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AAT4685 over-voltage protection switch with ocp and bovp data sheet 1 skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 201960a ? skyworks proprietary information ? products and product information are subject to change without notice. ? may 16, 2012 general description the AAT4685 ovpswitch? is a member of skyworks' application specific power mosfet? (aspm?) product family. it is an n-channel mosfet power switch with precise over-voltage protection control, designed to pro- tect low-voltage systems against high-voltage faults up to +28v. it also integrates over-current protection (ocp), battery over-voltage protection (bovp) and over- temperature protection (otp). when the input voltage exceeds the programmed over- voltage threshold, the n-channel mosfet switch will be turned off to prevent damage to the output load circuits. an external resistor divider is adopted to program the adjustable version over-voltage trip point. over-current protection protects the case of output short circuits by disconnecting the load from the input supply. a battery voltage monitor is integrated and disconnect the in and out when the battery voltage exceed its rated voltage. the AAT4685 also monitors its own die tempera- ture and ovp switch off if it becomes too hot. the AAT4685 includes an under-voltage lockout (uvlo) protection circuit, which puts the device into sleep mode at low input voltages only consuming 100 a current. it also includes two indicators: input supply power good indicator (pok) which is always active whether en is low or high, and a fault flag indicator (flt) which goes to active low when a fault condition (ov, oc, bov and ot) occurs at en = low. the AAT4685 is offered in a pb-free, 3x3mm 12-pin tdfn package with a pin-out optimized for safety and is specified for operation over the -40c to +85c ambient temperature range. features ? v in range: 3.0v ? 28v ? ovp threshold setting range: 4v ? 7v ? fixed: 5.85v and 6.8v ? adjustable ? fast ovp response: 1 s (max) response to over-voltage transient ? ovp recovery delay time: 8ms ? over-current protection ? adjustable 0.3 ? 1.8a ? battery ovp 4.35v ? thermal shutdown protection ? low quiescent current ? 600 a typical ? 100 a typical standby current ? under-voltage lockout ? 120m typical r ds(on) at 5.0v ? active low enable with internal 200k pull-down resistor ? input supply power good indicator, open drain ? ovp/ocp/bovp/ot fault indicator, open drain ? temperature range: -40c to 85c ? 3x3mm tdfn-12 package applications ? ? cell phones ? ? digital still cameras ? ? mp3 ? ? personal data assistants (pdas) typical application c1 1f c2 1f in ovp flt en out gnd v in 3.0v C 28v v out fault flag ocp bovp pok v io v io ic AAT4685 r ovp1 r ovp2 r ocp bat
AAT4685 over-voltage protection switch with ocp and bovp data sheet 2 skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 201960a ? skyworks proprietary information ? products and product information are subject to change without notice. ? may 16, 2012 pin descriptions pin # symbol function 1 ocp over-current protection threshold input. connect resistor to ground to set ocp limit. 2 ic internally connected. connect this pin to ground. 3 en active low enable with internal 200k resistor pull down to gnd 4 pok input supply power-good status pin, open-drain. the pok function is always active whether en is low or high. connect a 1k to 100k pull-up resistor to the logic i/o voltage of the host system. 5,6 out output. connect a 0.1 f~47uf capacitor from out to gnd. 7,8 in power input pin. connect 1 f capacitor from in to gnd. 9 gnd ground connection. 10 flt open-drain output. active low when input over-voltage, input over-current, battery over-voltage, or over temperature and en = low. the flt pin goes to high impedance state when en = high. connect a 1k to 100k pull-up resistor to the logic i/o voltage of the host system. 11 bovp battery voltage sense input. connect to battery positive terminal through a 100k resistor to limit the current in case of a short circuit condition. 12 ovp (n/c) over-voltage protection threshold input (adjustable only). fixed version not connected. pin configuration tdfn33-12 (top view) ocp ic en 1 pok out out ovp (n/c) bovp flt gnd in in 2 3 4 5 6 12 11 10 9 8 7
