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general description the MAX16052/max16053 are a family of small, low- power, high-voltage monitoring circuits with sequenc- ing capability. these miniature devices offer very wide flexibility with an adjustable voltage threshold and an external capacitor-adjustable time delay. these devices are ideal for use in power-supply sequencing, reset sequencing, and power switching applications. multiple devices can be cascaded for complex sequencing applications. a high-impedance input (in) with a 0.5v threshold allows an external resistive divider to set the monitored threshold. the output (out) asserts high when the input voltage rises above the 0.5v threshold and the enable input (en) is asserted high. when the voltage at in falls below 0.495v or when the enable input is deasserted (en = low), the output deasserts (out = low). the MAX16052/max16053 provide a capacitor programmable delay time from when the voltage at in rises above 0.5v to when the output is asserted. the MAX16052 offers an active-high open-drain output while the max16053 offers an active-high push-pull out- put. both devices operate from a 2.25v to 16v supply voltage and feature an active-high enable input. the MAX16052/max16053 are available in a tiny 6-pin sot23 package and are fully specified over the auto- motive temperature range (-40? to +125?). applications features 1.8% accurate adjustable threshold over temperature open-drain (28v tolerant) output allows interfacing to 12v intermediate bus voltage operates from v cc of 2.25v to 16v low supply current (18? typ) capacitor-adjustable delay active-high logic-enable input fully specified from -40? to +125? small 6-pin sot23 package MAX16052/max16053 high-voltage, adjustable sequencing/supervisory circuits ________________________________________________________________ maxim integrated products 1 gnd out in 1 6 cdelay 5 v cc en MAX16052 max16053 sot23 top view 2 34 pin configuration dc-dc converter dc-dc converter in en out gnd cdelay v cc in v cc en out gnd cdelay out in en 12v 0.9v MAX16052 MAX16052 typical operating circuit 19-4144; rev 1; 10/08 for pricing, delivery, and ordering information, please contact maxim direct at 1-888-629-4642, or visit maxim? website at www.maxim-ic.com. automotive medical equipment intelligent instruments portable equipment computers/servers critical ? monitoring set-top boxes telecom ordering information note: all devices operate over the -40? to +125? operating automotive temperature range. + denotes a lead-free/rohs-compliant package. t = tape and reel, offered in 2.5k increments. part output pin- package top mark MAX16052 aut+t open-drain 6 sot23 +aclw max16053 aut+t push-pull 6 sot23 +aclx
MAX16052/max16053 high-voltage, adjustable sequencing/supervisory circuits 2 _______________________________________________________________________________________ absolute maximum ratings electrical characteristics (v cc = 2.25v to 16v, v en = v cc , t a = t j = -40? to +125?, unless otherwise specified. typical values are at v cc = 3.3v and t a = +25?.) (note 1) stresses beyond those listed under ?bsolute maximum ratings?may cause permanent damage to the device. these are stress rating s only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specificatio ns is not implied. exposure to absolute maximum rating conditions for extended periods may affect device reliability. (all voltages referenced to gnd.) v cc .........................................................................-0.3v to +30v out (push-pull, max16053) ......................-0.3v to (v cc + 0.3v) out (open-drain, MAX16052)................................-0.3v to +30v en, in .........................................................-0.3v to (v cc + 0.3v) cdelay....................................................................-0.3v to +6v input/output current (all pins)..........................................?0ma continuous power dissipation (t a = +70?) 