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march 2010 ? 2007 fairchild semiconductor corporation www.fairchildsemi.com FAN5350 rev. 1.0.5 FAN5350 ? 3mhz, 600ma step-down dc-dc converter in chip-scale and mlp packaging FAN5350 3mhz, 600ma step-down dc-dc converter in chip-scale and mlp packaging features ? 3mhz fixed-frequency operation ? 16a typical quiescent current ? 600ma output current capability ? 2.7v to 5.5v input voltage range ? 1.82v fixed output voltage ? synchronous operation ? power-save mode ? soft-start capability ? input under-voltage lockout (uvlo) ? thermal shutdown and overload protection ? 6-lead 3 x 3mm mlp ? 5-bump 1 x 1.37mm wlcsp applications ? cell phones, smart-phones ? pocket pcs ? wlan dc-dc converter modules ? pda, dsc, pmp, and mp3 players ? portable hard disk drives description the FAN5350 is a step-down switching voltage regulator that delivers a fixed 1.82v from an input voltage supply of 2.7v to 5.5v. using a proprietary architecture with synchronous rectification, the FAN5350 is capable of delivering 600ma at over 90% efficiency, while maintaining a very high efficiency of over 80% at load currents as low as 1ma. the regulator operates at a nominal fixed frequency of 3mhz at full load, which reduces the value of the external components to 1h for the output inductor and 4.7f for the output capacitor. at moderate and light loads, pulse frequency modulation is used to operate the device in power-save mode with a typical quiescent current of 16a. even with such a low quiescent current, the part exhibits excellent transient response during large load swings. at higher loads, the system automatically switches to fixed-frequency control, operating at 3mhz. in shutdown mode, the supply current drops below 1a, reducing power consumption. the FAN5350 is available in a 6-lead molded leadless package (mlp) and a 5-bump wafer level chip scale package (wlcsp). ordering information part number operating temperature range package eco status packing method FAN5350ucx -40c to 85c 5-ball, type-1 wl-csp, 1x1.37mm, .5mm pitch green tape and reel FAN5350mpx -40c to 85c 6-lead, molded leadless package (mlp), dual, jedec mo-229, 3mm square, extended dap green tape and reel for fairchild?s definition of eco status, please visit: http://www.fairchildsemi.com/company/green/rohs_green.html . please refer to tape and reel specifications at www.fairchildsemi.com ; http://www.fairchildsemi.com/packaging .
? 2007 fairchild semiconductor corporation www.fairchildsemi.com FAN5350 rev. 1.0.5 2 FAN5350 ? 3mhz, 600ma step-down dc-dc converter in chip-scale and mlp packaging typical applications c in 4.7f l1 c out v out v in b2 a3 c1 c3 vin sw en gnd fb a1 1h 4.7f agnd fb sw vin pgnd en 1 6 2 5 3 4 v in l1 v out c out c in p1 (gnd) 1 4 .7f 4.7f figure 1. wlcsp, bumps facing down figure 2. mlp, leads facing down block diagram fb gnd sw vin en 1.8v reference modulator logic driver current limit zero crossing 3mhz osc + - bias figure 3. block diagram
? 2007 fairchild semiconductor corporation www.fairchildsemi.com FAN5350 rev. 1.0.5 3 FAN5350 ? 3mhz, 600ma step-down dc-dc converter in chip-scale and mlp packaging pin configurations b2 a3 c1 c3 vin sw en gnd fb a1 b2 a3 a1 c3 c1 gnd sw fb vin en figure 4. wlcsp - bumps facing down figure 5. wlcsp - bumps facing up agnd fb sw vin pgnd en 1 6 2 5 3 4 p1 (gnd) figure 6. 3x3mm mlp - leads facing down pin definitions wlcsp pin # name description a1 v in power supply input . a3 gnd ground pin . signal and power ground for the part. c1 en enable pin . the device is in shutdown mode when voltage to this pin is <0.4v and enabled when >1.2v. do not leave this pin floating. c3 fb feedback analog input . connect directly to the output capacitor. b2 sw switching node . connection to the internal pfet switch and nfet synchronous rectifier. mlp pin # name description 1 pgnd power ground pin . power stage ground. connect pgnd and agnd together via the board ground plane. 2 agnd analog ground pin . signal ground for the part. 3 fb feedback analog input . connect directly to the output capacitor. 4 en enable pin . the device is in shutdown mode when voltage to this pin is <0.4v and enabled when >1.2v. do not leave this pin floating. 5 sw switching node . connection to the internal pfet switch and nfet synchronous rectifier. 6 v in power supply input .
