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ltc4059/ltc4059a 1 4059fb wireless pdas cellular phones portable electronics wireless headsets digital cameras programmable charge current up to 900ma charge current monitor output for charge termination constant-current/constant-voltage operation with thermal regulation to maximize charging rate without risk of overheating constant-current source mode for charging nickel batteries (ltc4059 only) acpr pin indicates presence of input supply (ltc4059a only) no external mosfet, sense resistor or blocking diode required operating supply voltage from 3.75v to 8v charges single cell li-ion batteries directly from usb port preset 4.2v charge voltage with 0.6% accuracy 10 a supply current in shutdown mode tiny 6-lead (2mm 2mm) dfn package 900ma linear li-ion battery chargers with thermal regulation in 2 2 dfn the ltc 4059/ltc4059a are constant-current/constant- voltage linear chargers for single cell lithium-ion batteries. their 2mm 2mm dfn package and low external compo- nent count make these chargers especially well suited for portable applications. furthermore, they are designed to work within usb power specifications. no external sense resistor, mosfet or blocking diode is required. thermal feedback regulates the charge current to limit the die temperature during high power operation or high ambient thermal conditions. the charge voltage is fixed at 4.2v and the charge current is programmable. when the input supply (wall adapter or usb supply) is removed, the ltc4059/ltc4059a automatically enter a low current state, dropping the battery current drain to less than 1 a. with power applied, they can be put into shutdown mode, reducing the supply current to 10 a. the ltc4059a features an open-drain status pin to indi- cate the presence of an input voltage. the ltc4059 can be used as a constant-current source to charge nickel cells. other features include undervoltage lockout protection and a current monitor pin which can indicate when to terminate a charge cycle. the ltc4059/ltc4059a are available in a 6-lead, low profile (0.75mm) 2mm 2mm dfn package. complete charge cycle (800mah battery) time (hours) 0 500 600 700 2 4059 ta02 400 300 0.5 1 1.5 2.5 200 100 0 4.0 4.2 4.4 3.8 3.6 3.4 3.2 3.0 charge current (ma) battery voltage (v) constant current constant voltage v cc = 5v r prog = 2k t a = 25 c features descriptio u applicatio s u typical applicatio u v cc ltc4059a v in 4.5v to 8v en gnd bat 1 f 2k 50k 4.2v li-ion battery 600ma v dd p 4059 ta01 acpr prog + , ltc and lt are registered trademarks of linear technology corporation. all other trademarks are the property of their respective owners. protected by u.s. patents, including 6522118.
ltc4059/ltc4059a 2 4059fb input supply voltage (v cc ) ...................... 0.3v to 10v bat, prog, en, li cc, acpr ................... 0.3v to 10v bat short-circuit duration ........................... continuous bat pin current ............................................... 1000ma prog pin current ............................................. 1000 a junction temperature .......................................... 125 c operating temperature range (note 2) .. 40 c to 85 c storage temperature range ................. 