AAT4685 over-voltage protection switch with ocp and bovp data sheet 3 skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 201960a ? skyworks proprietary information ? products and product information are subject to change without notice. ? may 16, 2012 1. stresses above those listed in absolute maximum ratings may cause permanent damage to the device. functional operation at c onditions other than the operating conditions specified is not implied. only one absolute maximum rating should be applied at any one time. 2. mounted on a fr4 board. 3. derate 25mw/c above 25c. absolute maximum ratings 1 symbol description value units v in in to gnd -0.3 to 28 v v n bovp, ovp , ocp, out , ic to gnd -0.3 to v p +0.3 v v p flt, en, pok to gnd -0.3 to 7.5 v i max maximum continuous switch current 1.9 a t j operating junction temperature range -40 to 150 c t s storage temperature range -65 to 150 c t lead maximum soldering temperature (at leads, 10 sec) 300 c thermal characteristics symbol description value units ? ja maximum thermal resistance 2 50 ? c/w p d maximum power dissipation 2, 3 2w
AAT4685 over-voltage protection switch with ocp and bovp data sheet 4 skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 201960a ? skyworks proprietary information ? products and product information are subject to change without notice. ? may 16, 2012 1. the AAT4685 is guaranteed to meet performance specification over the -40 to 85c operating temperature range and are assured by design, characterization and correlation with statistical process controls. electrical characteristics 1 v in = 5v, v bovp = 4.2v, v /en = 0v , r ocp = 30k ? , t a = -40c to 85c unless otherwise noted. typical values are at t a = 25c. symbol description conditions min typ max units v in input voltage range 3 28 v i q operation quiescent current i out = 0, r ocp = 30k 600 800 a i stdby standby current (only uvlo and ovp circuit is ?enable?, other function blocks are all ?disable?) en = 5v, v out = 0 100 150 a v uvlo under-voltage lockout threshold rising edge 2.5 2.7 2.9 v v uvlo_hys under-voltage lockout hysteresis 0.1 v tdgl deglitch time, input power detected status time measured from v in 0v to 5v; 1 s rise time to output turn on 8ms input ovp ? adjustable (AAT4685-1) ( measured at ovp pin ) v ovp_th over-voltage lockout threshold rising edge 0.97 1.0 1.03 v v ovp_hys over-voltage lockout threshold hysteresis 20 mv v ovp_range over-voltage lockout threshold adjustable range 47v t resp_ov over-voltage response time v ovp rise to 1.13v from 1.07v in 1ns 1.0 s t ovp_rec recovery time from input over-voltage release v ovp fall to 1.07v from 1.13v in 1ns 8 ms input ovp ? fixed (AAT4685-2 and AAT4685-3) ( measured at in pin ) v ovpt overvoltage protection trip voltage AAT4685-2 rising edge 6.60 6.80 7.0 v AAT4685-3 5.71 5.85 6.0 v v ovp_hys over-voltage protection trip point hysteresis 60 mv t resp_ov over-voltage response time v in rise to 7.5v from 5v 1.0 s t ovp_rec recovery time from input over-voltage release v in fall to 5v from 7.5v 8 ms input ocp i ocp over-current range (programmable) 0.3 1.8 a ? i ocp /i ocp over-current trip tolerance rising edge. r ocp = 30k ? 0.9 1.0 1.1 a t ocp_bl blanking time, input over-current detected 180 s t ocp_rec recovery time from input over-current condition 64 ms battery ovp ( measured at bovp pin ) v bovpt battery over-voltage protection trip voltage rising edge 4.2 4.35 4.5 v v bovp_hys battery over-voltage protection trip point hysteresis 275 mv i bovp battery ovp pin input current 100 na t bovp_bl battery ovp pin blanking time 180 s
AAT4685 over-voltage protection switch with ocp and bovp data sheet 5 skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 201960a ? skyworks proprietary information ? products and product information are subject to change without notice. ? may 16, 2012 1. the AAT4685 is guaranteed to meet performance specification over the -40 to 85c operating temperature range and are assured by design, characterization and correlation with statistical process controls. electrical characteristics 1 v in = 5v, v bovp = 4.2v, v /en = 0v , r ocp = 30k ? , t a = -40c to 85c unless otherwise noted. typical values are at t a = 25c. symbol description