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rev. 1.0 october 2018 www.aosmd.com page 1 of 16 aoz1356li 5v/3a ecpower? protection switch supporting usb pd fast role swap general description the aoz1356li is a current-limiting protection switch targeting applications that require comprehensive pro- tections. for aoz1356li-01 and -02 the input operat- ing voltage range is 3.4v to 5.5v, and for aoz1356li- 05 and -06, the input operating voltage range is between 3.6v and 5.3v. the output terminal is rated 28v absolute maximum. the internal curr ent-limiting circuit protects the supply from large load current. the current limit level is set wit h an external resistor. the internal soft-start circuit controls inrush current due to highly capacitive loads. th e device features very low quiescent current. the supply current reduces to 6a in shut-down. it also has under-voltage lockout (uvlo), over-voltage protection (ovp) and thermal shutdown protection. the aoz1356li has true reverse-current blocking (trcb) protection to avoid undesired reverse-current from vout to vin. the aoz1356li supports usb pd fast role swap. when fon pin is high, the device is in fast turn-on mode to ensure output voltage rises quickly to meet usb pd spec. the device also features fast recovery to turn on power switch once reverse current blocking protection is de-activated. the aoz1356li is available in 1.31mm x 1.81mm wlcp package with 0.4mm pitch and 12-bumps. features ? 28v voltage rating on vout pin ? up to 3.5a current capability ? typical r on : 34m ? ? supports usb pd fast role swap (frs) ? programmable current limit ? true reverse-current blocking (trcb) ? fast recovery from trcb ? 125a quiescent current ? over-voltage protection ? short-circuit protection ? input under-voltage lockout ? thermal shutdown protection ? 4kv hbm rating ? 1kv cdm rating ? iec61000-4-5: 45v (no cap) ? wlcsp-12 1.31mm x 1.81mm 0.4 pitch ? ul pending applications ? usb pd power source switch ? smartphones and tablets ? notebooks, ultra books and desktops ? portable devices typical application vin c out aoz1356li vout fltb en c in r fltb gnd r lim ilim fon 5v downloaded from: http:///
aoz1356li rev. 1.0 october 2018 www.aosmd.com page 2 of 16 ordering information all aos products are offered in packages with pb-free plating and compliant to rohs standards. please visit www.aosmd.com/media/aosgreenpolicy.pdf for additional information. pin configuration pin description part number fault recovery operating voltage range package environmental aoz1356li-01 auto-restart 3.4v-5.5v wlcsp, 12-bumps rohs aoz1356li-02 latch-off 3.4v-5.5v wlcsp, 12-bumps rohs aoz1356li-05 auto-restart 3.6v-5.3v wlcsp, 12-bumps rohs AOZ1356LI-06 latch-off 3.6v-5.3v wlcsp, 12-bumps rohs pin number pin name pin function 1a, 1b, 1c vin supply input. connected to internal powe r regulator. they are inte rnally connected together. 1d fltb fault indicator, open-drain output, active-low when fault condition occurs. 2a, 2b, 2c gnd ground. 2d ilim current limit set pin. connect a 1% resistor r lim from ilim to gnd to set the current limit threshold. 3a, 3b vout power output. connect to adapter. they are internally connected together. 3c fon fast-on. active high. this pin set device into fast turn-on mode. internally pulled down with a resistor. 3d en enable input. active high. internally pulled down with a resistor. ab c d vin vin vin gnd gnd gnd vout fltb en fon vout ilim wlcp-12 1.31mm x 1.81mm 0.4 pitch (top transparent view) 1 2 3 downloaded from: http:///
aoz1356li rev. 1.0 october 2018 www.aosmd.com page 3 of 16 absolute maximum ratings exceeding the absolute maximum ratings may damage the device. recommended operating ratings the device is not guaranteed to operate beyond the maximum operating ratings . parameter rating vout to gnd -0.3v to +28v vin, en, ilim, fon, fltb to gnd 0v to +6v junction temperature (t j ) +150c storage temperature (t s ) -65c to +150c esd rating hbm/cdm 4kv / 1kv parameter rating vin to gnd 3.4v to 5.5v fon, en, fltb to gnd 0v to 5.5v switch current (i sw ) 0a to 3.5a ilim 0v to 2v ambient temperature (t a ) -40c to +85c package thermal resistance 