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april 2015 ? 2014 fairchild semiconductor corporation www.fairchildsemi.com fan25800 ? rev. 1. 5 fan25800 500 ma, low - i q , low - noise , ldo regulator fan25800 500 ma , low - i q , low - noise , ldo regulator features ? v in : 2.3 v to 5. 5 v ? v out = 2.7 v, 3. 3 v (i out m ax . = 500 ma) ? v out = 2. 8 v (i out m ax . = 25 0 ma) ? output noise density at 250 ma and 10 khz = 19 nv/ hz (integrated 8 vrms) ? low i q of 1 7 a in regulation and low - i q drop o ut mode with optimized dropout transitions ? < 7 0 mv dropout voltage at 250 ma load ? controlled soft - start to reduce inrush current ? thermal shutdown protection (tsd) ? input under - voltage lockout (uv l o) ? short - circuit protection (scp) ? stable with two 1.5 f, 0201 ceramic capacitors at vout ? 4 - ball wlcsp, 0.65 mm x 0.65 mm , 0.35 mm pitch, plated solder, 330 m maximum thickness applications ? wifi modules ? pda handsets ? smart phones, tablets, portable d evices description the fan25800 is a linear low - dropout regulator with a high psrr (85 db at 100 hz ) and l ow o utput n oise ( typically 8 v rms over a 10 hz to 100 khz bandwidth) . the ldo can provide up to 50 0 ma of output current . the enable control pin can be used to shut down the device and disconnect the output load from the input. during shutdown, the supply current drops below 1 a. the fan25800 is designed to be stable with space - saving ceramic capacitors as small as 0201 case size. the fan25800 is available in a 4 - bump, 0.35 mm pitc h, wlcsp package. figure 1 . typical application ordering information part number ( 1 ) v out i out _max operating temperature package packing method fan25800 auc33x 3.3 v 500 ma - 40 c to 85 c 4 - bump, wlcsp, 0.65 x 0.65 mm, 0.35 mm pitch tape & reel fan25800 auc28 x 2.8 v 25 0 ma fan25800 auc f 27 x 2.7 v 50 0 ma note: 1. for other trim options, please contact a fairchild representative . 1 . 5 f v o u t v i n f a n 2 5 8 0 0 1 . 5 f g n d e n 1 . 5 f
? 2014 fairchild semiconductor corporation www.fairchildsemi.com fan25800 ? rev. 1. 5 2 fan25800 500 ma, low - i q , low - noise , ldo regulator b lock diagram figure 2 . ic and system block diagram table 1 . recommended external components component description vendor parameter typ. unit c in 1.5 f, 6.3 v, x5r, 0201 murata grm033r60j155m c 1.5 ( 2 ) f c out 2x1.5 f, 6.3 v, x5r, 0201 murata grm033r60j155m 1.5 ( 2 ) f c alternative ( 3 ) 1.0 f, 6.3 v, x5r, 0201 murata grm033r60j105m 1.0 ( 2 ) f notes: 2. capacitance value does not reflect effects of bias, tolerance, and temperature. see recommended operating conditions and operation description sections for more information. 3. c alternative can be used for both c in and c out . fan25800 is stable with one 1 f at c in and one 1 f at c out . pin configuration figure 3 . top - through view figure 4 . bottom view pin definitions pin # name description a1 vin input voltage . connect to input power source and c in . a2 vout output voltage . connect to c out and load. b1 en enable . the device is in shutdown mode when this pin is low . no internal pull - down. do not leave this pin floating. recommended to not tie en pin directly to vin . ( 4 ) b2 gnd ground . power and ic ground. all signals are referenced to this pin. note: 4. recommended to u se logic voltage of 1.8 v to drive the en pin . q 1 v o u t c o u t e n g n d v r e f c i n v i n f i l t e r b 1 a 2 v i n e n g n d a 1 b 2 v o u t b 1 a 2 a 1 g n d v i n e n b 2 v o u t
