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power management SC704/sc705 500ma low vin, very low ron load switch ? 20 5 semtech corporation features input voltage range C . v to 3.6v 500ma continuous output current ultra-low ron C 90m automatic output discharge circuit fast turn-on option with no output discharge circuit C SC704 extended soft start option with automatic out - put discharge circuit C sc705 low shutdown quiescent current hardened esd protection 5kv package: csp C 0.76mm 0.76mm, 0.4mm pitch applications smart phones tablet pcs gps devices battery powered equipment other portable device ? ? ? ? ? ? ? ? ? ? ? ? ? ? description the SC704/sc705 is a low input voltage, low ron load switch, designed for use in battery powered applications. integrated circuitry controls the switch to minimize resis - tance over a wide range of conditions. the device provides controlled soft-start to limit inrush current. the sc705 features an automatic discharge circuit which discharges the output when the part is disabled. the SC704/sc705 is offered in an ultra-small 4-bump 0.76mm0.76mm chip scale package (csp) which enables very small board area implementations. the SC704/sc705 has an operating temperature range of -40 c to +85 c . sc 70 4 / sc 705 su pply load vou t vin en gn d en able vin 1 f 1 f typical application circuit rev. 2.4 device package automatic discharge rising time SC704 csp no 6.7s(typ.) sc705 csp yes 37s(typ.)
SC704/sc705 2 pin confguration marking information ordering information device package SC704cstrt csp 0.76mm0.76mm 4-bump sc705cstrt csp 0.76mm0.76mm 4-bump SC704evb evaluation board sc705evb evaluation board notes: () available in tape and reel only. a reel contains 5,000 devices. (2) lead-free packaging only. device is weee and rohs compliant, and halogen free. a 1 a 2 b 1 b 2 t o p v ie w ( b u m p s o n t h e b o t t o m ) csp 0.76x0.76, 4 bump SC704 sc705 marking for the 0.76 x 0.76 mm csp 4 lead package : o = pin id nn = part no. code (example: an) - reference part no. marking for the 0.76 x 0.76 mm csp 4 lead package : o = pin id nn = part no. code (example: ap) - reference part no.
SC704/sc705 3 exceeding the above specifcations may result in permanent damage to the device or device malfunction. operation outside of the parameters specifed in the electrical characteristics section is not recommended. notes: () tested according to jedec standard jesd22-a 4-b. (2) assumes 3 x 4.5 inch, 4 layer fr4 pcb per jesd5 with 4 mil ( 00 micron) width traces connected to ball pads. absolute maximum ratings vin to gnd . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3v to +4.3v en to gnd . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3v to +4.3v out to gnd . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3v to +v vin esd protection level () (kv) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 recommended operating conditions ambient temperature range (c) . . . . . . . . . -40 < t a < +85 v vin (v) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . to 3.6 cin input capacitance = uf thermal information thermal resistance, junction to ambient (2) (c/w) . . . 60 maximum junction temperature (c) . . . . . . . . . . . . . . + 25 storage temperature range (c) . . . . . . . . . . . . -65 to + 50 peak ir reflow temperature ( 0s to 30s) (c) . . . . . . . +260 unless otherwise noted v in = .8v, c in = f, c out = f, v en = v vin , t a = -40c to +85c. typical values are at t a = 25c. parameter symbol conditions min typ max units input supply voltage range v in . 3.6 v output voltage v out v in v maximum output current i max continuous current 500 ma on resistance (ron) r on v in =3.6v, i out = 200ma, v v en =.5v 64 m? v in =2.5v, i out = 200ma, v v en =.5v 72 m? v in = .8v, i out = 200ma, v v en =.5v 90 30 m? v in = .5v, i out = 200ma, v v en =.5v 98 m? v in = .2v, i out = 200ma, v v en =.0v 26 m? shutdown current i sd v en =0v , v out open, t a = 25c 0. a v en =0v , -40c <= t a <= 85c 2 a quiescent current i q () v in =v en =3.6v, v out open, -40c <= t a <= 85c 2 a enable en input high threshold v ih . v enable input low threshold v il 0.3 v electrical characteristics
SC704/sc705 4 parameter symbol conditions min typ max units en input pull-down resistance r en 5 m? SC704 turn-on delay time t dt v in = .8v, i out = 200ma, v v en =.5v 5 s v in =3.6v, i out = 200ma, v v en =.5v .5 s rising time t rt v in = .8v, i out = 200ma, v v en =.5v 6.7 s falling time t ft v in = .8v, i out = 500ma, v v en =.5v 3.7 s sc705 turn-on delay time t dt v in = .8v, i out = 200ma, v v en =.5v 00 s v in =3.6v, i out = 200ma, v v en =.5v 50 s rising time t rt v in = .8v, i out = 200ma, v v en =.5v 37 s falling time t ft v in = .8v, i out = 500ma, v v en =.5v 7.2 s output pull-down resistance r pd v in =.8v 220 ? electrical characteristics (continued) notes: () i q current includes en pull-down current.