? 2007 fairchild semiconductor corporation www.fairchildsemi.com FAN5350 rev. 1.0.5 4 FAN5350 ? 3mhz, 600ma step-down dc-dc converter in chip-scale and mlp packaging absolute maximum ratings stresses exceeding the absolute maximum ratings may damage the device. the device may not function or be operable above the recommended operating conditions and stressing the parts to these levels is not recommended. in addition, extended exposure to stresses above the recommended operating conditions may affect device reliability. the absolute maximum ratings are stress ratings only. symbol parameter min. max. unit v in input voltage with respect to gnd -0.3 6.0 v voltage on any other pin with respect to gnd -0.3 v in v t j junction temperature -40 +150 c t stg storage temperature -65 +150 c t l lead temperature (soldering 10 seconds) +260 c esd electrostatic discharge protection level human body model 4.5 kv charged device model mlp 1.5 wlcsp 2.0 machine model 200 v recommended operating conditions the recommended operating conditions table defines the conditions for actual device operation. recommended operating conditions are specified to ens ure optimal performance to the datasheet specifications. fairchild does not recommend exceeding them or designing to absolute maximum ratings. symbol parameter min. typ. max. unit v cc supply voltage range 2.7 5.5 v i out output current 0 600 ma l inductor 0.7 1.0 3.0 h c in input capacitor 3.3 4.7 12.0 f c out output capacitor 3.3 4.7 12.0 f t a operating ambient temperature -40 +85 c t j operating junction temperature -40 +125 c thermal properties symbol parameter min. typ. max. units ja_wlcsp junction-to-ambient thermal resistance (1) 180 c/w ja_mlp junction-to-ambient thermal resistance (1) 49 c/w note: 1. junction-to-ambient thermal resistance is a function of application and board layout. this data is measured with four-layer 1s2p boards in accordance to jesd51- jede c standard. special attention must be paid not to exceed junction temperature t j(max) at a given ambient temperate t a .
? 2007 fairchild semiconductor corporation www.fairchildsemi.com FAN5350 rev. 1.0.5 5 FAN5350 ? 3mhz, 600ma step-down dc-dc converter in chip-scale and mlp packaging electrical characteristics minimum and maximum values are at v in = 2.7v to 5.5v, t a = -40c to +85c, c in = c out = 4.7f, l = 1h, unless otherwise noted. typical values are at t a = 25c, v in =3.6v. symbol parameter conditions min. typ. max. units power supplies i q quiescent current device is not switching, en=v in 16 a device is switching, en=v in 18 25 a i (sd) shutdown supply current v in = 3.6v, en = gnd 0.05 1.00 a v uvlo under-voltage lockout threshold rising edge 1.8 2.1 v falling edge 1.75 1.95 v (enh) enable high-level input voltage 1.2 v v (enl) enable low-level input voltage 0.4 v i (en) enable input leakage current en = v in or gnd 0.01 1.00 a oscillator f 0sc oscillator frequency 2.5 3.0 3.5 mhz regulation v o output voltage accuracy i load = 0 to 600ma 1.775 1.820 1.865 v ccm 1.784 1.820 1.856 v t ss soft-start en = 0 -> 1 300 s output driver r ds(on) pmos on resistance v in = v gs = 3.6v 180 m nmos on resistance v in = v gs = 3.6v 170 m i lim pmos peak current limit open-loop (2) 650 800 900 ma t tsd thermal shutdown ccm only 150 c t hys thermal shutdown hysteresis 20 c note: 2. the electrical characteristics table reflects open-loop data. refer to operation description and typical characteristic for closed-loop data.
