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? 2015 semtech corporation power management 1 sc728/sc729 2a low vin, very low ron load switch features input voltage range C 1.1v to 3.6v 2a continuous output current ultra-low ron C 36m automatic output discharge circuit fast turn-on option with no output discharge circuit C sc728 extended soft start option with automatic out - put discharge circuit C sc729 low quiescent current C 0.81a(typ.) low shutdown current < 1a C sc728 1.1v logic level enable compatible with cmos/gpio control hardened esd protection 3kv 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 sc728/sc729 is a low input voltage, very low ron load switch designed for use in battery powered applica - tions. very low quiescent current of less than 2 a, and a low shutdown current of less than 1 a (sc728) reduces power loss during standby and of states. a logic level enable allows low voltage on/of control down to 1.1v. the sc728 provides a quick turn on time, while the sc729 provides a longer soft start to limit inrush current. the sc729 also features an automatic discharge circuit which discharges the output when the part is disabled. the sc728/sc729 is offered in an ultra-small 4-bump 0.76mm 0.76mm chip scale package (csp) which enables very small board area implementations. the sc728/sc729 has an operating ambient temperature range of -40 c to +85 c . sc724/sc725 offers an alternative bump connection pattern to sc728/sc729. please go to semtech.com website for details. sc728 / sc729 supply load vout vin en gnd enable vin 1f 1f typical application circuit rev. 2.2 device package automatic discharge rising time sc728 csp no 3s(typ.) sc729 csp yes 140s(typ.)
sc728/sc729 2 pin confguration ordering information device package sc728cstrt csp 0.76mm0.76mm 4-bump SC729CSTRT csp 0.76mm0.76mm 4-bump sc728evb evaluation board sc729evb evaluation board notes: (1) 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 pin descriptions pin # pin name pin function a2 vin input voltage. b2 en enable input. a 5.5m? internal resistor is connected from this pin to gnd. drive high to turn on the switch; drive low to turn of the switch. when the en pin is foated, the switch is off. a1 vout output voltage. b1 gnd ground.
sc728/sc729 3 marking information(sc728) marking information(sc729) marking for the 0.76 x 0.76 mm csp 4 lead package : o = pin 1 id nn = part no. code (example: av) - reference part no. marking for the 0.76 x 0.76 mm csp 4 lead package : o = pin 1 id nn = part no. code (example: ay) - reference part no.
sc728/sc729 4 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: (1) tested according to jedec standard js-001-2012. (2) calculated from package in still air, mounted to 3 x 4.5 (in), 4 layer fr4 pcb with thermal vias under the exposed pad per jesd51 standards. absolute maximum ratings vin to gnd (v) . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3 to +4.3 en to gnd (v) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3 to +4.3 out to gnd (v) . . . . . . . . . . . . . . . . . . . . . . . . . .-0.3 to +v vin esd protection level (1) (kv) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 recommended operating conditions ambient temperature range (c) . . . . . . . . . -40 < t a < +85 v vin (v) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.1 to 3.6 maximum output current (a) . . . . . . . . . . . . . . . . . . . . . . . . 