65 c to 125 c order part number consult ltc marketing for parts specified with wider operating temperature ranges. ltc4059edc LTC4059AEDC absolute axi u rati gs w ww u package/order i for atio uu w (note 1) t jmax = 125 c, ja = 60 c/w to 85 c/w (note 3) *li cc pin 2 on ltc4059edc, acpr pin 2 on LTC4059AEDC exposed pad (pin 7) is gnd must be soldered to pcb top view 7 dc6 package 6-lead (2mm 2mm) plastic dfn 4 5 6 3 2 1 gnd bat en prog v cc li cc/acpr* dc6 part marking lafu lbjh electrical characteristics the denotes the specifications which apply over the full operating temperature range, otherwise specifications are at t a = 25 c. v cc = 5v unless otherwise noted. symbol parameter conditions min typ max units v cc v cc supply voltage 3.75 8 v i cc quiescent v cc supply current v bat = 4.5v (forces i bat and i prog = 0) 25 60 a i ccms v cc supply current in shutdown v en = v cc 10 25 a i ccuv v cc supply current in undervoltage v cc < v bat ; v cc = 3.5v, v bat = 4v 410 a lockout v float v bat regulated output voltage i bat = 2ma 4.175 4.2 4.225 v 4.5v < v cc < 8v, i bat = 2ma 4.158 4.2 4.242 v i bat bat pin current r prog = 2.43k, current mode, v bat = 3.8v 475 500 525 ma r prog = 12.1k, current mode, v bat = 3.8v 94 100 106 ma i bms battery drain current in shutdown v en = v cc , v cc > v bat 0 1 a i buv battery drain current in undervoltage v cc < v bat , v bat = 4v 014 a lockout v uv v cc ?v bat undervoltage lockout v cc from low to high, v bat = 3.7v 100 150 200 mv threshold v cc from high to low, v bat = 3.7v 03580 mv v prog prog pin voltage r prog = 2.43k, i prog = 500 a 1.18 1.21 1.24 v r prog = 12.1k, i prog = 100 a 1.18 1.21 1.24 v v ms manual shutdown threshold v en increasing 0.3 0.92 1.2 v v mshys manual shutdown hysteresis v en decreasing 85 mv r en en pin input resistance v en = 5v 1 1.85 3 m ? v li cc voltage mode disable threshold v li cc increasing (ltc4059 only) 0.3 0.92 1.2 v v li cchys voltage mode disable hysteresis v li cc decreasing (ltc4059 only) 85 mv v acpr acpr pin output low voltage i acpr = 300 a (ltc4059a only) 0.25 0.5 v t lim junction temperature in constant 115 c temperature mode r on power fet ?n?resistance i bat = 150ma (note 4) 800 1200 m ? (between v cc and bat) note 1: absolute maximum ratings are those values beyond which the life of a device may be impaired. note 2: the ltc4059e/ltc4059ae are guaranteed to meet performance specifications from 0 c to 70 c. specifications over the 40 c to 85 c operating temperature range are assured by design, characterization and correlation with statistical process controls. note 3: failure to solder the exposed backside of the package to the pc board ground plane will result in a thermal resistance much higher than 60 c/w. note 4: the fet on-resistance is guaranteed by correlation to wafer level measurements.
ltc4059/ltc4059a 3 4059fb typical perfor a ce characteristics uw battery regulation (float) voltage vs battery charge current i bat (ma) 0 v float (v) 4.16 4.18 4.20 300 500 4059 g01 4.14 4.12 4.10 100 200 400 4.22 4.24 4.26 v cc = 5v t a = 25 c r prog = 2.43k temperature ( c) ?0 v float (v) 4.19 4.20 4.21 25 75 4059 g02 4.18 4.17 4.16 ?5 0 50 4.22 4.23 4.24 100 v cc = 5v i bat = 2ma r prog = 2.43k v cc (v) 4 v float (v) 4.19 4.20 4.21 7 4059 g03 4.18 4.17 4.16 56 4.22 4.23 4.24 8 t a = 25 c i bat = 10ma r prog = 2.43k battery regulation (float) voltage vs temperature regulated output (float) voltage vs supply voltage charge current vs input voltage charge current vs ambient temperature with thermal regulation v cc (v) 4 0 i bat (ma) 100 200 300 400 500 600 56 78 4059 g04 v bat = 3.85v t a = 25 c thermal limiting r prog = 2.43k r prog = 12.1k charge current vs battery voltage v bat (v) 2.5 0 i bat (ma) 100 200 300 400 500 600 3 3.5 4 4.5 4059 g05 li cc = 5v ltc4059 only li cc = 0v ltc4059a v cc = 5v t a = 25 c r prog = 2.43k ambient temperature ( c) ?0 i bat (ma) 400 500 600 25 75 4059 g06 300 200 ?5 0 50 100 125 100 0 r prog = 12.1k r prog = 2.43k v cc = 5v v bat = 3.85v thermal control loop in operation prog pin voltage vs temperature (constant current mode) prog pin voltage vs charge current power fet ?n?resistance vs temperature i bat (ma) 0 1.0 1.2 1.4 400 4059 f07 0.8 0.6 100 200 300 500 0.4 0.2 0 v prog (v) v cc = 5v t a = 25 c r prog = 2.43k temperature ( c) ?0 400 r ds(on) (m ? ) 500 600 700 800 1200 1000 ?5 02550 4059 g09 75 100 900 v cc = 5v i bat = 100ma temperature ( c) ?0 v prog (v) 1.22 1.23 1.24 25 75 4059 g08 1.21 1.20 ?5 0 50 100 125 1.19 1.18 r prog = 12.1k r prog = 2.43k v cc = 5v v bat = 3.85v
