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19-7643; rev 1; 8/15 ordering information and recommended application circuit for hot-swap applications a ppear at end of data sheet. general description the max15090b/max15090c ics are integrated solutions for hot-swap applications requiring the safe insertion and removal of circuit line cards from a live backplane. the devices integrate a hot-swap controller, 6m? power mosfet, and an electronic circuit-breaker protection in a single package. the devices integrate an accurate current-sense circuitry and provide 220a/a of proportional output current. the devices are designed for protection of 2.7v to 18v supply voltages.these devices implement a foldback current limit during startup to control inrush current lowering di/dt and keep the mosfet operating under safe operating area (soa) conditions. after the startup cycle is complete, on-chip comparators provide variablespeed/bilevel? protection against short-circuit and overcurrent faults, and immunity against system noise and load transients. the load is disconnected in the event of a fault condition. the devices are factory calibrated to deliver accurate overcurrent protection with 10% accuracy. during a fault condition, the max15090b latches off, while the max15090c enters autoretry mode. the devices feature an in-to-out short-circuit detection before startup. the devices provide a power-mosfet gate pin to program the slew rate during startup by adding an external capacitor. the devices have overvolt - age/undervoltage input pins that can detect an overvolt - age/undervoltage fault and disconnect the in from the out. additional features include internal overtemperature protection, power-good output, and fault-indicator output. the max15090b/max15090c ics are available in a 28-bump, 2.07mm x 3.53mm, power wafer-level package (wlp) and are rated over the -40c to +85c extended temperature range. beneits and features integration reduces solution size for blade servers and other space-constrained designs ? integrated 6m? (typ) internal power mosfet overvoltage protection ? power-good and fault outputs ? programmable undervoltage lockout ? current reporting without need for external r sense ? thermal protection flexibility enables use in many unique designs ? 2.7v to 18v operating voltage range ? adjustable circuit-breaker current/current-limit threshold ? programmable slew-rate control ? variable-speed circuit-breaker response ? latchoff or automatic retry options safety features ensure accurate, robust protection ? 12a (max) load current capability ? 10% circuit-breaker threshold accuracy ? inrush current regulated at startup with foldback ? implementation for di/dt control ? in-to-out short-circuit detection variablespeed/bilevel is a trademark of maxim integrated products, inc. applications raid systems storage bridge bay disk drive power server i/o cards industrial typical application circuit max15090bmax15090c 10? 40.2k? 100k? 12v 1f tvs in v cc uv 12v ov en gnd cb reg 100k? 178k? 5.23k? 17.8k? 1f gate outpg faultisense dc-dc regulator 3.3v output a d converter 500f cdl 1k? 10f max15090b/max15090c 2.7v to 18v, 12a, hot-swap solution with current report output evaluation kit available downloaded from: http:///
junction-to-ambient thermal resistance ( q ja ) .............. 42c/w v cc to gnd .......................................................... -0.3v to +20v in to gnd .............................................................. -0.3v to +20v out to gnd ............................................... -0.3v to (v in + 0.3v) gate to out .......................................................... -0.3v to +6v cdly, isense to gnd .......................... -0.3v to (v reg + 0.3v) en , cb, uv, ov to gnd ......................................... -0.3v to +6v reg to gnd ............................ -0.3v to min (+6v, (v cc + 0.3v)) pg, fault to gnd ............................................... -0.3v to +20v continuous power dissipation (t a = +70c) wlp (derate 23.8mw/ n c above +70c) .................... 1500mw operating temperature range ........................... -40 n c to +85c junction temperature ...................................................... +150c storage temperature range ............................ -60 n c to +150c lead temperature (soldering, 10s) ................................. +300c soldering temperature (reflow) ....................................... +260c (v in = v cc = 2.7v to 18v, t a = t j = -40c to +85c, unless otherwise noted. typical values are at v in = 12v, r cb = 33.2k?, and t a = +25c.) (note 2) parameter symbol conditions min typ max units power suppliesv cc operating range v cc 2.7 18 v in operating range v in 2.7 18 v v cc supply current i cc v in = 3v 0.5 0.75 ma in supply current i in r cb = 40.2k, no load 5.1 6.2 ma r cb = 10k, no load 1.4 1.8 v cc default undervoltage lockout v uvlo v cc rising 2.35 2.5 2.65 v v cc default undervoltage- lockout hysteresis v uvlo_hys 0.1 v reg regulator voltage v reg no load, v cc > 4v 3.15 3.35 3.55 v uv turn-on threshold v uv_th v uv rising 1.21 1.23 1.25 v uv turn-on threshold hysteresis v uv_hys v uv falling 0.1 v ov turn-on threshold v ov_th v ov rising 1.21 1.23 1.25 v ov turn-on threshold hysteresis v ov_hys v ov falling 0.1 v en threshold v en _th v en rising 0.95 1 1.05 v en threshold hysteresis v en _hys v en falling 0.1 v junction-to-case thermal resistance ( q jc ) ..................... 7c/w absolute maximum ratingspackage thermal characteristics (note 1) electrical characteristics 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 absolute maximum rating conditions for extended periods may affect device reliability. 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-tutori- al . thermal resistance can be lowered with improved board design. www.maximintegrated.com maxim integrated 2 max15090b/max15090c 2.7v to 18v, 12a, hot-swap solution with current report output downloaded from: http:///
(v in = v cc = 2.7v to 18v, t a = t j = -40c to +85c, unless otherwise noted. typical values are at v in = 12v, r cb = 33.2k?, and t a = +25c.) (note 2) parameter symbol conditions min typ max units ov, uv, en input leakage current i leak v ov = v uv = v en = 0 to 5v -1 +1 a cb source current i thcb_norm power-on mode 12 a current limit circuit-breaker accuracy (note 3) i cb,th v in = 12v r cb = 40.2k 10.85 12.06 13.27 a r cb = 10k 2.7 3 3.3 circuit-breaker accuracy deviation r cb = 10k to 40.2k, compared to nominal current-limit value -10 +10 % slow-comparator response time (note 4) t scd 0.6% overcurrent 1.5 ms 30% overcurrent 200 s maximum current limit during startup i lim_max (see figure 2) 0.5 x i cb,th a fast-comparator threshold i fc_th 1.5 x i cb,th a minimum cb voltage reference during foldback (note 5) v thcb_min v in - v out > 10v, r cb = 40.2k 60 mv maximum cb voltage reference during foldback (note 5) v thcb_max v in - v out < 2v, r cb = 40.2k 240 mv timing startup maximum time duration t su 43 48 53 ms autorestart delay time t restart 3.2 s time delay comparator high threshold v dly_th 1.85 2 2.15 v time delay pullup current i dly 1.6 1.9 2.2 a output short detection at startup t short 10.8 12 13.2 ms mosfet total on-resistance r on t a = +25c 5.5 7.5 m t a = -40c to +85c 9 gate charge current i gate 4.5 5.7 7 a electrical characteristics (continued) www.maximintegrated.com maxim integrated 3 max15090b/max15090c 2.7v to 18v, 12a, hot-swap solution with current report output downloaded from: http:///
(v in = v cc = 2.7v to 18v, t a = t j = -40c to +85c, unless otherwise noted. typical values are at v in = 12v, r cb = 33.2k?, and t a = +25c.) (note 2) note 2: all devices are 100% production tested at t a = +25c. limits over temperature are guaranteed by design. note 3: 40.2k? is the maximum allowed external resistance value to be connected at cb pin to gnd for safe o peration. all devices are tested with10k?, the parameter specified at r cb = 40.2k? is guaranteed by bench characterization and correlation, with respect to the tested parameter at r cb = 10k?. the formula that describes the relationship between r cb and the circuit- breaker current threshold is: i cb = r cb /3333.3. note 4: the current-limit slow-comparator response time is weighed against the amount of overcurrent so the higher the overcurrent condition, the faster the response time. note 5: foldback is active during the startup phase so the internal power mosfet operates within soa. parameter symbol conditions