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general description the MAX20313Cmax20316 programmable current-limit switches feature internal current limiting to prevent damage to host devices due to faulty load conditions. these current-limit switches feature a low, 10m (typ) on- resistance and operate from a +2.5v to +5.5v input voltage range. the current limit is adjustable from 500ma to 6a, making these devices ideal for charging a large load capacitor and for high-current load-switching applications. the MAX20313 and max20315 feature a continuous current-limit mode during an overcurrent event. the max20314 and max20316 feature a latchoff mode during an overcurrent event. additional safety features include thermal shutdown protection to prevent overheating and reverse current blocking to prevent current from being driven back into the source. the devices are available in a 12-bump (0.4mm pitch, 1.68mm x 1.48mm) wafer-level package (wlp) and operate over the -40c to +85c extended temperature range. benefts and features reliable protection ? adjustable current limit (500ma to 6a) ? accurate 5% overload current limit (2a to 6a) ? current monitoring ? low r on 10m (typ) ? reverse current protection ? short-circuit protection ? thermal shutdown protection space saving ? 12-bump 0.4mm pitch 1.68mm x 1.48mm wlp applications rf power amplifers in cell phones usb ports data modem cards portable media players utca/atca platforms sdxc card power supply protection ordering information appears at end of data sheet. 19-100072; rev 0; 6/17 MAX20313Cmax20316 500ma to 6a adjustable current-limit switches
(all voltages referenced to gnd.) in, out, en, en , flag , seti ................................ -0.3v to +6v continuous current into any terminal (except in, out) ... 20ma out short circuit to gnd ................................ internally limited continuous power dissipation (t a = +70c) wlp (derate 13.73mw/c above +70c) ............... 1098.4mw operating temperature range ........................... -40c to +85c junction temperature ...................................................... +150c storage temperature range ............................ -65c to +150c soldering temperature (reflow) ....................................... +260c wlp junction-to-ambient thermal resistance ( ja ) ..... 72.82c/w (note 1) (v in = 2.5v to 5.5v, t a = -40 c to +85 c, unless otherwise noted. typical values are at v in = 4.3v, c in = 1f, c out = 1f, t a = +25 c) (note 2) parameter symbol conditions min typ max units supply operation operating voltage v in 2.5 5.5 v undervoltage lockout v uvlo 1.45 v quiescent current i q i out = 0a, switch on, (supply current comes from high voltage between in and out) 250 525 a latchoff current i latch v in = 4.3v, i out = 0a, after an overcurrent fault (max20314, max20316) 3.5 20 a shutdown forward current i shdn v en = 0v, v en = v in , v in = 5.5v, v out = 0v 3.0 20 a shutdown reverse current i rshdn v en = 0v, v en = v out , v in = 0v, v out = 5.5v 3.0 20 a internal fet switch-on resistance (note 3) r on v in = 4.3v, i out = 1a, i out < i lim , t a = +25oc 10 19 m forward current limit (note 3) i lim r seti = 675, v in = 4.3v 5700 6000 6300 ma r seti = 2063, v in = 4.3v 1900 2000 2100 r seti = 9019, v in = 4.3v 425 500 575 current limit fold back i lim_fb v in = 4.3v, v out = 0v, i lim = 1a -10 % r seti coeffcient p i lim = 500ma to 6a 3329 r seti constant c i lim = 500ma to 6a 12 ma load transient step reaction time t sr v in = v en = 4.3v, i load = 80% i lim steps to 120% i lim to fowing current within 10% i lim 60 s maxim integrated 2 note 1: package thermal resistances were obtained using the method described in jedec specification jesd51-7, using a four-layer board. for detailed information on package thermal considerations, refer to www.maximintegrated.com/thermal-tutorial . absolute maximum ratings stresses beyond those listed under absolute maximum ratings may cause permanent damage to the device. these are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. exposure to ab solute maximum rating conditions for extended periods may affect device reliability. package thermal characteristics electrical characteristics MAX20313Cmax20316 500ma to 6a adjustable current-limit switches www.maximintegrated.com
