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general description the max1501 intelligent, constant-current, constant- voltage (cccv), temperature-regulated battery charger charges a single lithium-ion (li+) cell or three-cell nimh/nicd batteries. the device integrates the current- sense resistor, pmos pass element, and thermal- regulation circuitry, while eliminating the reverse- blocking schottky diode to create the simplest charging solution for hand-held equipment. the max1501 functions as a stand-alone charger to control the charging sequence from the prequalification state through fast charge, top-off, and charge termination for single-cell li+ or three-cell nimh/nicd batteries. alternatively, the max1501 collaborates with a host microprocessor to determine the best charging algorithm. proprietary thermal-regulation circuitry limits the die temperature when fast charging or while exposed to high ambient temperatures, allowing maximum charging current without damaging the charger. the max1501 continually supplies a regulated output voltage under no-battery conditions, allowing battery changing. the device achieves high flexibility by providing an adjustable fast-charge current, top-off current, safety timer (disabled in the max1501z), and thermal-regula- tion setpoint. other features include input power detec- tion ( acok ) and input under- /overvoltage protection. the max1501 provides active-low control inputs. the max1501 accepts a 4.5v to 13v supply, but disables charging when the input voltage exceeds 6.5v, preventing excessive power dissipation. the max1501 operates over the extended temperature range (-40? to +85?) and is available in a compact 16-pin thermally enhanced 5mm x 5mm thin qfn package with 0.8mm profile. applications cellular and cordless phones pdas digital cameras and mp3 players usb appliances charging cradles and docks bluetooth equipment features ? stand-alone or microprocessor-controlled (?) linear 1-cell li+ or 3-cell nimh/nicd battery charger ? no fet, reverse-blocking diode, or current- sense resistor required ? 1.4a (max) programmable fast-charge current ? +95?, +115?, and +135? proprietary programmable die temperature regulation control ? 4.5v to 13v input voltage range with input overvoltage (ovlo) protection above 6.5v ? programmable top-off current threshold: 10%, 20%, or 30% of the fast-charge current ? charge-current monitor for fuel gauging ? programmable safety timer (3, 4.5, or 6 hours) ? input power detection output ( acok ) and charge enable input ( chgen ) ? automatic recharge ? digital soft-start limits inrush current ? charge status outputs for leds or ? interface max1501 highly integrated, linear battery charger with thermal regulation for portable applications ________________________________________________________________ maxim integrated products 1 ordering information 19-2800; rev 1; 3/04 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. part temp range pin-package max1501ete -40? to +85? 16 thin qfn MAX1501ZETE -40? to +85? 16 thin qfn pin configuration appears at end of data sheet. max1501/max1501z 1 f input 4.5v to 13v 2.8k ? in inp temp tmax/i.c. seti gnd gled rled 10 f 4.2v 1-cell li+ r pullup v logic ( 5.5v) batt fulli vl selv mode chgen acok t ypical operating circuit bluetooth is a trademark of ericsson.
max1501 highly integrated, linear battery charger with thermal regulation for portable applications 2 _______________________________________________________________________________________ absolute maximum ratings electrical characteristics (v in = v inp = 5v, v batt = 3.5v, acok = gled = rled = temp = tmax/i.c. = fulli = open, chgen = mode = gnd, r seti = 2.8k ? , c in = 1?, c batt = 10?, t a = 0? to +85? , unless otherwise noted. typical values are at t a = +25 c.) 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. in, inp, rled , gled to gnd ................................-0.3v to +14v in to inp ................................................................-0.3v to +0.3v vl, batt, seti, acok , mode , chgen , selv, fulli, tmax/i.c., temp to gnd .........................-0.3v to +6v vl to in...................................................................-14v to +0.3v continuous power dissipation (t a = +70 c) 16-pin 5mm ? 5mm thin qfn (derate 21.3mw/ c above +70 c) .............................1702mw 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 conditions min typ max units in, inp input voltage 013v in, inp input operating range 4.50 6.25 v vl output voltage 4.5v v in 6.25v, i vl < 250? 