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power management sc33020h 2a load switch with reverse current blocking ? 20 5 semtech corporation features input voltage range C .6v to 5.5v 2a continuous output current ultra low ron C 32m? reverse current blocking low quiescent current C a low shutdown current C 0.3a internal soft start hardened esd protection 4kv package: csp C 0.9mm x 0.9mm 4-bump applications wearable electronics tablet pcs, ereaders smartphones notebook pcs, ultrabooks battery powered equipment other portable devices ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? description the sc33020h is an integrated 2a load switch with reverse current blocking. it operates from an .6v to 5.5v input supply. the sc33020h leaves the output node foat - ing when the part is disabled. the device provides extremely low 32mohm on resis - tance (r on ) in an ultra-small package. the reverse blocking feature prevents current from fowing in reverse direction from the output through the device to the input supply rail. whenever vout to vin voltage exceeds the reverse blocking threshold, reverse blocking is activated regard - less of the ic enable state either (on or off). the sc33020h is offered in a tiny 0.9mm x 0.9mm x 0.60mm, 4 bump csp package. the sc33020h has an operating temperature range of -40 c to +85 c . sc33020h supply load vout vin en gnd enable vin 1f 1f typical application circuit rev. 2.0
sc33020h 2 a1 a2 b1 b2 top view (bumps on the bottom) pin confguration marking information ordering information device package sc33020hcstrt csp 0.9mm x 0.9mm 4-bump SC33020HCSEVB evaluation board notes: () available in tape and reel only. a reel contains 5,000 devices. (2) lead-free package only. device is weee and rohs compliant, and halogen free. csp 0.9x0.9, 4 bump marking for the 0.9 x 0.9 mm csp 4 lead package : o = pin id nn = part no. code (example: h4) - reference part no. top view (bumps on the bottom)
sc33020h 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 js-00 -202. (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 jesd5 standards. absolute maximum ratings vin to gnd (v) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3 to +6.0 en to gnd (v) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3 to +6.0 vout to gnd (v). . . . . . . . . . . . . . . . . . . . . . . . -0.3 to (v vin + 0.3) esd protection level hbm () (kv) . . . . . . . . . . . . . . . . . . . . . . . 4 recommended operating conditions ambient temperature range (c) . . . . . . . . . . -40 < t a < +85 maxiumum output current (a) . . . . . . . . . . . . . . . . . . . . . . . . 2 v vin (v) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6 to 5.5 thermal information thermal resistance, junction to ambient (2) csp (c/w) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40 maximum junction temperature (c) . . . . . . . . . . . . . . + 25 storage temperature range (c) . . . . . . . . . . . . -65 to + 50 peak ir reflow temperature ( 0s to 30s) (c) . . . . . . . +260 unless noted otherwise, t a = 25c for typical, -40c < t a = t j < +85c for min and max, v in = 2.8v, c in = f, c out = f, v en = v vin . parameter symbol conditions min typ max units ron r on v in =5.5v, i out = 200ma, v en =.5v 25 m? v in =4.3v, i out = 200ma, v en =.5v 28 m? v in =3.3v, i out = 200ma, v en =.5v 32 43 m? v in =2.5v, i out = 200ma, v en =.5v 40 m? v in = .6v, i out = 200ma, v en =.5v 65 m? quiescent current () i q v in =v en ,=3.6v, v out = open 3 a shutdown current i sd v en =0, v out = open 0.3 2 a v en =0, v out = open, t a = 25c .24 a turn-on delay time (2) t dt v en = .5v, v in =3.6v, i out =200ma, c out =f 440 s rising time (2) t rt v en = .5v, v in =3.6v, i out =200ma, c out =f 640 s reverse blocking reverse blocking current (iout) r i v en =0v, v in =0v, v out =5.5v 3 3 a reverse blocking threshold r bt v out =2.8v, v out ? v in 75 mv reverse blocking hysteresis r bh v out =2.8v, v out ? v in 25 mv electrical characteristics
