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? 2004 microchip technology inc. ds21823b-page 1 m mcp73841/2/3/4 features ? linear charge management controllers ? high-accuracy preset voltage regulation: -+ 0.5% (max) ? four preset voltage regulation options: - 4.1v - mcp73841-4.1, mcp73843-4.1 - 4.2v - mcp73841-4.2, mcp73843-4.2 - 8.2v - MCP73842-8.2, mcp73844-8.2 - 8.4v - MCP73842-8.4, mcp73844-8.4 ? programmable charge current ? programmable safety charge timers ? preconditioning of deeply depleted cells ? automatic end-of-charge control ? optional continuous cell temperature monitoring (mcp73841 and MCP73842) ? charge status output for direct led drive ? automatic power-down when input power removed ? temperature range: -40c to 85c ? packaging: msop-10 - mcp73841, MCP73842 msop-8 - mcp73843, mcp73844 applications ? lithium-ion/lithium-polymer battery chargers ? personal data assistants ? cellular telephones ? hand-held instruments ? cradle chargers ? digital cameras ? mp3 players typical application circuit description the mcp7384x family of devices are highly advanced linear charge management controllers for use in space-limited, cost-sensitive applications. the mcp73841 and MCP73842 combine high accuracy, constant-voltage, constant-current regulation, cell pre- conditioning, cell temperature monitoring, advanced safety timers, automatic charge termination and charge status indication in space-saving, 10-pin msop packages. the mcp73841 and MCP73842 provide complete, fully-functional, stand-alone charge management solutions. the mcp73843 and mcp73844 employ all the features of the mcp73841 and MCP73842, with the exception of the cell temperature monitor. the mcp73843 and mcp73844 are offered in 8-pin msop packages. the mcp73841 and mcp73843 are designed for applications utilizing single-cell lithium-ion or lithium- polymer battery packs. two preset voltage regulation options are available (4.1v and 4.2v) for use with either coke or graphite anodes. the mcp73841 and mcp73843 operate with an input voltage range of 4.5v to 12v. the MCP73842 and mcp73844 are designed for applications utilizing dual series cell lithium-ion or lithium-polymer battery packs. two preset voltage regulation options are available (8.2v and 8.4v). the MCP73842 and mcp73844 operate with an input voltage range of 8.7v to 12v. the mcp7384x family of devices are fully specified over the ambient temperature range of -40c to +85c. package types + - v ss drv sense v dd v bat stat1 36 7 1 2 mcp73843 8 10 f 10 f 100 k ? 100 m ? 5v single lithium-ion cell nds8434 ma2q705 1a lithium-ion battery charger en 5 timer 4 0.1 f 10-pin msop sense v dd stat1 en drv v bat v ss timer 1 2 3 4 8 7 6 5 mcp73843 mcp73844 8-pin msop v dd stat1 en thref v bat v ss timer therm 2 3 4 5 9 8 7 6 mcp73841 MCP73842 sense drv 1 10 advanced single or dual cell lithium-ion/ lithium-polymer charge management controllers
mcp73841/2/3/4 ds21823b-page 2 ? 2004 microchip technology inc. functional block diagram charge termination comparator voltage control amplifier v ref i reg /10 precondition control charge_ok precon v dd charge current control amplifier + ? v ref v ref precondition comp . v bat v ss drv 90 k ? 90 k ? 10 k ? 10 k ? + ? charge current amplifier v dd sense mcp73841 and MCP73842 only 300 k ? (825 k ? ) 12 k ? 1k ? uvlo comparator v uvlo temperature comparators bias and reference generator v uvlo v ref (1.2v) power-on delay v ref oscillator constant-voltage/ recharge comp. charge control, charge timers, and status logic drv stat 1 charge_ok i reg /10 therm en timer stat1 thref 100 k ? 50 k ? 50 k ? 74.21 k ? 0.79 k ? 150.02 k ? 5.15 k ? (4.29 k ? ) + - + - + - + - + - + - + -
? 2004 microchip technology inc. ds21823b-page 3 mcp73841/2/3/4 1.0 electrical characteristics absolute maximum ratings ? v dd .................................................................................13.5v all inputs and outputs w.r.t. v ss ................ -0.3 to (v dd +0.3)v current at drv pin ......................................................4 ma current at stat1 pin .................................................30 ma maximum junction temperature, t j ............................. 150c storage temperature .....................................-65c to +150c esd protection on all pins: human body model (1.5 k ? in series with 100 pf) ....... 2kv machine model (200 pf, no series resistance) .............200v *notice: stresses above those listed under ?maximum ratings? may cause permanent damage to the device. this is a stress rating only and functional operation of the device at those or any other conditions above those indicated in the operational listings of this specification is not implied. expo- sure to maximum rating conditions for extended periods may affect device reliability. dc characteristics electrical specifications: unless otherwise indicated, all limits apply for v dd = [v reg (typ)+0.3v] to 12v, t a = -40c to +85c. typical values are at +25c, v dd = [v reg (typ) + 1v]. parameters sym min typ max units conditions supply input supply voltage v dd mcp73841, mcp73843 4.5 ? 12 v MCP73842, mcp73844 8.7 ? 12 v supply current i ss ? ? 