conditions min typ max units ovp switch r ds(on) on-resistance r ocp = 16.5k ? , i out = 1200ma 120 200 m ? i d(off) switch off-leakage en = 5v 1 a logic control and protection v en(l) en input low voltage 0.4 v v en(h) en input high voltage 1.2 v i en(h) en input current v en = 5.0v, internal pulldown = 200k 25 a v flt flt output low voltage i flt = 4ma 0.4 v i flt flt output leakage v in = 0v, flt = 5.5v 1 a v pok pok output low voltage i pok = 4ma 0.4 v i pok pok output leakage v in = 0v, pok = 5.5v 1 a t on ovp switch turn on delay time en from 0v to 5v; r out = 10 ? ; c out = 1 f8 ms t shdn chip thermal shutdown temperature threshold 140 oc hysteresis 15
AAT4685 over-voltage protection switch with ocp and bovp data sheet 6 skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 201960a ? skyworks proprietary information ? products and product information are subject to change without notice. ? may 16, 2012 typical characteristics operation quiescent current vs. temperature temperature (c) i q (a) -40 -15 10 35 60 85 580 590 600 610 620 standby current vs. temperature temperature (c) i sb (a) -40 -15 10 35 60 85 85 90 95 100 105 110 operation quiescent and standby current vs. supply voltage supply voltage (v) current (a) 3.0 3.5 4.0 4.5 5.0 5.5 6.0 6.5 7.0 7.5 0 100 200 300 400 500 600 700 i q i sb under-voltage lockout threshold vs. temperature temperature (c) uvlo threshold (v) -40 -15 10 35 60 85 2.55 2.60 2.65 2.70 2.75 2.80 uvlo_hi uvlo_lo AAT4685-1 input ovp threshold vs. temperature temperature (c) ovp threshold (v) -40 -15 10 35 60 85 0.97 0.98 0.99 1.00 1.01 ovp_rising ovp_falling battery over-voltage protection trip voltage vs. temperature (v in = 5.0v) temperature (c) v bovpt (v) -40 -15 10 35 60 85 4.00 4.05 4.10 4.15 4.20 4.25 4.30 4.35 4.40 4.45 4.50 battery ovp_thresh_hi battery ovp_thresh_low
AAT4685 over-voltage protection switch with ocp and bovp data sheet 7 skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 201960a ? skyworks proprietary information ? products and product information are subject to change without notice. ? may 16, 2012 typical characteristics en v ih and v il vs. supply voltage supply voltage (v) v en (v) 3.0 3.5 4.0 4.5 5.0 5.5 6.0 6.5 7.0 0.60 0.65 0.70 0.75 0.80 0.85 0.90 v ih v il en pin vs. temperature (v in = 5.0v) temperature (c) v en (v) -40 -15 10 35 60 85 0.60 0.65 0.70 0.75 0.80 0.85 0.90 v ih v il over-current limit vs. r ocp r ocp (k) i ocp (a) 0.00 0.25 0.50 0.75 1.00 1.25 1.50 1.75 2.00 2.25 10 100 nmos on-resistance vs. temperature temperature (c) r ds(on) (m) -40 -15 10 35 60 85 95 110 125 140 155 normal power-on startup (r out = 6.3) time (2ms/div) v in (2v/div) i out (500ma/div) v out (2v/div) over-current protection (i out switches from 0.8a to 1.5a, i lim = 1a) time (50s/div) v in (5v/div) i out (500ma/div) flt (5v/div) v out (2v/div) 5v
AAT4685 over-voltage protection switch with ocp and bovp data sheet 8 skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 201960a ? skyworks proprietary information ? products and product information are subject to change without notice. ? may 16, 2012 typical characteristics over-voltage protection response for input step (v in = 5v to 12v) time (20s/div) v in (2v/div) flt (5v/div) v out (2v/div) recovery from over-voltage protection (v in = 7v to 5v) time (2ms/div) v in (2v/div) i out (500ma/div) flt (5v/div) v out (2v/div) battery over-voltage protection (v bovp steps from 3.8v to 4.5v) time (100s/div) v bovp (1v/div) i out (500ma/div) flt (5v/div) v out (2v/div) recovery from battery over-voltage protection (v bovp = 4.5v to 3.8v) time (500s/div) v bovp (1v/div) i out (500ma/div) flt (5v/div) v out (2v/div) battery over-voltage protection (v bovp cycles between 4v and 4.5v) time (20ms/div) v bovp (2v/div) flt (5v/div) v out (2v/div) power-up into short circuit on the out pin time (200ms/div) v in (5v/div) v out (5v/div) flt (5v/div) i out (500ma/div)