84c/w electrical characteristicst a = 25c, v in = 5v, v en = 5 v, v fon = 0v unless otherwise specified. symbol parameter conditions min. typ. max. units general v in input supply voltage aoz1356li-01 and -02 3.4 5.5 v aoz1356li-05 and -06 3.6 5.3 v v uvlo_r under-voltage lockout threshold vin rising aoz1356li-01 and -02 3 3.25 3.35 v vin rising aoz1356li-05 and -06 3.2 3.45 3.55 v v uvlo_hys under-voltage lockout hysteresis vin falling 150 mv i in_on input quiescent current i out = 0a, fon = 0v, ven= 5v 125 a i in_fon fon standby current fon = 5v, ven = 0v 135 ma i in_off input shutdown current en = 0v, fon = 0v 6 10 a r on switch on resistance i out = 1a 34 m ? v en_h enable input logic high threshold en rising 1.4 v v en_l enable input logic low threshold en falling 0.4 v i en_bias enable input bias current en = 1.8v 1 1.5 a v fon_h fast-on logic high threshold fon rising 1.4 v v fon_l fast-on logic low threshold fon falling 0.4 v i fon_bias fast-on input bias current vfon = 1.8v 1.5 4.0 a v fltb_lo fltb pull-down voltage i sink = 3ma 0.3 v over-voltage protection v ovlo_r over-voltage lockout threshold vin rising aoz1356li-01 and -02 5.6 5.8 6 v v ovlo_f vin rising aoz1356li-05 and -06 5.75 5.9 v ovlo_hys over-voltage lockout hysteresis 250 mv v out_ovlo output over-voltage lockout threshold aoz1356li-05 and -06 5.3 5.5 v t delay_ovp ovp turn-off delay 2 s downloaded from: http:///
aoz1356li rev. 1.0 october 2018 www.aosmd.com page 4 of 16 note: 1. guaranteed by design. not production tested. 1% resistors. over-current protection i lim current limit threshold vout = 5v, r lim = 4.02k ? (1) 3.08 3.5 3.92 a vout = 5v, r lim = 14.3k ? 0 . 911 . 1 vout = 5v, r lim = 29.4k ? 0.45 0.5 0.55 t ocp_fltb over-current flag delay from i out i lim to fltb pulled low 12 ms reverse-current blocking v t_rcb rcb protection trip point vout-vin, vout rising 25 mv v r_rcb rcb protection release trip point vin-vout, vout falling 40 mv v rcb_hys rcb hysteresis v t_rcb + v r_rcb 65 mv t rcb rcb response time 600 ns t rcb_re- covery rcb fast recovery cout = 1f, rl= 100 ? 80 s thermal shutdown t sd thermal shutdown threshold temperature rising 140 c t sd_hys thermal shutdown hysteresis temperature falling 20 dynamic characteristics t d_on turn-on delay time (from ven 50% to vout=0.5v) vin = 5v, r l = 100 ? , c out = 1f, r lim = 14.3k ? 2.5 ms t on turn-on time (vout from 0.5v to 4.5v) vin = 5v, r l = 100 ? , c out = 1f, r lim = 14.3k ? 2m s t fon fast turn-on time (from ven=v en_h to vout=4.75v) vin = 5v, ven = 5v, vfon = 5v, r l = 100 ? , c out = 1f, r lim = 14.3k ? 50 100 s t s_fon fon setup time prior to en 100 s t h_fon fon hold time after en 40 s electrical characteristicst a = 25c, v in = 5v, v en = 5 v, v fon = 0v unless otherwise specified. symbol parameter conditions min. typ. max. units downloaded from: http:///
aoz1356li rev. 1.0 october 2018 www.aosmd.com page 5 of 16 functional block diagram control logic gate drive & charge pump uvlo ovlo trcb current limit vin vout ilim fltb gnd vin vout en fon downloaded from: http:///
aoz1356li rev. 1.0 october 2018 www.aosmd.com page 6 of 16 timing diagrams figure 1. normal turn-on del ay and turn-on time (vfon=0v) figure 2. fast turn-on time (vin=5v) figure 3. fast recovery from rcb en vout t d_on t on fon en vout fon v fon_h t s_fon v en_h 4.75v t fon vout vin=5v v r_rcb t rcb_recovery 4.75v downloaded from: http:///
aoz1356li rev. 1.0 october 2018 www.aosmd.com page 7 of 16 typical characteristicst a =25c, v in =5v, fon floating, device option auto-restart, c in =76 f (nominal) , c out =9.4 f (nominal), r lim =4.75k ? , un less otherwise noted. "offset" or "ofst" in the scope shots below means vertical position of the channel's ground reference relative to the mi d horizontal line. figure 1. soft start (load = 1.9 ? ) figure 2. shutdown by en ( load = 1.9 ? ) figure 3. soft start by toggling vin ( load = 1.9 ? ) figure 4. shutdown by toggling vin ( load = 1.9 ? ) figure 5. over current protection ( load = 1.2 ? plugged in) figure 6. short circuit protection, thermal shutdown and auto restart vin vout i_in en 1ms/div vin vout i_out en 20s/div vin vout i_out en 1ms/div vin vout i_out en 1ms/div vin vout i_out fltb 2ms/div vin vout i_in fltb 50ms/div downloaded from: http:///
