max14586/MAX14590 high-current overvoltage protectors with adjustable ovlo ????????????????????????????????????????????????????????????????? maxim integrated products 1 general description the max14586/MAX14590 overvoltage protection devic - es feature a low 48m i (typ) on-resistance (r on ) internal fet and protect low-voltage systems against voltage faults up to +36v. when the input voltage exceeds the overvoltage threshold, the internal fet is turned off to prevent damage to the protected components. the overvoltage protection threshold can be adjusted with optional external resistors to any voltage between 4v and 20v. with the ovlo input set below the exter - nal ovlo select voltage, the devices automatically choose the internal accurate trip thresholds. the internal overvoltage thresholds (ovlo) are preset to 7v typical (max14586) or 15v typical (MAX14590). the devices are also protected against overcurrent events by an internal thermal shutdown. the max14586/MAX14590 are offered in a small, 8-pin tdfn package with exposed pad and operate over the -40 n c to +85 n c extended temperature range. applications smartphones tablet pcs mobile internet devices benefits and features s protect high-power portable devices ? wide operating input voltage protection from +2.2v to +36v ? 3a continuous current capability ? integrated 40m i (typ) n-channel mosfet switch s flexible overvoltage protection design ? adjustable overvoltage protection trip level ? wide adjustable ovlo threshold range from +4v to +20v ? preset internal accurate ovlo thresholds: 7v 2.9% (max14586) 15v 3.3% (MAX14590) s additional protection features increase system reliability ? soft-start to minimize in-rush current ? internal 15ms startup debounce ? thermal-shutdown protection s minimize pcb area ? 8-pin tdfn (2mm x 2mm) package typical application circuit 19-5818; rev 0; 3/11 ordering information appears at end of data sheet. for related parts and recommended products to use with this part, refer to: www.maxim-ic.com/max14586.related max14586 MAX14590 in ovlo gnd in out out r1* 1f power adapter charger pmic li-ion battery r2* *r1 and r2 are only required for adjustable ovlo; otherwise, connect ovlo to gnd . for pricing, delivery, and ordering information, please contact maxim direct at 1-888-629-4642, or visit maxims website at www.maxim-ic.com.
????????????????????????????????????????????????????????????????? maxim integrated products 2 max14586/MAX14590 high-current overvoltage protectors with adjustable ovlo (all voltages referenced to gnd.) in ........................................................................... -0.3v to +40v out ............................................................ -0.3v to (v in + 0.3v) ovlo ....................................................................... -0.3v to +6v continuous in, out current (note 1) ..................................... 3a peak in, out current (10ms) ................................................. 5a continuous ovlo current .................................................. 50 f a continuous power dissipation (t a = +70 n c) tdfn (derate 11.9mw/ n c above +70 n c) .................... 954mw operating temperature range .......................... -40 n c to +85 n c junction temperature ..................................................... +150 n c storage temperature range ............................ -65 n c to +150 n c lead temperature (soldering, 10s) ................................ +300 n c soldering temperature (reflow) ...................................... +260 n c tdfn junction-to-ambient thermal resistance ( b ja ) ....... 83.9 n c/w junction-to-case thermal resistance ( b jc ) .............. 37 n c/w absolute maximum ratings note 2: 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.maxim-ic.com/thermal-tutorial . stresses beyond those listed under absolute maximum ratings may cause permanent damage to the device. these are stress ratings only, and functional opera - tion of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. exposure to absolute maximum rating conditions for extended periods may affect device reliability. package thermal characteristics (note 2) electrical characteristics (v in = +2.2v to +36v, t a = -40 n c to +85 n c, unless otherwise noted. typical values are at v in = +5.0v and t a = +25 n c.) (note 3) note 1: continuous current limited by thermal design. parameter symbol conditions min typ max units input voltage range v in 2.2 36 v input supply current i in v in < 5v 65 120 f a in overvoltage trip level v in_ovlo v in rising max14586 6.8 7 7.2 v MAX14590 14.5 15 15.5 v in falling max14586 6.73 6.93 7.13 MAX14590 14.35 14.85 15.35 in overvoltage lockout hysteresis v in_ovlo_hys 1 % ovlo set threshold v ovlo_thresh 1.18 1.223 1.26 v adjustable ovlo threshold range 4 20 v external ovlo select threshold v ovlo_select 0.25 0.35 0.4 v switch on-resistance r on i out = 100ma, t a = +25c, v in = 5v 48 81 m i i out = 100ma, t a = -40c to +85c 115 ovlo clamp i clamp = 10 f a, v in = 5v 3.6 v out capacitor c out 1000 f f ovlo input leakage current i ovlo v ovlo_thresh = 1.221v -100 +100 na thermal shutdown +150 n c thermal shutdown hysteresis 20 n c * the parametric values (min, typ, max limits) shown in the electrical characteristics table supersede values quoted elsewhere in this data sheet.