(v in = 2.5v to 5.5v, t a = -40 c to +85 c, unless otherwise noted. typical values are at v in = 4.3v, c in = 1f, c out = 1f, t a = +25 c) (note 2) note 2: all devices are 100% production tested at t a = +25c. specifications over the operating temperature range are guaranteed by design. note 3: guaranteed by design and device characterization . parameter symbol conditions min typ max units accurate reverse current blocking trigger threshold v arev_th v out - v in 1 8 25 mv accurate reverse current blocking release threshold v arev_ex v out - v in 0 7 mv accurate reverse blocking debounce time t db_arib (v out - v in ) changes from 0v to -0.02v in 100ns, the time needed to block reverse current 128 s fast reverse current blocking threshold v frev_th v out - v in 40 65 110 mv fast reverse blocking response time t frib (v out - v in ) changes from 0v to -0.3v in 100ns, the time needed to block reverse current 3 s flag assertion drop voltage threshold v fa increase (v in - v out ) drop until flag asserts, in current limit mode, v in = 4.3v 70 120 185 mv en, en input en, en input leakage i leak en, en = in or gnd -0.9 0.9 a en, en input logic-high voltage v ih 1.4 v en, en input logic-low voltage v il 0.4 v flag output flag output logic-low voltage i sink = 1ma 0.4 v flag output leakage current v in = v flag = 5.5v, flag deasserted 0.9 a timing characteristics turn-on delay t on time from en/ en signal to v out = 90% of v in , v in = 4.3v (figure 1) 2.5 4 5 ms turn-off time t off time from en/ en signal to v out = 10% of v in , v in = 4.3v, c load = 1000pf, r load = 860? (figure 1) 50 s current-limit reaction time t lim v in = 4.3v, output high and then short circuit applied, i out > 200% i lim 3 s blanking time t blank v in = 4.3v (figure 2) 12 15 18 ms thermal protection thermal shutdown 150 c thermal shutdown hysteresis 20 c temperature increase self-limitation 130 c maxim integrated 3 electrical characteristics (continued) MAX20313Cmax20316 500ma to 6a adjustable current-limit switches www.maximintegrated.com
figure 1. timing diagram for measuring turn-on time and turn-off time figure 2. latchoff fault diagram t on t off v out 10% v in 90% v in en t blank t blank flag out current limit load current the device goes to thermal-shutdown mode maxim integrated MAX20313Cmax20316 500ma to 6a adjustable current-limit switches www.maximintegrated.com
(v in = 4.3v, c in = 1f, c out = 1f, t a = +25c, unless otherwise noted.) 0 50 100 150 200 250 300 350 -40 -15 10 35 60 85 quiescent supply current (a) temperature (oc) quiescent supply current vs. t emperat ure toc04 v in = 4.3v v en = v in v in = 5v 0 2 4 6 8 10 12 -40 -15 10 35 60 85 shutdown reverse current (a) temperature (oc) shut down reverse current vs. t emperat ure toc07 v out = 5.5v, v in = 1.7v v en = 0v 2.50 2.60 2.70 2.80 2.90 3.00 3.10 3.20 3.30 3.40 3.50 2.5 3.0 3.5 4.0 4.5 5.0 5.5 current limit (a) supply voltage (v) current limit vs. supply voltage r seti = 1.3k toc01 0.95 0.96 0.97 0.98 0.99 1.00 1.01 1.02 1.03 1.04 1.05 -40 -15 10 35 60 85 normalized current limit temperature (oc) normalized current limit vs. t emperat ure toc02 current limit 1.5a 0 50 100 150 200 250 300 350 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 quiescent supply current (a) supply voltage (v) quiescent supply current vs. supply voltage v en = v in toc03 0 2 4 6 8 10 12 -40 -15 10 35 60 85 shutdown supply current (a) temperature (oc) shut down supply current vs. t emperat ure toc05 v in = 4.3v v in = 5v v en = 0v 0 2 4 6 8 10 12 -40 -15 10 35 60 85 latchoff current (a) temperature (oc) lat choff current vs. t emperat ure toc08 v en = v in v in = 4.3v v in = 5.5v max20314 0 2 4 6 8 10 12 14 -40 -15 10 35 60 85 shutdown forward current (a) temperature (oc) shut down forward current vs. t emperat ure toc06 v in = 2.3v v in = 5.5v v out = 0v, v en = 0v 0.5 0.6 0.7 0.8 0.9 1.0 1.1 1.2 1.3 1.4 1.5 2.5 3.0 3.5 4.0 4.5 5.0 5.5 normalized on - resistance supply voltage (v) normalized on - resist ance vs. supply voltage normalized to v in = 4.3v toc09 v en = v in , i load = 1a maxim integrated 5 typical operating characteristics MAX20313Cmax20316 500ma to 6a adjustable current-limit switches www.maximintegrated.com