min typ max units outputs fault , pg output low voltage v ol low-impedance state,i fault = +5ma, i pg = +5ma 0.4 v fault , pg output high leakage current i oh high-impedance state,v fault = 16v, v pg = 16v 1 a current reportisense full-scale current i isense 2.64 ma isense gain ratio i sense /i out 220 a/a isense voltage range v isense v in = 12v 0 2.5 v isense offset error i isense_off t a = +25c -30 +30 a t a = -40c to +85c -50 +50 isense differential gain error i isense_error t a = +25c, i out = 1a, i out = 100ma -2.5 +2.5 % t a = -40c to +85c, i out = 1a, i out = 100ma -4 +4 pg threshold pg threshold v pg measured at v out 0.9 x v in v pg assertion delay t pg from v out > v pg and (v gate - v in ) > 3v 12 16 20 ms out to in short-circuit detection threshold v iosht measured at v out 0.9 x v in out precharge threshold v pc measured at v out 0.5 x v in v thermal shutdownthermal shutdown t sd t j rising +150 c thermal-shutdown hysteresis t j falling 20 c electrical characteristics (continued) www.maximintegrated.com maxim integrated 4 max15090b/max15090c 2.7v to 18v, 12a, hot-swap solution with current report output downloaded from: http:///
(v in = v cc = 2.7v to 18v, t j = -40c to +85c, unless otherwise noted. typical values are at v in = 12v, r cb = 33.2k?, and t j = +25c.) (note 3) in supply current vs. temperature toc01 temperature (c) in supply current (ma) 60 35 10 -15 5.05 5.10 5.15 5.205.00 -40 85 v in = 12v on-resistance vs. temperature toc04 temperature (c) on-resistance (m ? ) 60 35 10 -15 5 6 74 -40 85 v in 1v i oa 1a circuit-breaker threshold vs. circuit-breaker resistance toc0 2 r cb (k ? ) circuit-breaker threshold (a) 35 30 25 20 15 2 4 6 8 1210 0 10 40 i 12 circuit-breaker threshold vs. temperature toc03 temperature (c) circuit-breaker threshold (a) 60 35 10 -15 2 4 6 10 12 14 0 -40 5 i 12 r cb 40 ? r cb 30 ? r cb 20 ? r cb 10 ? normal turn-off waveform toc06 i load = 6a 10ms /div v uv 2v/divv out 10v/divv pg 10v/divi load 10a/div 0v0v 0v 0a turn-on waveform toc05 i load = 6a 10m s/ div v uv 2v/divv out 10v/divv pg 10v/divi load 10a/div 0v0v 0v 0a c gate = 5.6nf r cb = 40.2k typical operating characteristics maxim integrated 5 www.maximintegrated.com max15090b/max15090c 2.7v to 18v, 12a, hot-swap solution with current report output downloaded from: http:///
(v in = v cc = 2.7v to 18v, t j = -40c to +85c, unless otherwise noted. typical values are at v in = 12v, r cb = 33.2k?, and t j = +25c.) (note 3) fault-shutdown waveform overload (slow trip) toc07 1ms /d iv v out 10v/divv pg 10v/divv fault 10v/div i load 10a/div 0v0a 0v 0v pg assertion delay toc10 10ms /div v uv 1v/divv out 5v/divv pg 5v/div 0v0v 0v v out 10v/div i in , i out 10a/div v pg 10v/div v fault 10v/div 10 s /div typical application circuit fault - shutdown waveform overload (short circuit) i in i out toc08 autoretry functionality toc11 1s/div v out 10v/divv pg 10v/divv fault 10v/div i load 10a/div 0v0a 0v 0v uv risin g/ falling threshold voltage vs. temperature toc09 temperature (c) uv rising/falling threshold (a) 60 35 10 -15 1.20 1.25 1.30 1.351.15 -40 85 v in = 12v v uv rising v uv falling 0.01 0.1 1 10 0 20 40 60 80 100 circuit - breaker reaction time (ms) overcurrent level above i cb,th (%) circuit - breaker reaction time vs. overcurrent level v in = 12v v in = 3.3v typical application circuit toc12 typical operating characteristics (continued) maxim integrated 6 www.maximintegrated.com max15090b/max15090c 2.7v to 18v, 12a, hot-swap solution with current report output downloaded from: http:///
bump name function a1 isense current-sense output. the isense output sources a current that is proportional to the output current . connect a resistor between isense and gnd to produce a scaled voltage. a2 v cc power-supply input. connect v cc to a voltage between 2.7v and 18v. connect a schottky diode (or 6 resistor) from in to v cc and a 1 f f bypass capacitor to gnd to guarantee full operation in the event v in collapses during a strong short from out to gnd. a3, a5, b3, b5, c3, c5, d5 in supply voltage input. in is connected to the drain of the internal 6m mosfet. bypass in with a transient voltage-suppressor diode to gnd for clamping inductive kick transients in the case of fast output short-circuit to gnd. a4, b4, b6, c4, c6, d4, d6 out load output. source of the internal power mosfet. top view (bump side down) 1 23456 7 b a cd wl p (2.07mm x 3.53mm) max15090bmax15090c v cc gn d gn d uv ou t ou t ou t ou t isense cb gnd re g in inin in gate ou t ou t ou t cdl y pg inin in ov fault en + bump description bump coniguration www.maximintegrated.com maxim integrated 7 max15090b/max15090c 2.7v to 18v, 12a, hot-swap solution with current report output downloaded from: http:///