????????????????????????????????????????????????????????????????? maxim integrated products 3 max14586/MAX14590 high-current overvoltage protectors with adjustable ovlo note 3: all specifications are 100% production tested at t a = +25 n c, unless otherwise noted. specifications are over -40 n c to +85 n c and are guaranteed by design. electrical characteristics* (continued) (v in = +2.2v to +36v, t a = -40 n c to +85 n c, unless otherwise noted. typical values are at v in = +5.0v and t a = +25 n c.) (note 3) figure 1. timing diagram parameter symbol conditions min typ max units timing characteristics (figure 1) debounce time t indbc time from 2.2v < v in < v in_ovlo to v out = 10% of v in 15 ms soft-start time t ss soft-start time beginning from v out = 10% of v in to soft-start off 15 ms switch turn-on time t on 2.2v < v in < v in_ovlo , r load = 100 i , c load = 100 f f; v out from 10% to 90% of v in 1.48 ms 2.2v < v in < v in_ovlo , r load = 100 i , c load = 1mf; v out from 10% to 90% of v in 5.24 switch turn-off time t off v in > v ovlo_thresh to v out = 80% of v in_ovlo ; r load = 100 i , v in rising at 2v/ f s 0.8 3.5 f s ovlo 2.2v in t on t on v in_ovlo t off 90% 80% v in_ovlo 10% 90% 10% t indbc t ss t ss t indbc out note: waveforms are not to scale. * the parametric values (min, typ, max limits) shown in the electrical characteristics table supersede values quoted elsewhere in this data sheet.
????????????????????????????????????????????????????????????????? maxim integrated products 4 max14586/MAX14590 high-current overvoltage protectors with adjustable ovlo typical operating characteristics (v in = +5.0v, c in = 1 f f, c out = 1 f f, t a = +25 n c, unless otherwise noted.) normalized debounce time vs. temperature max14586 toc06 temperature (c) normalized debounce time 60 35 10 -15 0.6 0.7 0.8 0.9 1.0 1.1 1.2 1.3 1.4 1.5 0.5 -40 85 normalized external ovlo select threshold vs. temperature max14586 toc05 temperature (c) normalized external ovlo select threshold 60 35 10 -15 0.6 0.7 0.8 0.9 1.0 1.1 1.2 1.3 1.4 1.5 0.5 -40 85 normalized external ovlo set threshold vs. temperature max14586 toc04 temperature (c) normalized external ovlo set threshold 60 35 10 -15 0.96 0.97 0.98 0.99 1.00 1.01 1.02 1.03 1.04 1.05 0.95 -40 85 v in = 6v normalized ovlo threshold vs. temperature max14586 toc03 temperature (c) normalized ovlo threshold 60 35 10 -15 0.96 0.97 0.98 0.99 1.00 1.01 1.02 1.03 1.04 1.05 0.95 -40 85 normalized r on vs. temperature max14586 toc02 temperature (c) normalized r on 60 35 10 -15 0.6 0.7 0.8 0.9 1.0 1.1 1.2 1.3 1.4 1.5 0.5 -40 85 i out = 100ma v in = 3.6v v in = 5v in supply current vs. in voltage max14586 toc01 in voltage (v) in supply current (a) 21 14 7 50 100 150 200 250 300 350 400 0 0 28 ovlo = gnd (max14586) t a = +85c t a = +25c t a = -40c
????????????????????????????????????????????????????????????????? maxim integrated products 5 max14586/MAX14590 high-current overvoltage protectors with adjustable ovlo typical operating characteristics (continued) (v in = +5.0v, c in = 1 f f, c out = 1 f f, t a = +25 n c, unless otherwise noted.) overvoltage fault response (i out = 0.5a, c out = 100f) max14586 toc09 10s/div 0v 0v 0ma v in 5v/div v out 5v/div i out 500ma/div power-up response (i out = 0.5a, c out = 1000f) max14586 toc08 10ms/div 0v 0v 0ma v in 5v/div v out 5v/div i out 500ma/div power-up response (i out = 0.5a, c out = 100f) max14586 toc07 10ms/div 0v 0v 0ma v in 5v/div v out 5v/div i out 500ma/div
????????????????????????????????????????????????????????????????? maxim integrated products 6 max14586/MAX14590 high-current overvoltage protectors with adjustable ovlo pin configuration pin description pin name function 1, 2 in voltage input. bypass in with a 1 f f ceramic capacitor as close as possible to the device to obtain q 15kv human body model (hbm) esd protection. connect both in pins together for proper operation. in is protected to q 2kv hbm when in is not bypassed with a capacitor to gnd. 3 ovlo external ovlo adjustment. connect ovlo to gnd when using the internal threshold. connect a resistor- divider to ovlo to set a different ovlo threshold; this external resistor-divider is completely independent from the internal threshold. 4, 5 i.c. internally connected. connect i.c. to gnd or leave i.c. unconnected. 6 gnd ground 7, 8 out output voltage. output of internal switch. connect both out pins together for proper operation. ep exposed pad. connect ep to ground. for enhanced thermal dissipation, connect ep to a copper area as large as possible. do not use ep as the only ground connection. 1 + 3 4 8 6 5 *ep *connect exposed pad to gnd. out gnd i.c. 2 7 out in ovlo i.c. in tdfn (2mm x 2mm) top view max14586 MAX14590