AAT4685 over-voltage protection switch with ocp and bovp data sheet 9 skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 201960a ? skyworks proprietary information ? products and product information are subject to change without notice. ? may 16, 2012 functional block diagram ocp uvlo driver control and timer bias and bg int regulator flt out bovp gnd ovp in ocp en int _v p int _v p int _v p int _v p otp option cp por pok detect pok ovp switch v ref v ref v ref functional description the AAT4685 provides up to 28v over-voltage and over- current protection when powering low-voltage systems such as cell phones, mp3, and pdas or when charging lithium ion batteries from a badly regulated supply. the AAT4685 is inserted between the power supply or char- ger source and the load to be protected. the AAT4685 ic consists of a low resistance ovp switch, under-voltage lockout protection, over-voltage monitor and protection, over-current protection, battery over-voltage protection, fast shut-down circuitry and a fault output flag. in normal operation the ovp switch acts as a slew-rate controlled load switch, connecting and disconnecting the power supply from in to out. a low resistance n chan- nel mosfet is used as to minimize the voltage drop between the voltage source and the load and to reduce the power dissipation. when the voltage on the input exceeds the programmed over-voltage trip point, the device immediately turns off the internal ovp switch disconnecting the load from the abnormal voltage, preventing damage to any down- stream components. in the case of an over current con- dition, it limits the system current at the threshold value, and if the over current persists, the ovp switch is turned off after a blanking period. if the battery voltage rises to an unsafe level (bovp threshold), the ic disconnects out from the charging input power in until the battery voltage returns to an acceptable value. bovp or ocp blanking time ignores short time transients of over-bat- tery voltage and overload current. additionally, AAT4685 also monitors its own die temperature and turns the ovp switch off if it becomes too hot. the AAT4685 has a fault flag (flt) pin to indicate the fault conditions of input power over-voltage, load current over-current, battery over-voltage, and over-tempera- ture by pulling the flag signal down to alert the system. if an input over-voltage condition or over-voltage battery condition exists at the time of the device enable, then the ovp switch will remain off and flt is always low.
AAT4685 over-voltage protection switch with ocp and bovp data sheet 10 skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 201960a ? skyworks proprietary information ? products and product information are subject to change without notice. ? may 16, 2012 under-voltage lockout (uvlo) the AAT4685 has a fixed 2.7v under-voltage lockout level (uvlo) trip level for in rising. when the input volt- age is less than 2.7v - v uvlo_hys , the ovp switch is turned off. 100mv of hysteresis is included to ensure circuit stability. over-voltage protection (ovp) the AAT4685 adjustable version has a 1.0v 3% over- voltage trip threshold on the ovp pin. with a resistor divider on ovp pin from in to gnd, the over-voltage protection point of in can be adjusted between 4v and 7v. if the over-voltage trip level is triggered, the ovp switch will start to be turned off in 1 s. the flt pin is driven low. when the input voltage pin returns below v ovpt ? v ovp_hys (but is still above v uvlo ), the ovp switch is turned on again after a t ovp_rec recovery time to ensure that the input supply has stabilized. fixed ovp products are also available where the resistive divider is internally integrated. pin 12 is designed to be not connected. over-current protection (ocp) the AAT4685 integrates adjustable over-current protec- tion. once the load current exceeds the pre-set limit of i ocp current (i load >i ocp ), the load current is limited after the ocp blanking time (typical 180 s). during the ocp blanking time, the ovp switch stays on. once the load current drops below i ocp , current restriction will be removed. if the over-current state continues after the blanking period, the ovp switch turns off and flt is pulled down. in order to prevent the input voltage from spiking up due to the inductance of the input cable, the ovp switch is turned off slowly, resulting in a "soft-stop." the ovp switch will turn back on again after t ocp_rec (typical 64ms) and the current is monitored all over again. each time an ocp fault occurs, an internal counter is incremented. if 15 ocp faults occur