6-pin sot23 (derate 8.7mw/? above +70?)..........695.7mw operating temperature range .........................-40? to +125? junction temperature ......................................................+150? storage temperature range .............................-65? to +150? lead temperature (soldering, 10s) .................................+300? parameter symbol conditions min typ max units supply operating voltage range v cc 2.25 16 v undervoltage lockout uvlo v cc falling (note 2) 1.8 2 v v cc = 3.3v 18 37 MAX16052, no load v cc = 12v 23 45 v cc = 3.3v 22 47 v cc supply current i cc max16053, no load v cc = 12v 29 57 ? in threshold voltage v th v in rising, 2.25v v cc 16v 0.491 0.500 0.509 v hysteresis v hyst v in falling 5 mv input current i in v in = 0 or 16v -40 +5 +60 na cdelay cdelay charge current i cd v cdelay = 0v 200 250 300 na cdelay threshold v tcd v cdelay rising 0.95 1.00 1.05 v v cc 2.25v, i sink = 200? 15 60 cdelay pulldown resistance r cdelay v cc 3.3v, i sink = 1ma 15 60 en en low voltage v il 0.5 v en high voltage v ih 1.4 v en leakage current i leak v en = 0v or v cc -55 +15 +55 na out v cc 1.2v, i sink = 90? 0.2 v cc 2.25v, i sink = 0.5ma 0.3 out low voltage (open-drain or push-pull) v ol v cc > 4.5v, i sink = 1ma 0.4 v v cc 2.25v, i source = 500? 0.8 x v cc out high voltage (push-pull, max16053) v oh v cc 4.5v, i source = 800? 0.9 x v cc v out leakage current (open-drain, MAX16052) i lkg output not asserted low, v out = 28v 150 na
MAX16052/max16053 high-voltage, adjustable sequencing/supervisory circuits _______________________________________________________________________________________ 3 note 1: all devices are production tested at t a = +25?. limits over temperature are guaranteed by design. note 2: when v cc falls below the uvlo threshold, the outputs deassert (out goes low). when v cc falls below 1.2v, the output state cannot be determined. note 3: during the initial power-up, v cc must exceed 2.25v for at least 0.5ms before out can go high. parameter symbol conditions min typ max units timing MAX16052, 100k pullup resistor, c cdelay = 0 30 max16053, c cdelay = 0 30 ? MAX16052, 100k pullup resistor, c cdelay = 0.047? 190 v cc = 3.3v, v in rising, v in = v th + 25mv max16053, c cdelay = 0.047? 190 ms MAX16052, 100k pullup resistor, c cdelay = 0 30 t delay v cc = 12v, v in rising, v in = v th + 25mv max16053, c cdelay = 0 30 v cc = 3.3v, v in falling, v in = v th - 30mv 18 in to out propagation delay t dl v cc = 12v, v in falling, v in = v th - 30mv 18 ? v cc = 2.25v, v in = 0.525v, c cdelay = 0 0.5 startup delay (note 3) v cc = 12v, v in = 12v, c cdelay = 0 0.5 ms en minimum input pulse width t mpw 1s en glitch rejection 100 ns v cc = 3.3v 250 MAX16052, 100k pullup resistor v cc = 12v 300 v cc = 3.3v 350 en to out delay t off from device enabled to device disabled max16053 v cc = 12v 400 ns v cc = 3.3v 14 MAX16052, 100k pullup resistor, c cdelay = 0 v cc = 12v 14 v cc = 3.3v 14 max16053, c cdelay = 0 v cc = 12v 14 ? MAX16052, 100k pullup resistor, c cdelay = 0.047? 190 en to out delay t prop from device disabled to device enabled max16053, c cdelay = 0.047? 190 ms electrical characteristics (continued) (v cc = 2.25v to 16v, v en = v cc , t a = t j = -40? to +125?, unless otherwise specified. typical values are at v cc = 3.3v and t a = +25?.) (note 1)
MAX16052/max16053 high-voltage, adjustable sequencing/supervisory circuits 4 _______________________________________________________________________________________ v cc v th + 25mv v th - v hyst v th v ih v ih v ih v il t prop t dl t delay t off t prop v ol v oh t < t mpw t > t mpw in en out v ulco t < t prop 5% v ih v il figure 1. MAX16052/max16053 timing diagram (c cdelay = 0)