SC704/sc705 5 time (2ms/div) start up by vin start up by en start up by en 1.8vin, 0a typical characteristics (SC704) v out 1v/div. v in 1v/div. i out 0.2a/div. 3.6vin,0a time (5us/div) v in 1v/div. i in 0.2a/div. v out 1v/div. testing condition: vin=3.6v, iout=0.5a, c2=1uf, 25 w - ! cr mode, chroma 63030 t6(vout) t5(vin) iout start up by vin 3.6vin, 0.5a en 2v/div. time (5us/div) time (5ms/div) shutdown by vin v out 1v/div. v in 1v/div. i out 0.2a/div. 3.6vin, 0.5a testing condition: vin=3.6v , iout=0.5a, c2=1uf, cr mode, 25 w t6(vout) t5(vin) iout shutdown by vin start up by en (vin lead en) testing condition: vin=1.8v , 25 ( , iout=0.2a, c1=c2=1uf, cr mode testing condition: vin=3.6v , 25 ( , iout=0.2a, c1=c2=1uf, cr mode iin t6(vout) t5(vin) iin t6(vout) en t5(vin) en start up by en (vin lead en) testing condition: vin=1.8v , 25 ( , iout=0.2a, c1=c2=1uf, cr mode testing condition: vin=3.6v , 25 ( , iout=0.2a, c1=c2=1uf, cr mode iin t6(vout) t5(vin) iin t6(vout) en t5(vin) en v in 2v/div. i in 1a/div. v out 2v/div. en 2v/div. time (10us/div) v out 0.4v/div. i out 0.1a/div. shutdown by en v in 1v/div. 1.8vin, 9 ? en 1.5v/div.
SC704/sc705 6 start up by en start up by en 1.8vin, 0.2a typical characteristics (sc705) 3.6vin,0.2a time (10us/div) i out 0.1a/div. v out 0.4v/div. time (50us/div) v out 0.5v/div. i in 0.1a/div. i out 0.1a/div. shutdown by en v in 1v/div. en 1.5v/div. 1.8vin,9 ? en 2v/div. time (50us/div) testing condition: vin=3.6v , 25 ( , rl=18 ? , c1=c2=1uf testing condition: vin=1.8v , 25 ( , rl=9 ? , c1=c2=1uf t6(vout) iin iout en t6(vout) iin iout en start up by en (sc705) testing condition: vin=3.6v , 25 ( , rl=18 ? , c1=c2=1uf testing condition: vin=1.8v , 25 ( , rl=9 ? , c1=c2=1uf t6(vout) iin iout en t6(vout) iin iout en start up by en (sc705) v out 0.8v/div. i in 0.1a/div. i out 0.1a/div. en 2v/div. time (5ms/div) start up by vin v out 1v/div. v in 1v/div. i out 0.2a/div. shutdown by vin time (10ms/div) v in 1v/div. i out 0.2a/div. 3.6vin, 0.5a start up by vin testing condition: vin=3.6v , iout=0.5a, c2=1uf, cr mode, 25 : :: : t6(vout) t5(vin) iout 3.6vin, 0.5a shutdown by vin testing condition: vin=3.6v , iout=0.5a, c2=1uf, cr mode, 25 : :: : t6(vout) t5(vin) iout v out 1v/div. time (.2ms/div) i out 0.1a/div. v out 0.4v/div. shutdown by en v in 0.4v/div. en 1.5v/div. 1.8vin,0a
SC704/sc705 7 typical characteristics, cont. quiescent current (ua) on resistance (m) temperature ( c) on resistance vs. temperature quiescent current vs. temperature temperature ( c) en input pull-down resistance ( m ) en input pull-down resistance vs. temperature temperature ( c)
SC704/sc705 8 pin descriptions pin # pin name pin function a vin input supply voltage. b en enable input. drive high to turn on the switch; drive low to turn of the switch. floating is low. a 5m internal resis - tor is connected to gnd. in sc705 the en input engages the automatic discharge function when the input is at logic low. a2 out output voltage. b2 gnd ground. turn-on delay rise time turn-off delay 90% 10% v en v out fall time (turn on time)=(turn-on delay)+(rise time) timing diagram figure 1
SC704/sc705 9 block diagram vin(1.1~3.6v) vout en gnd c1 c2 slew rate control SC704 iload (up to 500ma) vin(1.1~3.6v) vout en gnd c1 c2 slew rate control sc705 iload (up to 500ma) SC704 sc705
SC704/sc705 0 application information operation the SC704/sc705 are integrated high-side pmos load switches that are designed to support up to 500ma con - tinuous output current and operate from an input voltage between . v to 3.6v. the internal pmos pass element has a very low on resistance of 90m (typical) at .8v. the enable pin incorporates a 5m (typical) pull-down resis - tor. the SC704/sc705 also provides ultra-low low shut - down and quiescent current for extended battery life during shutdown and light loading conditions. the sc705 includes an automatic output discharge func - tion which employs a 220 (typical) discharge path to ground when the en