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general description the max6427?ax6438 are single/dual-level battery mon- itors with internal hysteresis. these devices are offered with single (max6427/max6428/max6429, max6433/ max6434/max6435) or dual (max6430/max6431/ max6432, max6436/max6437/max6438) low-battery out- put indicators, which can be used to indicate three battery conditions: battery is good (operate system in normal mode), battery is weak (operate system in low-power mode), or battery is empty (disable the system). these devices are ideal for monitoring single lithium-ion (li+) cells or multicell alkaline/nicd/nimh power supplies. when the power-supply voltage drops below the specified low threshold, the low-battery output asserts. when the voltage rises above the specified high threshold, the low- battery output is deasserted following a 140ms minimum timeout period. the timeout period ensures that the supply voltages have stabilized before power-converter or micro- processor activity is enabled. the max6427?ax6438 family is available with several monitoring options. the max6427/max6428/max6429 offer factory-trimmed battery-monitor thresholds, with a sin- gle low-battery output. the max6430/max6431/max6432 also feature factory-trimmed thresholds, but have two low- battery outputs. the max6433?ax6438 have user-adjustable threshold voltages permitting the user to select the hysteresis range, and consequently the sensitivity of the system to noise. a wide hysteresis range also prevents chattering that can result due to battery recovery after load removal. single low-battery outputs are supplied by the max6433/ max6434/max6435 and dual low-battery outputs by the max6436/max6437/max6438. the max6427?ax6438 family is available with three out- put logic options for convenient interface with system power circuitry or microprocessors. the family is offered in small sot23 and sot143 packages and is fully specified over temperature. ________________________applications battery-powered systems (single-cell li+ or two/three-cell nimh, nicd, alkaline) cell phones/cordless phones pagers portable medical devices pdas electronic toys mp3 players features factory-trimmed or user-adjustable threshold options factory-trimmed low thresholds from 1.6v to 2.1v or 2.6v to 3.1v in 100mv increments (max6427?ax6432) factory-trimmed high thresholds from 2.3v to 2.6v or 3.3v to 3.6v in 100mv increments (max6427?ax6432) user-adjustable low/high thresholds with 615mv internal reference (max6433?ax6438) low current (1? typ) single or dual low-battery outputs push-pull lbo , open-drain lbo , and open-drain lbo options 140ms minimum lbo timeout period immune to short battery voltage transients guaranteed valid lbo logic state to batt = 1.0v -40? to +85? operating temperature range small 3, 4, 5 and 6-pin sot packages no external components required (max6427?ax6432) max6427?ax6438 low-power, single/dual-level battery monitors with hysteresis ________________________________________________________________ maxim integrated products 1 19-2323; rev 0; 1/02 for pricing, delivery, and ordering information, please contact maxim/dallas direct! at 1-888-629-4642, or visit maxim? website at www.maxim-ic.com. ordering information typical operating circuit appears at end of data sheet. part temp range pin-package max6427 _ _ur-t -40 c to +85 c 3 sot23-3 ordering information continued at end of data sheet. pin configurations continued at end of data sheet. ? the max6427?ax6432 are available with factory-trimmed battery-monitor thresholds. select the desired thresholds using tables 1 or 2 and enter the corresponding letters in the part number by replacing ? _? note: there are 26 standard versions with a required order minimum of 2500 pieces. sample stock is generally held on the standard versions only (see standard versions table). required order increment is 10,000 pieces for nonstandard versions. contact factory for availability. all devices avail- able in tape-and-reel only. batt 1 3 gnd ( ) are for the max6429 max6427 max6428 max6429 sot23-3 top view 2 lbo (lbo) pin configurations