in one charge cycle, the ovp switch is turned off permanently. the counter is cleared either by removing and re-applying input power, or by disabling and re-enabling the device via the en pin. the ocp threshold is set by an external resistor (r ocp ) connected between ocp and ground. i ocp is approxi- mated by the following formula: i ocp = (current in a, resistance in k) 30 r ocp battery over-voltage protection (bovp) the AAT4685 monitors the positive battery terminal and turns the ovp switch off when the battery voltage exceeds the bovp threshold (typical 4.35v). the monitor has blanking time t bovp_bl (typical 180 s) to prevent any transient voltage from false triggering the bovp. a resis- tor is required between the bovp pin and the battery, to limit the current in case of a short circuit condition. if the battery voltage exceeds the bovp trip threshold v bovpt , the ovp switch is turned off, and the flt pin is driven low. in order to prevent the input voltage from spiking up due to the inductance of the input cable, the ovp switch is turned off slowly , resulting in a "soft-stop." the ovp switch is turned back on once the battery voltage drops to v bovpt ? v bovp_hys . each time a battery over- voltage fault occurs, an internal counter is incremented. if 15 such faults occur in one charge cycle, the ovp switch is turned off permanently. the counter is cleared either by removing and re-applying input power, or by disabling and re-enabling the device via the en pin. over-temperature protection (ot protection) if the junction temperature of the device exceeds t shdn , the ovp switch is turned off, and the flt pin is driven low. the ovp switch is turned back on when the junction temperature falls below t shdn - 15c. fault indicator (flt) the flt output is an active-low open-drain fault (ov/oc/ bovp/ot) reporting output. a pull-up resistor should be connected from flt to the logic i/o voltage of the host system. when en is low, flt is asserted by pulling down in the case of an over-voltage, over-current, or battery over-voltage or over-temperature fault occuring; flt is de-asserted into high impedance state with the fault removed. when en is high, flt is in high impedance status.
AAT4685 over-voltage protection switch with ocp and bovp data sheet 11 skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 201960a ? skyworks proprietary information ? products and product information are subject to change without notice. ? may 16, 2012 enable control (en) en is an active low enable with internal 200k resistor pulled down to gnd. en is driven low, connected to ground, or left floating for normal device operation. set en low to turn the ovp switch on after turn on delay time. set en high to turn the ovp switch off. in the case of an over-voltage or uvlo condition toggling en will not override the fault condition and the ovp switch will remain off. the ocp counter and the bovp counter are both reset when the device is re-enabled by the en pin. ic input internally connected to gnd through a 100k resistor. connect this pin to ground. power?ok indicator (pok) the AAT4685 contains an open-drain pok output that goes low when a valid input source is detected at the in pin. the valid input range is between v uvlo (typical 2.7v) and v ovp voltage (fixed 5.85v / fixed 6.8v / adjustable ovp threshold set by external resistors). after a valid input has been established, charging is sustained. the pok function is always active whether the en pin is at low or high state. device start-up operation on initial power-up, if v uvlo < in < v ovp , v bat < v bovp , and en is low, the ovp switch starts to turn on after t on delay time (typical 8ms) to be stabilized for input. this turn on uses soft start to control the inrush current to minimize ringing at the input. because of the deglitch time at power on, if the input voltage rises rapidly past the ovp threshold, the device does not switch on at all; instead it goes into protection mode and indicate a fault on the flt pin. after successful start-up, if i load > i ocp limit the device turns off and the fault flag is asserted. the soft start function is defined as follows: "current limit is stepped digitally from low level to its final current limit level for soft starting."