? 2014 fairchild semiconductor corporation www.fairchildsemi.com fan25800 ? rev. 1. 5 3 fan25800 500 ma, low - i q , low - noise , ldo regulator 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 v cc voltage on any other pin (with respect to gnd) - 0.3 v in +0.3 ( 5 ) v t j junction temperature - 40 +150 c t stg storage temperature - 65 +150 c t l lead soldering temperature, 10 seconds +260 c esd electrostatic discharge protection level human body model, ansi/esda/jedec js - 001 - 2012 4000 v charged device model per jesd22 - c101 1500 lu latch up jesd 78d note: 5. lesser of 6.0 v or v in + 0.3 v. recommended operating conditions the recommended operating conditions table defines the conditions for actual device operation. recommended operating conditions are specified to ensure 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 in supply voltage 2.3 5. 5 ( 6 ) v i out _max ( 7 ) output current ( v out = 2.7 v, 3.3 v) 500 ma i out _recommend output current ( v out = 3.3 v) 500 ma output current ( v out = 2.7 v, 2.8 v) 250 ma c in input capacitor (effective capacitance) ( 8 ) 0.4 0.8 f c out output capacitor (effective capacitance) ( 8 ) 0.4 0.8 15.0 f t a ambient temperature C j junction temperature C note: 6. f or v in 3.4 v, thermal properties of the device must be taken into account at maximum load of 500 ma; refer to ? ja thermal properties . 7. i out_max is for v in = v out + 0.3 v . 8. effective capacitance, including the effects of bias, tolerance, and temperature. see the operation description section for more information. thermal properties junction - to - ambient thermal resistance is a function of application and board layout. this data is measured with four - layer 2s2p boards in accordance to jedec standard jesd51. special attention must be paid not to exceed junction temperature, t j(max) , at a given ambient temperature, t a . symbol parameter typ. unit ? ja junction - to - ambient thermal resistance 180 c/w
? 2014 fairchild semiconductor corporation www.fairchildsemi.com fan25800 ? rev. 1. 5 4 fan25800 500 ma, low - i q , low - noise , ldo regulator electrical specifications minimum and maximum values are at v in = v out + 0.3 v; t a = - 40c to +85c; and test circuit shown in figure 1 . typical values are at v in = v out + 0.3 v, t a = 25c, i load = 10 ma, and v en = 1.8 v , unless otherwise noted. symbol parameter conditions min. typ. max. unit ldo i in v in supply current v in = v out + 0.3 v to 4.2 v , i load = 0 ma 1 7 .0 25.0 a dropout ( 10 ) , i load = 0 ma 18.5 30.0 psrr power supply rejection ratio ( 9 ) i out = 10 ma, v in = 3.6 v , v out = 3.3 v f = 50 hz 84 db f = 100 hz 85 f = 1 khz 84 f = 10 khz 79 i out = 250 ma, v in = 3.6 v , v out = 3.3 v f = 50 hz 68 f = 100 hz 73 f = 1 khz 75 f = 10 khz 76 e n output noise voltage density ( 9 ) f = 10 khz , v out = 3.3 v i out = 10 ma 20 40 nv/hz i out = 250 ma 19 39 e n_bw output noise voltage ( i ntegrated) ( 9 ) f = 10 hz C 100 khz , v out = 3.3 v i out = 10 ma 8 25 v rms i out = 250 ma 8 25 v do v out dropout voltage ( 10 ) v out = v out_target C 100 mv, i out = 250 ma 70 1 3 0 mv v out v out voltage accuracy 5 ma i out i out _ recommend , v in = v out + 0.3 v to 4.2 v - 1. 9 +1. 9 % v out_load load regulation i out = 5 ma to i o ut_max 12 35 v/ma i lim v out current limit i out = 0 ma current limit , v out = 3.3 v , 2.7 v, v out drops by 2% 550 650 800 ma i out = 0 ma current limit , v out = 2.8 v , v out drops by 2% 275 323 400 i sd shutdown supply current v en = 0 v, v in = v out + 0.3 v to 4.2 v 0.125 1 .000 a v uvlo under - voltage lockout threshold rising v in 2.1 2.3 v v uvhys under - voltage lockout hysteresis 150 mv t start startup time rising en to 95% v out , i out = 1 0 ma 250 500 s tsd thermal shutdown rising temperature 150 c hysteresis 20 logic levels: en v ih enable high - level input voltage 1.05 v v il enable low - level input voltage 0.4 v i en input bias current v en = 1.8 v 0.04 1 .00 a notes: 9. guaranteed by design; not tested in production. 10. dropout voltage = v in - v outx when v out drops more than 100 mv below the nominal regulated v out level.