2 thermal information thermal resistance, junction to ambient (2) (c/w) . . . 160 maximum junction temperature (c) . . . . . . . . . . . . . . +125 storage temperature range (c) . . . . . . . . . . . . -65 to +150 peak ir reflow temperature (10s to 30s) (c) . . . . . . . +260 unless noted otherwise, t a = 25c for typical, -40c < t a = t j < 85c for min and max. v vin = 1.8v, c in = 1f, c out = 1f, v en = v vin . parameter symbol conditions min typ max units on resistance (ron) r on v vin =3.6v, i out = 200ma, v v en =1.5v 24 m? v vin =2.5v, i out = 200ma, v v en =1.5v 29 m? v vin =1.8v, i out = 200ma, v v en =1.5v 36 47 m? v vin =1.5v, i out = 200ma, v v en =1.5v 43 m? v vin =1.2v, i out = 200ma, v v en =1.0v 57 m? quiescent current (1) i q v vin = v en = 3.6v, v out = open 0.81 2 a enable en input high threshold v en-ih 1.1 v en input low threshold v en-il 0.3 v en input pull-down resistance r en 5.5 m? sc728 shutdown current i sd v en =0v, v out = open 1 a v en =0v, v out = open, t a = 25c c 0.2 a electrical characteristics
sc728/sc729 5 parameter symbol conditions min typ max units turn-on delay time t dt v vin =1.8v, i out = 200ma, v v en =1.5v, c out =1f 11 s v vin =3.6v, i out = 200ma, v v en =1.5v, c out =1f 2.8 s rising time t rt v vin =1.8v, i out = 200ma, v v en =1.5v, c out =1f 8.5 s v vin =3.6v, i out = 200ma, v v en =1.5v, c out =1f 3 s sc729 shutdown current i sd v en =0v, v out = open 8 a v en =0v, v out = open, t a = 25c c 0.6 a turn-on delay time t dt v vin =1.8v, i out = 200ma, v v en =1.5v, c out =1f 240 s v vin =3.6v, i out = 200ma, v v en =1.5v, c out =1f 110 s rising time t rt v vin =1.8v, i out = 200ma, v v en =1.5v, c out =1f 250 s v vin =3.6v, i out = 200ma, v v en =1.5v, c out =1f 140 s output pull-down resistance r pd v vin =1.8v 250 ? electrical characteristics (continued) notes: (1) i q current includes en pull-down current. turn-on delay rising time turn-off delay 90% 10% v en v out falling time (turn on time)=(turn-on delay)+(rising time) timing diagram
sc728/sc729 6 time (5ms/div) start up by vin start up by en start up by en 1.8vin, 0a typical characteristics (sc728) v out 1v/div. v in 1v/div. i out 1a/div. 3.6vin,0a time (10 s /div) testing condition: vin=3.6v, iout=0.5a, c2=1uf, 25 ( , vout vin iin start up by vin iout 3.6vin, 1.8 ? en 2v/div. time (10 s /div) time (5ms/div) shut down by vin 3.6vin, 1.8 ? start up by en testing condition: vin=1.8v , 25 ( , iout=2a, c1=c2=1uf, cr mode testing condition: vin=3.6v , 25 ( , iout=2a, c1=c2=1uf, cr mode testing condition: vin=1.8v , 25 ( , iout=2a, c1=c2=1uf, cr mode testing condition: vin=3.6v , 25 ( , iout=2a, c1=c2=1uf, cr mode vout vin en iin vout vin en iin vout vin en iin vout vin en iin start up by en testing condition: vin=1.8v , 25 ( , iout=2a, c1=c2=1uf, cr mode testing condition: vin=3.6v , 25 ( , iout=2a, c1=c2=1uf, cr mode testing condition: vin=1.8v , 25 ( , iout=2a, c1=c2=1uf, cr mode testing condition: vin=3.6v , 25 ( , iout=2a, c1=c2=1uf, cr mode vout vin en iin vout vin en iin vout vin en iin vout vin en iin v in 1v/div. i in 1a/div. v out 1v/div. en 2v/div. time (20 s /div) shut down by en 3.6vin, 18 ? i in 1a/div. testing condition: vin=3.6v , iout=0.5a, c2=1uf, cr mode, 25 w t6(vout) t5(vin) iout shutdown by vin vout vin iin iout v out 1v/div. v in 1v/div. i out 1a/div. i in 1a/div. v out 0.5v/div. v in 0.5v/div. i in 1a/div. en 2v/div. v out 1v/div. v in 1v/div. i out 0.2a/div.
