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aat4674 data sheet power supply selector switch 1 skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 201911a ? skyworks proprietary information ? products and product information are subject to change without notice. ? apr il 26, 2012 general description the aat4674-1 is a member of skyworks' application specific power management smartswitch? family. this device is a dual input single output power supply selector switche designed to operate from batteries, or any other power supply with an input voltage up to 6v. the aat4674-1 connects the supply voltage on in1 to out, or in2 to out, through a very low r ds(on) power mosfet that minimizes voltage drops and power dissi- pation. the enable (en) and select (sel) pin voltages control the operational state of the internal power mosfet switches. once enabled, the sel pin will switch between the in1 and in2 inputs. if both input voltages are below the uvlo, then the aat467-1 output floats. if one of the input voltages is above the uvlo threshold then that input voltage that is above the uvlo threshold is passed through to the output. the two power switches are current limited and the cur- rent limit thresholds can be programmed through the resistors on iin1 and iin2 pins respectively. the aat4674-1 is available in the thermally enhanced, space-saving pb-free 12-pin tsopjw package. the 4674- 1 is specified for operation over the -40c to +85c temperature range. features ? input voltage supply range: 2.5v to 6v ? high level of integration: ? reverse blocking diode ? current sensing ? programmable current limit ? single control pin switching ? break-before-make switch-over ? minimum output voltage drop during change-over ? shutdown current < 1 a ? thermal protection ? tsopjw-12 package applications ? bluetooth? headsets ? cell phones ? digital still cameras ? mp3 players ? personal data assistants (pdas) ? set top boxes typical application in1 out iin1 iin2 +5v r iin1 r iin2 +3.3v in1/in2 select system load en in2 sel gnd enable
aat4674 data sheet power supply selector switch 2 skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 201911a ? skyworks proprietary information ? products and product information are subject to change without notice. ? apr il 26, 2012 pin descriptions pin number name type function 1, 2 in1 i power supply 1 input. 3, 4 in2 i power supply 2 input. 5 en i enable pin, active low. 6, 7 gnd i/o ground. 8 sel i in2 or in1 select input. logic ?0? ? out = in1 logic ?1? ? out = in2 9 iin2 i in2-out switch current limit set resistor input. 10 iin1 i in1-out switch current limit set resistor input. 11, 12 out o output pin. pin configuration tsopjw-12 (top view) 1 2 3 4 5 6 12 11 10 9 8 7 in1 in1 in2 in2 en gnd out out iin1 iin2 sel gnd
aat4674 data sheet power supply selector switch 3 skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 201911a ? skyworks proprietary information ? products and product information are subject to change without notice. ? apr il 26, 2012 absolute maximum ratings 1 symbol description value units v inx [in1, in2] to gnd -0.3 to 6.5 v v n [out, en, iin1, iin2, sel] to gnd -0.3 to v inx + 0.3 v t lead maximum soldering temperature (at leads) 300 c i out maximum output current 3 a thermal information 2 symbol description value units ? ja maximum thermal resistance 160 c/w p d maximum power dissipation 625 mw t j operating junction temperature range -40 to 150 c 1. stresses above those listed in absolute maximum ratings may cause permanent damage to the device. functional operation at co nditions 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.