(v in = 4.3v, c in = 1f, c out = 1f, t a = +25c, unless otherwise noted.) 0 2 0 0 4 0 0 6 0 0 8 0 0 1 0 0 0 1 2 0 0 1 4 0 0 0 1 2 3 4 5 6 se t i v o l t a g e ( m v ) o u t curr e n t ( a ) se t i v o lt a g e vs . o u t c urr e n t v i n = 3 v t o c 1 3 v i n = 4 . 3 v v i n = 5 . 5 v r se t i = 61 4 0.6 0.7 0.8 0.9 1 1.1 1.2 1.3 1.4 -40 -15 10 35 60 85 normalized on - resistance temperature (oc) normalized on - resist ance vs. t emperat ure toc10 i out = 1a 2a/div 1v/div 5v/div toc16 10ms/div i out v out current limit response (sudden short ) v seti v /flag \ 5v/div MAX20313 v in = v en = 4.3v current limit 3a 0.0 0.5 1.0 1.5 2.0 2.5 0 0.02 0.04 0.06 0.08 0.1 0.12 0.14 output current (a) v in - v out (v) out put current vs. out put voltage toc11 r seti = 2.4k r seti = 2k 0 2 0 0 4 0 0 6 0 0 8 0 0 1 0 0 0 1 2 0 0 0 1 2 3 4 5 6 se t i v o l t a g e ( m v ) o u t curr e n t ( a ) se t i v o lt a g e vs . o u t c urr e n t t o c 1 2 t a = + 25 o c t a = + 85 o c t a = - 40 o c r se t i = 61 4 10a/div 1v/div 5v/div toc17 10s/div i out v out current limit response (sudden short ) v seti v /flag \ 5v/div MAX20313 v in = v en = 4.3v current limit 3a 3.0 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 4.0 -40 -15 10 35 60 85 switch turn - on time (ms) temperature (oc) swit ch t urn - on t ime vs. t emperat ure r load = 10 toc14 v in = 4.3v v in = 5v 50 51 52 53 54 55 56 57 58 59 60 -40 -15 10 35 60 85 switch turn - off time (s) temperature (oc) swit ch t urn - off time vs. t emperat ure toc15 r load = 10 v in = 4.3v v in = 5v maxim integrated 6 typical operating characteristics (continued) MAX20313Cmax20316 500ma to 6a adjustable current-limit switches www.maximintegrated.com
(v in = 4.3v, c in = 1f, c out = 1f, t a = +25c, unless otherwise noted.) 2a/div 1v/div 5v/div toc20 10ms/div i out v out current limit response (fast load increase) v seti v /flag \ 5v/div v in = v en = 4.3v current limit 4.1a MAX20313 2a/div 1v/div 5v/div toc18 1s/div i out v out current limit response (slow load increase) v seti v /flag \ 5v/div v in = v en = 4.3v current limit 3a MAX20313 2a/div 2v/div 5v/div toc19 4ms/div i out v out current limit response (slow load increase) v seti v /flag \ 5v/div MAX20313 v in = v en = 4.3v current limit 3a 2a/div 5v/div 1v/div toc21 4ms/div i out v out flag response (overload condit ion) v seti v flag 5v/div MAX20313 v in = v en = 4.3v current limit 3a sudden short maxim integrated 7 typical operating characteristics (continued) MAX20313Cmax20316 500ma to 6a adjustable current-limit switches www.maximintegrated.com
top view ( bumps on bottom ) flag in seti out max 20313 / max 20314 1 2 a b in out c out en in 3 4 in gnd out flag in seti out max20315/max20316 1 2 a b in out c out en in 3 4 in gnd out maxim integrated 8 bump confgurations MAX20313Cmax20316 500ma to 6a adjustable current-limit switches www.maximintegrated.com
bump name function MAX20313 max20314 max20315 max20316 a1 a1 flag open-drain overcurrent indicator output. flag goes low when the overload fault duration exceeds the blanking time, reverse current is detected, or thermal shutdown mode is active. a2 a2 seti forward current-limit adjust input. connect a resistor from seti to gnd to program the overcurrent limit. if seti is connected to gnd, the device, as well as the connected circuitry, cannot be protected from an overcurrent condition. leaving seti unconnected forces the device to set an arbitrary small but uncontrolled current limitation (<100ma). a3 