? 2007 fairchild semiconductor corporation www.fairchildsemi.com FAN5350 rev. 1.0.5 6 FAN5350 ? 3mhz, 600ma step-down dc-dc converter in chip-scale and mlp packaging operation description the FAN5350 is a step-down sw itching voltage regulator that delivers a fixed 1.82v from an input voltage supply of 2.7v to 5.5v. using a proprietary architecture with synchronous rectification, the FAN5350 is capable of delivering 600ma at over 90% efficiency, while maintaining a light load efficiency of over 80% at load currents as low as 1ma. t he regulator operates at a nominal frequency of 3mhz at full load, which reduces the value of the external components to 1h for the output inductor and 4.7f for the output capacitor. control scheme the FAN5350 uses a proprietary non-linear, fixed- frequency pwm modulator to deliver a fast load transient response, while maintaining a constant switching frequency over a wide range of operating conditions. the regulator performance is independent of the output capacitor esr, allowing for the use of ceramic output capacitors. although this type of operation normally results in a switching frequency that varies with input voltage and load current, an internal frequency loop holds the switching frequency constant over a large range of input voltages and load currents. for very light loads, the FAN5350 operates in discontinuous current (dcm) single-pulse pfm mode, which produces low output ripple compared with other pfm architectures. transition between pwm and pfm is seamless, with a glitch of less than 14mv at v out during the transition between dcm and ccm modes. combined with exceptional transient response characteristics, the very low quiescent current of the controller (<16a) maintains high efficiency, even at very light loads, while preser ving fast transient response for applications requiring very tight output regulation. enable and soft start maintaining the en pin low keeps the FAN5350 in non-switching mode in which all circuits are off and the part draws ~50na of current. increasing en above its threshold voltage activates the part and starts the soft- start cycle. during soft start, the current limit is increased in discrete steps so that the inductor current is increased in a controlled manner. this minimizes any large surge currents on the input and prevents any overshoot of the output voltage. under-voltage lockout when en is high, the under-voltage lock-out keeps the part from operating until the input supply voltage rises high enough to properly operate. this ensures no misbehavior of the regulator during start-up or shutdown. current limiting a heavy load or short circuit on the output causes the current in the inductor to increase until a maximum current threshold is reached in the high-side switch. upon reaching this point, the high-side switch turns off, preventing high currents from causing damage. the peak current limit shown in figure 16, i lim(pk) is slightly higher than the open-loop tested current limit, i lim(ol) , in the electrical characteristics table. this is primarily due to the effect of propagation delays of the ic current limit comparator. thermal shutdown when the die temperature increases, due to a high load condition and/or a high ambient temperature, the output switching is disabled until the temperature on the die has fallen sufficiently. the junction temperature at which the thermal shutdown activates is nominally 150c with a 20c hysteresis.
? 2007 fairchild semiconductor corporation www.fairchildsemi.com FAN5350 rev. 1.0.5 7 FAN5350 ? 3mhz, 600ma step-down dc-dc converter in chip-scale and mlp packaging applications information selecting the inductor the output inductor must meet both the required inductance and the energy handling capability of the application. the inductor value affects the average current limit, the pwm-to-pfm transition point, the output voltage ripple, and the efficiency. the ripple current ( ? i) of the regulator is: ? ? ? ? ? ? ? ? ? ? ? sw out in in out f l v v v v i (1) the maximum average load current, i max(load) is related to the peak current limit, i lim(pk) (see figure 17) by the ripple current: 2 i i i ) pk ( lim ) load ( max ? = (2) the transition between pfm and pwm operation is determined by the point at which the inductor valley current crosses zero. the regulator dc current when the inductor current crosses zero, i dcm , is: 2 i i dcm = (3) the FAN5350 is optimized for operation with l=1 h, but is stable with inductances ranging from 700nh to 3.0 h. the inductor should be rated to maintain at least 80% of its value at i lim(pk) . efficiency is affected by the inductor dcr and inductance value. decreasing the inductor value for a given physical size typically decreases the dcr; but since ? i increases, the rms current increases, as do the core and skin effect losses. 