? 2014 fairchild semiconductor corporation www.fairchildsemi.com fan25800 ? rev. 1. 5 5 fan25800 500 ma, low - i q , low - noise , ldo regulator typical characteristics unless otherwise specified; v in = 3.6 v, v out = 3.3 v, t a = +25c, and test circuit per figure 1 . figure 5 . output regulation vs. load current and input voltage figure 6 output regulation vs. load current and temperature figure 7 . quiescent current vs. input voltage and temperature figure 8 . shutdown current vs. input voltage and temperature figure 9 . psrr vs. frequency, 10 ma load figure 10 . output noise voltage vs. frequency, 10 ma load
? 2014 fairchild semiconductor corporation www.fairchildsemi.com fan25800 ? rev. 1. 5 6 fan25800 500 ma, low - i q , low - noise , ldo regulator typical characteristics unless otherwise specified; v in = 3.6 v, v out = 3.3 v, t a = +25c, and test circuit per figure 1 . figure 11 . load transient, i out = 10 250 10 ma, v in =3.6 v , 400 ns edge figure 12 . line transient, v in = 4.0 3.6 4.0 v, 10 s transitions, 10 ma load figure 13 . line transient, v in = 4.0 3.6 4.0 v, 10 s transitions, 250 ma load figure 14 . startup, 10 ma load figure 15 . startup, 250 ma load
? 2014 fairchild semiconductor corporation www.fairchildsemi.com fan25800 ? rev. 1. 5 7 fan25800 500 ma, low - i q , low - noise , ldo regulator circuit description the fan25800 is a linear low - dropout (ldo) regulator that has high psrr and low output noise . the e nable control pin can be used to shut down the device and disconnect t he output load from the input. during shutdown, the supply current drops below 1 a. the ldo is d esigned to be stable with space - saving ceramic capacitors as small as 0201 case size. enable and soft - start when en is low, all circuits are off and the ic draws <550 na of current. the en pin does not have an internal pull - down resistor and must not be left floating. when en is high and v in is above the uvlo threshold, the regulator begins a soft - start cycle fo r the output. the soft - start cycle controls inrush current, limiting it to the i lim peak current limit. short - circuit and thermal protection the output current is short - circuit protected. when an output fault occurs, the output current is automatically lim ited to i lim and v out drops. the resultant v out is equal to i lim multiplied by the fault impedance. short - circuit fault or output overload may cause the die temperature to increase and exceed the maximum rating due to power dissipation . in such cases (dep ending upon the ambient temperature; the v in , load current, and thermal resistance ( jb ) of the mounted die), the device may enter thermal shutdown. if the die temperature exceeds the thermal shutdown temperature threshold, the onboard thermal protection d isables the output until the temperature drops below its hysteresis value. at that point, the output is re - enabled and a new soft - start sequence occurs. thermal considerations for best performance, the die temperature and the power dissipated should be kept at moderate values. the maximum power dissipated can be evaluated based on the following relationship: ( 1 ) where t j(max) is the maximum allowable junction temperature of the die; t a is the ambient operating temperature; and ja is dependent on the surrounding pcb layout and can be improved by providing a heat sink of surrounding copper ground. the addition of backside copper with through - holes, stiffeners, and other enhancements can help red uce ja . the heat contributed by the dissipation of devices nearby must be included in design considerations. capacitor selection an output capacitor with an effective capacitance between 400 nf and 1 5 f is required for loop stability. the esr value shoul d be within 3 to 1 00 m ? . dc bias characteristics of the capacitors must be considered when selecting the voltage rating and the case size of the capacitor. figure 16 is a typical derating curve for a 0201 case size, 1 .5 f, 6.3 v, x5r capacitor. figure 16 . capacitor dc bias characteristics typical application for post regulation due to its high psrr and low output