a3 gnd ground a4 en active-high enable input. drive en high to turn on the switch. drive en low to turn off the switch. a4 en active-low enable input. drive en low to turn on the switch. drive en high to turn off the switch. b1, b4, c1, c4 b1, b4, c1, c4 in power input. connect in together and bypass in to gnd with a 1f ceramic capacitor as close as possible to the device. if necessary, use higher capacitance to prevent large load transients from pulling down the supply voltage. b2, b3, c2, c3 b2, b3, c2, c3 out switch output. connect out together and bypass out to gnd with a 1f ceramic capacitor as close as possible to the device. maxim integrated 9 bump description MAX20313Cmax20316 500ma to 6a adjustable current-limit switches www.maximintegrated.com
detailed description the MAX20313-max20316 programmable current-limit switches operate from +2.5v to +5.5v and provide internal current-limiting adjustable from 500ma to 6a. these devices feature a fixed blanking time and a flag output that notifies the processor when a fault condition is present. programmable current-limit threshold a resistor from seti to gnd sets the current-limit threshold for the switch (see setting the current-limit threshold and current monitoring section). if the output current is limited at the current threshold value for a time equal to, or longer than, t blank with v in - v out higher than the flag assertion drop-voltage threshold (v fa ), the flag asserts and the MAX20313/max20315 enter continuous current-limit mode, and the max20314/max20316 latch off the switch. continuous current limit (MAX20313/max20315) when the forward current reaches the forward current threshold, the MAX20313/max20315 limit the output current to the programmed current limit. flag asserts if the current limit is present for t blank , and deasserts when the overload condition is removed. in this mode, if the die temperature reaches +130c (typ) due to self-heating, the part will prevent itself from consuming more power than what can be dissipated through the thermal resistance of the package. the average current limitation will be lowered automatically to a sustainable value given the thermal design. if current limitation is not the cause and the temperature continues to rise exceeding +150c (typ), the device will go into thermal shutdown mode until the die temperature drops by approximately 20c. MAX20313 max20314 max20315 max20316 buffer control logic current limit bandgap reference timing circuitry buffer thermal shutdown out in en/en en: MAX20313, max20314 en: max20315, max20316 flag seti reverse-current protection maxim integrated 10 functional diagram MAX20313Cmax20316 500ma to 6a adjustable current-limit switches www.maximintegrated.com
latchoff (max20314/max20316) when the forward current reaches the current threshold, the t blank timer begins counting ( figure 2 ). flag asserts if an overcurrent condition is present for greater than t blank time. the timer resets if the overcurrent condition disappears before t blank has elapsed. the switch turns off if the overcurrent condition continues beyond the blanking time. reset the switch by either toggling the control logic (en/ en ) or by cycling the input voltage. if the die temperature reaches +130c (typ) due to self-heating, the part will prevent itself from consuming more power than what can be dissipated through the thermal resistance of the package. the average current limitation will be lowered automatically to a sustainable value given the thermal design. if current limitation is not the cause and the temperature continues to rise exceeding +150c (typ), the device will go into thermal shutdown mode until the die temperature drops by approximately 20c. current limit fold back the devices feature a natural current limit fold back behavior once the current limit level is reached. the current limit fold back value is typically 10% of the current limit set through the seti resistor and is slightly dependent on die temperature and