View LTC4413EDD-2PBF_4558825.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

ltc4413-1/ltc4413-2 1 441312fd typical application features applications description dual 2.6a, 2.5v to 5.5v fast ideal diodes in 3mm 3mm dfn the ltc ? 4413-1 and ltc4413-2 each contain two mono- lithic ideal diodes, each capable of supplying up to 2.6a from input voltages between 2.5v and 5.5v. the ideal diodes use a 100m p-channel mosfet to independently connect ina to outa and inb to outb. during normal forward operation, the voltage drops across each of these diodes are regulated to as low as 18mv. quiescent current is less than 80a for diode currents up to 1a. if either of the output voltages exceeds its respective input voltage, that mosfet is turned off and less than 1a of reverse current ? ows from out to in. maximum forward current in each mosfet is limited to a constant 2.6a and internal thermal limiting circuits protect the part during fault conditions. an internal overvoltage protection sensor detects when a voltage exceeds the ltc4413-2 absolute maximum voltage tolerance. two active-high control pins independently turn off the two ideal diodes contained within the ltc4413-1/ltc4413-2. when the selected channel is reverse biased, or the ltc4413-1/ltc4413-2 is put into low power standby, the status signal is pulled low by an 11a open drain. the ltc4413-1/ltc4413-2 are housed in a 10-lead 3mm 3mm dfn package. l , lt, ltc, ltm, linear technology and the linear logo are registered trademarks of linear technology corporation. powerpath is a trademark of linear technology corporation. all other trademarks are the property of their respective owners. n 2-channel ideal diode oring or load sharing n low loss replacement for powerpath? oring diodes n fast response replacement for ltc4413 n low forward on-resistance (140m max at 3.6v) n low reverse leakage current n low regulated forward voltage (18mv typ) n overvoltage protection sensor with drive output for an external p-channel mosfet (ltc4413-2 only) n 2.5v to 5.5v operating range n 2.6a maximum forward current n internal current limit protection n internal thermal protection n status output to indicate if selected channel is conducting n programmable channel on/off n low pro? le (0.75mm) 10-lead 3mm 3mm dfn package n battery and wall adapter diode oring in handheld products n backup battery diode oring n power switching n usb peripherals n uninterruptable supplies ina ideal fdr8508 ltc4413-2 inb ideal bat enba gnd enbb outa outb stat 470k 4.7 f 441312 ta01a stat stat is high when wall adapter is supplying load current ovp is high when wall adapter voltage > 6v ovp to load v cc ovi ovp + 10f 0.1f wall adapter input 1 automatic switchover from a battery to a wall adapter load (ma) 0 700 600 500 400 300 200 100 0 1500 2500 441312 ta01b 500 1000 2000 3000 power loss (mw) 1n5817 ltc4413-1 power loss vs load
ltc4413-1/ltc4413-2 2 441312fd pin configuration electrical characteristics absolute maximum ratings ina, inb, outa, outb, stat, enba, enbb voltage .................................... ?0.3v to 6v ovi, ovp voltage ....................................... ?0.3v to 13v operating temperature range .................?40c to 85c (note 1) symbol parameter conditions min typ max units v in , v out operating supply range for channel a or b v in and/or v out must be in this range for proper operation l 2.5 5.5 v uvlo uvlo turn-on rising threshold max (v ina , v inb , v outa , v outb ) l 2.45 v uvlo turn-off falling threshold max (v ina , v inb , v outa , v outb ) l 1.7 v i qf quiescent current in forward regulation, measured via gnd v ina = 3.6v, i ina = 100ma, v inb = 0v, i inb = 0ma (note 3) l 40 58 a i qrin current drawn from or sourced into in when v out is greater than v in v in = 3.6v, v out = 5.5v (note 6) l ?1 2.5 4.5 a i qrgnd quiescent current while in reverse turn-off, measured via gnd v ina = v inb = 0v, v outb = v outa = 5.5v, v stat = 0v 28 36 a ltc4413-1 ltc4413-2 top view 11 dd package 10-lead ( 3mm 3mm ) plastic dfn 10 9 6 7 8 4 5 3 2 1 outa stat nc nc outb ina enba gnd enbb inb t jmax = 125c, ja = 43c/w exposed pad (pin 11) is gnd, must be soldered to pcb top view 11 dd package 10-lead ( 3mm 3mm ) plastic dfn 10 9 6 7 8 4 5 3 2 1 outa stat ovi ovp outb ina enba gnd enbb inb t jmax = 125c, ja = 43c/w exposed pad (pin 11) is