noise, the fan25800 can be used as a post - dc - dc regulator to reduce output ripple and output noise at high efficiency for noise - sensitive applications. figure 17 shows a post - dc - dc regulation of the ldo with a buck converter. the capacitor on the output of the buck converter can be shared by the ldo as its input capacitor. figure 17 . ldo as post dc - dc regulator pcb layout recommendations capacitors should be placed as close to the ic as possible. all power and ground pins should be routed to their capacitors using top copper. the copper area connecting to the ic should be maximized to improve thermal performance. figure 18 . recommended layout ? ? ? ? ? ? ? ? ? ja a j d t t p (max) (max) d c - d c c o n v e r t e r f a n 2 5 8 0 0 e n e n l c 2 c 1 c 3 v i n v o u t 3 . 6 v 3 . 3 v 5 . 0 v v i n s w g n d g n d
? 2014 fairchild semiconductor corporation www.fairchildsemi.com fan25800 ? rev. 1. 5 8 fan25800 500 ma, low - i q , low - noise , ldo regulator product - specific dimensions d e x y 0.65 0.025 mm 0.65 0.025 mm 0.15 mm 0.15 mm
www. onsemi.com 1 on semiconductor and are trademarks of semiconductor components industries, llc dba on semiconductor or its subsidiaries i n the united states and/or other countries. on semiconductor owns the rights to a number of patents, trademarks, copyrights, trade secrets, and other intellectual property . a listing of on semiconductor?s product/patent coverage may be accessed at www.onsemi.com/site/pdf/patent ? marking.pdf . on semiconductor reserves the right to make changes without further notice to any products herein. on semiconductor makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does o n semiconductor assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including wi thout limitation special, consequential or incidental damages. buyer is responsible for its products and applications using on semiconductor products, including compliance with all laws, reg ulations and safety requirements or standards, regardless of any support or applications information provided by on semiconductor. ?typical? parameters which may be provided in on semiconductor data sheets and/or specifications can and do vary in dif ferent applications and actual performance may vary over time. all operating parameters, including ?typic als? must be validated for each customer application by customer?s technical experts. on semiconductor does not convey any license under its patent rights nor the right s of others. on semiconductor products are not designed, intended, or authorized for use as a critical component in life support systems or any fda class 3 medical devices or medical devices with a same or similar classification in a foreign jurisdiction or any devices intended for implantation in the human body. should buyer purchase or use on semicondu ctor products for any such unintended or unauthorized application, buyer shall indemnify and hold on semiconductor and its officers, employees, subsidiaries, affiliates, and distrib utors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim alleges that on semiconductor was negligent regarding the design or manufacture of the part. on semiconductor is an equal opportunity/affirmative action employer. this literature is subject to all applicable copyright laws and is not for resale in any manner. publication ordering information n. american technical support : 800 ? 282 ? 9855 toll free usa/canada europe, middle east and africa technical support: phone: 421 33 790 2910 japan customer focus center phone: 81 ? 3 ? 5817 ? 1050 www.onsemi.com literature fulfillment : literature distribution center for on semiconductor 19521 e. 32nd pkwy, aurora, colorado 80011 usa phone : 303 ? 675 ? 2175 or 800 ? 344 ? 3860 toll free usa/canada fax : 303 ? 675 ? 2176 or 800 ? 344 ? 3867 toll free usa/canada email : orderlit@onsemi.com on semiconductor website : www.onsemi.com order literature : http://www.onsemi.com/orderlit for additional information, please contact your local sales representative ? semiconductor components industries, llc
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