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fn7845 rev 3.00 page 1 of 12 december 20, 2012 fn7845 rev 3.00 december 20, 2012 isl9021a 250ma single ldo with low i q , low noise and high psrr ldo datasheet the isl9021a is a single ldo, which provides high performance, low input voltage and high psrr. it delivers guaranteed continuous 250ma load current and is stable with 1f to 4.7f of output capacitance (30%) with an esr range of 5m ? to 400m ? . the input voltage range for the isl9021a is between 1.5v to 5.5v and the output voltage comes in many fixed voltage options with 1.8% accuracy over-temperature, line and load ranges. the isl9021a has typical psrr of 75db @ 10khz and 50db @ 1mhz. the reverse current protection feature prevents current from flowing back to the power source when the output voltage is pulled higher than the input. the isl9021a is offered in tiny 4-bump 0.975mmx1.155mm wlcsp and 1.6mmx1.6mm 6 ld tdfn packages. related literature ?see fn6867 , isl9021 ?250ma single ldo with low iq, low noise and high psrr ldo? features ? high performance ldo with 250ma guaranteed continuous output current ? input voltage range: 1.5v to 5.5v ? output voltage range: 1.2v to 3.3v ? high psrr: 75db @ 10khz, 50db @ 1mhz ? low quiescent current: 35a ? dropout voltage: <150mv @ 250ma ? stable with 1f to 4.7f output capacitance (30%) with an esr range of 5m ? to 400m ? ? 1.8% output accuracy over-temperature/load/line ? soft-start limits input current surge during enable ? current limit and overheat protection ? -40c to +85c operating temperature range ? available in 0.975mmx1.15 5mm 4-bump wlcsp package and 1.6mmx1.6mm 6 ld tdfn ? pb-free (rohs compliant) applications ? pdas, cell phones and smart phones ? portable instruments, mp3 players ? handheld devices including medical handheld c1, c2: 1f x5r ceramic capacitor isl9021a vin gnd vo vin (1.5v to 5.5v) vout c1 c2 en enable off on figure 1. typical application
isl9021a fn7845 rev 3.00 page 2 of 12 december 20, 2012 block diagram pin configurations isl9021a (6 ld 1.6x1.6 tdfn) top view isl9021a (4 ball 0.975x1.155 wlcsp) top view pass element control logic short-circuit protection thermal protection soft-start temp sensor bandgap voltage and reference generator + vin en vout gnd 1 2 3 4 5 6 vin gnd nc vo nc en vin en gnd vout a1 b1 a2 b2 pin descriptions pin name tdfn pin # wlcsp pin # description vin 1 b1 ic supply/ldo input. connect a 1f capacitor to gnd. nc 2, 5 - no connect. gnd 4 a2 system ground pin. en 3 a1 ldo enable. when this signal goes high, the ldo is turned on. vo, vout 6 b2 ldo output. connect a 1f to 4.7f capacitor to gnd. pad - - for tdfn package option only. connect it to the system ground.
isl9021a fn7845 rev 3.00 page 3 of 12 december 20, 2012 ordering information part number (notes 1, 4) part marking v o voltage (v) temp range (c) package tape & reel (pb-free) pkg. dwg. # isl9021aiinz-t (note 2) 21an 3.3 -40c to +85c 4 ball 0.975x1.155 wlcsp w2x2.4 isl9021aiiuz-t (note 2) 21au 3.1 -40c to +85c 4 ball 0.975x1.155 wlcsp w2x2.4 isl9021aiimz-t (note 2) 21am 3.0 -40c to +85c 4 ball 0.975x1.155 wlcsp w2x2.4 isl9021aiikz-t (note 2) 21ak 2.85 -40c to +85c 4 ball 0.975x1.155 wlcsp w2x2.4 isl9021aiifz-t (note 2) 21af 2.5 -40c to +85c 4 ball 0.975x1.155 wlcsp w2x2.4 isl9021aiicz-t (note 2) 21ac 1.8 -40c to +85c 4 ball 0.975x1.155 wlcsp w2x2.4 isl9021aiibz-t (note 2) 21ab 1.5 -40c to +85c 4 ball 0.975x1.155 wlcsp w2x2.4 isl9021aiiwz-t (note 2) 21aw 1.2 -40c to +85c 4 ball 0.975x1.155 wlcsp w2x2.4 isl9021airunz-t (note 3) v6 3.3 -40c to +85c 6 ld tdfn l6.1.6x1.6 isl9021airunz-t7a (note 3) v6 3.3 -40c to +85c 6 ld tdfn l6.1.6x1.6 isl9021airumz-t (note 3) v5 3.0 -40c to +85c 6 ld tdfn l6.1.6x1.6 isl9021airumz-t7a (note 3) v5 3.0 -40c to +85c 6 ld tdfn l6.1.6x1.6 isl9021airukz-t (note 3) v4 2.85 -40c to +85c 6 ld tdfn l6.1.6x1.6 isl9021airukz-t7a (note 3) v4 2.85 -40c to +85c 6 ld tdfn l6.1.6x1.6 isl9021airujz-t (note 3) v3 2.8 -40c to +85c 6 ld tdfn l6.1.6x1.6 isl9021airujz-t7a (note 3) v3 2.8 -40c to +85c 6 ld tdfn l6.1.6x1.6 isl9021airufz-t (note 3) v2 2.5 -40c to +85c 6 