the voltage drop between in and out. if the overcurrent fault is so severe that the power dissipated by the part makes it exceed the temperature increase self-limitation (130c, typ) or that the out voltage falls below 1.8v, additional safe over-limitation circuitry is triggered and the average current limit of the part is further decreased even possibly to a very low and safe value. for the continuous option, to resume normal operation after an overcurrent fault, the load current needs to fall below the actual current limitation set by the part including fold back and eventual safe over-limitation. switch enable control the en/ en controls the switch ( table 1 ). reverse-current protection the devices feature a reverse-current protection circuit that turns the switch off when higher out voltage than in voltage is sensed. the switch turns off and flag asserts after accurate reverse blocking debounce time (t db_arib ) in response to a lower threshold reverse fault (v arev_th ) or fast reverse blocking response time (t frib ) in case of a higher threshold reverse fault (v frev_th ). flag indicator flag is an open drain fault indicator output and requires an external pullup resistor to a dc supply. flag goes low when any of the following conditions occur: an overcurrent condition after the blanking time has elapsed and v in C v out > v fa the reverse-current protection has tripped the die temperature exceeds +150c (typ) temperature increase self-limitation if the die temperature reaches +130c, the device will prevent itself from consuming more power than what can be dissipated by the thermal resistance of the package. the feature imposes a thermal control loop between temperature and current limit level lowering the flowing current through the part when junction temperature try to rise above +130c. because of that, thermal design of the board has an impact on loop behavior: the average limited current is always reduced to the appropriate safe level for any thermal design but the current limit may oscillate as in auto-retry mode across the average level when the thermal resistance of the board is high. thermal shutdown thermal shutdown circuitry protects the devices from overheating. the switch turns off and flag goes low immediately when the junction temperature exceeds +150c (typ). the MAX20313/max20315 switches turn on again after the device temperature drops by approximately 20c (typ). table 1. switch truth table MAX20313 max20314 max20315 max20316 switch status en en 0 1 off 1 0 on maxim integrated 11 MAX20313Cmax20316 500ma to 6a adjustable current-limit switches www.maximintegrated.com
applications information setting the current-limit threshold and current monitoring connect a resistor between seti and ground to program the current limit threshold value for the devices. table 2 shows current limit thresholds for different resistor values at seti. use the following formula to calculate the current limit: seti lim 1.224(v) p r () i (a) c(a) ?= ? do not use a r seti value smaller than 675. a current mirror is implemented with a current sense auto- zero operational amplifier. the mirrored current of the in-out fet is provided on the seti pin. therefore, the voltage (v seti ) read on the seti pin can be interpreted as the current through the in-out fet as below: seti in out seti seti v (v) p i (a) i (a) p c(a) c(a) r () ? = + = + ? note: the current monitor feature does not provide valid information if the device is performing safe current over- limitation (die temperature > 130c (typ) or out voltage < 1.8v, see current limit fold back section). in bypass capacitor connect a minimum 1f capacitor from in to gnd to limit the input voltage drop during momentary output short- circuit conditions. if the power supply cannot support the required short-circuit current, a larger capacitor should be used to maintain the input voltage above 2.5v. if the supply is not strong enough and the user does not want to use a larger capacitor at the input, the