0.25 0.75 4 4 a ma disabled operating v dd =v reg (typ)+1v uvlo start threshold v start mcp73841, mcp73843 4.25 4.45 4.60 v v dd low-to-high MCP73842, mcp73844 8.45 8.65 8.90 v v dd low-to-high uvlo stop threshold v stop mcp73841, mcp73843 4.20 4.40 4.55 v v dd high-to-low MCP73842, mcp73844 8.40 8.60 8.85 v v dd high-to-low voltage regulation (constant-voltage mode) regulated output voltage v reg mcp73841-4.1, mcp73843-4.1 4.079 4.1 4.121 v v dd = [v reg (typ)+1v], i out = 10 ma, t a = -5c to +55c mcp73841-4.2, mcp73843-4.2 4.179 4.2 4.221 v v dd = [v reg (typ)+1v], i out = 10 ma, t a = -5c to +55c MCP73842-8.2, mcp73844-8.2 8.159 8.2 8.241 v v dd = [v reg (typ)+1v], i out = 10 ma, t a = -5c to +55c MCP73842-8.4, mcp73844-8.4 8.358 8.4 8.442 v v dd = [v reg (typ)+1v], i out = 10 ma, t a = -5c to +55c line regulation |(? v bat / v bat )|/ ? v dd ? 0.025 0.25 %/v v dd = [v reg (typ)+1v] to 12v, i out = 10 ma load regulation |? v bat |/v bat ? 0.01 0.25 % i out = 10 ma to 150 ma, v dd = [v reg (typ)+1v] supply ripple attenuation psrr ? -58 ? db i out = 10 ma, 100 hz ?-42? dbi out = 10 ma, 1 khz ?-30? dbi out = 10 ma, 10 khz output reverse leakage current i discharge ?0.41 av dd floating, v bat = v reg (typ) current regulation (fast charge constant-current mode) fast charge current regulation threshold v fcs 100 110 120 mv v dd ? v sense, t a = -5c to +55c
mcp73841/2/3/4 ds21823b-page 4 ? 2004 microchip technology inc. preconditioning current regulation (trickle charge constant-current mode) precondition current regulation threshold v pcs 51015mvv dd ? v sense, t a = -5c to +55c precondition threshold voltage v pth mcp73841-4.1, mcp73843-4.1 2.70 2.80 2.90 v v bat low-to-high mcp73841-4.2, mcp73843-4.2 2.75 2.85 2.95 v v bat low-to-high MCP73842-8.2, mcp73844-8.2 5.40 5.60 5.80 v v bat low-to-high MCP73842-8.4, mcp73844-8.4 5.50 5.70 5.90 v v bat low-to-high charge termination charge termination threshold v tcs 4710mvv dd ? v sense, t a = -5c to +55c automatic recharge recharge threshold voltage v rth mcp73841, mcp73843 v reg - 300 mv v reg - 200 mv v reg - 100 mv vv bat high-to-low MCP73842, mcp73844 v reg - 600 mv v reg - 400 mv v reg - 200 mv vv bat high-to-low external mosfet gate drive gate drive current i drv ? 2 ? ma sink, cv mode ? -0.5 ? ma source, cv mode gate drive minimum voltage v drvmin ??1.0vv dd = 4.5v gate - source clamp voltage v gs -7.0 ? -4.5 v v dd = 12.0v thermistor reference - mcp73841, MCP73842 thermistor reference output voltage v thref 2.475 2.55 2.625 v t a = +25c, v dd = v reg (typ)+1v, i thref = 0 ma temperature coefficient tc thref ?+ 50 ? ppm/c thermistor reference source current i thref 200 ? ? a thermistor reference line regulation |(? v thref / v thref )|/ ? v dd ?0.10.25%/vv dd =[v reg (typ)+1v] to 12v thermistor reference load regulation ? v thref / v thref ? 0.01 0.10 % i thref = 0 ma to 0.20 ma thermistor comparator - mcp73841, MCP73842 upper trip threshold v t1 1.18 1.25 1.32 v upper trip point hysteresis v t1hys ?-50? mv lower trip threshold v t2 0.59 0.62 0.66 v lower trip point hysteresis v t2hys ?80? mv input bias current |i bias | ??2a status indicator sink current i sink 4712ma low output voltage v ol ? 200 400 mv i sink = 1 ma input leakage current i lk ?0.011 ai sink = 0 ma, v stat1 = 12v dc characteristics (continued) electrical specifications: unless otherwise indicated, all limits apply for v dd = [v reg (typ)+0.3v] to 12v, t a = -40c to +85c. typical values are at +25c, v dd = [v reg (typ) + 1v]. parameters sym min typ max units conditions
? 2004 microchip technology inc. ds21823b-page 5 mcp73841/2/3/4 ac characteristics temperature specifications enable input input high-voltage level v ih 1.4 - ? v input low-voltage level v il ?-0.8v input leakage current i lk ?0.011 av enable = 12v electrical specifications: unless otherwise indicated, all limits apply for v dd = [v reg (typ)+0.3v] to 12v, t a = -40c to +85c. typ- ical values are at +25c, v dd = [v reg (typ)+1v]. parameters sym min typ max units conditions uvlo start delay t start ??5msecv dd low-to-high current regulation transition time out of preconditioning t delay ??1msecv bat < v pth to v bat > v pth current rise time out of preconditioning t rise ??1mseci out rising to 90% of i reg fast charge safety timer period t fast 1.2 1.4 1.6 hours c timer = 0.1 f preconditioning current regulation preconditioning charge safety timer period t precon 50 60 70 minutes c timer = 0.1 f charge termination elapsed time termination period t term 2.5 2.9 3.3 hours c timer = 0.1 f status indicators status output turn-off t off ??200seci sink = 10 ma to 0 ma status output turn-on t on ??200seci sink = 0 ma to 10 ma electrical specifications: unless otherwise specified, all limits apply for v dd = [v reg (typ)+0.3v] to 12v. typical values are at +25c, v dd = [v reg (typ)+1.0v]. parameters sym min typ max units conditions temperature ranges specified temperature range t a -40 +85 c operating temperature range t a -40 +125 c storage temperature range t a -65 +150 c thermal package resistances thermal resistance, msop-10 ja 113 c/w 4-layer jc51-7 standard board, natural convection thermal resistance, msop-8 ja 206 c/w single-layer semi g42-88 board, natural convection dc characteristics (continued) electrical specifications: unless otherwise indicated, all limits apply for v dd = [v reg (typ)+0.3v] to 12v, t a = -40c to +85c. typical values are at +25c, v dd = [v reg (typ) + 1v]. parameters sym min typ max units conditions