AAT4685 over-voltage protection switch with ocp and bovp data sheet 12 skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 201960a ? skyworks proprietary information ? products and product information are subject to change without notice. ? may 16, 2012 system flowchart flt state flt state flt state turn off ovp swtch, flt = l v bat > bovp y v in > ovp n blanking time 180 s y nn count <15 ? turn off ovp switch, flt = l, incr bovp counter i > i ocp v(in) < ovp wait t ovp _rec (8ms ) en = h blanking time 180 s y n turn off ovp switch, flt = l, incr ocp counter count <15 ? en = h wait t ocp_rec (64ms) n y n y n y n y n y y n y v bat < bovp goto standby goto standby n y flt state turn off ovp swtch, flt = hiz y t j > t shdn n t j < t shdn -15 n y limit current power on uvlo : on v(in) > uvlo n y turn on ovp switch, flt = hiz ovp : on all functions off reset : timers reset counters reset flt = hiz en = l n y bovp, tsd : on flt=hiz ocp : on n y wait t dgl (8ms) standby any state : if v(in) < uvlo go to power on if en = h go to standby
AAT4685 over-voltage protection switch with ocp and bovp data sheet 13 skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 201960a ? skyworks proprietary information ? products and product information are subject to change without notice. ? may 16, 2012 application information over-voltage protection resistors the over-voltage protection threshold is programmed with two resistors, r1 and r2. to limit the current going through the external resistor string while maintaining good noise immunity, use smaller resistor values, such as 10k for r2. using a larger value will further reduce the system current, but will also increase the impedance of the ovp node, making it more sensitive to external noise and interference. a suggested value for r2 is 100k . r1 can be calculated using the following equation: r 1 = - 1 r 2 = (v ovp - 1) 100 v ovp v ovp_th table 1 summarizes 1% standard metal film resistors for several over-voltage settings. r2 (k ) r1 (k )v ovp setting (v) 100 300 4.0 100 348 4.5 100 402 5.0 100 442 5.5 100 499 6.0 100 549 6.5 100 604 7.0 table 1: 1% standard resistor values for ovp setting. over-current protection resistor the over-current threshold is programmed by an exter- nal resistor (r ocp ) connected from the ocp pin to gnd. r ocp can be calculated by the following equation. r ocp = 1000 30 i ocp table 2 summarizes 1% standard metal film resistors for several over-current settings. r3 (k )i ocp setting (a) 100.0 0.30 86.6 0.35 75.0 0.40 66.5 0.45 60.4 0.50 54.9 0.55 49.9 0.60 43.0 0.70 37.4 0.80 33.2 0.90 30.1 1.00 24.9 1.20 21.5 1.40 18.7 1.60 16.5 1.80 table 2: 1% standard resistor values for ocp setting. input capacitor a 1 f or larger capacitor is typically recommended for c in . c in should be located as close to the device in pin as practically possible. ceramic, tantalum, or aluminum electrolytic capacitors may be selected for c in . there is no specific capacitor equivalent series resistance (esr) requirement for c in . however, for higher current opera- tion, ceramic capacitors are recommended for c in due to their inherent capability over tantalum capacitors to withstand input current surges from low impedance sources such as batteries in portable devices. capacitors are typically manufactured in different volt- age ratings. if the maximum possible surge voltage is known, select capacitors with a voltage rating at least 5v higher than the maximum possible surge voltage. 50v rated capacitors are generally good for most ovp appli- cations to prevent any surge voltage.
AAT4685 over-voltage protection switch with ocp and bovp data sheet 14 skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 201960a ? skyworks proprietary information ? products and product information are subject to change without notice. ? may 16, 2012 output capacitor in order to insure stability while current limit is active, a small output capacitance of approximately 1 f is required at the output. likewise, with the output capacitor, there is no specific capacitor esr requirement. if desired, c out may be increased to accommodate any load transient condition. pcb layout recommendations for proper thermal management and to take advantage of the low r ds (on) of the AAT4685, certain circuit board layout rules should be followed: 1. v in and v out should be routed using wider than nor- mal traces. 2. gnd should be connected to a ground plane. the ground plane area connected to the ground pins should be made as large as possible. exposed pad should be connected to ground plane to get best power dissipation. 3. for best performance, c in and c out should be placed close to the in and out pins. evaluation board schematic c1 1f c2 1f v in r3 30k green led disable v out AAT4685 ic 2 ocp 1 en 3 bovp 11 ovp 12 pok 4 out 5 gnd 9 flt 10 in 8 out 6 in 7 u1 r1 604k r5 1.74k r6 1.74k r4 100k r2 100k +5v +5v red led 1 2 batt figure 1: AAT4685 evaluation board schematic.
AAT4685 over-voltage protection switch with ocp and bovp data sheet 15 skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 201960a ? skyworks proprietary information ? products and product information are subject to change without notice. ? may 16, 2012 evaluation board layout figure 2: AAT4685 evaluation board figure 3: AAT4685 evaluation board top side layout. bottom side layout. evaluation board bill of materials designator part number description manufacturer u1 AAT4685iwp-1-t1 ic over-voltage protection switch with ocp skyworks c1, c2 grm21br71h105k cap ceramic 1 f 0805 x7r 50v 10% murata r1 rc0603fr-07604kl res 604k 1/10w 1% 0603 smd yageo r3 rc0603fr-0730k1l res 30.1k 1/10w 1% 0603 smd r2, r4 rc0603fr-07100kl res 100k 1/10w 1% 0603 smd r5, r6 rc0603fr-071k74rl res 1.74k 1/10w 1% 0603 smd led1 0805krct led red 0805 hb led2 0805kgct led green 0805 table 3: AAT4685 evaluation board bill of materials (bom).