2.7 3 3.3 v v in - v batt , rising 40 70 100 v in - v batt , falling 30 55 85 acok trip point v in - v batt , hysteresis 15 mv acok sink current 4.5v v in 6.25v, v acok = 0.6v 75 ? v in rising 4.05 4.125 4.20 v in falling 3.9 4.025 4.1 v undervoltage lockout trip point hysteresis 100 mv overvoltage lockout trip point v in rising 6.25 6.50 6.75 v li+, nimh/nicd, and no-battery modes 5 8 disable mode 1.5 3 in input current off mode (v in = 4v) 0.25 ma v batt = 4.3v 45 80 v in = 0 3 10 batt input current disable mode 2 6 ? leakage into battery v in = v inp = 13v, v batt = 0 disable mode 5 a rms charge current 1.4 a selv = vl 4.166 4.2 4.234 li+ mode selv = gnd 4.067 4.1 4.133 selv = vl, v in = v inp = 6v 4.85 4.95 5.05 battery regulation voltage nimh/nicd mode selv = gnd 4.4 4.5 4.6 v output regulation voltage no-battery mode 3.700 4.0 4.234 v batt precharge threshold voltage batt rising 2.675 2.8 2.925 v r seti = 2.8k ? 460 500 540 fast-charge current-loop system accuracy r seti = 1.75 k ? 736 800 864 ma
max1501 highly integrated, linear battery charger with thermal regulation for portable applications _______________________________________________________________________________________ 3 electrical characteristics (continued) (v in = v inp = 5v, v batt = 3.5v, acok = gled = rled = temp = tmax/i.c. = fulli = open, chgen = mode = gnd, r seti = 2.8k ? , c in = 1?, c batt = 10?, t a = 0? to +85? , unless otherwise noted. typical values are at t a = +25 c.) parameter conditions min typ max units precharge current system accuracy % of fast-charge current, v batt = 2v 5 10 15 % temp = gnd 95 temp = open 115 die temperature regulation setpoint (note 1) temp = vl 135 o c i batt to i seti , precharge mode, v batt = 2v 0.70 1 1.30 current-sense amplifier gain i batt to i seti , fast-charge mode 0.95 1 1.05 ma/a internal current-sense resistance 84 m ? regulator dropout voltage v in - v batt , nimh/nicd mode, v batt = 4.3v, i batt = 425ma 190 350 mv logic input low voltage chgen , mode , 4.5v v in 6.25v 0.52 v logic input high voltage chgen , mode , 4.5v v in 6.25v 1.25 v internal pulldown resistance chgen , mode 100 175 400 k ? internal pullup resistance selv 100 175 400 k ? internal bias resistance fulli, temp, tmax 50 90 200 k ? internal bias voltage fulli, temp, tmax v vl /2 v rled output low current v rled = 1v 7 10 18 ma gled output low current v gled = 1v 14 20 34 ma gled , rled output high leakage current v gled = v rled = v in = v inp = 13v 0.1 1 a fulli = gnd 5 10 15 fulli = vl 15 20 25 full-battery detection current threshold % of fast-charge current fulli = open 25 30 35 % selv = vl 3.9 4.0 4.1 li+ mode selv = gnd 3.8 3.9 4.0 v batt restart threshold nimh/nicd mode 3.9 4.0 4.1 v charge-timer accuracy -10 +10 % tmax = gnd 3 tmax = open 4.5 charge-timer duration (max1501 only) tmax = vl 6 hrs
max1501 highly integrated, linear battery charger with thermal regulation for portable applications 4 _______________________________________________________________________________________ electrical characteristics (v in = v inp = 5v, v batt = 3.5v, acok = gled = rled = temp = tmax/i.c. = fulli = open, chgen = mode = gnd, r seti = 2.8k ? , c in = 1?, c batt = 10?, t a = -40? to +85? , unless otherwise noted. typical values are at t a = +25 c.) (note 2) parameter conditions min typ max units in, inp input voltage 013v in, inp input operating range 4.50 6.25 v vl output voltage 4.5v v in 6.25v, i vl < 250? 2.7 3.3 v v in - v batt , rising 40 100 acok trip point v in - v batt , falling 30 85 mv acok sink current 4.5v v in 6.25v, v acok = 0.6v 75 ? v in rising 4.00 4.25 undervoltage lockout trip point v in falling 3.90 4.15 v overvoltage lockout trip point 6.25 6.75 v li+, nimh/nicd, and no-battery modes 8 in input current disable mode 3 ma v batt = 4.3v 80 v in = 0 10 batt input current disable mode 6 ? leakage into battery v in = v inp = 13v, v batt = 0 disable mode 5 a rms charge current 1.4 a selv = vl 4.148 4.252 li+ mode selv = gnd 4.05 4.15 selv = vl 4.85 5.05 battery regulation voltage nimh/nicd mode selv = gnd 4.4 4.6 v output regulation voltage no-battery mode 3.700 4.234 v batt precharge threshold voltage batt rising 2.675 2.925 v r seti = 2.8k ? 460 540 fast-charge current-loop system accuracy r seti = 1.75k ? 736 864 ma precharge current system accuracy % of fast-charge current, v batt = 2v 5 15 % i batt to i seti , precharge mode, v batt = 2v 0.60 1.40 current-sense amplifier gain i batt to i seti , fast-charge mode 0.93 1.07 ma/a regulator dropout voltage v in - v batt , nimh/nicd mode, v batt = 4.3v, i batt = 425ma 350 mv logic input low voltage chgen , mode , 4.5v < v in < 6.25v 0.52 v logic input high voltage chgen , mode , 4.5v < v in < 6.25v 1.3 v internal pulldown resistance chgen , mode 100 400 k ? internal pullup resistance selv 100 400 k ? internal bias resistance fulli, temp, tmax 50 200 k ?