mcp73841/2/3/4 ds21823b-page 6 ? 2004 microchip technology inc. 2.0 typical performance curves note: unless otherwise indicated, v dd = [v reg (typ) + 1v], i out = 10 ma and t a = +25c. figure 2-1: battery regulation voltage (v bat ) vs. charge current (i out ). figure 2-2: battery regulation voltage (v bat ) vs. supply voltage (v dd ). figure 2-3: battery regulation voltage (v bat ) vs. supply voltage (v dd ). figure 2-4: supply current (i ss ) vs. charge current (i out ). figure 2-5: supply current (i ss ) vs. supply voltage (v dd ). figure 2-6: supply current (i ss ) vs. supply voltage (v dd ). note: the graphs and tables provided following this note are a statistical summary based on a limited number of samples and are provided for informational purposes only. the performance characteristics listed herein are not tested or guaranteed. in some graphs or tables, the data presented may be outside the specified operating range (e.g., outside specified power supply range) and therefore outside the warranted range. 4.196 4.197 4.198 4.199 4.200 4.201 4.202 4.203 10 100 1000 i out (ma) v bat (v) +55c +25c -5c mcp73841-4.2v v dd = 5.2 v 4.196 4.197 4.198 4.199 4.200 4.201 4.202 4.203 4.5 6.0 7.5 9.0 10.5 12.0 v dd (v) v bat (v) +55c +25c -5c mcp73841-4.2v i out = 1000 ma 4.196 4.197 4.198 4.199 4.200 4.201 4.202 4.203 4.5 6.0 7.5 9.0 10.5 12.0 v dd (v) v bat (v) mcp73841-4.2v i out = 10 ma +55c +25c -5c 0.00 0.20 0.40 0.60 0.80 1.00 1.20 1.40 10 100 1000 i out (ma) i ss (ma) +25c +85c -45c mcp73841-4.2v v dd = 5.2 v 0.00 0.20 0.40 0.60 0.80 1.00 1.20 1.40 4.5 6.0 7.5 9.0 10.5 12.0 v dd (v) i ss (ma) +25c +85c -45c mcp73841-4.2v i out = 1000 ma 0.00 0.20 0.40 0.60 0.80 1.00 1.20 1.40 4.5 6.0 7.5 9.0 10.5 12.0 v dd (v) i ss (ma) mcp73841-4.2v i out = 10 ma -45c +25c +85c
? 2004 microchip technology inc. ds21823b-page 7 mcp73841/2/3/4 note: unless otherwise indicated, v dd = [v reg (typ) + 1v], i out = 10 ma and t a = +25c. figure 2-7: battery regulation voltage (v bat ) vs. charge current (i out ). figure 2-8: battery regulation voltage (v bat ) vs. supply voltage (v dd ). figure 2-9: battery regulation voltage (v bat ) vs. supply voltage (v dd ). figure 2-10: supply current (i ss ) vs. charge current (i out ). figure 2-11: supply current (i ss ) vs. supply voltage (v dd ). figure 2-12: supply current (i ss ) vs. supply voltage (v dd ). 8.390 8.392 8.394 8.396 8.398 8.400 8.402 8.404 8.406 8.408 10 100 1000 i out (ma) v bat (v) +55c +25c -5c MCP73842-8.4v v dd = 9.4 v 8.390 8.392 8.394 8.396 8.398 8.400 8.402 8.404 8.406 8.408 8.8 9.2 9.6 10 10.4 10.8 11.2 11.6 12 v dd (v) v bat (v) +55c +25c -5c MCP73842-8.4v i out = 1000 ma 8.390 8.392 8.394 8.396 8.398 8.400 8.402 8.404 8.406 8.408 8.8 9.2 9.6 10.0 10.4 10.8 11.2 11.6 12.0 v dd (v) v bat (v) MCP73842-8.4v i out = 10 ma +55c +25c -5c 0.00 0.20 0.40 0.60 0.80 1.00 1.20 1.40 10 100 1000 i out (ma) i ss (ma) +25c +85c -45c MCP73842-8.4v v dd = 9.4 v 0.00 0.20 0.40 0.60 0.80 1.00 1.20 1.40 8.8 9.2 9.6 10.0 10.4 10.8 11.2 11.6 12.0 v dd (v) i ss (ma) +25c +85c -45c MCP73842-8.4v i out = 1000 ma 0.00 0.20 0.40 0.60 0.80 1.00 1.20 1.40 8.8 9.2 9.6 10.0 10.4 10.8 11.2 11.6 12.0 v dd (v) i ss (ma) MCP73842-8.4v i out = 10 ma -45c +25c +85c
mcp73841/2/3/4 ds21823b-page 8 ? 2004 microchip technology inc. note: unless otherwise indicated, v dd = [v reg (typ) + 1v], i out = 10 ma and t a = +25c. figure 2-13: output reverse leakage current (i discharge ) vs. battery voltage (v bat ). figure 2-14: thermistor reference voltage (v thref ) vs. thermistor bias current (i thref ). figure 2-15: thermistor reference voltage (v thref ) vs. supply voltage (v dd ). figure 2-16: output reverse leakage current (i discharge ) vs. battery voltage (v bat ). figure 2-17: thermistor reference voltage (v thref ) vs. thermistor bias current (i thref ). figure 2-18: thermistor reference voltage (v thref ) vs. supply voltage (v dd ). 0.00 0.05 0.10 0.15 0.20 0.25 0.30 0.35 0.40 0.45 2.0 2.2 2.4 2.6 2.8 3.0 3.2 3.4 3.6 3.8 4.0 4.2 v bat (v) i discharge (a) +25c +85c -45c mcp73841-4.2v v dd = float 2.540 2.542 2.544 2.546 2.548 2.550 2.552 2.554 2.556 2.558 2.560 0 25 50 75 100 125 150 175 200 i thref (a) v thref (v) +85c +25c -45c mcp73841-4.2v v dd = 5.2 v 2.540 2.544 2.548 2.552 2.556 2.560 2.564 2.568 4.5 6.0 7.5 9.0 10.5 12.0 v dd (v) v thref (v) +85c +25c -45c mcp73841-4.2v i thref = 100 a 0.00 0.10 0.20 0.30 0.40 0.50 0.60 0.70 0.80 0.90 4.0 4.4 4.8 5.2 5.6 6.0 6.4 6.8 7.2 7.6 8.0 8.4 v bat (v) i discharge (a) MCP73842-8.4v v dd = float -45c +25c +85c 2.540 2.542 2.544 2.546 2.548 2.550 2.552 2.554 2.556 2.558 2.560 0 25 50 75 100 125 150 175 200 i thref (a) v thref (v) +25c +85c -45c MCP73842-8.4v v dd = 9.4 v 2.540 2.544 2.548 2.552 2.556 2.560 2.564 2.568 8.8 9.2 9.6 10.0 10.4 10.8 11.2 11.6 12.0 v dd (v) v thref (v) MCP73842-8.4v i thref = 100 a +85c +25c -45c
? 2004 microchip technology inc. ds21823b-page 9 mcp73841/2/3/4 note: unless otherwise indicated, v dd = [v reg (typ) + 1v], i out = 10 ma and t a = +25c. figure 2-19: line transient response. figure 2-20: load transient response. figure 2-21: power supply ripple rejection. figure 2-22: line transient response. figure 2-23: load transient response. figure 2-24: power supply ripple rejection. v dd v bat mcp73841-4.2v v dd stepped from 5.2v to 6.2v i out = 10 ma c out = 10 f, x7r, ceramic mcp73841-4.2v v dd = 5.2v c out = 10 f, x7r, ceramic v bat i out 100 ma 10 ma -80 -70 -60 -50 -40 -30 -20 -10 0 0.01 0.1 1 10 100 1000 frequency (khz) attenuation (db) mcp73841-4.2v v dd = 5.2 v v ac = 100 mvp-p i out = 10 ma c out = 10 f, x7r, ceramic v dd v bat mcp73841-4.2v v dd stepped from 5.2v to 6.2v i out = 500 ma c out = 10 f, x7r, ceramic v bat mcp73841-4.2v v dd = 5.2v c out = 10 f, x7r, ceramic i out 500 ma 10 ma -80 -70 -60 -50 -40 -30 -20 -10 0 0.01 0.1 1 10 100 1000 frequency (khz) attenuation (db) mcp73841-4.2v v dd = 5.2 v v ac = 100 mvp-p i out = 100 ma c out = 10 f, x7r, ceramic