max6427?ax6438 low-power, single/dual-level battery monitors with hysteresis 2 _______________________________________________________________________________________ absolute maximum ratings electrical characteristics (batt = 1.0v to 5.5v or v dd = 1.6v to 5.5v, t a = -40 c to +85 c, unless otherwise specified. typical values are at t a = +25 c.) (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. batt, v dd to gnd ................................................-0.3v to +6.0v hthin, lthin inputs to gnd.....................-0.3v to (v dd + 0.3v) open-drain lbo /lbo, lboh /lboh, lbol /lbol to gnd .........................................-0.3v to +6.0v push-pull lbo /lbo, lboh /lboh, lbol /lbol to gnd ................-0.3v to (batt or v dd + 0.3v) input current (all pins) ........................................................20ma output current (all pins) .....................................................20ma continuous power dissipation (t a = +70 c) 3-pin sot23-3 (derate 4.0mw/ c above +70 c) .......320mw 4-pin sot143-4 (derate 4.0mw/ c above +70 c) .....320mw 5-pin sot23-5 (derate 7.1mw/ c above +70 c) .......571mw 6-pin sot23-6 (derate 8.7mw/ c above +70 c) .......696mw operating temperature range ...........................-40 c to +85 c junction temperature ......................................................+150 c storage temperature range .............................-65 c to +150 c lead temperature (soldering, 10s) .................................+300 c parameter symbol conditions min typ max units t a = -40 c to +85 c 1.2 5.5 operating voltage range v batt t a = 0 c to +70 c 1.0 5.5 v operating voltage range v dd t a = -40 c to +85 c 1.6 5.5 v batt supply current i batt batt = 3.7v, no load (max6427 max6432) 1 1.5 a v dd supply current i dd v dd = 3.7v, no load (max6433 max6438) 1 1.5 a factory-fixed thresholds (max6427 max6432) hth threshold (note 2) v hth factory-fixed options, batt rising, lbo deasserted when batt rises above v hth (max6427/max6428/max6429) -2.5 +2.5 % lth threshold (note 2) v lth factory-fixed options, batt falling, lbo asserted when batt falls below v lth (max6427/max6428/max6429) -2.5 +2.5 % hth- threshold (note 2) v hth- factory-fixed options, batt falling, lboh asserted when batt falls below v hth- (max6430/max6431/max6432) -2.5 +2.5 % hth+ threshold (note 3) v hth+ factory-fixed options, batt rising, lboh deasserted when batt rises above v hth+ (max6430/max6431/max6432) -2.5 +2.5 % lth- threshold (note 2) v lth- factory-fixed options, batt falling, lbol asserted when batt falls below v lth- (max6430/max6431/max6432) -2.5 +2.5 % lth+ threshold (note 3) v lth+ factory-fixed options, batt rising, lbol deasserted when batt rises above v lth+ (max6430/max6431/max6432) -2.5 +2.5 %
max6427?ax6438 low-power, single/dual-level battery monitors with hysteresis _______________________________________________________________________________________ 3 electrical characteristics (continued) (batt = 1.0v to 5.5v or v dd = 1.6v to 5.5v, t a = -40 c to +85 c, unless otherwise specified. typical values are at t a = +25 c.) (note 1) parameter symbol conditions min typ max units user-adjustable thresholds (max6433 max638) hthin threshold (note 4) v hthin user-adjustable options, hthin rising, lbo is deasserted when hthin rises above v hthin- , v ref = 615mv (max6433/max6434/max6435) -2.5 +2.5 % lthin threshold (note 4) v lthin user-adjustable options, lthin falling, lboh is asserted