rev. 1.0 october 2018 www.aosmd.com page 8 of 16 aoz1356li typical characteristics (continued) t a =25c, v in =5v, fon floating, device option auto-restart, c in =76 f (nominal), c out =9.4 f (nominal), r lim =4.75k ? , unless otherwise noted. "offset" or "ofst" in the scope shots below means vertical position of the channel's ground reference relative to the mid horiz ontal line. figure 7. fast role swap figure 8. fast start up (fon=5v, no load) figure 9. starting up into shorted output figure 10. reverse current blocking (vout shorted to 20v) figure 11. recovery from reverse current blocking figure 12. over current protection (latch-off) vin vout i_in en 100s/div vin vout i_in en 20s/div vin vout i_in en 50ms/div vin vout i_in fltb 5s/div vin vout i_out 100s/div vin vout i_out fltb 50ms/div downloaded from: http:///
rev. 1.0 october 2018 www.aosmd.com page 9 of 16 aoz1356li typical characteristics (continued) t a =25c, v in =5v, fon floating, device option auto-restart, c in =76 f (nominal), c out =9.4 f (nominal), r lim =4.75k ? , unless otherwise noted. "offset" or "ofst" in the scope shots below means vertical position of the channel's ground reference relative to the mid horiz ontal line. figure 13. short duration over current (r lim =14.3k) (latch-off) figure 14. short circuit protection (latch-off) vin vout i_in fltb 50ms/div vin vout i_in fltb 50ms/div downloaded from: http:///
aoz1356li rev. 1.0 october 2018 www.aosmd.com page 10 of 16 typical characteristicst a = 25c, v in = 5v unless otherwise specified . figure 15. r dson vs. temperature figure 16. rdson vs. input voltage figure 17. en threshold vs. temperature figure 18. en bias current vs. temperature figure 19. fon threshold vs. temperature figure 20. uvlo threshold vs. temperature (aoz1356li-01, -02) r dson (m ? ) temperature ( ? c) 5045 40 35 30 25 20 -40 -20 25 55 85 load=1a rdson (m ? voltage (v) 5045 40 35 30 25 20 3.0 3.5 4.0 5.0 5.5 6.0 4.5 enable threshold voltage (v) temperature (c) 1.21.0 0.8 0.6 0.4 0.2 0.0 rising falling -40 -20 25 55 85 enable bias current (a) temperature (c) 1.5 1.4 1.3 1.2 1.1 1.0 0.9 0.8 0.7 0.6 -40 -20 25 55 85 enable threshold voltage (v) temperature (c) 1.21.0 0.8 0.6 0.4 0.2 0.0 rising falling -40 -20 25 55 85 uvlo threshold voltage (v) temperature (c) 3 . 3 3.25 3.2 3.15 3.1 3.05 3 2.95 2.9 rising falling -40 -20 25 55 85 downloaded from: http:///
aoz1356li rev. 1.0 october 2018 www.aosmd.com page 11 of 16 typical characteristics (continued) t a = 25c, v in = 5v unless otherwise specified . figure 21. ovp threshold vs. temperature (aoz1356li-01, -02) figure 22. current limit threshold vs. temperature figure 23. current limit vs. r lim figure 24. turn-on time (ton) vs. temperature figure 23. current limit vs. r lim ovp threshold voltage (v) temperature (c) 5.9 5.85 5.8 5.75 5.7 5.65 5.6 5.55 5.5 5.45 rising falling -40 -20 25 55 85 i lim (a) temperature (c) 4.03.5 3.0 2.5 2.0 1.5 1.0 0.5 0.0 r lim = 4.02 k ? r lim = 14.3 k ? r lim = 19.4 k ? -40 -20 25 55 85 ilim(a) r lim (ko) 4.03.5 3.0 2.5 2.0 1.5 1.0 0.5 0.0 0.0 10.0 20.0 30.0 40.0 turn-on time (ms) temperature (c) 3.02.5 2.0 1.5 1.0 0.5 0.0 -40 -20 25 55 85 fon time (us) temperatures (c) 60.055.0 50.0 45.0 40.0 35.0 30.0 25.0 20.0 -20 25 55 85 -40 downloaded from: http:///
aoz1356li rev. 1.0 october 2018 www.aosmd.com page 12 of 16 functional description the aoz1356li is a current limited power switch with over-voltage, over-current, reverse-current and thermal shutdown protections. the vo ut pin is rated 28v. the switch current is rated up to 3.5a. the device has true reverse-current blocking features that will prevent undesired curren t flow from output to its input in either enabled or disabled state. enable the en pin is the on/off control for the power switch. the device is enabled when en pin is high and not in under-voltage lockout state. the en pin must be driven to a logic high or logic low state to guarantee operation. while disabled, the aoz1356li draws 6 a from supply. for aoz1356li-02, -06 toggle en pin to restart the device and clear