mcp73841/2/3/4 ds21823b-page 10 ? 2004 microchip technology inc. 3.0 pin descriptions the descriptions of the pins are listed in table 3-1. table 3-1: pin description table 3.1 charge current sense input (sense) charge current is sensed via the voltage developed across an external precision sense resistor. the sense resistor must be placed between the supply voltage (v dd ) and the external pass transistor (q1). a 220 m ? sense resistor produces a fast charge current of 500 ma, typically. 3.2 battery management input supply (v dd ) a supply voltage of [v reg (typ) + 0.3v] to 12v is recommended. bypass to v ss with a minimum of 4.7 f. 3.3 charge status output (stat1) current limited, open-drain drive for direct connection to a led for charge status indication. alternatively, a pull-up resistor can be applied for interfacing to a host microcontroller. 3.4 logic enable (en) input to force charge termination, initiate charge, clear faults or disable automatic recharge. 3.5 cell temperature sensor bias (thref) voltage reference to bias external thermistor for continuous cell temperature monitoring and prequalification. 3.6 cell temperature sensor input (therm) input for an external thermistor for continuous cell- temperature monitoring and pre-qualification. apply a voltage equal to 0.85v to disable temperature-sensing. 3.7 timer set (timer) all safety timers are scaled by c timer /0.1 f. 3.8 battery management 0v reference (v ss ) connect to negative terminal of battery. 3.9 battery voltage sense (v bat ) voltage sense input. connect to positive terminal of battery. bypass to v ss with a minimum of 4.7 f to ensure loop stability when the battery is disconnected. a precision internal resistor divider regulates the final voltage on this pin to v reg . 3.10 drive output (drv) direct output drive of an external p-channel mosfet for current and voltage regulation. mcp73841, MCP73842 pin no. mcp73843, mcp73844 pin no. name function 1 1 sense charge current sense input 22v dd battery management input supply 3 3 stat1 charge status output 4 4 en logic enable 5 ? thref cell temperature sensor bias 6 ? therm cell temperature sensor input 75timertimer set 86v ss battery management 0v reference 97v bat battery voltage sense 10 8 drv drive output
? 2004 microchip technology inc. ds21823b-page 11 mcp73841/2/3/4 4.0 device overview the mcp7384x family of devices are highly advanced, linear charge management controllers. figure 4-1 depicts the operational flow algorithm from charge initiation to completion and automatic recharge. 4.1 charge qualification and preconditioning upon insertion of a battery or application of an external supply, the mcp7384x family of devices automatically perform a series of safety checks to qualify the charge. the input source voltage must be above the undervoltage lockout threshold, the enable pin must be above the logic-high level and the cell temperature monitor must be within the upper and lower thresholds. the cell temperature monitor applies to both the mcp73841 and MCP73842, with the qualification parameters being continuously monitored. deviation beyond the limits automatically suspends or terminates the charge cycle. once the qualification parameters have been met, the mcp7384x initiates a charge cycle. the charge status output is pulled low throughout the charge cycle (see table 5-1 for charge status outputs). if the battery voltage is below the preconditioning threshold (v pth ), the mcp7384x preconditions the battery with a trickle- charge. the preconditioning current is set to approximately 10% of the fast charge regulation current. the preconditioning trickle-charge safely replenishes deeply depleted cells and minimizes heat dissipation in the external pass transistor during the initial charge cycle. if the battery voltage has not exceeded the preconditioning threshold before the preconditioning timer has expired, a fault is indicated and the charge cycle is terminated. 4.2 constant-current regulation ? fast charge preconditioning ends and fast charging begins, when the battery voltage exceeds the preconditioning threshold. fast charge regulates to a constant-current, i reg , based on the supply voltage minus the voltage at the sense input (v fcs ) developed by the drop across an external sense resistor (r sense ). fast charge continues until the battery voltage reaches the regulation voltage (v reg ); or until the fast charge timer expires. in this case, a fault is indicated and the charge cycle is terminated. 4.3 constant-voltage regulation when the battery voltage reaches the regulation voltage (v reg ), constant-voltage regulation begins. the mcp7384x monitors the battery voltage at the v bat pin. this input is tied directly to the positive terminal of the battery. the mcp7384x is offered in four fixed-voltage versions for single or dual series cell battery packs with either coke or graphite anodes: - 4.1v (mcp73841-4.1, mcp73843-4.1) - 4.2v (mcp73841-4.2, mcp73843-4.2) - 8.2v (MCP73842-8.2, mcp73844-8.2) - 8.4v (MCP73842-8.4, mcp73844-8.4) 4.4 charge cycle completion and automatic re-charge the mcp7384x monitors the charging current during the constant-voltage regulation phase. the charge cycle is considered complete when the charge current has diminished below approximately 7% of the regulation current (i reg ) or the elapsed timer has expired. the mcp7384x automatically begins a new charge cycle when the battery voltage falls below the recharge threshold (v rth ), assuming all the qualification parameters are met.