when lthin falls below v lthin- , v ref = 615mv (max6433/max6434/max6435) -2.5 +2.5 % hthin+ threshold (note 4) v hthin+ user-adjustable options, hthin rising, lboh is deasserted when hthin rises above v hthin+ , v ref = 615mv (max6436/max6437/max6438) -2.5 +2.5 % hthin- threshold (note 5) v hthin- user-adjustable options, hthin falling, lboh is asserted when hthin falls below v hthin- , v ref = 585mv (max6436/max6437/max6438) -2.5 +2.5 % lthin+ threshold (note 4) v lthin+ user-adjustable options, lthin rising, lbol is deasserted when lthin rises above v lthin+ , v ref = 615mv (max6436/max6437/max6438) -2.5 +2.5 % lthin- threshold (note 5) v lthin- user-adjustable options, lthin falling, lbol is asserted when lthin falls below v lthin- , v ref = 585mv (max6436/max6437/max6438) -2.5 +2.5 % hthin/lthin leakage current (note 6) i lkg v hthin or v lthin > 400mv 20 na
max6427?ax6438 low-power, single/dual-level battery monitors with hysteresis 4 _______________________________________________________________________________________ note 1: production testing done at t a = +25 c, limits over temperature guaranteed by design only. note 2: percentage of selected factory-fixed hth- or lth- threshold voltage. note 3: percentage of 1.05 ? (selected factory-fixed threshold voltage). note 4: percentage of 615mv voltage reference. note 5: percentage of 585mv voltage reference. note 6: guaranteed by design. note 7: v supply is batt or v dd . electrical characteristics (continued) (batt = 1.0v to 5.5v or v dd = 1.6v to 5.5v, t a = -40 c to +85 c, unless otherwise specified. typical values are at t a = +25 c.) (note 1) parameter symbol conditions min typ max units low-battery outputs ( lbo , lbo, lboh , lboh, lbol , lbol ) timeout period t lbop batt or v dd /hthin/lthin rising above threshold 140 210 280 ms delay t lbod batt or v dd /hthin/lthin falling below threshold 100 s batt or v dd 1.6v, i sink = 100a, asserted low 0.3 batt or v dd 2.7v, i sink = 1.2ma, asserted low 0.3 lbo/lbol/lboh output low (push-pull or open-drain) v ol batt or v dd 4.5v, i sink = 3.2ma, asserted low 0.4 v batt or v dd 1.6v, i source = 200a, deasserted 0.8 v supply batt or v dd 2.7v, i source = 500a, deasserted 0.8 v supply lbo output high (push-pull only) (note 7) v oh batt or v dd 4.5v, i source = 800a, deasserted 0.8 v supply v lbo output leakage current (open-drain only) i lkg lbo deasserted 500 na batt or v dd 1.6v, i sink = 100a, deasserted low 0.3 batt or v dd 2.7v, i sink = 1.2ma, deasserted low 0.3 lbo/lbol/lboh output low (open-drain only) v ol batt or v dd 4.5v, i sink = 3.2ma, deasserted low 0.4 v lbo output leakage current (open-drain only) i lkg lbo asserted 500 na
0 0.6 0.3 1.2 0.9 1.5 1.8 -40 20 40 -20 0 60 80 supply current vs. temperature max6427 toc01 temperature ( c) supply current ( a) v batt = 5v v batt = 3.3v v batt = 2v lbo not asserted 1.010 1.005 1.000 0.995 0.990 -40 20 -20 0 40 60 80 normalized lbo timeout period vs. temperature max6427 toc02 temperature ( c) normalized lbo timeout period 80 60 40 20 0 10 100 1000 maximum transient duration vs. lbo comparator overdrive max6427 toc03 lbo comparator overdrive (mv) maximum transient duration ( s) output does not assert output asserts 0.950 0.975 1.025 1.000 1.050 -40 0 -20 20 40 60 80 normalized upper and lower trip voltages vs. temperature max6427 toc04 temperature ( c) normalized trip voltages (v) lower trip voltage upper trip voltage 0 100 50 200 150 250 300 010 max6427 toc05 i sink (ma) 4 268 lbo output vs. i sink lbo output (mv) open-drain lbo asserted max6427?ax6438 low-power, single/dual-level battery monitors with hysteresis _______________________________________________________________________________________ 5 typical operating characteristics (t a = +25 c, unless otherwise noted.)