ld tdfn l6.1.6x1.6 isl9021airufz-t7a (note 3) v2 2.5 -40c to +85c 6 ld tdfn l6.1.6x1.6 isl9021airucz-t (note 3) v1 1.8 -40c to +85c 6 ld tdfn l6.1.6x1.6 isl9021airucz-t7a (note 3) v1 1.8 -40c to +85c 6 ld tdfn l6.1.6x1.6 isl9021airubz-t (note 3) v0 1.5 -40c to +85c 6 ld tdfn l6.1.6x1.6 isl9021airubz-t7a (note 3) v0 1.5 -40c to +85c 6 ld tdfn l6.1.6x1.6 isl9021airuwz-t (note 3) v7 1.2 -40c to +85c 6 ld tdfn l6.1.6x1.6 isl9021airuwz-t7a (note 3) v7 1.2 -40c to +85c 6 ld tdfn l6.1.6x1.6 isl9021airuyz-t (note 3) v8 0.9 -40c to +85c 6 ld tdfn l6.1.6x1.6 isl9021airuyz-t7a (note 3) v8 0.9 -40c to +85c 6 ld tdfn l6.1.6x1.6 isl9021aiinz-evz evaluation board for isl9021aiinz isl9021aiiuz-evz evaluation board for isl9021aiiuz isl9021aiimz-evz evaluation board for isl9021aiimz isl9021aiikz-evz evaluation board for isl9021aiikz isl9021aiifz-evz evaluation board for isl9021aiifz ISL9021AIICZ-EVZ evaluation board for isl9021aiicz isl9021aiibz-evz evaluation board for isl9021aiibz isl9021aiiwz-evz evaluation board for isl9021aiiwz isl9021airunz-evz evaluatio n board for isl9021airunz isl9021airumz-evz evaluation board for isl9021airumz isl9021airukz-evz evaluation board for isl9021airukz isl9021airujz-evz evaluatio n board for isl9021airujz
isl9021a fn7845 rev 3.00 page 4 of 12 december 20, 2012 isl9021airufz-evz evaluation board for isl9021airufz isl9021airucz-evz evaluatio n board for isl9021airucz isl9021airubz-evz evaluation board for isl9021airubz isl9021airuwz-evz evaluation board for isl9021airuwz isl9021airuyz-evz evaluatio n board for isl9021airuyz notes: 1. please refer to tb347 for details on reel specifications. 2. these intersil pb-free wlcsp and bga packaged products employ special pb-free material sets; molding compounds/die attach mat erials and snagcu - e1 solder ball terminals, which are rohs compliant an d compatible with both snpb and pb-free soldering operations. int ersil pb-free wlcsp and bga packaged products are msl classified at pb-free pe ak reflow temperatures that meet or exceed the pb-free requirem ents of ipc/jedec j std-020. 3. these intersil pb-free plastic packaged products employ spec ial pb-free material sets; molding compounds/die attach materials and nipdau plate - e4 termination finish, which is rohs co mpliant and compatible with both snpb an d pb-free soldering operations. intersil pb-f ree products are msl classified at pb-free peak reflow temp eratures that meet or exceed the pb-fr ee requirements of ipc/jedec j std-020. 4. for moisture sensitivity level (msl), please see device information page for isl9021a . for more information on msl please see techbrief tb363 . ordering information (continued) part number (notes 1, 4) part marking v o voltage (v) temp range (c) package tape & reel (pb-free) pkg. dwg. #
isl9021a fn7845 rev 3.00 page 5 of 12 december 20, 2012 absolute maximum rating s thermal information supply voltage (vin) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +6.5v all other pins . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3 to (vin + 0.3)v recommended operating conditions ambient temperature range (t a ) . . . . . . . . . . . . . . . . . . . . -40c to +85c supply voltage (v in ) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.5 to 5.5v esd rating human body model. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5000v machine model . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 250v charged device model . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2200v latch-up passed at +85c . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100ma thermal resistance (typical) ? ja (c/w) ? jc (c/w) 4 ball wlcsp (note 5) . . . . . . . . . . . . . . . . . 135.64 n/a 6 lead tdfn (notes 6, 7) . . . . . . . . . . . . . 230 93 junction temperature range . . . . . . . . . . . . . . . . . . . . . . .-40c to +125c operating temperature range . . . . . . . . . . . . . . . . . . . . . . -40c to +85c storage temperature range. . . . . . . . . . . . . . . . . . . . . . . .-65c to +150c pb-free reflow profile . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . see link below http://www.intersil.com/ pbfree/pb-freereflow.asp caution: do not operate at or near the maximum ratings listed for extended periods of time. exposure to such conditions may adv ersely impact product reliability and result in failures not covered by warranty. notes: 5. ? ja is measured in free air with the componen t mounted on a high effective thermal conduc tivity test board with ?direct attach? fe atures. see tech brief tb379 . 6. ? ja is measured with the component mounted on a high effective thermal conductivity test board in free air. see tech brief tb379 for details. 7. for ? jc , the ?case temp? location is taken at the package top center. electrical specifications t a = -40c to +85c; v in = (v o + 0.5v) to 5.5v with a minimum v in of 1.5v; c in = 1f; c o = 1f. boldface limits apply over the operating temperature range, -40c to +85c. parameter symbol test conditions min (note 10) typ max (note 10) unit dc characteristics supply voltage v in 1.5 5.5 v v in undervoltage lockout threshold v uvlo+ v in rising 1.425 1.5 v v uvlo- v in falling 1.3 1.375 v ground current i dd output enabled; i o = 0; v in = 1.5v to 5.5v 35 50 a shutdown current i dds v in = 5.5v, en = low, i o = 0 0.1 1.0 a output voltage accuracy v in = v o + 0.5v to 5.5v, i o = 1ma to 250ma, t j = +25 c-0.8 +0.8% v in = v o + 0.5v to 5.5v, i o = 1ma to 250ma, t j = -40 c to +125 c -1.8 +1.8 % maximum output current i max continuous 250 ma internal current limit i lim 260 ma dropout voltage (notes 8, 9) v do i o = 250ma; v o > 1.8v 150 250 mv thermal shutdown temperature t sd 160 c thermal shutdown hysteresis 20 c ac characteristics ripple rejection (note 8) v in = 4.5v, v o = 3.3v @ 1khz 60 db v in = 4.5v, v o = 3.3v @ 10khz 75 db v in = 4.5v, v o = 3.3v @ 1mhz 50 db output noise voltage (note 8) v in = 4.2v, t a = +25 c, bw = 10hz to 100khz, i o = 10ma 8.5*v o v rms device start-up characteristics device enable time t en time from assertion of the en pin to when the output voltage reaches 95% of the v o (nom) 250 600 s ldo soft-start ramp rate t ssr slope of linear portion of ldo output voltage ramp during start-up 30 60 s/v
isl9021a fn7845 rev 3.00 page 6 of 12 december 20, 2012 en logic characteristics input low voltage v il 0.4 v input high voltage v ih 1.1 v input leakage current i il, i ih 0.1 a notes: 8. limits established by characteriza tion and are not production tested. 9. dropout voltage is measured as v in - v o , when v o is 4% lower than the value of v o 10. parameters with min and/or ma x limits are 100% tested at +25c, unless otherw ise specified. temperatur e limits established b y characterization and are not production tested. electrical specifications t a = -40c to +85c; v in = (v o + 0.5v) to 5.5v with a minimum v in of 1.5v; c in = 1f; c o = 1f. boldface limits apply over the operating temperature range, -40c to +85c. (continued) parameter symbol test conditions min (note 10) typ max (note 10) unit typical operating performance figure 2. quiescent current vs input voltage (v out = 0.9v) figure 3. quiescent current vs input voltage (v out = 1.85v) figure 4. quiescent current vs input voltage (v out = 3.3v) figure 5. load regulation vs temperature (v out = 1.85v) 0 5 10 15 20 25 30 35 40 45 1.52.53.54.55.5 input voltage (v) quiescent current (a) t = +85c t = +45c t = room temp t = 0c t = -25c t = -40c 0 5 10 15 20 25 30 35 40 45 1.5 2.5 3.5 4.5 5.5 input voltage (v) quiescent current (a) t = +85c t = room temp t = 0c t = -25c t = -40c t = +45c -10 0 10 20 30 40 50 3.5 4.0 4.5 5.0 5.5 6.0 input voltage (v) quiescent current (a) t = +85c t = +45c t = 0c t = -25c t = -40c t = room temp 1.60 1.65 1.70 1.75 1.80 1.85 1.90 1.95 0 50 100 150 200 250 300 io (ma) vo (v) -40c +25c +85c