? 2004 microchip technology inc. ds21823b-page 12 mcp73841/2/3/4 figure 4-1: operational flow algorithm - mcp73841 and MCP73842. preconditioning phase charge current = i preg reset safety timer yes initialize no yes v bat > v pth stat1 = on v bat > v pth yes v dd < v uvlo no no safety timer ye s temperature ok no stat1 = flashing safety timer suspended charge current = 0 fault charge current = 0 reset safety timer or en low no stat1 = flashing constant-current charge current = i reg reset safety timer v bat = v reg no no safety timer ye s temperature ok constant-voltage phase output voltage = v reg i out < i term ye s v bat < v rth elapsed timer charge termination charge current = 0 reset safety timer no stat1 = off yes yes temperature ok no stat1 = flashing safety timer suspended charge current = 0 ye s yes v dd < v uvlo or en low no yes ye s temperature ok no stat1 = flashing charge current = 0 ye s no stat1 = off v dd > v uvlo phase expired expired no stat1 = flashing safety timer suspended charge current = 0 en high expired note: the qualification parameters are continuously monitored throughout the charge cycle. note note
? 2004 microchip technology inc. ds21823b-page 13 mcp73841/2/3/4 5.0 detailed description 5.1 analog circuitry 5.1.1 charge current sense input (sense) fast charge current regulation is maintained by the voltage drop developed across an external sense resistor (r sense ) applied to the sense input pin. the following formula calculates the value for r sense : the preconditioning trickle-charge current and the charge termination current are scaled to approximately 10% and 7% of i reg , respectively. 5.1.2 battery management input supply (v dd ) the v dd input is the input supply to the mcp7384x. the mcp7384x automatically enters a power-down mode if the voltage on the v dd input falls below the undervoltage lockout voltage (v stop ). this feature prevents draining the battery pack when the v dd supply is not present. 5.1.3 cell temperature sensor bias (thref) a 2.55v voltage reference is provided to bias an external thermistor for continuous cell temperature monitoring and pre-qualification. a ratio metric window comparison is performed at threshold levels of v thref /2 and v thref /4. cell temperature monitoring is provided by both the mcp73841 and MCP73842. 5.1.4 cell temperature sensor input (therm) the mcp73841 and MCP73842 continuously monitor temperature by comparing the voltage between the therm input and v ss with the upper and lower temperature thresholds. a negative or positive temperature coefficient (ntc or ptc) thermistor and an external voltage divider typically develop this voltage. the temperature-sensing circuit has its own reference, to which it performs a ratio metric comparison. therefore, it is immune to fluctuations in the supply input (v dd ). the temperature-sensing circuit is removed from the system when v dd is not applied, eliminating additional discharge of the battery pack. figure 6-1 depicts a typical application circuit with connection of the therm input. the resistor values of r t1 and r t2 are calculated with the following equations. for ntc thermistors: for ptc thermistors: applying a voltage equal to 0.85v to the therm input disables temperature monitoring. 5.1.5 timer set input (timer) the timer input programs the period of the safety timers by placing a timing capacitor (c timer ) between the timer input pin and v ss . three safety timers are programmed via the timing capacitor. the preconditioning safety timer period: the fast charge safety timer period: the elapsed time termination period: the preconditioning timer starts after qualification and resets when the charge cycle transitions to the con- stant-current, fast charge phase. the fast charge and elapsed timers start once the mcp7384x transitions from preconditioning. the fast charge timer resets when the charge cycle transitions to the constant-volt- age phase. the elapsed timer will expire and terminate the charge if the sensed current does not diminish below the termination threshold. r sense v fcs i reg ------------ = where: i reg is the desired fast charge current in amps r t 1 2 r cold r hot r cold r hot ? ---------------------------------------------- = r t 2 2 r cold r hot r cold 3 r hot ? ---------------------------------------------- = r t 1 2 r cold r hot r hot r cold ? ---------------------------------------------- = r t 2 2 r cold r hot r hot 3 r cold ? ---------------------------------------------- = where: values at the temperature window of interest. r cold and r hot are the thermistor resistance t precon c timer 0.1 f ------------------ -1.0 hour s = t fast c timer 0.1 f ------------------ -1.5 hours = t term c timer 0.1 f ------------------ -3.0 hours =
mcp73841/2/3/4 ds21823b-page 14 ? 2004 microchip technology inc. 5.1.6 battery voltage sense (v bat ) the mcp7384x monitors the battery voltage at the v bat pin. this input is tied directly to the positive terminal of the battery. the mcp7384x is offered in four fixed-voltage versions for single or dual series cell battery packs, with either coke or graphite anodes: - 4.1v (mcp73841-4.1, mcp73843-4.1) - 4.2v (mcp73841-4.2, mcp73843-4.2) - 8.2v (MCP73842-8.2, mcp73844-8.2) - 8.4v (MCP73842-8.4, mcp73844-8.4) 5.1.7 drive output (drv) the mcp7384x controls the gate drive to an external p-channel mosfet. the p-channel mosfet is controlled in the linear region regulating current and voltage supplied to the cell. the drive output is automatically turned off when the voltage on the v dd input falls below the undervoltage lockout voltage (v stop ). 5.2 digital circuitry 5.2.1 charge status output (stat1) a status output provides information on the state-of- charge. the current-limited, open-drain output can be used to illuminate an external led. optionally, a pull-up resistor can be used on the output for communication with a host microcontroller. table 5-1 summarizes the state of the status output during a charge cycle. table 5-1: status outputs the flashing rate (1 hz) is based off a timer capacitor (c timer ) of 0.1 f. the rate will vary based on the value of the timer capacitor. 5.2.2 logic enable (en) the logic-enable input pin (en) can be used to terminate a charge anytime during the charge cycle, initiate a charge cycle or initiate a recharge cycle. applying a logic-high input signal to the en pin, or tying it to the input source, enables the device. applying a logic-low input signal disables the device and terminates a charge cycle. when disabled, the device?s supply current is reduced to 0.25 a, typically. charge cycle state stat1 qualification off preconditioning on constant-current fast charge on constant-voltage on charge complete off safety timer fault flashing (1 hz, 50% duty cycle) cell temperature invalid flashing (1 hz, 50% duty cycle) disabled - sleep mode off battery disconnected off