sc728/sc729 7 typical characteristics (sc728), cont. quiescent current ( a) 2 1 3 1 4 1 5 1 6 1 7 1 8 1 9 1 . 5 1 3 6 9 6 s p o ) n * u f n q f s b u v s f ) w * 1 .8v 2.5v 3.6v 1.5v 1.2v ron@200ma on resistance (m) temperature ( c) on resistance vs. temperature quiescent current vs. temperature iout=200ma ron@2a 2 1 3 1 4 1 5 1 6 1 7 1 8 1 9 1 . 5 1 3 6 9 6 s p o ) n * u f n q f s b u v s f ) w * 1 .8 v 3.6v 1.2v on resistance (m) temperature ( c) on resistance vs. temperature iout=2a quiescent current 1 / 1 1 / 2 1 / 3 1 / 4 1 / 5 1 / 6 1 / 7 1 / 8 1 / 9 1 / : 2 / 1 . 5 1 3 6 9 6 r v j f t d f o u ! d v s s f o u ) v b * u f n q f s b u v s f ) w * 3.6v 1.8v 1.1v temperature ( c) turn-on delay time ( s ) turn-on delay time vs. temperature turn-on delay time 1 2 1 3 1 4 1 5 1 6 1 7 1 . 5 1 3 6 9 6 u v s o . p o ! e f m b z ! u j n f ) v t * u f n q f s b u v s f ) w * 3.6v 1.8v 1.1v temperature ( c) shut down current ( a) shut down current vs. temperature shutdown current 1 / 1 1 1 / 1 5 1 / 1 9 1 / 2 3 1 / 2 7 1 / 3 1 1 / 3 5 1 / 3 9 1 / 4 3 . 5 1 3 6 9 6 t i v u e p x o ! d v s s f o u ) v b * u f n q f s b u v s f ) w * 3.6v 1.8v 1.1v temperature ( c) en input-down resistance ( m? ) en input pull-down resistance vs. temperature 5 / 9 6 / 1 6 / 3 6 / 5 6 / 7 6 / 9 7 / 1 7 / 3 7 / 5 7 / 7 . 5 1 3 6 9 6 f o ! q v m m e p x o ! s f t j t u b o d f ) n * u f n q f s b u v s f ) w * en_r@1.8vin temperature ( c) vin=1.8v
sc728/sc729 8 time (5ms/div) start up by vin start up by en start up by en 1.8vin, 0.9 ? typical characteristics (sc729) v out 1v/div. v in 1v/div. i out 1a/div. 3.6vin, 1.8 ? time (0.2ms/div) 3.6vin, 1.8 ? en 2v/div. time (0.1ms/div) time (5ms/div) shut down by vin 3.6vin, 1.8 ? v in 1v/div. i out 1a/div. v out 1v/div. en 2v/div. time (5 s /div) shut down by en 3.6vin, 18 ? v out 1v/div. v in 1v/div. v out 0.5v/div. v in 0.5v/div. i out 1a/div. i out 0.2a/div. v out 1v/div. v in 1v/div. en 2v/div. i in 1a/div. i out 1a/div. i in 1a/div. 6 1 1 6 6 1 7 1 1 7 6 1 8 1 1 8 6 1 9 1 1 9 6 1 : 1 1 : 6 1 2 1 1 1 . 5 1 3 6 9 6 s p o ) n * u f n q f s b u v s f ) w * 3.6v 1.8v 1.1v en high threshold (mv) temperature ( c) en high threshold vs. temperature
sc728/sc729 9 typical characteristics (sc729), cont. turn on delay ( s ) 1 / 1 1 / 6 2 / 1 2 / 6 3 / 1 3 / 6 . 5 1 3 6 9 6 t i v u e p x o ! d v s s f o u ) v b * u f n q f s b u v s f ) w * 3.6v 1.8v 1.1v shut down current ( a) temperature ( c) shut down current vs. temperature turn-on delay vs. temperature turn of delay ( s ) turn-of delay vs. temperature 1 6 1 2 1 1 2 6 1 3 1 1 3 6 1 4 1 1 4 6 1 . 5 1 3 6 9 6 f o ! q v m m e p x o ! s f t j t u b o d f ) n * u f n q f s b u v s f ) w * 1 .8 v 3.6v temperature ( c) 1 3 5 7 9 2 1 2 3 2 5 2 7 2 9 . 5 1 3 6 9 6 f o ! q v m m e p x o ! s f t j t u b o d f ) n * u f n q f s b u v s f ) w * 1 .8v 3.6v temperature ( c) rising time ( s ) rising time vs. temperature falling time ( s ) falling time vs. temperature 1 6 1 2 1 1 2 6 1 3 1 1 3 6 1 4 1 1 4 6 1 . 5 1 3 6 9 6 f o ! q v m m e p x o ! s f t j t u b o d f ) n * u f n q f s b u v s f ) w * 1.8v 3.6v temperature ( c) 1 2 3 4 5 6 7 8 9 . 5 1 3 6 9 6 f o ! q v m m e p x o ! s f t j t u b o d f ) n * u f n q f s b u v s f ) w * 1.8v 3.6v temperature ( c) output pull-down resistance vs. temperature 3 4 1 3 5 1 3 6 1 3 7 1 3 8 1 3 9 1 3 : 1 . 5 1 3 6 9 6 s p o ) n * u f n q f s b u v s f ) w * temperature ( c) vin=1.8v output pull-down resistance ( ? )
sc728/sc729 10 block diagram vin (1.1v to 3.6v) vout en gnd c1 c2 sc728 iload (up to 2a) slew rate control vin (1.1v to 3.6v) vout en gnd c1 c2 slew rate control sc729 iload (up to 2a) sc728 sc729