sc33020h 4 parameter symbol conditions min typ max units en digital input en input high threshold v en-ih .0 v en input low threshold v en-il 0.4 v en input pull-down resistance r en 7 m? notes: () i q current includes en pull-down current. (2) for other t dt and t rt options, please contact semtech. electrical characteristics (continued)
sc33020h 5 pin descriptions pin# pin name pin function a vin input supply voltage. b en enable input. a 7mf 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. a2 out output voltage. b2 gnd ground. 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
sc33020h 6 v out 1v/div. time (2ms/div) start up by vin start up by en start up by en 3.6vin, 18 ? typical characteristics i out 1a/div. v in 1v/div. v out 1v/div. 5.5vin, 2.75 ? time (0.2ms/div) v in 1v/div. en 3.6v/div. v out 1v/div. t1(vin) iout testing condition: vin=5.5v, iout=2a (pure resistor), c2=1uf, 25 w 5.5vin, 2a i out 0.2a/div. time (0.2ms/div) time (2ms/div) shut down by vin i out 1a/div. v in 1v/div. 5.5vin, 2a testing condition: vin=5.5v , iout=2a, c2=1uf, pure resistor, 25 w t2(vout) t1(vin) iout testing condition: vin=5.5v , 25 ( , iout=2a, c1=c2=1uf, pure resistor, t2(vout) t1(vin) en iout v in 1v/div. i in 1a/div. v out 1v/div. en 1.5v/div. time (20 s/div) v out 1v/div. en 3.6/div. shut down by en v in 1v/div. 3.6vin, 18 ? i out 0.2a/div. reverse blocking 1.6vin to 1.5vin, 1.6vout, 0a time (1ms/div) v in 0.3v/div. i in 0.5a/div. v out 0.3v/div.
sc33020h 7 typical characteristics, 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 * 3.3v 4.3v 1.6v 2.5v 5.5v on resistance (m) temperature ( c) on resistance vs. temperature quiescent current vs. temperature 1 / 1 1 / 3 1 / 5 1 / 7 1 / 9 2 / 1 2 / 3 2 / 5 . 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 * 5.5v 3.3v 1.6v 2.8v temperature ( c) on resistance (m) on resistance vs. temperature 5 1 7 1 9 1 2 1 1 2 3 1 2 5 1 2 7 1 2 9 1 3 1 1 . 5 1 3 6 9 6 s p o ) n * u f n q f s b u v s f ) w * 3.3v 4.3v 1.6v 2.5v 5.5v temperature ( c) shutdown current ( a) shut down current vs. temperature 1 / 1 1 / 2 1 / 3 1 / 4 1 / 5 1 / 6 1 / 7 . 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 * 3.3v 5.5v 1.6v 2.8v temperature ( c) en high threshold (mv) en high threshold vs. temperature 6 6 1 7 1 1 7 6 1 8 1 1 8 6 1 9 1 1 9 6 1 : 1 1 . 5 1 3 6 9 6 f o ) n w * u f n q f s b u v s f ) w * 2.8v 3.6v 1.6v 5.5v temperature ( c) en input pull-down resistance ( m ) en pull-down resistance vs. temperature 7 / 1 7 / 3 7 / 5 7 / 7 7 / 9 8 / 1 8 / 3 8 / 5 8 / 7 8 / 9 9 / 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 * temperature ( c) i out = 200ma i out = 2a 2.8vin
sc33020h 8 typical characteristics, cont. turn-of time ( s) 1 6 1 1 2 1 1 1 2 6 1 1 3 1 1 1 3 6 1 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 5.5v 1.6v turn-on delay time ( s) temperature ( c) turn-on delay time vs. temperature turn-of time vs. temperature 3.6v 1 6 2 1 2 6 3 1 3 6 4 1 4 6 . 5 1 3 6 9 6 u v s o . p g g ! 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 5.5v 1.6v temperature ( c) turn-on rising time ( s) rising time vs. temperature 1 3 1 1 5 1 1 7 1 1 9 1 1 2 1 1 1 2 3 1 1 2 5 1 1 2 7 1 1 . 5 1 3 6 9 6 u v s o . p g g ! 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 1.6v 5.5v temperature ( c) reverse blocking current ( a) reverse blocking current vs. temperature 1 2 3 4 5 6 7 . 5 1 3 6 9 6 s f w f s t f ! c m p d l j o h ! d v s s f o u ) v b * u f n q f s b u v s f ) w * temperature ( c) reverse blocking (mv) reverse blocking threshold and hysteresis vs. temperture 3 1 4 1 5 1 6 1 7 1 8 1 9 1 : 1 . 5 1 3 6 9 6 n w u f n q f s b u v s f ) w * hysteresis threshold temperature ( c) en = low
sc33020h 9 block diagram vin (1.6v to 5.5v) vout en gnd c1 c2 slew rate control sc33020h iload (up to 2a) reverse blocking
