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rev. 1.2 february 2018 www.aosmd.com page 1 of 16 aoz1353di 5v/3a ecpower? smart curr ent limited load switch with true rever se-current blocking general description the aoz1353di is a current-limited load switch targeting applications that require comprehensive protections. the input operating voltage range is between 3.4v and 5.5v. the output terminal is rated 28v absolute maximum. the internal current-limiting circuit protects the supply from large load current. the curren t limit level is set with an external resistor. the soft-st art circuit controls inrush current due to highly capacitive loads. the soft-start time can be optionally adjusted with an external capacitor. the device features very low quiescent current of 80a. the supply current reduces to less than 1a in shut- down. it also has under-voltage lockout (uvlo), over- voltage protection (ovp) and thermal shutdown protection. the aoz1353di has true reverse-current blocking (trcb) protection to avoid undesired reverse-current from vout to vin. the device features fast reco very to turn on power switch once reverse current blocking protection is de-activated. the aoz1353di is available in 3mm x 3mm dfn-12l package. features ? 28v voltage rating on vout pin ? 3.4v to 5.5v operating input voltage ? 3.5a current capability ? typical r on : 40m ? ? programmable current limit ? true reverse-current blocking (trcb) ? fast recovery from trcb ? adjustable soft-start ? 80a quiescent current ? over-voltage protection ? input under-voltage lockout ? thermal shutdown protection ? 4kv hbm rating ? 1kv cdm rating ? 3mm x 3mm dfn-12l package ? ul2367 file no. e326264 ? iec60950 cb certificate no. us-31249-ul applications ? usb pd power source switch ? smart phone and tablet ? notebook, ultrabook and desktop ? portable devices typical application vin c out aoz1353di on off vout fltb en ss c in r fltb c ss gnd r lim ilim downloaded from: http:///
aoz1353di rev. 1.2 february 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 package environmental AOZ1353DI-01 auto-restart 3mm x 3mm dfn-12l rohs aoz1353di-02 latch-off 3mm x 3mm dfn-12l rohs 3mm x 3mm dfn-12l (top transparent view) pin number pin name pin function 1, 2, 3 vout power output. connect to adaptor. pi n 3 is internally connected to pin 1 and pin 2. 4 fltb fault indicator, open-drain output, active-low when fault condition occurs. 5s s soft-start pin. connect a capacitor c ss from ss to gnd to set the soft-start time or short to gnd for fixed-time soft-start. 6 nc not connected internally. can leave it floated or connect to gnd. 7 gnd ground 8i l i m current limit set pin. connect a 1% resistor r lim from ilim to gnd to set the current limit threshold. 9 en enable input. active high. 10, 11, 12 vin supply input. connected to internal power regulator. pin 10 is internally connected to pin 11 and pin 12. exp exp exposed pad. connect to gnd. voutvout vout fltb ss nc vin vin vin en ilim gnd ` exp downloaded from: http:///
aoz1353di rev. 1.2 february 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, ss, fltb to gnd -0.3v 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 en, fltb to gnd 0v to 5.5v switch current (i sw ) 0a to 3.5a ambient temperature (t a ) -40c to +85c package thermal resistance 50c/w electrical characteristicst a = 25c, v in = 5v, ss pin is shorted to gnd unless otherwise specified. symbol parameter conditions min. typ. max. units general v in input supply voltage 3.4 5.5 v v uvlo_r under-voltage lockout threshold vin rising 3 3.25 3.35 v v uvlo_hys under-voltage lockout hysteresis vin falling 150 mv i in_on input quiescent current vin = 5v, i out = 0a, en = 5v 80 a i in_off input shutdown current vin = 5v, en = 0v 0.1 1 a r on switch on resistance vin = 5v, i out = 1a 40 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 fltb_lo fltb pull-down voltage i sink = 3ma 0.3 v over-voltage protection v ovlo_r over-voltage lockout threshold vin rising 5.5 5.75 6 v v ovlo_f vin falling 5.5 v ovlo_hys over-voltage lockout hysteresis 250 mv t delay_ovp ovp turn-off delay time between vin rises from 5v to 6.5v and power switch turns off 2 s over-current protection i lim current limit threshold vout = 5v, r lim = 4.02k ? 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 v out-vin, vout rising 60 mv v r_rcb rcb protection release trip po int vin-vout, vout falling 70 mv v rcb_hys rcb hysteresis v t_rcb + v r_rcb 130 mv t rcb rcb response time 2 s downloaded from: http:///