max1501 highly integrated, linear battery charger with thermal regulation for portable applications _______________________________________________________________________________________ 5 note 1: temperature regulation setpoint variation is typically ??. note 2: specifications to t a = -40? are guaranteed by design, not production tested. electrical characteristics (continued) (v in = v inp = 5v, v batt = 3.5v, acok = gled = rled = temp = tmax/i.c. = fulli = open, chgen = mode = gnd, r seti = 2.8k ? , c in = 1?, c batt = 10?, t a = -40? to +85? , unless otherwise noted. typical values are at t a = +25 c.) (note 2) parameter conditions min typ max units rled output low current v rled = 1v 7 18 ma gled output low current v gled = 1v 14 34 ma gled , rled output high leakage current v gled = v rled = v in = v inp = 13v 1 a charge-timer accuracy (max1501 only) -10 +10 % t ypical operating characteristics (v in = v inp = 5v, acok = rled = gled = temp = tmax/i.c. = fulli = open, c batt = 10?, c in = 1?, t a = +25 c, unless otherwise noted.) supply current vs. input voltage max1501 toc01 input voltage (v) supply current (ma) 12 11 9 10 3 4 5 6 7 8 1 2 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 0 013 li+ mode or nimh/nicd mode, selv = vl, i batt = 0 disable-mode supply current vs. input voltage max1501 toc02 input voltage (v) disable-mode supply current (ma) 12 11 9 10 3 4 5 6 7 8 1 2 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 0 013 charge current vs. battery voltage max1501 toc03 battery voltage (v) charge current (ma) 4.0 3.5 2.5 3.0 1.0 1.5 2.0 0.5 50 100 150 200 250 300 350 400 450 500 550 600 0 04.5 li+ mode, r seti = 2.7k ? , v in = 5v, selv = vl charge current vs. battery voltage max1501 toc04 battery voltage (v) charge current (ma) 4.5 4.0 3.0 3.5 1.0 1.5 2.0 2.5 0.5 50 100 150 200 250 300 350 400 450 500 550 600 0 05.0 nimh/nicd, r seti = 2.7k ? , v in = 5.5v, selv = vl charge current vs. input voltage max1501 toc05 input voltage (v) charge current (ma) 12 11 9 10 3 4 5 6 7 8 1 2 50 100 150 200 250 300 350 400 450 500 550 600 0 013 li+ mode, selv = vl, r seti = 2.7k ? charge current vs. input-voltage headroom max1501 toc06 v in - v batt (v) charge current (ma) 1.8 1.6 1.2 1.4 0.4 0.6 0.8 1.0 0.2 50 100 150 200 250 300 350 400 450 500 550 600 0 02.0 nimh/nicd mode, selv = gnd, r seti = 2.7k ? , v batt = 4.3v
max1501 highly integrated, linear battery charger with thermal regulation for portable applications 6 _______________________________________________________________________________________ t ypical operating characteristics (continued) (v in = v inp = 5v, acok = rled = gled = temp = tmax/i.c. = fulli = open, c batt = 10?, c in = 1?, t a = +25 c, unless otherwise noted.) output voltage vs. input voltage max1501 toc07 input voltage (v) output voltage (v) 12 11 1 2 3 5 6 7 8 9 4 10 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 0 013 no battery mode i batt = 0 4.08 4.12 4.10 4.16 4.14 4.20 4.18 4.22 -40 10 -15 35 60 85 battery regulation voltage vs. temperature max1501 toc08 temperature ( c) battery regulation voltage (v) li+ mode selv = vl selv = gnd charge current vs. ambient temperature max1501 toc09 ambient temperature ( c) charge current (ma) 60 35 10 -15 420 440 460 480 500 520 540 560 580 600 400 -40 85 li+ mode, temp = vl, v batt = 3.6v, v in = 5v, r seti = 2.7k ? charge current vs. ambient temperature max1501 toc10 ambient temperature ( c) charge current (ma) 60 35 10 -15 100 200 300 400 500 600 700 800 900 1000 0 -40 85 li+ mode, temp = vl, v batt = 3.6v, v in = 6v, r seti = 1.75k ?