max6427?ax6438 low-power, single/dual-level battery monitors with hysteresis 6 _______________________________________________________________________________________ pin description pin m ax6427/ m ax6428/ m ax6429 m ax6430/ m ax6431/ m ax6432 m ax6433/ m ax6434/ m ax6435 m ax6436/ m ax6437/ m ax6438 name function 1 4 lbo / lbo low-battery output. lbo /lbo is asserted when batt drops below v lth (max6427/max6428/max6429) or when lthin (max6433/max6434/max6435) drops below v lthin , and remains asserted for at least 140ms after batt exceeds v hth (max6427/max6428/max6429) or v hthin (max6433/ max6434/max6435). 23 batt battery-voltage input. input for battery-voltage threshold monitors and device power supply for factory-trimmed threshold versions. 3 1 2 2 gnd ground 2 5 lboh / lboh low-battery output high. lboh /lboh is asserted when batt drops below v hth- (max6430/max6431/max6432) or when hthin drops below v hthin- (max6436/max6437/ max6438). it remains asserted for at least 140ms after batt exceeds v hth+ (max6430/max6431/max6432) or hthin rises above v hthin+ (max6436/max6437/max6438). 4 4 lbol / lbol low-battery output low. lbol /lbol is asserted when batt drops below v lth- (max6430/max6431/max6432) or when lthin drops below v lthin- (max6436/max6437/ max6438). it remains asserted for at least 140ms after batt exceeds v lth+ (max6430/max6431/max6432) or lthin rises above v lthin+ (max6436/max6437/max6438). 1 1 hthin hth threshold monitor input. a resistor-divider network sets the high threshold associated with lboh /lboh. 3 3 lthin lth threshold monitor input. a resistor-divider network sets the low threshold associated with lbol /lbol. 56v dd v dd supply voltage input. device power supply for adjustable threshold versions.
max6427?ax6438 low-power, single/dual-level battery monitors with hysteresis _______________________________________________________________________________________ 7 detailed description the max6427 max6438 family is available with several monitoring options. the max6427/max6428/max6429 offer factory-trimmed battery-monitor thresholds, with a single low-battery output (see figure 1). the max6430/max6431/max6432 also feature factory- trimmed thresholds, but have two low-battery outputs (see figure 2). the factory-trimmed thresholds of the max6427 max6432 eliminate the requirement for external components. the user sets the threshold voltages for the max6433 max6438, which permit the user to select the hysteresis range, and consequently the sensitivity of the system to noise. a wide hysteresis range pre- vents chattering that can result during battery recovery or load removal. the max6433/max6434/ max6435 have single low-battery outputs and the max6436/ max6437/max6438 have dual low-battery outputs (see figures 3 and 4). the max6427 max6438 combine a 615mv reference with two comparators, logic, and timing circuitry to pro- vide the user with information about the charge state of the power-supply batteries. the max6427 max6438 monitor separate high-voltage and low-voltage thresh- olds to determine battery status. the output(s) can be used to signal when the battery is charged, when the battery is low, and when the battery is empty. factory- trimmed thresholds are ideal for monitoring single-cell li+ or multicell alkaline/nicd/nimh power supplies. user-programmable versions are also available with thresholds determined using an external resistor- divider (see resistor-value selection ).the adjustable versions can monitor down to 0.62v, making them suit- able for monitoring single-cell alkaline, nimh, and nicd applications (v dd 1.6v). when the power-supply voltage drops below the speci- fied low threshold, the low-battery output asserts (see low-battery output ). when the voltage rises above the specified high threshold following a 140ms (min) time- out period, the low-battery output is deasserted (see threshold monitoring ). this ensures the supply voltage has stabilized before power-converter or microproces- sor activity is enabled. low-battery output the low-battery outputs are available in active-low ( lbo , lboh , lbol , push-pull and open-drain) and active-high (lbo, lbol, lboh, open-drain) configura- tions. push-pull outputs are referenced to batt (for factory-trimmed versions) or v dd (for adjustable thresh- old versions). the open-drain devices can be pulled to a voltage inde- pendent of v dd or batt, up to 5.5v. this allows the r s q lbo timeout period v batt v batt ( ) are for the max6429 615 mv + - q lbo (lbo) figure 1. max6427/max6428/max6429 functional diagram