ltc4059/ltc4059a 4 4059fb typical perfor a ce characteristics uw v cc ?v bat undervoltage lockout threshold vs battery voltage en pin current vs en voltage and temperature uvlo battery drain current vs battery voltage v bat (v) 3 v uv (mv) 300 400 500 7 4059 g10 200 100 250 350 450 150 50 0 4 5 6 8 t a = 25 c r prog = 12.1k v en (v) 0 3.5 3.0 2.5 2.0 1.5 1.0 0.5 0 35 4059 g11 12 46 en ( a) t a = 100 c t a = ?0 c t a = 25 c v bat (v) 0 i buv ( a) 1.2 1.6 2.0 4 4059 g12 0.8 0.4 1.0 1.4 1.8 0.6 0.2 0 1 2 3 5 v cc = 0v t a = 25 c uvlo battery drain current vs temperature manual shutdown supply current vs temperature temperature ( c) 50 ?5 0 i buv ( a) 1.0 2.5 0 50 75 4059 g13 0.5 2.0 1.5 25 100 125 v cc = 0v v bat = 4v temperature ( c) ?0 8 10 14 25 75 4059 g14 6 4 ?5 0 50 100 125 2 0 12 i ccms ( a) v cc = 5v v en = 5v manual shutdown threshold voltage vs temperature voltage mode disable threshold voltage vs temperature (ltc4059 only) temperature ( c) ?0 0.6 v ms (v) 0.7 0.8 0.9 1.0 1.2 ?5 02550 4059 f15 75 100 1.1 rising falling temperature ( c) ?0 0.6 v li cc (v) 0.7 0.8 0.9 1.0 1.2 ?5 02550 4059 f16 75 100 1.1 rising falling acpr pin output low voltage vs temperature (ltc4059a only) temperature ( c) ?0 v acpr (v) 0.45 25 4059 g17 0.30 0.20 ?5 0 50 0.15 0.10 0.50 0.40 0.35 0.25 75 100 125 v cc = 5v v bat = 4.2v i acpr = 300 a v acpr (v) 0 i acpr (ma) 2.0 3.0 8 4059 g18 1.0 0 2 4 6 1 3 5 7 4.0 1.5 2.5 0.5 3.5 v cc = 5v v bat = 4.2v t a = 25 c acpr pin (pull-down state) i-v curve (ltc4059a only)
ltc4059/ltc4059a 5 4059fb pi fu ctio s uuu gnd (pins 1, 7): ground/exposed pad. the exposed package pad is ground and must be soldered to the pc board for maximum heat transfer. li cc (pin 2, ltc4059): li-ion/constant current input pin. pulling this pin above v li cc disables voltage mode thereby providing a constant current to the bat pin. this feature is useful for charging nickel chemistry batteries. tie to gnd if unused. acpr (pin 2, ltc4059a): open-drain power supply status output. when v cc is greater than the undervoltage lockout threshold, the acpr pin will pull to ground; otherwise the pin is forced to a high impedance state. bat (pin 3): charge current output. provides charge current to the battery and regulates the final float voltage to 4.2v. an internal precision resistor divider from this pin sets this float voltage and is disconnected in shutdown mode. v cc (pin 4): positive input supply voltage. this pin provides power to the charger. v cc can range from 3.75v to 8v. this pin should be bypassed with at least a 1 f capacitor. when v cc is within 35mv of the bat pin voltage, the ltc4059 enters shutdown mode, dropping i bat to less than 4 a. prog (pin 5): charge current program and charge cur- rent monitor pin. connecting a resistor, r prog , to ground programs the charge current. when charging in constant- current mode, this pin servos to 1.21v. in all modes, the voltage on this pin can be used to measure the charge current using the following formula: i v r bat prog prog = 1000 en (pin 6): enable input pin. pulling this pin above the manual shutdown threshold (v ms is typically 0.92v) puts the ltc4059 in shutdown mode, thus terminating a charge cycle. in shutdown mode, the ltc4059 has less than 25 a supply current and less than 1 a battery drain current. enable is the default state, but the pin should be tied to gnd if unused.
