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general description the max8586 single current-limited switch controls up to 1.2a to power usb applications and has multiple protec- tion features including thermal shutdown, internal current limiting, and reverse current protection. the thermal shut- down limits junction temperature during a prolonged short or overload condition. the internal current-limiting circuitry protects the input supply against overload and is programmable using an external resistor. the max8586 meets all iec specifications for usb ports. the ic latches off when the output experiences a short circuit for more than 20ms, saving system power. auto- restart tests the shorted output with a 25ma current to determine if the short still exists. once the short is removed, the max8586 automatically restarts the out- put. an open-drain fault signal notifies the system that the internal current limit has been reached. a 20ms fault-blanking feature allows the circuit to ignore momentary faults such as those caused when hot- swapping into a capacitive load. an enreset input is available to disable the auto-restart function. the max8586 features a sel input that programs on to be either active high or active low. the ic is supplied in a space-saving, 8-pin, 3mm x 3mm tdfn package. applications usb ports/hubs desktop/notebook computers pdas and palmtop computers docking stations features ? reverse current protection ? programmable current limit up to 1.2a ? accurate current limit ? selectable auto-restart when fault is removed ? thermal-overload protection ? selectable active-high/low on input ? built-in 20ms fault blanking ? compliant with all usb specifications ? 2.75v to 5.5v input supply range ? fault indicator output ? 15kv esd protection (with caps) ? ul listing pending ? tiny 8-pin 3mm x 3mm tdfn package max8586 single 1.2a usb switch in 3mm x 3mm tdfn ________________________________________________________________ maxim integrated products 1 pin configuration appears at end of data sheet. ordering information 19-3449; rev 1; 1/09 evaluation kit available part temp range pin- package top mark max8586eta -40 c to +85 c 8 tdfn 3mm x 3mm (t833-2) amh max8586eta/v+ -40 c to +85 c 8 tdfn 3mm x 3mm (t833-2) amh input supply 2.75v to 5.5v output fault indicator on/off polarity selection on/off control output supply up to 1.2a in out enreset iset fault max8586 sel on gnd auto-restart on/off typical operating circuit /v denotes an automotive qualified part. for pricing, delivery, and ordering information, please contact maxim direct at 1-888-629-4642, or visit maxim's website at www.maxim-ic.com. + denotes a lead(pb)-free/rohs-compliant package.
max8586 single 1.2a usb switch in 3mm x 3mm tdfn 2 _______________________________________________________________________________________ absolute maximum ratings electrical characteristics (v in = v on = v sel = v enreset = 5v, r iset = 26k to gnd, r fault = 100k pullup to v in , c out = 0.1?, t a = -40? to +85?. typical values are at t a = +25?, unless otherwise specified.) (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. in, on, sel, out, fault , iset, enreset to gnd ..-0.3v to +6v in to out.....................................................................-6v to +6v fault sink current ............................................................20ma continuous power dissipation 8-pin 3mm x 3mm tdfn (derate 24mw/? above +70?) ................................1951mw operating temperature range ...........................-40? to +85? junction temperature ......................................................+150? storage temperature range .............................-65? to +150? lead temperature (soldering, 10s) .................................+300? parameter conditions min typ max units supply voltage range 2.75 5.50 v v in = 5v 55 v in = 3v 65 switch on-resistance v in = 4.4v 95 m in standby supply current v on = 0v 3 6 a in quiescent supply current i out = 0a 30 55 ? t a = +25 c 0.02 1 out off-leakage current v on = 0v, v out = 0v t a = +85 c 0.6 ? undervoltage-lockout threshold rising edge, 3% hysteresis (typ) 2.3 2.5 2.7 v r iset = 26k 1.2 1.4 1.6 r iset = 39k 0.800 0.925 1.050 current-limit threshold r iset = 60k 0.5 0.6 0.7 a r iset = 26k 1.35 1.75 2.20 r iset = 39k 1.2 peak short-circuit current limit v out = 0v, (i out pulsing) r iset = 60k 0.74 a (peak) r iset = 26k 0.55 r iset = 39k 0.37 rms short-circuit current limit v out = 0v, (i out pulsing) r iset = 60k 0.23 a (rms) short-circuit/continuous current limit transition threshold (note 2) 1 v fault-blanking timeout period from current-limit condition to fault falling 8 20 40 ms