gnd, must be soldered to pcb the l denotes the speci? cations which apply over the full operating temperature range, otherwise speci? cations are at t a = 25c. (notes 2, 6) storage temperature range .................. ?65c to 125c continuous power dissipation ..........................1500mw (derate 25mw/c above 70c) lead free finish tape and reel part marking package description temperature range ltc4413edd-1#pbf ltc4413edd-1#trpbf lcpp 10-lead (3mm 3mm) plastic dfn ?40c to 85c ltc4413edd-2#pbf ltc4413edd-2#trpbf lcpq 10-lead (3mm 3mm) plastic dfn ?40c to 85c lead based finish tape and reel part marking package description temperature range ltc4413edd-1 ltc4413edd-1#tr lcpp 10-lead (3mm 3mm) plastic dfn ?40c to 85c ltc4413edd-2 ltc4413edd-2#tr lcpq 10-lead (3mm 3mm) plastic dfn ?40c to 85c consult ltc marketing for parts speci? ed with wider operating temperature ranges. for more information on lead free part marking, go to: http://www.linear.com/leadfree/ for more information on tape and reel speci? cations, go to: http://www.linear.com/tapeandreel/ order information
ltc4413-1/ltc4413-2 3 441312fd electrical characteristics the l denotes the speci? cations which apply over the full operating temperature range, otherwise speci? cations are at t a = 25c. (notes 2, 6) symbol parameter conditions min typ max units i qroutb quiescent current while in reverse turn-off. current drawn from v outa when outb supplies chip power v ina = v inb = 0v, v outa = 3.6v, v outb = 5.5v l 3.5 6.5 a i qoff quiescent current with both enba and enbb high v ina = v inb = 3.6v, v enba = v enbb = 1v l 28 38 a v rto reverse turn-off voltage (v out C v in )v in = 3.6v l C5 10 mv v fwd forward voltage drop (v in C v out ) at i out = C1ma v in = 3.6v l 18 24 mv r fwd on-resistance, r fwd regulation (measured as v/ i) v in = 3.6v, i out = C100ma to C500ma (note 5) 100 140 m r on on-resistance, r on regulation (measured as v/i at i in = 1a) v in = 3.6v, i in = 1a (note 5) 140 200 m t on powerpath turn-on time v in = 3.6v, from enb falling to i out ramp starting 11 s t off powerpath turn-off time v in = 3.6v, from enb rising with i in = 100ma falling to 0ma 2s short-circuit response i oc current limit v ina or b = 3.6v (note 5) 1.8 a i qoc quiescent current while in overcurrent operation v ina or b = 3.6v, i out = 1.8a (note 5) 100 130 a stat output i soff stat off current shut down l C1 0 1 a i son stat sink current v in > v out , v ctl < v il , t j < 135c, i out < i max l 71115 a t s(on) stat pin current turn-on time v in = 3.6v, from enb falling 1.8 s t s(off) stat pin current turn-off time v in = 3.6v, from enb rising 0.8 s enb inputs v enbih enb inputs rising threshold voltage v enb rising l 540 600 mv v enbil enb inputs falling threshold voltage v enb falling l 400 460 mv v enbhyst enb input hysteresis v enbhyst = (v enbih C v enbil )90mv i enb enb inputs pull-down current v out < v in = 3.6v, v enb < v il l 234 a ovi input (ltc4413-2 only) v ovih ovi input rising threshold voltage v ovi rising 5.9 6.2 v v ovil ovi input falling threshold voltage v ovi falling 5.4 5.6 v v ovid ovi-ovp voltage drop v ovi = 8v, no load at ovp 100 mv i ovi ovi bias current v ovi = 8v 80 a note 1: stresses beyond those listed under absolute maximum ratings may cause permanent damage to the device. exposure to any absolute maximum rating condition for extended periods may affect device reliability and lifetime. note 2: the ltc4413-1/ltc4413-2 are guaranteed to meet performance speci? cations from 0c to 85c. speci? cations over the C40c to 85c operating temperature range are assured by design, characterization and correlation with statistical process controls. note 3: quiescent current increases with diode current: refer to plot of i qf vs i out . note 4: this ic includes overtemperature protection that is intended to protect the device during momentary overload conditions. overtemperature protection will become active at a junction temperature greater than the maximum operating temperature. continuous operation above the speci? ed maximum operating junction temperature may impair device reliability. note 5: speci? cation is guaranteed by correlation to wafer-level measurements. note 6: unless otherwise speci? ed, current into a pin is positive and current out of a pin is negative. all voltages referenced to gnd.