max6427?ax6438 low-power, single/dual-level battery monitors with hysteresis 8 _______________________________________________________________________________________ device to monitor and operate from direct battery voltage while interfacing to higher voltage microprocessors. the max6427/max6428/max6429/max6433/max6434/ max6435 single-output voltage monitors provide a sin- gle low-battery output, lbo/ lbo . the max6427/ max6428/max6429 fixed-threshold parts assert lbo/ lbo when batt drops below v lth . the max6433/max6434/max6435 adjustable-threshold parts assert lbo/ lbo when the lthin input drops below the v lthin threshold (615mv) (see figure 5). the max6430/max6431/max6432/max6436/max6437/ max6438 dual-output voltage monitors provide two low- battery outputs, lboh/ lboh and lbol/ lbol . the max6430/max6431/max6432 fixed-threshold parts assert lboh/ lboh when batt drops below v hth- , and assert lbol/ lbol when batt drops below v lth- . the max6436/max6437/max6438 adjustable-thresh- old parts assert lboh/ lboh when hthin drops below v hthin- , and assert lbol/ lbol when lthin drops below v lthin- (see figure 6). threshold monitoring the max6433 max6438 hthin and lthin inputs are high-impedance inputs to comparators. an external resis- tor-divider network is required between the monitored voltage, hthin, lthin, and gnd to select the desired thresholds (see resistor-value selection ). the max6433/max6434/max6435 single-output voltage monitors assert lbo/ lbo when lthin drops below the internal lthin reference (615mv). lbo/ lbo is deassert- ed when hthin rises above the internal hthin reference level (615mv) for at least 140ms (see figure 6). the max6436/max6437/max6438 dual-output voltage monitors assert lbol/ lbol when lthin drops below the lthin- threshold and deassert lbol/ lbol when lthin rises above the lthin+ threshold for at least 140ms. lboh/ lboh is asserted when hthin drops below the hthin- threshold and is deasserted when hthin rises above the hthin+ threshold for at least 140ms (see figure 7). (lbol) lbo timeout period ( ) are for the max6432 hysteresis switch hysteresis switch v batt v batt 615 mv lbol lboh (lboh) + - figure 2. max6430/max6431/max6432 functional diagram
max6427?ax6438 low-power, single/dual-level battery monitors with hysteresis _______________________________________________________________________________________ 9 hysteresis hysteresis increases the comparator s noise margin by increasing the upper threshold or decreasing the lower threshold (see figure 8). the hysteresis prevents the output from oscillating (chattering) when batt or v dd is near the low-battery threshold. this is especially important for applications where the load on the battery creates significant fluctuations in battery voltages. fixed hysteresis (max6427?ax6432) the max6427/max6428/max6429 total hysteresis is the difference between the factory-trimmed v lth and v hth. for the max6430/max6431/max6432, the total hysteresis is the difference between the factory-trimmed v hth- and v hth+ or v lth- and v lth+ values, approximately 5%. adjustable hysteresis (max6433?ax6438) figure 7 shows the correct connections for the external resistor-dividers. to adjust the low-battery threshold and hysteresis connect resistor r1 between v dd and lthin, resistor r2 between lthin and hthin, and r3 between hthin and gnd. the hysteresis for the max6433 max6438 is determined by an external resis- tor-divider network (see resistor-value selection sec- tion of applications information). the hysteresis for the max6436/max6437/max6438 is the differences between v hthin- and v hthin+ (~5%) or v lthin- and v lthin+ (~5%). r q s q lbo timeout period v batt v dd lthin hthin ( ) are for the max6435 external resistor- divider 615 mv v dd lbo (lbo) + - figure 3. max6433/max6434/max6435 functional diagram
max6427?ax6438 low-power, single/dual-level battery monitors with hysteresis 10 ______________________________________________________________________________________ (lbol) lbo timeout period ( ) are for the max6438 (lboh) hysteresis switch hysteresis switch v batt lthin hthin v batt 615 mv v dd lbol lboh + - figure 4. max6436/max6437/max6438 functional diagram v batt v hth v lth lbo t lbop t lbop figure 5. single low-battery output timing