aoz1353di rev. 1.2 february 2018 www.aosmd.com page 4 of 16 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 = 1 ? f, c ss = 1nf, r lim = 14.3k ? 2.1 ms t on turn-on time (vout from 0.5v to 4.5v) vin = 5v, r l = 100 ? , c out = 1 ? f, ss pin grounded, r lim = 14.3k ? 3.4 ms electrical characteristicst a = 25c, v in = 5v, ss pin is shorted to gnd unless otherwise specified. symbol parameter conditions min. typ. max. units downloaded from: http:///
aoz1353di rev. 1.2 february 2018 www.aosmd.com page 5 of 16 functional block diagram control logic gate drive & charge pump uvlo ovlo trcb current limit vin ss vout ilim fltb gnd vin vout vcc en downloaded from: http:///
aoz1353di rev. 1.2 february 2018 www.aosmd.com page 6 of 16 timing diagrams figure 1. turn-on delay and turn-on time figure 2. ovp delay and recovery en vout t d_on t on vin vout t delay_ovp downloaded from: http:///
aoz1353di rev. 1.2 february 2018 www.aosmd.com page 7 of 16 typical performance curvest a = 25c, c out = 20f , r lim = 4.02k ? , ss pin shorted to gnd unless otherwise specified. figure 3. startup by en (r load = 1.6 ? ) figure 4. shutdown by en (r load = 1.6 ? ) figure 5. startup by vin (r load = 1.6 ? ) figure 6. shutdown by vin (r load = 1.6 ? ) figure 7. input over-voltage protection and recovery (r load = 1k ? , AOZ1353DI-01) figure 8. over-current protection (r load = 1 ? , AOZ1353DI-01) downloaded from: http:///
aoz1353di rev. 1.2 february 2018 www.aosmd.com page 8 of 16 typical performance curves (continued) t a = 25c, c out = 20f , r lim = 4.02k ? , ss pin shorted to gnd unless otherwise specified. figure 9. output hard short and thermal shutdown (AOZ1353DI-01) downloaded from: http:///
aoz1353di rev. 1.2 february 2018 www.aosmd.com page 9 of 16 typical characteristicst a = 25c, v in = 5v unless otherwise specified. figure 10. r on vs. temperature figure 11. r on vs. input voltage figure 12. input quiescent current vs. temperature f igure 13. input shutdown current vs. temperature figure 14. en threshold vs. temperature fi gure 15. en bias current vs. temperature r on (m ? ) temperature ( ? c) 55.050.0 45.0 40.0 35.0 30.0 25.0 20.0 -50 -30 -10 10 30 50 70 90 r on (m ? ) voltage (v) 48.0 46.0 44.0 42.0 40.0 38.0 36.0 34.0 3.0 3.5 4.0 4.5 5.0 5.5 6.0 input quiescent current (a) temperature ( ? c) 100 9080 70 60 50 40 30 20 10 0 -50 -30 -10 10 30 50 70 90 input shutdown current (a) temperature ( ? c) 0.80.7 0.6 0.5 0.4 0.3 0.2 0.1 0.0 -50 -30 -10 10 30 50 70 90 enable threshold voltage (v) temperature (c) 1.21.0 0.8 0.6 0.4 0.2 0.0 -50 -30 -10 10 30 50 70 90 rising falling enable bias current (a) temperature (c) 1.51.4 1.3 1.2 1.1 1.0 0.9 0.8 0.7 0.6 -50 -30 -10 10 30 50 70 90 downloaded from: http:///
aoz1353di rev. 1.2 february 2018 www.aosmd.com page 10 of 16 typical characteristics (continued) t a = 25c, v in = 5v unless otherwise specified. figure 16. uvlo threshold vs. temperature figure 17. ovp threshold vs. temperature figure 18. current limit threshold vs. temperature figure 19. rcb threshold (rising) vs. temperature figure 20. rcb threshold (falli ng) vs. temperature figure 21. turn-on delay vs. temperature uvlo threshold voltage (v) temperature (c) 3.243.20 3.16 3.12 3.08 3.04 3.00 -50 -30 -10 10 30 50 70 90 rising falling ovp threshold voltage (v) temperature (c) 5.805.75 5.70 5.65 5.60 5.55 5.50 5.45 5.40 -50 -30 -10 10 30 50 70 90 rising falling i lim (a) temperature (c) 4.03.5 3.0 2.5 2.0 1.5 1.0 0.5 0.0 -50 -30 -10 10 30 50 70 90 r lim = 4.02 k ? r lim = 14.3 k ? r lim = 29.4 k ? v t_rcb (mv) temperature (c) 80.070.0 60.0 50.0 40.0 30.0 20.0 -50 -30 -10 10 30 50 70 90 v r_rcb (mv) temperature (c) 80.0 70.0 60.0 50.0 40.0 30.0 20.0 -50 -30 -10 10 30 50 70 90 turn-on delay time (ms) temperature (c) 2.702.50 2.30 2.10 1.90 1.70 1.50 -50 -30 -10 10 30 50 70 90 downloaded from: http:///
aoz1353di rev. 1.2 february 2018 www.aosmd.com page 11 of 16 typical characteristics (continued) t a = 25c, v in = 5v unless otherwise specified. figure 22. turn-on time vs. temperat ure figure 23. current limit vs. r lim turn-on time (ms) temperature (c) 4.03.5 3.0 2.5 2.0 1.5 1.0 0.5 0.0 -50 -30 -10 10 30 50 70 90 ss pin grounded i lim (a) r lim (k ? ) 4.03.5 3.0 2.5 2.0 1.5 1.0 0.5 0.0 0 5 10 15 20 25 30 35 40 downloaded from: http:///