bump name function a6 gate gate of internal mosfet. during startup, a 5.7a current is sourced to enhance the internal mosfet with a 10v/ms slew rate. connect an external capacitance from gate to gnd to reduce the output slew rate during startup. a7 cdly enable timer input. connect a capacitor between cdly and gnd to set a 1s/f duration timeout delay. the en input has to be pulled low before the timeout delay elapses, to prevent internal mosfet shutdown after power-up. minimum required capacitor for cdly is 1000pf; short to gnd if not needed. b1 cb current-limit threshold set. connect a resistor from cb to gnd to set the circuit-breaker threshold. maximum value of 40.2k can be accepted for safe operation. having the cb pin connected to gnd sets the circ uit-breaker threshold at 0a. b2, c1, c2 gnd ground b7 en enable input. this input does not function like a traditional enable input (see uv description). ext ernally pulled up to logic-high state through a resistor normally connected to reg. the en input must be pulled down (for at least 1ms) by the external circuit before a programmable timeout delay has elapsed, otherwise a shutdown occurs. the timeout timer starts counting when the internal mosfet is turned on . connect a capacitor between cdly and gnd to program the duration of the timeout delay. connect en to gnd to disable this feature. c7 fault fault status output. fault is an open-drain, active-low output. see the fault-status output ( fault ) section for conditions that make fault assert low. fault is disabled during startup. d1 reg internal regulator output. bypass to ground with a 1f capacitor. do not power external circuitry us ing the reg output (except a resistor > 50k connected from reg to en ). optional: for v cc values lower than v reg_max , reg can be connected to v cc to maximize the voltage on the reg pin (see the electrical characteristics table). d2 uv active-high enable comparator input. pulling uv high enables the internal mosfet to turn on. uv also sets the undervoltage threshold. see the setting the undervoltage threshold section. d3 ov overvoltage enable input. pull ov high to turn off the internal mosfet. connect ov to an external resistive divider to set the overvoltage-disable threshold. see the setting the overvoltage threshold section. d7 pg power-good output. pg is an open-drain, active-high output. pg pulls low until the internal power mosfet is fully enhanced. bump description (continued) www.maximintegrated.com maxim integrated 8 max15090b/max15090c 2.7v to 18v, 12a, hot-swap solution with current report output downloaded from: http:///
max15090bmax15090c uv ov cdly 1.23v 2v 1.9a temp sense startup control and foldback control logic 2 x i slew i pd i gate i ref m s1 v cc gate in outi sense faultpg 12a cb gate_ok reference generator reg en ldo regulator dly ctrl i load /4 545 cb_slow_compfast_comp m pow charge pump 0.9 x v in v cc 1.23v gate i load gnd functional diagram www.maximintegrated.com maxim integrated 9 max15090b/max15090c 2.7v to 18v, 12a, hot-swap solution with current report output downloaded from: http:///
detailed description enable logic and undervoltage/overvoltage-lockout threshold the max15090b/max15090c ics enable the output, as shown in table 1 . the devices are ready to drive the out - put when the v cc supply rises above the v uvlo thresh - old. the devices turn on the output when v cc > v uvlo , v uv is high (v uv > 1.23v) and v ov is low (v ov < 1.23v). the devices turn off the output when v uv falls below (1.23v - v uv_hys ) or v ov rises above 1.23v. an external resistive divider from in to uv, ov, and ground provide the flexibility to set the undervoltage/overvoltage-lockout threshold to any desired level between v uvlo and 18v. see figure 1 and the setting the