max6427?ax6438 low-power, single/dual-level battery monitors with hysteresis ______________________________________________________________________________________ 11 v batt v hth+ v hth- v lth+ v lth- lboh lbol t lbop t lbop t lbop t lbop figure 6. dual low-battery output timing max6433 v dd v dd lthin hthin gnd r1 r2 r3 lbo lbo figure 7. adjustable threshold selection v batt lbo t lbop v hth v lth v hyst hth = battery voltage good, enable operation. lth = battery voltage low, suspend/disable operation. figure 8. hysteresis
max6427?ax6438 low-power, single/dual-level battery monitors with hysteresis 12 ______________________________________________________________________________________ applications information resistor-value selection (programming the adjustable thresholds) max6433/max6434/max6435 use the following steps to determine values for r1, r2, and r3 of figure 8. 1) choose a value for r total , the sum of r1, r2, and r3. because the max6433/max6434/max6435 have very high input impedances, r total can be up to 5m ? . 2) calculate r3 based on r total and the desired upper trip point: 3) calculate r2 based on r total , r3, and the desired lower trip point: 4) calculate r1 based on r total , r3, and r2: max6436/max6437/max6438 use the following steps to determine values for r1, r2, and r3 of figure 8. 1) choose a value for r total , the sum of r1, r2, and r3. because the max6436/max6437/max6438 have very high input impedances, r total can be up to 5m ? . 2) calculate r3 based on r total and the desired upper trip point: 3) calculate r2 based on r total , r3, and the desired lower trip point: 4) calculate r1 based on r total , r3, and r2: v hth+ = v hth- ? 1.05, v lth+ = v lth- ? 1.05 dc-to-dc converter application the max6430/max6431/max6432 and max6436/ max6437/max6438 dual-output battery monitors can be used in conjunction with a step-up dc-to-dc con- verter to power 5v microprocessor systems using a sin- gle li+ cell or two to three alkaline/nicd/nimh cells (figure 9). the lboh output indicates that the battery voltage is weak, and is used to warn the microproces- sor of potential problems. armed with this information the microprocessor can reduce system power con- sumption. the lbol output indicates the battery is empty, and system power should be disabled. by con- necting lbol to the shdn pin of the dc-to-dc con- verter, power to the microprocessor is removed. microprocessor power will not return until the battery has recharged to a voltage greater than hth+ (figure 6). rr rr total 123 = ?? 615 3 mv r v r total triplow ? r vr v mv r v ref total triphigh total triphigh 3 615 = = vv v mv vvv rr r rr vvv rr r r rrrr ref lthin hthin triplow lth ref triphigh htl ref total === == ++ + ? ? ? ? ? ? == ++ ? ? ? ? ? ? =+ + -- - - 585 12 3 23 12 3 3 12 3 rr rr total 123 = ?? r mv r v r total triplow 2 615 3 = ? r vr v mv r v ref total triphigh total triphigh 3 615 = = vv v mv vvv rr r rr vvv rr r r rrrr ref lthin hthin triplow lth ref triphigh htl ref total === == ++ + ? ? ? ? ? ? == ++ ? ? ? ? ? ? =+ + 615 12 3 23 12 3 3 12 3 figure 9. dc-to-dc converter application p v batt nmi v cc dc/dc batt out in max6431 lbol lboh shdn gnd gnd
max6427?ax6438 low-power, single/dual-level battery monitors with hysteresis ______________________________________________________________________________________ 13 li+ battery charger application the max6430/max6431/max6432 and max6436/ max6437/max6438 dual-output battery monitors can be used in conjunction with a battery charger to pro- vide a system with additional information about the bat- tery charge state (figure 10). many battery chargers, such as the max1879, provide the user with a chg output, which tells the system that the battery is charged. the max6430/max6431/max6432 and max6436/max6437/max6438 dual-output battery mon- itors provide two outputs, which can be used to relay the battery condition to the system. this information is useful in determining which system resources can be powered by the battery at the current charge state. figure 10. lithium-ion cell charger application (using max1879) batt gnd 1-cell li+ battery therm adj gate current- limited ac wall adapter pulse-width select input chg led thermistor in max1879 max6430 tsel gnd lbol lboh v batt max6427 v batt p batt v cc lbo nmi typical operating circuit