ltc4059/ltc4059a 6 4059fb block diagra w 2 1,7 3 4 6 + + ma v cc m2 1 d1 m1 1000 r1 r2 r3 d3 + + ca ref ta + t die 115 c 1.2v voltage reference va bat ref logic r en en d2 li cc prog gnd 4059 f01 5 figure 1 (ltc4059) 1,7 3 4 6 + + ma v cc m2 1 d1 bat v cc m1 1000 r1 r2 r3 d3 + + + ca ref ta + t die 115 c 1.2v voltage reference va bat ref logic r en en 2 acpr d2 prog gnd 4059 f02 5 figure 2 (ltc4059a)
ltc4059/ltc4059a 7 4059fb operatio u the ltc4059/ltc4059a are linear battery chargers de- signed primarily for charging single cell lithium-ion bat- teries. featuring an internal p-channel power mosfet, the chargers use a constant-current/constant-voltage charge algorithm with programmable current. charge current can be programmed up to 900ma with a final float voltage accuracy of 0.6%. no blocking diode or external sense resistor is required; thus, the basic charger circuit requires only two external components. the acpr pin (ltc4059a) monitors the status of the input voltage with an open-drain output. the li cc pin (ltc4059) disables constant-voltage operation and turns the ltc4059 into a precision current source capable of charging nickel chem- istry batteries. furthermore, the ltc4059/ltc4059a are designed to operate from a usb power source. an internal thermal limit reduces the programmed charge current if the die temperature attempts to rise above a preset value of approximately 115 c. this feature protects the ltc4059/ltc4059a from excessive temperature, and allows the user to push the limits of the power handling capability of a given circuit board without risk of damaging the ltc4059/ltc4059a or external components. another benefit of the thermal limit is that charge current can be set according to typical, not worst-case, ambient tempera- tures for a given application with the assurance that the charger will automatically reduce the current in worst- case conditions. the charge cycle begins when the voltage at the v cc pin rises approximately 150mv above the bat pin voltage, a program resistor is connected from the prog pin to ground, and the en pin is pulled below the shutdown threshold (typically 0.92v). if the bat pin voltage is below 4.2v, or the li cc pin is pulled above v li cc (ltc4059 only), the ltc4059 will charge the battery with the programmed current. this is constant-current mode. when the bat pin approaches the final float voltage (4.2v), the ltc4059 enters constant- voltage mode and the charge current begins to decrease. to terminate the charge cycle the en should be pulled above the shutdown threshold. alternatively, reducing the input voltage below the bat pin voltage will also terminate the charge cycle. applicatio s i for atio wu uu programming charge current the charge current is programmed using a single resistor from the prog pin to ground. the battery charge current is 1000 times the current out of the prog pin. the program resistor and the charge current are calculated using the following equations: r v i i v r prog chg chg prog == 1000 121 1000 121 . , . for best stability over temperature and time, 1% metal- film resistors are recommended. the charge current out of the bat pin can be determined at any time by monitoring the prog pin voltage and using the following equation: i v r bat prog prog = 1000 undervoltage lockout (uvlo) an internal undervoltage lockout circuit monitors the input voltage and keeps the charger in undervoltage lockout until v cc rises approximately 150mv above the bat pin voltage. the uvlo circuit has a built-in hysteresis of 115mv. if the bat pin voltage is below approximately 2.75v, then the charger will remain in undervoltage lockout until v cc rises above approximately 3v. during undervoltage lockout conditions, maximum battery drain current is 4 a. power supply status indicator (acpr, ltc4059a only) the power supply status output has two states: pull-down and high impedance. the pull-down state indicates that v cc is above the undervoltage lockout threshold (see undervoltage lockout). when this condition is not met, the acpr pin is high impedance indicating that the ltc4059a is unable to charge the battery.