aoz1353di rev. 1.2 february 2018 www.aosmd.com page 12 of 16 functional description the aoz1353di 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 operating input voltage ranges from 3.4v to 5.5v. the switch current is rated up to 3.5a. the device has true reverse-current blocking features that will prevent undesired current 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 aoz1353di draws less than 1 a from supply. for aoz1353di-02, 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. AOZ1353DI-01 can restart when vin drops below v ovlo_f . programmable current limit and over-current protection (ocp) the aoz1353di implemented current 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 recommended for r lim . aoz1353di continuously limit s 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 trigger thermal shutdown. true reverse-current bl ocking protection (trcb) true reverse-current blocking prevents undesired current 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 70mv. fast recovery (for AOZ1353DI-01 only) once rcb event is removed, power switch turns on again quickly. the recovery time is less than 100s. thermal shutdown protection thermal shutdown protects device from excessive tem- perature. the power switch is turned off when the die tem- perature reaches thermal shutdown threshold of 140c. there is a 20c hysteresis. for AOZ1353DI-01 power switch is allowed to turn on again if die temperature drops below approximately 120c. soft start the aoz1353di has soft-start circuitry to limit in-rush current due to large capacitive load. by default the turn-on time is 3.4ms when ss pin is connected to gnd. fast turn-on time can be set by adding an external capacitor c ss between ss pin and ground. the capacitor value is selected using table 1. table 1. turn-on time settings by c ss startup the device is enabled when en v en_h and input voltage 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. c ss (nf) turn-on time (ms) 10 . 3 1.2 0.4 2.2 0.8 3.3 1.2 4.7 1.7 5.6 1.9 6.8 2.4 8.2 2.8 10 3.2 12 3.4 ss pin short to gnd 3.4 downloaded from: http:///
aoz1353di rev. 1.2 february 2018 www.aosmd.com page 13 of 16 fault reporting aoz1353di protects itself and load from the following fault condition: over-voltage, over-current, reverse- current, and over-temperature. the fltb pin is an open drain output. it is asserted low when either an over-current, or over-temperature condition occurs. the fltb pin becomes high impedance when the fault conditions are removed. a pull-up resistor (r fltb ) must be connected between fltb to 5v to provide a logic signal. when thermal shutdown is ac tivated, fltb is pulled low immediately to report fault condition to host. fltb is pulled high 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. for aoz1353di-02 power switch is then turned off after another 12ms. there is no fault reporting for uvlo, ovp and rcb event. auto-restart or latch-off AOZ1353DI-01 (auto-restart version): the device will try to restart 24ms after the 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. aoz1353di-02 (latch-off version): the device keeps off even after the fault condition is removed. power switch can only be turned on again by either toggle 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 is also to prevent high-frequency noise on the power line from passing through to the output. the input capacitor should be located as close to the pin as possi- ble. a minimum of 10 f ceramic capacitor should be used. however, higher capacitor value is strongly rec- ommended to further reduce the transient voltage drop at the input. output capacitor selection the output capacitor acts in a similar way. also, the output 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 transient load in order to prevent the output from dropping. there is an upper limit for output capacitor for aoz1353di 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 condition 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 aoz1353di. 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:///
aoz1353di rev. 1.2 february 2018 www.aosmd.com page 14 of 16 package dimensions, dfn3x3b_12l, ep1_s note 1. dimensioning and tolerancing conform to asme y14.5m-1994. 2. controlling dimension is millimeter. converted inch dimensions are not necessarily exact. 3. dimension b applies to metallized terminal and is measured between 0.15mm. and 0.30mm from the terminal tip. if the terminal has the optional radius on the other end of the terminal, the dimension b should not be measured in that radius area. 4. coplanarity ddd appliers to the terminals and all other bottom surface metallization. %6& %6& l e c max nom min dimensions in inches max nom a symbols min dimensions in millimeters e d b e1 a1 d1 aaa bbb ccc ddd l1 b1 l2 unit: mm recommended land pattern downloaded from: http:///
aoz1353di rev. 1.2 february 2018 www.aosmd.com page 15 of 16 tape and reel drawing dfn3x3 ep carrier tape reel dfn3x3 ep tape leader / trailer & orientation downloaded from: http:///
aoz1353di rev. 1.2 february 2018 www.aosmd.com page 16 of 16 part marking part number description code AOZ1353DI-01 green product ag01 aoz1353di-02 green product ag02 ywlt part number code special code option code ag00 aoz1353di (dfn3x3) assembly lot code week code year 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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