max1501 highly integrated, linear battery charger with thermal regulation for portable applications _______________________________________________________________________________________ 7 pin description pin name function 1 inp high-current charger input. connect an ac adapter to inp and in as close to the device as possible. inp provides charge current to the battery. inp draws current while the device is in shutdown mode. 2in low-current charger input. bypass in to gnd with a 1? ceramic capacitor. connect in to inp as close to the device as possible. in powers the internal ldo and reference. in draws current while the device is in shutdown mode. 3, 13 gnd ground. connect the exposed paddle to gnd. 4 seti current-sense transconductance amplifier output. connect a resistor from seti to gnd to program the maximum charge current and to monitor the actual charge current. seti pulls to gnd during shutdown. 5vl linear regulator output. connect chgen , temp, tmax, fulli, and mode to vl to program logic high. vl discharges to gnd during shutdown. tmax maximum charging-time select input (max1501 only). tmax sets the maximum charging time. connect tmax to gnd to set the maximum charging time to 3 hours. leave tmax floating to set the maximum charging time to 4.5 hours. connect tmax to vl to set the maximum charging time to 6 hours. tmax pulls to gnd through a 50k ? resistor in shutdown. 6 i.c. internally connected in the max1501z. leave floating. 7 fulli top-off-current select input. fulli sets the end-of-charge threshold as a percentage of the fast-charge current. connect fulli to gnd to set the end-of-charge threshold to 10% of the fast-charge current. connect fulli to vl to set the end-of-charge threshold to 20% of the fast-charge current. leave fulli floating to set the end-of-charge threshold to 30% of the fast-charge current. fulli pulls to gnd through a 50k ? resistor in shutdown. 8 temp die temperature select input. temp sets the die temperature regulation point for the thermal-control loop. connect temp to gnd to regulate the die temperature at +95 c. leave temp floating to regulate the die temperature at +115 c. connect temp to vl to regulate the die temperature at +135 c. temp pulls to gnd through a 50k ? resistor in shutdown. 9 mode mode select input. mode and chgen together control charging functions (table 1). an internal 175k ? pulldown resistor pulls mode low. 10 chgen charge enable input. chgen and mode together control charging functions (table 1). an internal 175k ? pulldown resistor pulls chgen low. 11 acok input voltage range indicator. the open-drain acok output asserts low when 4.2v v in 6.25v and v in - v batt 100mv. acok requires an external 100k ? pullup resistor. acok floats in shutdown. 12 batt battery connection. connect the positive terminal of the battery to batt. batt draws less than 5? during shutdown. 14 selv battery voltage selection input. selv sets the battery regulation voltage in li+ and nimh/nicd modes (table 2). for no-battery mode, the battery voltage defaults to 4.0v. an internal 175k ? resistor to vl pulls selv high. 15 rled battery charging indicator. connect the anode of a red led to in and the cathode to rled . rled asserts low when the input supply is present and the battery is charging, regardless of cell chemistry. rled sinks 10ma. rled goes high impedance in shutdown. connect a pullup resistor to the ?? i/o supply when interfacing with a ? logic input. 16 gled full-charge indicator. connect the anode of a green led to in and the cathode to gled . gled asserts low when the input supply is present and the battery has reached the top-off current threshold set by fulli, regardless of cell chemistry. gled sinks 20ma. gled goes high impedance in shutdown. connect a pullup resistor to the ?? i/o supply when interfacing with a ? logic input.
max1501 highly integrated, linear battery charger with thermal regulation for portable applications 8 _______________________________________________________________________________________ max1501/max1501z output driver and logic uvlo vl ref ovlo logic temperature sensor on v ref temp ref i ref shutdown cs inp in seti vl acok batt selv temp fulli tmax/i.c. osc gnd gnd chgen mode gled rled figure 1. functional diagram
max1501 highly integrated, linear battery charger with thermal regulation for portable applications _______________________________________________________________________________________ 9 10% seti current acok = low rled = on gled = off charger off rled = off gled = on soft-start acok = high charger off acok = low rled = off gled = off off prequal f ast charge top off done nobatt disable acok = low chgen = low acok = (4.2v < v in < 6.25v) and (v in - v batt > 100mv) v batt < 2.8v v batt < 2.8v charger off acok = low rled = off gled = off chgen = high mode = low chgen = low chgen = low (current limited and thermally protected) acok = low rled = off gled = off (thermally protected) 100% seti current acok = low rled = on gled = off i chg < i top-off (voltage loop) rled = off gled = on time > t max time > t max v batt < 4v (li+ mode, selv = vl, and nimh/nicd mode) v batt < 3.9v (li+ mode, selv = gnd) chgen = high mode = high soft-start max1501 only figure 2. max1501 charge state diagram