ltc4413-1/ltc4413-2 4 441312fd typical performance characteristics i qf vs i load (log) i qf vs i load (linear) i qf vs temperature i oc vs temperature uvlo thresholds vs temperature uvlo hysteresis vs temperature enb thresholds vs temperature enb hysteresis vs temperature load (ma) 40 i qf (a) 80 120 20 60 100 1 100 1000 10000 441312 g01 0 10 120c C40c 80c 40c 0c load (ma) 0 0 i qf (a) 20 40 60 80 120 500 1000 1500 2000 441312 g02 2500 3000 100 120c 80c 40c C40c 0c temperature (c) C40 0 i qf (a) 20 40 60 80 1a 500ma 100ma 1ma 100 120 0 40 80 120 441312 g03 v in (v) 2 i qf (a) 50 60 70 6 441312 g04 40 30 0 3 4 5 2.5 3.5 4.5 5.5 20 10 90 80 i qf = 1a i qf = 100ma i qf vs v in temperature (c) C40 2000 2500 3500 80 441312 g05 1500 1000 0 40 120 500 0 3000 i oc (ma) temperature (c) C40 2.05 2.10 2.20 80 441312 g06 2.00 1.95 0 40 120 1.90 1.85 2.15 rising falling uvlo thresholds (v) temperature (c) C40 uvlo hysteresis (mv) 150 200 250 20 60 120 441312 g07 100 50 0 C20 0 40 80 100 temperature (c) C40 0 enbih/enbil (mv) 100 200 300 400 500 enbih enbil 600 0 40 80 120 441312 g08 temperature (c) C40 0 enb hysetersis (mv) 20 40 60 80 040 80 120 441312 g09 100 120 C20 20 60 100
ltc4413-1/ltc4413-2 5 441312fd r fwd vs v in and i load = 500ma typical performance characteristics v fwd and r fwd vs i load (linear) r fwd and v fwd vs i load (log) v fwd vs i load (log) r fwd vs temperature i leak vs temperature at v reverse = 5.5v i leak vs v reverse response to 800ma load step in <16s enb turn-on, 30s to turn on with 180ma load ch1 = in 100mv/div 4s/div 441312 g17 ch2 out 100mv/div ch4 i out 200mv/div ch1 in 1v/div ch3 enb 1v/div 10s/div 441312 g18 ch2 out 1v/div ch4 i out 200mv/div v in (v) 2 60 r fwd 500ma (m) 62 66 68 70 80 74 3 4 4.5 441312 g10 64 76 78 72 2.5 3.5 5 5.5 6 load (ma) 0 0 r fwd (m) v fwd (mv) 100 200 300 400 500 0 50 100 150 200 250 500 1000 1500 2000 441312 g11 2500 3000 120c 80c 40c 0c C40c v fwd r fwd load (ma) 1 0 r fwd (m) v fwd (mv) 100 200 300 400 500 600 0 50 100 150 200 250 300 10 100 1000 10000 441312 g12 120c 80c 40c 0c C40c r fwd v fwd load (ma) 50 v fwd (mv) 100 150 200 250 1 100 1000 10000 441312 g13 0 10 120c 80c 40c 0c C40c temperature (c) C40 0 r fwd (m) 20 40 60 80 100 100ma 500ma 1a 120 0 40 80 120 441312 g14 temperature (c) 0.001 i leak (a) 0.01 C40 40 80 441312 g15 0.0001 0 C20 60 100 20 12 0 0.00001 0.1 1 5.5v 3.6v v reverse (v) 0 0.00001 i leak (a) 1 10 100 24 1356 441312 g16 0.1 0.01 0.001 0.0001 120c 80c 40c 0c C40c
ltc4413-1/ltc4413-2 6 441312fd typical performance characteristics ef? ciency vs load current power loss vs load current overvoltage thresholds vs temperature (ltc4413-2 only) overvoltage hysteresis vs temperature (ltc4413-2 only) ovi current vs voltage (ltc4413-2 only) ovi-ovp voltage drop vs ovi voltage (ltc4413-2 only) i q ovi vs temperature (ltc4413-2 only) ovi-ovp vs temperature (ltc4413-2 only) enb turn-off, 2s to disconnect in from 180ma load ch1 in 1v/div ch3 enb 1v/div 4s/div 441312 g19 ch2 out 1v/div ch4 i in 100mv/div load (ma) 93 efficiency (%) 99 100 92 91 98 95 97 96 94 1 100 1000 10000 441312 g20 90 10 120c 80c 40c 0c C40c load (ma) 1 0 power loss (mw) 10 1000 100 10 1000 1000 0 441312 g21 1 100 120c 80c 40c 0c C40c temperature (c) C40 5.8 6.0 6.4 80 441312 g22 5.6 5.4 0 40 120 5.2 5.0 6.2 ovpih/ovpil (v) ovp rising ovp falling temperature (c) C40 ovp hysteresis (mv) 200 250 300 120 441312 g23 150 100 0 0 40 80 50 400 350 v ovi (v) 0 80 100 140 610 441312 g24 60 40 24 812 20 0 120 i ovi (a) t a = 25c ovi (v) 0 3 4 6 610 441312 g25 2 1 24 812 0 5 ovp (v) t a = 25c temperature (c) C40 i q ovi (a) 100 120 140 120 441312 g26 80 60 0 0 40 80 40 20 180 160 i q ovi = 13v i q ovi = 6.5v temperature (c) C40 ovi-ovp (mv) 80 120 120 441312 g27 40 0 0 40 80 C20 20 60 100 160 60 100 20 140 v ohovp = 13v v ohovp = 6.5v
ltc4413-1/ltc4413-2 7 441312fd pin functions ina (pin 1): primary ideal diode anode and positive power supply for ltc4413-1/ltc4413-2. bypass ina with a ce- ramic capacitor of at least 1f. (series 1 snub resistors and higher valued capacitances are recommended when large inductances are in series with this input.) this pin can be grounded when not used. limit slew rate on this pin to less than 2.5v/s. enba (pin 2): enable low for diode a. pull this pin high to shut down this power path. tie to gnd to enable. refer to table 1 for mode control functionality. this pin can be left ? oating, a weak (3.5a) pull-down internal to ltc4413-1/ltc4413-2 is included. gnd (pin 3): power ground for the ic. enbb (pin 4): enable low for diode b. pull this pin high to shut down this power path. tie to gnd to enable. refer to table 1 for mode control functionality. this pin can be left ? oating, a weak (3.5a) pull-down internal to ltc4413-1/ltc4413-2 is included. inb (pin 5): secondary ideal diode anode and positive power supply for ltc4413-1/ltc4413-2. bypass inb with a ceramic capacitor of at least 1f. (series 1 snub resistors and higher valued capacitances are recommended when large inductances are in series with this input.) this pin can be grounded when not used. limit slew rate on this pin to less than 2.5v/s. outb (pin 6): secondary ideal diode cathode and output of the ltc4413-1/ltc4413-2. bypass outb with a high (1m min) esr ceramic capacitor of at least 4.7f. this pin must be left ? oating when not in use. limit slew rate on this pin to less than 2.5v/s. ovp (pin 7, ltc4413-2 only): drive output for an exter- nal ovp switch pmos transistor (to inhibit overvoltage wall adapter voltages from damaging device.) during overvoltage conditions, this output will remain high so long as an overvoltage condition persists. this pin must be left ? oating when not in use. ovi (pin 8, ltc4413-2 only): sense input for overvoltage protection block. this pin can be left ? oating or grounded when not used. stat (pin 9): status condition indicator. weak (11a) pull-down current output. when terminated, high indicates diode conducting. refer to table 2 for the operation of this pin. this pin can also be left ? oating or grounded. outa (pin 10): primary ideal diode cathode and output of the ltc4413-1/ltc4413-2. bypass outa with a high (1m min) esr ceramic capacitor of at least 4.7f. this pin must be left ? oating when not in use. limit slew rate on this pin to less than 2.5v/s. exposed pad (pin 11): signal ground. this pin must be soldered to pcb ground to provide both electrical contact to ground and good thermal contact to pcb.