max8586 single 1.2a usb switch in 3mm x 3mm tdfn _______________________________________________________________________________________ 3 electrical characteristics (continued) (v in = v on = v sel = v enreset = 5v, r iset = 26k to gnd, r fault = 100k pullup to v in , c out = 0.1?, t a = -40? to +85?. typical values are at t a = +25?, unless otherwise specified.) (note 1) note 1: all devices are 100% production tested at t a = +25?. limits over the operating temperature range are guaranteed by design. note 2: the output voltage at which the device transitions from short-circuit current limit to continuous current limit. parameter conditions min typ max units turn-on delay r out = 10 , c out = 1?, measured from on rising to 10% of v out , does not include rise time 0.5 1.5 4.0 ms output rise time r out = 10 , c out = 1?, measured from 10% to 90% of v out 5.5 ms turn-off delay from on r out = 10 , c out = 1? measured from on falling to 90% of v out 100 1000 ? output fall time r out = 10 , c out = 1?, measured from 90% to 10% of v out 4ms thermal-shutdown threshold 15 c hysteresis (typ) +160 c v in = 2.75v to 4.0v 1.6 on, sel, enreset logic input high voltage v in = 4.0v to 5.5v 2.0 v v in = 2.75v to 4.0v 0.6 on, sel, enreset logic input low voltage v in = 4.0v to 5.5v 0.8 v logic input current t a = +25 c-1+1a fault output low voltage i sink = 1ma 0.4 v fault output high leakage current v in = 5.5v, t a = +25 c1a iset current-limit trip point r iset = 26k 600 mv iset external resistance range 26 60 k auto-restart current in latched-off state, v out = 0v 10 25 60 ma auto-restart threshold in latched-off state, v out rising 0.4 0.5 0.6 v auto-restart delay in latched-off state, v out >1v 8 20 40 ms
max8586 single 1.2a usb switch in 3mm x 3mm tdfn 4 _______________________________________________________________________________________ quiescent supply current vs. supply voltage max8586 toc01 supply voltage (v) supply current ( a) 5 4 1 2 3 5 10 15 20 25 30 35 40 0 06 shutdown supply current vs. supply voltage max8586 toc02 supply voltage (v) supply currrent ( a) 5 4 3 2 1 1 2 3 4 5 6 7 8 9 10 0 06 v on = 0v switch leakage current vs. temperature max8586 toc03 temperature ( c) leakage current ( a) 60 35 10 -15 0.05 0.10 0.15 0.20 0.25 0.30 0.35 0.40 0.45 0.50 0 -40 85 v on = 0v normalized on-resistance vs. temperature max8586 toc04 temperature ( c) normalized r on 60 35 10 -15 0.75 1.00 1.25 1.50 0.50 -40 85 continuous current limit vs. temperature max8586 toc05 temperature ( c) current limit (a) 60 35 10 -15 1.42 1.44 1.46 1.48 1.50 1.52 1.54 1.56 1.58 1.60 1.40 -40 85 v enreset = 0v current limit vs. temperature max8586 toc06 temperature ( c) current limit (a) 60 35 10 -15 1.32 1.34 1.36 1.38 1.40 1.42 1.44 1.46 1.48 1.50 1.30 -40 85 v enreset = 5v current limit vs. input voltage input voltage (v) 4.8 4.1 3.4 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 1.9 2.0 1.0 2.7 5.5 max8586 toc07 current limit (a) v enreset = 5v switch on-time vs. temperature max8586 toc08 temperature ( c) on-time (ms) 60 35 10 -15 4.5 5.0 5.5 6.0 6.5 7.0 7.5 8.0 8.5 9.0 4.0 -40 85 r load = 5 no load measured from on high until v out reaches 90% of the input switch off-time vs. temperature max8586 toc09 temperature ( c) output fall time (ms) 60 35 10 -15 1 2 3 4 5 6 7 8 9 10 0 -40 85 r load = 5 measured from on low until v out falls to 10% of the input typical operating characteristics (typical application circuit, v in = v on = v sel = v enreset = 5v, t a = +25?, unless otherwise noted.)