MAX16052/max16053 high-voltage, adjustable sequencing/supervisory circuits _______________________________________________________________________________________ 5 supply current vs. supply voltage MAX16052/53 toc01 v cc (v) i cc ( a) 14 12 8 10 4 6 2 3 6 9 12 15 18 21 24 27 30 0 016 MAX16052 supply current vs. temperature MAX16052/53 toc02 temperature ( c) i cc ( a) 110 95 65 80 -10 5 20 35 50 -25 3 6 9 12 15 18 21 24 27 30 0 -40 125 MAX16052 v cc = 2.25v v cc = 3.3v v cc = 5v v cc = 12v in threshold voltage vs. temperature MAX16052/53 toc03 in threshold voltage (mv) 498.5 499.0 499.5 500.0 500.5 501.0 501.5 502.0 498.0 temperature ( c) 110 95 65 80 -10 5 20 35 50 -25 -40 125 out delay vs. c cdelay MAX16052/53 toc04 c cdelay (nf) out delay (ms) 900 800 600 700 200 300 400 500 100 500 1000 1500 2000 2500 3000 3500 4000 4500 5000 0 01000 output low voltage vs. sink current MAX16052/53 toc05 i sink (ma) output low voltage (v) 18 16 2 4 6 10 12 8 14 1 2 3 4 5 6 7 8 0 020 v cc = 2.25v v cc = 3.3v v cc = 5v v cc = 12v output high voltage vs. source current MAX16052/53 toc06 i source (ma) output high voltage (v) 12 10 8 6 4 2 2 4 6 8 10 12 0 014 typical operating characteristics (v cc = 3.3v and t a = +25?, unless otherwise noted.)
in leakage current vs. temperature MAX16052/53 toc10 temperature ( c) in leakage current (ma) 110 95 65 80 -10 5 20 35 50 -25 1 2 3 4 5 6 7 8 9 10 0 -40 125 v cc = 16v v cc = v en = v in in leakage current vs. in voltage MAX16052/53 toc11 in voltage (v) in leakage current (na) 14 12 8 10 4 6 2 -8 -6 -4 -2 0 2 4 6 8 10 -10 016 v cc = 16v v cc = v en MAX16052/max16053 high-voltage, adjustable sequencing/supervisory circuits 6 _______________________________________________________________________________________ typical operating characteristics (t a = +25?, unless otherwise noted.) maximum transient duration vs. input overdrive MAX16052/53 toc07 input overdrive (mv) maximum transient duration ( s) 100 10 50 100 150 200 250 300 0 11000 reset occurs above this curve enable turn-on delay (max16053) MAX16052/53 toc08 10 s/div en 2v/div out 2v/div enable turn-off delay (max16053) MAX16052/53 toc09 400ns/div en 2v/div out 2v/div
MAX16052/max16053 high-voltage, adjustable sequencing/supervisory circuits _______________________________________________________________________________________ 7 pin description pin name function 1en active-high logic-enable input. drive en low to immediately deassert the output to its false state (out = low) independent of v in . with v in above v th , drive en high to assert the output to its true state (out = high) after the adjustable delay period. connect en to v cc , if not used. 2 gnd ground 3in high-impedance monitor input. connect in to an external resistive divider to set the desired monitor threshold. the output changes state when v in rises above 0.5v and when v in falls below 0.495v. 4 out active-high sequencer/monitor output. open-drain (MAX16052) or push-pull (max16053). out is asserted to its true state (out = high) when v in is above v th and the enable input is in its true state (en = high) after the capacitor-adjusted delay period. out is deasserted to its false state (out = low) immediately after v in drops below 0.495v or the enable input is in its false state (en = low). the MAX16052 open-drain output requires an external pullup resistor. 5v cc supply voltage input. connect a 2.25v to 16v supply to v cc to power the device. for noisy systems, bypass with a 0.1? ceramic capacitor to gnd. 6 cdelay capacitor-adjustable delay input. connect an external capacitor (c cdelay ) from cdelay to gnd to set the in-to-out and en-to-out delay period. for v in rising, t delay = (c cdelay x 4.0 x 10 6 ) + 30?. for en rising, t prop = (c cdelay x 4.0 x 10 6 ) + 14?. en leakage current vs. temperature MAX16052/53 toc12 temperature ( c) en leakage current (na) 110 95 65 80 -10 5 20 35 50 -25 1 2 3 4 5 6 7 8 9 10 0 -40 125 v cc = 16v v cc = v en = v in en leakage current vs. en voltage MAX16052/53 toc13 en voltage (v) en leakage current (na) 14 12 8 10 4 6 2 -8 -6 -4 -2 0 2 4 6 8 10 -10 016 v cc = 16v v cc = v in typical operating characteristics (continued) (v cc = 3.3v and t a = +25?, unless otherwise noted.)