sc728/sc729 11 output capacitor a 1f ceramic capacitor is normally used at the vout pin to suppress output noise and provide smooth voltage to the load. if a larger output capacitance value is used, the input inrush current should be considered because the power-on transient is also dependent on the output capacitor value. note that sc729 has longer turn-on delay time and rising time than sc728. if a larger output capacitor is used, sc729 could signifcantly improve input inrush current during power-on process. board layout considerations fig. 1 shows a typical application circuit with pcb induc - tance on the circuit board. an important objective of the layout is to minimize the pcb inductance by reducing the length and increasing the width of the traces. the input capacitor c1 and output capacitor c2 need to be placed close to the sc728/sc729. to analyze the stray inductance, fig. 1 shows three current loops during the opening or closing of the load switch. the magnitude of the voltage ringing at vin or vout pin is related to the pcb stray inductance and the placement of the capacitors. it is important to keep the voltage ringing below the maximum voltage rating of the sc728/sc729. application information operation the sc728/sc729 is an integrated high-side pmos load switch that is designed to support up to 2a continuous output current and operate from an input voltage from 1.1v to 3.6v. the internal pmos pass element has a very low on resistance of 36m (typical) at v in = 1.8v. the sc728/sc729 also provides ultra-low shutdown and qui - escent current for extended battery life during applica - tion of and standby states. sc729 provides longer turn-on delay time and rising time, which can help reduce inrush current and voltage drop on the input supply rail during power on. sc728 provides shorter turn-on delay and rising time for applications where immediate response is required. output voltage pull-down the sc729 also includes an automatic output discharge function. it employs a 250 (typical) discharge path to ground when the en pin is disabled. enable the en pin controls the on/off states of the load switch. pulling the en pin high turns on the load switch. pulling the en pin low turns off the load switch. the en pin incorporates a 5.5m (typical) pull-down resistor, so that when the en pin is foating the sc728/sc279 is disabled. input capacitor in order to reduce the efects of voltage drop, noise, and bounce at the vin pin, a filter/decoupling capacitor between vin to gnd is recommended. a 1f ceramic capacitor is sufficient for most application conditions. however, it should be noted that suppressing bounce at input loop after en is changed from high to low can require greater capacitor values depending on particular designs. 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 internal pmos fet, from vout to vin can occur. to limit this reverse current, the cin value should be selected greater than the cout value. c1 c2 l pcb vin vout l pcb gnd l pcb l pcb i sw 1uf i out r l 1uf l pcb i in + - sc728/sc729 figure 1 - pcb circuit with equivalent parasitic inductance evaluation board information the top layer and bottom layer of a standard evaluation board are shown in fig. 2 and fig. 3, respectively. both t1 and t2 test points are kelvin connections which can be used to minimize the measurement error of r on . to enable the part, a jumper can be used between vin and en on j1. to disable the part, a jumper can be con - nected between en and gnd on j1.
sc728/sc729 12 top layer dbn461!w!21/6!;!gsj!tfq!16!27;1:;35!3125!.!)voujumfe* bottom layer dbn461!w!21/6!;!gsj!tfq!16!26;6:;68!3125!.!)voujumfe* figure 2 figure 3
sc728/sc729 13 outline drawing csp 0.76mm x 0.76mm, 4 lead
sc728/sc729 14 land pattern csp 0.76mm x 0.76mm, 4 lead
semtech corporation power management products division 200 flynn road, camarillo, ca 93012 phone: (805) 498-2111 fax: (805) 498-3804 www.semtech.com contact information sc728/sc729 15 ? semtech 2015 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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