12 i i i 2 2 ) dc ( out rms + = (4) the increased rms current produces higher losses through the r ds(on) of the ic mosfets as well as the inductor esr. increasing the inductor value produces lower rms currents, but degrades transient response. for a given physical inductor size, increased inductance usually results in an inductor with lower saturation current. table 1 shows the effects of inductance higher or lower than the recommended 1 h on regulator performance. output capacitor table 2 suggests 0603 capacitors. 0805 capacitors may further improve performance in that the effective capacitance is higher and esl is lower than 0603. this improves the transient response and output ripple. increasing c out has no effect on loop stability and can therefore be increased to reduce output voltage ripple or to improve transient response. output voltage ripple, ? v out , is: ? ? ? ? ? ? ? ? + ? ? ? = esr f c 8 1 i v sw out out ( 5) input capacitor the 4.7 f ceramic input capacitor should be placed as close as possible between the vin pin and gnd to minimize the parasitic inductance. if a long wire is used to bring power to the ic, additional ?bulk? capacitance (electrolytic or tantalum) should be placed between c in and the power source lead to reduce ringing that can occur between the inductance of the power source leads and c in . table 1. effects of changes in inductor value (fr om 1h recommended value) on regulator performance inductor value i max(load) eq. 2 i lim(pk) ? v out eq. 5 transient response increase increase decrease decrease degraded decrease decrease increase increase improved
? 2007 fairchild semiconductor corporation www.fairchildsemi.com FAN5350 rev. 1.0.5 8 FAN5350 ? 3mhz, 600ma step-down dc-dc converter in chip-scale and mlp packaging pcb layout guidelines for the bill of materials of the FAN5350 evaluation board, see table 1. there are only three external components: the inductor and the input and output capacitors. for any buck switcher ic, including the FAN5350, it is always important to place a low-esr input capacitor very close to the ic, as shown in figure 7. that ensures good input decoupling, which helps reduce the noise appearing at the output terminals and ensures that the control sections of the ic do not behave erratically due to excessive noise. this reduces switching cycle jitter and ensures good overall performance. it is not consider ed critical to place either the inductor or the output capacitor very close to the ic. there is some flexibility in moving these two components further away from the ic. table 2. FAN5350 evaluation board bill of materials (optional parts are installed by request only) figure 7. the FAN5350 evaluation board pcb (csp) feedback loop one key advantage of the non-linear architecture is that there is no traditional feedback loop. the loop response to changes in v out is essentially instantaneous, which explains its extraordinary transient response. the absence of a traditional, high-gain compensated linear loop means that the FAN5350 is inherently stable over a wide range of l out and c out . l out can be reduced further for a given application, provided it is confirmed that the calculated peak current for the required maximum load current is less than the minimum of the closed-loop current limit. the advantage is that this generally leads to improved transient response, since a small inductance allows for a much faster increase in current to cope with any sudden load demand. the inductor can be increased to 2.2h; but, for the same reason, the transient response gets slightly degraded. in that case, incr easing the output capacitor to 10f helps significantly. description qty. ref. vendor part number inductor 1.2 h, 1.8a, 55m 1 l1 toko 1117as-1r2m 1.3 h, 1.2a, 90m fdk mipsa2520d1r0 1.5 h, 1.3a taiyo yuden cbc3225t15mr capacitor 4.7 f, 10%, 6.3v, x5r, 0603 2 c in ,c out murata grm39 x5r 475k 6.3 ic dc/dc regulator in csp, 5 bumps 1 u1 fairchild FAN5350ucx load resistor (optional) 1 r load any