ltc4059/ltc4059a 8 4059fb shutdown mode charging can be terminated by pulling the en pin above the shutdown threshold (approximately 0.92v). in shutdown mode, the battery drain current is reduced to less than 1 a and the supply current to 10 a. usb and wall adapter power although the ltc4059 /ltc4059a allow charging from a usb port, a wall adapter can also be used to charge li-ion batteries. figure 3 shows an example of how to combine wall adapter and usb power inputs. a p-channel mosfet, mp1, is used to prevent back conducting into the usb port when a wall adapter is present and schottky diode, d1, is used to prevent usb power loss through the 1k pull-down resistor. typically a wall adapter can supply significantly more current than the 500ma limited usb port. therefore, an n-channel mosfet, mn1, and an extra program resistor are used to increase the charge current to 850ma when the wall adapter is present. ance of the current source pair, m1 and m2 (note that m1 is the internal p-channel power mosfet). it ensures that the drain current of m1 is exactly 1000 times greater than the drain current of m2. amplifiers ca and va are used in separate feedback loops to force the charger into constant-current or voltage mode, respectively. diodes d1 and d2 provide priority to either the constant-current or constant-voltage loop; whichever is trying to reduce the charge current the most. the output of the other amplifier saturates low which effectively removes its loop from the system. when in constant-current mode, ca servos the voltage at the prog pin to be 1.21v. va servos its inverting input to precisely 1.21v when in constant-voltage mode and the internal resistor divider made up of r1 and r2 ensures that the battery voltage is maintained at 4.2v. the prog pin voltage gives an indication of the charge current during constant-voltage mode as discussed in the pro- gramming charge current section. transconductance amplifier, ta, limits the die tempera- ture to approximately 115 c when in constant-tempera- ture mode. ta acts in conjunction with the constant-current loop. when the die temperature exceeds approximately 115 c, ta sources current through r3. this causes ca to reduce the charge current until the prog pin voltage plus the voltage across r3 equals 1.21v. diode d3 ensures that ta does not affect the charge current when the die tem- perature is below approximately 115 c. the prog pin voltage continues to give an indication of the charge current. in typical operation, the charge cycle begins in constant- current mode with the current delivered to the battery equal to 1210v/r prog . if the power dissipation of the ltc4059 /ltc4059a results in the junction temperature approaching 115 c, the amplifier (ta) will begin decreas- ing the charge current to limit the die temperature to approximately 115 c. as the battery voltage rises, the ltc4059 /ltc4059a either return to constant-current mode or enter constant-voltage mode straight from constant- temperature mode. regardless of mode, the voltage at the prog pin is proportional to the current delivered to the battery. applicatio s i for atio wu uu figure 3. combining wall adapter and usb power bat ltc4059 3.4k 2.43k 1k mn1 mp1 5v wall adapter 850ma i chg usb power 500ma i chg i chg v cc 3 d1 4 5 li-ion battery 4059 f03 system load prog + constant current/constant voltage/ constant temperature the ltc4059 /ltc4059a use a unique architecture to charge a battery in a constant-current, constant-voltage and constant-temperature fashion. figures 1 and 2 show simplified block diagrams of the ltc4059 and ltc4059a respectively. three of the amplifier feedback loops shown control the constant-current, ca, constant-voltage, va, and constant-temperature, ta modes. a fourth amplifier feedback loop, ma, is used to increase the output imped-