sc33020h 0 input capacitor in order to reduce the efect of voltage drop, noise and bounce at the vin pin, a filter/decoupling capacitor between vin to gnd is recommended. a f 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. in circuit design, ceramic capacitors should be derated for operating temperature and voltage. for applications up to 3.6v, capacitors should be rated at 6.3v or higher. for appli - cations up to 5.5v, capacitors should be rated at 0v or higher. output capacitor a f ceramic capacitor is normally used at the vout pin to filter noise. 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. please use the same derating criteria for the output capacitor selection. board layout considerations fig. 2 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. pcb induc - tance can afect circuit performance during turn-of, load transients, and reverse blocking. fig. 2 shows three current loops during the opening or closing of the load switch. the magnitude of the voltage ringing at vin or vout pin application information operation the sc33020h is an integrated high-side pmos load switch that is designed to support up to 2a continuous output current and operates from an input voltage from .6v to 5.5v. the internal pmos pass element has a very low on resistance of 32mf (typical) at v in = 3.3v. the sc33020h also provides ultra-low shutdown and quies - cent current for extended battery life during shutdown and standby conditions. an internal soft start circuit is used to control the start-up time of the load switch to reduce inrush current during start up. enable the en pin controls the on/off state 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 7mf (typical) pull-down resistor, so that when the en pin is foating the sc33020h is disabled. reverse blocking the sc33020h integrates a reverse current blocking circuit to prevent current fow from vout to vin during both on and off states. the reverse current blocking circuit is active when voltage is present on either the vin or the vout. a comparator is used to sense and compare the vout voltage to the vin voltage. whenever the vout voltage is 75mv (typical at 25 c ) higher than vin, the reverse blocking circuit is triggered and reverse current is blocked from vout to vin. please note that when 0 < vout - vin < 75mv (typical at 25 c ), some small reverse current is possible. an example is shown in fig. . usually, worst case for reverse current occurs at elevated input voltages and reduced temperatures. the following formula can be used to calculate the reverse peak current before the reverse blocking circuit is triggered . i rc - reverse peak current. r on - on-resistance, (usually, is smaller resistance at higher v in and lower temperature.) v rbt - reverse voltage threshold. i rc r on = v rbt v rbt i rc v in v out reverse current i rc is the amount of reverse current, r on is the on-resistance, on there is smaller resistance at larger v in and lower ambient temperature v bt is the reverse voltage threshold. figure 1
sc33020h is related to the pcb stray inductance and the placement of the capacitors. the input capacitor c and output capacitor c2 need to be placed close to the sc33020h. it is important to keep the voltage ringing below the maximum voltage rating of the sc33020h. evaluation board information the top layer and bottom layer of a standard evaluation board are shown in fig. 3 and fig. 4, respectively. both t 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 j . to disable the part, a jumper can be con - nected between en and gnd on j . c3 is an optional solution to improve ringing at input rail during turn-of and reverse blocking conditions. c1 c2 sc33020h l pcb vin vout l pcb gnd l pcb l pcb i sw 1uf i out r l 1uf l pcb i in + - figure 2 - pcb circuit with equivalent parasitic inductance application information, cont.
sc33020h 2 top layer, sc33020h dbn461!w!21/6!;!uiv!bvh!39!27;3:;2:!3125!.!)voujumfe* bottom layer, sc33020h dbn461!w!21/6!;!uiv!bvh!39!27;41;22!3125!.!)voujumfe* figure 3 figure 4
sc33020h 3 outline drawing csp 0.9mm x 0.9mm, 4 lead
sc33020h 4 land pattern csp 0.9mm x 0.9mm, 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 ? 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. sc33020h 5

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