fault flag after device latches off due to fault. input under-voltage lockout (uvlo) the under-voltage lockout (uvlo) circuit monitors the input voltage. the power switch is only allowed to turn on when input voltage is higher than uvlo threshold. otherwise the switch is off. over-voltage protection (ovp) the voltages at vin terminal is constantly monitored once the device is enabled. in case input voltage exceeds the over-voltage lockout threshold (v ovlo_r ), the power switch is either turned off immediately or kept off, depending on its initial state. aoz1356li-01, -05 can restart when vin drops below v ovlo_f . programmable current limit and over-current protection (ocp) the aoz1356li implemented cu rrent limit to ensure that the current through the switch does not exceed current limit threshold set by the external resistor r lim . the current limit threshold can be estimated using the equation below: i lim = 14300/r lim (a) for example, for 1a current limit threshold, a 14.3k ? r lim resistor should be selected. 1% resistor is recom- mended for r lim . aoz1356li continuously limits the output current when output is overloaded, under current-limiting, fltb is pulled low after delay (t ocp_fltb ). severe overload causes power dissipation and die temperature to increase and may trig ger thermal shutdown. true reverse-current bl ocking protection (trcb) true reverse-current blocking prevents undesired cur- rent flow from output to input when power switch is in either on or off state. when device is enabled, power switch is quickly turned off whenever output voltage is higher than input voltage. the power switch is turned on again when output voltage falls below input by 40mv. soft start the aoz1356li has internal soft-start circuitry to limit in- rush current due to large capacitive load. the turn-on (ton) time is 2ms. fast turn-on the fon pin allows the power switch to turn-on quickly. fon should be inserted before device is enabled. if vin>vout, the power switch turns on quickly by mini- mizing turn on delay and disabl es over-current protection. fast recovery from rcb once rcb event is removed, power switch turns on again quickly. the recovery time is 80s typ. fast role swap (frs) support the fast turn-on and fast recovery from rcb allows aoz1356li to support fast role swap operation defined in usb power delivery specif ication rev 3.0. it allows system to change its role from power consumer to power provider and recover vout voltage to >4.75v in 80s typ. thermal shutdown protection thermal shutdown protects device from excessive tem- perature. the power switch is turned off when the die temperature reaches thermal shutdown threshold of 140c. there is a 20c hysteresis. for aoz1356li-01, -05 power switch is allowed to turn on again if die tem- perature drops below approximately 120c. startup the device is enabled when en v en_h and input volt- age is above uvlo threshold. the device first checks if any fault condition exists. when no fault exists, the power switch is turned on and the output is then ramped up. power switch is kept off if fault condition was detected. fault reporting aoz1356li protects itself and load from the following fault condition: over-voltage, over-current, reverse-cur- rent, and over-temperature. the fltb pin is an open drain output. it is asserted low when either an over-current, or over-temperature condi- tion occurs. the fltb pin becomes high impedance when the fault conditions are removed. a pull-up resistor downloaded from: http:///
aoz1356li rev. 1.0 october 2018 www.aosmd.com page 13 of 16 (r fltb ) must be connected between fltb to 5v to pro- vide a logic signal. when thermal shutdown is ac tivated, fltb is pulled low immediately to report fault condition to host. fltb become impedance again once fault is removed. in case of output overload, fltb pin is pulled low about 12ms (t ocp_fltb ) after device is in current- limiting. there is no fault reporting for uvlo, ovp and rcb event. auto-restart or latch-off aoz1356li-01, -05 (auto-restart version): the device will try to restart 24ms after t he power switch is turned off and when ovp or thermal shutdown fault is