max1501 highly integrated, linear battery charger with thermal regulation for portable applications 10 ______________________________________________________________________________________ detailed description modes of operation chgen and mode together set the operating modes of the max1501. both inputs possess internal 175k ? pulldown resistors to gnd. table 1 describes the four operating modes of the max1501. 10% seti current acok = low rled = on gled = off soft-start acok = high charger off acok = low rled = off gled = off off prequal f ast charge top off nobatt disable acok = low chgen = low acok = (4.5v < v in < 6.5v) and (v in > v batt) v batt < 2.8v v batt > 2.8v charger off acok = low rled = off gled = off chgen = high mode = low chgen = low chgen = low (current limited and thermally protected) acok = low rled = off gled = off (thermally protected) 100% seti current acok = low rled = on gled = off i chg < i top-off (voltage loop) rled = off gled = on chgen = high mode = high soft-start max1501z only figure 3. max1501z charge state diagram mode chgen mode li+ charge mode 0 0 nimh/nicd charge mode 0 1 disable mode 1 0 no-battery mode 1 1 table 1. modes of operation
max1501 highly integrated, linear battery charger with thermal regulation for portable applications ______________________________________________________________________________________ 11 li+ charge mode connect chgen and mode to gnd to place the max1501 in li+ charging mode. the li+ charger con- sists of a voltage-control loop, a current-control loop, and a thermal-control loop. connect selv to gnd to set the li+ battery voltage to 4.1v. connect selv to vl to set the li+ battery voltage to 4.2v (table 2). the max1501 precharges the li+ battery with 10% of the user-programmed fast-charge current at the start of a charge cycle. a soft-start algorithm ramps up the charging current (10% steps with 20ms duration per step) to the fast-charge current when the battery volt- age reaches 2.8v. the max1501 enters constant-volt- age mode and decreases the charge current when the batt voltage reaches the selected regulation voltage (4.1v or 4.2v). set the fast-charge current with a resis- tor between seti and gnd (see the charge-current selection section). the thermal-regulation loop limits the max1501 die temperature to the value selected by the temp input by reducing the charge current as necessary (see the thermal-regulation selection section). this feature not only protects the max1501 from overheating, but also allows the charge current to be set higher without risking damage to the system. set the top-off-current threshold with the three-state fulli input (see the top-off-current selection section). rled goes high impedance and gled asserts low when the top-off-current threshold is reached. the max1501 automatically initiates recharging when the battery volt- age drops below 95% of the voltage set by selv. (the max1501z does not time out.) nimh/nicd charge mode connect chgen to gnd and mode to vl to place the max1501 in nimh/nicd charging mode. the nimh/nicd battery charger consists of a current-control loop, a volt- age-control loop, and a thermal-control loop. connect selv to gnd to set the regulation voltage to 4.5v. connect selv to vl to set the regulation voltage to 4.95v (table 2). when charging three nimh/nicd cells to 4.95v, v in must be at least 5.25v and a ? must be used to terminate the charge sequence. selv charging mode gnd vl li+ 4.1v 4.2v nimh/nicd 4.5v 4.95v table 2. battery regulation voltage prequalification regulation voltage f ast-charge current minimum charge voltage (2.8v) f ast charging top-off battery voltage battery current charge terminated 10% of fast-charge current done rled turns off and gled turns on when charge current drops to value set by fulli (10%, 20%, or 30% of fast- charge current). t prequal t max max1501z max1501 figure 4. li+ charge sequence
