce noise and transients if monitoring voltages in a noisy environment, add abypass capacitor of 0.1? from batt to gnd as close as possible to the device. for systems with large tran- sients, additional capacitance may be required. a small capacitor (<1nf) from lbi_ to gnd may provide addi- tional noise immunity. rrr hyst lo l = r vrr v l lbi h lo batt rising = + () _ r vr vv lo lbi h batt falling lbi = _ r ev i h a batt rising l _ downloaded from: http:///
max6775?ax6781 low-power, 1%-accurate battery monitors in ?fn and sc70 packages _______________________________________________________________________________________ 9 top marks part top mark max6775 xka+t asa max6775xkb+t asb max6775xkc+t asc max6775lta+t bu MAX6775LTB+t bw max6775ltc+t bx max6776 xka+t asj max6776xkb+t ask max6776xkc+t asl max6776lta+t by max6776ltb+t bz max6776ltc+t ca part top mark max6777 xk+t asd max6777lt+t cb max6778 xk+t asi max6778lt+t cc max6779 lta+t bl max6779ltb+t bm max6779ltc+t bn max6780 lta+t bo max6780ltb+t bp max6780ltc+t bq max6781 lta+t br max6781ltb+t bs max6781ltc+t bt ordering information (continued) part temp range pin-package max6778 xk+t -40? to +85? 5 sc70 max6778lt+t -40? to +85? 6 ?fn max6779 lt_+t -40? to +85? 6 ?fn max6780 lt_+t -40? to +85? 6 ?fn max6781 lt_+t -40? to +85? 6 ?fn + denotes a lead(pb)-free/rohs-compliant package. t = tape and reel. max6775/max6776/max6779/max6780/max6781 are available with factory-trimmed hysteresis. specify trim by replacing ? with ??for 0.5%, ??for 5%, or ??for 10% hysteresis. chip information process: bicmos downloaded from: http:///
max6775?ax6781 low-power, 1%-accurate battery monitors in ?fn and sc70 packages 10 ______________________________________________________________________________________ gnd lbo lbi 1 5 batt gnd2 max6775max6776 sc70 + + top view 234 123 4 5 6 batt lbo n.c. gnd2 lbi gnd max6775max6776 dfn 123 4 5 6 batt lbo n.c. lbh lbl gnd max6777max6778 dfn 123 4 5 6 batt lbo1 lbo2 lbi2 lbi1 gnd max6779max6780 max6781 dfn gnd lbo lbl 1 5 batt lbh max6777max6778 sc70 234 pin configurations package type package code document no. 5 sc70 x5-1 21-0076 6 ?fn l611-1 21-0147 package information for the latest package outline information and land patterns, go to www.maxim-ic.com/packages . downloaded from: http:///
max6775?ax6781 low-power, 1%-accurate battery monitors in ?fn and sc70 packages heaney maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a maxim product. no circuit patent licenses are implied. maxim reserves the right to change the circuitry and specifications without notice at any time. maxim integrated products, 120 san gabriel drive, sunnyvale, ca 94086 408-737-7600 ____________________ 11 2009 maxim integrated products maxim is a registered trademark of maxim integrated products, inc. revision history revision number revision date description pages changed 4 5/09 updated calculating an external hysteresis resistive divider section 8 downloaded from: http:///

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