ltc4413-1/ltc4413-2 8 441312fd block diagram + C 1 10 + C + C over current ina enba + C v off aena v gatea pa pb aena over temp outa 9 stat + C a 0.5v ena 3 gnd bena 11a 3a over temp stb uvlo ena enb outa (max) outb (max) + C 5 6 + C + C enb over current inb 4 enbb + C v off bena 6v v gateb outb 8 ovi 441312 bd ltc4413-2 only overvoltage protection 7 ovp + C b 0.5v + C 3a 2
ltc4413-1/ltc4413-2 9 441312fd operation the ltc4413-1/ltc4413-2 are described with the aid of the block diagram. operation begins when the power source at v ina or v inb rises above the undervoltage lockout (uvlo) voltage of 2.4v and the corresponding control pin enba or enbb is low. if only the voltage at the v ina pin is present, the internal power source (v dd ) is supplied from the v ina pin. the ampli? er (a) pulls a current proportional to the difference between v ina and v outa from the gate (v gatea ) of the internal pfet (pa), driving this gate voltage below v ina . this turns on pa. as v outa pulls up to a forward voltage drop (v fwd ) of 15mv below v ina , the ltc4413 regulates v gatea to maintain the small forward voltage drop. the system is now in forward regulation and the load at v outa is powered from the supply at v ina . as the load current varies, v gatea is controlled to maintain v fwd until the load current exceeds the transistors (pa) ability to deliver the current as v gatea approaches gnd. at this point, the pfet behaves as a ? xed resistor, r on , whereby the forward voltage increases slightly with increased load current. as the magnitude of i out increases further, (such that i load > i oc ) the ltc4413-1/ltc4413-2 ? xes the load current to the constant value i oc to protect the device. the characteristics for parameters r fwd , r on , v fwd and i oc are speci? ed with the aid of figure 1, illustrating the ltc4413-1/ltc4413-2 forward voltage drop versus that of a schottky. if another supply is provided at v inb , the ltc4413-1/ ltc4413-2 likewise regulate the gate voltage on pb to maintain the output voltage, v outb , just below the input voltage v inb . if this alternate supply, v inb , exceeds the voltage at v ina , the ltc4413-1/ltc4413-2 selects this input voltage as the internal supply (v dd ). this second ideal diode operates independently of the ? rst ideal diode function. when an alternate power source is connected to the load at v outa (or v outb ), the ltc4413-1/ltc4413-2 sense the increased voltage at v outa , and ampli? er a increases the voltage v gatea , reducing the current through pa. when v outa is higher than v ina + v rto , v gatea will be pulled up to v dd , turning off pa. the internal power source for the ltc4413-1/ltc4413-2 (v dd ) then diverts to draw current from the v outa pin, only if v outa is larger than v inb (or v outb ). the system is now in the reverse turn-off mode. power to the load is being delivered from an alternate supply, and only a small current (i leak ) is drawn from or sourced to v ina to sense the potential at v ina . when the selected channel of the ltc4413-1/ltc4413-2 is in reverse turn-off mode or both channels are disabled, the stat pin sinks 11a of current (i son ) if connected. channel selection is accomplished using the two enb pins, enba and enbb. when the enba input is asserted (high), pa has its gate voltage pulled to v dd , turning off pa. a 3.5a pull-down current on the enb pins ensures a low level at these inputs if left ? oating. forward voltage (v) 0 0 current (a) i oc i fwd ltc4413-1 ltc4413-2 slope: 1/r on v fwd 441312 f01 slope: 1/r fwd 1n5817 figure 1. the ltc4413 vs the 1n5817
ltc4413-1/ltc4413-2 10 441312fd operation overcurrent and short-circuit protection during an overcurrent condition, the output voltage droops as the load current exceeds the amount of current that the ltc4413-1/ltc4413-2 can supply. at the time when an overcurrent condition is ? rst detected, the ltc4413-1/ ltc4413-2 take some time to detect this condition before reducing the current to i oc . for short durations after the output is shorted, until toc, the current may exceed i oc . the magnitude of this peak short-circuit current can be large depending on the load current immediately before the short-circuit occurs. during overcurrent operation, the power consumption of the ltc4413-1/ltc4413-2 is large, and is likely to cause an overtemperature condition as the internal die temperature exceeds the thermal shutdown temperature. overtemperature protection the overtemperature condition is detected when the internal die temperature increases beyond 150c. an overtemperature condition will cause the gate ampli? ers (a and b) as well as the two p-channel mosfets (pa and pb) to shut off. when the internal die temperature cools to below 140c, the ampli? ers turn on and the ltc4413-1/ltc4413-2 reverts to normal operation. note that prolonged operation under overtemperature condi- tions degrades reliability. overvoltage protection (ltc4413-2 only) an overvoltage condition is detected whenever the overvoltage input (ovi) pin is pulled