undervoltage threshold and setting the overvoltage threshold sections. startup once the device output is enabled, the device provides controlled application of power to the load. the voltage at out begins to rise at approximately 10v/ms default until the programmed circuit-breaker current level is reached, while the devices actively limit the inrush current at the circuit-breaker setting. an external capacitor connected to the gate pin allows the user to program the slew rate to a value lower than the default. the inrush current can be pro grammed by selecting the appropriate value of r cb . during startup, a foldback current limit is active to protect the internal mosfet to operate within the soa ( figure 2 ). an internal 48ms timer (t su ) starts counting when the devices enter the startup phase. the devices complete the startup phase and enter normal operation mode if the voltage at out rises above the precharge threshold (0.9 x v in ) and (v gate - v out ) > 3v. an open-drain power-good output (pg) goes high-impedance 16ms after the startup successfully completes. device enters fault mode if start - up does not complete before t su expires. startup time is nominally v out ramp time plus 6ms, including the time it takes for gate to get to v out +3v. the thermal-protection circuit is always active and the internal mosfet immediately turned off when the thermal-shutdown threshold condition is reached. x = dont care. v uv_th and v ov_th = 1.23v (typ). table 1. output enable truth table figure 1. undervoltage/overvoltage-threshold setting figure 2. startup inrush current foldback characteristics power supply precision analog inputs out v cc uv ov v cc > v uvlo v uv > v uv_th v ov < v ov_th on v cc < v uvlo x x off x v uv < (v uv_th - v uv_hys ) x off x x v ov > v ov_th off max15090bmax15090c in uv ov gnd 1.23v r1r2 r3 control logic i i nrus h 2v 10v 6a 1.5a 1a 0.25a v in - v ou t r cb = 40.2 k r cb = 10 k www.maximintegrated.com maxim integrated 10 max15090b/max15090c 2.7v to 18v, 12a, hot-swap solution with current report output downloaded from: http:///
variablespeed/bilevel fault protection variablespeed/bilevel fault protection incorporates com - parators with different thresholds and response times to monitor the load current (see the typical operating characteristics section). protection is provided in normal operation (after the startup period has expired) by dis - charging the mosfet gate in response to a fault condition. during a fault condition, the max15090c enters autoretry mode, while the max15090b latches off (see the autoretry and latchoff fault management section). enable input ( en ) after a startup phase is successfully completed and the power-good output asserted, the en input has to be pulled low (for at least 1ms) before the t dly delay elapses. if the en input is not pulled low before the t dly elapses, then the devices turn off the internal mosfet immediately and a new cycle is required for entering power-up mode. connect a capacitor between cdly and gnd to set a 1s/f duration timeout delay. if this function in is not implemented, connect en to gnd for proper operation. charge pump an integrated charge pump provides the gate-drive volt - age for the internal power mosfet. the charge pump generates the proper gate drive voltage above v in to fully enhance the internal power mosfet and guarantee low r on operation during normal state conditions. during startup, the internal charge pump drives the gate of the mosfet with a fixed 5.7a current to enhance the internal mosfet with 10v/ms slew rate (typ). connect an external capacitor (c gate ) from gate to gnd to reduce the output slew rate during startup. c gate can be calculated according to the following formula: c gate = i gate x (t on /v out ) where i gate is 5.7a (typ), t on is the desired output ramp-up time, and v out is assumed to start from zero. the slew rate of the out pin during startup can be controlled by i gate /c gate under light-load driving conditions, or by the limited inrush current and the external capacitive load, whichever is less. (v out /t) = i lim /c load i lim varies during startup as v out ramps up. see the electrical characteristics table and figure 2 . circuit-breaker comparator and current