ltc4059/ltc4059a 9 4059fb power dissipation the conditions that cause the ltc4059 /ltc4059a to reduce charge current through thermal feedback can be approximated by considering the power dissipated in the ic. for high charge currents, the ltc4059 power dissipa- tion is approximately: p d = (v cc ?v bat ) ?i bat where p d is the power dissipated, v cc is the input supply voltage, v bat is the battery voltage and i bat is the charge current. it is not necessary to perform any worst-case power dissipation scenarios because the ltc4059 / ltc4059a will automatically reduce the charge current to maintain the die temperature at approximately 115 c. however, the approximate ambient temperature at which the thermal feedback begins to protect the ic is: t a = 115 c ?p d ja t a = 115 c ?(v cc ?v bat ) ?i bat ? ja example: consider an ltc4059 operating from a 5v wall adapter providing 900ma to a 3.7v li-ion battery. the ambient temperature above which the ltc4059 /ltc4059a begin to reduce the 900ma charge current is approximately: t a = 115 c ?(5v ?3.7v) ?(900ma) ?50 c/w t a = 115 c ?1.17w ?50 c/w = 115 c ?59 c t a = 56 c the ltc4059 can be used above 56 c, but the charge current will be reduced from 900ma. the approximate current at a given ambient temperature can be calculated: i ct vv bat a cc bat ja = () 115 using the previous example with an ambient temperature of 65 c, the charge current will be reduced to approximately: i cc vv cw c ca ima bat bat = () = = 115 65 537 50 50 65 770 ? / / furthermore, the voltage at the prog pin will change proportionally with the charge current as discussed in the programming charge current section. it is important to remember that ltc4059 /ltc4059a applications do not need to be designed for worst-case thermal conditions since the ic will automatically reduce power dissipation when the junction temperature reaches approximately 115 c. board layout considerations in order to be able to deliver maximum charge current under all conditions, it is critical that the exposed metal pad on the backside of the ltc4059 /ltc4059a package is soldered to the pc board ground. correctly soldered to a 2500mm 2 double sided 1oz copper board the ltc4059 / ltc4059a have a thermal resistance of approximately 60 c/w. failure to make thermal contact between the exposed pad on the backside of the package and the copper board will result in thermal resistances far greater than 60 c/w. as an example, a correctly soldered ltc4059 / ltc4059a can deliver over 900ma to a battery from a 5v supply at room temperature. without a backside thermal connection, this number could drop to less than 500ma. stability considerations the ltc4059 contains two control loops: constant voltage and constant current. the constant-voltage loop is stable without any compensation when a battery is connected with low impedance leads. excessive lead length, how- ever, may add enough series inductance to require a bypass capacitor of at least 1 f from bat to gnd. further- more, a 4.7 f capacitor with a 0.2 ? to 1 ? series resistor from bat to gnd is required to keep ripple voltage low when the battery is disconnected. high value capacitors with very low esr (especially ce- ramic) reduce the constant-voltage loop phase margin. ceramic capacitors up to 22 f may be used in parallel with a battery, but larger ceramics should be decoupled with 0.2 ? to 1 ? of series resistance. i n constant-current mode, the prog pin is in the feedback loop, not the battery. because of the additional pole created by prog pin capacitance, capacitance on this pin must be kept to a minimum. with no additional capaci- tance on the prog pin, the charger is stable with program resistor values as high as 12k. however, additional ca- pacitance on this node reduces the maximum allowed applicatio s i for atio wu uu
ltc4059/ltc4059a 10 4059fb program resistor. the pole frequency at the prog pin should be kept above 500khz. therefore, if the prog pin is loaded with a capacitance, c prog , the following equa- tion should be used to calculate the maximum resistance value for r prog : r c prog prog 1 2510 5 average, rather than instantaneous, battery current may be of interest to the user. for example, if a switching power supply operating in low current mode is connected in parallel with the battery, the average current being pulled out of the bat pin is typically of more interest than the instantaneous current pulses. in such a case, a simple rc applicatio s i for atio wu