removed. power switch is turned on immediately after a rcb event is removed. aoz1356li-02, -06 (latch-off version): the device keeps off even after the fault condition is removed. power switch can only be turned on again by either tog- gle en pin or recycle the input supply. input capacitor selection the input capacitor prevents large voltage transients from appearing at the input, and provides the instanta- neous current needed each time the switch turns on to charge output capacitors and to limit input voltage drop. it also prevents high-frequency noise on the power line from passing throug h to the output. the input capacitor should be located as close to the pin as possible. a mini- mum of 10 f ceramic capacitor should be used. how- ever, higher capacitor value is strongly recommended to further reduce the transient voltage drop at the input. output capacitor selection the output capacitor acts in a similar way. also, the out- put capacitor has to supply enough current for a large load that it may encounter during system transient. this bulk capacitor must be large enough to supply fast tran- sient load in order to prevent the output from dropping. there is an upper limit for output capacitor for aoz1356li to ensure the output capacitor can be charged fully during start-up. this upper limit is set by the current limit level and soft-start time. c out = i lim (t on / vin) power dissipation calculation calculate the power dissipation for normal load condi- tion using the following equation: power dissipated = r on (i out ) 2 the worst case power dissipation occurs when the load current hits the current limit due to over-current. the power dissipation can be calculated using the following equation: power dissipated = (vin ? vout) i lim layout guidelines good pcb layout is important for improving the thermal and overall performance of aoz1356li. to optimize the switch response time to output short-circuit conditions, keep all traces as short as possible to reduce the effect of unwanted parasitic inductance. place the input and output bypass capacitors as close as possible to the vin and vout pins. the input and output pcb traces should be as wide as possible for the given pcb space. use a ground plane to enhance the power dissipation capability of the device. downloaded from: http:///
rev. 1.0 october 2018 www.aosmd.com page 14 of 16 aoz1356li package dimensions, 1. 81x1.31-12, array wlcsp downloaded from: http:///
aoz1356li rev. 1.0 october 2018 www.aosmd.com page 15 of 16 tape and reel drawing, 1.81x1.31-12, array wlcsp downloaded from: http:///
aoz1356li rev. 1.0 october 2018 www.aosmd.com page 16 of 16 part marking part number description code aoz1356li-01 green product k aoz1356li-02 green product f aoz1356li-05 green product l AOZ1356LI-06 green product n pywlt aoz1356li (wlcsp) assembly lot code week code year code part number code as used herein: 1. life support devices or systems are devices or systems which, (a) are intended for surgical implant into the body or (b) support or sustain life, and (c) whose failure to perform when properly used in accordance with instructions for use provi ded in the labeling, can be reasonably expected to result in a significant injury of the user. 2. a critical component in any component of a life support, device, or system wh ose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness. legal disclaimer alpha and omega semiconductor makes no representations or warranties with respect to the accuracy or complete- ness of the information provided herein and takes no liab ilities for the consequences of use of such information or any product described herein. alpha and omega semiconductor reserves the right to make changes to such informa- tion at any time without further notice. this document does not constitute the grant of an y intellectual property rights or representation of non-infringement of any third partys intellectual property rights. life support policy alpha and omega semiconduct or products are not auth orized for use as critical components in life su pport devices or systems. downloaded from: http:///

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