max1501 highly integrated, linear battery charger with thermal regulation for portable applications 12 ______________________________________________________________________________________ the max1501 precharges the nimh/nicd battery with 10% of the user-programmed fast-charge current at the start of a charge cycle. precharge ends and fast charge begins when the battery voltage exceeds 2.8v. set the fast-charge current with a resistor between seti and gnd (see the charge-current selection section). the max1501 enters constant-voltage mode and decreases the charge current when the battery voltage reaches 4.5v. the thermal-regulation loop limits the max1501 die temperature to the value selected by the temp input by reducing the charge current as necessary (see the thermal-regulation selection section). this feature pro- tects the max1501 from overheating when supplying high charge currents, or while operating from high input voltages. set the top-off-current threshold with the three-state fulli input (see the top-off-current selection section). rled goes high impedance and gled asserts low when the top-off current threshold is reached. the max1501 automatically initiates recharging when the battery voltage drops below 4v. (the max1501z does not time out.) no-battery mode connect chgen and mode to vl to place the max1501 in no-battery mode. an external load can be connected to batt in this mode. v batt regulates to 4v in no-battery mode, regardless of the state of selv. the current-control loop, voltage-control loop, and thermal-control loop all function in no-battery mode. the loop gain of the voltage-control loop decreases to ensure stability with no battery present. connect a 10? ceramic capacitor to batt for stability. rled and gled are both high impedance in no-battery mode. acok the acok output asserts low when v in is present, 4.2v v in 6.25v, and v in - v batt > 100mv. the acok open-drain output requires an external 100k ? pullup resistor to an external supply voltage. the external supply voltage must be less than 5.5v. rled and gled indicators rled and gled serve as visual indicators that power is applied as well as the charge status of a battery. rled asserts low when a wall adapter is connected and a battery is charging, regardless of cell chemistry. gled asserts low when power is applied and the bat- tery is fully charged. both outputs go high-impedance in shutdown. connect the anode of each led to in, and the cathode to rled or gled . table 3 summa- rizes the behavior of rled and gled under normal operating conditions. connect pullup resistors to the ? i/o supply when interfacing rled and gled with a ?? logic inputs. soft-start a ten-step, soft-start algorithm activates when entering fast-charge mode. the charging current ramps up in 10% increments, 20ms per step, to the full charging current when v batt exceeds 2.8v. applications information charge-current selection program the charging current using an external resistor between seti and gnd. set the charge-current resistor with the following equation: if v seti = 1.4v, the current-control loop controls the battery charging. if v seti < 1.4v, either the voltage- control loop or the thermal-control loop operates. measure the charging current by monitoring v seti and using the following equation: v i r seti batt seti = 1000 r v i seti batt . = 1000 14 mode state rled gled ?10% current-limited precharge ?current-limited charge ?voltage-limited charge before top-off ?temperature-limited charge before top-off sinks 10ma high impedance li+ mode or nimh/nicd mode ?voltage-limited charge after top-off ?safety timer expires (max1501 only) high impedance sinks 20ma disable mode high impedance high impedance no battery mode high impedance high impedance table 3. rled and gled behavior
max1501 highly integrated, linear battery charger with thermal regulation for portable applications ______________________________________________________________________________________ 13 thermal-regulation selection set the regulated die temperature of the max1501 with the temp three-level logic input. the max1501 reduces the charge current to limit the die temperature to the value set by temp. the max1501 operates nor- mally while the thermal loop is active. an active thermal loop does not indicate a fault condition. temp allows the max1501 to maximize the charge current while pro- viding protection against excessive power dissipation. connect temp to gnd to regulate the die temperature at +95 c. leave temp floating to regulate the die tem- perature at +115 c. connect temp to vl to regulate the die temperature at +135 c. top-off-current selection set the top-off-current threshold in the li+ and nimh/nicd charge modes with the fulli three-level logic input. the top-off-current threshold determines when rled turns off and gled turns on, indicating the charge status of the battery. connect fulli to gnd to set the top-off-current thresh- old to 10% of the fast-charge current. connect fulli to vl to set the top-off-current threshold to 20% of the fast-charge current. leave fulli floating to set the top- off-current threshold to 30% of the fast-charge current. charge-timer selection (max1501 only) set the maximum charging time with the tmax three- level