max6427?ax6438 low-power, single/dual-level battery monitors with hysteresis 14 ______________________________________________________________________________________ chip information transistor count: 905 process technology: bicmos ? the max6427?ax6432 are available with factory-trimmed battery-monitor thresholds. select the desired thresholds using tables 1 or 2 and enter the corresponding letters in the part number by replacing ? _? note: there are 26 standard versions with a required order minimum of 2500 pieces. sample stock is generally held on the standard versions only (see standard versions table). required order increment is 10,000 pieces for nonstandard versions. contact factory for availability. all devices avail- able in tape-and-reel only. ordering information (continued) part temp range pin-package max6428 _ _ur-t -40 c to +85 c 3 sot23-3 max6429 _ _ur-t -40 c to +85 c 3 sot23-3 max6430 _ _us-t -40 c to +85 c 4 sot143-4 max6431 _ _us-t -40 c to +85 c 4 sot143-4 max6432 _ _us-t -40 c to +85 c 4 sot143-4 max6433 uk-t -40 c to +85 c 5 sot23-5 max6434 uk-t -40 c to +85 c 5 sot23-5 max6435 uk-t -40 c to +85 c 5 sot23-5 max6436 ut-t -40 c to +85 c 6 sot23-6 max6437 ut-t -40 c to +85 c 6 sot23-6 max6438 ut-t -40 c to +85 c 6 sot23-6 pin configurations (continued) 1 2 4 3 batt ( ) are for the max6432 lboh (lboh) gnd max6430 max6431 max6432 sot143-4 lbol (lbol) gnd lbo (lbo) lthin ( ) are for the max6435 15 v dd hthin max6433 max6434 max6435 sot23-5 2 34 gnd lbol (lbol) lthin 16 v dd 5 lboh (lboh) hthin max6436 max6437 max6438 sot23-6 2 34 ( ) are for the max6438
max6427?ax6438 low-power, single/dual-level battery monitors with hysteresis ______________________________________________________________________________________ 15 upper threshold (hth/hth-) voltages 3.3v 3.4v 3.5v 3.6v 2.6v ag ah ai aj 2.7v bg bh bi bj 2.8v cg ch ci cj 2.9v dg dh di dj 3.0v eg eh ei ej 3.1v fg fh fi fj table 1. factory-trimmed lower and upper threshold combinations for single-cell li+ or three-cell alkaline/nicd/nimh applications (max6427 max6432) upper threshold (hth/hth-) voltages 2.3v 2.4v 2.5v 2.6v 1.6v kq kr ks kt 1.7v lq lr ls lt 1.8v mq mr ms mt 1.9v nq nr ns nt 2.0v oq or os ot 2.1v pq pr ps pt part top mark max6427dh fzkz max6427eh fzla max6427ei fzlb max6427mr fzlf max6427or fzlg max6428dh fzlc max6428eh fzld max6428ei fzle max6428mr fzlh max6428or fzli max6430dh kaep max6430eh kaeq max6430ei kaer table 2. factory-trimmed lower and upper threshold combinations for two-cell alkaline/nicd/nimh applications (max6427 max6432) lower threshold (lth/lth-) lower threshold (lth/lth-) standard versions part top mark max6430mr kael max6430or kaem max6431dh kaes max6431eh kaet max6431ei kaeu max6431mr kaen max6431or kaeo max6433uk advh max6434uk advi max6435uk advj max6436ut abab max6437ut abac max6438ut abad
max6427?ax6438 low-power, single/dual-level battery monitors with hysteresis 16 ______________________________________________________________________________________ selector guide part factory- fixed thresholds user- adjustable thresholds active- low push- pull output active- low open- drain output active- high open- drain output single output dual output max6427 max6428 max6429 max6430 max6431 max6432 max6433 max6434 max6435 max6436 max6437 max6438
max6427?ax6438 low-power, single/dual-level battery monitors with hysteresis ______________________________________________________________________________________ 17 package information sotpo3l.eps
max6427?ax6438 low-power, single/dual-level battery monitors with hysteresis 18 ______________________________________________________________________________________ package information (continued)
max6427?ax6438 low-power, single/dual-level battery monitors with hysteresis ______________________________________________________________________________________ 19 package information (continued) sot5l.eps
max6427?ax6438 low-power, single/dual-level battery monitors with hysteresis 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. 20 ____________________maxim integrated products, 120 san gabriel drive, sunnyvale, ca 94086 408-737-7600 ? 2002 maxim integrated products printed usa is a registered trademark of maxim integrated products. package information (continued) 6lsot.eps

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