limit the current that passes through the internal power mosfet is com pared to a circuit-breaker threshold. an external resistor between cb and gnd sets this threshold according to the following formula: i cb = r cb /3333.3 where i cb is load current in amps and r cb (the resistor between cb and gnd) is in ohms. the circuit-breaker comparator is designed so the load current can exceed the threshold for some amount of time before tripping. the time delay varies inversely with the overdrive above the threshold. the greater the over - current condition, the faster the response time, allow ing the devices to tolerate load transients and noise near the circuit-breaker threshold. the maximum allowed external resistor value is 40.2k?, which corresponds to a 12a cb threshold setting. programming the cb threshold to a value higher than 12a could cause unsafe operating conditions, resulting in damage to the devices. the devices also feature catastrophic short-circuit protec tion. during normal operation, if out is shorted directly to gnd, a fast protection circuit forces the gate of the internal mosfet to discharge quickly and disconnect the output from the input. autoretry and latchoff fault management during a fault condition, the devices turn off the inter nal mosfet, disconnecting the output from the input. the max15090c enters autoretry mode and restarts after a t restart time delay has elapsed. the max15090b latches off and remains off until the uv input is cycled off and on after a t restart delay. the delay prevents the latchoff device to restart and operate with an unsafe power-dissipation duty cycle. fault-status output ( fault ) fault is an open-drain output that asserts low when the following conditions occur: current limit, overtemperature, in-to-out short at startup (see the in-to-out short-circuit protection section), and if device does not complete startup before the t su timer expires (see the startup section). fault remains low until the next startup cycle. fault is capable of sinking up to 5ma current when asserted. www.maximintegrated.com maxim integrated 11 max15090b/max15090c 2.7v to 18v, 12a, hot-swap solution with current report output downloaded from: http:///
power-good (pg) delay the devices feature an open-drain, power-good output that asserts after a t pg delay, indicating that the out voltage has reached (0.9 x v in ) voltage and (v gate - v out ) > 3v. internal regulator output (reg) the devices include a linear regulator that outputs 3.3v at reg. reg provides power to the internal circuit blocks of the devices and must not be loaded externally (except for a resistor > 50k? connected from reg to en ). reg requires at least a 1f capacitor to ground for proper operation. current report output (isense) the isense pin is the output of an accurate current- sense amplifier and provides a source current that is pro - portional to the load current flowing into the main switch. the factory-trimmed current ratio is set to 220a/a. this produces a scaled voltage by connecting a resistor between i sense and ground. this voltage signal then goes to an adc and provides digitized information of the current supplied to the powered system. thermal protection the devices enter a thermal-shutdown mode in the event of overheating caused by excessive power dissipation or high ambient temperature. when the junction tem- perature exceeds t j = +150c (typ), the internal thermal- protection circuitry turns off the internal power mosfet. the devices recover from thermal-shutdown mode once the junction temperature drops by 20c (typ). in-to-out short-circuit protection at startup, after all the input conditions are satisfied (uv, ov, v uvlo ), the devices immediately check for an in-to- out short-circuit fault. if v out is greater than 90% of v in , the internal mosfet cannot be turned on so fault is asserted and the max15090c enters autoretry mode in 3.2s, while the max15090b latches off. if v out is lower than 90% of v in but greater than 50% of v in , the internal mosfet still cannot be turned on. no fault is asserted and the mosfet can turn on as soon as v out is lower than 50% of v in . applications information setting the undervoltage threshold the devices feature an independent on/off