unisonic technologies co., ltd us2175 cmos ic www.unisonic.com.tw 1 of 10 copyright ? 2010 unisonic technologies co., ltd qw-r502-403.b dual usb high-side power switch ? description the us2175 is a high-side power switch with two channels. it particularly designed for the universal serial bus (usb) including self-powered and bus-powered types. the r ds(on) of the mosfet switch is as low as 110m ? . the us2175 incorporates protective functions, such as overcurrent protection, thermal s hutdown and uvlo (undervoltage lockout) protection circuits. the thermal shutdown function provides individual control for each switch. an open-drain fault flag playing a role as the output of an n-channel is also included. once any error occurs the fault flag will be in active. the us2175 can be applied in hot plug in power supplies and battery charger circuits as well. sop-8 ? features * open-drain fault flag. * high-side mosfet switch with 5v input voltage * 110m ? r ds(on) meets usb voltage drop requirements for maximum transmission wire length * load current: 500ma * output can be forced high er than input (off-state) * on-state supply current: 65 a (typ.) * off-state supply current:.1 a (typ.) * current-limit / short circuit protection and therma l shutdown protection under overcurrent condition * uvlo makes the swit ch off at start up * with slow turn on and fast turn off * enable active-low or active-high * halogen free ? ordering information ordering number package packing US2175XG-S08-R sop-8 tape reel
us2175 cmos ic unisonic technologies co., ltd 2 of 10 www.unisonic.com.tw qw-r502-403.b ? pin configuration 1 out(1) ctl(2) ctl(1) flg(1) flg(2) in gnd out(2) 2 3 4 5 6 7 8 ? pin description pin no. pin name description 1 ctl(1) switch a control input: logic-compat ible, active-low or active-high. ttl input 2 flg(1) fault detection flag (1) (output): ac tive-low. n-ch open -drain. indicates over-current, thermal shutdown. 3 flg(2) fault detection flag (2) (output): ac tive-low. n-ch open -drain. indicates over-current, thermal shutdown. 4 ctl(2) switch b control input: logic-compat ible, active-low or active-high. ttl input 5 out(2) switch b output: drain of mosfet for output. usually, connected to load 6 gnd power ground. 7 in power supply input. 8 out(1) switch a output: drain of mosfet for output. usually, connected to load
us2175 cmos ic unisonic technologies co., ltd 3 of 10 www.unisonic.com.tw qw-r502-403.b ? block diagram
us2175 cmos ic unisonic technologies co., ltd 4 of 10 www.unisonic.com.tw qw-r502-403.b ? absolute maximum rating parameter symbol ratings unit supply voltage v cc 7 v control input voltage v ctl -0.3~ +6.5 v fault flag voltage v flg 7 v power dissipation (ta = 25c) p d 625 mw junction temperature t j +125 c ambient operating temperature t opr -40 ~ +85 c storage temperature t stg -65~ +150 c note: absolute maximum ratings are those values beyond which the device could be permanently damaged. absolute maximum ratings are stress ratings only and functional device oper ation is not implied. ? thermal data parameter symbol ratings unit junction to ambient (no heatsink) ja 160 c/w ? electrical characteristics (v in = 5v, ta = 25c, unless otherwise specified) parameter symbol test conditions min typ max unit i off out=open 1 5 a supply current i on out=open 65 100 a v il v ctl =logic ?0? 0.8 v control input voltage v ih v ctl =logic ?1? 2.4 v i il v ctl =logic ?0? 0.01 1 a control input current i ih v ctl =logic ?1? 0.01 1 a control input capacitance c i 1 pf output mosfet resistance r on i out = 500ma 110 150 m ? output turn-on rise delay t d_on r l =10 ? each output 40 s output turn-on rise time t on r l =10 ? each output 500 s output turn-off delay t d_off r l =10 ? each output 1 20 s output turn-off fall time t off r l =10 ? each output 1 20 s output leakage current i i(leak) 0.5 10 a current limit threshold i limit v out =4v 1.3 2 a short current i sc v out =0v 1 a t j increasing 135 c over temperature shutdown threshold t sd t j decreasing 115 c v in =5v, i l =10ma 15 80 ? error flag output resistance r flg v in =3.3v, i l =10ma 20 100 ? error flag off current i flg_off v flg =5v 0.01 1 a v in increasing 2.6 v uvlo threshold v uvlo v in decreasing 2.4 v