isl9021a fn7845 rev 3.00 page 7 of 12 december 20, 2012 figure 6. line regulation vs temperature (v out = 1.85v) figure 7. load regulation vs temperature (v out =3.3v) figure 8. line regulation vs temperature (v out =3.3v) figure 9. load regulation vs temperature (v out =0.9v) figure 10. line regulation vs temperature (v out =0.9v) figure 11. load transient response typical operating performance (continued) 1.50 1.55 1.60 1.65 1.70 1.75 1.80 1.85 1.90 1.95 2.00 2.53.54.55.56.5 v in (v) vo (v) -40c +25c +85c 2.8 2.9 3.0 3.1 3.2 3.3 3.4 3.5 0 50 100 150 200 250 300 io (ma) vo (v) -40c +25c +85c 3.00 3.05 3.10 3.15 3.20 3.25 3.30 3.35 3.40 3.45 3.50 3.5 4.0 4.5 5.0 5.5 6.0 v in (v) vo (v) -40c +25c +85c 0.60 0.65 0.70 0.75 0.80 0.85 0.90 0.95 1.00 1.05 0 50 100 150 200 250 300 io (ma) vo (v) -40c +25c +85c 0.70 0.75 0.80 0.85 0.90 0.95 1.00 3.0 3.5 4.0 4.5 5.0 5.5 6.0 v in (v) vo (v) -40c +25c +85c v out = 1.85v i out = 1ma to 250ma v out i out v in = 2.7v c out = 1f
isl9021a fn7845 rev 3.00 page 8 of 12 december 20, 2012 figure 12. load transient response figure 13. enable function (v in = 3.6v, v out = 1.85v, c out 1f) figure 14. power supply rejection vs frequency typical operating performance (continued) v out = 1.85v i out = 1ma to 250ma v out i out v in = 2.7v c out = 4.7f -90 -80 -70 -60 -50 -40 -30 -20 100 1k 10k 100k 1m frequency (hz) psrr (db) v in = 4.5vdc + 50mvac c out = 1f i o = 0a i o = 10ma
isl9021a fn7845 rev 3.00 page 9 of 12 december 20, 2012 functional description the isl9021a is a high performa nce low-dropout regulator (ldo) with 250ma sourcing capability. the extra low ground current makes this part a good choice for handheld product applications. the device also incorporates overcurrent, thermal shutdown, reverse current protections, and soft-start features. thermal shutdown protects the device against overheating. soft-start limits the start-up input current surges. in some applications, the output voltage may be externally pulled higher than the input, or the input volt age could be connected to ground, or connected to some voltage lower than the output side. the isl9021a features reverse current protection; that can block the reverse current from output to input. enable control the isl9021a has an enable pin. when en is low, the ic is in shutdown mode. in this condition, all on-chip circuits are off, and the device draws minimum current, typically less than 0.1a(typ). driving this pin high will turn on the device. ldo protections the isl9021a offers several protecti on functions, making it ideal for use in battery-powered applications. the isl9021a provides short-circuit protection by limiting the output current at current limit of 260ma (min). if the short ci rcuit lasts long enough, the die temperature increases, and the over-temperature protection circuit will shut down the output. when the die temperature reaches about +145c, thermal protection starts to work with output being loaded with at least 50ma. once the die temperature drops to about +110c, the ldo will resume operation beginning with a soft-start. the isl9021a?s reverse current protection is intended to block reverse conduction if output voltage is higher than input voltage. input and output capacitors the isl9021a provides a linear regulator that has low quiescent current, fast transient response , and overall stable operation across the recommended operating conditions. a ceramic capacitor (x5r or x7r) with a capacitance of 1f to 4.7f with an esr up to 400m ? is suitable for the isl9021a to maintain its output stability. the ground co nnection of the output capacitor should be routed directly to the gnd pin of the device, and also placed close to the ic. similarly for the input capacitor, usually a 1f ceramic capacitor (x5r or 7r) is suitable for most cases, but if a large, fast rising load transient condition is expected, a higher value input capacitor may be necessary to achieve satisfactory performance. board layout recommendations a good pcb layout is an important step to achieve good performance. it is recommended to design the board with separate ground planes for input and output, and connect both ground planes at the gnd pin of the ic. consideration should be taken when placing the components and routing the trace to minimize the ground impedance, and keep the parasitic inductance low. usually the inpu t/output capacitors should be placed as close to the ic as possible with a good ground connection.