control (uv) for the internal mosfet. the devices operate with a 2.7v to 18v input voltage range and have a default 2.5v (typ) undervoltage-lockout threshold. the internal mosfet remains off as long as v cc < 2.5v or v uv < v uv_th . the undervoltage-lockout threshold is pro grammable using a resistive divider from in to uv, ov, and gnd ( figure 1 ). when v cc is greater than 2.7v and v uv exceeds the 1.23v (typ) threshold, the internal mosfet turns on and goes into normal operation. use the following equation to calculate the resistor values for the desired undervoltage threshold: ( ) in uv_th v r1 1 r2 r3 v ? ?? = + ???? ?? where v in is the desired turn-on voltage for the output and v uv_th is 1.23v. r1 and (r2 + r3) create a resistive divider from in to uv. during normal operating conditions, v uv must remain above its 1.23v (typ) threshold. if v uv falls 100mv (v uv_hys ) below the threshold, the internal mosfet turns off, disconnecting the load from the input. setting the overvoltage threshold the devices also feature an independent overvoltage- enable control (ov) for the internal mosfet. when v ov exceeds the 1.23v (typ) threshold, the internal mosfet turns off. the overvoltage-lockout threshold is pro grammable using a resistive divider from in to uv, ov, and gnd ( figure 1 ). use the following equation to calculate the resistor values for the desired overvoltage threshold: ( ) in ov_th v r1 r2 1 r3 v ? ?? += ???? ?? where v in is the desired turn-off voltage for the output and v ov_th is 1.23v. r1 and (r2 + r3) create a resistive divider from in to ov. during normal operating conditions, v ov must remain below its 1.23v (typ) threshold. if v ov rises above the v ov_th threshold, the internal mosfet turns off and disconnects the load from the input. wafer-level packaging (wlp) applications information for the latest application details on wlp construction, dimensions, tape carrier information, pcb techniques, bump-pad layout, recommended reflow temperature profile, as well as the latest information on reliability test - ing results, refer to application note 1891: wafer-level packaging (wlp) and its applications . www.maximintegrated.com maxim integrated 12 max15090b/max15090c 2.7v to 18v, 12a, hot-swap solution with current report output downloaded from: http:///
+ denotes a lead(pb)-free/rohs-compliant package. t = tape and reel. part temp range pin- package fault management max15090b ewi+t -40c to +85c 28 wlp latched off max15090c ewi+t -40c to +85c 28 wlp autoretry package type package code outline no. land pattern no. 28 wlp w282b3z+1 21-0577 refer to application note 1891 r in r1 r cb r pg c in tvs in v cc uv 12v ov en gnd cb reg r fault r2 r3 c reg gate outpg faultisense dc-dc regulator 3.3v output a/ d converter c gate cdly c cdly r isense 12v max15090bmax15090c connect these two nodes together on the motherboard. c out 12v ordering information chip information process: bicmos package information for the latest package outline information and land patterns (foot - prints), 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. recommended application circuit for hot-swap applications www.maximintegrated.com maxim integrated 13 max15090b/max15090c 2.7v to 18v, 12a, hot-swap solution with current report output downloaded from: http:///
for pricing, delivery, and ordering information, please contact maxim direct at 1-888-629-4642, or visit maxim integrateds website at www.maximintegrated.com. revision number revision date description pages changed 0 6/15 initial release ? 1 8/15 updated typical application circuit and recommended application circuit for hot-swap applications , electrical characteristics table, replaced tocs 8 and 12 in the typical operating characteristics section, updated bumps a7 and d1 in the bump description table, startup and variable speed/bilevel fault protection sections, and deleted figure 3 1?3, 6, 8, 10, 11, 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 speciications without n otice 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. ? 2015 maxim integrated products, inc. 14 max15090b/max15090c 2.7v to 18v, 12a, hot-swap solution with current report output downloaded from: http:///

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