MAX16052/max16053 high-voltage, adjustable sequencing/supervisory circuits 8 _______________________________________________________________________________________ control logic en in cdelay 250na 1.0v 0.5v v cc internal v cc /uvlo ref out gnd MAX16052 control logic en in cdelay 250na 1.0v 0.5v v cc internal v cc /uvlo ref out gnd max16053 figure 2. simplified functional diagram detailed description the MAX16052/max16053 family of high-voltage, sequencing/supervisory circuits provide adjustable voltage monitoring for inputs down to 0.5v. these devices are ideal for use in power-supply sequencing, reset sequencing, and power-switching applications. multiple devices can be cascaded for complex sequencing applications. the MAX16052/max16053 perform voltage monitoring using a high-impedance input (in) with an internally fixed 0.5v threshold. when the voltage at in falls below 0.5v or when the enable input is deasserted (en = low) out goes low. when v in rises above 0.5v and the enable input is asserted (en = high), out goes high after a capacitor-adjustable time delay. with v in above 0.5v, the enable input can be used to turn on or off the output. table 1 details the output state depending on the various input and enable conditions. supply input (v cc ) the device operates with a v cc supply voltage from 2.25v to 16v. in order to maintain a 1.8% accurate threshold at in, v cc must be above 2.25v. when v cc falls below the uvlo threshold, the output deasserts low. when v cc falls below 1.2v, the output state is not guaranteed. for noisy systems, connect a 0.1? ceramic capacitor from v cc to gnd as close to the device as possible. table 1. MAX16052/max16053 in en out v in < v th low low v in < v th high low v in > v th low low out = high impedance (MAX16052) v in > v th high out = v cc (max16053)
MAX16052/max16053 monitor input (in) connect the center point of a resistive divider to in to monitor external voltages (see r1 and r2 of figure 4). in has a rising threshold of v th = 0.5v and a falling thresh- old of 0.495v (5mv hysteresis). when v in rises above v th and en is high, out goes high after the adjustable t delay period. when v in falls below 0.495v, out goes low after a 18? delay. in has a maximum input current of 60na, so large value resistors are permitted without adding significant error to the resistive divider. adjustable delay (cdelay) when v in rises above v th with en high, the internal 250na current source begins charging an external capacitor connected from cdelay to gnd. when the voltage at cdelay reaches 1v, the output asserts (out goes high). when the output asserts, c cdelay is immediately discharged. adjust the delay (t delay ) from when v in rises above v th (with en high) to out going high according to the equation: where t delay is in seconds and c cdelay is in farads. enable input (en) the MAX16052/max16053 offer an active-high enable input (en). with v in above v th , drive en high to force out high after the capacitor-adjustable delay time. the en-to-out delay time (t prop ) can be calculated from when en goes above the en threshold using the equation: where t prop is in seconds and c cdelay is in farads. drive en low to force out low within 300ns for the MAX16052 and within 400ns for the max16053. output (out) the MAX16052 offers an active-high, open-drain output while the max16053 offers an active-high push-pull out- put. the push-pull output is referenced to v cc . the open-drain output requires a pullup resistor and can be pulled up to 28v. applications information input threshold the MAX16052/max16053 monitor the voltage on in with an external resistive divider (figure 4). r1 and r2 can have very high values to minimize current con- sumption due to low in leakage currents (60na max). set r2 to some conveniently high value (200k for ?