? 2004 microchip technology inc. ds21823b-page 15 mcp73841/2/3/4 6.0 applications the mcp7384x is designed to operate in conjunction with either a host microcontroller or in stand-alone applications. the mcp7384x provides the preferred charge algorithm for lithium-ion and lithium-polymer cells: constant-current followed by constant-voltage. figure 6-1 depicts a typical stand-alone application circuit, while figure 6-2 depicts the accompanying charge profile. figure 6-1: typical application circuit. figure 6-2: typical charge profile. v dd v ss v bat drv therm en sense 1 2 3 4 10 9 8 7 mcp73841 timer 5 6 stat1 voltage + - battery pack r sense c timer optional thref r t1 r t2 q 1 reverse blocking diode regulated wall cube regulation voltage (v reg ) regulation current (i reg ) transition threshold (v pth ) precondition current (i preg ) precondition safety timer fast charge safety timer elapsed time termination timer charge current charge voltage preconditioning phase constant-current phase constant-voltage phase termination current (i term )
mcp73841/2/3/4 ds21823b-page 16 ? 2004 microchip technology inc. 6.1 application circuit design due to the low efficiency of linear charging, the most important factors are thermal design and cost, which are a direct function of the input voltage, output current and thermal impedance between the external p-channel pass transistor and the ambient cooling air. the worst- case situation occurs when the device has transitioned from the preconditioning phase to the constant-current phase. in this situation, the p-channel pass transistor has to dissipate the maximum power. a trade-off must be made between the charge current, cost and thermal requirements of the charger. 6.1.1 component selection selection of the external components in figure 6-1 are crucial to the integrity and reliability of the charging system. the following discussion is intended to be a guide for the component selection process. 6.1.1.1 sense resistor the preferred fast charge current for lithium-ion cells is at the 1c rate, with an absolute maximum current at the 2c rate. for example, a 500 mah battery pack has a preferred fast charge current of 500 ma. charging at this rate provides the shortest charge cycle times without degradation to the battery pack performance or life. the current sense resistor (r sense ) is calculated by: for the 500 mah battery pack example, a standard value 220 m ? , 1% resistor provides a typical fast charge current of 500 ma and a maximum fast charge current of 551 ma. worst-case power dissipation in the sense resistor is: a panasonic ? erj-6rqfr22v, 220 mw, 1%, 1/8w resistor in a standard 0805 package is more than sufficient for this application. a larger value sense resistor will decrease the fast charge current and power dissipation in both the sense resistor and external pass transistor, but will increase charge cycle times. design trade-offs must be considered to minimize space while maintaining the desired performance. 6.1.1.2 external pass transistor the external p-channel mosfet is determined by the gate-to-source threshold voltage, input voltage, output voltage and fast charge current. therefore, the selected p-channel mosfet must satisfy the thermal and electrical design requirements. thermal considerations the worst-case power dissipation in the external pass transistor occurs when the input voltage is at the maximum and the device has transitioned from the preconditioning phase to the constant-current phase. in this case, the power dissipation is: power dissipation with a 5v, 10% input voltage source, 220 m ? , 1% sense resistor is: utilizing a fairchild? nds8434 or an international rectifier irf7404 mounted on a 1in 2 pad of 2 oz. copper, the junction temperature rise is 75c, approximately. this would allow for a maximum operating ambient temperature of 75c. by increasing the size of the copper pad, a higher ambient temperature can be realized, or a lower value sense resistor could be utilized. alternatively, different package options can be utilized for more or less power dissipation. again, design trade- offs should be considered to minimize size while maintaining the desired performance. electrical considerations the gate-to-source threshold voltage and r dson of the external p-channel mosfet must be considered in the design phase. the worst-case v gs provided by the controller occurs when the input voltage is at the minimum and the fast charge current regulation threshold is at the maximum. the worst-case v gs is: r sense v fcs i reg ------------ = where: i reg is the desired fast charge current. powerdissipation 220 m ? 551 ma 2 66.8 mw == powerdissipation v ddmax v pthmin ? () i regmax = where: v ddmax is the maximum input voltage. i regmax is the maximum fast charge current. v pthmin is the minimum transition threshold voltage. powerdissipation 5.5 v 2.75 v ? () 551 ma 1.52 w == v gs v drvmax v ddmin v fcsmax ) ? ( ? = where: v drvmax is the maximum sink voltage at the v drv output v ddmin is the minimum input voltage source v fcsmax is the maximum fast charge current regulation threshold