max8586 typical operating characteristics (continued) (typical application circuit, v in = v on = v sel = v enreset = 5v, t a = +25?, unless otherwise noted.) single 1.2a usb switch in 3mm x 3mm tdfn _______________________________________________________________________________________ 5 fault-blanking time vs. temperature max8586 toc10 temperature ( c) fault-blamking time (ms) 60 35 10 -15 17 19 21 23 25 27 29 31 33 35 15 -40 85 auto-restart current vs. temperature auto-restart current (ma) 21 22 23 24 26 25 27 28 20 max8586 toc11 temperature ( c) 60 35 10 -15 -40 85 auto-restart current vs. input voltage max8586 toc12 input voltage (v) auto-restart current (ma) 4.8 4.1 3.4 15 20 25 30 35 40 10 2.7 5.5 r load = 0.5 overload response into 2 max8586 toc13 10ms/div v out i out i in 5v/div 5v/div 2a/div 2a/div fault fault removed overload response into short circuit max8586 toc14 10ms/div v out i out i in 5v/div 5v/div 2a/div 2a/div fault fault removed switch turn-on waveform into no load max8586 toc15 1ms/div v out v on 2v/div 2v/div switch turn-on waveform into 5 load max8586 toc16 1ms/div v out v on 2v/div 2v/div
max8586 single 1.2a usb switch in 3mm x 3mm tdfn 6 _______________________________________________________________________________________ typical operating characteristics (continued) (typical application circuit, v in = v on = v sel = v enreset = 5v, t a = +25?, unless otherwise noted.) switch turn-off waveform into 5 load max8586 toc17 1ms/div v out v on 2v/div 2v/div startup into 10 f max8586 toc18 2ms/div v out i out v in ac-coupled 5v/div 50mv/div 20ma/div 2a/div fault startup into 470 f max8586 toc19 2ms/div v out i out v in ac-coupled 5v/div 50mv/div 500ma/div 2v/div fault uvlo response with 50 load max8586 toc20 4ms/div v out v in 5v/div 2v/div 2v/div fault
max8586 single 1.2a usb switch in 3mm x 3mm tdfn _______________________________________________________________________________________ 7 pin description pin name function 1 sel on polarity selector input. drive sel high to select on for an active-high enable. drive sel to gnd to select on for an active-low enable. 2 iset current-limit programming input. connect a resistor from iset to gnd to set the internal current limit. the valid range for r iset is 26k to 60k . 3on enable input. drive on high to enable the device when sel is high. drive on low to enable the device when sel is low. 4in power-supply input. connect to an input power supply in the 2.75v to 5.5v range. bypass in to gnd with a 1? or greater ceramic capacitor. 5 out power output. bypass out to gnd with a 1? or greater capacitor. out is high impedance during shutdown. 6 fault open-drain fault-indicator output. fault is low when the input is below uvlo, or during current limit, reverse current detection, or thermal shutdown. 7 gnd ground. connect gnd to the exposed paddle and to a ground plane. 8 enreset auto-restart enable input. drive enreset high to enable auto-restart mode. drive enreset low to disable auto-restart mode. ep exposed pad. connect the exposed pad to a large ground plane to improve thermal power dissipation. functional diagram current- limit circuitry control logic max8586 o.5v fault enreset iset out n 25ma sel in on gnd charge pump oscillator auto- restart circuitry thermal- shutdown circuitry + - 20ms timer uvlo
max8586 single 1.2a usb switch in 3mm x 3mm tdfn 8 _______________________________________________________________________________________ detailed description current-limit protection the max8586 uses two methods to protect the circuit from overcurrent conditions. continuous current limiting has tighter accuracy but slower response time com- pared to short-circuit limiting. combining both methods provides a high degree of protection for a variety of faults. when a current-limit fault occurs with v out greater than 1v, the device operates in continuous cur- rent-limit mode and limits output current to a user-pro- grammable level. when v out is less than 1v, the device operates in short-circuit current-limit mode and pulses the output current to levels that are 30% (typ) higher than the selected continuous current limit. when either fault condition persists for 20ms (typ), the fault flag is asserted. with the auto-restart enabled (enreset high) the output also latches off and is test- ed with a 25ma current to detect when the fault condi- tion has been removed. 20ms after the fault condition is removed, the output automatically restarts. with the auto-restart disabled (enreset low), the output contin- ues to source the current-limit current as long as the fault is present. reverse current protection the usb specification does not allow an output device to source current back into the usb port. however, the max8586 is designed to safely power noncompliant devices. during normal operation with the channel enabled, if the current from the output to the input exceeds 1a (typ) for more than 20ms (typ), the ic turns off the switch and the fault flag is asserted. when the ic is disabled, the output is switched to a high-imped- ance state, blocking reverse current flow from the out- put back to the input. on/off control and uvlo the max8586 has