? 2007 fairchild semiconductor corporation www.fairchildsemi.com FAN5350 rev. 1.0.5 9 FAN5350 ? 3mhz, 600ma step-down dc-dc converter in chip-scale and mlp packaging typical performance characteristics v in = 3.6v, t a = 25c, v en = v in , according to the circuit in figure 1 or figure 2, unless otherwise specified. 10 12 14 16 18 20 22 24 2.5 3.0 3.5 4.0 4.5 5.0 5.5 battery voltage (v) quiescent current (a) -40c +85c +25c 1790 1800 1810 1820 1830 1840 1850 0 100 200 300 400 500 600 load current (ma) dc output voltage (mv) dcm spreading ccm figure 8. quiescent current vs. battery voltage figure 9. load regulation, increasing load 0 100 200 300 400 500 600 2.5 3.0 3.5 4.0 4.5 5.0 5.5 load current (ma) continuous conduction mode discontinuous conduction mode hysteresis battery voltage (v) switching mode changes at these borders 85c ccm border 85c dcm border -30c dcm border -30c ccm border 0 100 200 300 400 500 600 2.5 3.0 3.5 4.0 4.5 5.0 5.5 load current (ma) battery voltage (v) figure 10. switch mode operating areas figure 11. switch mode over temperature 2.00 1.75 1.50 1.25 1.00 0.75 0.50 0.25 0 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 1.1 load current (a) output voltage (v) v in =5.5v v in =3.6v v in =2.7v ambient temperature (c) output voltage (mv) 1800 1805 1810 1815 1820 1825 1830 1835 v in =5.5v v in =3.6v v in =2.7v -40-200 20406080 i load =300ma figure 12. dc current voltage output characteris tics figure 13. output voltage vs. temperature
? 2007 fairchild semiconductor corporation www.fairchildsemi.com FAN5350 rev. 1.0.5 10 FAN5350 ? 3mhz, 600ma step-down dc-dc converter in chip-scale and mlp packaging typical performance characteristics (continued) v in = 3.6v, t a = 25c, v en = v in , according to the circuit in figure 1 or figure 2, unless otherwise specified. 60 65 70 75 80 85 90 95 100 0.001 0.010 0.100 1.000 power efficiency (%) v in =2.5v v in =2.7v v in =3.3v v in =3.6v v in =4.2v v in =5v v in =5.5v load current (a) 100 95 90 85 80 75 0.001 0.010 0.100 1.000 power efficiency (%) load current (a) +85c +25c -40c figure 14. power efficiency vs. load current figure 15. power efficiency over temperature range 1.3 1.2 1.1 1.0 0.9 0.8 0.7 -40-20 0 20 406080 ambient temperature (c) current limit (a) v in =5.5v v in =2.7v v in =3.6v 0 5 0 1 0 0 1 5 0 2 0 0 2 5 0 2 . 5 3 . 0 3 . 5 4 . 0 4 . 5 5 . 0 5 . 5 shutdown current (na) battery voltage (v) +85c +25c -40c figure 16. pmos current limit in closed loop figure 17. shutdown supply current vs. battery voltage 85db 5db /div 35db 250ma load 1hz 10hz 100hz 1khz 10khz 2.7 2.8 2.9 3.0 3.1 3.2 3.3 2.7 2.9 3.1 3.3 3.5 3.7 3.9 4.1 4.3 4.5 4.7 4.9 5.1 5.3 5.5 frequency (mhz) battery voltage (v) -40c +85c +25c figure 18. power supply rejection ratio in ccm figure 19. switching frequency in ccm
? 2007 fairchild semiconductor corporation www.fairchildsemi.com FAN5350 rev. 1.0.5 11 FAN5350 ? 3mhz, 600ma step-down dc-dc converter in chip-scale and mlp packaging i l , 0.5a / div. v out , 0.5v / div. en, 5.0v / div. i l , 0.5a / div. v out , 0.5v / div. en, 5.0v / div. i load , 0.5a / div. v out(ac) , 20mv / div. i load , 0.5a / div. v out(ac) , 20mv / div. i load = 600ma v out(ac) , 20mv / div. i load = 300ma v sw , 5v / div. i load = 50ma v out(ac) , 20mv / div. i load = 1ma v sw , 5v / div. h scale: 20s / div. h scale: 10s / div. h scale: 1s / div. h scale: 1s / div. h scale: 20s / div. h scale: 20s / div. typical performance characteristics (continued) v in = 3.6v, t a = 25c, v en = v in , according to the circuit in figure 1 or figure 2, unless otherwise specified. figure 20. startup, full load figure 21. startup, no load figure 22. fast load transient, no load to full load figure 23. fast load transient, full load to no load figure 24. fast load transient in ccm figure 25. fast load transient in dcm