logic input. tmax limits the duration of charging to protect the battery from overcharging. connect tmax to gnd to set the maximum charging time to 3 hours. leave tmax floating to set the maximum charging time to 4.5 hours. connect tmax to vl to set the maximum charging time to 6 hours. capacitor selection connect a ceramic capacitor from batt to gnd for proper stability. use a 10? x5r ceramic capacitor for most applications. connect in and inp together and bypass to gnd with a 1? ceramic capacitor. use a larger input bypass capacitor for high input voltages or high charging cur- rents to reduce supply noise. thermal considerations the max1501 is available in a thermally enhanced thin qfn package with exposed paddle. connect the exposed paddle of the max1501 to a large copper ground plane to provide a thermal contact between the device and the circuit board. the exposed paddle transfers heat away from the device, allowing the max1501 to charge the battery with maximum current, while minimizing the increase in die temperature. application circuits figure 5 shows the max1501 as a stand-alone li+ bat- tery charger. the 2.8k ? resistor connected to seti sets a charging current of 500ma. figure 6 shows the max1501 as a ?-based li+ battery charger. drive chgen low to charge the battery. drive chgen high to disable the charger. connect a 100k ? pullup resistor from acok to the logic supply voltage of the ? to detect the presence of an input supply. the logic supply voltage must be less than 5.5v. max1501/max1501z 1 f 4.5v to 6.5v 2.8k ? in inp temp fulli tmax/i.c. seti gnd gnd gled rled 10 f 4.2v 1-cell li+ batt vl selv mode chgen acok ac adapter figure 5. stand-alone li+ battery charger max1501/max1501z 1 f 4.5v to 6.5v 2.8k ? in inp seti gnd mode gnd gled rled 10 f 4.2v 1-cell li+ batt vl selv tmax/i.c. temp fulli acok ac adapter p v i/o chgen r pullup figure 6. ?-based li+ battery charger
max1501 highly integrated, linear battery charger with thermal regulation for portable applications 14 ______________________________________________________________________________________ figure 7 shows the max1501 as a stand-alone nimh/nicd battery charger. connecting selv to gnd sets the charge termination voltage to 4.5v. figure 8 shows the max1501 as a ?-based nimh/nicd battery charger. connecting selv to vl sets the charge regulation voltage at 4.95v. connect a 100k ? pullup resistor from acok to the logic supply voltage of the ?. the logic supply voltage must be less than 5.5v. figure 9 shows the max1501 as a ?-based single li+ or 3-cell nimh/nicd charger. the states of mode and chgen set the operating mode of the max1501 ( table 1). connect a 100k ? pullup resistor from acok to the logic supply voltage of the ?. the logic supply voltage must be less than 5.5v. figure 10 shows the max1501 as an accurate current- limited low-dropout linear regulator with input overvolt- age protection (no-battery mode). the output voltage regulates to 4v, regardless of the state of selv. connect mode to vl to enable the linear regulator. connect mode to gnd to put the device into shut- down. r seti sets the maximum output current. max1501/max1501z 1 f 4.75v to 6.5v 2.8k ? in inp tmax/i.c. seti gnd gnd gled rled 10 f 4.5v 3-cell nimh or nicd batt vl selv fulli temp mode acok ac adapter chgen figure 7. stand-alone 3-cell nimh or nicd battery charger max1501/max1501z 1 f 5.25v to 6.5v 2.8k ? in inp seti gnd gnd gled rled 10 f 4.95v 3-cell nimh or nicd batt vl selv tmax/i.c. temp fulli acok ac adapter p v i/o chgen r pullup mode figure 8. ?-based nimh or nicd battery charge max1501/max1501z 1 f 4.75v to 6.5v 2.8k ? in inp seti gnd gnd gled rled 10 f 4.1v 1-cell li+ or 4.5v 3-cell nimh/nicd batt vl selv tmax/i.c. temp fulli acok ac adapter p v i/o mode chgen 100k ? figure 9. ?-based single li+/3-cell nimh/nicd battery charger max1501/max1501z 1 f 4.5v to 6.5v current-limit adjust in inp temp fulli tmax/i.c. seti gnd gnd gled rled 10 f 4v batt vl selv mode chgen acok off on up to 1.4a figure 10. input overvoltage-protected and current-limited low-dropout linear regulator