a selectable active-high/low on polarity. drive sel high to select an active-high for on; drive sel low to select active-low for on. the max8586 includes a uvlo circuit to prevent erroneous switch operation when the input voltage goes low dur- ing startup and brownout conditions. input voltages of less than +2.5v (typ) inhibit operation of the device. fault asserts low during a uvlo condition. output fault protection and auto-restart the max8586 uses an auto-restart function to detect short-circuit removal by sourcing 25ma from the output and monitoring the output voltage. when the voltage at the output exceeds 0.5v for 20ms, the fault flag releases, the output turns back on, and the 25ma current source turns off. active loads are not expected to draw measur- able current when supplied with less than 0.5v. the auto- restart function is enabled when enreset is high. drive enreset low to disable the auto-restart function. when the auto-restart function is disabled, out regulates the current to the programmed current limit. fault indicator and fault blanking the max8586 provides an open-drain output ( fault ) to signal fault conditions. connect fault to in through a 100k pullup resistor for most applications. fault asserts low when any of the following conditions occur: the input voltage is below the uvlo threshold. the switch junction temperature exceeds the +160? thermal-shutdown temperature limit. the switch is in current-limit or short-circuit current- limit mode for longer than the fault-blanking period (20ms typ). the reverse current exceeds the 1a threshold for longer than the fault-blanking period (20ms typ). when auto-restart is enabled, the fault output goes high impedance after a 20ms delay once the fault con- dition is removed. with auto-restart disabled, during the fault the output is tested every 20ms. when the fault is removed, the fault output goes high impedance after a delay that can be up to 20ms. ensure that the max8586 input bypass capacitance prevents glitches from triggering the fault output. to distinguish large capacitive loads from short circuits or sustained over- loads, the max8586 has a fault-blanking circuit. when a load transient causes the output to enter current limit, an internal counter monitors the duration of the fault. for load faults exceeding the 20ms fault-blanking time, the switch turns off, fault asserts low, and the output enters auto-restart mode (see the current-limit protection and output fault protection and auto-restart sections). only current-limit and short-circuit faults are blanked. thermal-overload faults and input voltages below the uvlo threshold immediately turn the output off and assert fault low. fault blanking allows the max8586 to handle usb loads that might not be fully compliant with usb specifi- cations. the max8586 successfully powers usb loads with additional bypass capacitance and/or large start- up currents while protecting the upstream power source. no fault is reported if the switch brings up the load within the 20ms blanking period.
max8586 single 1.2a usb switch in 3mm x 3mm tdfn _______________________________________________________________________________________ 9 thermal shutdown when the max8586 die temperature exceeds +160?, the switch turns off and fault goes low. thermal shut- down does not utilize the 20ms fault-blanking timeout period. when the junction temperature cools by 15?, the switch turns on again and fault returns high. when an overload condition persists, the switch cycles on and off, resulting in a pulsed output that reduces the average system load. applications information setting the current limit a resistor from iset to ground programs the current- limit value. use a resistor between 26k and 60k to set the current limit according to the formula: i lim(typical) = 36400 / r iset (amps) do not use r iset values below 26k because the maxi- mum current rating of the device may be exceeded. r iset values larger than 60k are not recommended and do not provide a lower limit current than 500ma. if the output drops below 1v (typ), the max8586 shifts to a short-circuit current-limit threshold that is 30% above the programmed level given by the i lim(typical) formula. input power supply and capacitance to limit the input voltage drop during momentary output load transients, connect a capacitor from in to ground. a 1? ceramic capacitor is required for local decou- pling; however, higher capacitor values further reduce the voltage drop at the input. when driving inductive loads, a larger capacitance may be needed to prevent voltage spikes from exceeding the max8586? absolute maximum ratings. output capacitance a capacitor as large as 500? is allowed on the output to smooth out transients and/or increase rise/fall times. larger output capacitance may be used, but the result- ing output charge time during startup may exceed the fault-blanking period resulting in a fault flag. driving inductive loads a wide variety of devices (mice, keyboards, cameras, and printers) typically connect to the usb port with cables, adding an inductive component to the load. this inductance causes the output voltage at the usb port to oscillate