? 2004 microchip technology inc. ds21823b-page 17 mcp73841/2/3/4 worst-case v gs with a 5v, 10% input voltage source and a maximum sink voltage of 1.0v is: at this worst-case (v gs ) the r dson of the mosfet must be low enough as to not impede the performance of the charging system. the maximum allowable r dson at the worst-case v gs is: the fairchild nds8434 and international rectifier irf7404 both satisfy these requirements. 6.1.1.3 external capacitors the mcp7384x are stable with or without a battery load. in order to maintain good ac stability in the constant-voltage mode, a minimum capacitance of 4.7 f is recommended to bypass the v bat pin to v ss . this capacitance provides compensation when there is no battery load. additionally, the battery and interconnections appear inductive at high frequencies. these elements are in the control feedback loop during constant-voltage mode. therefore, the bypass capacitance may be necessary to compensate for the inductive nature of the battery pack. virtually any good quality output filter capacitor can be used, independent of the capacitor?s minimum esr (effective series resistance) value. the actual value of the capacitor and its associated esr depends on the forward transconductance (g m ) and capacitance of the external pass transistor. a 4.7 f tantalum or aluminum electrolytic capacitor at the output is usually sufficient to ensure stability for up to a 1a output current. 6.1.1.4 reverse-blocking protection the optional reverse-blocking protection diode, depicted in figure 6-1, provides protection from a faulted or shorted input, or from a reversed-polarity input source. without the protection diode, a faulted or shorted input would discharge the battery pack through the body diode of the external pass transistor. if a reverse-protection diode is incorporated into the design, it should be chosen to handle the fast charge current continuously at the maximum ambient temperature. in addition, the reverse-leakage current of the diode should be kept as small as possible. 6.1.1.5 enable interface in the stand-alone configuration, the enable pin is generally tied to the input voltage. the mcp7384x automatically enters a low-power mode when voltage on the v dd input falls below the undervoltage lockout voltage (v stop ), reducing the battery drain current to 0.4 a, typically. 6.1.1.6 charge status interface a status output provides information on the state of charge. the current-limited, open-drain output can be used to illuminate an external led. refer to table 5-1 for a summary of the state of the status output during a charge cycle. 6.2 pcb layout issues for optimum voltage regulation, place the battery pack as close as possible to the device?s v bat and v ss pins. this is recommended to minimize voltage drops along the high current-carrying pcb traces. if the pcb layout is used as a heatsink, adding many vias around the external pass transistor can help conduct more heat to the back plane of the pcb, thus reducing the maximum junction temperature. v gs 1.0 v 4.5 v 120 mv ? () ?3.38 v ? == r dson v ddmin v fcsmax ? v batmax ? i regmax ------------------------------------------------------------------------------- = r dson 4.5 v 120 115 () mv ? 4.221 v ? 551 581 () ma ------------------------------------------------------------------------ - 288 m ? ==
mcp73841/2/3/4 ds21823b-page 18 ? 2004 microchip technology inc. 7.0 packaging information 7.1 package marking information legend: xx...x customer specific information* yy year code (last 2 digits of calendar year) ww week code (week of january 1 is week ?01?) nnn alphanumeric traceability code note : in the event the full microchip part number cannot be marked on one line, it will be carried over to the next line thus limiting the number of available characters for customer specific information. * standard marking consists of microchip part number, year code, week code, and traceab ility code. 8-lead msop ( mcp73843, mcp73844 ) example: xxxxx ywwnnn 738431 0319256 10-lead msop ( mcp73841, MCP73842 ) example: xxxxx yywwnnn 738411 0319256
? 2004 microchip technology inc. ds21823b-page 19 mcp73841/2/3/4 8-lead plastic micro small outline package (ms) (msop) d a a1 l c (f) a2 e1 e p b n 1 2 dimensions d and e1 do not include mold flash or protrusions. mold flash or protrusions shall not .037 ref f footprint (reference) exceed .010" (0.254mm) per side. notes: drawing no. c04-111 *controlling parameter mold draft angle top mold draft angle bottom foot angle lead width lead thickness c b .003 .009 .006 .012 dimension limits overall height molded package thickness molded package width overall length foot length standoff overall width number of pins pitch a l e1 d a1 e a2 .016 .024 .118 bsc .118 bsc .000 .030 .193 typ. .033 min p n units .026 bsc nom 8 inches 0.95 ref - - .009 .016 0.08 0.22 0 0.23 0.40 8 millimeters* 0.65 bsc 0.85 3.00 bsc 3.00 bsc 0.60 4.90 bsc .043 .031 .037 .006 0.40 0.00 0.75 min max nom 1.10 0.80 0.15 0.95 max 8 -- - 15 5 - 15 5 - jedec equivalent: mo-187 0 - 8 5 5 - - 15 15 - - - -
mcp73841/2/3/4 ds21823b-page 20 ? 2004 microchip technology inc. 10-lead plastic micro small outline package (un) (msop) dimensions d and e1 do not include mold flash or protrusions. mold flash or protrusions shall not .037 ref f footprint exceed .010" (0.254mm) per side. notes: drawing no. c04-021 *controlling parameter mold draft angle top mold draft angle bottom foot angle lead width lead thickness c b .003 .006 - .009 dimension limits overall height molded package thickness molded package width overall length foot length standoff overall width number of pins pitch a l e1 d a1 e a2 .016 .024 .118 bsc .118 bsc .000 .030 .193 bsc .033 min p n units .020 typ nom 10 inches 0.95 ref - 0.23 .009 .012 0.08 0.15 - - 0.23 0.30 millimeters* 0.50 typ. 0.85 3.00 bsc 3.00 bsc 0.60 4.90 bsc .043 .031 .037 .006 0.40 0.00 0.75 min max nom 1.10 0.80 0.15 0.95 max 10 5 15 5 15 - -- 0 - 8 5 - 5 - 15 15 jedec equivalent: mo-187 8 0 e l d (f) b p e1 n a2 1 2 c a1 a l1 - - --