max1501 highly integrated, linear battery charger with thermal regulation for portable applications ______________________________________________________________________________________ 15 figure 11 shows a circuit that adds temperature protec- tion to the battery. install the thermistor as close to the battery as possible to ensure accurate temperature mea- surement. the output of this circuit is logic high when the battery temperature is less than 0? and greater than +50?. driving chgen high disables the charger. layout and bypassing connect in and inp together as close to the device as possible and bypass with a 1? ceramic capacitor. bypass batt to gnd with a 10? ceramic capacitor. provide a large copper gnd plane to allow the exposed paddle to sink heat away from the device. connect the battery to batt as close to the device as possible to provide the most accurate battery voltage sensing. make all high-current traces short and wide to minimize voltage drops. chip information transistor count: 5717 process: bicmos 5v 5v 3k ? 3k ? 3k ? 1k ? 1k ? 100k ? 100k ? 200k ? 5.1k ? 4.1k ? 2.24k ? 3.66k ? 10k ? in gnd rt = 10k ? at +25 c max1501/max1501z chgen t batt r t 0 c 27.28k ? +25 c 10.00k ? +50 c4. 16k ? figure 11. battery temperature protection max1501/ max1501z 16 gled 15 rled 14 selv 13 12 11 10 9 5 6 7 8 1 2 3 4 gnd batt acok chgen mode vl tmax/i.c. fulli temp inp in gnd seti **exposed paddle 5mm x 5mm thin qfn **connect exposed paddle to gnd pin configuration
max1501 highly integrated, linear battery charger with thermal regulation for portable applications maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a maxim product. no circu it patent licenses are implied. maxim reserves the right to change the circuitry and specifications without notice at any time. 16 ____________________maxim integrated products, 120 san gabriel drive, sunnyvale, ca 94086 408-737-7600 2004 maxim integrated products printed usa is a registered trademark of maxim integrated products. package information (the package drawing(s) in this data sheet may not reflect the most current specifications. for the latest package outline info rmation, go to www.maxim-ic.com/packages .) qfn thin.eps d2 (nd-1) ? x ?? e e d c pin ? # ? 1 ? i.d. (ne-1) ? x ?? e e/2 e 0.08 c 0.10 c a a1 a3 detail ? a 0.15 c b 0.15 c a e2/2 e2 0.10 ? m c a b pin ? # ? 1 ? i.d. b 0.35x45 l d/2 d2/2 l c l c e e l c c l k k l l e 1 2 21-0140 package ? outline 16, ? 20, ? 28, ? 32, ? 40l, ? thin ? qfn, ? 5x5x0.8mm detail ? b l l1 e common ? dimensions 3.35 3.15 t2855-1 3.25 3.35 3.15 3.25 max. 3.20 exposed ? pad ? variations 3.00 t2055-2 3.10 d2 nom. min. 3.20 3.00 3.10 min. e2 nom. max. ne nd pkg. codes 1. ??? dimensioning ? & ? tolerancing ? conform ? to ? asme ? y14.5m-1994. 2. ??? all ? dimensions ? are ? in ? millimeters. ? angles ? are ? in ? degrees. 3. ??? n ? is ? the ? total ? number ? of ? terminals. 4. ??? the ? terminal ? #1 ? identifier ? and ? terminal ? numbering ? convention ? shall ? conform ? to ? jesd ? 95-1 ? ?????? spp-012. ?? details ? of ? terminal ? #1 ? identifier ? are ? optional, ? but ? must ? be ? located ? within ? the ? ?????? zone ? indicated. ? the ? terminal ? #1 ? identifier ? may ? be ? either ? a ? mold ? or ? marked ? feature. 5. ??? dimension ? b ? applies ? to ? metallized ? terminal ? and ? is ? measured ? between ? 0.25 ? mm ? and ? 0.30 ? mm ? ?????? from ? terminal ? tip. 6. ??? nd ? and ? ne ? refer ? to ? the ? number ? of ? terminals ? on ? each ? d ? and ? e ? side ? respectively. 7. ??? depopulation ? is ? possible ? in ? a ? symmetrical ? fashion. 8. ??? coplanarity ? applies ? to ? the ? exposed ? heat ? sink ? slug ? as ? well ? as ? the ? terminals. 9. ??? drawing ? conforms ? to ? jedec ? mo220, ? except ? exposed ? pad ? dimension ? for ? t2855-1, ? ?????? t2855-3 ? and ? t2855-6. notes: symbol pkg. n l1 e e d b a3 a a1 k 10. ??? warpage ? shall ? not ? exceed ? 0.10 ? mm. jedec t1655-1 3.20 3.00 3.10 3.00 3.10 3.20 0.70 0.80 0.75 4.90 4.90 0.25 0.25 0 -- 4 whhb 4 16 0.35 0.30 5.10 5.10 5.00 0.80 ? bsc. 5.00 0.05 0.20 ? ref. 0.02 min. max. nom. 16l ?? 5x5 3.10 t3255-2 3.00 3.20 3.00 3.10 3.20 2.70 t2855-2 2.60 2.60 2.80 2.70 2.80 e 2 2 21-0140 package ? outline 16, ? 20, ? 28, ? 32, ? 40l, ? thin ? qfn, ? 5x5x0.8mm l 0.30 0.50 0.40 -- - -- - whhc 20 5 5 5.00 5.00 0.30 0.55 0.65 ? bsc. 0.45 0.25 4.90 4.90 0.25 0.65 - - 5.10 5.10 0.35 20l ?? 5x5 0.20 ? ref. 0.75 0.02 nom. 0 0.70 min. 0.05 0.80 max. -- - whhd-1 28 7 7 5.00 5.00 0.25 0.55 0.50 ? bsc. 0.45 0.25 4.90 4.90 0.20 0.65 - - 5.10 5.10 0.30 28l ?? 5x5 0.20 ? ref. 0.75 0.02 nom. 0 0.70 min. 0.05 0.80 max. -- - whhd-2 32 8 8 5.00 5.00 0.40 0.50 ? bsc. 0.30 0.25 4.90 4.90 0.50 - - 5.10 5.10 32l ?? 5x5 0.20 ? ref. 0.75 0.02 nom. 0 0.70 min. 0.05 0.80 max. - 40 10 10 5.00 5.00 0.20 0.50 0.40 ? bsc. 0.40 0.25 4.90 4.90 0.15 0.60 5.10 5.10 0.25 40l ?? 5x5 0.20 ? ref. 0.75 nom. 0 0.70 min. 0.05 0.80 max. 0.20 0.25 0.30 - 0.35 0.45 0.30 0.40 0.50 down ? bonds ? allowed no yes 3.10 3.00 3.20 3.10 3.00 3.20 t2055-3 3.10 3.00 3.20 3.10 3.00 3.20 t2055-4 t2855-3 3.15 3.25 3.35 3.15 3.25 3.35 t2855-6 3.15 3.25 3.35 3.15 3.25 3.35 t2855-4 2.60 2.70 2.80 2.60 2.70 2.80 t2855-5 2.60 2.70 2.80 2.60 2.70 2.80 t2855-7 2.60 2.70 2.80 2.60 2.70 2.80 3.20 3.00 3.10 t3255-3 3.20 3.00 3.10 3.20 3.00 3.10 t3255-4 3.20 3.00 3.10 3.40 3.20 3.30 t4055-1 3.20 3.30 3.40 no no no no no no no no yes yes yes yes yes 3.20 3.00 t1655-2 3.10 3.00 3.10 3.20 yes

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