during a load step. the max8586 drives induc- tive loads; however, care must be taken to avoid exceeding the device? absolute maximum ratings. usually, the load inductance is relatively small, and the max8586? input includes a substantial bulk capaci- tance from an upstream regulator as well as local bypass capacitors, limiting overshoot. if severe ringing occurs because of large load inductance, clamp the max8586 output below +6v and above -0.3v. turn-on and turn-off behavior the max8586 features a slow turn-on and turn-off, mini- mizing loading transients on the upstream power source. sel sets the active polarity of the logic inputs of the max8586. drive on to the same logic state as sel to enable the output. drive on to the opposite logic state as sel to disable the output (see table 1). the output enters a high-impedance state when disabled. layout and thermal dissipation keep all input/output traces as short as possible to reduce the effect of undesirable parasitic inductance and optimize the switch response time to output short- circuit conditions. place input and output capacitors no more than 5mm from device leads. connect in and out to the power bus with short traces. wide power bus planes at in and out provide superior heat dissipation as well. an active switch dissipates little power with mini- mal change in package temperature. calculate the power dissipation for this condition as follows: p = i out 2 x r on at the normal operating current (i out = 0.5a) and the maximum on-resistance of the switch (95m ), the power dissipation is: p = (0.5a) 2 x 0.95 = 24mw the worst-case power dissipation occurs when the out- put current is just below the current-limit threshold with an output voltage greater than 1v. in this case, the power dissipated in the switch is the voltage drop across the switch multiplied by the current limit: p = i lim x (v in - v out ) for a 5.5v input and 1v output, the maximum power dissipation is: p = 1.6a x (5.5v - 1v) = 7.2w sel on out state high high enabled high low disabled low high disabled low low enabled table 1. sel/on inputs
because the package power dissipation is 1951mw, the max8586 die temperature exceeds the +160? thermal- shutdown threshold when dissipating 7.2w, and the switch output shuts down until the junction temperature cools by 15?. the duty cycle and period are strong functions of the ambient temperature and the pc board layout (see the thermal shutdown section). if the output current exceeds the current-limit threshold, or the output voltage is pulled below the short-circuit detect threshold, the max8586 enters a fault state after 20ms, at which point auto-restart mode is enabled and 25ma is sourced by the output to test for removal of the overload. for a 5v input, out short circuited to gnd, and auto-restart mode active, the power dissipation is as follows: p = 0.025a x 5v = 0.125w max8586 single 1.2a usb switch in 3mm x 3mm tdfn 10 ______________________________________________________________________________________ chip information transistor count: 2117 process: bicmos input supply 2.75v to 5.5v output fault indicator on/off polarity selection control/ on/off output supply up to 1.2a in out enreset iset fault max8586 sel on gnd auto-restart on/off r2 26k r1 100k c2 1 f c1 1 f figure 1. typical application circuit sel iset on in enreset gnd fault out max8586 tdfn 8 7 5 1 2 6 3 4 top view pin configuration
max8586 6, 8, &10l, dfn thin.eps single 1.2a usb switch in 3mm x 3mm tdfn ______________________________________________________________________________________ 11 package type package code document no. 8 tqfn-ep t833-2 21-0137 package information for the latest package outline information and land patterns, go to www.maxim-ic.com/packages .
max8586 single 1.2a usb switch in 3mm x 3mm tdfn 12 ______________________________________________________________________________________ common dimensions symbol min. max. a 0.70 0.80 d 2.90 3.10 e 2.90 3.10 a1 0.00 0.05 l 0.20 0.40 pkg. code n d2 e2 e jedec spec b [(n/2)-1] x e package variations 0.25 min. k a2 0.20 ref. 2.00 ref 0.250.05 0.50 bsc 2.300.10 10 t1033-1 2.40 ref 0.200.05 - - - - 0.40 bsc 1.700.10 2.300.10 14 t1433-1 1.500.10 mo229 / weed-3 0.40 bsc - - - - 0.200.05 2.40 ref t1433-2 14 2.300.10 1.700.10 t633-2 6 1.500.10 2.300.10 0.95 bsc mo229 / weea 0.400.05 1.90 ref t833-2 8 1.500.10 2.300.10 0.65 bsc mo229 / weec 0.300.05 1.95 ref t833-3 8 1.500.10 2.300.10 0.65 bsc mo229 / weec 0.300.05 1.95 ref 2.300.10 mo229 / weed-3 2.00 ref 0.250.05 0.50 bsc 1.500.10 10 t1033-2 package information (continued) for the latest package outline information and land patterns, go to www.maxim-ic.com/packages .
max8586 single 1.2a usb switch in 3mm x 3mm tdfn 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. maxim integrated products, 120 san gabriel drive, sunnyvale, ca 94086 408-737-7600 ____________________ 13 2009 maxim integrated products maxim is a registered trademark of maxim integrated products, inc. revision history revision number revision date description pages changed 0 11/04 initial release 1 1/09 added automotive part number 1

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