aat4674 data sheet power supply selector switch 4 skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 201911a ? skyworks proprietary information ? products and product information are subject to change without notice. ? apr il 26, 2012 electrical characteristics 1 v inx = 5v, t a = -40 to +85c, unless otherwise noted. typical values are at t a = 25c. symbol description conditions min typ max units operation v in1 in1 operating voltage range 2.5 6 v v in2 in2 operating voltage range 2.5 6 v v uvlo_in1 in1 under-voltage lockout rising edge 2.3 v hysteresis 0.1 v uvlo_in2 in2 under-voltage lockout rising edge 2.3 v hysteresis 0.1 i in1_op in1 normal operating current 2 v in1 = 5v, v en = 0v 10 30 a i in1_shdn in1 shutdown mode current v in1 = v en = 5v, out open 1 a i in1_slp in1 sleep current v in1 = 2.5v, v in2 = 5v, v en =0v 1 5 a i in2_op in2 normal operating current 2 v in2 = 5v, v en = 0v 10 30 a i in2_shdn in2 shutdown mode current v in2 = v en = 5v, out open 1 a i in2_slp in2 sleep current v in1 = 5v, v in2 = 2.5v, v en = 0v 1 5 a power switches r ds(on) in1 in1-to-out fet on-resistance v in1 = 5.0v, t a = 25c 0.12 0.15 ? v in1 = 3.5v, t a = 25c 0.14 0.18 r ds(on) in2 in2-to-out fet on-resistance v in2 = 5.0v, t a = 25c 0.12 0.15 ? v in2 = 3.5v, t a = 25c 0.14 0.18 v droop_out out voltage droop from the lower voltage of in1 and in2, when switching over between in1 and in2 i o(out) = 0.5a, c o(out) = 10 f 150 mv current regulation t soft_start soft-start delay delay of start from en, or uvlo 100 s i lim_range in1/in2 current limit range 0.2 2.0 a i lim_acc in1/in2 current limit accuracy r iin1/iin2 = 100k ? 0.8 1 1.2 a logic control / protection v ih(en) logic high threshold 1.6 v v il(en) logic low threshold 0.4 v t shdn chip thermal shutdown temperature threshold 140 c hysteresis 15 1. the aat4674 is guaranteed to meet performance specifications over the -40c to +85c operating temperature range and is assu red by design, characterization, and correla- tion with statistical process controls. 2. additional operating current is required by the r iinx current limit setting resistors. the amount of current required by the r iinx resistors is the current limit divided by 1000. therefore i inx_op = (0.5v/r iinx )*(200k/1000) or approximately i lim /1000.
aat4674 data sheet power supply selector switch 5 skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 201911a ? skyworks proprietary information ? products and product information are subject to change without notice. ? apr il 26, 2012 typical characteristics i in1 shutdown current vs. temperature temperature (c) i in1 shutdown current (a) -0.4 -0.2 0 0.2 0.4 0.6 0.8 -40 -15 10 35 60 85 v in1 = 6.5v v in1 = 5v v in1 = 4.2v v in1 = 3.6v i in2 shutdown current vs. temperature temperature (c) i in2 shutdown current (a) -0.4 -0.2 0 0.2 0.4 0.6 0.8 -40 -15 10 35 60 85 v in2 = 6.5v v in2 = 5v v in2 = 4.2v v in2 = 3.6v i in1 operation current vs. temperature (i out = 0a) temperature (c) i in1 operation current (a) 4 6 8 10 12 14 16 18 20 -40 -15 10 35 60 85 v in1 = 6.5v v in1 = 5v v in1 = 4.2v v in1 = 3.6v i in2 operation current vs. temperature (i out = 0a) temperature (c) i in2 operation current (a) 4 6 8 10 12 14 16 18 20 -40 -15 10 35 60 8 5 v in2 = 6.5v v in2 = 5v v in2 = 4.2v v in2 = 3.6v r ds(on) vs. temperature temperature (c) r ds(on) (m ) 0 50 100 150 200 250 -40 -15 10 35 60 85 110 v in = 2.5v v in = 3.5v v in = 5v v in = 6.5v enable threshold vs. input voltage input voltage (v) enable threshold (v) 0.6 0.65 0.7 0.75 0.8 0.85 0.9 0.95 1 1.05 1.1 2.5 3 3.5 4 4.5 5 5.5 6 6. 5 v il(en) v ih(en)
aat4674 data sheet power supply selector switch 6 skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 201911a ? skyworks proprietary information ? products and product information are subject to change without notice. ? apr il 26, 2012 typical characteristics i in1 sleep current vs. v in1 voltage (v in2 = 6.5v) v in1 voltage (v) i in1 sleep current (a) 0 0.5 1 1.5 2 2.5 2.5 3 3.5 4 4.5 5 5.5 6 85c 25c -40c i in2 sleep current vs. v in2 voltage (v in1 = 6.5v) v in2 voltage (v) i in2 sleep current (a) 0 0.5 1 1.5 2 2.5 2.5 3 3.5 4 4.5 5 5.5 6 -40c 25c 85c current limit vs. r iin1/iin2 (v in1 = 5v; v in2 = 3.3v; v out = v in2 or v out = v in1 ) r iin1/iin2 (k ) current limit (a) 0 0.25 0.5 0.75 1 1.25 1.5 1.75 2 2.25 50 100 150 200 250 300 350 400 450 50 0 turn-on/off response (r out = 10 ; v in = 5v) time (100s/div) v out (5v/div) v en (2v/div) i out (500ma/div) 0v 2v 0v 0a 3.3v to 5v transition response (i out = 500ma, c out = 10f) time (40s/div) v out (1v/div) v sel (2v/div) 5v 2v 3.3v 0v 5v to 3.3v transition response (i out = 500ma, c out = 10f) time (40s/div) v out (1v/div) v sel (2v/div) 3.3v 0v 5v 2v