? 2007 fairchild semiconductor corporation www.fairchildsemi.com FAN5350 rev. 1.0.5 12 FAN5350 ? 3mhz, 600ma step-down dc-dc converter in chip-scale and mlp packaging i load , 0.5a / div. v out , 20mv / div. v out(ac) , 20mv / div. v out(ac) , 20mv / div. v out(ac) , 20mv / div. i l = 0.2a / div. v sw , 2v / div. v out(ac) , 20mv / div. i l = 0.1a / div. v sw , 2v / div. v in = 3.6v v in = 3.0v v in = 3.6v v in = 3.0v v sw , 2v / div. i load = 300ma v out , 20mv / div. v sw , 5v / div. i load = 20ma h scale: 20s / div. h scale: 2ms / div. h scale: 10s / div. h scale: 10s / div. h scale: 1s / div. h scale: 200ns / div. i load = 350ma v out(ac) , 10mv / div. i load = 100ma v in = 3.0v v in = 3.6v h scale: 5s / div. typical performance characteristics (continued) v in = 3.6v, t a = 25c, v en = v in , according to the circuit in figure 1 or figure 2, unless otherwise specified. figure 26. fast load transient dcm ? ccm ? dcm figure 27. slow load transient dcm ? ccm ? dcm figure 28. line transient, 600mv, 50ma load figure 29. line transient, 600mv, 50ma load figure 30. combined line (600mv) and load (100ma to 350ma) transient response figure 31. typical waveforms in dcm, 50ma load figure 32. typical waveforms in ccm, 150ma load
? 2007 fairchild semiconductor corporation www.fairchildsemi.com FAN5350 rev. 1.0.5 13 FAN5350 ? 3mhz, 600ma step-down dc-dc converter in chip-scale and mlp packaging physical dimensions b. dimensions are in millimeters. c. dimensions and tolerances per a. conforms to jedec registration mo-229, variation weea, dated 11/2001 asme y14.5m, 1994 0.10 cab 0.05 c top view bottom view recommended land pattern 0.15 c 0.08 c b a 3.0 3.0 0.05 0.00 2.25 1.65 1.90 0.15 c 2x 2x 0.45 0.20 0.8 max side view seating plane 2.45 0.95 typ 0.10 c pin #1 ident 1 3 4 6 (0.70) 0.30~0.45 0.2 min 0.95 2.10 3.50 0.45 typ (0.20) c pin #1 ident except for dap extension tabs 3.50 0.40 0.45 1.65 figure 33. 6-lead molded leadless package (mlp) package drawings are provided as a service to customers considering fairchild components. drawings may change in any manner without notice. please note the revision and/or date on the drawing and contact a fairchild semiconductor representative to ver ify or obtain the most recent revision. package specifications do not expand the terms of fairchild?s worldwide terms and condition s, specifically the warranty therein, which covers fairchild products. always visit fairchild semiconductor?s online packaging area for the most recent package drawings: http://www.fairchildsemi.com/packaging/ .
? 2007 fairchild semiconductor corporation www.fairchildsemi.com FAN5350 rev. 1.0.5 14 FAN5350 ? 3mhz, 600ma step-down dc-dc converter in chip-scale and mlp packaging physical dimensions (continued) a1 e 0.625 max seating plane 0.06 c 5 x ?0.315 +/- .025 top view bottom view (?0.35) solder mask opening (?0.25) cu pad recommended land pattern (nsmd) ball a1 index area 0.03 c 0.05 c d 2x (y)+/-.018 (x)+/-.018 b a d 0.2500.025 c 12 a b c 0.03 c 2x e 0.005 cab 0.50 0.433 0.50 (0.50) (0.433) (0.866) 3 0.3320.018 side views b. dimensions are in millimeters. c. dimensions and tolerances per a. no jedec registration applies asme y14.5m, 1994 d datum c, the seating plane, is defined by the spherical crowns of the balls. e package typical height is 582 microns +/- 43 microns (539-625 microns) for dimensions d, e, x, and y see product datasheet. g. ball composition: sn95.5ag3.9cu0.6 sac405 alloy h. drawing filename: mkt-uc005aarev5 f f f f f product specific dimensions product d e x y FAN5350ucx 1.350 +/- 0.040 0.980 +/- 0.040 0.242 0.244 figure 34. 5-bump wafer-level chip-scale package (wlcsp) package drawings are provided as a service to customers considering fairchild components. drawings may change in any manner without notice. please note the revision and/or date on the drawing and contact a fairchild semiconductor representative to ver ify or obtain the most recent revision. package specifications do not expand the terms of fairchild?s worldwide terms and condition s, specifically the warranty therein, which covers fairchild products. always visit fairchild semiconductor?s online packaging area for the most recent package drawings: http://www.fairchildsemi.com/packaging/ .
? 2007 fairchild semiconductor corporation www.fairchildsemi.com FAN5350 rev. 1.0.5 15 FAN5350 ? 3mhz, 600ma step-down dc-dc converter in chip-scale and mlp packaging

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