us2175 cmos ic unisonic technologies co., ltd 5 of 10 www.unisonic.com.tw qw-r502-403.b ? test circuits (1) r fg v flg s1 v out r l i l c out + a i out v out gnd ctl flg in c in + v in v ce (2) (3) v out gnd ctl flg in + v in c in v + c out i out v rds(on) v ce (4) gnd ctl in v ce + v in c in v out flg v out r l i l c out + v flg r fg (5) note: above test circuits reflected the graphs sh own on ?typical characteristics? are as follows: (1) on-state supply current vs. input voltage & temperature, off-state supply current vs. input voltage & temperature (2) flag trigger & release response, inrush current at start-up (3) ramped load response, short- current response at start-up (4) thermal shutdown response, turn off response, turn on response (5) short circuit current response, ramped load response, thermal shutdown response
us2175 cmos ic unisonic technologies co., ltd 6 of 10 www.unisonic.com.tw qw-r502-403.b ? typical application circuit ctl(2) gnd out(2) flg(2) flg(1) ctl(1) out(1) in us2175 v in on/off usb controller overcurrent overcurrent gnd on gnd in out lr1116b gnd v bus d+ d- gnd d- d+ v bus ferrite bead 4.50v ~ 5.25v upstream v bus 100ma max gnd v bus d+ d- 1 f 33 f + + v cc 5.0v 10k 10k usb port1 usb port2 data (two pair) to usb controller data 1 f 0.1 f 0.01 f 33 f 0.01 f 33 f
us2175 cmos ic unisonic technologies co., ltd 7 of 10 www.unisonic.com.tw qw-r502-403.b ? application information fault flag the fault flag mainly protects the system from damage ca used by such status as thermal shutdown, overcurrent. current limit the current limit function prevents both excessive in -rush current caused by the plug-in events and the short-circuit status for mosfet switc hes. the current limit threshold is fixed internally, allowing a 1a minimum current to flow through the mosfet switches. thermal shutdown both thermal shutdown circuits turn both mosfet switches off if the temperature rise s approximately 135c, at the same time flg pin becomes active. 10c of hysteresis ensures the mosfets will not turn on again until the chip temperature is reduced to 125c. under overcurrent fault conditions, the t hermal shutdown will turn off the mosfet switch which is in this status due to temperature rise, t he other keeps its state. supply filtering in order to control supply transients, a bypass capacit or placed between in pin and gnd pin is suggested. 0.1 f to 1 f is suitable. without a bypass capacitor, an output short may cause sufficient ringing on the input (from supply lead inductance) to damage internal control circuitry. transient requirements ferrite beads are recommended in series with all power and ground connector pins to prevent emi and excessive in-rush current generated fr om input capacitance of down stream during a hot plug-in event. the usb devices support dynamic attachment (hot plug-in) of peripherals. . short circuit transient a 33 f/16v tantalum or a 100 f/10v electrolytic capacitor located closely to downstream connector for each port is recommended to provide transient protection and a bul k capacitance provides the short-term transient current needed during a hot-attachment event. printed circuit layout to meet the requirements for power circuitry of usb pr inted circuit boards, maximum thermal consumption and minimum voltage drop and emi is required.
us2175 cmos ic unisonic technologies co., ltd 8 of 10 www.unisonic.com.tw qw-r502-403.b ? typical characteristics on-state supply current, i son ( a) on-state supply current, i son ( a) 34 5 6 0 input voltage, v dd (v) off-state supply current vs. input voltage 0.01 0.02 0.03 0.04 0.05 -40 0 0.1 temperature ( ) off-state supply current vs. temperature -20 20406080100120 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 0
us2175 cmos ic unisonic technologies co., ltd 9 of 10 www.unisonic.com.tw qw-r502-403.b ? typical characteristics (cont.) flag trigger & release response r l =0 c out =100 f v out flag i out inrush current at start-up v out ctl i out r l =10 c out =100 f v out flag i out v out flag i out thermal shutdown response v out flag i out c out =100 f turn off response v out ctl r l =10
us2175 cmos ic unisonic technologies co., ltd 10 of 10 www.unisonic.com.tw qw-r502-403.b ? typical characteristics (cont.) turn on response r l =10 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.
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