aat4674 data sheet power supply selector switch 7 skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 201911a ? skyworks proprietary information ? products and product information are subject to change without notice. ? apr il 26, 2012 typical characteristics 3.6v to 3.6v transition response (i out = 500ma, c out = 10f) time (40s/div) v out (1v/div) v sel (2v/div) 0v 2v 3.6v 3.6v short circuit through 0.3 response time (10s/div) i out (5a/div) v out (5v/div) v in (2v/div) 5v 0a 0.6v 2a 5v short circuit through 0.6 response time (10s/div) i out (5a/div) v out (5v/div) v in (2v/div) 5v 0a 5v 1.2v 2a thermal shutdown response (v in = 5v) time (40ms/div) i out (2a/div) v out (2v/div) v en (2v/div) 0a 0v 2v 0v
aat4674 data sheet power supply selector switch 8 skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 201911a ? skyworks proprietary information ? products and product information are subject to change without notice. ? apr il 26, 2012 functional description to power the output, both input supplies (in1 and in2) must be above the uvlo threshold. if either supply input is below the uvlo threshold then the output of the aat4674-1 will be the input supply that is above the uvlo threshold. if both supplies are above the uvlo threshold and the device is enabled, the aat4674-1 will connect the supply from in1 to out when the sel pin is low (logic ?0?), and when the sel pin is high (logic ?1?) then the supply on in2 is connected to the out pin. consult the above ?truth table? for the summarized aa4674-1 operational details. the two internal power switches are current limited and the limiting thresholds can be programmed through the resistors on the iin1 and iin2 pins respectively. applications information input capacitors a 1 f or greater capacitor is generally recommended between in1 and gnd (c in1 ), and between in2 and gnd (c in2 ). an input capacitor is not required for basic opera- tion; however, it is useful in preventing load transients from affecting up-stream circuits. ceramic, tantalum, or aluminum electrolytic capacitors may be selected for c in1 / c in2 . there is no specific capacitor equivalent series resis- tance (esr) requirement for c in1 /c in2 . however, for higher current operation, ceramic capacitors are recommended for c in1 /c in2 due to their inherent capability over tantalum capacitors to withstand input current surges from low impedance sources such as batteries in portable devices. functional block diagram logic control thermal and current sense in2 en gnd out sel in1 switch 1 iin1 iin2 switch 2 truth table y = yes, n = no, x = don?t care. input conditions aat4674-1 v out v in1 > uvlo v in2 > uvlo sel n n x floating ynxv in1 nyxv in2 yy0v in1 yy1v in2
aat4674 data sheet power supply selector switch 9 skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 201911a ? skyworks proprietary information ? products and product information are subject to change without notice. ? apr il 26, 2012 output capacitor a 1 f or greater capacitor is required between out and gnd (c out ). as with the input capacitor, there is no spe- cific capacitor esr requirement. if desired, c out may be increased to accommodate any load transient condition. en input the aat4674-1 is enabled when v en is 0.4v (logic ?0?), conversely the aat4674-1 is disabled when v en is 1.6v (logic ?1?). sel input when v sel is 0.4v (logic ?0?) the output voltage equals power supply 1 input (v out = v in1 ), and conversely when v sel is 1.6v (logic ?1?) the output voltage equals power supply 2 input (v out = v in2 ). current limit resistor selection the current limits for power supply 1 and power supply 2 inputs are set by resistors connected between iin1/iin2 and gnd. the following equation can be used to select the appropriate resistor for a particular current limit: i clinx = 200 k v iinx r iinx ?? ?? i clinx current limit for in1 and/or in2 pins respectively v iinx internally regulated voltage [0.5v 20%] on the iin1 and iin2 pins respectively r iinx iin1 and/or iin2 resistor 200k internal gain factor design example a particular application requires that the current limit for in1 be set to 2a and the current limit for in2 be set to 0.2a. what value of resistor is required for the iin1 and iin2 pins respectively? for in1 (power supply 1 input): r iin1 = 200k v iin1 i clin1 ?? ?? = = 50k (49.9k standard value) 200k 0.5v 2a ?? ?? for in2 (power supply 2 input): r iin2 = 200k v iin2 i clin2 ?? ?? = = 500k (499.9k standard value ) 200k 0.5v 0.2a ?? ?? thermal considerations since the aat4674-1 