above 6v. the con- dition persists until the ovi voltage falls below 5.6v. the overvoltage protection (ovp) output is low unless an overvoltage condition is detected. if an overvoltage condi- tion is present, the ovp output is pulled up to the voltage applied to the ovi input. this output signal can be used to enable or disable an external pfet that is placed between the input that is the source of the excessive voltage and the input to the ltc4413-2, thus eliminating the potential damage that may occur to the ltc4413-2 if its input volt- age exceeds the absolute maximum voltage of 6v. see the applications information section dual battery load sharing with automatic switchover to a wall adapter with overvoltage protection for more information on using the overvoltage protection function within the ltc4413-2. channel selection and status output two active-high control pins independently turn off the two ideal diodes contained within the ltc4413-1/ltc4413-2, controlling the operation mode as described by table 1. when the selected channel is reverse biased, or the ltc4413-1/ltc4413-2 is put into low power standby, the status signal indicates this condition with a low voltage. table 1. mode control enb1 enb2 state low low diodeor nb: the two outputs are not connected internal to the device low high diode a = enabled, diode b = disabled high low diode a = disabled, diode b = enabled high high all off (low power standby) the function of the stat pin depends on the mode that has been selected. table 2 describes the stat pin output current, as a function of the mode selected as well as the conduction state of the two diodes. table 2. stat output pin function enb1 enb2 conditions stat low low diode a forward bias, diode b forward bias i snk = 0a diode a forward bias, diode b reverse bias i snk = 0a diode a reverse bias, diode b forward bias i snk = 11a diode a reverse bias, diode b reverse bias i snk = 11a low high diode a forward bias, diode b disabled i snk = 0a diode a reverse bias, diode b disabled i snk = 11a high low diode a disabled, diode b forward bias i snk = 0a diode a disabled, diode b reverse bias i snk = 11a high high diode a disabled, diode b disabled i snk = 11a
ltc4413-1/ltc4413-2 11 441312fd applications information introduction the ltc4413-1/ltc4413-2 are intended for power control applications that include low loss diode oring, fully auto- matic switchover from a primary to an auxiliary source of power, microcontroller controlled switchover from a pri- mary to an auxiliary source of power, load sharing between two or more batteries, charging of multiple batteries from a single charger and high side power switching. dual battery load sharing with automatic switchover to a wall adapter with overvoltage protection (ltc4413-2 only) an application circuit for dual battery load sharing with automatic switchover of load from batteries to a wall adapter is shown in figure 2. when the wall adapter is not present, whichever battery has the higher voltage provides the load current until it has discharged to the voltage of the other battery. the load is shared between the two batter- ies according to the capacity of each battery. the higher capacity battery provides proportionally higher current to the load. when a wall adapter input is applied, the output voltage rises as the body diode in mp2 conducts. when the output voltage is larger than the battery voltages, the ltc4413 turns off and very little load current is drawn from the batteries. at this time, the stat pin pulls down the gate voltage of mp2, causing it to conduct. this status signal can be used to provide information as to whether the wall adapter (or batb) is supplying the load current. if the wall adapter voltage exceeds the ovi trip threshold (v ovih ) then the wall adapter is disconnected via the external pfet, mp1. the ovi voltage can be monitored (through a voltage divider if necessary) to determine if an overvoltage condition is present. capacitor c2 is required to dynamically pull up on the gate of pfet mp1 if a fast edge occurs at the wall adapter input during a hot plug. in the event that capacitor c2 (or the gate-to-source of mp1) is precharged below the ovi rising threshold. when a high voltage spike occurs, the ovp output cannot guarantee turning off mp1 before the load voltage exceeds the absolute maximum voltage for the ltc4413-2. this may occur in the event that the wall adapter suddenly steps from 5.5v to a much higher value. in this case, a zener diode is recommended to keep the output voltage to a safe level. automatic powerpath control figure 3 illustrates an application circuit for microcon- troller monitoring and control of two power sources. the microcontrollers analog inputs (perhaps with the aid of a resistor voltage divider) monitor each supply input and the ltc4413-1 status, and then commands the ltc4413-1 through the two enba/enbb control inputs. ina ideal mp1 irlml6402 mp2 irlml6402 ltc4413-2 inb ideal batb enba c1: c1206c106k8pac c2: c0403c103k8pac c out : c1206c475k8pac gnd enbb outa 1 3 4 5 2 10 8 7 6 9 outb stat c out 4.7 f c2 10nf optional 6.2v dflz6v2-7 441312 f02 stat r stat 470k ovp to load ovi ovp + bata 10nf c1 0.10f wall adapter input jack r1 1 + ina ideal ltc4413-1 inb ideal enba gnd enbb outa outb stat stat 441312 f03 load 1 2 3 4 5 10 9 6 c a 10f primary power source auxiliary power source r a 1 r stat 470k c b 10f c1 4.7f r b 1 microcontroller figure 2 figure 3