following circuitry can be used ( figure 3 ). out bypass capacitor for stable operation over the full temperature range and over the full programmable current-limit range, use a 1f ceramic capacitor from out to ground. excessive output capacitance can cause a false overcurrent condition due to decreased dv/dt across the capacitor. use the following formula to calculate the maximum capacitive load (c max ) on out: lim blank(min) max in i (ma) t (ms) c (f) v (v) = for example, for v in = 5v, t blank(min) = 10ms, and i lim = 1000ma, c max equals 2000f. layout and thermal dissipation to optimize the switch response time to output short- circuit conditions, it is very important to keep all traces as short as possible to reduce the effect of undesirable parasitic inductance. place input and output capacitors as close as possible to the device (should be no more than 5mm). in and out must be connected with wide short traces to the power bus. during normal operation, the power dissipation is small and the package temperature change is minimal. if the output is continuously shorted to ground, the power dissipation for the MAX20313/ max20315 continuous current limit version can cause the device to reach the thermal shutdown threshold. table 2. current limit threshold vs. resistor values figure 3. optional protection for weak supply r seti () current limit (a) 9019 0.5 4247 1.0 2777 1.5 2063 2.0 1641 2.5 1363 3.0 1165 3.5 1017 4.0 903 4.5 812 5.0 737 5.5 675 6.0 *i f v in > 3v, a d i o d e can b e u s e d i n p l a c e o f th e r e s i s to r. r s e t i e n /en i n o u t fl a g s e ti g n d 1 f l o a d MAX20313 max20314 max20315 max20316 ~1 0 0?* maxim integrated 12 MAX20313Cmax20316 500ma to 6a adjustable current-limit switches www.maximintegrated.com
+ denotes a lead(pb)-free/rohs-compliant package. t = tape and reel. *future productcontact maxim for availability. part overcurrent response en polarity top mark temp range pin- package MAX20313 ewc+t continuous active-high adt -40c to +85c 12 wlp max20314 ewc+t* latchoff active-high adu -40c to +85c 12 wlp max20315 ewc+t* continuous active-low adv -40c to +85c 12 wlp max20316 ewc+t* latchoff active-low adw -40c to +85c 12 wlp package type package code outline no. land pattern no. 12 wlp w121k1+1 21-100118 refer to application note 1891 load power supply adc p in out seti gnd 1f 1f r seti v pullup flag en/en* en: max20315, max20316 10k? charge pump bias voltage control logic current reference MAX20313/max20314/ max20315/max20316 *en: MAX20313, max20314 maxim integrated 13 typical operating circuit ordering information/selector guide chip information process: bicmos package information for the latest package outline information and land patterns (footprints), go to www.maximintegrated.com/packages . note that a +, #, or - in the package code indicates rohs status only. package drawings may show a different suffix character, but the drawing pertains to the package regardless of rohs status. MAX20313Cmax20316 500ma to 6a adjustable current-limit switches www.maximintegrated.com
revision number revision date description pages changed 0 6/17 initial release ? 2017 maxim integrated products, inc. 14 revision history maxim integrated cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a maxim integrated product. no circuit patent licenses are implied. maxim integrated reserves the right to change the circuitry and specifcations without notice at any time. the parametric values (min and max limits) shown in the electrical characteristics table are guaranteed. other parametric values quoted in this data sheet are provided for guidance. maxim integrated and the maxim integrated logo are trademarks of maxim integrated products, inc. MAX20313Cmax20316 500ma to 6a adjustable current-limit switches for pricing, delivery, and ordering information, please contact maxim direct at 1-888-629-4642, or visit maxim integrateds website at www.maximintegrated.com.

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