has an internal current limit and over-temperature protection (thermal shutdown), junc- tion temperature is rarely a concern. however, if the application requires large currents in a high temperature environment, it is possible that temperature rather than current limit will be the dominant regulating condition. in these applications, the maximum current available with- out risk of an over-temperature condition must be calcu- lated. the maximum internal temperature while current limit is not active can be calculated using equation 1. eq. 1: t j(max) = i max 2 r ds(on)(max) r ja + t a(max) in equation 1, i max is the maximum current required by the load. r ds(on)(max) is the maximum rated r ds(on) of the aat4674-1 at high temperatures (consult the ?r dson vs. temperature? performance graph in the ?typical characteristics? section of this datasheet). for estimat- ing the r ds(on)(max) use the data on the ?r dson vs temperature? performance graph and increase the value from the performance graph by 50%. r ja is the thermal resistance between the aat4674-1 and the printed cir- cuit board (pcb) onto which it is mounted; r ? ja is the thermal resistance of the tsopjw-12 package. t a(max) is the maximum ambient temperature that the pcb under the aat4674-1 would be if the aat4674-1 were not dis- sipating power. equation 1 can be rearranged to solve for i max , into equation 2. eq. 2: = i max t sd(min) - t a(max) r ds(on)(max) r ja t sd(min) is the minimum temperature required to activate the aat4674-1 over-temperature protection (thermal shutdown). with typical specification of 140c, 125c is a safe minimum value to use.
aat4674 data sheet power supply selector switch 10 skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 201911a ? skyworks proprietary information ? products and product information are subject to change without notice. ? apr il 26, 2012 for example, for a 2.5v input power supply application that is specified to operate in 50c environments where the pcb operates at temperatures as high as 85c. the application is sealed and its pcb is small, causing r ja to be approximately 160c/w. the r ds(on)(max) is estimate to be 300m (from the ?r ds(on) vs. temperature? perfor- mance graph, where v in = 2.5v at 85c plus 50%). to find the maximum current (i max ) for this application use equation 2: = i max = 0.913 a 125c - 85c 300m 160 c/w pcb layout recommendations for proper thermal management, to minimize pcb trace resistance, and to take advantage of the low r ds(on) val- ues of the two internal power switches in the aat4674- 1, certain circuit board layout rules should be followed: in1, in2, and out should be routed using wider than normal traces. the two in1 pins (1 and 2) and two in2 pins (3 and 4) should be connected to the same wide pcb trace; and gnd should be connected to a ground plane. for best performance, the input capacitors (c in1 / c in2 ) and output capacitors (c out ) should be placed as close to the package pins as possible. the aat4674-1 evaluation board layout follows the printed circuit board layout recommendations and can be used as an example of an optimal board layout.
aat4674 data sheet power supply selector switch 11 skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 201911a ? skyworks proprietary information ? products and product information are subject to change without notice. ? apr il 26, 2012 evaluation board schematic 1 2 3 4 6 7 8 9 10 11 12 5 aat4674-1 u1 c1 2.2f c2 2.2f c3 2.2f r3 49.9k r2 49.9k r1 100k 1 2 header 2 j1 main aux en gnd pwrsel out imain iaux out out iin1 iin2 sel gnd in1 in1 in2 in2 en gnd figure 1: aat4674-1 evaluation board schematic. evaluation board layout figure 2: aat4674-1 evaluation figure 3: aat4674-1 evaluation board top side layout. board bottom side layout.
aat4674 data sheet power supply selector switch 12 skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 201911a ? skyworks proprietary information ? products and product information are subject to change without notice. ? apr il 26, 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. ordering information package marking 1 part number (tape and reel) 2 tsopjw-12 ytxyy AAT4674ITP-1-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. package information tsopjw-12 0.20 + 0.10 - 0.05 0.055 0.045 0.45 0.1 5 7 nom 4 4 3.00 0.10 2.40 0.10 2.85 0.20 0.50 bsc 0.50 bsc 0.50 bsc 0.50 bsc 0.50 bsc 0.15 0.05 0.9625 0.0375 1.00 + 0.10 - 0.065 0.04 ref 0.010 2.75 0.25 all dimensions in millimeters. 1. xyy = assembly and date code. 2. sample stock is generally held on part numbers listed in bold .

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