????????????????????????????????????????????????????????????????? maxim integrated products 7 max14586/MAX14590 high-current overvoltage protectors with adjustable ovlo detailed description the max14586/MAX14590 overvoltage protection devices feature a low on-resistance (r on ) internal fet and protect low-voltage systems against voltage faults up to +36v. if the input voltage exceeds the overvoltage threshold, the internal fet is turned off to prevent damage to the pro - tected components. the 15ms debounce time prevents false turn-on of the internal fet during startup. device operation the devices have timing logic that controls the turn-on of the internal fet. if v in < v ovlo_thresh , the internal charge pump is enabled. the charge-pump startup, after a 15ms debounce delay, turns on the internal fet (see the functional diagram ). after the debounce time, soft- start limits the fet inrush current for 15ms (typ). at any time, if v in rises above v ovlo_thresh , out is discon - nected from in. internal switch the devices incorporate an internal fet with a 48m i (typ) r on . the fet is internally driven by a charge pump that generates a necessary gate voltage above in. the internal fet can pass more than 5a inrush current. overvoltage lockout (ovlo) the max14586 has a 7v (typ) overvoltage threshold. the MAX14590 has a 15v (typ) overvoltage threshold. thermal shutdown protection the devices feature thermal shutdown circuitry. the inter - nal fet turns off when the junction temperature exceeds +150 n c (typ). the device exits thermal shutdown after the junction temperature cools by 20 n c (typ). applications information in bypass capacitor for most applications, bypass in to gnd with a 1 f f ceramic capacitor as close as possible to the device to enable q 15kv (hbm) esd protection on in. if q 15kv (hbm) esd is not required, there is no capacitor required at in. if the power source has significant inductance due to long lead length, take care to prevent overshoots due to the lc tank circuit and provide protection if necessary to prevent exceeding the +40v absolute maximum rating on in. out output capacitor the slow turn-on time provides a soft-start function that allows the devices to charge an output capacitor up to 1000 f f without turning off due to an overcurrent condition. functional diagram max14586 MAX14590 v bg reference charge pump logic control sel temperature faults in in ovlo gnd out out
????????????????????????????????????????????????????????????????? maxim integrated products 8 max14586/MAX14590 high-current overvoltage protectors with adjustable ovlo external ovlo adjustment functionality if ovlo is connected to ground, the internal ovlo com - parator uses the internally set ovlo value. if an external resistor-divider is connected to ovlo and v ovlo exceeds the ovlo select voltage (v ovlo_select ) , the internal ovlo comparator reads the in fraction fixed by the external resistor-divider. r1 = 1m i is a good starting value for minimum current consumption. since v in_ovlo , v ovlo_thresh , and r1 are known, r2 can be calculated from the following formula: in_ovlo ovlo_thresh r1 v v 1 r2 ? ? = + ? ? ? ? this external resistor-divider is completely independent from the internal resistor-divider. esd test conditions esd performance depends on a number of conditions. the devices are specified for q 15kv (hbm) typical esd resistance on in when in is bypassed to ground with a 1 f f ceramic capacitor. human body model esd protection figure 2a shows the hbm and figure 2b shows the current waveform it generates when discharged into a low-impedance state. this model consists of a 100pf capacitor charged to the esd voltage of interest, which is then discharged into the device through a 1.5k i resistor. figure 2a. human body esd test model figure 2b. human body current waveform chip information process: bicmos package information for the latest package outline information and land patterns (footprints), go to www.maxim-ic.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. ordering information/ selector guide note: all devices are specified over the -40c to +85c oper - ating temperature range. + denotes a lead(pb)-free/rohs-compliant package. t = tape and reel. * ep = exposed pad. part pin-package top mark ovlo (v) max14586 eta+t 8 tdfn-ep* bnj 7 MAX14590 eta+t 8 tdfn-ep* bnk 15 package type package code outline no. land pattern no. 8 tdfn-ep t822+2 21-0168 90-0065 charge-current- limit resistor discharge resistance storage capacitor c s 100pf r c 1m r d 1.5k high- voltage dc source device under test i p 100% 90% 36.8% t rl time t dl current waveform peak-to-peak ringing (not drawn to scale) i r 10% 0 0 amperes
maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a maxim product. no circuit patent licenses are implied. maxim reserves the right to change the circuitry and specifications without notice at any time. maxim integrated products, 120 san gabriel drive, sunnyvale, ca 94086 408-737-7600 9 ? 2011 maxim integrated products maxim is a registered trademark of maxim integrated products, inc. max14586/MAX14590 high-current overvoltage protectors with adjustable ovlo revision history revision number revision date description pages changed 0 3/11 initial release
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