% additional variation in threshold, for example) and cal- culate r1 based on the desired monitored voltage using the following formula: where v monitor is the desired monitored voltage and v th is the reset input threshold (0.5v). pullup resistor values (MAX16052 only) the exact value of the pullup resistor for the open-drain output is not critical, but some consideration should be made to ensure the proper logic levels when the device is sinking current. for example, if v cc = 2.25v and the pullup voltage is 28v, keep the sink current less than 0.5ma as shown in the electrical characteristics table. as a result, the pullup resistor should be greater than 56k . for a 12v pullup, the resistor should be larger than 24k . note that the ability to sink current is depen- dent on the v cc supply voltage. ensuring a valid out down to v cc = 0v (push-pull out) in applications in which out must be valid down to v cc = 0v, add a pulldown resistor between out and gnd for the push-pull output (max16053). the resistor sinks any stray leakage currents, holding out low (figure 3). the value of the pulldown resistor is not criti- cal; 100k is large enough not to load out and small enough to pull out to ground. the external pulldown cannot be used with the open-drain out output. rr v v monitor th 12 1 = ? ? ? ? ? ? ? tc s prop cdelay =+ ()() 410 14 6 ? tc s delay cdelay =+ ()() 410 30 6 ? gnd out v cc v cc 100k max16053 figure 3. ensuring out valid to v cc = 0v high-voltage, adjustable sequencing/supervisory circuits _______________________________________________________________________________________ 9
MAX16052/max16053 high-voltage, adjustable sequencing/supervisory circuits 10 ______________________________________________________________________________________ typical application circuits figures 4? show typical applications for the MAX16052/max16053. figure 4 shows the MAX16052 used with a p-channel mosfet in an overvoltage pro- tection circuit. figure 5 shows the max16053 in a low- voltage sequencing application using an n-channel mosfet. figure 6 shows the max16053 used in a mul- tiple output sequencing application. using an n-channel device for sequencing in higher power applications, using an n-channel device reduces the loss across the mosfet as it offers a lower drain-to-source on-resistance. however, an n- channel mosfet requires a sufficient v gs voltage to fully enhance it for a low r ds_on . the application shown in figure 5 shows the max16053 in a switch sequencing application using an n-channel mosfet. similarly, if a higher voltage is present in the system, the open-drain version can be used in the same manner. power-supply bypassing in noisy applications, bypass v cc to ground with a 0.1? capacitor as close to the device as possible. the additional capacitor improves transient immunity. for fast-rising v cc transients, additional capacitors may be required. in gnd out cdelay 0 to 28v r1 r2 p r pullup v cc c cdelay en 3.3v always-on MAX16052 in gnd out cdelay monitored 3.3v r1 r2 n v cc c cdelay en 5v bus 1.2v input 1.2v output max16053 figure 4. overvoltage protection figure 5. low-voltage sequencing using an n-channel mosfet
MAX16052/max16053 high-voltage, adjustable sequencing/supervisory circuits ______________________________________________________________________________________ 11 dc-dc dc-dc dc-dc dc-dc 5v bus 3.3v 2.5v 1.8v 1.2v en en in in out out in out in out v cc system enable en v cc en v cc en v cc en c cdelay gnd gnd gnd c cdelay c cdelay gnd c cdelay en en max16053 max16053 max16053 max16053 figure 6. multiple output sequencing package information for the latest package outline information, go to www.maxim-ic.com/packages . package type package code document no. 6 sot23 u6+1 21-0058 chip information process: bicmos
MAX16052/max16053 high-voltage, adjustable sequencing/supervisory circuits maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a maxim product. no circu it patent licenses are implied. maxim reserves the right to change the circuitry and specifications without notice at any time. 12 ____________________maxim integrated products, 120 san gabriel drive, sunnyvale, ca 94086 408-737-7600 2008 maxim integrated products is a registered trademark of maxim integrated products, inc. revision history revision number revision date description pages changed 0 5/08 initial release 1 10/08 update adjustable delay (cdelay) and power-supply bypassing sections. 8, 10

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