AAT4685 over-voltage protection switch with ocp and bovp data sheet 16 skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 201960a ? skyworks proprietary information ? products and product information are subject to change without notice. ? may 16, 2012 1. xyy = assembly and date code. 2. sample stock is generally held on part numbers listed in bold . 3. the leadless package family, which includes qfn, tqfn, dfn, tdfn and stdfn, has exposed copper (unplated) at the end of the lead terminals due to the manufacturing process. a solder fillet at the exposed copper edge cannot be guaranteed and is not required to ensure a proper bottom solder c onnection. ordering information package ovp trip voltage marking 1 part number (tape and reel) 2 tdfn33-12 adjustable 8lxyy AAT4685iwp-1-t1 tdfn33-12 6.80v AAT4685iwp-2-t1 tdfn33-12 5.85v AAT4685iwp-3-t1 skyworks green? products are compliant with all applicable legislation and are halogen-free. for additional information, refer to skyworks de?ition of green , document number sq04-0074. packaging information tdfn33-12 top view bottom view detail "a" side view 3.00 0.05 index area detail "a" 1.70 0.05 3.00 0.05 0.05 0.05 0.23 0.05 0.75 0.05 2.40 0.05 pin 1 indicator (optional) 0.40 0.05 0.45 0.05 0.23 0.05 0.1 ref c0.3 all dimensions in millimeters.
AAT4685 over-voltage protection switch with ocp and bovp data sheet 17 skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 201960a ? skyworks proprietary information ? products and product information are subject to change without notice. ? may 16, 2012 copyright ? 2012 skyworks solutions, inc. all rights reserved. information in this document is provided in connection with skyworks solutions, inc. (?skyworks?) products or services. these m aterials, including the information contained herein, are provided by skyworks as a service to its customers and may be used for informational purposes only by the customer. skyworks assumes no responsibility fo r errors or omissions in these materials or the information contained herein. sky- works may change its documentation, products, services, speci cations or product descriptions at any time, without notice. skyworks makes no commitment to update the materials or informati on and shall have no responsibility whatsoever for con icts, incompatibilities, or other dif culties arising from any future changes. no license, whether express, implied, by estoppel or otherwise, is granted to any intellectual property rights by this document . skyworks assumes no liability for any materials, products or information provided here- under, including the sale, distribution, reproduction or use of skyworks products, information or materials, except as may be p rovided in skyworks terms and conditions of sale. the materials, products and information are provided ?as is? without warranty of any kind, whether express, implied, statutory, or otherwise, including fitness for a particular purpose or use, merchantability, performance, quality or non-infringement of any intellectual property right; all such warranti es are hereby expressly disclaimed. skyworks does not warrant the accuracy or completeness of the information, text, graphics or other items contained within these materials. sk yworks shall not be liable for any damages, in- cluding but not limited to any special, indirect, incidental, statutory, or consequential damages, including without limitation , lost revenues or lost profits that may result from the use of the materials or information, whether or not the recipient of materials has been advised of the possibility of such damage. skyworks products are not intended for use in medical, lifesaving or life-sustaining applications, or other equipment in which the failure of the skyworks products could lead to personal injury, death, physical or en- vironmental damage. skyworks customers using or selling skyworks products for use in such applications do so at their own risk and agree to fully indemnify skyworks for any damages resulting from such improper use or sale. customers are responsible for their products and applications using skyworks products, which may deviate from published speci cations as a result of design defects, errors, or operation of products outside of pub- lished parameters or design speci cations. customers should include design and operating safeguards to minimize these and other risks. skyworks assumes no liabi lity for applications assistance, customer product design, or damage to any equipment resulting from the use of skyworks products outside of stated published speci cations or parameters. skyworks, the skyworks symbol, and ?breakthrough simplicity? are trademarks or registered trademarks of skyworks solutions, inc ., in the united states and other countries. third-party brands and names are for identi cation purposes only, and are the property of their respective owners. additional information, including relevant terms and co nditions, posted at www.skyworksinc.com, are incorporated by reference.

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