ltc4413-1/ltc4413-2 12 441312fd automatic switchover from a battery to an auxiliary supply, or a wall adapter with overvoltage protection figure 4 illustrates an application circuit where the ltc4413-2 is used to automatically switch over between a battery, an auxiliary power supply and a wall adapter. when the battery is supplying load current, ovp is at gnd and stat is high. if a higher supply is applied to aux, the bat will be disconnected from the load and the load is powered from aux. when a wall adapter is applied, the body diode of mp2 forward biases. when the load voltage exceeds the aux (or bat) voltage, the ltc4413-2 senses this higher voltage and disconnects aux (or bat) from the load. at the same time it pulls the stat voltage to gnd, thereby turning on mp2. the load current is now supplied from the wall adapter. if the wall adapter voltage exceeds the ovi rising threshold, the ovp voltage rises and turns off mp1, disconnecting the wall adapter from the load. the output voltage collapses down to the aux (or bat) voltage and the ltc4413-2 reconnects the load to aux (or bat). applications information capacitor c2 is required to dynamically pull up on the gate of mp1 if a fast edge occurs at the wall adapter input during a hot plug. if the wall adapter voltage is precharged when an overvoltage spike occurs, the ovp voltage may not discharge capacitor c2 in time to protect the output. in this event, a zener diode is recommended to protect the output node until mp1 is turned off. multiple battery charging figure 5 illustrates an application circuit for automatic dual battery charging from a single charger. whichever battery has the lower voltage will receive the larger charging cur- rent until both battery voltages are equal, then both are charged. while both batteries are charging simultaneously, the higher capacity battery gets proportionally higher cur- rent from the charger. for li-ion batteries, both batteries achieve the ? oat voltage minus the forward regulation voltage of 15mv. this concept can apply to more than two batteries. the stat pin provides information as to when the battery at outa is being charged. for intelligent control, the enba/enbb input pins can be used with a microcontroller as shown in figure 3. ina ideal mp1 irlml6402 mp2 irlml6402 ltc4413-2 inb ideal enba c1: c1206c106k8pac c2: c0403c103k8pac c out : c1206c475k8pac gnd enbb outa 1 4 5 2 aux 470k 470k 3 10 7 9 6 8 outb stat c out 4.7 f c2 10nf 441312 f04 stat r stat 560k ovp to load ovi ovp bat c1 0.10f wall adapter input jack r1 1 + optional 6.2v dflz6v2-7 10nf ina ideal ltc4413-1 inb ideal enba gnd enbb outa 1 3 4 5 2 10 stat is high when bat1 is charging v cc 9 470k bat2 6 outb stat battery charger input 441312 f05 load load + bat1 + figure 4 figure 5
ltc4413-1/ltc4413-2 13 441312fd applications information automatic switchover from a battery to a wall adapter and charger with overvoltage protection figure 6 illustrates the ltc4413-2 performing the function of automatically switching a load over from a battery to a wall adapter while controlling an ltc4059 battery charger. when no wall adapter is present, the ltc4413-2 connects the load at outa from the li-ion battery at ina. in this condition, the stat voltage is high, thereby disabling the battery charger. if a wall adapter of a higher voltage than the battery is connected to mp1 (but below the ovi threshold), the load voltage rises as the second ideal di- ode conducts. as soon as the outa voltage exceeds the ina voltage, the bat is disconnected from the load and the stat voltage falls, turning on the ltc4059 battery charger and beginning a charge cycle. if a high voltage wall adapter is inadvertently attached above the ovi rising threshold, the ovp pin voltage rises, disconnecting both the ltc4413-2 and the ltc4059 from potentially hazard- ous voltages. when this occurs, the load voltage collapses until it is below the bat voltage causing the stat voltage to rise, disabling the battery charger. at the same time, the ltc4413-2 automatically reconnects the battery to the load. one major bene? t of this circuit is that when a wall adapter is present, the user may remove the battery and replace it without disrupting the load. capacitor c2 is required to dynamically pull up on the gate of mp1 if a fast edge occurs at the wall adapter input during a hot plug. if the wall adapter voltage is precharged when an overvoltage spike occurs, the ovp voltage may not discharge capacitor c2 in time to protect the output. in this event, a zener diode is recommended to protect the output node until mp1 is turned off. ina ideal ltc4413-2 inb ovp ovi ideal enba enbb gnd 100k d1 optional dflz6v2-7 outa li-ion 1 4 3 5 2 10 9 r stat 560k 6 outb stat 441312 f06 to load stat c out 4.7f c1 10f 1f c2 10nf + bat prog gnd enb v cc ltc4059 li/cc mp1 irlml6402 wall adapter input jack figure 6