pin is disabled. the sc705 is also designed for longer output rise time to decrease input inrush current during power on. enable the gate of the internal pmos fet of SC704/sc705 is con - trolled by en pin logic circuitry. if the en pin is foating, the internal switch will be turned of. in sc705 the en pin also controls the automatic discharge function. input capacitor in order to improve voltage drop, noise and bounce on vin pin, a flter/decoupling capacitor between vin to gnd is recommended. a uf ceramic capacitor will be suf - cient for most application conditions. however it should be noted that suppressing bounce on input loop after en from high to low can require greater capacitor values depending on the particular design being implemented. during certain shutdown conditions, as in the case when input power supply is abruptly removed, the input voltage may tend to drop faster than the output voltage. in this event a reverse current through the body diode of inter - nal pmos fet from vout to vin can occur. to limit this reverse current, cin should be made greater than cout to sink current from the output. output capacitor a uf flter capacitor is added on the vout pin to sup - press noise on the evaluation board. if a larger output capacitance value is used, then input inrush current should be considered since the power-on transient is dependent on the output capacitor size. it should also be noted that sc705 has longer turn-on delay time and rise time than SC704 so sc705 will signifcantly improve input inrush current during power-on application conditions. board layout considerations input capacitor(c ) and output capacitor(c2) should be placed as close to the SC704/sc705 as possible, and all traces should be as short as possible and as wide as pos - sible to minimize the case-to-ambient thermal impedance and parasitic electrical efects. evaluation board information both t and t2 test points are kelvin connections which can be used to minimize r o. a jumper can be used between vin and en on j to enable the part. to disable the part the jumper can be connected between en and gnd on j .
SC704/sc705 top layer dbn461!w!21/6!;!npo!opw!15!21;3:;44!3124!.!)voujumfe* bottom layer dbn461!w!21/6!;!npo!opw!15!21;35;12!3124!.!)voujumfe* figure 2 figure 3
SC704/sc705 2 outline drawing csp 0.76mm x 0.76mm, 4 lead
SC704/sc705 3 land pattern csp 0.76mm x 0.76mm, 4 lead
semtech corporation power management products division 200 flynn road, camarillo, ca 930 2 phone: (805) 498-2 fax: (805) 498-3804 www.semtech.com contact information SC704/sc705 4 ? semtech 20 5 all rights reserved. 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. no liability will be accepted by the publisher for any conse - quence of its use. publication thereof does not convey nor imply any license under patent or other industrial or intellec - tual property rights. semtech assumes no responsibility or liability whatsoever for any failure or unexpected operation resulting from misuse, neglect improper installation, repair or improper handling or unusual physical or electrical stress including, but not limited to, exposure to parameters beyond the specifed maximum ratings or operation outside the specifed range. semtech products are not designed, intended, authorized or warranted to be suitable for use in life- support applications, devices or systems or other critical applications. inclusion of semtech products in such applications is understood to be undertaken solely at the customers own risk. should a customer purchase or use semtech products for any such unauthorized application, the customer shall indemnify and hold semtech and its ofcers, employees, subsidiaries, afliates, and distributors harmless against all claims, costs damages and attorney fees which could arise. notice: all referenced brands, product names, service names and trademarks are the property of their respective owners.

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