? 2004 microchip technology inc. ds21823b-page 21 mcp73841/2/3/4 product identification system to order or obtain information, e.g., on pricing or delivery, refer to the factory or the listed sales office . sales and support device mcp73841: single-cell charge controller with temperature monitor mcp73841t: single-cell charge controller with temperature monitor, tape and reel MCP73842: dual series cells charge controller with tem- perature monitor MCP73842t: dual series cells charge controller with tem- perature monitor, tape and reel mcp73843: single-cell charge controller mcp73843t: single-cell charge controller, tape and reel mcp73844: dual series cells charge controller mcp73844t: dual series cells charge controller, tape and reel preset voltage regulation options 410 = 4.1v 420 = 4.2v 820 = 8.2v 840 = 8.4v temperature range i = -40 c to +85 c (industrial) package ms = plastic micro small outline (msop), 8-lead un = plastic micro small outline (msop), 10-lead part no. x xx package temperature range device xxx preset voltage options examples: a) mcp73841-410i/un: 4.1v preset voltage b) mcp73841t-410i/un: 4.1v preset voltage, tape and reel c) mcp73841-420i/un: 4.2v preset voltage d) mcp73841t-420i/un: 4.2v preset voltage, tape and reel a) MCP73842-820i/un: 8.2v preset voltage b) MCP73842t-820i/un: 8.2v preset voltage, tape and reel c) MCP73842-840i/un: 8.4v preset voltage d) MCP73842t-840i/un: 8.4v preset voltage, tape and reel a) mcp73843-410i/ms: 4.1v preset voltage b) mcp73843t-410i/ms: 4.1v preset voltage, tape and reel c) mcp73843-420i/ms: 4.2v preset voltage d) mcp73843t-420i/ms: 4.2v preset voltage, tape and reel a) mcp73844-820i/ms: 8.2v preset voltage b) mcp73844t-820i/ms: 8.2v preset voltage, tape and reel c) mcp73844-840i/ms: 8.4v preset voltage d) mcp73844t-840i/ms: 8.4v preset voltage, tape and reel data sheets products supported by a preliminary data sheet may have an errata sheet describing minor operational differences and recommended workarounds. to determine if an errata sheet exists for a particular device, please contact one of the following: 1. your local microchip sales office 2. the microchip corporate literature center u.s. fax: (480) 792-7277 3. the microchip worldwide site (www.microchip.com) please specify which device, revision of silicon and data sheet (include literature #) you are using. customer notification system register on our web site (www.microchip.com/cn) to receive the most current information on our products.
mcp73841/2/3/4 ds21823b-page 22 ? 2004 microchip technology inc. notes:
? 2004 microchip technology inc. ds21823b-page 23 information contained in this publication regarding device applications and the like is intended through suggestion only and may be superseded by updates. it is your responsibility to ensure that your application meets with your specifications. no representation or warranty is given and no liability is assumed by microchip technology incorporated with respect to the accuracy or use of such information, or infringement of patents or other intellectual property rights arising from such use or otherwise. use of microchip?s products as critical components in life support systems is not authorized except with express written approval by microchip. no licenses are conveyed, implicitly or otherwise, under any intellectual property rights. trademarks the microchip name and logo, the microchip logo, accuron, dspic, k ee l oq , mplab, pic, picmicro, picstart, pro mate, powersmart and rfpic are registered trademarks of microchip technology incorporated in the u.s.a. and other countries. amplab, filterlab, micro id , mxdev, mxlab, picmaster, seeval, smartshunt and the embedded control solutions company are registered trademarks of microchip technology incorporated in the u.s.a. application maestro, dspicdem, dspicdem.net, dspicworks, ecan, economonitor, fansense, flexrom, fuzzylab, in-circuit serial programming, icsp, icepic, migratable memory, mpasm, mplib, mplink, mpsim, pickit, picdem, picdem.net, pictail, powercal, powerinfo, powermate, powertool, rflab, select mode, smartsensor, smarttel and total endurance are trademarks of microchip technology incorporated in the u.s.a. and other countries. serialized quick turn programming (sqtp) is a service mark of microchip technology incorporated in the u.s.a. all other trademarks mentioned herein are property of their respective companies. ? 2004, microchip technology incorporated, printed in the u.s.a., all rights reserved. printed on recycled paper. note the following details of the code protection feature on microchip devices: ? microchip products meet the specification contained in their particular microchip data sheet. ? microchip believes that its family of products is one of the most secure families of its kind on the market today, when used i n the intended manner and under normal conditions. ? there are dishonest and possibly illegal methods used to breach the code protection feature. all of these methods, to our knowledge, require using the microchip products in a manner outside the operating specifications contained in microchip's data sheets. most likely, the person doing so is engaged in theft of intellectual property. ? microchip is willing to work with the customer who is concerned about the integrity of their code. ? neither microchip nor any other semiconductor manufacturer can guarantee the security of their code. code protection does not mean that we are guaranteeing the product as ?unbreakable.? code protection is constantly evolving. we at microchip are committed to continuously improving the code protection features of our products. attempts to break microchip?s code protection feature may be a violation of the digital millennium copyright act. if such acts allow unauthorized access to your software or other copyrighted work, you may have a right to sue for relief under that act. microchip received iso/ts-16949:2002 quality system certification for its worldwide headquarters, design and wafer fabrication facilities in chandler and tempe, arizona and mountain view, california in october 2003. the company?s quality system processes and procedures are for its picmicro ? 8-bit mcus, k ee l oq ? code hopping devices, serial eeproms, microperipherals, nonvolatile memory and analog products. in addition, microchip?s quality system for the design and manufacture of development systems is iso 9001:2000 certified.
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