unisonic technologies co., ltd us211/a/b/c preliminary cmos ic www.unisonic.com.tw 1 of 8 copyright ? 2014 unisonic technologies co., ltd qw-r502-a67.a high-side power switches with flag ? description the utc us211/a/b/c series are 80m ? high-side power switches. there?s internal single low voltage n-channel mosfet which makes it an ideal for all usb applications. this mosfet should be driven by a charge pump circuitry inside. its switch on resistance is as low as 80m ? which we know specially meets the drop voltage for usb applications. the flag pin can output an open-drain fault flag to next controller. there?re lots internal special ways for protecting the chip?s operation. when in hot-plug events, there?s large current which can create the upstream voltage droop to match the usb?s voltage droop requirements and soft-start for isolating the power source. as soon as the die temper ature is higher than 130 , the internal shutdown circuit will work. only when there?s a normal input voltage in the v in pin, the uvlo (under-voltage lockout, 1.3v/2.5v typ.) can make sure the chip is till in the off state. because of the requirement of usb power the fault current should be ensured less than 0.6a/1.1a (utc us211/a , single port) and 1.3a /1.5a (utc us211b/c , dual ports). ? features * 80m ? (typ) n-channel mosfet * supply current: ? switch on : 25 a(typ) ? switch off : 1 a (typ) * load current 500ma for us211 and 1.0a for US211A/b/c * input voltage from 2v ~ 5.5v * in off-state: output volt age can be higher than input ? ordering information ordering number package packing lead free halogen free us211xxl-af5-r us211xxg-af5-r sot-25 tape reel free datasheet http://
us211/a/b/c preliminary cmos ic unisonic technologies co., ltd 2 of 8 www.unisonic.com.tw qw-r502-a67.a ? marking 3 2 1 5 4 u1 current code: 1: 0.6a, a: 1.1a, b: 1.3a, c: 1.5a logic level enable pin g: halogen free l : lead free ? pin configuration 3 2 1 4 5 flg gnd ctl v out v in ? pin description pin no pin name description 1 ctl enable input pin, h: high active, l: low active 2 gnd ground 3 flg open-drain fault flag output 4 v in power input voltage 5 v out output voltage ? block diagram free datasheet http://
us211/a/b/c preliminary cmos ic unisonic technologies co., ltd 3 of 8 www.unisonic.com.tw qw-r502-a67.a ? absolute maximum rating (t a =25c, unless otherwise specified) parameter symbol ratings unit supply voltage v cc 6.5 v +2 ~ +5.5 (note 2) v input/output pins vctl v ctl -0.3~ +6.5 v 0 ~ +5.5 (note 2) v v flg flg v 6.5 v junction temperature t j 150 c -20 ~ +100 (note 2) c storage temperature t stg -65 ~ +150 c notes: 1. 2. absolute maximum ratings are those values beyo nd which the device could be permanently damaged. absolute maximum ratings are stress ratings only an d functional device operat ion is not implied. the device is not guaranteed to function w hen it?s beyond its operating conditions. ? thermal data parameter symbol ratings unit junction to ambient ja 260 c/w junction to case jc 81 c/w ? electrical characteristics parameter symbol test conditions min typ max unit enable input ctl threshold low v il v in =2v~5.5v, switch off 0.8 v high v ih v in =2v~5.5v, switch on 2.0 v ctl input current i i ( ctl ) v ctl =0v~5.5v 0.01 a under voltage lock under-voltage lockout v uvlo v in increasing us211/ US211A 1.0 2.1 2.9 v us211b/ us211c 2.5 under-voltage hysteresis ? v uvlo v in decreasing 0.1 v supply current supply current i sw ( on ) switch on, v out =open 25 45 a i sw ( off ) switch off, v out =open 0.1 1 a output leakage current i o ( leak ) v ctl =0v, r load =0 ? 0.5 10 a current limit current limit i limit us211 0.6 0.8 1.1 a US211A 1.1 1.5 1.9 a us211b 1.3 1.7 2.1 a us211c 1.5 2.0 2.4 a short circuit fold-back current i sc(fb) v out =0v, measured prior to thermal shutdown us211 0.8 a US211A 1.0 a us211b 1.0 a us211c 1.3 a power switch switch on resistance r ds(on) i out = 500ma us211 80 110 m ? i out =1.0a US211A/b/c 80 110 m ? output turn-on rise time t on ( rise ) 10% ~ 90% of v out rising 400 s over current flag flag off current (off) flg i flg v=5v 0.01 1 a flag output resistance flg r i sink =1ma 20 400 ? flag delay time t d from fault condition to flg assertion 2 10 15 ms thermal shutdown thermal shutdown protection t sd 130 c thermal shutdown hysteresis ? t sd 20 c free datasheet http://
us211/a/b/c preliminary cmos ic unisonic technologies co., ltd 4 of 8 www.unisonic.com.tw qw-r502-a67.a ? application information input and output v in (input) is the power source connection to the in ternal circuitry and the drain of the mosfet. v out (output) is the source of the mosfet. in a typical application, current flows through the switch from v in to v out toward the load. because the mosfet is bidirectional when on, if v out is greater than v in , current will flow from v out to v in there is no a parasitic body diode of n-mosfet between the drain and source comp ared to a normal mosfet,. the us211 can protect damage from reverse current flow if v out being externally forced to a higher voltage than v in when the output disabled (v en > 2v). enable input the switch will be disabled when the en pin is in a logic low/high condition. during this condition, the internal circuitry and mosfet are turned off, re ducing the supply current to 0.1 a typical. floating the en may cause unpredictable operation. en should not be allowed to go negative with respect to gnd. the en pin may be directly tied to v in (gnd) to keep the part on. soft start for hot plug-in applications when hot-plug events occur, the soft start is used to eliminate the upstream voltage droop due to the inrush current. the soft-start protects power supplies from damage caused by highly capacitive loads. fault flag the fault flag is an open-drained output of an n-channel mo sfet. the flag drops low to indicate fault conditions: current limit, thermal shutdown or v out < v in ? 1v. in order to reduce energy drain, a large pull-up resistor is required. 100k ? pull-up resistor is recommended for most applications. in the case of over current condition, the fault flag is active only if the flag response delay time (t d ) has elapsed. this ensures that flg is asserted only upon valid over-c urrent conditions and that erroneous error reporting is eliminated. for example, false over-current conditions may occur during hot-plug events when extremely large capacitive loads are connected and causes a high transient inrush current that exceeds the current limit threshold. the flg response delay time t d is typically 10ms. free datasheet http://
us211/a/b/c preliminary cmos ic unisonic technologies co., ltd 5 of 8 www.unisonic.com.tw qw-r502-a67.a ? application information(cont.) current limiting and short-circuit protection the current limit circuit protects the mosfet switch an d the hub downstream port from damage. this circuit can deliver load current up to the current limit threshold of ty pically 0.8a through the switch of us211, 1.5a for US211A, 1.7a for us211b and 2.0a for us211c. when an enabled switch applies a heavy load or short circuit, a large-desired transient current occurs which can cause the current limit circuit response. if this current becomes higher than the current limit threshold, the devices enter co nstant current mode until thermal shutdown occurs or the fault is removed. thermal shutdown the thermal shutdown circuit is used to prevent damage occurs when the die temperature becomes higher than approximately 130c. after 20c of hysteresis, the switch will automatically restart if it enabled. when these devices are disabled or the fault is removed, the output and flg signal will continue to cycle on and off. free datasheet http://
us211/a/b/c preliminary cmos ic unisonic technologies co., ltd 6 of 8 www.unisonic.com.tw qw-r502-a67.a ? test circuit v in ctl gnd v out flg utc us211/a/b/c chip enable a v in c i r fg v flg s1 i out c o r l i l v out fig.1 turn-on & off response, flag response v in en gnd v out flg utc us211/a/b/c chip enable a a i supply c in v in v flg i leak age r l fig.2 supply current v in en gnd v out chip enable flg c in v in v v rds(on) i out c out utc us211/a/b/c fig.3 on-resistance free datasheet http://
us211/a/b/c preliminary cmos ic unisonic technologies co., ltd 7 of 8 www.unisonic.com.tw qw-r502-a67.a ? test circuit v in v ctl v in ctl gnd v out flg utc us211/a/b/c c i r fg v flg c o r l i l v out fig.4 uvlo at rising & falling v in v in ctl gnd v out flg utc us211/a/b/c c i r fg v flg c o r l i l v out s2 a i out s3 fig.5 current limit vs. input vo ltage, inrush current response, current limit transient response note: above test circuits reflected the graphs shown on ?typical operating characteristics? are as follows: fig . 1 turn-on rising & falling time vs. temperat ure, turn-on & off response, flag response. fig . 2 supply current vs. input voltage & temperature, switch off supply current vs. temperature, turn-off leakage current vs. temperature. fig . 3 on-resistance vs. input voltage & temperature. fig . 4 en threshold voltage vs. input voltage & temperature, flag delay time vs. input voltage & temperature, uvlo thres hold vs. temperature, uvlo at rising & falling. fig . 5 current limit vs. input voltage/temperature, short circuit current response, short circuit current vs. temperature, inrush current response, soft-start response, ramped load response, current limit transient response, thermal shutdown response. free datasheet http://
us211/a/b/c preliminary cmos ic unisonic technologies co., ltd 8 of 8 www.unisonic.com.tw qw-r502-a67.a ? typical application circuit supply voltage 5v ferrite beades 1f 10f 150f v bus d+ d- gnd data v in ctl gnd v out flg utc us211/a/b/c chip enable r fg pull-up resistor (10k ~ 100k) over - current flag transient filtering usb controller 0.1f 10k note. a low-esr 150 f aluminum electrolytic or tantalum between v out and gnd is strongly recommended to meet the 330mv maximum droop requirement in the hub v bus . utc assumes no responsibility for equipment failures that result from using products at values that exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or other parameters) listed in products specifications of any and all utc products described or contained herein. utc products are not designed for use in life support appliances, devices or systems where malfunction of these products can be reasonably expected to result in personal injury. reproduction in whole or in part is prohibited without the prior written consent of the copyright owner. the information presented in this document does not form part of any quotation or contract, is believed to be accurate and reliable and may be changed without notice. free datasheet http://
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