fn7845 rev 3.00 page 10 of 12 december 20, 2012 isl9021a intersil products are manufactured, assembled and tested utilizing iso9001 quality systems as noted in the quality certifications found at www.intersil.com/en/suppor t/qualandreliability.html intersil products are sold by description on ly. intersil may modify the circuit design an d/or specifications of products at any time without notice, provided that such modification does not, in intersil's sole judgment, affect the form, fit or function of the product. accordingly, the reader is cautioned to verify that datasheets are current before placing orders. information fu rnished by intersil is believed to be accu rate and reliable. however, no responsib ility is assumed by intersil or its subsidiaries for its use; nor for any infrin gements of patents or other rights of third parties which may result from its use. no license is granted by implication or otherwise under any patent or patent rights of intersil or its subsidiaries. for information regarding intersil corporation and its products, see www.intersil.com for additional products, see www.intersil.com/en/products.html ? copyright intersil americas llc 2011-2012. all rights reserved. all trademarks and registered trademarks are the property of their respective owners. about intersil intersil corporation is a leader in the design and manufacture of high-performance analog, mixed-signal and power management semiconductors. the company's products addr ess some of the fastest growing markets wi thin the industrial and infrastructure, personal computing and high-end consumer markets. for more inform ation about intersil or to find out how to become a member of our winning team, visit our website and career page at www.intersil.com . for a complete listing of applications, re lated documentation and related parts, plea se see the respective product information page. also, please check the product information page to ensure that you have the most updated datasheet: isl9021a to report errors or suggestions for this datasheet, please go to: www.intersil.com/askourstaff reliability reports are available from our website at: http://rel.intersil.com/reports/search.php revision history the revision history provided is for informational purposes only and is believed to be accurate, but not warranted. please go t o web to make sure you have the latest revision. date revision change december 17, 2012 fn7845.3 added evaluation boards and isl9021aiiuz-t to ?ordering information? on page 3. december 2, 2011 fn7845.2 changed csp package dimension from ?2mmx2mm? to ?0.975mmx1.155mm? on page 1 to page 3. october 7, 2011 fn7845.1 updated ?ordering information? on page 3 by adding isl9021airuyz-t and isl9021airuyz-t7a parts. made corrections to part markings and added -t7a parts. may 27, 2011 fn7845.0 initial release
isl9021a fn7845 rev 3.00 page 11 of 12 december 20, 2012 package outline drawing l6.1.6x1.6 6 lead ultra thin dual flat no-l ead col plastic package (utdfn col) rev 1, 11/07 typical recommended land pattern detail "x" top view bottom view side view located within the zone indica ted. the pin #1 i dentifier may be unless otherwise specified, t olerance : decimal 0.05 tiebar shown (if present) is a non-functional feature. the configuration of t he pin #1 identifier is optional, but mus t be between 0.15mm and 0.30mm from the terminal tip. dimension b applies to the meta llized terminal and is measured dimensions in ( ) for reference only. dimensioning and tolerancing conform to amse y14.5m-1994. 6. either a mold or mark feature. 3. 5. 4. 2. dimensions are in millimeters. 1. notes: 1.60 5x 0 . 40 0 . 1 0.15 ( 1 . 4 ) (4x) ( 6x 0 . 25 ) ( 1x 0 .70 ) ( 4x 0 . 5 ) 0 . 55 max base plane c seating plane 0.08 c 0.10 c 0.25 +0.05 / -0.07 see detail "x" 0.10 4 ca mb index area 6 pin 1 1.60 a b pin #1 index area 0.50 2x 1.00 4x 6 ( 5x 0 . 60 ) 0 . 00 min. 0 . 05 max. c 0 . 2 ref 4 3 6 1 1x 0.5 0.1
isl9021a fn7845 rev 3.00 page 12 of 12 december 20, 2012 wafer level chip scale package (wlcsp 0.4mm ball pitch) side view top view bottom view pin 1 e d a2 b a1 e ( e1 ) se e ( d1 ) 2 b a b sd a 1 w2x2.4 2x2 array 4 ball wafer level chip scale package symbol millimeters a 0.44 min, 0.495 nom, 0.55 max a1 0.190 0.030 a2 0.305 0.025 b 0.270 0.030 d 1.155 0.020 d1 0.400 basic e 0.975 0.020 e1 0.400 basic e 0.400 basic sd 0.200 basic se 0.00 basic number of bumps: 4 rev. 2 6/08 notes: 1. all dimensions are in millimeters.

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