uu filter can be used on the prog pin to measure the average battery current as shown in figure 4. a 20k resistor has been added between the prog pin and the filter capacitor to ensure stability. v cc bypass capacitor many types of capacitors can be used for input bypassing; however, caution must be exercised when using multi- layer ceramic capacitors. because of the self-resonant and high q characteristics of some types of ceramic capaci- tors, high voltage transients can be generated under some start-up conditions, such as connecting the charger input to a live power source. for more information, refer to application note 88. figure 4. isolating capacitive load on prog pin and filtering figure 5. photo of typical circuit (2.5mm 2.7mm) ltc4059 c filter charge current montior circuitry r prog 20k 4059 f04 prog gnd
ltc4059/ltc4059a 11 4059fb u package descriptio dc package 6-lead plastic dfn (2mm 2mm) (reference ltc dwg # 05-08-1703) information furnished by linear technology corporation is believed to be accurate and reliable. however, no responsibility is assumed for its use. linear technology corporation makes no represen- tation that the interconnection of its circuits as described herein will not infringe on existing patent rights. 2.00 0.10 (4 sides) note: 1. drawing to be made a jedec package outline m0-229 variation of (wccd-2) 2. drawing not to scale 3. all dimensions are in millimeters 4. dimensions of exposed pad on bottom of package do not include mold flash. mold flash, if present, shall not exceed 0.15mm on any side 5. exposed pad shall be solder plated 6. shaded area is only a reference for pin 1 location on the top and bottom of package 0.38 0.05 bottom view?xposed pad 0.56 0.05 (2 sides) 0.75 0.05 r = 0.115 typ 1.37 0.05 (2 sides) 1 3 6 4 pin 1 bar top mark (see note 6) 0.200 ref 0.00 ?0.05 (dc6) dfn 1103 0.25 0.05 0.50 bsc 0.25 0.05 1.42 0.05 (2 sides) recommended solder pad pitch and dimensions 0.61 0.05 (2 sides) 1.15 0.05 0.675 0.05 2.50 0.05 package outline 0.50 bsc pin 1 chamfer of exposed pad
ltc4059/ltc4059a 12 4059fb linear technology corporation 1630 mccarthy blvd., milpitas, ca 95035-7417 (408) 432-1900 fax: (408) 434-0507 www.linear.com ? linear technology corporation 2003 lt/lt 0505 rev b ?printed in usa part number description comments ltc1733 monolithic lithium-ion linear battery charger standalone charger with programmable timer, up to 1.5a charge current ltc1734 lithium-ion linear battery charger in thinsot tm simple thinsot charger, no blocking diode, no sense resistor needed ltc1998 lithium-ion low battery detector 1% accurate 2.5 a quiescent current, sot-23 ltc4050 lithium-ion linear battery charger controller simple charger uses external fet, features preset voltages, c/10 charger detection and programmable timer, input power good indication, thermistor interface ltc4052 monolithic lithium-ion battery pulse charger no blocking diode or external power fet required ltc4053 usb compatible monolithic li-ion battery charger standalone charger with programmable timer, up to 1.25a charge current ltc4054 standalone linear li-ion battery charger thermal regulation prevents overheating, c/10 termination, with integrated pass transistor in thinsot c/10 indicator ltc4056 standalone lithium-ion linear battery charger standalone charger with programmable timer, no blocking diode, in thinsot no sense resistor needed ltc4057 monolithic lithium-ion linear battery charger no external mosfet, sense resistor or blocking diode required, with thermal regulation in thinsot charge current monitor for gas gauging ltc4410 usb power manager for simultaneous operation of usb peripheral and battery charging from usb port, keeps current drawn from usb port constant, keeps battery fresh, use with the ltc4053, ltc1733 or ltc4054 ltc4058 950ma standalone li-ion charger in 3mm 3mm usb compatible, thermal regulation protects against overheating dfn thinsot is a trademark of linear technology corporation. related parts u typical applicatio v cc ltc4059 v in 4.5v to 6.5v en li cc bat 1 f 2k 4.2v li-ion battery 600ma 4059 ta03 prog gnd +

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