ltc4413-1/ltc4413-2 14 441312fd soft-start overvoltage protection in the event that a low power external pfet is used for the external overvoltage protection device, care must be taken to limit the power dissipation in the external pfet. the operation of this circuit is identical to the automatic switchover from a battery to a wall adapter application shown on the ? rst page of this data sheet. here, however, the ideal diode from ina to inb is disabled by pulling up on enba whenever an overvoltage condition is detected. this channel is turned-off using a resistor connected to ovp along with a 5.6v zener diode, ensuring the abso- lute maximum voltage at enba is not exceeded during an overvoltage event. when the overvoltage condition ends, the ovp voltage drops slowly, depending on the gate charge of the external pfet. this causes the external pfet to linger in a high r ds(on) region where it can dis- sipate a signi? cant amount of heat depending on the load current. to avoid dissipating heat in the external pfet, this application delays turning on the ideal diode from ina to outa, until the gate voltage of the external pfet drops below v enbil , where the external pfet should safely be out of the high r ds(on) region. this soft-start scheme can be used on either channel of the ltc4413-2. applications information ina ideal fdr8508 ltc4413-2 inb ideal bat d2 5.6v enba gnd enbb outa outb stat r stat 470k c out 4.7 f 441312 f07 stat stat is high when wall adapter is supplying load current ovp is high when wall adapter voltage > 6v c1: c0805c106k8pac c2: c0403c103k8pac c out : c1206c475k8pac ovp to load v cc ovi ovp + c1 10f c2 10nf d1 optional wall adapter input 1 0.1f r enba 560k figure 7
ltc4413-1/ltc4413-2 15 441312fd 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 representa- tion that the interconnection of its circuits as described herein will not infringe on existing patent rights. package description dd package 10-lead plastic dfn (3mm 3mm) (reference ltc dwg # 05-08-1699 rev b) 3.00 p 0.10 (4 sides) note: 1. drawing to be made a jedec package outline m0-229 variation of (weed-2). check the ltc website data sheet for current status of variation assignment 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 0.40 p 0.10 bottom viewexposed pad 1.65 p 0.10 (2 sides) 0.75 p 0.05 r = 0.125 typ 2.38 p 0.10 (2 sides) 1 5 10 6 pin 1 top mark (see note 6) 0.200 ref 0.00 C 0.05 (dd) dfn rev b 0309 0.25 p 0.05 2.38 p 0.05 (2 sides) recommended solder pad pitch and dimensions 1.65 p 0.05 (2 sides) 2.15 p 0.05 0.50 bsc 0.70 p 0.05 3.55 p 0.05 package outline 0.25 p 0.05 0.50 bsc
ltc4413-1/ltc4413-2 16 441312fd linear technology corporation 1630 mccarthy blvd., milpitas, ca 95035-7417 (408) 432-1900 fax: (408) 434-0507 www.linear.com ? linear technology corporation 2006 lt 0909 rev d ? printed in usa related parts part number description comments ltc1558/ltc1559 backup battery controller with programmable output adjustable backup voltage from 1.2v nicd button cell, includes boost converter ltc1998 2.5a, 1% accurate programmable battery detector adjustable trip voltage/hysteresis, thinsot? ltc4054 800ma standalone linear li-ion battery charger with thermal regulation in thinsot no external mosfet, sense resistor or blocking diode required, charge current monitor for gas guaging, c/10 charge termination ltc4350 hot swappable load share controller allows n + 1 redundant supply, equally loads multiple power supplies connected in parallel ltc4411 2.6a low loss ideal diode in thinsot no external mosfet, automatic switching between dc sources, simpli? ed load sharing ltc4412/ltc4412hv powerpath controller in thinsot more ef? cient than diode oring, automatic switching between dc sources, simpli? ed load sharing, 3v v in 28v, 3v v in 36v (hv) ltc4413 dual 2.6a, 2.5v to 5.5v, ideal diodes in 3mm 3mm dfn lower quiescent current with slower response time ltc4414 36v, low loss powerpath controller for large pfets drives large q g pfets, very low loss replacement for power supply oring diodes, 3.5v to 36v ac/dc adapter voltage range, 8-lead msop package thinsot is a trademark of linear technology corporation. typical application ina ideal fdr8508 ltc4413-2 inb ideal bat d2 5.6v enba gnd enbb outa outb stat r stat 470k c out 4.7 f 441312 f07 stat stat is high when wall adapter is supplying load current ovp is high when wall adapter voltage > 6v c1: c0805c106k8pac c2: c0403c103k8pac c out : c1206c475k8pac ovp to load v cc ovi ovp + c1 10f c2 10nf d1 optional wall adapter input 1 0.1f r enba 560k automatic switchover from a battery to a wall adapter with soft-start overvoltage protection

▲Up To Search▲

Price & Availability of LTC4413EDD-2PBF

	To Download LTC4413EDD-2PBF Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .