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california micro devices preliminary cm3511 ? 2002 california micro devices corp. all rights reserved. c0970500 11/10/03 430 n. mccarthy blvd, milpitas, california 95035 tel: (408) 263-3214 fax: (408) 263-7846 www.c almicro.com 1 dual usb overcurrent switch 1.2a (v cc ) / 200ma (v sby ) features ? dual outputs, each with independent over-current protection circuitry and indicator ? supports standby mode in pcs so that a peripheral can ramp down safely to a current <100ma ? up to 1.2a (v cc ) / 200ma (v sby ) continuous current on each output ? over-current limits at 1.2a / 200ma respectively ? 10msec min fault blanking delay on oc# outputs prevents false overcurrent alarms ? prevents backdrive current when host powered off ? low operating current (95 a typ.) ? small 8-lead soic package applications ? pc motherboards, notebooks, set-top-boxes the cm3511 also prevents backdrive current flowing into the host from the connected peripheral. this can occur when v cc is removed as the host powers down, and the peripheral still has normal power applied. the 5v from the peripheral can therefore be linked to the host?s v bus , potentially causing backdrive current into the host and overloading the peripheral power supply. pin diagram product description california micro devices? cm3511 is a dual port usb overcurrent power switch that selects between two independent 5v inputs available on a pc, depending on the state of a logic input (sel). the device has two pairs of power switches, and each pair is an analog ?or? function, providing a continuous voltage at both outputs during power transfer between inputs. v cc is the main 5v supply, which can be disabled in a pc, and v sby is the 5v standby supply which is powered up whenever the pc has power. when the ?sel? pin is at logic high, v cc is the assigned input power supply. when ?sel? is at logic low, v sby is used to power the output, and no current is taken from v cc . both switches can be deselected and switched off by not driving (floating) the ?sel? input, which places the chip in low power mode. both pairs of switches have over-current protection. depending on whether ?sel? is high or low, a current over 1.2a or 200ma respectively out of either output causes the device to enter a constant-current mode, where the output voltage is progressively reduced to prevent the current from increasing further. each output is independent of the other, so if one of the switches is switched on but is not in overcurrent mode then it will remain switched on. the oc# output becomes active only if the overcurrent condition exceeds a minimum continuous duration of 10ms. if the overcurrent condition is severe enough that the part heats up to the thermal limit t max , the switch turns off and the temperature cools down to t min . the switch then turns on again, and the device heats up again, and so on, until the fault is removed. typical application circuit simplified electrical schematic oc1# v out1 oc2# v out2 v cc sel gnd v sb y soic-8 top 2 usb ports v bus v bus 2 usb ports v cc sel gnd v sb y oc1# v out1 oc2# v out2 5v v cc 5v v sb y select v cc sel oc1# v out1 v cc h over current protect l over current protect oc2# v out2 v sb y h over current protect l over current protect cp cp
california micro devices preliminary cm3511 ? 2003 california micro devices corp. all rights reserved 11/10/03 430 n. mccarthy blvd, milpitas, california 95035 tel: (408) 263-3214 fax: (408) 263-7846 www.calmicro.com 2 absolute maximum ratings parameter rating unit esd protection (all pins, hbm) 2000 v v cc , v sby input voltage + 5.6, gnd - 0.5 v storage temperature range operating ambient operating junction -55 to +150 -40 to +85 -40 to +150* c output current loading internally limited a package power dissipation 0.5 w * - internally limited operating conditions (unless specified otherwise) parameter range unit v cc , v sby input voltage 4.5 to 5.5 v ambient temperature -40 to +85 c i load per port v cc v sby 0 to 1200 0 to 200 ma electrical operating characteristics (over operating conditions unless specified otherwise) symbol parameter conditions min typ max unit uvlo v cc /v sby voltage under which circuit locks out - will not operate 2.2 2.5 v v out1 , v out2 output voltage i load = 1000ma, v cc = 5.0v, sel = 5v, t = 25 c 4.8 v r sw1 v cc switch on-resistance i load = 0 to 1200ma; v cc = 5v t=25 c 0.13 0.20 ? r sw2 v sby switch on-resistance i load = 0 to 200ma; v sby = 5v t = 25 c 0.7 1.4 ? i lim vcc v cc over-current limit v cc = 5v sel = high 1200 ma i lim vsby v sby over-current limit v sby = 5v sel = low 200 ma t fbd time delay from overcurrent detection to oc# output indication (fault blanking delay) 10 20 ms t max temperature at which hot switch turns off during overcurrent 150 c t min temperature at which cool switch turns on, after cooling from t max 125 c i r cc i r sby reverse leakage from outputs to inputs ? backdrive current v cc = 0v, v out = 5v, sel floating v sby = 0v, v out = 5v, sel floating 1 1 a i cc on v cc operating supply current 95 a i sby off v sby standby supply current v cc = 5v, v sby < v cc , sel = high, i load = 0ma 1 a i sby on v sby operating supply current 95 a i cc off v cc standby supply current v sby = 5v, v sby >v cc , sel = low, i load = 0ma 1 a i cc h q v cc higher, quiescent current 40 a i sby l q v sby lower, quiescent current v cc = 5v, v sby < v cc , sel floating 1 a i cc l q v cc lower, quiescent current 1 a i sby h q v sby higher, quiescent current v cc = 5v, v sby >v cc , sel floating 40 a v ih-en en# input logic-1 threshold v cc = 5v 2 v v il-en en# input logic-0 threshold v cc = 5v 0.8 v i ohz-oc oc# output off state leakage v cc = 5v, v out = 5v 1.0 ua v ol-oc oc# output logic-0 threshold i oc = 1ma to v cc 0.4 v note: the internal supply current is taken from whichever input (v cc or v sby ) is higher.
california micro devices preliminary cm3511 ? 2003 california micro devices corp. all rights reserved 11/10/03 430 n. mccarthy blvd, milpitas, california 95035 tel: (408) 263-3214 fax: (408) 263-7846 www.calmicro.com 3 pin functions v cc is the higher current power source. whenever the sel pin is above 2v it will be selected, and v sby will be deselected. v sby is the lower current power source. whenever the sel pin is below 0.8v it will be selected, and v cc will be deselected. the two v sby power switches can only supply 200ma each. note that the internal supply current (95ua typ.) will be taken from whichever input supply pin (v cc or v sby ) is higher. v sb v out1 provides the power for a usb port. the internal mosfet switches are designed for low voltage drops from the voltage input pins at their full rated currents. v out2 provides the power for a second usb port. the internal mosfet switches are designed for low voltage drops from the voltage input pins at their full rated currents. current loads of up to 1.2a are allowed (sourced from vcc). current loads above 1.2a may cause the constant- current limiting circuit to operate ? reducing the output voltage. continuous over-current loads will cause the part?s internal temperature to rise. if the internal temperature exceeds 150?c then any switch that is in overcurrent mode will be immediately turned off. any switch that is not in overcurrent mode will remain on ? it will not be affected by the over-temperature detection. once the part has cooled to 125?c then the switch or switches that were in overcurrent mode will be automatically turned on again. during the cold-start interval when the input is initially applied, internal circuitry provides a soft turn-on for the switches, which limits peak in-rush current. sel is the 3-level logic input pin that is used to control which of the power switch pairs are turned on. set sel high to select v cc , set sel low to select v sby , or allow sel to float to deselect both power switches. the external device driving the sel pin must able to source and sink 100 a while maintaining the proper v il /v ih levels. oc1#, oc2# are independent, active low open- drain outputs, indicating an overcurrent fault condition has been detected at v out1 or v out2 . there is a built- in 10msec (min.) fault blanking period after the overcurrent fault condition has been detected, before these outputs become active. the oc# outputs become deasserted only when both the overcurrent condition stops and when the voltage drop across the switch is less than 1v. external pull-up resistors of 10k - 100k are required if the oc# outputs are used. because they are open-drain, the two oc# outputs can be shorted together to make one oc# signal. gnd is the negative reference for all voltages. pin functions pin no. symbol description 1 gnd negative reference for all voltages. 2 v cc high current positive supply input. 3 v sby standby positive supply input. also provides internal power. 4 sel 3-level logic input. high = v cc , low = v sby , floating = both off 5 oc2# active low when v out2 is in overcurrent mode. 6 v out2 output voltage internally switched to either v cc or v sby input source. 7 v out1 output voltage internally switched to either v cc or v sby input source. 8 oc1# active low when v out1 is in overcurrent mode. standard part ordering information pins package ordering part number 1 part marking 8 soic CM3511-04SN CM3511-04SN
california micro devices preliminary cm3511 ? 2003 california micro devices corp. all rights reserved 11/10/03 430 n. mccarthy blvd, milpitas, california 95035 tel: (408) 263-3214 fax: (408) 263-7846 www.calmicro.com 4 note 1: parts are shipped in tape & reel form unless otherwise specified. oc# response to momentary overcurrent fault i out v out oc# dietemp. >1200ma <150?c v out drops to reduce i out oc# goes inactive as soon as overcurrent condition stops <1200ma oc# goes active after 10ms (min) 20ms (typ.) delay i out v out oc# die temp. t max = 150?c t min = 125?c 150?c oc# response to continuous overcurrent fault v out drops to reduce i out total powerdown when over-temperature limit reached re-powers when temperature drops to 125?c oc# goes active after 10ms (min) 20ms (typ.) delay oc# stays low note: the other port stays on (unless it is also in current limit.) >1200ma
california micro devices preliminary cm3511 ? 2003 california micro devices corp. all rights reserved 11/10/03 430 n. mccarthy blvd, milpitas, california 95035 tel: (408) 263-3214 fax: (408) 263-7846 www.calmicro.com 5 typical operating characteristics v cc on-resistance 100 110 120 130 140 150 160 170 180 190 -40 -20 0 20 40 60 80 100 120 140 temperature ['c] resistance [milliohms] vcc=5.5v vcc=5.0v vcc=4.5v vcc=4.0v v sby on-resistance 500 550 600 650 700 750 800 850 900 950 -40 -20 0 20 40 60 80 100 120 140 temperature ['c] resistance [milliohms] vsby=5.5v vsby=5.0v vsby=4.5v vsby=4.0v
california micro devices preliminary cm3511 ? 2003 california micro devices corp. all rights reserved 11/10/03 430 n. mccarthy blvd, milpitas, california 95035 tel: (408) 263-3214 fax: (408) 263-7846 www.calmicro.com 6 vout-iout characteristic (sel=5v, vcc active) 0 1 2 3 4 5 6 0 0.5 1 1.5 2 2.5 3 3.5 i ou [a] v out [v] vout-iout characteristic (sel=0v, vsby active) 0 1 2 3 4 5 6 0 0.1 0.2 0.3 0.4 0.5 0.6 i out [a] v out [v]
california micro devices preliminary cm3511 ? 2003 california micro devices corp. all rights reserved 11/10/03 430 n. mccarthy blvd, milpitas, california 95035 tel: (408) 263-3214 fax: (408) 263-7846 www.calmicro.com 7 i cc vs. v cc 20 30 40 50 60 70 80 90 100 110 120 4 4.2 4.4 4.6 4.8 5 5.2 5.4 5.6 v cc [v] i cc [ua] idd(sel=vcc) idd(sel=floats) supply current 0 20 40 60 80 100 120 -40 -20 0 20 40 60 80 100 120 temperature ['c] current [ua] vcc=5.0v sel=float vcc=4.0v sel=float vcc=5.0v sel=0v vcc=4.0v sel=0v vcc=5.0v sel=5v vcc=4.0v sel=4v
california micro devices preliminary cm3511 ? 2003 california micro devices corp. all rights reserved 11/10/03 430 n. mccarthy blvd, milpitas, california 95035 tel: (408) 263-3214 fax: (408) 263-7846 www.calmicro.com 8 oc# fault blanking period 0 5 10 15 20 25 30 35 40 3.5 3.7 3.9 4.1 4.3 4.5 4.7 4.9 5.1 5.3 5.5 v cc [v] delay [msec] oc# fault blanking period 0 5 10 15 20 25 -40 -20 0 20 40 60 80 100 120 140 temperature ['c] time [milliseconds] vcc=5.0v vcc=4.0v undervoltage lock-out (uvlo) 1.95 2 2.05 2.1 2.15 2.2 2.25 -40 -20 0 20 40 60 80 100 120 140 temperature ['c] supply voltage v cc or v sby [v]
california micro devices preliminary cm3511 ? 2003 california micro devices corp. all rights reserved 11/10/03 430 n. mccarthy blvd, milpitas, california 95035 tel: (408) 263-3214 fax: (408) 263-7846 www.calmicro.com 9 v cc turn-on time 0 50 100 150 200 250 -40-200 20406080 temperature ['c] time [usec] vcc=5.5v vcc=4.5v v sby turn-on time 0 1 2 3 4 5 -40-20 0 20406080 temperature ['c] time [usec] vsby=5.5v vsby=4.5v v cc turn-off time 0.0 1.0 2.0 3.0 4.0 5.0 -40-200 20406080 temperature ['c] time [usec] vcc=5.5v vcc=4.5v
california micro devices preliminary cm3511 ? 2003 california micro devices corp. all rights reserved 11/10/03 430 n. mccarthy blvd, milpitas, california 95035 tel: (408) 263-3214 fax: (408) 263-7846 www.calmicro.com 10 v sby turn-off time 0 10 20 30 40 50 -40-200 20406080 temperature ['c] time [usec] vsby= 5.5v vsby= 4.5v turn-on time vs. v cc 0 20 40 60 80 100 120 140 160 180 44.555.5 v cc [v] time [usec] cout=0.1u cout=1u turn-on time vs. v sby 0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 4 4.5 5 5.5 v sby [v] time [usec] cout=0.1u cout=1u
california micro devices preliminary cm3511 ? 2003 california micro devices corp. all rights reserved 11/10/03 430 n. mccarthy blvd, milpitas, california 95035 tel: (408) 263-3214 fax: (408) 263-7846 www.calmicro.com 11 turn-off time vs. v cc 0 5 10 15 20 25 30 44.555.5 v cc [v] time [usec] cout=0.1u cout=1u turn-off time vs. v sby 0 50 100 150 200 250 300 44.555.5 v sby [v] time [usec] cout=0.1u cout=1u
california micro devices preliminary cm3511 ? 2003 california micro devices corp. all rights reserved 11/10/03 430 n. mccarthy blvd, milpitas, california 95035 tel: (408) 263-3214 fax: (408) 263-7846 www.calmicro.com 12 normaliz ed overcurrent indicator trip point (v cc ) 0.50 0.60 0.70 0.80 0.90 1.00 1.10 1.20 1.30 1.40 1.50 -40 -20 0 20 40 60 80 100 120 temperature ['c] current [normalized] vcc=5.5v vcc=4.5v normaliz ed overcurrent indicator trip point (v sby ) 0.80 0.85 0.90 0.95 1.00 1.05 1.10 1.15 1.20 -40 -20 0 20 40 60 80 100 120 temperature ['c] current [normalized] vsby=5.5v vsby=4.5v
california micro devices preliminary cm3511 ? 2003 california micro devices corp. all rights reserved 11/10/03 430 n. mccarthy blvd, milpitas, california 95035 tel: (408) 263-3214 fax: (408) 263-7846 www.calmicro.com 13 soic-8 package dimensions

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